1. A method for acquiring a stroke curve of a circuit breaker operating mechanism is characterized by comprising the following steps:

step A: building an assembly model of the circuit breaker operating mechanism;

and B: introducing the assembly body model into ADAMS to obtain a multi-body dynamic model, and setting parameters of parts in the multi-body dynamic model and constraint relations among the parts in the ADAMS;

and C: setting the sizes of springs and friction acting force in the multi-body dynamic model, and performing simulation;

step D: and setting an observation point, and acquiring a stroke curve and a speed curve of the multi-body dynamic model of the operating mechanism.

2. The method for acquiring the stroke curve of the circuit breaker operating mechanism according to claim 1, wherein the step a specifically comprises:

a1: determining the thickness, the length, the radius, the angle and the width of each part according to a design drawing of a circuit breaker operating mechanism;

a2: constructing a three-dimensional model of each part based on the data acquired in the step A1;

a3: and assembling the three-dimensional models of the parts together according to the positions of the parts in the design drawing of the circuit breaker operating mechanism to form an assembly body model.

3. The method for acquiring the stroke curve of the circuit breaker operating mechanism according to claim 1, wherein the step B comprises the following steps:

b1: the density of all parts in the multi-body dynamic model was set to 7.85 × 10^-6kg·mm^-3；

B2: arranging kinematic pairs on the multi-body dynamic model parts;

b3: and setting collision, spring and friction acting force in the multi-body dynamic model.

4. The method for acquiring the stroke curve of the circuit breaker operating mechanism according to claim 3, wherein the step B2 specifically comprises:

arranging a rotary pair R1, respectively selecting a geometric center point and an interface blank of the operating shaft, and placing the rotary pair at the geometric center point of the operating shaft;

arranging a rotating pair R2, respectively selecting a geometric center point and an interface blank of the energy storage shaft, and placing the rotating pair at the geometric center point of the energy storage shaft;

setting a rotating pair R3, respectively selecting a rotating central point of the closing holding pawl and an interface blank, and placing the rotating pair at the rotating central point of the closing holding pawl;

arranging a rotary pair R4, respectively selecting the geometric center points of the operating shaft and the output crank arm, and placing the rotary pair at the geometric center point of the operating shaft;

arranging a rotary pair R5, respectively selecting the geometric center points of the operating shaft and the large crank arm, and placing the rotary pair at the geometric center point of the operating shaft;

arranging a rotating pair R6, respectively selecting the geometric center points of the energy storage shaft and the cam, and placing the rotating pair at the geometric center point of the energy storage shaft;

arranging a rotating pair R7, respectively selecting the geometric center points of the operating shaft and the ratchet wheel, and placing the rotating pair at the geometric center point of the ratchet wheel;

arranging a rotary pair R8, respectively selecting geometric central points of a closing transmission rod and a ratchet wheel, and placing the rotary pair at the central point of an arc-shaped part of the closing transmission rod;

arranging a rotary pair R9, respectively selecting the geometric central points of the opening transmission rod and the output crank arm, and placing the rotary pair at the central point on the right side of the output crank arm;

arranging a revolute pair R10, respectively selecting the geometric center points of the large crank arm and the roller, and placing the revolute pair at the geometric center point of the roller;

arranging a rotary pair R11, respectively selecting the geometric center points of the output crank arm and the transmission rod, and placing the rotary pair at the center point of the left side of the output crank arm;

arranging a rotating pair R12, respectively selecting the geometric central points of the transmission rod and the crank arm, and placing the rotating pair at the central point of the upper part of the transmission rod;

arranging a rotating pair R13, respectively selecting the geometric center points of the crank arm and the linkage plate, and placing the rotating pair at the geometric center point of the linkage plate;

setting a moving pair T1, respectively selecting a placing point of a closing spring at the tail end of a closing transmission rod and a blank position of an interface, placing the moving pair on the placing point of the closing spring, and simultaneously setting the direction of the moving pair to be the same as the direction of gravity in an ADAMS interface;

setting a sliding pair T2, respectively selecting a brake separating spring placing point and an interface blank at the tail end of a brake separating transmission rod, placing the sliding pair on the brake separating spring placing point, and simultaneously setting the direction of the sliding pair to be the same as the direction of gravity in an ADAMS interface;

arranging a fixed pair F1, respectively selecting the geometric center points of the ratchet wheel and the energy storage shaft, and placing the fixed pair at the geometric center of the energy storage shaft;

arranging a fixed pair F2, respectively selecting the geometric center points of the energy storage shaft and the cam, and placing the fixed pair at the geometric center point of the energy storage shaft;

setting a fixed pair F3, respectively selecting the geometric center points of the large crank arm and the operating shaft, and placing the fixed pair at the geometric center point of the operating shaft;

and arranging a fixed pair F4, respectively selecting the geometric center points of the output crank arm and the operating shaft, and placing the fixed pair at the geometric center point of the operating shaft.

5. The method for acquiring the stroke curve of the circuit breaker operating mechanism according to claim 3, wherein the step B3 comprises:

selecting a collision module Contact1 in the ADAMS software action force column, and then respectively selecting the outer surfaces of the large crank arm and the closing holding pawl to finish the setting of collision action force;

selecting a collision module Contact2 in the ADAMS software action force column, and then respectively selecting the outer surfaces of the cam and the roller to complete the setting of collision action force;

selecting a Spring module Spring1 in the ADAMS software acting force column, and then respectively selecting a placing point of a closing Spring and an interface blank right above the placing point to construct a closing Spring;

and selecting a Spring module Spring2 in the column of the acting force of the ADAMS software, and then respectively selecting a placing point of the opening Spring and a blank of an interface right above the placing point to construct the opening Spring.

6. The method for acquiring the stroke curve of the circuit breaker operating mechanism according to claim 1, wherein the step C specifically comprises:

c1: obtaining the wire diameter d of a closing spring and a separating spring in a real object of a circuit breaker operating mechanism₁、d₂Outer diameter D₁、D₂Total number of turns N of spring₁、N₂(ii) a Height l of closing spring in free state, height h of stored energy state, and height l of opening spring in free state₀Height x in the pre-compressed state;

c2: calculating the stiffness coefficient k of the closing spring and the opening spring by using the data obtained in the step C1₁、k₂And pressure F applied to the closing spring and the opening spring₁、F₂：

N_c1＝N₁-2；D_m1＝D₁-d₁；G＝210GPa

N_c2＝N₂-2；D_m2＝D₂-d₂；G＝210GPa

F₁＝k₁·(l-h)

F₂＝k₂·(l₀-x)

C3: the rotating pairs R1 and R2 in the multi-body dynamic model are used for rolling bearings arranged on an operating shaft and an energy storage shaft in actual equipment of an equivalent operating mechanism; setting the dynamic friction coefficient of all the rotating pairs except the rotating pairs R1 and R2 in the multi-body dynamic model to be 0.1 and setting the static friction coefficient to be 0.12;

c4: setting the dynamic friction coefficients of the rotating pairs R1 and R2 to be 0.0035 and the static friction coefficient to be 0.0040;

c5: setting parameters of a Simulation Control module in ADAMS as follows: the simulation end time is 0.1s, and the simulation steps are 100 steps.

7. The method for acquiring the stroke curve of the circuit breaker operating mechanism according to claim 1, wherein the step D specifically comprises:

d1: selecting a Marker point in a Construction column in ADAMS software, and fixing the Marker point at the tail end of the crank arm;

d2: after fixing the Marker point, selecting the Measure option of the point, selecting the relational displacement in the Characteriostic column, and then clicking 'Y' in the Component column; and named displacement;

d3: selecting the Measure option of the Marker point again, selecting the relational coordinate in the Characteriostic column, and then clicking 'Y' in the Component column; and is named as velocity;

d4: carrying out simulation calculation on a multi-body dynamic model of the operating mechanism to obtain a stroke and speed curve of the operating mechanism;

d5: and after the calculation is finished, selecting a Postprocessor module in a Result column in the ADAMS, and respectively selecting displacement and velocity in a Measure column of the module to obtain a stroke curve and a speed curve of the operating mechanism.

8. The method for acquiring the stroke curve of the circuit breaker operating mechanism according to any one of claims 1 to 7, further comprising:

step E: verifying the stroke curve of the operating mechanism, and if the deviation of the stroke curve and the actually measured value is less than a preset value, conforming to the requirement; otherwise, modifying the dynamic friction coefficients of the revolute pairs R1 and R2 in the multi-body dynamic model, and re-acquiring the stroke curve until the stroke curve meets the requirements; the rotating pairs R1 and R2 in the multi-body dynamic model are used for rolling bearings mounted on an operating shaft and an energy storage shaft in actual equipment of an equivalent operating mechanism.

9. The method for acquiring the stroke curve of the circuit breaker operating mechanism according to claim 8, wherein the step E specifically comprises:

e1: extracting the peak value X of the travel curve_pAnd its corresponding time t_pMoving contact motion time t and peak value v of speed curve_pAnd the corresponding time v_t；

E2: acquiring measured values of the five physical quantities in the step E1;

e3: comparing the five physical quantity values extracted in the step E1 with the actual measurement results of the corresponding five physical quantities in the step E2, and calculating respective deviations of the five physical quantities:

e4: if the absolute values of the deviation of the five physical quantities in the step E3 are all within 20%, the stroke curve of the operating mechanism meets the requirement; otherwise, modifying the dynamic friction coefficients of the revolute pairs R1 and R2 in the multi-body dynamic model, and acquiring the stroke curve again until the deviation of the five physical quantities in the step E3 is less than 20%.

Background

The circuit breaker is important switchgear in a power supply system, and can timely isolate a fault line besides opening and closing the line, so that the accident range is prevented from being further expanded, and the reliable operation of the system is guaranteed. If the breaker has the faults of not-in-place opening and closing or misoperation, refusal action and the like, the line is temporarily powered off if the breaker is in a light state, the stability of the system is endangered if the breaker is in a heavy state, more serious power failure accidents are induced, and huge economic loss is generated. Therefore, in consideration of the important role of the circuit breaker in the power supply system, it is necessary to perform fault diagnosis on the circuit breaker.

According to data statistics, the percentage of mechanical faults in all the faults of the circuit breaker is the highest and can reach 70%. According to the field report, the faults of jamming of the operating mechanism, loosening of the spring, loosening of the fastening screw and breakage of the mechanism are the most common in all mechanical faults. It is therefore necessary to investigate these faults and extract the characteristics of them. The travel curve of the circuit breaker operating mechanism contains rich information from which the characteristic quantities required for diagnosing the above-mentioned several faults can be obtained. However, it is difficult to obtain the stroke curve of the circuit breaker operating mechanism, on one hand, the real object of the circuit breaker is difficult to obtain, and on the other hand, the problems of difficult matching, difficult installation and the like exist because the displacement sensor for collecting the stroke curve is influenced by the model of the circuit breaker and the structure of the operating mechanism.

Disclosure of Invention

The invention provides a method for acquiring a stroke curve of a circuit breaker operating mechanism, which aims to solve the problem that the prior art is difficult to acquire the stroke curve of the circuit breaker operating mechanism.

A method for acquiring a stroke curve of a circuit breaker operating mechanism comprises the following steps:

step A: building an assembly model of the circuit breaker operating mechanism;

and B: introducing the assembly body model into ADAMS to obtain a multi-body dynamic model, and setting parameters of parts in the multi-body dynamic model and constraint relations among the parts in the ADAMS;

and C: setting the sizes of springs and friction acting force in the multi-body dynamic model, and performing simulation;

step D: and setting an observation point, and acquiring a stroke curve and a speed curve of the multi-body dynamic model of the operating mechanism.

Further, the step a specifically includes:

a1: determining the thickness, the length, the radius, the angle and the width of each part according to a design drawing of a circuit breaker operating mechanism;

a2: constructing a three-dimensional model of each part based on the data acquired in the step A1;

a3: and assembling the three-dimensional models of the parts together according to the positions of the parts in the design drawing of the circuit breaker operating mechanism to form an assembly body model.

Further, the step B includes:

b1: the density of all parts in the multi-body dynamic model was set to 7.85 × 10^-6kg·mm^-3；

B2: arranging kinematic pairs on the multi-body dynamic model parts;

b3: and setting collision, spring and friction acting force in the multi-body dynamic model.

Further, the step B2 specifically includes:

arranging a rotary pair R1, respectively selecting a geometric center point and an interface blank of the operating shaft, and placing the rotary pair at the geometric center point of the operating shaft;

arranging a rotating pair R2, respectively selecting a geometric center point and an interface blank of the energy storage shaft, and placing the rotating pair at the geometric center point of the energy storage shaft;

setting a rotating pair R3, respectively selecting a rotating central point of the closing holding pawl and an interface blank, and placing the rotating pair at the rotating central point of the closing holding pawl;

arranging a rotary pair R4, respectively selecting the geometric center points of the operating shaft and the output crank arm, and placing the rotary pair at the geometric center point of the operating shaft;

arranging a rotary pair R5, respectively selecting the geometric center points of the operating shaft and the large crank arm, and placing the rotary pair at the geometric center point of the operating shaft;

arranging a rotating pair R6, respectively selecting the geometric center points of the energy storage shaft and the cam, and placing the rotating pair at the geometric center point of the energy storage shaft;

arranging a rotating pair R7, respectively selecting the geometric center points of the operating shaft and the ratchet wheel, and placing the rotating pair at the geometric center point of the ratchet wheel;

arranging a rotary pair R8, respectively selecting geometric central points of a closing transmission rod and a ratchet wheel, and placing the rotary pair at the central point of an arc-shaped part of the closing transmission rod;

arranging a rotary pair R9, respectively selecting the geometric central points of the opening transmission rod and the output crank arm, and placing the rotary pair at the central point on the right side of the output crank arm;

arranging a revolute pair R10, respectively selecting the geometric center points of the large crank arm and the roller, and placing the revolute pair at the geometric center point of the roller;

arranging a rotary pair R11, respectively selecting the geometric center points of the output crank arm and the transmission rod, and placing the rotary pair at the center point of the left side of the output crank arm;

arranging a rotating pair R12, respectively selecting the geometric central points of the transmission rod and the crank arm, and placing the rotating pair at the central point of the upper part of the transmission rod;

arranging a rotating pair R13, respectively selecting the geometric center points of the crank arm and the linkage plate, and placing the rotating pair at the geometric center point of the linkage plate;

setting a moving pair T1, respectively selecting a placing point of a closing spring at the tail end of a closing transmission rod and a blank position of an interface, placing the moving pair on the placing point of the closing spring, and simultaneously setting the direction of the moving pair to be the same as the direction of gravity in an ADAMS interface;

setting a sliding pair T2, respectively selecting a brake separating spring placing point and an interface blank at the tail end of a brake separating transmission rod, placing the sliding pair on the brake separating spring placing point, and simultaneously setting the direction of the sliding pair to be the same as the direction of gravity in an ADAMS interface;

arranging a fixed pair F1, respectively selecting the geometric center points of the ratchet wheel and the energy storage shaft, and placing the fixed pair at the geometric center of the energy storage shaft;

arranging a fixed pair F2, respectively selecting the geometric center points of the energy storage shaft and the cam, and placing the fixed pair at the geometric center point of the energy storage shaft;

setting a fixed pair F3, respectively selecting the geometric center points of the large crank arm and the operating shaft, and placing the fixed pair at the geometric center point of the operating shaft;

and arranging a fixed pair F4, respectively selecting the geometric center points of the output crank arm and the operating shaft, and placing the fixed pair at the geometric center point of the operating shaft.

Further, the step B3 includes:

selecting a collision module Contact1 in the ADAMS software action force column, and then respectively selecting the outer surfaces of the large crank arm and the closing holding pawl to finish the setting of collision action force;

selecting a collision module Contact2 in the ADAMS software action force column, and then respectively selecting the outer surfaces of the cam and the roller to complete the setting of collision action force;

selecting a Spring module Spring1 in the ADAMS software acting force column, and then respectively selecting a placing point of a closing Spring and an interface blank right above the placing point to construct a closing Spring;

and selecting a Spring module Spring2 in the column of the acting force of the ADAMS software, and then respectively selecting a placing point of the opening Spring and a blank of an interface right above the placing point to construct the opening Spring.

Further, the step C specifically includes:

c1: obtaining the wire diameter d of a closing spring and a separating spring in a real object of a circuit breaker operating mechanism₁、d₂Outer diameter D₁、D₂Total number of turns N of spring₁、N₂(ii) a Height l of closing spring in free state, height h of stored energy state, and height l of opening spring in free state₀Height x in the pre-compressed state;

c2: calculating the stiffness coefficient k of the closing spring and the opening spring by using the data obtained in the step C1₁、k₂And pressure F applied to the closing spring and the opening spring₁、F₂：

N_c1＝N₁-2；D_m1＝D₁-d₁；G＝210GPa

N_c2＝N₂-2；D_m2＝D₂-d₂；G＝210GPa

F₁＝k₁·(l-h)

F₂＝k₂·(l₀-x)

C3: the rotating pairs R1 and R2 in the multi-body dynamic model are used for rolling bearings arranged on an operating shaft and an energy storage shaft in actual equipment of an equivalent operating mechanism; setting the dynamic friction coefficient of all the rotating pairs except the rotating pairs R1 and R2 in the multi-body dynamic model to be 0.1 and setting the static friction coefficient to be 0.12;

c4: setting the dynamic friction coefficients of the rotating pairs R1 and R2 to be 0.0035 and the static friction coefficient to be 0.0040;

c5: setting parameters of a Simulation Control module in ADAMS as follows: the simulation end time is 0.1s, and the simulation steps are 100 steps.

Further, the step D specifically includes:

d1: selecting a Marker point in a Construction column in ADAMS software, and fixing the Marker point at the tail end of the crank arm;

d2: after fixing the Marker point, selecting the Measure option of the point, selecting the relational displacement in the Characteriostic column, and then clicking 'Y' in the Component column; and named displacement;

d3: selecting the Measure option of the Marker point again, selecting the relational coordinate in the Characteriostic column, and then clicking 'Y' in the Component column; and is named as velocity;

d4: carrying out simulation calculation on a multi-body dynamic model of the operating mechanism to obtain a stroke and speed curve of the operating mechanism;

d5: and after the calculation is finished, selecting a Postprocessor module in a Result column in the ADAMS, and respectively selecting displacement and velocity in a Measure column of the module to obtain a stroke curve and a speed curve of the operating mechanism.

Further, still include:

step E: verifying the stroke curve of the operating mechanism, and if the deviation of the stroke curve and the actually measured value is less than a preset value, conforming to the requirement; otherwise, modifying the dynamic friction coefficients of the revolute pairs R1 and R2 in the multi-body dynamic model, and re-acquiring the stroke curve until the stroke curve meets the requirements; the rotating pairs R1 and R2 in the multi-body dynamic model are used for rolling bearings mounted on an operating shaft and an energy storage shaft in actual equipment of an equivalent operating mechanism.

Further, the step E specifically includes:

e1: extracting the peak value X of the travel curve_pAnd its corresponding time t_pMoving contact motion time t and peak value v of speed curve_pAnd the corresponding time v_t；

E2: acquiring measured values of the five physical quantities in the step E1;

e3: comparing the five physical quantity values extracted in the step E1 with the actual measurement results of the corresponding five physical quantities in the step E2, and calculating respective deviations of the five physical quantities:

e4: if the absolute values of the deviation of the five physical quantities in the step E3 are all within 20%, the stroke curve of the operating mechanism meets the requirement; otherwise, modifying the dynamic friction coefficients of the revolute pairs R1 and R2 in the multi-body dynamic model, and acquiring the stroke curve again until the deviation of the five physical quantities in the step E3 is less than 20%.

Advantageous effects

The invention provides a method for acquiring a stroke curve of a circuit breaker operating mechanism, which has the following advantages:

1. according to the invention, a method for setting important mechanism parameters in the model is provided according to the sizes of the opening spring and the closing spring in the equipment, the lengths of the opening spring and the closing spring in different states, the material quality of parts in the mechanism and other information, so that the model is closer to a real object, is more reasonably built, and is convenient for accurately obtaining a stroke curve meeting requirements;

2. the invention can solve a series of problems of difficult setting of friction coefficient between mechanisms, limited experimental site, difficult acquisition of equipment, difficult installation of sensors and the like, and simply and accurately acquire a stroke curve;

3. the multi-body dynamic model obtained based on the method can provide a basis for researches such as diagnosis of mechanical faults of the circuit breaker, mechanism optimization and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an assembly model of a spring operating mechanism according to an embodiment of the present invention;

fig. 2 is a schematic position diagram of the end points of the crank arm, the large crank arm, the output crank arm, the transmission rod, the opening transmission rod and the closing transmission rod provided by the embodiment of the invention;

fig. 3 is a flowchart of a method for acquiring a stroke curve of a circuit breaker operating mechanism according to an embodiment of the present invention;

fig. 4 is a travel curve and a speed variation curve provided by the embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

As shown in fig. 1 to 4, the present invention provides a method for obtaining a stroke curve of a circuit breaker operating mechanism, including:

step A: and building an assembling body model of the circuit breaker operating mechanism in Solidworks software. The method specifically comprises the following steps:

a1: and determining the thickness, the length, the radius, the angle and the width of each part according to a design drawing of the circuit breaker operating mechanism.

A2: utilizing Solidworks software to construct a three-dimensional model of each part, and then sequentially storing all constructed three-dimensional models in an SLDPRT format, wherein the method specifically comprises the following steps:

building a three-dimensional model of the cam 10 by utilizing Solidworks software according to the thickness of the cam 10 in the spring operating mechanism of the circuit breaker and the radius of the cam at different angles;

building a three-dimensional model of the linkage plate 1 by utilizing Solidworks software according to the length of the linkage plate 1 and the radius of a cylinder in the spring operating mechanism of the circuit breaker;

building a three-dimensional model of the output connecting lever 4 by utilizing Solidworks software according to the thickness, the radius and the radian of the arc-shaped part of the output connecting lever 4 in the spring operating mechanism of the circuit breaker;

building a three-dimensional model of the large crank arm 7 by utilizing Solidworks software according to the length, the width and the thickness of the large crank arm 7 in the spring operating mechanism of the circuit breaker and the radius and the angle of the arc part;

building a three-dimensional model of the roller 9 by utilizing Solidworks software according to the radius and the thickness of the roller 9 in the spring operating mechanism of the circuit breaker;

building a three-dimensional model of the closing holding pawl 8 by utilizing Solidworks software according to the length, the width and the thickness of the closing holding pawl 8 and the radius and the angle of an arc-shaped part in a spring operating mechanism of the circuit breaker;

building a three-dimensional model of the closing transmission rod 13 by utilizing Solidworks software according to the length, the thickness, the radius and the angle of the arc-shaped part of the closing transmission rod 13 in the spring operating mechanism of the circuit breaker;

building a three-dimensional model of the switching-on transmission rod 5 by utilizing Solidworks software according to the total length, the cylinder length and the cylinder radius of the switching-off transmission rod 5 in the spring operating mechanism of the circuit breaker;

building a three-dimensional model of the transmission rod 3 by utilizing Solidworks software according to the total length, the cylinder length and the cylinder radius of the transmission rod 3 in the spring operating mechanism of the circuit breaker;

building a three-dimensional model of the ratchet wheel 12 by utilizing Solidworks software according to the radius and the thickness of the ratchet wheel 12 in the spring operating mechanism of the circuit breaker and the number of pawls on the ratchet wheel;

building a three-dimensional model of the crank arm 2 by utilizing Solidworks software according to the total length, the thickness and the radius and the angle of the arc-shaped part of the crank arm 2 in the spring operating mechanism of the circuit breaker;

building a three-dimensional model of the operating shaft 6 by utilizing Solidworks software according to the length and the radius of the operating shaft 6 in the spring operating mechanism of the circuit breaker;

building a three-dimensional model of the energy storage shaft 11 by utilizing Solidworks software according to the length and the radius of the energy storage shaft 11 in the spring operating mechanism of the circuit breaker;

and sequentially storing all the built three-dimensional models in an SLDPRT format.

A3: and assembling the three-dimensional models of the parts led into the Solidworks assembly interface together according to the positions of the parts in the design drawing of the circuit breaker operating mechanism to form an assembly body model. The method specifically comprises the following steps:

the three-dimensional models of all parts stored in the SLDPRT format in A2 are all imported into an assembly interface of Solidworks;

fixing an operating shaft on the assembly interface, and setting the front view of the assembly interface as a reference plane, the central axis of the operating shaft as a reference line and the geometric center point of the operating shaft as a reference point;

setting the central axis of the energy storage shaft 11 to be parallel to the reference line, and then fixing the energy storage shaft 11 in an assembly interface according to the distance between the central axis of the energy storage shaft 11 and the reference line, the height from the geometric central point of the energy storage shaft 11 to the vertical direction of the reference plane and the linear distance from the geometric central point of the energy storage shaft 11 to the reference point;

the method comprises the following steps that a coaxial constraint module in Solidworks is used, a cam 10 and an energy storage shaft 11, a ratchet 12 and the energy storage shaft 11 are respectively selected, and the cam 10 and the ratchet 12 are respectively placed on the energy storage shaft 11; then modifying the positions of the cam 10 and the ratchet wheel 12 on the energy storage shaft 11 according to the linear distance from the geometric center point of the cam 10 and the ratchet wheel 12 to the reference point;

using a coaxial constraint module in Solidworks, respectively placing an output crank arm 4 and a large crank arm 7 on an operating shaft 6, and modifying the positions of parts on the operating shaft 6 according to the distance between the geometric center point of each of the two parts and the geometric center point of the operating shaft 6;

the upper end of an opening transmission rod 5 is connected with the right end 19 of an output crank arm, the lower end point 17 of the transmission rod is connected with the left end 18 of the output crank arm, the central point 22 of an arc-shaped part of a closing transmission rod is connected with a ratchet wheel 12, the upper end point 16 of the transmission rod is connected with a crank arm 2, the right end point of the crank arm 2 is connected with the geometric central point 14 of a linkage plate, and the geometric central point of a roller 9 is connected with the lower end point 21 of a large crank arm by using a coaxial constraint module in Solidworks; the end point positions of the parts in the model are shown in FIG. 2;

using a contact constraint module in Solidworks, selecting a closing holding pawl 8 and a roller 9, and simultaneously adjusting the position of the closing holding pawl 8 according to the distance from a rotating center 24 of the closing holding pawl to a geometric central point of an operating shaft 6 and the height from a reference surface; the assembled model is shown in fig. 1. After the assembly model is completed, the assembly model is saved in the x _ t format.

And B: importing the assembly body model into ADAMS software to generate a multi-body dynamic model of the operating mechanism; parameters of each part in the multi-body dynamic model and constraint relations among the parts are set in the ADAMS. The method specifically comprises the following steps:

b1: the materials of the parts in the operating mechanism comprise 45-grade steel, Q235A, 20CrMnTi and 60Si2CrVA, and in the embodiment, the density of all the parts in the multi-body dynamic model is uniformly set to be 7.85 multiplied by 10^-6kg·mm^-3。

B2: arranging kinematic pairs on the multi-body dynamic model parts; the method specifically comprises the following steps:

arranging a rotary pair R1, respectively selecting a geometric center point and an interface blank of the operating shaft 6, and placing the rotary pair at the geometric center point of the operating shaft 6;

arranging a rotating pair R2, respectively selecting a geometric center point and an interface blank of the energy storage shaft 11, and placing the rotating pair at the geometric center point of the energy storage shaft 11;

arranging a rotating pair R3, respectively selecting a rotating central point 24 of the closing holding pawl and an interface blank, and placing the rotating pair at the rotating central point 24 of the closing holding pawl;

arranging a rotary pair R4, respectively selecting the geometric center points of the operating shaft 6 and the output crank arm 4, and placing the rotary pair at the geometric center point of the operating shaft 6;

arranging a rotary pair R5, respectively selecting the geometric center points of the operating shaft 6 and the large crank arm 7, and placing the rotary pair at the geometric center point of the operating shaft 6;

arranging a rotating pair R6, respectively selecting the geometric center points of the energy storage shaft 11 and the cam 10, and placing the rotating pair at the geometric center point of the energy storage shaft 11;

arranging a rotating pair R7, respectively selecting the geometric center points of the operating shaft 6 and the ratchet wheel 12, and placing the rotating pair at the geometric center point of the ratchet wheel 12;

arranging a rotary pair R8, respectively selecting the geometric central points of the closing transmission rod 13 and the ratchet wheel 12, and placing the rotary pair at the central point 22 of the arc-shaped part of the closing transmission rod; the position of the central point 22 of the arc-shaped part of the closing transmission rod in the model is shown in fig. 2;

arranging a rotating pair R9, respectively selecting the geometric central points of the opening transmission rod 5 and the output crank arm 4, and placing the rotating pair at the central point 19 on the right side of the output crank arm; the position of the center point 19 on the right side of the output crank arm in the model is shown in fig. 2;

arranging a revolute pair R10, respectively selecting the geometric center points of the large crank arm 7 and the roller 9, and placing the revolute pair at the geometric center point of the roller 9;

arranging a rotary pair R11, respectively selecting the geometric center points of the output crank arm 4 and the transmission rod 3, and placing the rotary pair at the center point 18 on the left side of the output crank arm; the position of the center point 18 on the left side of the output crank arm in the model is shown in fig. 2;

arranging a rotating pair R12, respectively selecting the geometric center points of the transmission rod 3 and the crank arm 2, and placing the rotating pair at the center point 16 of the upper part of the transmission rod; the position of the centre point 16 of the upper part of the driving rod in the mould is shown in figure 2;

arranging a rotating pair R13, respectively selecting the geometric center points of the crank arm 2 and the linkage plate 1, and placing the rotating pair at the geometric center point 14 of the linkage plate;

setting a moving pair T1, respectively selecting a closing spring placing point 23 and an interface blank at the tail end of a closing transmission rod 13, placing the moving pair on the closing spring placing point 23, and simultaneously setting the direction of the moving pair to be the same as the direction of gravity in an ADAMS interface; the position of the closing spring placing point 23 in the model is shown in fig. 2;

setting a sliding pair T2, respectively selecting a separating brake spring placing point 20 and an interface blank at the tail end of the separating brake transmission rod 5, placing the sliding pair on the separating brake spring placing point 20, and simultaneously setting the direction of the sliding pair to be the same as the direction of gravity in an ADAMS interface; the position of the opening spring placing point 20 in the model is shown in FIG. 2;

arranging a fixed pair F1, respectively selecting the geometric center points of the ratchet wheel 12 and the energy storage shaft 11, and placing the fixed pair at the geometric center of the energy storage shaft 11;

arranging a fixed pair F2, respectively selecting the geometric center points of the energy storage shaft 11 and the cam 10, and placing the fixed pair at the geometric center point of the energy storage shaft 11;

arranging a fixed pair F3, respectively selecting the geometric center points of the large crank arm 7 and the operating shaft 6, and placing the fixed pair at the geometric center point of the operating shaft 6;

and arranging a fixed pair F4, respectively selecting the geometric center points of the output crank arm 4 and the operating shaft 6, and placing the fixed pair at the geometric center point of the operating shaft 6.

B3: setting collision, spring and friction acting force in the multi-body dynamic model; the method specifically comprises the following steps:

selecting a collision module Contact1 in the ADAMS software action force column, and then respectively selecting the outer surfaces of the large crank arm 7 and the closing holding pawl 8 to complete the setting of collision action force;

selecting a collision module Contact2 in the ADAMS software action force column, and then respectively selecting the outer surfaces of the cam 10 and the roller 9 to complete the setting of collision action force;

selecting a Spring module Spring1 in the ADAMS software acting force column, and then respectively selecting a placing point 23 of the closing Spring and a blank position of an interface right above the placing point to construct the closing Spring;

and selecting a Spring module Spring2 in the column of the acting force of the ADAMS software, and then respectively selecting the placing point 20 of the opening Spring and the blank of the interface right above the placing point to construct the opening Spring.

And C: and setting the magnitude of each acting force in the multi-body dynamic model. The method specifically comprises the following steps:

c1: obtaining the wire diameter d of the closing and opening spring in the material₁、d₂Outer diameter D₁、D₂Total number of turns of spring N₁、N₂(ii) a Height l of closing spring in free state, height h of closing spring in stored energy state, and height l of opening spring in free state₀Height x in the pre-compressed state;

c2: calculating the stiffness coefficient k of the closing and opening springs by using the data in C1₁、k₂And the pressure F exerted on both₁、F₂：

N_c1＝N₁-2；D_m1＝D₁-d₁；G＝210GPa

N_c2＝N₂-2；D_m2＝D₂-d₂；G＝210GPa

F₁＝k₁·(l-h)

F₂＝k₂·(l₀-x)

C3: the dynamic friction coefficient of the lubricated ferroalloy is 0.1, the static friction coefficient of the lubricated ferroalloy is 0.12, the dynamic friction coefficients of all rotating pairs except the rotating pairs R1 and R2 in the model are set to be 0.1, and the static friction coefficient of the lubricated ferroalloy is set to be 0.12;

c4: the rotating pairs R1 and R2 are used for equivalent rolling bearings arranged on an operating shaft and an energy storage shaft in actual equipment of an operating mechanism, the dynamic friction coefficients of the rotating pairs R1 and R2 are both set to be 0.0035, and the static friction coefficient is set to be 0.0040;

c5: setting parameters of a Simulation Control module in ADAMS as follows: the simulation end time is 0.1s, and the simulation steps are 100 steps.

Step D: and setting an observation point, and acquiring a stroke curve and a speed curve of the multi-body dynamic model of the operating mechanism. The method specifically comprises the following steps:

d1: selecting a Marker point in a Construction column in ADAMS software, and fixing the Marker point at the tail end 15 of the crank arm; the specific location of the crank arm end 15 is shown in fig. 2;

d2: after fixing the Marker point, selecting the Measure option of the point, selecting the relational displacement in the Characteriostic column, and then clicking 'Y' in the Component column; and named as displacement (actuator stroke);

d4: selecting the Measure option of the Marker point again, selecting the relational coordinate in the Characteriostic column, and then clicking 'Y' in the Component column; and is named as velocity (operating mechanism movement speed)

D5: carrying out simulation calculation on a multi-body dynamic model of the operating mechanism to obtain a stroke and speed curve of the operating mechanism;

d6: and after the calculation is finished, selecting a Postprocessor module in a Result column in the ADAMS, and respectively selecting displacement and velocity in a Measure column of the module to obtain a stroke curve and a speed curve of the operating mechanism.

Step E: and verifying the stroke curve of the operating mechanism. The method specifically comprises the following steps:

e1: extracting the peak value X of the travel curve in the calculation result_pAnd its corresponding time t_pMoving contact motion time t and peak value v of speed curve_pAnd the corresponding timeV is between_t；

E2: acquiring measured values of the five physical quantities in the step E1;

e3: comparing the five physical quantity values extracted in the step E1 with the corresponding actual measurement results in the step E2, and calculating the deviation of each of the five physical quantity values:

e4: if the absolute values of the deviations of the five physical quantities in the step E3 can be controlled within 20%, the stroke curve of the operating mechanism is in accordance with the reality and can be used for fault diagnosis research of the circuit breaker; otherwise, returning to the step C4 to modify the dynamic friction coefficients of the rotating pair R1 and R2 until the calculation result meets the requirement that the deviation is less than 20%.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.