1. A measuring method for rapidly detecting the offset of a pulley steel cable is characterized by comprising the following steps:

1) determination of the separation point of the steel cable from the pulley groove: through analysis, no matter how the steel cable winds, the separation point of the steel cable and the pulley groove is always on the central axis of the pulley, and the separation point of the steel cable, namely the tangent point of the pulley, is obtained;

2) because the offset angle of the steel cable on the machine cannot be directly measured, the invention is a method for reversely pushing whether the allowable offset of the steel cable relative to the symmetrical plane of the pulley groove meets the requirement or not by converting the allowable maximum offset angle 2 degrees of the steel cable to the symmetrical plane of the pulley groove into the length from the contact point of the steel cable to the side surface of the pulley groove to the separation point of the steel cable from the pulley groove, and according to the separation point of the steel cable, namely the tangent point of the pulley, the measurement position of the steel cable from the separation point of the pulley groove can be converted into the measurement position of the steel cable from the center of the pulley shaft, and because the distance from the steel cable to the center of the pulley shaft and the size of the pulley are limited, the direct measurement cannot be carried out, in order to ensure the distance from the offset point of the steel cable to the center of the pulley shaft and the offset size from the offset point to the side surface of the pulley, the auxiliary measurement needs to be carried out by a detection tool;

and according to the thickness H of the pulley and the diameter d of the steel cable, converting the trigonometric function relationship to obtain the position of the length L of the extension end of the detection tool, which is not in contact with the side face of the steel cable, namely the position is qualified.

2. The method as claimed in claim 1, wherein the method comprises the following steps:

1) when the machine is used for detection, the semicircular bayonet at the front end of the detection tool is clamped on the shaft at the outer side of the pulley;

2) rotating the detection tool around the pulley shaft to the upper edge of the extending end of the tool to keep parallel to the direction of the steel cable;

3) the side surface of the detection tool is ensured to be tightly attached to the side surface of the pulley;

4) checking that if the side of the extended end of the detection tool is not in contact with the steel cable, the deviation of the steel cable to the symmetry plane of the pulley groove is not more than 2 degrees, and if the side of the extended end of the detection tool is in contact with the steel cable, the deviation of the steel cable to the symmetry plane of the pulley groove is more than 2 degrees.

3. The method for rapidly detecting the offset of the pulley cable according to claim 1, wherein the conversion of the measuring method is as follows:

calculating according to the included angle between the detection tool and the side contact point of the steel cable and the maximum deviation angle of the steel cable by 2 degrees

cos2°≈0.999 ②

Deducing from step two:

is released by the third step:

to obtain: knowing the sheave thickness H and the wire diameter d, the wire offset is determined to be less than 2 ° as long as the sensing tool L does not contact the wire for the length.

4. The method as claimed in claim 1, wherein the radius R of the front bayonet of the detection tool is the same as the radius of the pulley shaft.

5. The method as claimed in claim 1, wherein the height h from the center of the rotation axis at the detecting end of the detecting tool is not less than the radius of the cable plus the radius of the inner groove of the pulley.

6. The method as claimed in claim 1, wherein the height h1 from the lower edge of the detecting end of the detecting tool to the center of the rotation shaft is not greater than the radius of the inner sheave groove.

7. The method as claimed in claim 1, wherein the extension end L of the measuring tool is used for measuring the sliding amount of the pulley and the steel cable according to the thickness of the pulley and the diameter of the steel cable.

8. The method as claimed in claim 1, wherein the thickness of the pulley is determined according to the practical situation of space on the machine, and the radius R1 of the outer edge of the pulley is set according to the maximum outer radius of the pulley.

9. The method as claimed in claim 1, wherein the height h from the upper edge of the detecting end of the detecting tool to the center of the rotating shaft is equal to the height h1 from the lower edge of the detecting end of the detecting tool to the center of the rotating shaft plus the diameter of the steel cable.

Background

The Y9 type platform airplane needs to detect whether the offset of a pulley steel cable on the airplane relative to a pulley groove symmetry plane meets the requirement in the installation and debugging process of a control system: the technical requirement is that the central line of the steel cable is coincident with the plane of the pulley groove. The allowable deflection of the steel cable to the symmetry plane of the pulley groove should not exceed 2 degrees, namely, the point A on the steel cable, which is 100mm away from the separation point of the steel cable and the pulley groove, is pulled to the symmetry plane of the pulley groove, and when the central line of the steel cable is superposed with the symmetry plane of the pulley groove, the displacement of the point A should not be more than 3.5 mm. Because the deviation angle between the symmetry plane of the pulley groove and the central line of the steel cable is formed into a three-dimensional space position in the installation process, the separation point of the steel cable and the pulley groove is a variable, the separation point positions of the steel cables with different winding shapes on the pulley are different, and an accurate relative measurement base point cannot be determined on an airplane.

Chinese patent publication No. CN109827496A, published 2019, 05 and 31, the name of the invention (utility model) is a pulley steel cable deflection measuring instrument, and this application discloses that an L-shaped shift lever is rotatably disposed on a shift lever turntable, the shift lever is rotatably disposed with a dial, the dial can be shown when the L-shaped shift lever rotates, the initial position of the L-shaped shift lever is located on a pulley groove symmetry plane, and through mechanical deflection, the manner of the number of degrees of the dial checks whether the steel cable center and the pulley groove symmetry plane deflection meet the deflection requirement. The disadvantages (shortcomings) are: 1. the measuring instrument is complex in manufacturing and assembling, high in precision requirement and high in cost, and 2, after the measurement is finished, a complex calculation process is needed, and whether the steel cable offset meets the requirement cannot be visually judged.

Disclosure of Invention

1.1, the central line of the steel cable is coincided with the plane of the pulley groove according to the technical requirement. The allowable deflection of the cable to the pulley groove symmetry plane should not exceed 2 °, i.e. the distance between the point on the cable which is 100mm away from the separation point of the cable from the pulley groove and the pulley groove symmetry plane should not be more than 3.5 mm.

1.2, because the deviation angle between the symmetry plane of the pulley groove and the central line of the steel cable forms a three-dimensional space position in the installation process, the separation point of the steel cable and the pulley groove is a variable, the separation point positions of the steel cables with different winding shapes on the pulley are different, an accurate relative measurement base point cannot be determined on the airplane, and the specific deviation point position cannot be determined.

Technical scheme

A measuring method for rapidly detecting the offset of a pulley steel cable comprises the following steps:

2.1, determining the separation point of the steel cable and the pulley groove: according to the invention, through analysis, no matter how the steel cable winds, the separation point of the steel cable and the pulley groove is always on the central axis of the pulley, and the separation point of the steel cable, namely the tangent point of the pulley, is obtained.

2.2, because the offset angle of the steel cable on the machine can not be measured directly, the invention is a method for reversely pushing whether the allowable offset of the steel cable relative to the symmetrical plane of the pulley groove meets the requirement or not by converting the allowable maximum offset angle 2 degrees of the steel cable to the symmetrical plane of the pulley groove into the length of the steel cable offset to the contact point of the steel cable and the side surface of the pulley groove from the separation point of the pulley groove.

And according to the thickness H of the pulley and the diameter d of the steel cable, converting the trigonometric function relationship to obtain the position of the length L of the extension end of the detection tool, which is not in contact with the side face of the steel cable, namely the position is qualified.

The specific operation steps on the machine are as follows:

1) when detecting on the machine, the semi-circle bayonet at the front end of the detection tool is clamped on the outer shaft of the pulley (as shown in figure 6)

2) Rotating the detection tool around the pulley shaft to the extended end of the tool to keep the tool parallel to the steel cable

3) Ensure that the side surface of the detection tool is tightly attached to the side surface of the pulley

4) Checking that if the side surface of the extension end of the detection tool is not contacted with the steel cable, the steel cable does not deviate from the symmetrical plane of the pulley groove by more than 2 degrees; if they touch, the deviation of the wire rope from the symmetry plane of the pulley groove proves to be more than 2 deg..

The conversion of the measuring method is specifically as follows:

calculating according to the included angle between the detection tool and the side contact point of the steel cable and the maximum deviation angle of the steel cable by 2 degrees

cos2°≈0.999 ②

Is pushed out from：

Is released by the third step:

to obtain: knowing the sheave thickness H and the wire diameter d, the wire offset is determined to be less than 2 ° as long as the sensing tool L does not contact the wire for the length.

The radius R of the bayonet at the front section of the tool is the same as the radius of the pulley shaft,

the height h from the upper edge of the detection end of the detection tool to the center of the rotating shaft is not less than the radius of the steel cable plus the radius of the inner wheel groove of the pulley,

the height h1 from the lower edge of the detection end of the detection tool to the center of the rotating shaft is not more than the radius of the inner wheel groove,

the extension end L of the detection tool can be made into fixed length or sliding detection with a scale pattern according to the thickness of the pulley and the diameter of the steel cable,

thickness can be according to the space actual conditions on the machine and decide, and pulley outer fringe radius R1 sets up according to the biggest excircle radius of pulley, and the detection instrument of being convenient for laminates the pulley side and detects.

The height h from the upper edge of the detection end of the detection tool to the center of the rotating shaft is equal to the height h1 from the lower edge of the detection end of the detection tool to the center of the rotating shaft plus the diameter of the steel cable.

Technical effects

1. The invention can quickly determine the separation point of the steel cable and the pulley groove and the size of the separation point of the steel cable distance;

2. quickly determining a measurement reference point, and converting three-dimensional space measurement into two-dimensional plane measurement through a detection tool;

3. the invention is suitable for the judgment and detection of pulleys and steel cables of different types and specifications of various systems;

4. the auxiliary detection tool is simple to manufacture, low in cost, small, portable and simple to operate;

5. one person can operate alone, namely the measurement is carried out immediately, and the operation is convenient and fast.

Drawings

FIG. 1 is a graph of wire rope deflection;

FIG. 2 is a graph of a wire rope separation point analysis;

FIG. 3 is a schematic view of the measurement;

FIG. 4 is a plot of a measurement algorithm;

1-thickness of pulley H, 2-diameter of steel cable d, inspection end of inspection tool L

FIG. 5 is a diagram of a detection tool;

FIG. 6 is a diagram of inspection tool usage.

Detailed Description

The invention will now be described in further detail with reference to the accompanying figures 1-6 and the detailed description of the invention:

determination of the separation point of the steel cable from the pulley groove: according to the invention, through analysis, no matter how the steel cable winds, the separation point of the steel cable and the pulley groove is always on the central axis of the pulley, and the separation point of the steel cable, namely the tangent point of the pulley, is obtained.

The invention relates to a method for reversely pushing whether the allowable offset of a steel cable relative to a pulley groove symmetrical plane meets the requirement or not by converting the maximum allowable offset angle 2 degrees of the steel cable to the pulley groove symmetrical plane into the length of the steel cable offset to a point contacting with the pulley side surface and a point separating from the pulley groove.

And according to the thickness H of the pulley and the diameter d of the steel cable, converting the trigonometric function relationship to obtain the position of the length L of the extension end of the detection tool, which is not in contact with the side face of the steel cable, namely the position is qualified.

1) The diameter of the steel cable is phi 3.6, and the thickness of the pulley is HB 5-54-80 mm.

When the steel cable deviates 2 degrees from the center line, the center of the steel cable deviates H/2 when a point on the steel cable, which is L mm away from the separation point of the steel cable and the pulley groove, is just in contact with the detection tool;since the diameter of the steel cable is phi 3.6mm, the gap between the point on the steel cable, which is L mm away from the separation point of the steel cable and the pulley groove, and the plane isThat is, the actual wire rope deviation between the point on the wire rope, which is L mm away from the separation point of the wire rope and the pulley groove, and the contact point of the detection tool is less than 3.7mm, and the length can be rounded up to 106mm, for the manufacturing of the detection tool and the improvement of the detection precision according to the condition that L < 100 (H-d)/7 is 100 (11-3.6)/7 is 105.7. The rope deflection does not exceed 2 as long as the detection tool does not contact the rope within 106mm of length.

2) The diameter of the steel cable is phi 3, and the thickness of the pulley is HB 5-54-70 mm.

When the steel cable deviates 2 degrees from the center line, the center of the steel cable deviates H/2 when a point on the steel cable, which is L mm away from the separation point of the steel cable and the pulley groove, is just in contact with the detection tool; since the diameter of the steel cable is phi 3.6mm, the gap between the point on the steel cable, which is L mm away from the separation point of the steel cable and the pulley groove, and the plane isThat is, the actual steel rope deviation between the point on the steel rope, which is L mm away from the separation point of the steel rope and the pulley groove, and the contact point of the detection tool is less than 3.5mm, and the steel rope deviation is not more than 2 degrees as long as the detection tool does not contact the steel rope within the length of 100mm according to the L < 100 (H-d)/7-100 (10-3)/7-100.