1. A transmitter damping time testing device is characterized by comprising:

the pressure setting device is used for providing stable pressure for the transmitter to be tested;

the pressure relief device is connected with the output end of the pressure setting device and the input end of the transmitter to be tested and used for releasing the pressure of the transmitter to be tested;

the signal control device is used for sending a first logic signal to the pressure giving device to control whether the pressure giving device provides pressure for the transmitter or not and sending a second logic signal to the pressure relief device to control whether the pressure relief device releases the pressure of the transmitter to be tested or not;

and the damping calculation device is used for acquiring the analog current signal output by the tested transmitter when the pressure relief device releases the pressure of the tested transmitter, and calculating the damping time of the tested transmitter.

2. The transmitter damping time testing apparatus of claim 1, wherein said pressure setting device comprises a pressure source and an isolation valve;

the input end of the isolation valve is connected with the pressure source, and the output end of the isolation valve is connected with the pressure relief device; the signal control device is in communication connection with the isolation valve and controls the isolation valve to be opened or closed.

3. The transmitter damping time testing arrangement of claim 1, wherein said pressure relief device includes a tee fitting, a relief passage, a relief valve, and a vent;

the first end of the three-way joint is connected with the pressure setting device, the second end of the three-way joint is connected with the transmitter to be tested, the third end of the three-way joint is connected with the discharge passage, the pressure relief valve is arranged on the discharge passage, and the discharge port is arranged at the tail end of the discharge passage; and the signal control device is in communication connection with the pressure relief valve and controls the pressure relief valve to be opened or closed.

4. The transmitter damping time testing device of claim 1, wherein the damping calculation device is further configured to collect a second logic signal when the pressure relief device releases the pressure of the transmitter under test.

5. The transmitter damping time testing apparatus of claim 3, wherein a tube diameter of said bleed passage is greater than 3/8 tube diameter, and a tube length is less than 5 cm.

6. The transmitter damping time testing apparatus of claim 3, wherein the vent is in the shape of an outwardly flared flare.

7. A method for testing the damping time of a transmitter, which is characterized by using the device for testing the damping time of a transmitter as claimed in any one of claims 1 to 6, and comprises the following steps:

s1: applying stable pressure to the transmitter to be tested by utilizing the pressure setting device and the pressure relief device;

s2: sending a first logic signal to the pressure giving device through the signal control device, and controlling the pressure giving device to stop providing pressure for the transmitter; sending a second logic signal to the pressure relief device, and controlling the pressure relief device to release the pressure of the transmitter to be tested;

s3: and collecting the analog current signal output by the tested transmitter when the pressure relief device releases the pressure of the tested transmitter, and calculating the damping time of the tested transmitter.

8. The transmitter damping time testing method of claim 7, wherein said step S3 includes:

s31: automatically acquiring and calculating the current output difference delta mA of the transmitter to be measured when the pressure relief device is in a stable state from the pressure release to the complete pressure release;

s32: acquiring an initial change time point T ' of the analog current signal and a time point T ' at which the analog current signal changes a first current output difference a delta mA from the time point T ';

s33: calculating the damping time T_S＝T″-T′。

9. The transmitter damping time testing method of claim 8, wherein said first current output difference a Δ mA is 63.2% Δ mA.

10. The transmitter damping time testing method of claim 8, wherein said step S3 further comprises:

and acquiring a second logic signal when the pressure relief device releases the pressure of the transmitter to be tested.

11. The transmitter damping time testing method of claim 10, wherein said step S32 further comprises: acquiring an action time point T of the second logic signal;

the step S32 is followed by: calculating T₂T' -T, and judging T₂Whether the response speed of the pressure relief device is less than or equal to the response speed of the pressure relief device, if not, taking T ═ T-T₂If yes, go to step S33.

12. The transmitter damping time testing method of claim 11, wherein a response speed of said pressure relief device is 30 ms.

Background

In the engineering field, a transmitter is usually used to measure a physical quantity signal of a process system, and the physical quantity is converted into an electrical signal for operation and processing. Because the physical quantity signal of the process system often fluctuates, the damping time setting needs to be carried out on the transmitter, and the influence of the frequent fluctuation of the signal on monitoring or control is prevented. The damping setting has a remarkable effect on relieving the fluctuation of the process system, but part of the systems need to present the fluctuation condition of the real process system, so that different functional positions have different requirements on specific damping time, and a complete intelligent testing device for the damping time of the transmitter is not available in the current market.

Disclosure of Invention

The invention aims to solve the technical problem of providing a device and a method for testing the damping time of a transmitter aiming at the defects of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a transmitter damping time testing apparatus is configured, comprising:

the pressure setting device is used for providing stable pressure for the transmitter to be tested;

the pressure relief device is connected with the output end of the pressure setting device and the input end of the transmitter to be tested and used for releasing the pressure of the transmitter to be tested;

the signal control device is used for sending a first logic signal to the pressure giving device to control whether the pressure giving device provides pressure for the transmitter or not and sending a second logic signal to the pressure relief device to control whether the pressure relief device releases the pressure of the transmitter to be tested or not;

and the damping calculation device is used for acquiring the analog current signal output by the tested transmitter when the pressure relief device releases the pressure of the tested transmitter, and calculating the damping time of the tested transmitter.

Preferably, in the transmitter damping time testing apparatus of the present invention, the pressure setting means comprises a pressure source and an isolation valve;

the input end of the isolation valve is connected with the pressure source, and the output end of the isolation valve is connected with the pressure relief device; the signal control device is in communication connection with the isolation valve and controls the isolation valve to be opened or closed.

Preferably, in the transmitter damping time testing apparatus of the present invention, the pressure relief apparatus includes a three-way joint, a relief passage, a relief valve, and a vent port;

the first end of the three-way joint is connected with the pressure setting device, the second end of the three-way joint is connected with the transmitter to be tested, the third end of the three-way joint is connected with the discharge passage, the pressure relief valve is arranged on the discharge passage, and the discharge port is arranged at the tail end of the discharge passage; and the signal control device is in communication connection with the pressure relief valve and controls the pressure relief valve to be opened or closed.

Preferably, in the transmitter damping time testing apparatus of the present invention, the damping calculating apparatus is further configured to acquire a second logic signal when the pressure relief apparatus releases the pressure of the transmitter to be tested.

Preferably, in the transmitter damping time testing apparatus of the present invention, the pipe diameter of the discharge passage is greater than the pipe diameter 3/8, and the pipe length is less than 5 cm.

Preferably, in the damping time testing device of the transmitter, the discharge port is in the shape of an outward flared horn.

The invention also constructs a transmitter damping time testing method, which adopts any transmitter damping time testing device to test, and the testing method comprises the following steps:

s1: applying stable pressure to the transmitter to be tested by utilizing the pressure setting device and the pressure relief device;

s2: sending a first logic signal to the pressure giving device through the signal control device, and controlling the pressure giving device to stop providing pressure for the transmitter; sending a second logic signal to the pressure relief device, and controlling the pressure relief device to release the pressure of the transmitter to be tested;

s3: and collecting the analog current signal output by the tested transmitter when the pressure relief device releases the pressure of the tested transmitter, and calculating the damping time of the tested transmitter.

8. The transmitter damping time testing method of claim 7, said step S3 comprising:

s31: automatically acquiring and calculating the current output difference delta mA of the transmitter to be measured when the pressure relief device is in a stable state from the pressure release to the complete pressure release;

s32: acquiring an initial change time point T ' of the analog current signal and a time point T ' at which the analog current signal changes a first current output difference a delta mA from the time point T ';

s33: calculating the damping time T_S＝T″-T′。

Preferably, in the transmitter damping time testing method of the present invention, the first current output difference a Δ mA is 63.2% Δ mA.

Preferably, in the transmitter damping time testing method of the present invention, the step S3 further includes:

and acquiring a second logic signal when the pressure relief device releases the pressure of the transmitter to be tested.

Preferably, in the transmitter damping time testing method of the present invention, the step S32 further includes: acquiring an action time point T of the second logic signal;

the step S32 is followed by: calculating T₂T' -T, and judging T₂Whether the response speed of the pressure relief device is less than or equal to the response speed of the pressure relief device, if not, taking T ═ T-T₂If yes, go to step S33.

Preferably, in the transmitter damping time testing method of the present invention, the response speed of the pressure relief device is 30 ms.

By implementing the invention, the following beneficial effects are achieved:

the device and the method for testing the damping time of the transmitter realize accurate and automatic measurement of the damping time of the transmitter to be tested, automatically identify the curve time point, reduce misjudgment of a probe caused by deviation of personnel experience on measurement data, enhance the reliability of equipment, improve the testing efficiency and save manpower and labor hour investment during measurement.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram showing the first component of the damping time testing device of the transmitter of the present invention;

FIG. 2 is a schematic diagram of the assembly of the damping time testing device of the transmitter of the present invention;

FIG. 3 is a schematic diagram of the composition of the pressure relief device of the present invention;

FIG. 4 is a schematic flow chart diagram of a transmitter damping time testing method of the present invention;

FIG. 5 is a signal plot of an analog current signal and a second logic signal in accordance with the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

It should be noted that the flow charts shown in the drawings are only exemplary and do not necessarily include all the contents and operations/steps, nor do they necessarily have to be executed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.

The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.

The first embodiment is as follows: as shown in FIG. 1, the invention discloses a transmitter damping time testing device, comprising: the device comprises a pressure setting device, a pressure relief device, a signal control device and a damping calculation device. Wherein:

the pressure setting device is used for providing stable pressure for the transmitter to be tested.

The pressure relief device is connected with the output end of the pressure setting device and the input end of the transmitter to be tested and used for releasing the pressure of the transmitter to be tested, preferably releasing the pressure quickly, the pressure releasing time is less than or equal to 10ms, and the accuracy of measuring the damping time of the transmitter to be tested is guaranteed.

The signal control device is in communication connection with the pressure setting device and the pressure relief device and is used for sending a first logic signal to the pressure setting device to control whether the pressure setting device provides pressure for the transmitter or not and sending a second logic signal to the pressure relief device to control whether the pressure relief device releases the pressure of the transmitter to be tested or not. In some embodiments, the first logic signal and the second logic signal can be 0 or 1 respectively, when the first logic signal and the second logic signal are 0, the pressure given device provides pressure for the transmitter, and the pressure relief device releases the pressure of the transmitter to be tested; when the first logic signal and the second logic signal are 1, the pressure setting device stops providing pressure for the transmitter, and the pressure relief device conducts pressure sealing on the transmitter to be tested.

The damping calculation device is connected with the pressure relief device and the measured transmitter and used for collecting analog current signals output by the measured transmitter when the pressure relief device releases the pressure of the measured transmitter and calculating the damping time of the measured transmitter.

In this embodiment, the pressure setting device comprises a pressure source and an isolation valve, as shown in fig. 2. The input end of the isolating valve is connected with the pressure source, and the output end of the isolating valve is connected with the pressure relief device. The signal control device is in communication connection with the isolation valve and controls the isolation valve to open or close, so that whether pressure is provided for the transmitter or not is controlled.

In some embodiments, the pressure source may be given in two ways: the external pressure source device is given and the self-contained pressure source device is given, and the pressure source has various choices, for example, the pressure source can be hydraulic pressure or air pressure, and the isolation valve can be a high-leakage vacuum valve or a solenoid valve. In other embodiments, the pressure setting device may further comprise a pressure regulating valve for pressure regulation, and the isolation valve and the pressure regulating valve may be controlled by a PLC for the purpose of precise pressure control.

In the present embodiment, as shown in fig. 2 and 3, the pressure relief device includes a three-way joint, a relief passage (bold line indicated by an arrow in fig. 3), a relief valve, and a vent port. The first end of the three-way joint is connected with a pressure giving device, namely, the output end of the isolating valve is connected, the second end of the three-way joint is connected with the transmitter to be tested, the third end of the three-way joint is connected with the discharge passage, the pressure relief valve is arranged on the discharge passage, and the discharge port is arranged at the tail end of the discharge passage. The signal control device is in communication connection with the pressure release valve and controls the pressure release valve to be opened or closed, so that whether pressure release is carried out on the transmitter to be tested is controlled. Preferably, the pressure relief valve can adopt a high-leakage vacuum valve or a solenoid valve and is controlled by a PLC.

In some embodiments, in order to ensure that the relief valve can be opened quickly and fully after receiving the opening command, the flow capacity of the relief channel can be increased, for example, the pipe diameter of the relief passage can be thickened, and preferably the pipe diameter of the relief passage is greater than the pipe diameter 3/8. At the same time, the discharge resistance of the discharge passage can be reduced, for example, the length of the tube of the discharge passage can be shortened, and preferably the length of the tube of the discharge passage is less than 5 cm. And, can also realize the heavy-calibre release of pressure, for example the discharge port is the shape of flaring horn mouth outward.

In this embodiment, the calculating the damping time of the transmitter under test by the damping calculating device specifically includes:

automatically acquiring and calculating the current output difference delta mA of the transmitter to be measured when the pressure relief device is in a stable state from the pressure release to the complete pressure release;

acquiring an initial change time point T ' of the analog current signal and a time point T ' at which the analog current signal starts to change from the time point T ' by a first current output difference a delta mA; in some embodiments, the first current output difference a Δ mA is 63.2% Δ mA;

calculating the damping time T_S＝T″-T′。

In other embodiments, in order to ensure that the pressure relief device is within the normal response speed, the damping calculation device is further used for acquiring a second logic signal when the pressure relief device releases the pressure of the transmitter to be tested. Completely, the damping calculation device is used for collecting a second logic signal when the pressure relief device releases the pressure of the transmitter to be tested and a simulation current signal output by the transmitter to be tested, and calculating the damping time of the transmitter to be tested according to the second logic signal and the simulation current signal.

The calculation of the damping time of the transmitter to be measured by the damping calculation device specifically comprises:

automatically acquiring and calculating the current output difference delta mA of the transmitter to be measured when the pressure relief device is in a stable state from the pressure release to the complete pressure release;

obtaining the action time point T of the second logic signal, obtaining the initial change time point T 'of the analog current signal and obtaining the time point T' of the analog current signal from T^′The point in time starts to change the point in time T "of the first current output difference a Δ mA. In some embodiments, the first current output difference a Δ mA is 63.2% Δ mA;

calculating T₂T' -T, and judging T₂Whether the response speed of the pressure relief device is less than or equal to the response speed of the pressure relief device, if not, taking T ═ T-T₂If yes, calculating damping time T_ST "-T'. In some embodiments, the response speed of the pressure relief device is the response speed of the pressure relief valve, e.g., 30 ms.

In some embodiments, the testing device is provided with a battery, so that the testing device can work under the condition of no external power supply. In addition, the device adopts solderless connection and conical surface sealing, and is suitable for the sealing requirements of most hydraulic systems. In addition, the device is small in size, light in weight, free of limitation of use space, free of additional fixation and convenient to carry and use.

Example two: as shown in FIG. 4, the invention discloses a method for testing the damping time of a transmitter, which adopts the device for testing the damping time of the transmitter to carry out the test and comprises the following steps:

step S1: applying stable pressure to the transmitter to be tested by using a pressure setting device and a pressure relief device, and sealing the pressure of the transmitter to be tested by using the pressure relief device;

step S2: sending a first logic signal to a pressure setting device through a signal control device, and controlling the pressure setting device to stop providing pressure for the transmitter; sending a second logic signal to the pressure relief device, and controlling the pressure relief device to release the pressure of the transmitter to be tested;

s3: and collecting the analog current signal output by the tested transmitter when the pressure relief device releases the pressure of the tested transmitter, and calculating the damping time of the tested transmitter.

In this embodiment, step S1 specifically includes: sending a first logic signal to an isolation valve through a signal control device to control the isolation valve to open and apply stable pressure to the transmitter to be tested; and sending a second logic signal to the pressure release valve to control the pressure release valve to close, carrying out pressure sealing on the transmitter to be tested, and applying stable pressure to the transmitter to be tested by utilizing the pressure source through the three-way joint. After the measured transmitter is applied with stable pressure, an analog current signal is output. In order to ensure the testing precision, the pressure value applied by the pressure source is 50% -70% of the measuring range of the tested transmitter. In some embodiments, for a single-sided pressure tap, the pressure tap is connected directly to the transmitter pressure tap under test at a tee joint. And for the double-side pressure sampling pipe, the three-way joint is connected to the pressure sampling pipe on the positive pressure side or the negative pressure side of the measured transmitter by combining the differential pressure measurement principle of the transmitter.

Step S2 specifically includes: sending a first logic signal to the isolation valve through the signal control device to control the isolation valve to close and stop providing pressure for the transmitter; and sending a second logic signal to the pressure relief valve to control the pressure relief valve to open, releasing the pressure of the transmitter to be tested, and releasing the pressure through the relief passage and the discharge port.

As shown in fig. 5, it should be noted that the second logic signal curve shown in the figure has no relation with the current, and only represents the operating time point T of the second logic signal. Step S3 specifically includes:

step S31: automatically acquiring and calculating the current output difference delta mA of the transmitter to be measured when the pressure relief device is in a stable state from the pressure release to the complete pressure release;

step S32: acquiring an initial change time point T ' of the analog current signal and a time point T ' at which the analog current signal starts to change from the time point T ' by a first current output difference a delta mA; in some embodiments, the first current output difference a Δ mA is 63.2% Δ mA.

Step S33: calculating the damping time T_S＝T″-T′。

In this embodiment, in order to ensure that the pressure relief device is within the normal response speed, step S3 further includes: and acquiring a second logic signal when the pressure relief device releases the pressure of the transmitter to be tested. And completely, collecting a second logic signal when the pressure relief device releases the pressure of the transmitter to be tested and an analog current signal output by the transmitter to be tested, and calculating the damping time of the transmitter to be tested.

Step S32 further includes: and acquiring an action time point T of the second logic signal. Step S32 is followed by: calculating T₂T' -T, and judging T₂Whether the response speed of the pressure relief device is less than or equal to the response speed of the pressure relief device, if not, taking T ═ T-T₂If yes, go to step S33. In some embodiments, the response speed of the pressure relief device is the response speed of the pressure relief valve, e.g., 30 ms.

Completely, step S3 specifically includes:

step S31: automatically acquiring and calculating the current output difference delta mA of the transmitter to be measured when the pressure relief device is in a stable state from the pressure release to the complete pressure release;

step S32: acquiring an action time point T of the second logic signal, an initial change time point T ' of the analog current signal and a time point T ' of the analog current signal which changes the first current output difference a delta mA from the time point T '; in some embodiments, the first current output difference a Δ mA is 63.2% Δ mA;

calculating T₂T' -T, and judging T₂Whether the response speed of the pressure relief device is less than or equal to the response speed of the pressure relief device, if not, taking T ═ T-T₂If yes, go to step S33. In some embodiments, the response speed of the pressure relief device is the response speed of the pressure relief valve, e.g., 30 ms;

step S33: calculating the damping time T_S＝T″-T′。

The testing device and the testing method of the damping time of the transmitter adopt a microcomputer to control the testing process, adopt special testing software, can display a pressure-time curve in real time, display data in real time and store the data; the test report can be output at any time, the test report is compatible with OFFICE software, and the test result is output in two modes of a printing pictorial report mode and a standard Excel data table mode. The programmable test report is designed and arranged according to the characteristics of the programmable test report and is compatible with an external system in butt joint.

By implementing the invention, the following beneficial effects are achieved:

the device and the method for testing the damping time of the transmitter realize accurate and automatic measurement of the damping time of the transmitter to be tested, automatically identify the curve time point, reduce misjudgment of a probe caused by deviation of personnel experience on measurement data, enhance the reliability of equipment, improve the testing efficiency and save manpower and labor hour investment during measurement.

It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.