A device suitable for testing the performance of sensors of different types

Abstract

The present invention provides a device suitable for testing the performance of sensors of different models, comprising: a box body, and a table top fixed on the box body, on which an actuator is arranged; the actuator comprises at least: a sensor mounting head, a standard force sensor and a high-precision grating ruler; the sensor mounting head is used to mount a displacement sensor to be measured or a proportional valve electromagnet to be measured; and the sensor mounting head is configured to: move in six degrees of freedom to adjust the position of the displacement sensor to be measured or the proportional valve electromagnet to be measured; the standard force sensor is configured to: move linearly toward the sensor mounting head or away from the sensor mounting head; the high-precision grating ruler is arranged on the table top, and the high-precision grating ruler is parallel to the direction of linear motion of the standard force sensor. The displacement sensor test and the proportional valve electromagnet test of the present invention are integrated and completed on the same test bench, which improves the flexibility and efficiency of the test and reduces the offset and error caused by the previous tests using different methods and test benches.

Description

Technical Field

[0001] The invention relates to the technical field of sensor element performance testing, and in particular to a device suitable for performance testing of sensors of different models. Background Art

[0002] With the development of modern industrial technology, the detection of working parameters is becoming more and more important, and it is also the key to current detection technology. Sensors serve as a bridge for the control system to perceive the outside world. The control system uses sensor information to obtain the state of the body, the state of the controlled object, and the state of the surrounding environment, just like people see with their eyes, hear with their ears, and touch with their skin. As the most widely used electro-mechanical conversion element in electro-hydraulic proportional technology, the working characteristics of the proportional valve solenoid have a very important impact on the performance of the electro-hydraulic proportional control element and the entire system. With the development of intelligent control technology, more and more innovative technologies are being applied to displacement sensors and proportional valve solenoids, resulting in differences in the range, power supply, interface, output and input signals of different models, which leads to different test steps, requiring the test methods and test systems to be customized one by one, greatly increasing the development and maintenance costs, and the work flexibility is highly insufficient, the work efficiency is greatly reduced, and the test data cannot be centrally compared and saved because they are scattered in various test systems, resulting in the problem of easy data loss and inconvenience in subsequent processing.

[0003] At present, the integrated method of performance testing of multiple types of sensors is still in its infancy at home and abroad, and there is no single device suitable for testing multiple types of sensors. How to integrate the characteristics of various sensors into one testing method is still a problem that needs to be solved urgently. Summary of the invention

[0004] The present invention provides a device suitable for testing the performance of sensors of different models, so as to solve the technical problems that the performance tests of existing displacement sensors and proportional valve electromagnets need to be customized one by one, the maintenance cost is high, the working flexibility is insufficient, and the working efficiency is reduced.

[0005] The technical solution provided by the present invention is as follows:

[0006] An object of the present invention is to provide a device suitable for testing the performance of sensors of different models, the device comprising: a box body, and a table fixed on the box body, an actuator being arranged on the table body;

[0007] The actuator at least comprises: a sensor mounting head, a standard force sensor and a high-precision grating ruler;

[0008] The sensor mounting head is used to mount the displacement sensor to be measured or the proportional valve electromagnet to be measured; and the sensor mounting head is configured to: move in six degrees of freedom to adjust the position of the displacement sensor to be measured or the proportional valve electromagnet to be measured;

[0009] The standard force sensor is configured to: move linearly toward the sensor mounting head or away from the sensor mounting head;

[0010] The high-precision grating scale is arranged on the table, and the high-precision grating scale is parallel to the direction of linear motion of the standard force sensor.

[0011] In a preferred embodiment, the table top is provided with a guide rail and a linear motor;

[0012] A slider is slidably installed on the guide rail, and the slider is connected to the output end of the linear motor;

[0013] A protection bracket is fixed on the sliding block, a mounting bracket is fixed on the protection bracket, and the standard force sensor is fixed on the mounting bracket.

[0014] In a preferred embodiment, a scanner is fixed on the slider; when the standard force sensor moves linearly toward the sensor mounting head or away from the sensor mounting head, the scanner scans the high-precision grating ruler, triggering the high-precision grating ruler to generate position data.

[0015] In a preferred embodiment, a multi-degree-of-freedom adjustment table is fixed on the table top, a clamping mechanism is fixed on the multi-degree-of-freedom adjustment table, and the sensor mounting head is fixed on the clamping mechanism;

[0016] The multi-degree-of-freedom adjustment platform moves in six degrees of freedom directions, driving the sensor mounting head to move in six degrees of freedom directions, and adjusting the position of the displacement sensor to be measured or the electromagnet of the proportional valve to be measured.

[0017] In a preferred embodiment, a control system is configured in the box, and the control system at least includes: an electric measurement module, a motion controller, and a programmable power supply / drive circuit;

[0018] The electrical measurement module is used to collect the electrical signal of the displacement sensor to be measured, the force signal of the standard force sensor and the position data of the high-precision grating ruler;

[0019] The motion controller is used to drive the standard force sensor to move linearly toward the sensor mounting head or away from the sensor mounting head;

[0020] The programmable power supply / drive circuit is used to apply an electrical signal to the solenoid of the proportional valve being tested.

[0021] In a preferred embodiment, the control system further comprises a driver, and the motion controller is connected to the driver;

[0022] The motion controller sends a control signal to the driver to drive the standard force sensor to move linearly toward the sensor mounting head or away from the sensor mounting head.

[0023] In a preferred embodiment, the control system further includes a signal conditioning circuit, a GPIB communication interface and a power supply module;

[0024] The signal conditioning circuit is connected to the electrical measurement module, and the signal conditioning circuit is used to condition the signal collected by the electrical measurement module;

[0025] The GPIB communication interface connects the signal conditioning circuit, the motion controller and the programmable power supply / drive circuit;

[0026] The GPIB communication interface is used to respectively communicate the signal conditioning circuit, the motion controller and the programmable power supply / drive circuit with a host computer.

[0027] In a preferred embodiment, the electrical measurement module adopts a high-precision 7 ½ digit desktop multimeter.

[0028] The above technical solution of the present invention has at least the following beneficial effects compared with the prior art:

[0029] The present invention provides a device suitable for performance testing of sensors of different models, which has the advantages of high flexibility, high adaptability, etc. The displacement sensor test and the proportional valve solenoid test are integrated on the same test bench, which greatly improves the flexibility and efficiency of the test, reduces the offset and error caused by the need for different methods and test benches for testing in the past, and greatly reduces the development and maintenance costs. The work flexibility is highly sufficient, the work efficiency is greatly improved, and the test data is convenient for centralized comparison and storage.

[0030] The present invention provides a device suitable for performance testing of sensors of different models, which is applied to the calibration and performance testing of displacement sensors and proportional valve electromagnets, meets the testing requirements of various displacement sensors and proportional valve electromagnets of different models, adapts to the working time requirements in practical applications, is convenient and fast, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a front schematic diagram of a device suitable for performance testing of sensors of different models according to the present invention.

[0033] Figure 2 It is a stereoscopic diagram of a device suitable for testing the performance of sensors of different models according to the present invention.

[0034] Figure 3 It is a structural schematic diagram of the actuator of the present invention.

[0035] Figure 4 It is a structural block diagram of the control system of the present invention.

[0036] Figure 5 It is a schematic diagram of an electrical signal-displacement curve of a displacement sensor fitted in one embodiment of the present invention.

[0037] Figure 6 Schematic diagram of displacement-force curve of proportional valve electromagnet fitted in one embodiment of the present invention.

[0038] Figure 7 Schematic diagram of an electrical signal-force curve of a proportional valve electromagnet fitted in one embodiment of the present invention.

[0039] Figure 8 Schematic diagram of a time-force curve of a proportional valve electromagnet fitted in one embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0042] It should be noted that the terms "up", "down", "left", "right", "front", "back", etc. used in the present invention are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0043] Combination Figure 1 , Figure 2 and Figure 3 According to an embodiment of the present invention, a device suitable for testing the performance of sensors of different models is provided, comprising: a box 100, and a table 200 fixed on the box 100. An actuator 300 is arranged on the table 200. In this embodiment, the table 200 is a marble table.

[0044] The actuator 300 includes: a sensor mounting head 309 , a standard force sensor 306 and a high-precision grating ruler 310 .

[0045] The sensor mounting head 309 is used to mount the displacement sensor to be measured or the electromagnetic magnet of the proportional valve to be measured. The sensor mounting head 309 is configured to move in six degrees of freedom to adjust the position of the displacement sensor to be measured or the electromagnetic magnet of the proportional valve to be measured.

[0046] Specifically, the actuator 300 further includes a multi-degree-of-freedom adjustment platform 307, and the multi-degree-of-freedom adjustment platform 307 is fixed on the platform 200. A clamping mechanism 308 is fixed on the multi-degree-of-freedom adjustment platform 307, and a sensor mounting head 309 is fixed on the clamping mechanism 308.

[0047] The multi-degree-of-freedom adjustment platform 307 moves in six degrees of freedom, driving the clamping mechanism 308 and the sensor mounting head 309 to move in six degrees of freedom to adjust the position of the displacement sensor or the proportional valve electromagnet to be measured.

[0048] According to an embodiment of the present invention, the standard force sensor 306 is configured to move linearly toward the sensor mounting head 309 or away from the sensor mounting head 309 (the movement direction is as follows: Figure 3 as indicated by arrow a).

[0049] Specifically, the actuator 300 further includes a guide rail 304 and a linear motor 301. The guide rail 304 and the linear motor 301 are fixed on the table 200, and a slider 302 is slidably mounted on the guide rail 304, and the slider 302 is connected to the output end of the linear motor 301.

[0050] A protection bracket 303 is fixed on the slider 302 , a mounting bracket 305 is fixed on the protection bracket 303 , and a standard force sensor 306 is fixed on the mounting bracket 305 .

[0051] The output end of the linear motor 301 drives the slider 302 to move linearly on the guide rail 304 (the direction of movement is as follows: Figure 3As shown by the arrow a in the middle, the slider 302 drives the protection bracket 303, the mounting bracket 305 and the standard force sensor 306 to move linearly toward the sensor mounting head 309 or away from the sensor mounting head 309 (the movement direction is as shown in FIG. Figure 3 as indicated by arrow a).

[0052] The protection bracket 303 protects the standard force sensor 306 to prevent the standard force sensor 306 from being hit accidentally when it moves toward the sensor mounting head 309 or away from the sensor mounting head 309 in a straight line.

[0053] like Figure 3 As shown, according to an embodiment of the present invention, the high-precision grating ruler 310 is arranged on the table 200, and the high-precision grating ruler 310 and the standard force sensor 306 are in the direction of linear motion (the direction of motion is as shown in FIG. Figure 3 parallel to the center).

[0054] The slider 302 is fixed with a scanner 311. When the standard force sensor 306 moves linearly toward the sensor mounting head 309 or away from the sensor mounting head 309, the scanner 311 scans the high-precision grating ruler 310, triggering the high-precision grating ruler 310 to generate position data.

[0055] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 According to an embodiment of the present invention, a control system 400 is configured in the box 100. The control system 400 includes: an electric measurement module 401, a signal conditioning circuit 402, a motion controller 403, a driver 404, a GPIB communication interface 405, a programmable power supply / drive circuit 406, and a power supply module 407.

[0056] The electrical measurement module 401 is used to collect the electrical signal of the displacement sensor being measured, the force signal of the standard force sensor 306 and the position data of the high-precision grating ruler 310 .

[0057] The electrical measurement module 401 is connected to the standard force sensor 306 and the high-precision grating ruler 310. When the displacement sensor performance test is performed, the displacement sensor to be tested is connected to the electrical measurement module 401, and the electrical signal of the displacement sensor to be tested and the position data of the high-precision grating ruler 310 are collected through the electrical measurement module 401.

[0058] In a preferred embodiment, the electrical measurement module 401 uses a high-precision 7 ½-digit desktop multimeter, which can collect multiple types of signals, such as voltage, current, RS232, RS485 and CAN.

[0059] The signal conditioning circuit 402 is connected to the electrical measurement module 401. The signal conditioning circuit 402 is used to condition the signal collected by the electrical measurement module 401.

[0060] The motion controller 403 is used to drive the standard force sensor 306 to move linearly toward the sensor mounting head 309 or away from the sensor mounting head 309 (the direction of movement is as follows: Figure 3 as indicated by arrow a).

[0061] Specifically, the motion controller 403 is connected to the driver 404, and the driver 404 is connected to the linear motor 301. The motion controller 403 sends a control signal to the driver 404, and the driver 404 drives the linear motor 301 to move, and the linear motor 301 drives the slider 302 to move linearly on the guide rail 304 (the direction of movement is as shown in FIG. Figure 3 As shown by the arrow a in the middle, the slider 302 drives the protective bracket 303, the mounting bracket 305 and the standard force sensor 306 to move linearly toward the sensor mounting head 309 or away from the sensor mounting head 309.

[0062] The programmable power supply / drive circuit 406 is used to apply an electrical signal to the measured proportional valve electromagnet. When the proportional valve electromagnet performance test is performed, the measured proportional valve electromagnet is connected to the programmable power supply / drive circuit 406, and an electrical signal is applied to the measured proportional valve electromagnet through the programmable power supply / drive circuit 406.

[0063] The GPIB communication interface 405 connects the signal conditioning circuit, the motion controller and the programmable power supply / drive circuit. The GPIB communication interface 405 is used to communicate the signal conditioning circuit, the motion controller and the programmable power supply / drive circuit with the host computer 500 respectively.

[0064] The power supply module 407 is used to supply power to the control system 400 and the displacement sensor or the proportional valve solenoid to be measured.

[0065] like Figure 1 As shown, a power-on switch 600 of the control system 400 , a power-off switch 700 , a control power-on indicator light 800 of the control system 400 , a power power-on indicator light 900 of the control system 400 , and an emergency stop switch 1000 are arranged on the box body 100 .

[0066] The power-on switch 600 is used to control the start of the control system 400. The power-off switch 700 is used to control the shutdown of the control system 400. The emergency stop switch 1000 is used to cut off the power of the control system 400 in an emergency state.

[0067] The control power indicator 800 is used to display that the electric measuring module 401 block, the signal conditioning circuit 402, the GPIB communication interface 405, and the programmable power supply / drive circuit 406 of the control system 400 are in the power-on state. That is, when the electric measuring module 401 block, the signal conditioning circuit 402, the GPIB communication interface 405, and the programmable power supply / drive circuit 406 of the control system 400 are powered, the control power indicator 800 lights up.

[0068] The power-on indicator light 900 is used to indicate that the motion controller 403 and the driver 404 of the control system 400 are in a powered state. That is, when the motion controller 403 and the driver 404 of the control system 400 are powered, the power-on indicator light 900 lights up.

[0069] According to an embodiment of the present invention, a method for testing the performance of a displacement sensor is provided. The method uses a device suitable for testing the performance of sensors of different models provided by the present invention to test the performance of the displacement sensor, and includes the following method steps:

[0070] Step S1, power on the device.

[0071] Start the device suitable for the performance test of sensors of different models. Start the power switch 600 on the box 100, and control the power indicator light 800 and the power indicator light 900 to light up.

[0072] Step S2: installing the displacement sensor to be measured.

[0073] The displacement sensor to be measured is mounted on the sensor mounting head 309, and the position of the displacement sensor to be measured is adjusted in six degrees of freedom directions by the multi-degree-of-freedom adjustment platform 307, so that the telescopic rod of the displacement sensor to be measured and the standard force sensor 309 are in the same straight line (the telescopic rod of the displacement sensor to be measured is aligned with the standard force sensor 309).

[0074] The displacement sensor to be measured is connected to the electrical measurement module 401 of the control system 400 . The host computer 500 is started, and communication is established between the host computer 500 and the control system 400 via the GPIB communication interface 405 .

[0075] Step S3, setting a safety stroke of the standard force sensor 306.

[0076] The standard force sensor 306 is driven to move toward the sensor mounting head 309 so that the standard force sensor 306 squeezes the telescopic rod of the displacement sensor to be measured.

[0077] Specifically, the host computer 500 sends a command to the motion controller 403 through the GPIB communication interface 405, and the motion controller 403 sends a control signal to the driver 404, and the driver 404 drives the linear motor 301 to move, and the linear motor 301 drives the slider 302 to move linearly on the guide rail 304 (the direction of movement is as shown in FIG. Figure 3 As shown by the arrow a in the middle, the slider 302 drives the protection bracket 303, the mounting bracket 305 and the standard force sensor 306 to move toward the sensor mounting head 309, so that the standard force sensor 306 squeezes the telescopic rod of the displacement sensor to be measured.

[0078] The first position data of the high-precision grating ruler 310 when the telescopic rod of the displacement sensor under test contacts the standard force sensor 306 is collected; and the second position data of the high-precision grating ruler 306 when the telescopic rod of the displacement sensor under test is at the compression limit position is collected.

[0079] Specifically, the standard force sensor 306 moves toward the sensor mounting head 309, and in the process of squeezing the telescopic rod of the displacement sensor to be measured, the electrical measurement module 401 collects the electrical signal of the displacement sensor to be measured and the position data of the high-precision grating ruler 310, and after conditioning by the signal conditioning circuit 402, sends it to the host computer 500 through the GPIB communication interface 405.

[0080] In this embodiment, the electrical signal collected by the electrical measurement module 401 from the displacement sensor under test is a current signal. In some embodiments, the electrical signal collected by the electrical measurement module 401 from the displacement sensor under test can also be a voltage signal.

[0081] When the telescopic rod of the displacement sensor under test contacts the standard force sensor 306, the electrical signal of the displacement sensor under test is collected by the electrical measurement module 401 as an electrical signal and the first position data of the high-precision grating ruler 310. The first position data of the high-precision grating ruler 310 collected at this time is the position data of the telescopic rod of the displacement sensor under test in the tensile limit state.

[0082] When the telescopic rod of the displacement sensor under test is at the compression limit position, the electrical signal collected by the electrical measurement module 401 is the electrical signal and the second position data of the high-precision grating ruler 310. The second position data of the high-precision grating ruler 310 collected at this time is the position data of the telescopic rod of the displacement sensor under test in the compression limit state.

[0083] The state of the telescopic rod of the displacement sensor under test contacting the standard force sensor 306 and the state of the telescopic rod of the displacement sensor under test at the compression limit position are determined based on the electrical signal of the displacement sensor under test collected by the electrical measurement module 401 .

[0084] The first position data and the second position data are recorded, and the distance between the first position data and the second position data is used as the safety stroke of the standard force sensor 306 .

[0085] In some embodiments, in order to prevent the displacement sensor being measured from being squeezed and damaged by the standard force sensor 306 , the distance between the first position data and the second position data is appropriately shortened to serve as a safety stroke for the standard force sensor 306 .

[0086] Step S4, setting the zero point of the high-precision grating ruler 310.

[0087] A half of the difference between the first position data and the second position data (the midpoint of the distance between the first position data and the second position data) is selected as the zero point of the high-precision grating ruler 310 .

[0088] Step S5: performance test.

[0089] On both sides of the zero point of the high-precision grating ruler 310 , the positive travel range and the negative travel range of the standard force sensor 306 are selected.

[0090] For example, a position is selected between the zero point of the high-precision grating ruler 310 and the first position data, and the distance between the position and the zero point of the high-precision grating ruler 310 is used as the positive travel range of the standard force sensor 306 .

[0091] Another position is selected between the zero point of the high-precision grating ruler 310 and the second position data, and the distance between the position and the zero point of the high-precision grating ruler 310 is used as the negative travel range of the standard force sensor 306 .

[0092] Within the positive and negative travel ranges of the standard force sensor 306 , the standard force sensor 306 is driven to move linearly toward the sensor mounting head 309 or away from the sensor mounting head 309 , so that the standard force sensor 306 squeezes the telescopic rod of the displacement sensor to be measured.

[0093] Specifically, the host computer 500 sends a command to the motion controller 403 through the GPIB communication interface 405, and the motion controller 403 sends a control signal to the driver 404, and the driver 404 drives the linear motor 301 to move, and the linear motor 301 drives the slider 302 to move linearly on the guide rail 304 (the direction of movement is as shown in FIG. Figure 3 As shown by the arrow a in the middle, the slider 302 drives the protective bracket 303, the mounting bracket 305 and the standard force sensor 306 to move linearly toward the sensor mounting head 309 or away from the sensor mounting head 309, so that the standard force sensor 306 squeezes the telescopic rod of the displacement sensor to be measured.

[0094] The different position data of the high-precision grating ruler 310 within the positive travel range and the negative travel range of the standard force sensor 306 and the corresponding electrical signals of the displacement sensor under different position data of the high-precision grating ruler 310 are collected.

[0095] Specifically, within the positive stroke range and negative stroke range of the standard force sensor 306, the standard force sensor 306 moves linearly toward the sensor mounting head 309 or away from the sensor mounting head 309, so that the standard force sensor 306 squeezes the telescopic rod of the displacement sensor to be measured. During this process, the electrical measurement module 401 collects different position data of the high-precision grating scale 310 and the electrical signals corresponding to the displacement sensor to be measured under different position data of the high-precision grating scale 310, and after being conditioned by the signal conditioning circuit 402, they are sent to the host computer 500 by the GPIB communication interface 405.

[0096] The different position data of the high-precision grating ruler 310 and the electrical signals corresponding to the displacement sensor under test at the different position data of the high-precision grating ruler 310 are fitted into an electrical signal-displacement curve.

[0097] The slope of the electrical signal-displacement curve is used to characterize the sensitivity of the displacement sensor being tested.

[0098] In this embodiment, the collected electrical signal of the displacement sensor under test is a current signal, and the electrical signal-displacement curve of the fitted high-precision grating ruler 310 at different position data and the electrical signal corresponding to the displacement sensor under test at different position data of the high-precision grating ruler 310 is a current-displacement curve, such as Figure 5 The slope of the current-displacement curve is used to characterize the sensitivity of the displacement sensor under test, and a test report of the displacement sensor is generated.

[0099] According to an embodiment of the present invention, a performance test method for a proportional valve electromagnet is provided. The performance test of the proportional valve electromagnet is performed using a device suitable for performance testing of sensors of different models provided by the present invention, and the method comprises the following steps:

[0100] Step S1, power on the device.

[0101] Start the device suitable for the performance test of sensors of different models. Start the power switch 600 on the box 100, and control the power indicator light 800 and the power indicator light 900 to light up.

[0102] Step S2: installing the solenoid of the proportional valve to be tested.

[0103] The measured proportional valve electromagnet is mounted on the sensor mounting head 309, and the position of the measured displacement sensor is adjusted in six degrees of freedom directions so that the measured proportional valve electromagnet and the standard force sensor 306 are in the same straight line (the telescopic rod of the measured displacement sensor is aligned with the standard force sensor 309).

[0104] The standard force sensor 306 is adjusted to contact with the measured proportional valve electromagnet. Specifically, the slider 302 is manually adjusted to slide along the linear direction on the guide rail 304, so that the standard force sensor 306 contacts with the measured proportional valve electromagnet (only contact without extrusion).

[0105] The measured proportional valve solenoid is connected to the programmable power supply / drive circuit 406 of the control system 400. The host computer 500 is started, and the host computer 500 and the control system 400 are connected to each other through the GPIB communication interface 405.

[0106] Step S3, setting the 306 safety stroke of the standard force sensor.

[0107] According to the rated parameters of the measured proportional valve electromagnet, an electrical signal is applied to the measured proportional valve electromagnet so that the force generated by the measured proportional valve electromagnet pushes the standard force sensor 306 to move away from the sensor mounting head 309.

[0108] The rated parameters of the measured proportional valve electromagnet include rated voltage, rated current, rated force and travel range. In this embodiment, an electrical signal (current signal) is applied to the measured proportional valve electromagnet with the rated current of the measured proportional valve electromagnet.

[0109] Specifically, the host computer 500 sends instructions to the programmable power supply / drive circuit 406 through the GPIB communication interface 405, and the programmable power supply / drive circuit 406 applies an electrical signal to the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet pushes the standard force sensor 306 to move away from the sensor mounting head 309.

[0110] In this embodiment, the programmable power supply / drive circuit 406 applies an electrical signal to the measured proportional valve solenoid, increasing the current step by step from 0 mA to the rated current.

[0111] The third position data of the high-precision grating ruler 310 is collected when the measured proportional valve electromagnet contacts the standard force sensor 306; and the fourth position data of the high-precision grating ruler 310 is collected when the force generated by the measured proportional valve electromagnet is equal to the rated force.

[0112] Specifically, when the force generated by the measured proportional valve electromagnet pushes the standard force sensor 306 away from the sensor mounting head 309, the electrical measurement module 401 collects the force signal of the measured proportional valve electromagnet on the standard force sensor 306 and the position data of the high-precision grating scale 310, and after conditioning by the signal conditioning circuit 402, sends it to the host computer 500 through the GPIB communication interface 405.

[0113] When the measured proportional valve electromagnet contacts the standard force sensor 306, the electric measurement module 401 collects the force signal of the measured proportional valve electromagnet pushed by the standard force sensor 306 and the third position data of the high-precision grating ruler 310. At this time, the third position data of the high-precision grating ruler 310 is the position data of the measured proportional valve electromagnet without generating force (the current applied to the measured proportional valve electromagnet is 0 mA).

[0114] When the force generated by the measured proportional valve electromagnet is equal to the rated force, the electric measurement module 401 collects the force signal of the measured proportional valve electromagnet pushed by the measured proportional valve electromagnet on the standard force sensor 306 and the fourth position data of the high-precision grating ruler 310. At this time, the fourth position data of the high-precision grating ruler 310 is the position data of the rated force of the measured proportional valve electromagnet (the current signal applied to the measured proportional valve electromagnet is the rated current).

[0115] The third position data and the fourth position data are recorded, and the distance between the third position data and the fourth position data is used as the safety stroke of the standard force sensor 306 .

[0116] In some embodiments, in order to avoid damage to the measured proportional valve solenoid, the distance between the third position data and the fourth position data is appropriately shortened to serve as a safety stroke of the standard force sensor 306 .

[0117] Step S4, setting the zero point of the high-precision grating ruler 310.

[0118] An electrical signal of 30%-50% of the rated parameters of the measured proportional valve electromagnet is applied to the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet pushes the standard force sensor 306 to move away from the sensor mounting head 309.

[0119] Specifically, the programmable power supply / drive circuit 406 applies an electrical signal (current signal) to the measured proportional valve solenoid at 30%-50% of the rated current of the measured proportional valve solenoid, so that the force generated by the measured proportional valve solenoid pushes the standard force sensor 306 to move away from the sensor mounting head 309 (the standard force sensor 306 moves away from the sensor mounting head 309 from the position where the standard force sensor 306 contacts the measured proportional valve solenoid).

[0120] The force signal of the standard force sensor 306 pushed by the measured proportional valve electromagnet is collected until the force signal of the standard force sensor 306 pushed by the measured proportional valve electromagnet reaches a preset threshold value (preset force value).

[0121] When the force signal of the standard force sensor 306 pushed by the measured proportional valve electromagnet reaches a preset threshold, the corresponding position data of the high-precision grating ruler 310 is collected as the zero point of the high-precision grating ruler 310 .

[0122] Specifically, when the force generated by the measured proportional valve electromagnet pushes the standard force sensor 306 to move away from the sensor mounting head 309, the electrical measurement module 401 collects the force signal of the standard force sensor 306 being pushed by the measured proportional valve electromagnet, as well as the position data of the high-precision grating scale 310 corresponding to the force signal when the standard force sensor 306 is pushed by the measured proportional valve electromagnet.

[0123] When the force signal of the standard force sensor 306 pushed by the measured proportional valve electromagnet reaches a preset threshold, the corresponding position data of the high-precision grating ruler 310 is used as the zero point of the high-precision grating ruler 310 .

[0124] Step S5: performance test.

[0125] Different electrical signals are applied to the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet pushes the standard force sensor 306 to move away from the sensor mounting head 309.

[0126] The different force signals of the standard force sensor 309 and the position data of the high-precision grating ruler 310 corresponding to the different force signals of the standard force sensor 306 are collected.

[0127] Specifically, within the safe travel range (the electrical signal range corresponding to the third position data and the fourth position data, for example, the range from 0mA to the rated current), the programmable power supply / drive circuit 406 applies different electrical signals (current signals) to the measured proportional valve solenoid, so that the force generated by the measured proportional valve solenoid pushes the standard force sensor 306 to move away from the sensor mounting head 309.

[0128] The electrical measurement module 401 collects different force signals of the standard force sensor 306 (force signals driven by the solenoid of the measured proportional valve), as well as the position data of the high-precision grating ruler 310 corresponding to different force signals of the standard force sensor 306, and after being conditioned by the signal conditioning circuit 402, sends it to the host computer 500 through the GPIB communication interface 405.

[0129] In some embodiments, within the safe travel range (the electrical signal range corresponding to the third position data and the fourth position data, such as the range from 0 mA to the rated current), the programmable power supply / drive circuit 406 applies different electrical signals (current signals) to the measured proportional valve solenoid step by step. For example, the current slow speed (default 0.05 Hz, editable) continuously increases and decreases step by step between 0 and the rated current.

[0130] Different force signals of the standard force sensor 306 are fitted with position data of the high-precision grating ruler 310 corresponding to different force signals of the standard force sensor 306 into displacement-force curves to test the displacement-force characteristics of the measured proportional valve electromagnet.

[0131] like Figure 6 As shown, in one embodiment, different force signals of the fitted standard force sensor 306 are matched with displacement-force curves of position data of the high-precision grating ruler 310 corresponding to different force signals of the force sensor 306 . Figure 6 In FIG. 1 , curve X is a displacement-force curve of different force signals of the standard force sensor 306 and position data of the high-precision grating ruler 310 corresponding to different force signals of the standard force sensor 306 when the current applied by the programmable power supply / drive circuit 406 to the measured proportional valve solenoid is 2.0A.

[0132] Figure 6 In the figure, curve Y is the displacement-force curve of the position data of the standard force sensor 306 and the different force signals of the high-precision grating ruler 310 corresponding to the different force signals of the standard force sensor 306 when the current applied by the programmable power supply / drive circuit 406 to the measured proportional valve solenoid is 1.3A.

[0133] Figure 6 In the figure, curve Z is the displacement-force curve of the position data of the standard force sensor 306 and the different force signals of the high-precision grating ruler 310 corresponding to the different force signals of the standard force sensor 306 when the current applied by the programmable power supply / drive circuit 406 to the measured proportional valve solenoid is 0.7A.

[0134] Different force signals of the standard force sensor 306 and different electrical signals applied by the measured proportional valve electromagnet are fitted into an electrical signal-force curve to test the electrical signal-force characteristics of the measured proportional valve electromagnet.

[0135] In one embodiment, the programmable power supply / drive circuit 406 applies different current signals to the measured proportional valve electromagnet step by step, and the electrical measurement module 401 collects different force signals of the standard force sensor 309 (force signals pushed by the measured proportional valve electromagnet), and the electrical signal-force curves of the different force signals of the standard force sensor 306 and the different electrical signals applied by the measured proportional valve electromagnet are fitted as current-force curves, such as Figure 7 shown.

[0136] According to an embodiment of the present invention, the performance test of the proportional valve electromagnet further includes testing the frequency response characteristics of the measured proportional valve electromagnet, including the following method steps:

[0137] Within the safe travel range of the standard force sensor 306 on both sides of the zero point of the high-precision grating ruler 310, the position data of the high-precision grating ruler 310 is arbitrarily selected as the frequency response characteristic test position.

[0138] For example, in this embodiment, the position of 1.25 mm in the positive direction of the zero point of the high-precision grating ruler 310 is selected as the frequency response characteristic test position.

[0139] The electrical signal of the measured proportional valve solenoid corresponding to the frequency response characteristic test position is used as the frequency response characteristic test electrical signal.

[0140] The programmable power supply / drive circuit 406 applies an electrical signal to the measured proportional valve electromagnet, so that the force generated by the measured proportional valve electromagnet pushes the standard force sensor 306 to move away from the sensor mounting head 309, and the electrical measurement module 401 collects the position data corresponding to the high-precision grating ruler 310. In this embodiment, the electrical signal of the measured proportional valve electromagnet corresponding to the position of 1.25mm in the positive direction of the zero point of the high-precision grating ruler 310 is 1.0A, and 1.0A is used as the frequency response characteristic test electrical signal (current signal).

[0141] The programmable power supply / drive circuit 406 continuously applies a frequency response characteristic test electrical signal (eg, 1.0A) to the measured proportional valve electromagnet, and the electrical measurement module 401 collects the change value of the force signal of the standard force sensor 306 pushed by the measured proportional valve electromagnet.

[0142] The change value of the force signal of the standard force sensor 306 pushed by the measured proportional valve electromagnet is fitted with the duration of the frequency response characteristic test electrical signal continuously applied to the measured proportional valve electromagnet to form a time-force curve to test the frequency response characteristics of the measured proportional valve electromagnet. Figure 8 As shown, at the position of 1.25 mm in the positive direction of the zero point of the high-precision grating ruler 310, a time-force curve is fitted for the duration of a current signal of 1.0 A continuously applied to the measured proportional valve electromagnet. The frequency response characteristics of the frequency, output force amplitude and phase of the measured proportional valve electromagnet are characterized by the time-force curve, and the transient performance index of the measured proportional valve electromagnet is obtained.

[0143] Finally, the displacement-force curve, electrical signal-force curve and time-force curve of the measured proportional valve solenoid are used to generate a test report for the proportional valve solenoid.

[0144] There are a few points to note:

[0145] (1) The drawings of the embodiments of the present invention only involve structures related to the embodiments of the present invention. Other structures may refer to conventional designs.

[0146] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present invention, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0147] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0148] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A device suitable for testing the performance of sensors of different types, characterized in that: The device comprises: a box body, and a table top fixed on the box body, and an actuator is arranged on the table top; The actuator at least comprises: a sensor mounting head, a standard force sensor and a high-precision grating ruler; The sensor mounting head is used to mount the displacement sensor to be measured or the proportional valve electromagnet to be measured; and the sensor mounting head is configured to: move in six degrees of freedom to adjust the position of the displacement sensor to be measured or the proportional valve electromagnet to be measured; The standard force sensor is configured to: move linearly toward the sensor mounting head or away from the sensor mounting head; The high-precision grating ruler is arranged on the table, and the high-precision grating ruler is parallel to the direction of the linear motion of the standard force sensor; A guide rail and a linear motor are fixed on the table; a slider is slidably installed on the guide rail, and the slider is connected to the output end of the linear motor; a protective bracket is fixed on the slider, a mounting bracket is fixed on the protective bracket, and the standard force sensor is fixed on the mounting bracket; A scanner is fixed on the slider; when the standard force sensor moves linearly toward the sensor mounting head or away from the sensor mounting head, the scanner scans the high-precision grating ruler, triggering the high-precision grating ruler to generate position data; A control system is configured in the box, and the control system at least includes: an electrical measurement module, a motion controller, and a programmable power supply / drive circuit; The electrical measurement module is used to collect the electrical signal of the displacement sensor to be measured, the force signal of the standard force sensor and the position data of the high-precision grating ruler; The motion controller is used to drive the standard force sensor to move linearly toward the sensor mounting head or away from the sensor mounting head; The programmable power supply / drive circuit is used to apply an electrical signal to the solenoid of the proportional valve being tested.

2. The device according to claim 1, characterized in that A multi-degree-of-freedom adjustment table is fixed on the table top, a clamping mechanism is fixed on the multi-degree-of-freedom adjustment table, and the sensor mounting head is fixed on the clamping mechanism; The multi-degree-of-freedom adjustment platform moves in six degrees of freedom directions, driving the sensor mounting head to move in six degrees of freedom directions, and adjusting the position of the displacement sensor to be measured or the electromagnet of the proportional valve to be measured.

3. The device according to claim 1, characterized in that The control system further comprises a driver, and the motion controller is connected to the driver; The motion controller sends a control signal to the driver to drive the standard force sensor to move linearly toward the sensor mounting head or away from the sensor mounting head.

4. The device according to claim 1, characterized in that The control system also includes a signal conditioning circuit, a GPIB communication interface and a power supply module; The signal conditioning circuit is connected to the electrical measurement module, and the signal conditioning circuit is used to condition the signal collected by the electrical measurement module; The GPIB communication interface connects the signal conditioning circuit, the motion controller and the programmable power supply / drive circuit; The GPIB communication interface is used to respectively communicate the signal conditioning circuit, the motion controller and the programmable power supply / drive circuit with a host computer.

5. The device according to claim 1, characterized in that The electrical measurement module adopts high-precision 7 1 / 2-digit benchtop multimeter.

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