A test apparatus for a pneumatic control valve or actuator

Abstract

The utility model discloses a kind of test equipment for pneumatic control valve or actuator in the field of pneumatic actuator detection, including valve displacement measuring instrument and control cabinet;Control cabinet is delivered to pneumatic control valve or actuator and measures the pressure of compressed air, valve displacement measuring instrument measures the displacement of pneumatic control valve or actuator;The controller of control cabinet transmits pressure and displacement data to PC host computer by Ethernet, and PC host computer generates the detection report of pneumatic control valve or actuator.The utility model can improve the detection quality and efficiency of pneumatic actuator, improve the production efficiency of pneumatic actuator production enterprise, meet the increasing delivery requirement, solve the problem of low efficiency of factory inspection, stroke etc. rely on visual inspection, realize the digitization and intelligentization of production final inspection.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic actuator testing, and in particular to a testing device for pneumatic control valves or actuators. Background Technology

[0002] The research, development, testing, and factory inspection of pneumatic control valves or actuators require verification of compliance with national standards. Their performance indicators are mainly reflected in rated stroke deviation and endpoint deviation. Currently, rated stroke deviation is rarely measured or is performed visually; endpoint deviation is currently measured using pressure gauges. To improve the accuracy and efficiency of testing pneumatic control valves or actuators, it is necessary to develop a new testing device. Utility Model Content

[0003] To address the aforementioned problems in the existing technology, this utility model provides a testing device for pneumatic control valves or actuators, including a valve displacement measuring instrument and a control cabinet. The control cabinet delivers compressed air to the pneumatic control valve or actuator and measures the pressure of the compressed air. The valve displacement measuring instrument measures the displacement of the pneumatic control valve or actuator. Based on the pressure and displacement data, a test report for the pneumatic control valve or actuator can be quickly generated.

[0004] The technical solution of this utility model is as follows:

[0005] A testing device for pneumatic control valves or actuators, comprising a valve displacement measuring instrument and a control cabinet;

[0006] The valve displacement measuring instrument includes a crab claw clamp 17 and a displacement sensor 13; the crab claw clamp 17 is clamped on the push rod of the pneumatic control valve or actuator and moves linearly together with the push rod; the displacement sensor 13 measures the displacement data of the crab claw clamp 17 and transmits the displacement data to the control cabinet.

[0007] The control cabinet includes an air inlet 1, a solenoid valve 1 2, a solenoid valve 2 3, a proportional valve 4, an air lock valve 5, a pressure sensor module 6, a controller 7, an air outlet 8, and an Ethernet interface 9.

[0008] Compressed air flows through inlet 1 to the inlets of solenoid valve 2, solenoid valve 3, and pressure sensor module 6 simultaneously; the outlet of solenoid valve 2 is connected to the inlet of proportional valve 4, and the outlet of proportional valve 4 is connected to the inlet of air lock valve 5; the outlet of solenoid valve 3 is connected to the SIG signal of air lock valve 5; the SIG signal is the control signal of air lock valve 5. When the external compressed air supply fails and stops, the air lock valve closes, keeping the valve position of proportional valve 4 in the position before the air supply was cut off.

[0009] The outlet of the air lock valve 5 is connected to both the pressure sensor module 6 and the air outlet 8; the air outlet 8 is connected to the pneumatic control valve or actuator, so that compressed air flows to the pneumatic control valve or actuator.

[0010] Pressure sensor module 6 measures the compressed air from air inlet 1 and air lock valve 5, and transmits the measured pressure data to controller 7; controller 7 receives pressure data from pressure sensor module 6 and displacement data from valve displacement measuring instrument, and transmits the pressure data and displacement data to PC host via Ethernet interface 9; PC host sends instructions to controller 7 via Ethernet, receives pressure data and displacement data, and generates test report;

[0011] The controller 7 controls the opening and closing of solenoid valve 2, solenoid valve 3, and the valve opening degree of proportional valve 4 according to the instructions of the PC host.

[0012] Furthermore, the valve displacement measuring instrument includes a column 10, a connector 11, an indicator light 12, a displacement sensor 13, a crossbar mounting plate 14, a crossbar 15, a longitudinal bar 16, a crab claw clamp 17, a first-hand-tightening nut 18, a cross-shaped fixing section 19, and a second-hand-tightening nut 20.

[0013] The column 10 is a long rod structure; the connector 11 is used to fix the column 10 so that the length direction of the column 10 is perpendicular to the horizontal plane.

[0014] The displacement sensor 13 includes a slide rail 21 and a measuring slider 22; the slide rail 21 is fixed on the column 10, and the length direction of the slide rail 21 is perpendicular to the horizontal plane; the measuring slider 22 moves linearly on the slide rail 21 and measures the displacement in the direction of movement.

[0015] The crossbar mounting plate 14 is fixed on the measuring slider 22; the second plum blossom hand-tightening nut 20 is fixed on the crossbar mounting plate 14; the crossbar 15 is a long rod structure, and the second plum blossom hand-tightening nut 20 fixes one end of the crossbar 15 to the crossbar mounting plate 14.

[0016] The longitudinal rod 16 is a long rod structure, and the plum blossom hand-tightening nut 18 fixes the crab claw clamp 17 to one end of the longitudinal rod 16; the cross fixing joint 19 fixes the longitudinal rod 16 to the cross rod 15;

[0017] The horizontal bar mounting plate 14, horizontal bar 15, vertical bar 16, crab claw clamp 17, plum blossom hand-tightening nut one 18, cross fixing joint 19, plum blossom hand-tightening nut two 20 and measuring slider 22 form a whole, called the measuring mechanism; the measuring mechanism moves linearly in the vertical direction on the slide rail 21;

[0018] After the crab claw clamp 17 clamps the push rod of the pneumatic control valve or actuator, the measuring mechanism moves up and down together with the push rod; the displacement sensor 13 measures the displacement of the measuring mechanism.

[0019] The indicator light 12 is connected to the control cabinet and switches between on and off states according to the instructions of the controller 7; when the indicator light 12 is on, it means that the displacement sensor 13 is running.

[0020] Furthermore, the column 10 is cut from industrial aluminum profiles.

[0021] Furthermore, the connector 11 is a right-angle connector suitable for aluminum profiles.

[0022] Furthermore, the height range of the push rod when it moves up and down is smaller than the height range of the measuring mechanism when it moves up and down.

[0023] Furthermore, the displacement sensor 4 is an optical grating ruler or a magnetic grating ruler.

[0024] The beneficial technical effects of this utility model are as follows:

[0025] (1) This equipment uses a self-developed pressure sensor. Through a specially designed air circuit system, it can detect the pressure of the air source and air chamber in real time, with a detection accuracy of ±150Pa. At the same time, it uses a displacement sensor. Through a specially designed connection system, it can detect the displacement of the valve stem of the actuator in real time, with a detection accuracy of ±0.01mm.

[0026] (2) Real-time interaction is achieved by using a general-purpose data acquisition card and sensor to record and upload pressure and displacement data; the host computer software draws and presents pressure and displacement curves in real time based on these data, and can directly generate judgment criteria in combination with the numerical requirements in the standard, without relying on manual judgment.

[0027] (3) In addition to the air chamber sealing, rated stroke deviation, and start and end point deviation / pressure, this equipment can also perform sensor calibration, step response, dead zone, performance, housing, switch action / time / life tests, which greatly enriches the test items of pneumatic actuators and further improves the reliability of products leaving the factory.

[0028] (4) After the test is completed, the test data can be saved on the local computer and a data test report can be generated; the test data can also be exported directly, copied or uploaded via USB flash drive.

[0029] (5) This equipment can improve the production efficiency of pneumatic actuator manufacturers, meet the increasing delivery requirements, solve the problems of low factory inspection efficiency and reliance on visual inspection for stroke, and realize the digitalization and intelligentization of final inspection. Attached Figure Description

[0030] Figure 1 This is a front view of the control cabinet;

[0031] Figure 2 This is a side view of the control cabinet;

[0032] Figure 3 This is the schematic diagram of the control cabinet;

[0033] Figure 4 This is a front view of the valve displacement measuring instrument;

[0034] Figure 5 This is a top view of the valve displacement measuring instrument.

[0035] In the diagram, the correspondence between component names and attached drawing numbers is as follows: 1. Air inlet; 2. Solenoid valve one; 3. Solenoid valve two; 4. Proportional valve; 5. Air lock valve; 6. Pressure sensor module; 7. Controller; 8. Air outlet; 9. Ethernet interface; 10. Column; 11. Connector; 12. Indicator light; 13. Displacement sensor; 14. Crossbar mounting plate; 15. Crossbar; 16. Vertical bar; 17. Crab claw clamp; 18. Torx nut one; 19. Cross joint; 20. Torx nut two; 21. Slide rail; 22. Measuring slider; 23. Cabinet; 24. Partition; 25. Valve seat; 26. Support plate; 27. Rotary switch; 28. Push button switch; 29. ​​Emergency stop switch; 30. Main power interface; 31. Indicator light interface; 32. Displacement sensor interface. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] like Figures 1-5 As shown, the embodiment consists of a valve displacement measuring instrument and a control cabinet.

[0038] like Figure 1 , 2 As shown, the control cabinet includes an air inlet 1, a solenoid valve 1 2, a solenoid valve 2 3, a proportional valve 4, an air lock valve 5, a pressure sensor module 6, a controller 7, an air outlet 8, an Ethernet interface 9, a cabinet body 23, a partition 24, a valve seat 25, a tray 26, a rotary switch 27, a push-button switch 28, an emergency stop switch 29, a main power interface 30, an indicator light interface 31, and a displacement sensor interface 32.

[0039] like Figure 1As shown, partition 24 is installed inside cabinet 23; proportional valve 4, airlock valve 5, controller 7, valve seat 25, and tray 26 are all installed on partition 24; solenoid valve 1 2 and solenoid valve 2 3 are both installed on valve seat 25; pressure sensor module 6 is installed on tray 26.

[0040] like Figure 2 As shown, air inlet 1, air outlet 8, Ethernet interface 9, rotary switch 27, push button switch 28, emergency stop switch 29, main power supply 30, indicator light interface 31, and displacement sensor interface 32 are installed on the side of cabinet 23.

[0041] like Figure 3 As shown, compressed air flows through inlet 1 to the inlets of solenoid valve 2, solenoid valve 3, and pressure sensor module 6; the outlet of solenoid valve 2 is connected to the inlet of proportional valve 4, and the outlet of proportional valve 4 is connected to the inlet of air lock valve 5; the outlet of solenoid valve 3 is connected to the SIG signal of air lock valve 5. The SIG signal is the control signal of air lock valve 5. When the external compressed air supply fails and stops, the air lock valve closes, keeping the valve position of proportional valve 4 in the position before the air supply was cut off.

[0042] The outlet of the air lock valve 5 is connected to the pressure sensor module 6 and the air outlet 8; the air outlet 8 is connected to the pneumatic control valve or actuator, so that compressed air flows to the pneumatic control valve or actuator.

[0043] Pressure sensor module 6 measures the compressed air from air inlet 1 and air lock valve 5, and transmits the measured pressure data to controller 7. Controller 7 receives pressure data from pressure sensor module 6 and displacement data from valve displacement measuring instrument, and transmits the pressure data and displacement data to PC host via Ethernet interface 9. PC host sends instructions to controller 7 via Ethernet, receives pressure data and displacement data, and generates test report.

[0044] The controller 7 controls the opening and closing of solenoid valve 2, solenoid valve 3, and the valve opening degree of proportional valve 4 according to the instructions of the PC host.

[0045] The structure of the valve displacement measuring instrument is as follows Figure 4 , 5 As shown, it consists of a column 10, a connector 11, an indicator light 12, a displacement sensor 13, a crossbar mounting plate 14, a crossbar 15, a longitudinal bar 16, a crab claw clamp 17, a first-hand-tightening nut 18, a cross-shaped fixing section 19, and a second-hand-tightening nut 20.

[0046] The column 10 is cut from industrial aluminum profiles. The connector 11 is a right-angle connector suitable for aluminum profiles, used to fix the column 10 so that the length direction of the column 10 is perpendicular to the horizontal plane.

[0047] The displacement sensor 13 is a grating ruler, including a slide rail 21 and a measuring slider 22. The measuring slider 22 can move linearly on the slide rail 21. The design concept of this embodiment is to select a suitable connecting device to connect the push rod of the pneumatic control valve or actuator to the measuring slider 22, thereby converting the movement of the push rod into the movement of the measuring slider 22.

[0048] The slide rail 21 is fixed to the column 10, and the length direction of the slide rail 21 is perpendicular to the horizontal plane. The measuring slider 22 can move linearly on the slide rail 21 and can measure the displacement in the direction of movement.

[0049] The crossbar mounting plate 14 is fixed to the measuring slider 22. A second nut 20 is fixed to the crossbar mounting plate 14. The crossbar 15 is a long rod structure, and the second nut 20 fixes one end of the crossbar 15 to the crossbar mounting plate 14. After fixing, the crossbar 15 is parallel to the horizontal plane.

[0050] The longitudinal rod 16 is a long rod structure, and the crab claw clamp 17 is fixed to one end of the longitudinal rod 16 by the plum blossom hand-tightening nut 18. The cross-shaped fixing joint 19 fixes the longitudinal rod 16 to the cross rod 15, so that the longitudinal rod 16 is parallel to the horizontal plane and not parallel to the cross rod 15.

[0051] The crossbar mounting plate 14, crossbar 15, longitudinal bar 16, crab claw clamp 17, plum blossom hand-tightening nut one 18, cross fixing joint 19, plum blossom hand-tightening nut two 20, and measuring slider 22 form a whole, called the measuring mechanism. The measuring mechanism moves linearly along the vertical direction on the slide rail 21.

[0052] After the crab claw clamp 17 clamps the push rod of the pneumatic control valve or actuator, the measuring mechanism moves up and down along with the push rod. The displacement sensor 13 can measure the displacement of the measuring mechanism.

[0053] Before starting the measurement, adjust the installation height of the slide rail 21 according to the height of the push rod so that the height range when the push rod moves up and down is less than the height range when the measuring mechanism moves up and down; otherwise, the push rod or the embodiment may be damaged.

[0054] The displacement sensor 13 is connected to the encoder interface on the controller 7, which is then connected to the PC host via Ethernet. The air source is first connected to the pressure sensor module 6, and then to the air chamber of the pneumatic control valve or actuator.

[0055] After installation, turn on the power and air supply, and control the push rod movement through the test program on the PC host. Displacement sensor 4 collects displacement data in real time, pressure sensor module 6 collects air supply and air chamber pressure in real time, and controller 7 uploads displacement data to the PC host in real time. The PC host plots the test displacement curve based on time points, and outputs a test report according to the requirements of relevant national standards.

[0056] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, and for those of ordinary skill in the art, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details.

Claims

1. A testing device for pneumatic control valves or actuators, characterized in that: Includes valve displacement measuring instrument and control cabinet; The valve displacement measuring instrument includes a crab claw clamp (17) and a displacement sensor (13); the crab claw clamp (17) is clamped on the push rod of the pneumatic control valve or actuator and moves linearly together with the push rod; the displacement sensor (13) measures the displacement data of the crab claw clamp (17) and transmits the displacement data to the control cabinet; The control cabinet includes an air inlet (1), a solenoid valve one (2), a solenoid valve two (3), a proportional valve (4), an air lock valve (5), a pressure sensor module (6), a controller (7), an air outlet (8), and an Ethernet interface (9); Compressed air flows through the inlet (1) to the inlet of solenoid valve 1 (2), solenoid valve 2 (3), and pressure sensor module (6); the outlet of solenoid valve 1 (2) is connected to the inlet of proportional valve (4), and the outlet of proportional valve (4) is connected to the inlet of air lock valve (5); the outlet of solenoid valve 2 (3) is connected to the SIG signal of air lock valve (5); the SIG signal is the control signal of air lock valve (5). When the external compressed air fails and stops supplying air, the air lock valve closes, so that the valve position of proportional valve (4) remains at the position before the air supply is cut off. The outlet of the air lock valve (5) is connected to both the pressure sensor module (6) and the air outlet (8); the air outlet (8) is connected to the pneumatic control valve or actuator, so that compressed air flows to the pneumatic control valve or actuator. The pressure sensor module (6) measures the compressed air from the air inlet (1) and the air lock valve (5) and transmits the measured pressure data to the controller (7); the controller (7) receives the pressure data from the pressure sensor module (6) and the displacement data from the valve displacement measuring instrument, and transmits the pressure data and displacement data to the PC host via the Ethernet interface (9); the PC host sends instructions to the controller (7) via Ethernet, receives the pressure data and displacement data, and generates a test report; The controller (7) controls the opening and closing of solenoid valve one (2), the opening and closing of solenoid valve two (3), and the valve opening degree of proportional valve (4) according to the instructions of the PC host.

2. The testing equipment for pneumatic control valves or actuators according to claim 1, characterized in that: The valve displacement measuring instrument includes a column (10), a connector (11), an indicator light (12), a displacement sensor (13), a crossbar mounting plate (14), a crossbar (15), a longitudinal bar (16), a crab claw clamp (17), a first-hand-tightening nut (18), a cross-shaped fixing section (19), and a second-hand-tightening nut (20). The column (10) is a long rod structure; the connector (11) is used to fix the column (10) so that the length direction of the column (10) is perpendicular to the horizontal plane; The displacement sensor (13) includes a slide rail (21) and a measuring slider (22); the slide rail (21) is fixed on the column (10), and the length direction of the slide rail (21) is perpendicular to the horizontal plane; the measuring slider (22) moves linearly on the slide rail (21) and measures the displacement in the direction of movement; The crossbar mounting plate (14) is fixed on the measuring slider (22); the second plum blossom hand-tightening nut (20) is fixed on the crossbar mounting plate (14); the crossbar (15) is a long rod structure, and the second plum blossom hand-tightening nut (20) fixes one end of the crossbar (15) to the crossbar mounting plate (14); The longitudinal rod (16) is a long rod structure, and the plum blossom hand-tightening nut (18) fixes the crab claw clamp (17) to one end of the longitudinal rod (16); the cross fixing joint (19) fixes the longitudinal rod (16) to the cross rod (15); The crossbar mounting plate (14), crossbar (15), vertical bar (16), crab claw clamp (17), plum blossom hand-tightening nut one (18), cross fixing section (19), plum blossom hand-tightening nut two (20) and measuring slider (22) form a whole, called the measuring mechanism; the measuring mechanism moves linearly in the vertical direction on the slide rail (21); After the crab claw clamp (17) clamps the push rod of the pneumatic control valve or actuator, the measuring mechanism moves up and down together with the push rod; the displacement sensor (13) measures the displacement of the measuring mechanism; The indicator light (12) is connected to the control cabinet and switches between on and off states according to the instructions of the controller (7); when the indicator light (12) is on, it means that the displacement sensor (13) is running.

3. A testing device for a pneumatic control valve or actuator according to claim 2, characterized in that The column (10) is cut from industrial aluminum profiles.

4. A testing device for a pneumatic control valve or actuator according to claim 2, characterized in that The connector (11) is a right-angle connector suitable for aluminum profiles.

5. A testing device for a pneumatic control valve or actuator according to claim 2, characterized in that The height range of the push rod when it moves up and down is less than the height range of the measuring mechanism when it moves up and down.

6. A testing device for a pneumatic control valve or actuator according to claim 2, characterized in that The displacement sensor (13) is an optical grating ruler or a magnetic grating ruler.

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