A valve switch time measuring device

Abstract

The present invention relates to the field of valve measurement, and discloses a valve opening and closing time measurement device, including a workbench. A first mounting plate is fixedly connected to the top of the workbench. A hydraulic rod is fixedly arranged on the top of the first mounting plate. The output end of the hydraulic rod is fixedly provided with a second mounting plate. A closed detection window is arranged at the bottom of the second mounting plate. Infrared emission and reception diodes are uniformly arranged inside the closed detection window. Connecting blocks are uniformly and fixedly connected to one side of the second mounting plate. A clamping structure is arranged at the bottom of the connecting block. A third mounting plate is fixedly connected to one side of the top of the workbench. The electric suction cup is driven by the driving structure to move up and down or left and right, so as to adsorb the valve stem of valves with different diameters, and then drive the valve stem to move inside the valve to perform the opening and closing stroke operation. The closed detection window is driven by the hydraulic rod to move up or down.

Description

Technical Field

[0001] The present invention relates to the technical field of valve measurement, and particularly to a device for measuring the opening and closing time of a valve. Background Art

[0002] In modern industrial control systems, valves, as one of the core components, play a crucial role in the process of pipeline medium transmission. To ensure the stability and safety of the system, it is necessary to accurately evaluate the key performance indicators of valves. Among them, the opening and closing time of valves is an extremely important parameter, which directly affects the safety and efficiency of the entire process. However, there are still many challenges in measuring this parameter at present. Traditional methods usually rely on manual timing or simple electronic triggering mechanisms, and these means often cannot meet the high-precision requirements. With the development of intelligent manufacturing technology, the industry has gradually realized the importance of automated and intelligent measurement tools, which not only improve work efficiency but also reduce the risk of errors introduced by human factors. In addition, the market's demand for higher precision and faster speed feedback is increasing day by day, which promotes the research and application of new technologies. Therefore, it is of great significance to research and develop a set of efficient and reliable valve opening and closing time measurement systems.

[0003] Traditional valve opening and closing time measurement devices mainly rely on proximity switches to achieve positioning functions. When the target object reaches the preset position, a signal is sent to complete the recording operation. This method has a simple structure and low cost. In the early stage of industrial development, due to its simplicity and ease of operation, it was widely used in some scenarios with low requirements for measurement accuracy, and to a certain extent, it met the basic production needs. However, in actual use, the accuracy decreases due to unstable trigger levels, affecting the measurement accuracy of valves. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a device for measuring the opening and closing time of a valve, which solves the problem that traditional valve opening and closing time measurement devices mainly rely on proximity switches to achieve positioning functions. When the target object reaches the preset position, a signal is sent to complete the recording operation, and in actual use, the accuracy decreases due to unstable trigger levels, affecting the measurement accuracy of valves.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A valve switch time measuring device, including a workbench, a first mounting plate is fixedly connected to the top of the workbench, a hydraulic rod is fixedly arranged on the top of the first mounting plate, the output end of the hydraulic rod is fixedly provided with a second mounting plate, a closed detection window is arranged at the bottom of the second mounting plate, infrared emission and reception diodes are uniformly arranged inside the closed detection window, connection blocks are uniformly fixedly connected to one side of the second mounting plate, a clamping structure is arranged at the bottom of the connection block, a third mounting plate is fixedly connected to one side of the top of the workbench, a driving structure is arranged on one side of the third mounting plate, and an electric suction cup is fixedly arranged on one side of the driving structure.

[0006] Preferably, the clamping structure includes a connecting column, the top end of the connecting column is fixedly connected to the bottom of the connection block, a piston is fixedly arranged at the bottom end of the connecting column, and a cylinder body is arranged on the outer wall of the piston.

[0007] Preferably, the bottom of the cylinder body is fixedly arranged on the top of the workbench, an air pipe is arranged at the exhaust port of the cylinder body, and one end of the air pipe far away from the cylinder body is connected to an airbag.

[0008] Preferably, a limiting plate is fixedly connected to one side of the airbag, the bottom of the limiting plate is fixedly connected to the top of the workbench, and T-shaped sliding grooves are symmetrically arranged on the upper surface of the workbench.

[0009] Preferably, a clamping plate is arranged on the other side of the airbag, T-shaped sliders are symmetrically fixedly connected to the bottom of the clamping plate, and the T-shaped sliders are slidably connected to the T-shaped sliding grooves on the workbench.

[0010] Preferably, anti-slip blocks are uniformly fixedly connected to one side of the clamping plate away from the airbag, and anti-slip grooves are uniformly arranged on one side of the anti-slip blocks away from the clamping plate.

[0011] Preferably, the driving structure includes an electric slide rail, one side of the electric slide rail is fixedly arranged on one side of the third mounting plate, a first slider is arranged at the output end of the electric slide rail, a protective box is fixedly connected to one side of the first slider, heat dissipation holes are uniformly opened on the outer wall of the protective box, a through hole is opened on one side of the protective box away from the first slider, and a reduction motor is fixedly arranged on the top inner wall of the protective box.

[0012] Preferably, a worm is fixedly arranged at the output end of the reduction motor, one end of the worm is rotatably connected inside the protective box, the tooth end of the worm is meshed with a turbine, a lead screw is fixedly connected to the middle of the turbine, both ends of the lead screw are rotatably connected inside the protective box, and a second slider is threadedly connected to the outer wall of the lead screw.

[0013] Preferably, the outer wall of the second slider is slidably connected to the inner wall of the protective box, one side of the second slider is symmetrically fixedly connected with a connecting rod, the outer wall of the connecting rod is slidably connected in the through hole of the protective box, the end of the connecting rod away from the second slider is fixedly connected with a connecting plate, and one side of the connecting plate is fixedly set on one side of the electric suction cup.

[0014] Preferably, the bottom of the workbench is evenly and fixedly connected with supporting legs, and a control panel is provided on one side of the workbench.

[0015] Working principle: When in use, place the valve to be measured on the workbench, and then drive the second mounting plate to move up or down through the hydraulic rod, thereby driving the connecting block to move up or down, thereby driving the connecting column to move up or down, and then driving the piston to move inside the cylinder, so that the air inside the cylinder is sent into or out of the airbag through the air pipe, so that the airbag expands or contracts, and drives the clamping plate to slide in the T-shaped slide groove of the workbench through the T-shaped slider, moving closer or farther away from each other, thereby clamping and fixing the valve on the upper surface of the workbench, and preventing the valve from sliding through the anti-sliding block and the anti-slip groove, thereby enhancing the stability of the fixation. At the same time, the rise or fall of the second mounting plate drives the closed detection window to move up or down to meet the measurement needs of valves of different specifications.

[0016] Then, the electric slide rail drives the first slider to move up and down according to the diameter of the valve, thereby driving the protective box to move up and down, and then driving the electric suction cup to move up and down, so as to adjust the height position of the electric suction cup, dissipate heat through the heat dissipation holes, and drive the worm to rotate inside the protective box through the reduction motor, thereby causing the turbine to rotate, driving the screw rod to rotate inside the protective box, thereby driving the second slider to move horizontally left and right inside the protective box, causing the connecting rod to slide in the through hole of the protective box, thereby driving the connecting plate to move horizontally left and right, and then driving the electric suction cup to move horizontally, and the electric suction cup is used to adsorb and fix the valve stem of the valve, thereby driving the valve stem to move inside the valve to perform the opening and closing stroke operation.

[0017] At the same time, the infrared transmitting and receiving diode is used to capture the displacement of the valve stem when the valve stem moves, thereby generating a corresponding pulse signal. After being processed by the digital filter network, effective information reflecting the change in valve stem displacement is extracted, and then the time consumed for the valve to open and close is calculated to complete the measurement.

[0018] The present invention provides a valve opening and closing time measuring device, which has the following beneficial effects:

[0019] 1. The present invention drives an electric suction cup to move up and down or left and right through a driving structure, so as to adsorb the valve stem of valves with different diameters, and then drive the valve stem to move inside the valve to perform the opening and closing stroke operation. The hydraulic rod drives the closed detection window to move up or down to meet the measurement requirements of valves with different specifications. When the valve stem moves, the infrared emission and reception diodes capture the displacement of the valve stem, generating corresponding pulse signals. After being processed by a digital filtering network, the effective information reflecting the displacement change of the valve stem can be extracted, and then the time duration of the valve opening and closing can be calculated.

[0020] 2. The present invention drives a connecting column to move up or down through a connecting block, causing the piston to move inside the cylinder block, and then causing the airbag to expand or contract, driving the clamping plates to move closer to or away from each other, so as to clamp and fix or release the clamping of the valve on the upper surface of the workbench. The anti-slip blocks and anti-slip grooves prevent the valve from sliding, enhancing the stability of fixation, and thus preventing the valve from shaking during measurement, which affects the measurement accuracy.

[0021] 3. According to the diameter of the valve, the present invention drives the electric suction cup to move up and down through an electric slide rail to adjust the height position of the electric suction cup. The reduction motor drives the worm to rotate inside the protective box, driving the second slider to move horizontally left and right inside the protective box, causing the connecting rod to slide in the through hole of the protective box, and then driving the electric suction cup to move horizontally. The electric suction cup adsorbs and fixes the valve stem of the valve, and then drives the valve stem to move inside the valve to perform the opening and closing stroke operation, facilitating measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0023] Figure 2 is a partial structural schematic diagram of the second mounting plate of the present invention;

[0024] Figure 3 is a schematic diagram of the internal structure of the closed detection window of the present invention;

[0025] Figure 4 is a partial structural schematic diagram of the connecting column of the present invention;

[0026] Figure 5 is an exploded schematic diagram of the partial structure of the airbag of the present invention;

[0027] Figure 6 is a partial structural schematic diagram of the T-shaped sliding groove of the present invention;

[0028] Figure 7 is a partial structural schematic diagram of the third mounting plate of the present invention;

[0029] Figure 8 Schematic diagram of the internal structure of the protective box of the present invention.

[0030] Among them, 1. Workbench; 2. Support leg; 3. Control panel; 4. First mounting plate; 5. Hydraulic rod; 6. Second mounting plate; 7. Connecting block; 8. Enclosed detection window; 9. Connecting column; 10. Cylinder block; 11. Third mounting plate; 12. Limiting plate; 13. Air pipe; 14. Clamping plate; 15. Anti-slip block; 16. T-shaped slider; 17. Anti-slip groove; 18. Infrared emission and reception diode; 19. Piston; 20. Airbag; 21. T-shaped chute; 22. Electric slide rail; 23. First slider; 24. Protective box; 25. Heat dissipation hole; 26. Through hole; 27. Connecting rod; 28. Connecting plate; 29. Electric suction cup; 30. Reducing motor; 31. Worm; 32. Turbine; 33. Lead screw; 34. Second slider. Specific embodiments

[0031] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to the appended Figure 1 - appended Figure 8 , an embodiment of the present invention provides 1. A valve switch time measuring device, including a workbench 1, a first mounting plate 4 is fixedly connected to the top of the workbench 1, a hydraulic rod 5 is fixedly arranged on the top of the first mounting plate 4, the output end of the hydraulic rod 5 is fixedly provided with a second mounting plate 6, a closed detection window 8 is arranged at the bottom of the second mounting plate 6, infrared emission and reception diodes 18 are uniformly arranged inside the closed detection window 8, a connecting block 7 is uniformly fixedly connected to one side of the second mounting plate 6, a clamping structure is arranged at the bottom of the connecting block 7, a third mounting plate 11 is fixedly connected to one side of the top of the workbench 1, a driving structure is arranged on one side of the third mounting plate 11, and an electric suction cup 29 is fixedly arranged on one side of the driving structure.

[0033] Specifically, the workbench 1 is the basic bearing platform of the entire device, providing a stable installation foundation for other components. It has good rigidity and stability, can effectively resist the vibration and impact that may occur during the measurement process, and ensure the accuracy of the measurement. Place the valve on the workbench 1. Through the operation of the driving structure, drive the electric suction cup 29 to move up and down or left and right, so as to adsorb the valve stem of valves with different diameters, and then drive the valve stem to move inside the valve to perform the opening and closing stroke operation. Install the first mounting plate 4 through the workbench 1, install the hydraulic rod 5 through the first mounting plate 4, and through the operation of the hydraulic rod 5, drive the second mounting plate 6 to move up or down, and then drive the closed detection window 8 to move up or down to meet the measurement requirements of valves with different specifications.

[0034] The closed detection window 8 is made of a material with high strength and good light transmittance, which can not only effectively protect the internal infrared emission and reception diodes 18, but also ensure the stable transmission of infrared signals. The infrared emission and reception diodes 18 are evenly distributed inside the closed detection window 8 and can accurately detect the displacement change of the valve stem. It uses a highly sensitive photosensitive material and can quickly respond to the slightest displacement of the valve stem, generating corresponding electrical signal changes. When the valve stem moves, use the infrared emission and reception diodes 18 to capture the displacement amount of the valve stem, thereby generating corresponding pulse signals. After being processed by the digital filtering network, the effective information reflecting the displacement change of the valve stem can be extracted, and then the time duration of the valve opening and closing can be calculated. At the same time, using the closed design of the closed detection window 8 can effectively avoid the interference of external light, thus completing the measurement, and solving the problem that the traditional valve opening and closing time measurement device mainly relies on proximity switches to achieve the positioning function. When the target object reaches the preset position, it emits a signal to complete the recording operation. In actual use, due to the unstable trigger level, the accuracy decreases, affecting the measurement accuracy of the valve.

[0035] At the same time, the rise or fall of the second mounting plate 6 drives the connecting block 7 to rise or fall, thereby driving the clamping structure to operate, and using the clamping structure to clamp and fix the valve on the upper surface of the workbench 1 to prevent shaking during the measurement and affect the measurement accuracy.

[0036] Please refer to the appendix Figure 1 - appendix Figure 6 As shown in the figure, the clamping structure includes a connecting column 9. The top end of the connecting column 9 is fixedly connected to the bottom of the connecting block 7. The bottom end of the connecting column 9 is fixedly provided with a piston 19, and the outer wall of the piston 19 is provided with a cylinder block 10; the bottom of the cylinder block 10 is fixedly provided on the top of the workbench 1, and the exhaust port of the cylinder block 10 is provided with an air pipe 13. One end of the air pipe 13 away from the cylinder block 10 is connected to an air bag 20.

[0037] Specifically, through the connection between the connecting column 9 and the connecting block 7, when the connecting block 7 rises or falls, it drives the connecting column 9 to rise or fall, and further drives the piston 19 to move inside the cylinder block 10. The cylinder block 10 is fixed by the workbench 1 to ensure its stability. Thus, the air inside the cylinder block 10 is sent into or drawn out of the airbag 20 through the air pipe 13, and then the airbag 20 expands or contracts. A high-precision sealing fit is adopted between the piston 19 and the inner wall of the cylinder block 10, which can not only ensure the smooth sliding of the piston 19 inside the cylinder block 10, but also prevent gas leakage. The air pipe 13 arranged at the exhaust port of the cylinder block 10 is made of a material with good flexibility and strong compressive capacity to ensure that gas can flow smoothly between the cylinder block 10 and the airbag 20.

[0038] Please refer to the attached Figure 5 and the attached Figure 6 As shown in the figure, a limiting plate 12 is fixedly connected to one side of the airbag 20, and the bottom of the limiting plate 12 is fixedly connected to the top of the workbench 1. T-shaped sliding grooves 21 are symmetrically arranged on the upper surface of the workbench 1; a clamping plate 14 is arranged on the other side of the airbag 20. T-shaped sliders 16 are symmetrically and fixedly connected to the bottom of the clamping plate 14, and the T-shaped sliders 16 are slidably connected in the T-shaped sliding grooves 21 of the workbench 1; anti-slip blocks 15 are evenly and fixedly connected to the side of the clamping plate 14 away from the airbag 20, and anti-slip grooves 17 are evenly arranged on the side of the anti-slip blocks 15 away from the clamping plate 14.

[0039] Specifically, one side of the airbag 20 is fixedly connected to the limiting plate 12 by welding, and the bottom of the limiting plate 12 is fixed to the top of the workbench 1, which plays an accurate limiting role in the expansion and contraction of the airbag 20. Through the sliding of the T-shaped sliders 16 in the T-shaped sliding grooves 21 of the workbench 1, the expansion or contraction of the airbag 20 is utilized to drive the clamping plate 14 to move closer to or away from each other on the top of the workbench 1, so as to clamp and fix and release the clamping of the valve on the upper surface of the workbench 1. The anti-slip blocks 15 are made of rubber materials with a high coefficient of friction, and the anti-slip grooves 17 evenly arranged on its surface further increase the friction force with the valve, preventing the valve from sliding and enhancing the stability of the fixation, so as to prevent the valve from shaking during measurement and affecting the measurement accuracy.

[0040] Please refer to the attached Figure 7 and the attached Figure 8 As shown in the figure, the driving structure includes an electric slide rail 22. One side of the electric slide rail 22 is fixedly arranged on one side of the third mounting plate 11. The output end of the electric slide rail 22 is provided with a first slider 23. One side of the first slider 23 is fixedly connected to a protective box 24. Heat dissipation holes 25 are evenly opened on the outer wall of the protective box 24. A through hole 26 is opened on the side of the protective box 24 away from the first slider 23. A reduction motor 30 is fixedly arranged on the top of the inner wall of the protective box 24.

[0041] Specifically, the third mounting plate 11 functions to mount the electric slide rail 22. The protective box 24 fixedly connected to one side of the first slider 23 can not only protect components such as the internal reduction motor 30, but also play a certain role in electromagnetic shielding, reducing the influence of external electromagnetic interference on the operation of the equipment. The heat dissipation holes 25 uniformly opened on the outer wall of the protective box 24 adopt a special heat dissipation design, which can effectively dissipate the heat generated by the reduction motor 30 during operation, ensuring the normal operating temperature of the equipment. Through the setting of the first slider 23, the protective box 24 can be driven to move up and down according to needs, and then drive the electric suction cup 29 to move up and down. Thus, when the diameter of the valve is different, the height position of the electric suction cup 29 can be adjusted, and the valve stem of the valve can be adsorbed and fixed by the electric suction cup 29. Through the setting of the heat dissipation holes 25, heat dissipation is carried out, and the reduction motor 30 is installed through the protective box 24.

[0042] Please refer to the attached Figure 7 、attached Figure 8 , a worm 31 is fixedly arranged at the output end of the reduction motor 30. One end of the worm 31 is rotatably connected inside the protective box 24. The tooth end of the worm 31 is meshed with a turbine 32. A lead screw 33 is fixedly connected to the middle of the turbine 32. Both ends of the lead screw 33 are rotatably connected inside the protective box 24. A second slider 34 is threadedly connected to the outer wall of the lead screw 33; the outer wall of the second slider 34 is slidably connected to the inner wall of the protective box 24. Connecting rods 27 are symmetrically and fixedly connected to one side of the second slider 34. The outer walls of the connecting rods 27 are slidably connected inside the through holes 26 of the protective box 24. One end of the connecting rod 27 far from the second slider 34 is fixedly connected to a connecting plate 28. One side of the connecting plate 28 is fixedly arranged on one side of the electric suction cup 29.

[0043] Specifically, the worm 31 fixedly arranged at the output end of the reduction motor 30 has a high meshing precision with the turbine 32, enabling efficient power transmission and precise motion control. The lead screw 33 fixedly connected to the middle of the turbine 32 is rotatably connected to both ends inside the protective box 24 through bearings, ensuring the stability and concentricity of the lead screw 33 during rotation. The second slider 34 threadedly connected to the outer wall of the lead screw 33, through the threaded fit with the lead screw 33, can convert the rotation of the lead screw 33 into a stable linear motion. The outer wall of the second slider 34 and the inner wall of the protective box 24 adopt a sliding fit to ensure the smoothness of the second slider 34 during movement. The connecting rods 27 symmetrically and fixedly connected to one side of the second slider 34 cooperate with the through holes 26 of the protective box 24 to ensure the accuracy of the connecting rods 27 during sliding. The connecting plate 28 fixedly connected to one end of the connecting rod 27 far from the second slider 34 is tightly fixedly connected to the electric suction cup 29 through bolts, ensuring the stability of the electric suction cup 29 during movement.

[0044] Through the operation of the reduction motor 30, the worm 31 is driven to rotate inside the protective box 24, thereby driving the turbine 32 to rotate, and then driving the lead screw 33 to rotate inside the protective box 24. Through the threaded connection between the second slider 34 and the lead screw 33, and the second slider 34 sliding on the inner wall of the protective box 24, the rotation of the lead screw 33 is utilized to drive the second slider 34 to move horizontally left and right inside the protective box 24, thereby driving the connecting rod 27 to slide in the through hole 26 of the protective box 24, driving the connecting plate 28 to move horizontally left and right, and then driving the electric suction cup 29 to move horizontally. The valve stem of the valve is adsorbed and fixed by the electric suction cup 29, thereby driving the valve stem to move inside the valve to perform the opening and closing stroke operation, thus facilitating the measurement.

[0045] Support legs 2 are evenly and fixedly connected to the bottom of the workbench 1, and a control panel 3 is arranged on one side of the workbench 1.

[0046] Specifically, the entire device is supported by the support legs 2 to ensure the stability of the device. The control panel 3 integrates a high-performance microprocessor chip and related peripheral circuits, which are responsible for controlling the operation of the device and overall logical operation processing, and displaying the final measurement results. The operator can set measurement parameters, start the measurement program, etc. through the control panel 3 to achieve convenient control of the entire measurement process.

[0047] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve switch time measuring device, comprising a workbench (1), characterized in that: A first mounting plate (4) is fixedly connected to the top of the workbench (1). A hydraulic rod (5) is fixedly arranged on the top of the first mounting plate (4). The output end of the hydraulic rod (5) is fixedly provided with a second mounting plate (6). A closed detection window (8) is arranged at the bottom of the second mounting plate (6). Infrared emission and reception diodes (18) are evenly arranged inside the closed detection window (8). Connecting blocks (7) are evenly and fixedly connected to one side of the second mounting plate (6). A clamping structure is arranged at the bottom of the connecting block (7). A third mounting plate (11) is fixedly connected to one side of the top of the workbench (1). A driving structure is fixedly arranged on one side of the third mounting plate (11). An electric suction cup (29) is fixedly arranged on one side of the driving structure; The clamping structure includes a connecting column (9). The top end of the connecting column (9) is fixedly connected to the bottom of the connecting block (7). A piston (19) is fixedly arranged at the bottom end of the connecting column (9). A cylinder block (10) is arranged on the outer wall of the piston (19); The driving structure includes an electric slide rail (22). One side of the electric slide rail (22) is fixedly arranged on one side of the third mounting plate (11). A first slider (23) is arranged at the output end of the electric slide rail (22). A protective box (24) is fixedly connected to one side of the first slider (23). Heat dissipation holes (25) are evenly formed in the outer wall of the protective box (24). A through hole (26) is formed in one side of the protective box (24) away from the first slider (23). A reduction motor (30) is fixedly arranged at the top of the inner wall of the protective box (24); A worm (31) is fixedly arranged at the output end of the reduction motor (30). One end of the worm (31) is rotatably connected inside the protective box (24). The tooth end of the worm (31) is meshed with a turbine (32). A lead screw (33) is fixedly connected to the middle of the turbine (32). The two ends of the lead screw (33) are rotatably connected inside the protective box (24). A second slider (34) is threadedly connected to the outer wall of the lead screw (33); The outer wall of the second slider (34) is slidably connected to the inner wall of the protective box (24). Connecting rods (27) are symmetrically and fixedly connected to one side of the second slider (34). The outer walls of the connecting rods (27) are slidably connected inside the through hole (26) of the protective box (24). One end of the connecting rod (27) away from the second slider (34) is fixedly connected to a connecting plate (28). One side of the connecting plate (28) is fixedly arranged on one side of the electric suction cup (29).

2. The valve switch time measuring device according to claim 1, wherein: The bottom of the cylinder block (10) is fixedly arranged on the top of the workbench (1). An air pipe (13) is arranged at the exhaust port of the cylinder block (10). One end of the air pipe (13) away from the cylinder block (10) is connected to an air bag (20).

3. A valve opening and closing time measuring device according to claim 2, characterized in that: A limiting plate (12) is fixedly connected to one side of the air bag (20). The bottom of the limiting plate (12) is fixedly connected to the top of the workbench (1). T-shaped sliding grooves (21) are symmetrically arranged on the upper surface of the workbench (1).

4. The valve switch time measuring device according to claim 3, characterized in that: On the other side of the airbag (20), a clamping plate (14) is provided. Symmetrically fixed to the bottom of the clamping plate (14) are T-shaped sliders (16), and the T-shaped sliders (16) are slidably connected in the T-shaped chutes (21) of the workbench (1).

5. A valve switch time measuring device according to claim 4, characterized in that: On the side of the clamping plate (14) away from the airbag (20), anti-slip blocks (15) are uniformly and fixedly connected. On the side of the anti-slip blocks (15) away from the clamping plate (14), anti-slip grooves (17) are uniformly provided.

6. The valve switch time measuring device according to claim 1, characterized in that: Uniformly and fixedly connected to the bottom of the workbench (1) are support legs (2), and on one side of the workbench (1) is provided a control panel (3).

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