A high-pressure pneumatic unit test bench

Abstract

The present application relates to the technical field of pneumatic unit test, and particularly relates to a high-pressure pneumatic unit test bench, which comprises a gas supply unit and a platform; further comprises a loading mechanism, a disc, a sliding sleeve seat, a ejector rod, a ball and a measuring mechanism, the loading mechanism is installed on the gas supply unit, the loading mechanism is used for loading a fixed end of a cylinder, the disc is concentrically installed at an end of a piston rod of the cylinder, the sliding sleeve seat is installed on the platform, one end of the ejector rod is slidingly installed on the sliding sleeve seat, the ejector rod is concentrically arranged with the axis of the piston rod of the cylinder, the ball is installed at the end of the ejector rod facing the disc, the measuring mechanism is installed on the ejector rod and the disc, the measuring mechanism is used for detecting the change amount of the relative position between the disc and the ejector rod, and the concentricity and the inclination angle of the piston rod of the cylinder in the extension and retraction process are detected according to the change amount; the real-time change amount of the spatial position of the end of the piston rod of the high-pressure cylinder is measured, the extension and retraction precision test of the piston rod is completed, and the practicability is good.

Description

Technical Field

[0001] This invention relates to the technical field of pneumatic unit testing, and in particular to a high-pressure pneumatic unit testing bench. Background Technology

[0002] High-pressure cylinders are the most commonly used high-pressure pneumatic units. To determine whether a high-pressure starting unit meets design requirements, various tests are required. Existing technologies disclose various test benches for pneumatic units. For example, Chinese utility model patent CN218956029U proposes a fully automatic cylinder test bench. This test bench includes a test bench base, with a first test component for testing cylinder break-in on top of the base. A second test component for testing cylinder thrust is connected to one side of the first test component, and a third test component for testing pressure holding capacity is connected to one side of the second test component. A touchscreen is located above the test bench base, and a PLC controller is installed inside the test bench base. The touchscreen controls the first, second, and third test components to test the cylinder via the PLC controller. Automatic testing of rodless cylinders avoids human error, completely frees up manpower, and can complete several test tasks simultaneously, improving testing efficiency.

[0003] In practical work, in addition to the above-mentioned conventional test items, it is also necessary to test the extension and retraction accuracy of the piston rod of the cylinder. However, there are few test benches in the existing technology that can test the extension and retraction accuracy of the piston rod of the high-pressure cylinder. Therefore, it would be practical to propose a test bench that can test the extension and retraction accuracy of the piston rod of the high-pressure cylinder based on the existing technology. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a high-pressure pneumatic unit test bench that can perform piston rod extension and retraction accuracy tests by measuring the real-time change in the spatial position of the piston rod end of a high-pressure cylinder.

[0005] This invention discloses a high-pressure pneumatic unit test bench, comprising an air supply unit and a platform. The platform is mounted on the air supply unit, which houses a high-pressure air system. It also includes a loading mechanism, a disc, a sliding sleeve, a push rod, ball bearings, and a measuring mechanism. The loading mechanism is mounted on the air supply unit and is used to load the fixed end of a cylinder. The disc is concentrically mounted on the piston rod end of the cylinder. The sliding sleeve is mounted on the platform, and one end of the push rod is slidably mounted on the sliding sleeve. The push rod and the piston rod of the cylinder are arranged concentrically. Ball bearings are mounted on the end of the push rod facing the disc. A measuring mechanism is mounted on the push rod and the disc. The measuring mechanism is used to detect the change in the relative position between the disc and the push rod, and to detect the concentricity and tilt angle of the piston rod during its extension and retraction based on this change. During operation, the fixed end of the high-pressure cylinder is mounted on the loading mechanism, and the disc is loaded... The piston rod of the high-pressure cylinder is attached to the end of the piston rod. The high-pressure air system in the air supply unit is connected to the high-pressure cylinder. The extension of the push rod causes the ball bearings to roll into contact with the end face of the disc. Pressure damping is applied to the push rod to keep the disc and ball bearings rolling during the extension of the piston rod of the high-pressure cylinder. The high-pressure cylinder is inflated, causing the piston rod to extend and push the disc and push rod to move. During the extension of the piston rod, due to the machining accuracy of the piston rod, the piston rod causes the disc to deviate on the vertical plane of the piston rod axis. At the same time, the end of the piston rod causes the disc to tilt, that is, the relative spatial position of the disc and the push rod changes. The measuring mechanism on the disc and the push rod measures the real-time change of the relative spatial position. Based on the change, the extension accuracy of the piston rod of the high-pressure cylinder is analyzed, thus completing the extension accuracy test of the piston rod of the high-pressure cylinder. It has good practicality.

[0006] Preferably, the measuring mechanism includes a magnet, multiple crossbeams, multiple magnetic sensors (first type), and multiple magnetic sensors (second type). The magnet is concentrically mounted on the end of the top rod. The multiple crossbeams are evenly mounted circumferentially on the disk and arranged perpendicularly to the disk. The multiple magnetic sensors (first type) are respectively mounted on the inner ends of the multiple crossbeams, and the multiple magnetic sensors (second type) are respectively mounted on the outer ends of the multiple crossbeams. When the ball bearing rolls into contact with the disk, the magnet is located between the multiple magnetic sensors (first type) and the multiple magnetic sensors (second type). At least three crossbeams, magnetic sensors (first type), and magnetic sensors (second type) are provided. The multiple magnetic sensors (first type) are located on one side of the magnet, and the multiple magnetic sensors (second type) are located on the other side of the magnet. The multiple magnetic sensors (first type) and the multiple magnetic sensors (second type) respectively detect the magnetic intensity value at their respective locations. When the end of the high-pressure cylinder piston rod eccentrically swings and tilts during the extension process, it causes the disk to swing and tilt, thereby changing the spatial position between the multiple magnetic sensors (first type) and the magnet, and between the multiple magnetic sensors (second type) and the magnet. The position of the multiple magnetic sensors is recorded in real time. The system analyzes the magnetic field strength values ​​detected by one and multiple magnetic sensors (two). It separately analyzes the values ​​of multiple magnetic sensors (one and two) in a set of data, and detects the relative position of the magnet and the center of the disk based on the increase or decrease in the values ​​of each magnetic sensor (one and two). For example, if one magnetic sensor (one) increases and the other decreases, the piston rod of the high-pressure cylinder shifts towards the magnetic sensor (one) with the decreasing value, thus obtaining the concentricity data of the high-pressure cylinder piston rod's extension. Simultaneously, it analyzes the values ​​of magnetic sensors (one and two) located on the same crossbeam in a set of data, and detects the tilt state of the push rod and the disk based on the increase or decrease in the values ​​of the magnetic sensors (one and two). For example, if the value of magnetic sensor (one) increases and the value of magnetic sensor (two) decreases, the end of the high-pressure cylinder piston rod tilts outwards towards the crossbeam, thus obtaining the tilt angle data of the high-pressure cylinder piston rod's extension. This achieves non-contact measurement and has good practicality.

[0007] Preferably, the device further includes a mounting plate, a threaded tube, multiple clamping blocks, and a threaded clamping sleeve. The mounting plate is mounted on the end face of the disc facing the loading mechanism. The threaded tube is mounted on the mounting plate. The outer wall of the threaded tube has external threads. The threaded tube is concentric with the disc. Multiple grooves are evenly arranged on the side wall of the threaded tube. Multiple clamping blocks are slidably mounted in the multiple grooves of the threaded tube. Guide slopes are provided on the outer wall of the end of the multiple clamping blocks facing the loading mechanism. The threaded clamping sleeve is rotatably screwed to the external threads of the threaded tube through internal threads. Guide wedge surfaces matching the multiple clamping blocks are provided on the inner wall of the end of the threaded clamping sleeve facing the mounting plate. After the fixed end of the high-pressure cylinder is mounted on the loading mechanism, the threaded tube is fitted onto the end of the piston rod of the high-pressure cylinder. By rotating the threaded clamping sleeve, the threaded clamping sleeve moves towards the mounting plate under the action of the threads, causing the guide wedge surfaces of the threaded clamping sleeve to press against the guide slopes of the multiple clamping blocks, thereby pushing the multiple clamping blocks into the threaded tube. This allows the multiple clamping blocks to concentrically clamp the end of the piston rod of the high-pressure cylinder. The operation is simple and practical.

[0008] Preferably, it also includes a connecting plate, which is concentrically mounted on the end face of the disc facing the loading mechanism, and the mounting plate is detachably mounted on the connecting plate; by setting the connecting plate, it is convenient to disassemble and assemble the mounting plate, and also convenient to install other connecting parts, so as to adapt to different piston rod styles, and has good versatility.

[0009] Preferably, it also includes a grating ruler and a grating head. The grating ruler is mounted on the push rod, and the grating head is mounted on the sliding sleeve seat. The grating head and the grating ruler cooperate to detect the displacement of the push rod. When the piston rod of the high-pressure cylinder extends, the push rod drives the grating ruler to move relative to the grating head, so that the grating ruler and the grating head cooperate to measure the displacement of the push rod, thereby measuring the stroke of the piston rod of the high-pressure cylinder and improving functionality.

[0010] Preferably, it also includes a cylinder block seat, a cylinder, and a piston plate. The cylinder block seat is mounted on a platform, and the cylinder is mounted on the cylinder block seat. One end of the cylinder is mounted on a sliding sleeve seat, and the other end of the cylinder is provided with an air outlet. The push rod passes through the sliding sleeve seat and extends into the cylinder. The piston plate is mounted on the push rod and slides in a sealing contact with the inner wall of the cylinder. A wear-resistant sealing ring is provided between the piston plate and the cylinder. When the push rod is pushed by the piston rod, the piston plate pushes the air inside the cylinder, causing the air to be discharged through the air outlet. Because the air outlet is small, the piston plate provides damping to the push rod, so that the ball and the disc always maintain rolling contact, improving stability and reliability.

[0011] Preferably, it also includes a pressure sensor and a thrust block. The sliding sleeve is movably arranged on the platform, the cylinder is slidably mounted on the cylinder seat, the pressure sensor is mounted on the cylinder seat, and the detection end of the pressure sensor is mounted on the thrust block, which is mounted on the sliding sleeve. When the air outlet of the cylinder is closed, when the piston rod of the high-pressure cylinder pushes the push rod and piston plate to move, the piston plate compresses the air inside the cylinder. The pressure of the compressed air acts on the cylinder and the sliding sleeve. The pressure sensor detects the pressure value through the thrust block, thereby detecting the thrust of the high-pressure cylinder and improving functionality.

[0012] Preferably, the assembly also includes a slide rod, a blocking plate, a nut, and a spring. One end of the slide rod is mounted on the cylinder body via a bracket. The blocking plate is slidably connected to the slide rod. The nut is threaded onto the slide rod. Both ends of the spring are connected to the blocking plate and the nut, respectively. The spring force presses the blocking plate against the air outlet of the cylinder body. The spring force causes the blocking plate to block the air outlet of the cylinder body. Rotating the nut adjusts the distance between the nut and the cylinder body, thereby adjusting the elastic compression of the spring, which in turn adjusts the force with which the blocking plate blocks the air outlet of the cylinder body, and consequently adjusts the damping force on the piston plate and the push rod.

[0013] Preferably, the system also includes a slide rail, a slide table, a monitoring component, and a background plate. The slide rail is mounted on the platform and is parallel to the top rod. The slide table is movably mounted on the slide rail. The monitoring component is mounted on the slide table, and the background plate is mounted on the platform. The background plate and the monitoring component are arranged opposite each other on both sides of the piston rod of the high-pressure cylinder. An infrared lens is installed on the monitoring component to monitor the high-pressure cylinder through the infrared lens and the supporting system. When there is a leak in the high-pressure cylinder, the temperature at the leak point will decrease, thereby testing the sealing performance of the high-pressure cylinder. The slide table is moved along the slide rail to adjust the position of the monitoring component, or the slide table moves with the disc on the slide rail, so that the monitoring component can monitor the state of the piston rod end of the high-pressure cylinder. Parallel detection lines are set on the background plate, so that the parallel detection lines on the background plate serve as the background of the piston rod. By analyzing the relative position of the parallel detection lines and the piston rod on the monitoring image, the overall bending of the piston rod is detected, and the entire test process is recorded.

[0014] Preferably, the loading mechanism includes a thrust table, a bracket, a vertical screw, two clamping plates, and a double-threaded rod. The thrust table is mounted on a platform, the bracket is mounted on the thrust table in a liftable manner, the vertical screw is mounted on the thrust table in a vertical rotational manner, and the vertical screw is threadedly connected to the bracket via a threaded sleeve. The two clamping plates are slidably mounted on the bracket relative to each other, and the double-threaded rod is mounted on the bracket in a horizontal rotational manner. The positive and negative threads of the double-threaded rod are threadedly connected to the two brackets respectively. Driving the vertical screw to rotate drives the bracket to rise and fall along the thrust table under the action of the threads, placing the fixed end of the high-pressure cylinder on the bracket. The bottom of the fixed end of the high-pressure cylinder abuts against the thrust table, driving the double-threaded rod to rotate. The double-threaded rod drives the two clamping plates to move closer together, so that the two clamping plates clamp the two sides of the fixed end of the high-pressure cylinder, completing the loading of the high-pressure cylinder. This mechanism is applicable to different models of high-pressure cylinders and has good versatility.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: during the extension of the piston rod, the measuring mechanism on the disc and the push rod measures the real-time change in the relative spatial position, and analyzes the extension and retraction accuracy of the piston rod of the high-pressure cylinder based on the change, thereby completing the extension and retraction accuracy test of the piston rod of the high-pressure cylinder, which has good practicality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the front section structure of the present invention; Figure 2 This is an isometric schematic diagram of the present invention; Figure 3 This is a side view of the structure of the present invention; Figure 4 This is a top view of the structure of the present invention; Figure 5 This is a schematic diagram of the rear-view axonometric structure of the present invention; Figure 6It is a structural diagram of the disk, sliding sleeve, push rod, ball bearings, and measuring mechanism. Figure 7 It is an enlarged structural diagram of the sliding sleeve seat, push rod, ball, magnet, grating ruler, grating head, cylinder seat, cylinder, pressure sensor, slide rod, blocking plate and spring, etc. Figure 8 It is a structural diagram of the disc, mounting plate, threaded tube, clamping block, threaded clamping sleeve and connecting plate, etc. Figure 9 It is a structural diagram showing the exploded state of the disc, mounting plate, threaded pipe, clamping block, threaded clamping sleeve, and connecting plate. Figure 10 This is a structural diagram of the loading mechanism.

[0017] The attached diagram is labeled as follows: 1. Air supply unit; 2. Platform; 3. Loading mechanism; 4. Disc; 5. Sliding sleeve seat; 6. Push rod; 7. Ball bearing; 8. Magnet; 9. Cross frame; 10. Magnetic sensor one; 11. Magnetic sensor two; 12. Mounting plate; 13. Threaded pipe; 14. Clamping block; 15. Threaded clamping sleeve; 16. Connecting plate; 17. Grating ruler; 18. Grating head; 19. Cylinder seat; 20. Cylinder; 21. Piston plate; 22. Pressure sensor; 23. Thrust block; 24. Sliding rod; 25. Blocking plate; 26. Nut; 27. Spring; 28. Slide rail; 29. ​​Slide table; 30. Monitoring component; 31. Background plate; 32. Thrust table; 33. Bracket; 34. Vertical screw; 35. Clamping plate; 36. Double threaded rod. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0019] Example 1, such as Figures 1 to 7 and Figure 10As shown, a high-pressure pneumatic unit test bench includes an air supply unit 1 and a platform 2. The platform 2 is mounted on the air supply unit 1, and the air supply unit 1 is equipped with a high-pressure air system. It also includes a loading mechanism 3, a disc 4, a sliding sleeve 5, a push rod 6, ball bearings 7, and a measuring mechanism. The loading mechanism 3 is mounted on the air supply unit 1 and is used to load the fixed end of a cylinder. The disc 4 is concentrically mounted on the piston rod end of the cylinder. The sliding sleeve 5 is mounted on the platform 2. One end of the push rod 6 is slidably mounted on the sliding sleeve 5. The push rod 6 is concentrically arranged with the axis of the piston rod of the cylinder. Ball bearings 7 are mounted on the end of the push rod 6 facing the disc 4. A measuring mechanism is mounted on the push rod 6 and the disc 4. The measuring mechanism is used to detect the disc bearing. The change in the relative position between disk 4 and push rod 6 is used to detect the concentricity and tilt angle of the piston rod during the extension and retraction process of the cylinder. The measuring mechanism includes a magnet 8, multiple crossbeams 9, multiple magnetic sensors 10 and multiple magnetic sensors 11. The magnet 8 is concentrically mounted on the end of the push rod 6. The multiple crossbeams 9 are evenly mounted on the disk 4 and are arranged perpendicular to the disk 4. The multiple magnetic sensors 10 are respectively mounted on the inner ends of the multiple crossbeams 9, and the multiple magnetic sensors 11 are respectively mounted on the outer ends of the multiple crossbeams 9. When the ball 7 rolls and contacts the disk 4, the magnet 8 is located between the multiple magnetic sensors 10 and the multiple magnetic sensors 11. It also includes a... The assembly includes a mounting plate 12, a threaded tube 13, multiple clamping blocks 14, and a threaded clamping sleeve 15. The mounting plate 12 is mounted on the end face of the disc 4 facing the loading mechanism 3. The threaded tube 13 is mounted on the mounting plate 12. The outer wall of the threaded tube 13 is provided with external threads. The threaded tube 13 is concentric with the disc 4. Multiple sliding grooves are evenly provided on the side wall of the threaded tube 13. Multiple clamping blocks 14 are slidably mounted in the multiple sliding grooves of the threaded tube 13. The outer wall of the end of the multiple clamping blocks 14 facing the loading mechanism 3 is provided with a guide slope. The threaded clamping sleeve 15 is rotatably screwed to the external threads of the threaded tube 13 through internal threads. The inner wall of the end of the threaded clamping sleeve 15 facing the mounting plate 12 is provided with a guide wedge surface that matches the multiple clamping blocks 14. It also includes a connecting plate 16, which is concentrically mounted on the end face of the disc 4 facing the loading mechanism 3. The mounting plate 12 is detachably mounted on the connecting plate 16. The loading mechanism 3 includes a thrust table 32, a bracket 33, a vertical screw 34, two clamping plates 35, and a double threaded rod 36. The thrust table 32 is mounted on the platform 2. The bracket 33 is mounted on the thrust table 32 in a height-adjustable manner. The vertical screw 34 is mounted on the thrust table 32 in a vertical rotation. The vertical screw 34 is threadedly connected to the bracket 33 through a threaded sleeve. The two clamping plates 35 are slidably mounted on the bracket 33. The double threaded rod 36 is mounted on the bracket 33 in a horizontal rotation. The positive and negative threads of the double threaded rod 36 are threadedly connected to the two brackets 33, respectively.

[0020] During operation, the vertical screw 34 is driven to rotate, and under the action of the thread, the bracket 33 is driven to rise and fall along the thrust table 32, placing the fixed end of the high-pressure cylinder on the bracket 33. The bottom of the fixed end of the high-pressure cylinder abuts against the thrust table 32, driving the double threaded rod 36 to rotate. The double threaded rod 36 drives the two clamping plates 35 to move closer together, so that the two clamping plates 35 clamp both sides of the fixed end of the high-pressure cylinder, completing the loading of the high-pressure cylinder. After the fixed end of the high-pressure cylinder is installed on the loading mechanism 3, the threaded tube 13 is fitted onto the end of the piston rod of the high-pressure cylinder. The threaded clamping sleeve 15 is rotated, and the threaded clamping sleeve 15 moves towards the mounting plate 12 under the action of the thread, so that the guide wedge surface of the threaded clamping sleeve 15 presses against the guide slope of the multiple clamping blocks 14, thereby pushing the multiple clamping blocks 14 into the interior of the threaded tube 13, so that the multiple clamping blocks 14 concentrically clamp the end of the piston rod of the high-pressure cylinder. The high-pressure air system in the air supply unit 1 is connected to the high-pressure cylinder. The push rod 6 extends, causing the ball bearing 7 to roll into contact with the end face of the disc 4. Pressure damping is applied to the push rod 6, ensuring that the disc 4 and ball bearing 7 remain in rolling contact during the extension of the piston rod of the high-pressure cylinder. The high-pressure cylinder is inflated, causing the piston rod to extend and push the disc 4 and push rod 6 to move. During the extension of the piston rod, due to machining accuracy issues, the piston rod causes the disc 4 to shift on the vertical plane of the piston rod axis. Simultaneously, the end of the piston rod causes the disc 4 to tilt, meaning the relative spatial position of the disc 4 and push rod 6 changes. Measuring mechanisms on the disc 4 and push rod 6 measure the real-time change in the relative spatial position. Based on this change, the extension accuracy of the high-pressure cylinder's piston rod is analyzed, thus completing the extension accuracy test of the high-pressure cylinder's piston rod. The specific measurement method is as follows: Four magnetic sensors are installed: a crossbeam 9, magnetic sensor 10, and magnetic sensor 21. Magnetic sensor 10 is located on one side of magnet 8, and magnetic sensor 21 is located on the other side. Each of the magnetic sensors detects the magnetic field strength at its location. When the end of the high-pressure cylinder piston rod oscillates and tilts during extension, it causes the disk 4 to oscillate and tilt, thereby changing the spatial position between the magnetic sensors 10 and magnet 8, and between the magnetic sensors 21 and magnet 8. The detected magnetic field strength values ​​of the magnetic sensors 10 and 21 are recorded in real time. The values ​​of the magnetic sensors 10 and 21 in a set of data are analyzed separately. Based on the values ​​of each magnetic sensor 10 and 21... The relative position of the center of magnet 8 and disk 4 is detected by the numerical increase or decrease of the magnetic sensor 10. For example, if one of the two magnetic sensors 10 arranged opposite each other increases and the other decreases, the piston rod of the high-pressure cylinder will shift towards the magnetic sensor 10 with the decreasing value, thereby obtaining the concentricity data of the piston rod of the high-pressure cylinder at this extension. At the same time, the values ​​of magnetic sensor 10 and magnetic sensor 21 located on the same crossbeam 9 in a set of data are analyzed. The tilt state of the push rod 6 and disk 4 is detected based on the increase or decrease of the values ​​of magnetic sensor 10 and magnetic sensor 21. For example, if the value of magnetic sensor 10 increases and the value of magnetic sensor 21 decreases, the end of the piston rod of the high-pressure cylinder will tilt outward of the crossbeam 9, thereby obtaining the tilt angle data of the piston rod of the high-pressure cylinder at this extension. This achieves non-contact measurement.

[0021] Example 2, as Figures 6 to 9As shown, based on Embodiment 1, it also includes a grating ruler 17 and a grating head 18. The grating ruler 17 is mounted on the push rod 6, and the grating head 18 is mounted on the sliding sleeve seat 5. The grating head 18 cooperates with the grating ruler 17 to detect the displacement of the push rod 6. It also includes a cylinder seat 19, a cylinder 20, and a piston plate 21. The cylinder seat 19 is mounted on the platform 2, and the cylinder 20 is mounted on the cylinder seat 19. One end of the cylinder 20 is mounted on the sliding sleeve seat 5, and the other end of the cylinder 20 is provided with an air vent. The push rod 6 passes through the sliding sleeve seat 5 and extends into the cylinder 20. The piston plate 21 is mounted on the push rod 6 and slides in a sealing contact with the inner wall of the cylinder 20. A wear-resistant mating joint is provided between the piston plate 21 and the cylinder 20. The system includes a grinding seal ring; it also includes a pressure sensor 22 and a thrust block 23. The sliding sleeve seat 5 is movably arranged on the platform 2. The cylinder body 20 is slidably mounted on the cylinder body seat 19. The pressure sensor 22 is mounted on the cylinder body seat 19. The detection end of the pressure sensor 22 is mounted on the thrust block 23, and the thrust block 23 is mounted on the sliding sleeve seat 5. The system also includes a slide rod 24, a blocking plate 25, a nut 26, and a spring 27. One end of the slide rod 24 is mounted on the cylinder body 20 through a bracket. The blocking plate 25 is slidably connected to the slide rod 24. The nut 26 is threaded onto the slide rod 24. The two ends of the spring 27 are connected to the blocking plate 25 and the nut 26, respectively. The elastic force of the spring 27 presses the blocking plate 25 tightly against the air outlet of the cylinder body 20.

[0022] When the piston rod of the high-pressure cylinder extends, the push rod 6 drives the grating ruler 17 to move relative to the grating head 18, so that the grating ruler 17 and the grating head 18 cooperate to measure the displacement of the push rod 6, and then measure the stroke of the piston rod of the high-pressure cylinder. The elastic force of spring 27 causes the blocking plate 25 to block the air outlet of cylinder 20. Rotating nut 26 adjusts the distance between nut 26 and cylinder 20, thereby adjusting the elastic compression of spring 27, thereby adjusting the force of blocking plate 25 in blocking air outlet of cylinder 20, and further adjusting the damping force on piston plate 21 and push rod 6. When push rod 6 is pushed by piston rod, piston plate 21 pushes the air inside cylinder 20, causing the air to be discharged through air outlet. Since the air outlet is small, piston plate 21 provides damping to push rod 6, so that ball 7 and disc 4 always maintain rolling contact, improving stability and reliability. When the air outlet of the cylinder 20 is sealed, the piston rod of the high-pressure cylinder pushes the push rod 6 and the piston plate 21 to move. The piston plate 21 compresses the air inside the cylinder 20. The pressure of the compressed air acts on the cylinder 20 and the sliding sleeve seat 5. The pressure sensor 22 detects the pressure value through the thrust block 23, thereby detecting the thrust of the high-pressure cylinder.

[0023] Example 3, as Figure 2 , Figure 4 and Figure 5As shown, based on Embodiment 1, it also includes a slide rail 28, a slide table 29, a monitoring component 30, and a background plate 31. The slide rail 28 is installed on the platform 2 and is parallel to the top rod 6. The slide table 29 is movably installed on the slide rail 28. The monitoring component 30 is installed on the slide table 29. The background plate 31 is installed on the platform 2. The background plate 31 and the monitoring component 30 are arranged opposite each other on both sides of the piston rod of the high-pressure cylinder.

[0024] An infrared lens is installed on the monitoring component 30. The high-pressure cylinder is monitored through the infrared lens and the supporting system. When there is a leak in the high-pressure cylinder, the temperature at the leak point will decrease, thereby testing the sealing performance of the high-pressure cylinder. The slide table 29 is moved along the slide rail 28 to adjust the position of the monitoring component 30, or the slide table 29 moves with the disc 4 on the slide rail 28, so that the monitoring component 30 can monitor the state of the piston rod end of the high-pressure cylinder. Parallel detection lines are set on the background plate 31, so that the parallel detection lines on the background plate 31 serve as the background of the piston rod. By analyzing the relative position of the parallel detection lines and the piston rod on the monitoring image, the overall bending of the piston rod is detected, and the entire test process is recorded.

[0025] like Figures 1 to 10As shown, in the high-pressure pneumatic unit test bench of the present invention, during operation, the fixed end of the high-pressure cylinder is first installed on the loading mechanism 3, the disc 4 is installed on the piston rod end of the high-pressure cylinder, the high-pressure air system in the air supply unit 1 is connected to the high-pressure cylinder, the push rod 6 extends to make the ball 7 roll contact with the end face of the disc 4, the nut 26 is rotated to adjust the distance between the nut 26 and the cylinder body 20, thereby adjusting the damping force on the piston plate 21 and the push rod 6, so that the disc 4 and the ball 7 remain in rolling contact during the extension of the piston rod of the high-pressure cylinder, and then the high-pressure cylinder is filled with air to extend the piston rod of the high-pressure cylinder to push the disc 4 and the push rod 6 to move. During the extension of the piston rod, due to the machining accuracy problem of the piston rod, the piston rod causes the disc 4 to shift on the vertical plane of the piston rod axis, and at the same time the end of the piston rod causes the disc 4 to tilt, that is, the relative spatial position of the disc 4 and the push rod 6 changes. By changing the spatial positions between multiple magnetic sensors 10 and magnet 8, and multiple magnetic sensors 11 and magnet 8, the magnetic field strength values ​​detected by the multiple magnetic sensors 10 and 11 are recorded in real time. Later, the extension and retraction accuracy of the piston rod of the high-pressure cylinder is analyzed by analyzing the obtained magnetic field strength values. Then, the grating ruler 17 and grating head 18 work together to measure the stroke of the piston rod of the high-pressure cylinder. With the air outlet of the cylinder body 20 closed, when the piston rod of the high-pressure cylinder pushes the push rod 6 and piston plate 21 to move, the piston plate 21 compresses the air inside the cylinder body 20. The compressed air pressure acts on the cylinder body 20 and the sliding sleeve seat 5. The pressure sensor 22 detects the pressure value through the thrust block 23, thereby detecting the thrust of the high-pressure cylinder. Finally, the monitoring component 30 records the entire test process, thus completing the extension and retraction accuracy test of the piston rod of the high-pressure cylinder.

[0026] The main functions achieved by this invention are: 1. Based on the principle of "magnetic sensing distance", this non-contact method converts the swing and tilt of the mechanical deviation piston rod into changes in the spatial distribution of the magnetic field. Then, it accurately captures these changes through multiple magnetic sensor arrays, and can simultaneously and integratedly measure the multi-dimensional dynamic performance of the piston rod, such as concentricity, tilt, stroke, and thrust. 2. The pairing of "disk-support-magnetic sensor array" and "top rod-ball-magnet" means that the disk 4 serves as a mechanism for collecting and amplifying deviations. The ball transmits the complex spatial motion of the piston rod end, including radial offset and angular tilt, to the magnet 8 on the top rod without damage, thereby improving detection accuracy. 3. A measurement method is proposed to convert the physical quantity displacement into a calculable magnetic field signal change, and to analyze the piston rod's axial offset (concentricity) and end face tilt (sway angle) using the magnetic field signal change. 4. Adjustable damping force: It can simulate different load conditions and accurately reverse the output thrust of the pneumatic components by measuring the force on the push rod through the pressure sensor 22; 5. A multi-functional visual monitoring system is adopted to record the test process, test the sealing performance of the high-pressure cylinder, monitor the condition of the piston rod end of the high-pressure cylinder, and detect the overall bending of the piston rod.

[0027] The high-pressure pneumatic unit test bench of the present invention has common mechanical methods in terms of installation, connection or setting. It can be implemented as long as it can achieve its beneficial effect. The air supply unit 1, platform 2, loading mechanism 3, sliding sleeve seat 5, top rod 6, ball bearing 7, magnet 8, cross frame 9, magnetic sensor one 10, magnetic sensor two 11, threaded tube 13, clamping block 14, threaded clamping sleeve 15, connecting plate 16, grating ruler 17, grating head 18, cylinder seat 19, cylinder 20, piston plate 21, pressure sensor 22, sliding rod 24, blocking plate 25, nut 26, spring 27, slide rail 28, slide table 29, monitoring component 30, background plate 31, vertical screw 34, clamping plate 35, and double threaded rod 36 of the high-pressure pneumatic unit test bench of the present invention are commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative labor from those skilled in the art.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-pressure pneumatic unit test bench, comprising an air supply unit (1) and a platform (2), wherein the platform (2) is mounted on the air supply unit (1), and the air supply unit (1) is internally equipped with a high-pressure air system; characterized in that, It also includes a loading mechanism (3), a disc (4), a sliding sleeve seat (5), a push rod (6), a ball bearing (7), and a measuring mechanism. The loading mechanism (3) is installed on the air supply unit (1) and is used to load the fixed end of the cylinder. The disc (4) is concentrically installed on the piston rod end of the cylinder. The sliding sleeve seat (5) is installed on the platform (2). One end of the push rod (6) is slidably installed on the sliding sleeve seat (5). The push rod (6) is arranged concentrically with the axis of the piston rod of the cylinder. The ball bearing (7) is installed on the end of the push rod (6) facing the disc (4). A measuring mechanism is installed on the push rod (6) and the disc (4). The measuring mechanism is used to detect the change in the relative position between the disc (4) and the push rod (6). Based on the above change, the concentricity and tilt angle of the piston rod of the cylinder during the extension and retraction process are detected.

2. The high-pressure pneumatic unit test bench as described in claim 1, characterized in that, The measuring mechanism includes a magnet (8), multiple crossbars (9), multiple magnetic sensor one (10) and multiple magnetic sensor two (11). The magnet (8) is concentrically mounted on the end of the top rod (6). The multiple crossbars (9) are evenly mounted on the disc (4) around the circumference. The multiple crossbars (9) are arranged perpendicular to the disc (4). The multiple magnetic sensor one (10) is mounted on the inner end of the multiple crossbars (9) respectively. The multiple magnetic sensor two (11) is mounted on the outer end of the multiple crossbars (9) respectively. When the ball (7) rolls and contacts the disc (4), the magnet (8) is located between the multiple magnetic sensor one (10) and the multiple magnetic sensor two (11).

3. The high-pressure pneumatic unit test bench as described in claim 1, characterized in that, It also includes a mounting plate (12), a threaded tube (13), multiple clamping blocks (14) and a threaded clamping sleeve (15). The mounting plate (12) is mounted on the end face of the disc (4) facing the loading mechanism (3). The threaded tube (13) is mounted on the mounting plate (12). The outer wall of the threaded tube (13) is provided with an external thread. The threaded tube (13) is concentric with the disc (4). Multiple grooves are evenly provided on the side wall of the threaded tube (13). Multiple clamping blocks (14) are slidably mounted in the multiple grooves of the threaded tube (13). A guide slope is provided on the outer wall of the end of the multiple clamping blocks (14) facing the loading mechanism (3). The threaded clamping sleeve (15) is rotated and screwed to the external thread of the threaded tube (13) through an internal thread. A guide wedge surface matching the multiple clamping blocks (14) is provided on the inner wall of the end of the threaded clamping sleeve (15) facing the mounting plate (12).

4. The high-pressure pneumatic unit test bench as described in claim 3, characterized in that, It also includes a connecting plate (16), which is concentrically mounted on the end face of the disc (4) facing the loading mechanism (3), and the mounting plate (12) is detachably mounted on the connecting plate (16).

5. The high-pressure pneumatic unit test bench as described in claim 1, characterized in that, It also includes a grating ruler (17) and a grating head (18). The grating ruler (17) is mounted on the top rod (6), and the grating head (18) is mounted on the sliding sleeve seat (5). The grating head (18) and the grating ruler (17) work together to detect the displacement of the top rod (6).

6. The high-pressure pneumatic unit test bench as described in claim 1, characterized in that, It also includes a cylinder seat (19), a cylinder (20) and a piston plate (21). The cylinder seat (19) is mounted on the platform (2), the cylinder (20) is mounted on the cylinder seat (19), one end of the cylinder (20) is mounted on the sliding sleeve seat (5), and the other end of the cylinder (20) is provided with an air outlet. The push rod (6) passes through the sliding sleeve seat (5) and extends into the cylinder (20). The piston plate (21) is mounted on the push rod (6), and the piston plate (21) slides and seals against the inner wall of the cylinder (20). A wear-resistant sealing ring is provided between the piston plate (21) and the cylinder (20).

7. A high-pressure pneumatic unit test bench as described in claim 6, characterized in that, It also includes a pressure sensor (22) and a thrust block (23). The sliding sleeve seat (5) is movably arranged on the platform (2). The cylinder (20) is slidably installed on the cylinder seat (19). The pressure sensor (22) is installed on the cylinder seat (19). The thrust block (23) is installed on the detection end of the pressure sensor (22). The thrust block (23) is installed on the sliding sleeve seat (5).

8. A high-pressure pneumatic unit test bench as described in claim 6, characterized in that, It also includes a slide rod (24), a plug plate (25), a nut (26) and a spring (27). One end of the slide rod (24) is mounted on the cylinder body (20) through a bracket. The plug plate (25) is slidably connected to the slide rod (24). The nut (26) is threaded onto the slide rod (24). The two ends of the spring (27) are connected to the plug plate (25) and the nut (26) respectively. The elastic force of the spring (27) presses the plug plate (25) against the air outlet of the cylinder body (20).

9. A high-pressure pneumatic unit test bench as described in claim 1, characterized in that, It also includes a slide rail (28), a slide table (29), a monitoring component (30), and a background plate (31). The slide rail (28) is installed on the platform (2) and is parallel to the top rod (6). The slide table (29) is movably installed on the slide rail (28). The monitoring component (30) is installed on the slide table (29). The background plate (31) is installed on the platform (2). The background plate (31) and the monitoring component (30) are arranged opposite to each other on both sides of the piston rod of the high-pressure cylinder.

10. A high-pressure pneumatic unit test bench as described in claim 1, characterized in that, The loading mechanism (3) includes a thrust table (32), a bracket (33), a vertical screw (34), two clamping plates (35) and a double threaded rod (36). The thrust table (32) is installed on the platform (2). The bracket (33) is installed on the thrust table (32) in a liftable manner. The vertical screw (34) is installed on the thrust table (32) in a vertical rotation. The vertical screw (34) and the bracket (33) are connected by a threaded sleeve. The two clamping plates (35) are installed on the bracket (33) in a relative sliding manner. The double threaded rod (36) is installed on the bracket (33) in a horizontal rotation. The positive and negative threads of the double threaded rod (36) are respectively threaded to the two brackets (33).

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