Plunger rod pressure testing device

Abstract

The invention relates to the technical field of compression resistance testing, in particular to a plunger rod pressure testing device which comprises a testing table, four supporting columns are fixedly connected to the top of the testing table, a testing mechanism used for testing plunger rod pressure is arranged among the tops of the four supporting columns, and a protection mechanism used for shielding chippings is arranged among the outer walls of the supporting columns. A fixing plate is fixedly connected to the top of the testing table, an L-shaped frame is fixedly connected to the top of the fixing plate, bottom grooves are formed in the front side and the rear side of the outer wall of the transverse end of the L-shaped frame correspondingly, clamping mechanisms used for clamping plunger rods are arranged at the bottom grooves, and a material pushing plate is slidably connected to the inner side of the longitudinal end of the L-shaped frame. According to the plunger rod feeding device, multiple plunger rods can be automatically fed and clamped, and the detected plunger rods can be automatically discharged before feeding, so that automatic replacement of the plunger rods is completed, detection personnel do not need to frequently open a cabinet door for clamping and discharging, and the convenience performance of the device is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of pressure resistance testing, and in particular to a plunger rod pressure testing device. Background Art

[0002] The plunger rod is a common mechanical component, usually used to achieve reciprocating motion in hydraulic systems. It is mainly used in devices such as hydraulic pumps, presses, internal combustion engines and cylinders. The main function of the plunger rod is to achieve the suction and discharge of liquid through reciprocating motion in the pump cylinder, thereby transmitting power in the hydraulic system. The matching accuracy between the plunger rod and the pump cylinder directly affects the working efficiency and service life of the pump. Most plunger pumps work under high pressure and large flow conditions. The plunger rod is a key component, and its pressure resistance is directly related to the reliability and service life of the pump. Through pressure resistance testing, the strength and durability of the plunger rod material can be evaluated to ensure normal operation under high pressure environments.

[0003] A plunger rod pressure testing device with publication number CN218823673U in the prior art can block the debris that pops out during the pressure test by setting isolation baffles around the press to prevent injury to people. The debris blocked by the isolation baffles can fall into the receiving hopper and then fall into the receiving barrel below, which is convenient for collecting the debris and makes the factory area more hygienic.

[0004] Although the above-mentioned device can prevent the splash of pressure test debris, there are still some defects in the actual testing process. When testing the plunger rods, in order to ensure the accuracy of the test results, each batch of plunger rods needs to randomly select multiple samples for pressure testing. However, the test device lacks an automatic material changing function. Therefore, when testing the plunger rods, the inspection personnel need to frequently open the test door to disassemble and replace the plunger rods, which is not only time-consuming and labor-intensive, but also greatly reduces the testing efficiency of the device.

[0005] Therefore, a plunger rod pressure testing device is proposed to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings existing in the background technology and to propose a plunger rod pressure testing device.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a plunger rod pressure testing device, comprising a test bench, four support columns are fixedly connected to the top of the test bench, a test mechanism for testing the plunger rod pressure is arranged between the tops of the four support columns, a protective mechanism for shielding debris is arranged between the outer walls of the support columns, a fixed plate is fixedly connected to the top of the test bench, an L-shaped frame is fixedly connected to the top of the fixed plate, bottom grooves are provided on the front and rear sides of the outer wall of the transverse end of the L-shaped frame, a clamping mechanism for clamping the plunger rod is provided at the bottom groove, a push plate is slidably connected to the inner side of the longitudinal end of the L-shaped frame, a pair of push springs are fixedly connected between the rear side of the push plate and the inner side of the L-shaped frame, and a rectangular frame is slidably connected to the side wall of the transverse end of the L-shaped frame and the side away from the bottom groove; A lower groove is provided at the top of the fixed plate and below the lateral end of the L-shaped frame, a middle plate is fixedly connected to the middle position of the lower groove near one side of the rectangular frame, a loading electric telescopic cylinder is fixedly connected to the side wall of the fixed plate, a U-shaped plate is slidably connected to the inner side of the lower groove, push rods for pushing the rectangular frame to move are fixedly connected to both sides of the top of the U-shaped plate, an output end of the loading electric telescopic cylinder is fixedly connected to the side wall of the U-shaped plate through the lower groove, and a limiting mechanism for limiting the other side of the plunger rod during the loading process is provided in the lower groove.

[0008] In the above technical solution, further, a lower plate is fixedly connected to the outer wall of the L-shaped frame and located inside the rectangular frame, and a return spring is fixedly connected between the side wall of the lower plate and the inner side of the rectangular frame.

[0009] In the above technical solution, further, the clamping mechanism includes a clamping electric telescopic cylinder, a pair of the clamping electric telescopic cylinders are provided, and the clamping electric telescopic cylinders are fixedly connected to the top of the fixed plate, and the clamping electric telescopic cylinders are arranged on both sides of the bottom groove, the top of the fixed plate and both sides of the bottom groove are slidably connected with clamping plates, and the output ends of the clamping electric telescopic cylinders are fixedly connected to the side walls of the clamping plates.

[0010] In the above technical scheme, further, the limit mechanism includes a limit rod, and the limit rod is provided with a pair. A movable frame is slidably connected to the inner side of the lower groove and located below the middle plate, a movable block is slidably connected to the inner side of the movable frame, and a connecting tube is fixedly connected to the side wall of the movable block, and the limit rod is fixedly connected to both sides of the connecting tube. The ends of the U-shaped plate are fixedly connected to right-angle blocks with inclined surfaces for extruding the connecting tube, a telescopic groove is provided on the side wall of the lower groove, an L-shaped plate is slidably connected to the inner side of the telescopic groove and at a position corresponding to the middle plate, a limit block is fixedly connected to the top of the test bench and located on the inner side of the lower groove, a pair of transverse grooves are provided at both ends of the inner side of the lower groove, and vertical grooves are provided between the two ends of the transverse groove, a pair of positioning rods are provided on the inner side of the connecting tube, and a discharge mechanism for opening the L-shaped plate for discharge is provided in the telescopic groove.

[0011] In the above technical solution, further, an upper spring is fixedly connected between the inner side of the moving frame and the top of the moving block, the limit rod is arranged on both sides of the middle plate, a lower spring is fixedly connected between the limit block and the moving frame, a positioning spring is fixedly connected between the positioning rods, grooves are respectively provided at the upper and lower ends of the two vertical grooves, and the groove located at the bottom is arranged in the vertical groove close to one side of the U-shaped plate, and the grooves are inclined on the sides close to each other, and the positioning rod is arranged to be a smooth arc surface on the far end.

[0012] In the above technical solution, further, a push plate is fixedly connected to the inclined surface of the right-angle block and at a position corresponding to the transverse groove, and an empty groove is opened in the middle of the bottom end of the U-shaped plate.

[0013] In the above technical scheme, further, the discharge mechanism includes an L-shaped extrusion rod, which is fixedly connected to the bottom end of one of the limit rod side walls, the lower groove side wall is provided with a sliding groove at a position corresponding to the L-shaped extrusion rod and is connected with the telescopic groove, the L-shaped plate side wall is slidably connected with a push rod, a release spring is fixedly connected between the outer wall of the push rod and the L-shaped plate side wall, a push spring is fixedly connected between the inner side of the telescopic groove and the L-shaped plate side wall, a release groove is provided on the inner side of the telescopic groove and at one end away from the lower groove, a discharge port is provided at the top of the test bench and below the L-shaped plate, a collecting chamber is provided on the side wall of the test bench and is connected with the discharge port, and a collection box is slidably connected to the inner side of the collecting chamber.

[0014] In the above technical solution, further, the release groove is arranged at a position corresponding to the push rod, the release groove is inclined near the lower groove, and the push rod extends away from the release groove to a position where the L-shaped extrusion rod can push.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can automatically clamp multiple plunger rods and perform compression testing through the arrangement of the feeding electric telescopic cylinder, rectangular frame, limit mechanism and push plate and other structures, thereby greatly improving the convenience of the device.

[0016] 2. The present invention can automatically discharge the plunger rod that has been inspected before loading by setting the discharge mechanism, thereby completing the automatic replacement of the plunger rod. There is no need for the inspector to frequently open the cabinet door to clamp and discharge the material, which greatly improves the convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the front three-dimensional structure of the testing device of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the test bench of the present invention; Figure 3It is a schematic diagram of the full-cut front three-dimensional structure of the test bench of the present invention; Figure 4 The appended Figure 3 A schematic diagram of the partially enlarged structure at center A; Figure 5 The appended Figure 3 A schematic diagram of the partially enlarged structure at B in the middle; Figure 6 It is a schematic diagram of the front full-section three-dimensional structure of the fixing plate of the present invention; Figure 7 The appended Figure 6 A schematic diagram of the partially enlarged structure at C in the middle; Figure 8 It is a schematic diagram of the overall appearance structure of the U-shaped plate and the connection frame of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the connection tube and the positioning rod separated according to the present invention.

[0018] In the figure: 1. Test bench; 2. Support column; 3. Test mechanism; 4. Protection mechanism; 5. Fixed plate; 6. L-shaped frame; 7. Bottom groove; 8. Push plate; 9. Push spring; 10. Rectangular frame; 11. Lower groove; 12. Middle plate; 13. Loading electric telescopic cylinder; 14. U-shaped plate; 15. Push rod; 16. Lower plate; 17. Reset spring; 18. Clamping electric telescopic cylinder; 19. Clamping plate; 20. Limit rod; 21. Moving frame ; 22. Moving block; 23. Connecting tube; 24. Right-angle block; 25. Upper spring; 26. Telescopic slot; 27. L-shaped plate; 28. Limit block; 29. ​​Lower spring; 30. Horizontal slot; 31. Vertical slot; 32. Positioning rod; 33. Positioning spring; 34. Groove; 35. Push plate; 36. L-shaped squeezing rod; 37. Push rod; 38. Release spring; 39. Push spring; 40. Release slot; 41. Discharge port; 42. Collection box. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] like Figure 1-9A plunger rod pressure testing device shown in the figure comprises a test bench 1, four support columns 2 are fixedly connected to the top of the test bench 1, a test mechanism 3 for testing the plunger rod pressure is arranged between the tops of the four support columns 2, the test mechanism 3 is mainly composed of components such as an extrusion piece, a pressure sensor and a drive, which are mature technologies in the prior art and will not be described in detail here, a protective mechanism 4 for shielding debris is arranged between the outer walls of the support columns 2, the protective mechanism 4 is mainly composed of a protective cover and an openable box door, which can avoid the splashing of debris during the experiment and improve the protection performance of the device, a fixed plate 5 is fixedly connected to the top of the test bench 1, an L-shaped frame 6 is fixedly connected to the top of the fixed plate 5, bottom grooves 7 are provided on the front and rear sides of the outer wall of the lateral end of the L-shaped frame 6, a clamping mechanism for clamping the plunger rod is provided at the bottom groove 7, a push plate 8 is slidably connected to the inner side of the longitudinal end of the L-shaped frame 6, a pair of push springs 9 are fixedly connected between the rear side of the push plate 8 and the inner side of the L-shaped frame 6, and a rectangular frame 10 is slidably connected to the side wall of the lateral end of the L-shaped frame 6 and the side away from the bottom groove 7; A lower groove 11 is provided at the top of the fixed plate 5 and below the lateral end of the L-shaped frame 6. A middle plate 12 is fixedly connected to the lower groove 11 at the middle position near one side of the rectangular frame 10. A feeding electric telescopic cylinder 13 is fixedly connected to the side wall of the fixed plate 5. A U-shaped plate 14 is slidably connected to the inner side of the lower groove 11. Push rods 15 for pushing the rectangular frame 10 to move are fixedly connected to both sides of the top of the U-shaped plate 14. The output end of the feeding electric telescopic cylinder 13 passes through the lower groove 11 and is fixedly connected to the side wall of the U-shaped plate 14. A limiting mechanism for limiting the other side of the plunger rod during the feeding process is provided in the lower groove 11. A lower plate 16 is fixedly connected to the outer wall of the L-shaped frame 6 and located on the inner side of the rectangular frame 10. A reset spring 17 is fixedly connected between the side wall of the lower plate 16 and the inner side of the rectangular frame 10. The setting of the reset spring 17 facilitates the rapid sliding reset of the rectangular frame 10 when resetting. The limiting mechanism includes a limiting rod 20, and a pair of limiting rods 20 are provided. A moving frame 21 is slidably connected to the inner side of the lower groove 11 and located below the middle plate 12. A moving block 22 is slidably connected to the inner side of the moving frame 21. A connecting tube 23 is fixedly connected to the side wall of the moving block 22. The limiting rod 20 is fixedly connected to both sides of the connecting tube 23. The ends of the U-shaped plate 14 are fixedly connected to right-angle blocks 24 with inclined surfaces for squeezing the connecting tube 23. A telescopic groove 26 is opened on the side wall of the lower groove 11. The inner side of the telescopic groove 26 and the corresponding position with the middle plate 12 An L-shaped plate 27 is slidably connected, a limit block 28 is fixedly connected to the top of the test bench 1 and located inside the lower groove 11, a pair of transverse grooves 30 are provided at both ends of the inner side of the lower groove 11, and a vertical groove 31 is provided between the two ends of the transverse groove 30. By setting the transverse groove 30 and the vertical groove 31, the moving direction of the positioning rod 32, the limiting rod 20 and the connecting tube 23 can be restricted to ensure the normal operation of the device. A pair of positioning rods 32 are provided inside the connecting tube 23, and a discharging mechanism for opening the L-shaped plate 27 to discharge materials is provided in the telescopic groove 26; An upper spring 25 is fixedly connected between the inner side of the moving frame 21 and the top of the moving block 22. Through the setting of the upper spring 25, when the feeding electric telescopic cylinder 13 drives the right-angle block 24 to reset, the limit rod 20 and the connecting tube 23 are quickly pulled downward to slide. The limit rod 20 is arranged on both sides of the middle plate 12, and a lower spring 29 is fixedly connected between the limit block 28 and the moving frame 21. A positioning spring 33 is fixedly connected between the positioning rods 32. The upper and lower ends of the two vertical grooves 31 are respectively provided with grooves 34, and the groove 34 located at the bottom is arranged in the vertical groove 31 close to the side of the U-shaped plate 14, and the grooves 34 are inclined on the side close to each other. Through the setting of the groove 34, it is convenient to limit the sliding position of the positioning rod 32, and the groove 34 is inclined on the side close to each other, which is convenient for the positioning rod 32 to slide out. The end of the positioning rod 32 away from each other is set as a smooth arc surface, which further facilitates the positioning rod 32 to slide out of the groove 34. The clamping mechanism includes a clamping electric telescopic cylinder 18, a pair of the clamping electric telescopic cylinders 18 are provided, and the clamping electric telescopic cylinders 18 are fixedly connected to the top of the fixed plate 5, and the clamping electric telescopic cylinders 18 are arranged on both sides of the bottom groove 7, and the top of the fixed plate 5 and the two sides of the bottom groove 7 are slidably connected with a clamping plate 19, and the output ends of the clamping electric telescopic cylinders 18 are fixedly connected to the side walls of the clamping plate 19; When the plunger rod is pressure tested, first open the box door of the protection mechanism 4, then push the push plate 8 backward to slide inside the L-shaped frame 6, and gradually compress the push spring 9, then place the plunger rod to be tested in the vertical end of the L-shaped frame 6 in turn, then release the push plate 8, and squeeze the plunger rod at the front end to be located next to the rectangular frame 10 under the elastic force of the push spring 9, then control the feeding electric telescopic cylinder 13 to start and drive the U-shaped plate 14 to move, and at the same time drive the right-angle block 24 and the push rod 15 to move at the same time, first squeeze the connecting tube 23 upward through the inclined surface of the right-angle block 24 (at this time, the positioning rod 32 in the connecting tube 23 is located in one of the grooves 34, and because there is a step between the groove 34 and the transverse groove 30, it is restricted and cannot slide horizontally, so it will slide upward under the squeezing of the inclined surface of the right-angle block 24); At the same time, the positioning rod 32 will be driven to gradually slide out of the groove 34 and slide into the vertical groove 31, and the positioning spring 33 will be gradually compressed toward the middle, so that the limiting rod 20 will slide out of the lower groove 11 and move to both sides of the plunger rod, and at the same time, the moving block 22 will slide upward in the moving frame 21 and gradually compress the upper spring 25, and then through the continued movement of the U-shaped plate 14, the positioning rod 32 will move to the top of the vertical groove 31, and the push rod 15 will move to the inner wall of the rectangular frame 10, and the connecting tube 23 will be squeezed to the push plate 35, so that the rectangular frame 10, the connecting tube 23, the limiting rod 20 and the moving frame 21 will be pushed to slide under the thrust of the U-shaped plate 14, and the return spring 17 will be gradually compressed, and the lower spring 29 will be stretched at the same time. , and then drive the plunger rod at the front end of the L-shaped frame 6 to move on the middle plate 12, and at the same time drive the positioning rod 32 to slide on the inside of the transverse groove 30. In this process, the side wall of the rectangular frame 10 will limit the plunger rod in the L-shaped frame 6 to prevent it from being pushed forward under the thrust of the push spring 9, and then push the plunger rod to the bottom groove 7 on the other side of the L-shaped frame 6. At the same time, the positioning rod 32 moves out of the transverse groove 30 and moves to the front of another groove 34. Then, under the elastic force of the positioning spring 33, the positioning rod 32 is pushed into the groove 34, so that the feeding electric telescopic cylinder 13 can be controlled to stop running, and the clamping electric telescopic cylinder 18 can be controlled to start, pushing the two clamping plates 19 to move to the middle to clamp the two sides of the plunger rod; Then, the feeding electric telescopic cylinder 13 is controlled to start resetting, thereby driving the U-shaped plate 14, the right-angle block 24 and the push rod 15 to reset, and then gradually releasing the push on the rectangular frame 10, and then pulling the rectangular frame 10 to reset under the elastic force of the reset spring 17. At the same time, since the positioning rod 32 is inserted in the groove 34, it cannot slide horizontally, and the right-angle block 24 will gradually slide out from under the connecting tube 23, so the squeezing of the connecting tube 23 is gradually released, so that the moving block 22 is pushed downward to slide under the elastic force of the upper spring 25, and drives The positioning rod 32 slides out of the groove 34 and into the vertical groove 31, and then the positioning rod 32 slides into the bottom end of the vertical groove 31, thereby releasing the sliding restriction on the lateral position of the positioning rod 32, and the limiting rod 20 moves out from the side of the plunger rod, and then under the elastic force of the lower spring 29, the moving frame 21, the moving block 22, the limiting rod 20 and the positioning rod 32 are pulled to reset, thereby completing the reset of the device and releasing the squeezing of the plunger rod in the L-shaped frame 6, and then the plunger rod to be tested is pushed to the side of the rectangular frame 10 under the elastic force of the push plate 8 and the push spring 9.

[0022] In order to ensure the normal operation of the device, a push plate 35 is fixedly connected to the inclined surface of the right-angle block 24 and at a position corresponding to the transverse groove 30. The setting of the push plate 35 facilitates the right-angle block 24 to push the connecting tube 23 into place and then push the connecting tube 23 to slide. An empty groove is opened in the middle of the bottom end of the U-shaped plate 14. The setting of the empty groove can prevent the U-shaped plate 14 from being obstructed by the limit block 28, thereby affecting the normal operation of the device.

[0023] In order to be able to automatically discharge the plunger rod that has been tested before loading, the discharge mechanism includes an L-shaped extrusion rod 36, which is fixedly connected to the bottom end of one of the side walls of the limit rod 20, and a slide groove is provided on the side wall of the lower groove 11 and at a position corresponding to the L-shaped extrusion rod 36 and is connected to the telescopic groove 26. The slide groove is set to avoid hindering the normal sliding of the L-shaped extrusion rod 36. A push rod 37 is slidably connected to the side wall of the L-shaped plate 27, and a release spring 38 is fixedly connected between the outer wall of the push rod 37 and the side wall of the L-shaped plate 27. The release spring 38 is set to facilitate pushing the push rod 37 into the release position. In the removal groove 40, a push spring 39 is fixedly connected between the inner side of the telescopic groove 26 and the side wall of the L-shaped plate 27. By setting the push spring 39, it is convenient to push the L-shaped plate 27 to reset. A release groove 40 is provided on the inner side of the telescopic groove 26 and away from the end of the lower groove 11. A discharge port 41 is provided at the top of the test bench 1 and below the L-shaped plate 27. A collecting chamber is provided on the side wall of the test bench 1 and is connected to the discharge port 41. A collecting box 42 is slidably connected to the inner side of the collecting chamber. By setting the collecting box 42, it is convenient to collect the discharged plunger rods, so that subsequent test personnel can record the test conditions. The release groove 40 is arranged at a position corresponding to the push rod 37, and the release groove 40 is arranged obliquely near the lower groove 11, so that the push rod 37 can quickly slide out of the release groove 40 under the elastic force of the push spring 39, and the push rod 37 extends away from the release groove 40 to a position where the L-shaped squeeze rod 36 can push. During the automatic feeding of the plunger rod, the connecting tube 23 and the limit rod 20 are driven to slide in the lower groove 11 by the feeding electric telescopic cylinder 13, which will drive the L-shaped extrusion rod 36 to move and slide into the slide groove, so that the end of the L-shaped extrusion rod 36 will push the push rod 37 and the L-shaped plate 27 to slide in the telescopic groove 26, and gradually compress the push spring 39, thereby releasing the restriction on the bottom of the plunger rod. At this time, the clamping mechanism can be controlled to release the clamping of the plunger rod, and then the plunger rod falls from the discharge port 41 under its own gravity and falls into the collection box 42 for collection and processing. Then the L-shaped extrusion rod 36 will push the push rod 37 to the release The release spring 38 is stretched outwards and the L-shaped plate 27 is pushed back to the original position to push the push rod 37 out of the release groove 40. The release spring 38 is stretched outwards and the L-shaped plate 27 is pushed back to the original position to push the push rod 37 out of the release groove 40. The release spring 38 is stretched outwards and the L-shaped plate 27 is pushed back to the original position to push the push rod 37 out of the release groove 40.

[0024] The basic principles, main features and advantages of the present invention are shown and described above.

[0025] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and the specification only describe the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A plunger rod pressure testing device, comprising a test bench (1), wherein four support columns (2) are fixedly connected to the top of the test bench (1), a test mechanism (3) for testing the plunger rod pressure is provided between the tops of the four support columns (2), and a protective mechanism (4) for shielding debris is provided between the outer walls of the support columns (2), characterized in that: The top of the test bench (1) is fixedly connected to a fixed plate (5), the top of the fixed plate (5) is fixedly connected to an L-shaped frame (6), the front and rear sides of the outer wall of the transverse end of the L-shaped frame (6) are provided with bottom grooves (7), the bottom groove (7) is provided with a clamping mechanism for clamping the plunger rod, the inner side of the longitudinal end of the L-shaped frame (6) is slidably connected to a push plate (8), a pair of push springs (9) are fixedly connected between the rear side of the push plate (8) and the inner side of the L-shaped frame (6), and a rectangular frame (10) is slidably connected to the side wall of the transverse end of the L-shaped frame (6) and away from the bottom groove (7); A lower groove (11) is provided at the top of the fixed plate (5) and below the lateral end of the L-shaped frame (6); a middle plate (12) is fixedly connected to the lower groove (11) at a middle position close to one side of the rectangular frame (10); a loading electric telescopic cylinder (13) is fixedly connected to the side wall of the fixed plate (5); a U-shaped plate (14) is slidably connected to the inner side of the lower groove (11); push rods (15) for pushing the rectangular frame (10) to move are fixedly connected to both sides of the top of the U-shaped plate (14); an output end of the loading electric telescopic cylinder (13) passes through the lower groove (11) and is fixedly connected to the side wall of the U-shaped plate (14); a limiting mechanism for limiting the other side of the plunger rod during the loading process is provided in the lower groove (11).

2. A plunger rod pressure testing device according to claim 1, characterized in that: A lower plate (16) is fixedly connected to the outer wall of the L-shaped frame (6) and located inside the rectangular frame (10), and a return spring (17) is fixedly connected between the side wall of the lower plate (16) and the inside of the rectangular frame (10).

3. A plunger rod pressure testing device according to claim 1, characterized in that: The clamping mechanism comprises a clamping electric telescopic cylinder (18), a pair of the clamping electric telescopic cylinders (18) are provided, and the clamping electric telescopic cylinders (18) are both fixedly connected to the top of the fixed plate (5), and the clamping electric telescopic cylinders (18) are arranged on both sides of the bottom groove (7), and the top of the fixed plate (5) and both sides of the bottom groove (7) are slidably connected to clamping plates (19), and the output ends of the clamping electric telescopic cylinders (18) are both fixedly connected to the side walls of the clamping plates (19).

4. A plunger rod pressure testing device according to claim 1, characterized in that: The limiting mechanism comprises a limiting rod (20), a pair of limiting rods (20) are provided, a moving frame (21) is slidably connected to the inner side of the lower groove (11) and located below the middle plate (12), a moving block (22) is slidably connected to the inner side of the moving frame (21), a connecting tube (23) is fixedly connected to the side wall of the moving block (22), the limiting rod (20) is fixedly connected to both sides of the connecting tube (23), the ends of the U-shaped plate (14) are fixedly connected to right-angle blocks (24) having inclined surfaces for squeezing the connecting tube (23), the lower groove (11 ) side wall is provided with a telescopic groove (26), an L-shaped plate (27) is slidably connected to the inner side of the telescopic groove (26) and at a position corresponding to the middle plate (12), a limiting block (28) is fixedly connected to the top of the test bench (1) and located on the inner side of the lower groove (11), a pair of transverse grooves (30) are provided at both ends of the inner side of the lower groove (11), a vertical groove (31) is provided between the two ends of the transverse groove (30), a pair of positioning rods (32) are provided on the inner side of the connecting tube (23), and a discharge mechanism for opening the L-shaped plate (27) to discharge materials is provided in the telescopic groove (26).

5. A plunger rod pressure testing device according to claim 4, characterized in that: An upper spring (25) is fixedly connected between the inner side of the moving frame (21) and the top of the moving block (22); the limiting rod (20) is arranged on both sides of the middle plate (12); a lower spring (29) is fixedly connected between the limiting block (28) and the moving frame (21); a positioning spring (33) is fixedly connected between the positioning rods (32); grooves (34) are respectively provided at the upper and lower ends of the two vertical grooves (31); the groove (34) located at the bottom is arranged in the vertical groove (31) close to the side of the U-shaped plate (14); the grooves (34) are arranged at an angle on the closer side; and the farther end of the positioning rod (32) is arranged as a smooth arc surface.

6. A plunger rod pressure testing device according to claim 4, characterized in that: A push plate (35) is fixedly connected to the inclined surface of the right-angle block (24) at a position corresponding to the transverse groove (30), and an empty groove is opened in the middle of the bottom end of the U-shaped plate (14).

7. A plunger rod pressure testing device according to claim 4, characterized in that: The discharge mechanism comprises an L-shaped extrusion rod (36), the L-shaped extrusion rod (36) being fixedly connected to the bottom end of the side wall of one of the limit rods (20); a slide groove is provided on the side wall of the lower groove (11) at a position corresponding to the L-shaped extrusion rod (36) and is communicated with the telescopic groove (26); a push rod (37) is slidably connected through the side wall of the L-shaped plate (27); a release spring (38) is fixedly connected between the outer wall of the push rod (37) and the side wall of the L-shaped plate (27); a push spring (39) is fixedly connected between the inner side of the telescopic groove (26) and the side wall of the L-shaped plate (27); a release groove (40) is provided on the inner side of the telescopic groove (26) and at one end away from the lower groove (11); a discharge port (41) is provided at the top of the test bench (1) and below the L-shaped plate (27); a collection chamber is provided on the side wall of the test bench (1) and is communicated with the discharge port (41); a collection box (42) is slidably connected to the inner side of the collection chamber.

8. A plunger rod pressure testing device according to claim 7, characterized in that: The release groove (40) is arranged at a position corresponding to the push rod (37), the release groove (40) is arranged obliquely on a side close to the lower groove (11), and the push rod (37) extends away from a side of the release groove (40) to a position that can be pushed by the L-shaped squeezing rod (36).

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