Pressure test detection device of hydraulic oil cylinder

Abstract

The utility model relates to the technical field of hydraulic oil cylinder detection, in particular to a hydraulic oil cylinder pressure test detection device which comprises a working table, a fixing assembly, a clamping assembly and a movable plate arranged on the working table in a sliding mode through a guide assembly. The hydraulic oil cylinder can be loaded through the load assembly, pressure test detection can be conducted on the hydraulic oil cylinder under the load, the weight of the balance weight box and the weight of balance weight liquid in the balance weight box are constant in the detection process, the load is kept constant in the test process, detection is more stable and accurate, and meanwhile the load can be adjusted through the adjusting assembly. Strokes, jittering, leakage and the like of the hydraulic cylinders under different loads are measured, and the maximum loads of various hydraulic cylinders under the condition that jittering and leakage do not occur are obtained.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder testing technology, and in particular to a hydraulic cylinder pressure testing device. Background Technology

[0002] During the production or testing of hydraulic cylinders, pressure testing is required. During the pressure testing process, the hydraulic cylinder is prone to instability, which can lead to loosening and make it difficult to perform stable pressure testing. Secondly, the length of the piston extension needs to be measured during the pressure testing process.

[0003] A hydraulic cylinder pressure testing device with publication number CN219827348U includes a worktable and a cylinder fixedly connected to the top of a top plate. It can firmly fix the hydraulic cylinder in both the vertical and horizontal directions, and the cylinder will not shake during the testing process, which is beneficial to the pressure testing work.

[0004] In actual testing, a load needs to be applied to the hydraulic cylinder. However, the thrust load applied by the spring force in the device is related to the spring compression length and cannot be kept constant or adjusted during testing. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as the inability to maintain a constant thrust load during pressure testing and the inability to adjust it, and to propose a pressure testing device for a hydraulic cylinder.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design a pressure testing device for a hydraulic cylinder, including a worktable, a fixed component, a clamping component, and a movable plate that is slidably mounted on the worktable via a guide component. A load component is installed at the bottom of the worktable, and the load component is used to pull the movable plate to the left.

[0008] An adjustment component is installed at the bottom of the workbench, and the adjustment component is used to adjust the mass of the load component.

[0009] The load assembly includes a mounting slot on the top of the workbench, and a roller is rotatably mounted on the left end of the mounting slot. A counterweight box is slidably mounted on the outer wall of the workbench's support leg. A protrusion is integrally formed on the bottom of the movable plate, and the protrusion is slidably disposed in the mounting slot. A traction rope is fixedly connected to the left end face of the protrusion, and the left end of the traction rope passes around the roller and is fixedly connected to the counterweight box.

[0010] The counterweight box has several columns fixed inside, and floats are slidably connected to the outer walls of the columns. A sealing ring is fixedly installed on the outer wall of the float, and the outer wall of the sealing ring is slidably connected to the counterweight box. An exhaust hole is opened at the top of the counterweight box, and a liquid level scale is slidably installed on the inner wall of one side of the exhaust hole, and the lower end of the liquid level scale is fixedly connected to the float.

[0011] Furthermore, the adjustment assembly includes an oil tank fixed to the bottom of the workbench and connected to the load assembly via a pipe. A screw is rotatably mounted inside the oil tank. A piston plate is threadedly connected to the outer wall of the screw. A sealing ring is fixedly mounted on the outer wall of the piston plate. The outer wall of the sealing ring is slidably connected to the inner wall of the oil tank. The front end of the screw passes through the oil tank and is fixedly connected to a handwheel.

[0012] Furthermore, the fixing assembly includes a frame fixed to the top of the workbench, and a cylinder is fixedly installed on the top of the frame. The lower end of the cylinder passes through and extends to the bottom of the top plate of the frame. Fixing frames are fixedly provided on the top of the workbench and the lower end of the piston rod of the cylinder, respectively. A pair of limiting rods are fixedly provided on the top of the upper fixing frame, and the upper ends of the limiting rods pass through and slide to connect with the frame.

[0013] Furthermore, the guide assembly includes a pair of dovetail grooves formed on the worktable, and a telescopic rod is slidably installed in the dovetail grooves. A movable plate is fixedly connected to the top of the pair of telescopic rods, and a scale is formed on the top of the worktable on one side of the dovetail grooves.

[0014] Furthermore, the clamping assembly includes baffles and cylinder two fixedly installed on the top of the workbench and located on the left and right sides of the fixed assembly, respectively, and a push plate is fixedly connected to the right end of the piston rod of cylinder two, and the bottom of the push plate is slidably connected to the workbench.

[0015] The present invention proposes a hydraulic cylinder pressure testing device, which has the following advantages: it can not only load the hydraulic cylinder through the load component, enabling pressure testing of the hydraulic cylinder under load, but also maintains a constant weight of the counterweight box and its internal counterweight fluid during the testing process, thus keeping the load constant and making the testing more stable and accurate. At the same time, it can adjust the load size through the adjustment component, measure the stroke, vibration, leakage, etc. of the hydraulic cylinder under different load sizes, and obtain the maximum load of various hydraulic cylinders without vibration or leakage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0018] Figure 3This is a schematic diagram of the adjustment component structure of this utility model;

[0019] Figure 4 This is an enlarged view of area A of this utility model.

[0020] In the diagram: 1. Workbench; 2. Fixing assembly; 21. Frame; 22. Cylinder; 23. Fixing frame; 24. Limiting rod; 3. Clamping assembly; 31. Baffle; 32. Cylinder II; 33. Push plate; 4. Guide assembly; 41. Dovetail groove; 42. Telescopic rod; 43. Scale; 5. Moving plate; 6. Load assembly; 61. Mounting slot; 62. Roller; 63. Counterweight box; 64. Protrusion; 65. Traction rope; 66. Column; 67. Float; 7. Adjusting assembly; 71. Oil tank; 72. Screw; 73. Piston plate; 74. Handwheel; 8. Liquid level scale. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figure 1-4 As an embodiment of this utility model, a hydraulic cylinder pressure testing device is disclosed, including a workbench 1, a fixing component 2, a clamping component 3, and a movable plate 5 slidably disposed on the workbench 1 via a guide component 4. A load component 6 is installed at the bottom of the workbench 1, and the load component 6 is used to pull the movable plate 5 to the left.

[0023] After placing the hydraulic cylinder on the workbench 1 and making its piston rod abut against the moving plate 5, the hydraulic cylinder is fixed by the fixing component 2 and the clamping component 3. The load component 6 applies a constant tension to the moving plate 5 during the test, so that it generates a constant thrust load on the piston rod of the hydraulic cylinder. During the test, the piston rod of the hydraulic cylinder resists the constant thrust load and pushes the moving plate 5 to the right. The stroke, vibration, leakage, etc. of the hydraulic cylinder under load are measured.

[0024] The bottom of the workbench 1 is equipped with an adjustment component 7, which is used to adjust the mass of the load component 6. According to different hydraulic cylinder parameters and testing requirements, the mass of the load component 6 is changed by adjusting the adjustment component 7, thereby changing the pulling force of the load component 6 on the moving plate 5 and flexibly adjusting the thrust load on the piston rod of the hydraulic cylinder.

[0025] The load assembly 6 includes a mounting groove 61 formed on the top of the workbench 1, and a roller 62 is rotatably mounted on the left end of the mounting groove 61. A counterweight box 63 is slidably mounted on the outer wall of the support leg of the workbench 1. A protrusion 64 is integrally formed on the bottom of the moving plate 5, and the protrusion 64 is slidably disposed in the mounting groove 61. A traction rope 65 is fixedly connected to the left end face of the protrusion 64. The left end of the traction rope 65 passes around the roller 62 and is fixedly connected to the counterweight box 63.

[0026] The counterweight box 63 is internally fixed with several columns 66. A float plate 67 is slidably connected to the outer wall of the column 66. A sealing ring is fixedly installed on the outer wall of the float plate 67, and the outer wall of the sealing ring is slidably connected to the counterweight box 63. The top of the counterweight box 63 is opened with an exhaust hole, and a liquid level scale 8 is slidably arranged on the inner wall of one side of the exhaust hole. The lower end of the liquid level scale 8 is fixedly connected to the float plate 67.

[0027] The float 67, which can only float on the surface of the counterweight liquid and can only move up and down along several columns 66, will not rise or fall when the counterweight box 63 is raised or lowered because the volume of the counterweight liquid does not change, thus keeping the surface of the counterweight liquid flat and preventing the counterweight liquid from oscillating during the rise and fall. When the counterweight liquid is drawn out through the pipe and injected into the counterweight box 63, the increase or decrease of the counterweight liquid causes the liquid surface and the float 67 to rise or fall, expelling and drawing in air through the exhaust port.

[0028] Specifically, the adjustment component 7 includes an oil tank 71 fixed to the bottom of the workbench 1 and connected to the load component 6 through a pipe. A screw 72 is rotatably installed inside the oil tank 71. A piston plate 73 is threadedly connected to the outer wall of the screw 72. A sealing ring is fixedly installed on the outer wall of the piston plate 73. The outer wall of the sealing ring is slidably connected to the inner wall of the oil tank 71. The front end of the screw 72 passes through the oil tank 71 and is fixedly connected to a handwheel 74.

[0029] Rotating the screw 72 by the handwheel 74 causes the piston plate 73, which is not rotating and is attached to the oil tank 71, to move back and forth. This causes the counterweight liquid behind the piston plate 73 to be squeezed out or drawn into the counterweight box 63 through the pipe, thereby changing the overall weight of the counterweight box 63 and the counterweight liquid inside, thus adjusting the load. When the piston plate 73 moves back and forth, air can enter and exit through the air inlet at the front end of the oil tank 71.

[0030] Furthermore, the fixing component 2 includes a frame 21 fixed to the top of the workbench 1, and a cylinder 22 is fixedly installed on the top of the frame 21. The lower end of the cylinder 22 passes through and extends to the bottom of the top plate of the frame 21. Fixing frames 23 are fixedly provided on the top of the workbench 1 and the lower end of the piston rod of the cylinder 22, respectively. A pair of limiting rods 24 are fixedly provided on the top of the upper fixing frame 23, and the upper end of the limiting rods 24 passes through and slides through the frame 21.

[0031] Specifically, the guide assembly 4 includes a pair of dovetail grooves 41 opened on the workbench 1, and a telescopic rod 42 is slidably installed in the dovetail grooves 41. The top of the pair of telescopic rods 42 is fixedly connected to a moving plate 5, and a scale 43 located on one side of the dovetail grooves 41 is opened on the top of the workbench 1.

[0032] When the movable plate 5 moves left and right under the drive of the hydraulic cylinder piston rod, it drives the telescopic rod 42 to move left and right, guiding the movable plate 5 so that it can only move left and right. By observing which scale position the movable plate 5 moves to on scale 43, the moving distance of the movable plate 5 and the stroke of the hydraulic cylinder can be obtained.

[0033] Furthermore, the clamping assembly 3 includes a baffle 31 fixedly installed on the top of the workbench 1 and located on the left and right sides of the fixing assembly 2 respectively, and a second cylinder 32. The piston rod of the second cylinder 32 is fixedly connected to a push plate 33 at the right end, and the bottom of the push plate 33 is slidably connected to the workbench 1.

[0034] Working process: When in use, after the hydraulic cylinder is placed in the lower fixed frame 23, the piston rod of cylinder 2 32 drives the push plate 33 to push the hydraulic cylinder to the right until its right end and the right end of the piston rod respectively abut the baffle 31 and the moving plate 5. Thus, the baffle 31 and the push plate 33 clamp and fix the hydraulic cylinder in the left and right directions. The piston rod of cylinder 22 drives the upper fixed frame 23 to descend, which works with the lower fixed frame 23 to clamp the hydraulic cylinder and prevent it from moving up and down, forward and backward or flipping.

[0035] After connecting the testing oil circuit to the hydraulic cylinder, start the testing device to test the hydraulic cylinder. Extend the piston end of the hydraulic cylinder and push the moving plate 5 to the right, and observe whether there is hydraulic oil leakage, vibration, or other issues and stroke.

[0036] During the test, the weight of the counterweight box 63 and its internal counterweight liquid is converted into a leftward pulling force on the protrusion 64 by the traction rope 65. The pulling force drives the moving plate 5 to apply a thrust load to the hydraulic cylinder piston rod that extends and retracts during the test, and the left end of the moving plate 5 is always pressed against the hydraulic cylinder piston rod and moves left and right accordingly. During the test, as the hydraulic cylinder piston rod drives the protrusion 64 and the moving plate 5 to move left and right, the traction rope 65 drives the counterweight box 63 to rise and fall.

[0037] By adjusting component 7, counterweight fluid is injected into counterweight box 63. The weight is adjusted by adjusting the liquid level. When calculating the load, the liquid level scale is raised by float plate 67, and the height of float plate 67 is increased. The height h is multiplied by the area of ​​float plate 67 to obtain the volume v of counterweight fluid. The load can be calculated by the formula that the load is equal to the sum of the weight of counterweight box 63 and the weight of the liquid G=ρVg. The stroke, vibration, leakage and other conditions of hydraulic cylinder under different loads can be measured, and the maximum load of various hydraulic cylinders without vibration and leakage can be obtained.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A hydraulic cylinder pressure testing device, comprising a workbench (1), a fixing assembly (2), a clamping assembly (3), and a moving plate (5) slidingly arranged on the workbench (1) through a guide assembly (4), characterized in that: The bottom of the workbench (1) is provided with a load assembly (6), and the load assembly (6) is used for pulling the moving plate (5) to the left; The bottom of the workbench (1) is provided with an adjusting assembly (7), and the adjusting assembly (7) is used for adjusting the mass of the load assembly (6); The load assembly (6) comprises an installation groove (61) formed in the top of the workbench (1), a roller (62) is rotatably installed at the left end of the installation groove (61), a counterweight box (63) is slidably installed on the outer wall of the supporting leg of the workbench (1), a protrusion (64) is integrally formed on the bottom of the moving plate (5) and slidably arranged in the installation groove (61), a pulling rope (65) is fixedly connected to the left end face of the protrusion (64), and the left end of the pulling rope (65) is wound around the roller (62) and fixedly connected to the counterweight box (63); A plurality of vertical columns (66) are fixedly arranged in the counterweight box (63), a floating plate (67) is slidably connected to the outer wall of the vertical column (66), a sealing ring is fixedly installed on the outer wall of the floating plate (67) and slidably connected to the counterweight box (63), an exhaust hole is formed in the top of the counterweight box (63), and a liquid level scale (8) is slidably arranged on the inner wall of one side of the exhaust hole.

2. The hydraulic cylinder pressure testing device of claim 1, wherein: The adjusting assembly (7) comprises an oil tank (71) fixedly arranged at the bottom of the workbench (1) and communicated with the load assembly (6) through a pipeline, a screw rod (72) is rotatably installed in the oil tank (71), a piston plate (73) is threadedly connected to the outer wall of the screw rod (72), a sealing ring is fixedly installed on the outer wall of the piston plate (73) and slidably connected to the inner wall of the oil tank (71), and the front end of the screw rod (72) penetrates through the oil tank (71) and is fixedly connected with a hand wheel (74).

3. The hydraulic cylinder pressure testing device of claim 1, wherein: The fixing assembly (2) comprises a rack (21) fixedly arranged on the top of the workbench (1), and a pneumatic cylinder (22) is fixedly installed on the top of the rack (21), the lower end of the pneumatic cylinder (22) penetrates through and extends below the top plate of the rack (21), a fixing frame (23) is fixedly arranged on the top of the workbench (1) and the lower end of the piston rod of the pneumatic cylinder (22), respectively, a pair of limiting rods (24) are fixedly arranged on the top of the fixing frame (23), and the upper ends of the limiting rods (24) penetrate through and slidably connect the rack (21).

4. The hydraulic cylinder pressure testing device of claim 1, wherein: The guide assembly (4) comprises a pair of dovetail grooves (41) formed in the workbench (1), and a telescopic rod (42) is slidably installed in the dovetail groove (41), the top of the telescopic rod (42) is fixedly connected with the moving plate (5), and a scale (43) is formed in the workbench (1) on one side of the dovetail groove (41).

5. The hydraulic cylinder pressure testing device of claim 1, wherein: The clamping assembly (3) comprises a baffle (31) and a pneumatic cylinder (32) fixedly installed on the top of the workbench (1) and respectively arranged on the left and right sides of the fixing assembly (2), the right end of the piston rod of the pneumatic cylinder (32) is fixedly connected with a push plate (33), and the bottom of the push plate (33) is slidably connected with the workbench (1).

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