A microcomputer-controlled electric cylinder fatigue testing machine

Abstract

This utility model relates to the field of fatigue testing machine technology and discloses a microcomputer-controlled electric cylinder fatigue testing machine, including a test bench. A support plate is fixedly connected to the inner wall of the test bench, and a drive unit is provided at the bottom of the support plate. Four electric cylinders are snapped into the inside of the test bench. A sealing ring is fixedly connected to the inner wall of each electric cylinder, a dust cover is fixedly connected to the inner wall of each sealing ring, and a sealing gasket is fixedly connected to the inner wall of each dust cover. The device can easily drive the piston rod through a first AC servo motor, transmission gear, gear plate, and arc-shaped clamp in the drive unit. The PLC controller controls the first AC servo motor to operate, driving the drive shaft and transmission gear to rotate. The transmission gear meshes with the gear plate, thereby driving the gear plate to move up and down. The arc-shaped clamp on the gear plate is connected to the piston rod through positioning bolts, so that the piston rod reciprocates inside the electric cylinder, realizing the fatigue test of the electric cylinder and ensuring the accuracy and stability of the test.

Description

Technical Field

[0001] This utility model relates to the field of fatigue testing machine technology, and more specifically, to a microcomputer-controlled electric cylinder fatigue testing machine. Background Technology

[0002] A fatigue testing machine is a device used to determine the relevant performance data of materials or structures during the fatigue failure process under cyclic loading. By simulating alternating loads in actual working conditions, it can test and analyze the fatigue life and fatigue strength of materials or components. With the demand for high-precision and high-reliability products in modern industry, microcomputer-controlled electric cylinder fatigue testing machines are widely used in many fields because they can accurately control parameters such as loading force and displacement.

[0003] However, during long-term operation, the piston rod and seals of the existing microcomputer-controlled electric cylinder fatigue testing machine generate significant friction due to the frequent reciprocating motion. This not only accelerates the wear of the seals, leading to a decrease in sealing performance and hydraulic oil leakage, affecting the normal operation and loading accuracy of the testing machine, but also generates heat due to friction, causing the local temperature of the electric cylinder to rise, affecting the performance and lifespan of internal components, increasing equipment maintenance costs and downtime, and reducing production efficiency. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the above situation and to overcome the defects of the prior art, this utility model provides a microcomputer-controlled electric cylinder fatigue testing machine, which aims to solve the problems in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this application provides the following technical solution: a microcomputer-controlled electric cylinder fatigue testing machine, comprising a test bench, a support plate fixedly connected to the inner wall of the test bench, a drive unit provided at the bottom of the support plate, four electric cylinders snapped into the interior of the test bench, a sealing ring fixedly connected to the inner wall of each electric cylinder, a dust cover fixedly connected to the inner wall of each sealing ring, a sealing gasket fixedly connected to the inner wall of each dust cover, a piston rod slidably connected to the interior of each electric cylinder, the outer surface of each piston rod contacting the inner walls of two sealing gaskets, a lubrication unit provided on the outer side of the test bench, and a PLC controller fixedly connected to the left side of the test bench;

[0008] The lubrication unit includes a movable stage fixed to the back of the test bench. A lubrication box is fixedly connected to the back of the movable stage. A splicing plate is fixedly connected to the upper surface of the movable stage. An electric telescopic rod is fixedly connected to the right side of the splicing plate. A movable plate is fixedly connected to the telescopic end of the electric telescopic rod. A spiral groove is opened on the outer surface of each piston rod.

[0009] A second AC servo motor and a gear pump are fixedly connected to the upper surface of the moving plate. The output end of the second AC servo motor is fixedly connected to an inlet cylinder. A lubrication channel is fixedly connected to the inner wall of the inlet cylinder. The input end and output end of the gear pump are fixedly connected to an inlet pipe and an outlet pipe, respectively.

[0010] The present invention is further configured such that the drive unit includes four first AC servo motors fixedly connected to the test bench by fixing bolts; four ball bearings are fixedly connected to the inner wall of the test bench; a drive shaft is fixedly connected to the inner ring of each ball bearing; one end of each drive shaft is fixedly connected to the output end of the first AC servo motor; a transmission gear is fixedly connected to one end of each drive shaft; a toothed plate meshes with the outer surface of each transmission gear; two arc-shaped clamps are slidably connected to the upper surface of each toothed plate; the outer surface of each arc-shaped clamp is in contact with the outer surface of the bottom end of the piston rod; a positioning bolt is threadedly connected to the inner wall of each arc-shaped clamp and the inner wall of the piston rod; two positioning plates are snapped onto the outer surface of each electric cylinder; the inner wall of each positioning plate is threadedly connected to the inner wall of the support plate by fixing bolts; and the PLC controller is electrically connected to the four first AC servo motors by wires.

[0011] The present invention is further configured such that four bearing seats are fixedly connected to the inner bottom wall of the test bench, and the inner ring of each bearing seat is fixedly connected to the outer surface of the drive shaft.

[0012] The present invention is further configured such that four stabilizing platforms are fixedly connected to the inner bottom wall of the test bench, two stabilizing grooves are opened on the left side of each stabilizing platform, a balance plate is slidably connected inside each stabilizing groove, and the right side of each toothed plate is fixedly connected to the left side of the two balance plates.

[0013] The present invention is further configured such that the bottom of the movable plate is slidably connected to the upper surface of the movable platform via a slide rail, one end of the liquid outlet pipe passes through the liquid inlet cylinder and is fixedly connected to one end of the lubrication channel, one end of the liquid inlet pipe passes through the interior of the lubrication box, and the PLC controller is electrically connected to the electric telescopic rod, the second AC servo motor and the gear pump respectively via wires.

[0014] The present invention is further configured such that a fixing lock is slidably connected to the upper surface of the lubrication box, and the inner wall of the fixing lock is fixedly connected to the outer surface of the liquid inlet pipe.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This microcomputer-controlled electric cylinder fatigue testing machine utilizes a first AC servo motor, transmission gears, a gear plate, and an arc-shaped clamp in its drive unit to easily drive the piston rod. A PLC controller controls the first AC servo motor, which in turn drives the drive shaft and transmission gears to rotate. The transmission gears mesh with the gear plate, causing it to move up and down. The arc-shaped clamp on the gear plate is connected to the piston rod via positioning bolts, enabling the piston rod to reciprocate within the electric cylinder. This achieves fatigue testing of the electric cylinder, ensuring the accuracy and stability of the test. The lubrication tank, gear pump, electric telescopic rod, second AC servo motor, inlet cylinder, lubrication channels, and spiral grooves on the piston rod reduce friction and heat generation during the piston rod test. When the cylinder body needs to be installed, the PLC controller controls the second AC servo motor... The servo motor rotates the lubrication channel 90 degrees to one side, preventing it from obstructing cylinder installation and improving assembly efficiency. After installation, the electric telescopic rod moves the moving plate closer to the piston rod, activating the second AC servo motor and gear pump. The gear pump draws lubricant from the lubrication tank through the inlet pipe and delivers it to the lubrication channel of the inlet cylinder through the outlet pipe. The second AC servo motor drives the inlet cylinder to rotate, ensuring the lubricant is evenly coated on the piston rod surface along the spiral groove. This effectively reduces friction between the piston rod and the sealing gasket, preventing accelerated wear of the seals due to frequent friction, hydraulic oil leakage, and localized temperature increases in the electric cylinder caused by frictional heat. This extends the service life of internal components, reduces equipment maintenance costs, minimizes downtime, and improves production efficiency. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the back of the test bench of this utility model;

[0020] Figure 3 This is a three-dimensional structural diagram of the positioning plate of this utility model;

[0021] Figure 4 This is a detailed three-dimensional enlarged structural diagram of the spiral groove of this utility model;

[0022] Figure 5 This is a three-dimensional cross-sectional view of the liquid inlet cylinder of this utility model.

[0023] In the diagram: 1. Test bench; 2. PLC controller; 3. Moving stage; 4. Lubrication tank; 5. Splicing plate; 6. Liquid inlet cylinder; 7. Lubrication channel; 8. Fixing lock; 9. Liquid outlet pipe; 10. Piston rod; 11. Electric cylinder; 12. Stabilizing platform; 13. Positioning plate; 14. Support plate; 15. Electric telescopic rod; 16. First AC servo motor; 17. Sealing gasket; 18. Ball bearing; 19. Drive shaft; 20. Bearing housing; 21. Transmission gear; 22. Gear plate; 23. Arc-shaped clamp; 24. Positioning bolt; 25. Sealing ring; 26. Stabilizing groove; 27. Balance plate; 28. Second AC servo motor; 29. ​​Moving plate; 30. Gear pump; 31. Liquid inlet pipe; 32. Spiral groove; 33. Dust cover. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0027] Please see Figures 1-5 The test bench includes a test bench 1. A support plate 14 is fixedly connected to the inner wall of the test bench 1. A drive unit is set at the bottom of the support plate 14. Four electric cylinders 11 are snapped into the inside of the test bench 1. A sealing ring 25 is fixedly connected to the inner wall of each electric cylinder 11. A dust cover 33 is fixedly connected to the inner wall of each sealing ring 25. A sealing gasket 17 is fixedly connected to the inner wall of each dust cover 33. A piston rod 10 is slidably connected inside each electric cylinder 11. The outer surface of each piston rod 10 is in contact with the inner walls of two sealing gaskets 17. A lubrication unit is set on the outer side of the test bench 1. A PLC controller 2 is fixedly connected to the left side of the test bench 1.

[0028] Specifically, during the operation of the fatigue testing machine, the support plate 14 on the inner wall of the test bench 1 provides support for the drive unit. Four electric cylinders 11 are fixed inside the test bench 1. The sealing ring 25, dust cover 33, and sealing gasket 17 inside the electric cylinder 11 jointly ensure the sealing of the cylinder. The piston rod 10 slides inside the electric cylinder 11. When the PLC controller 2 issues a command, the drive unit starts to work and performs fatigue testing on the electric cylinder 11 by driving the piston rod 10 to move. This ensures that all components work closely together, effectively preventing external dust from entering the electric cylinder 11, ensuring the stability of the test environment, and improving the accuracy of the test.

[0029] Please see Figures 1-5 The drive unit includes four first AC servo motors 16 fixedly connected to the test bench 1 by fixing bolts. Four ball bearings 18 are fixedly connected to the inner wall of the test bench 1. Each ball bearing 18 has a drive shaft 19 fixedly connected to its inner ring. One end of each drive shaft 19 is fixedly connected to the output end of the first AC servo motor 16. One end of each drive shaft 19 is fixedly connected to a transmission gear 21. Each transmission gear 21 has a toothed plate 22 meshing on its outer surface. Two arc-shaped clamps 23 are slidably connected to the upper surface of each toothed plate 22. The outer surface of each arc-shaped clamp 23 is in contact with the outer surface of the bottom end of the piston rod 10. The inner wall of each arc-shaped clamp 23 is threadedly connected to the inner wall of the piston rod 10 with a positioning bolt 24. Two positioning plates 13 are snapped onto the outer surface of each electric cylinder 11. The inner wall of each positioning plate 13 is threadedly connected to the inner wall of the support plate 14 by fixing bolts. The PLC controller 2 is electrically connected to the four first AC servo motors 16 by wires.

[0030] Specifically, when the PLC controller 2 sends an electrical signal to the first AC servo motor 16, the first AC servo motor 16 starts, and its output drives the drive shaft 19 to rotate. The drive shaft 19 rotates stably in the ball bearing 18, and the transmission gear 21 on the drive shaft 19 rotates accordingly. The transmission gear 21 meshes with the gear plate 22, driving the gear plate 22 to move up and down. The arc-shaped clamping piece 23 on the gear plate 22 is fixed to the bottom end of the piston rod 10 by the positioning bolt 24, so that the piston rod 10 reciprocates in the electric cylinder 11. The positioning plate 13 fixes the electric cylinder 11 to the support plate 14, ensuring that the electric cylinder 11 is stable in position during the test, ensuring the stability and accuracy of the fatigue test of the electric cylinder 11, and avoiding the problem of inaccurate test results due to unstable drive.

[0031] Please see Figures 1-5The inner bottom wall of the test bench 1 is fixedly connected with four bearing seats 20. The inner ring of each bearing seat 20 is fixedly connected to the outer surface of the drive shaft 19. The inner bottom wall of the test bench 1 is fixedly connected with four stabilizing platforms 12. Each stabilizing platform 12 has two stabilizing grooves 26 on its left side. Each stabilizing groove 26 has a balance plate 27 slidably connected inside. The right side of each toothed plate 22 is fixedly connected to the left side of the two balance plates 27.

[0032] Specifically, the bearing seat 20 on the inner bottom wall of the test bench 1 further stabilizes the rotation of the drive shaft 19, ensuring the smoothness of the drive shaft 19 during operation. The balance plate 27 is slidably connected in the stabilizing groove 26 on the side of the stabilizing platform 12. The balance plate 27 is fixed to the right side of the toothed plate 22. When the toothed plate 22 moves up and down under the drive of the transmission gear 21, the balance plate 27 slides in the stabilizing groove 26, providing stable support and guidance for the toothed plate 22, preventing the toothed plate 22 from deviating during movement, ensuring the straightness of the piston rod 10 movement, and further improving the accuracy and stability of the test.

[0033] Please see Figures 1-5 The lubrication unit includes a movable stage 3 fixed to the back of the test bench 1. A lubrication box 4 is fixedly connected to the back of the movable stage 3. A splicing plate 5 is fixedly connected to the upper surface of the movable stage 3. An electric telescopic rod 15 is fixedly connected to the right side of the splicing plate 5. A movable plate 29 is fixedly connected to the telescopic end of the electric telescopic rod 15. The bottom of the movable plate 29 is slidably connected to the upper surface of the movable stage 3 via a slide rail. A spiral groove 32 is opened on the outer surface of each piston rod 10. A second AC servo motor is fixedly connected to the upper surface of the movable plate 29. The second AC servo motor 28 and gear pump 30 are connected to a liquid inlet cylinder 6 at the output end of the second AC servo motor 28. A lubrication channel 7 is fixedly connected to the inner wall of the liquid inlet cylinder 6. The input and output ends of the gear pump 30 are respectively fixedly connected to a liquid inlet pipe 31 and a liquid outlet pipe 9. One end of the liquid outlet pipe 9 passes through the liquid inlet cylinder 6 and is fixedly connected to one end of the lubrication channel 7. One end of the liquid inlet pipe 31 passes through the interior of the lubrication box 4. The PLC controller 2 is electrically connected to the electric telescopic rod 15, the second AC servo motor 28 and the gear pump 30 through wires.

[0034] Specifically, when lubrication of the piston rod 10 is required, the PLC controller 2 controls the electric telescopic rod 15 to extend, pushing the moving plate 29 to slide closer to the piston rod 10 on the moving platform 3. At the same time, the second AC servo motor 28 and the gear pump 30 are started. The gear pump 30 draws the lubricant from the lubrication tank 4 through the inlet pipe 31 and then delivers it to the lubrication channel 7 of the inlet cylinder 6 through the outlet pipe 9. The second AC servo motor 28 drives the inlet cylinder 6 to rotate, so that the lubricant is evenly coated on the surface of the piston rod 10 along the spiral groove 32 on the outer surface of the piston rod 10. This lubrication method effectively reduces the friction between the piston rod 10 and the sealing gasket 17, avoids the problem of accelerated wear of the seal due to frequent friction, hydraulic oil leakage, and local temperature rise of the electric cylinder 11 due to frictional heat, and extends the service life of internal components.

[0035] Please see Figures 1-5 The upper surface of the lubrication box 4 is slidably connected to a fixing lock 8, and the inner wall of the fixing lock 8 is fixedly connected to the outer surface of the liquid inlet pipe 31.

[0036] Specifically, the fixing lock 8 on the upper surface of the lubrication tank 4 is fixedly connected to the outer surface of the inlet pipe 31. When the gear pump 30 is working, the fixing lock 8 fixes and limits the inlet pipe 31, preventing the inlet pipe 31 from shaking or shifting during the delivery of lubricating fluid. This ensures the stability of the connection between the inlet pipe 31 and the lubrication tank 4, and ensures that the lubricating fluid can be continuously and stably delivered from the lubrication tank 4 to the gear pump 30, thereby ensuring the normal operation of the entire lubrication system.

[0037] Working principle:

[0038] When the microcomputer-controlled electric cylinder fatigue testing machine is working, the support plate 14 on the inner wall of the test bench 1 provides support for the drive unit. The four electric cylinders 11 are snapped into the inside of the test bench 1. The sealing ring 25, dust cover 33 and sealing gasket 17 inside the electric cylinder 11 together ensure the sealing of the cylinder. When the PLC controller 2 issues a command, the four first AC servo motors 16 start, and their output ends drive the drive shaft 19 to rotate in the ball bearing 18. The transmission gear 21 on the drive shaft 19 rotates accordingly and meshes with the gear plate 22, driving the gear plate 22 to move up and down. The arc-shaped clamping piece 23 on the gear plate 22 drives the piston rod 10 to reciprocate in the electric cylinder 11 through the positioning bolt 24. Position plate 13 fixes electric cylinder 11 to support plate 14, ensuring the stable position of electric cylinder 11 and enabling fatigue testing of electric cylinder 11. Bearing seat 20 on the inner bottom wall of test bench 1 stabilizes the rotation of drive shaft 19. Balance plate 27 in the stabilizing groove 26 on the side of stabilizing platform 12 is fixed to the right side of gear plate 22, providing stable support and guidance for gear plate 22, ensuring the straightness of piston rod 10 movement, and improving test accuracy and stability. When lubrication is required, PLC controller 2 controls electric telescopic rod 15 to push moving plate 29 closer to piston rod 10, and at the same time starts second AC servo motor 28 and gear pump 30. Gear pump 30 draws lubricating fluid from lubrication tank 4 through inlet pipe 31. The lubricant is delivered to the lubrication channel 7 of the inlet cylinder 6 through the outlet pipe 9. The second AC servo motor 28 drives the inlet cylinder 6 to rotate, so that the lubricant is evenly coated on the surface of the piston rod 10 along the spiral groove 32 on the outer surface of the piston rod 10, reducing the friction between the piston rod 10 and the sealing gasket 17, avoiding wear of the seal, hydraulic oil leakage, and local temperature rise of the electric cylinder 11, and extending the service life of the components. The fixing lock 8 on the upper surface of the lubrication box 4 is fixedly connected to the outer surface of the inlet pipe 31. When the gear pump 30 is working, the fixing lock 8 fixes and limits the inlet pipe 31, ensuring a stable connection between the inlet pipe 31 and the lubrication box 4, ensuring continuous and stable delivery of lubricant, and ensuring the normal operation of the lubrication system. During the experiment, the equipment operated with significantly lower noise than the hydraulic pump, and the control process was unaffected by temperature, resulting in more stable performance. Furthermore, it fundamentally solves the pollution and malfunction problems common in traditional hydraulic systems: it eliminates environmental pollution caused by hydraulic oil leaks and spills, and it does not stop working due to contamination of the servo valve. In terms of design, its power and transmission system is more compact and the structure is simple and clear, greatly improving overall reliability. It can maintain stable operation even after long-term use. It is worth mentioning that the equipment requires no maintenance, eliminating the tedious operation of changing hydraulic oil, and avoiding many drawbacks of hydraulic systems that require cooling due to excessively high oil circuit temperatures caused by prolonged operation.

[0039] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A microcomputer-controlled electric cylinder fatigue tester comprising a test bed (1), characterized in that: The inner wall of the test bench (1) is fixedly connected to a support plate (14), and a drive unit is provided at the bottom of the support plate (14). Four electric cylinders (11) are snapped into the inside of the test bench (1). A sealing ring (25) is fixedly connected to the inner wall of each electric cylinder (11). A dust cover (33) is fixedly connected to the inner wall of each sealing ring (25). A sealing gasket (17) is fixedly connected to the inner wall of each dust cover (33). A piston rod (10) is slidably connected to the inside of each electric cylinder (11). The outer surface of each piston rod (10) is in contact with the inner wall of two sealing gaskets (17). A lubrication unit is provided on the outer side of the test bench (1). A PLC controller (2) is fixedly connected to the left side of the test bench (1). The lubrication unit includes a movable stage (3) fixed to the back of the test bench (1), a lubrication box (4) fixedly connected to the back of the movable stage (3), a splicing plate (5) fixedly connected to the upper surface of the movable stage (3), an electric telescopic rod (15) fixedly connected to the right side of the splicing plate (5), a movable plate (29) fixedly connected to the telescopic end of the electric telescopic rod (15), and a spiral groove (32) is opened on the outer surface of each piston rod (10). The upper surface of the moving plate (29) is fixedly connected to a second AC servo motor (28) and a gear pump (30). The output end of the second AC servo motor (28) is fixedly connected to an inlet cylinder (6). The inner wall of the inlet cylinder (6) is fixedly connected to a lubrication channel (7). The input end and output end of the gear pump (30) are fixedly connected to an inlet pipe (31) and an outlet pipe (9).

2. The microcomputer-controlled electric cylinder fatigue testing machine according to claim 1, characterized by: The drive unit includes four first AC servo motors (16) fixedly connected to the test bench (1) by fixing bolts. Four ball bearings (18) are fixedly connected to the inner wall of the test bench (1). A drive shaft (19) is fixedly connected to the inner ring of each ball bearing (18). One end of each drive shaft (19) is fixedly connected to the output end of the first AC servo motor (16). A transmission gear (21) is fixedly connected to one end of each drive shaft (19). A toothed plate (22) meshes with the outer surface of each transmission gear (21). Each toothed plate (22)... The upper surface of each of the electric cylinders (11) is slidably connected to two arc-shaped clips (23). The outer surface of each arc-shaped clip (23) is in contact with the outer surface of the bottom end of the piston rod (10). The inner wall of each arc-shaped clip (23) is threadedly connected to the inner wall of the piston rod (10) with a positioning bolt (24). The outer surface of each electric cylinder (11) is clamped with two positioning plates (13). The inner wall of each positioning plate (13) is threadedly connected to the inner wall of the support plate (14) by a fixing bolt. The PLC controller (2) is electrically connected to four first AC servo motors (16) through wires.

3. The microcomputer-controlled electric cylinder fatigue testing machine according to claim 1, characterized in that: The inner bottom wall of the test bench (1) is fixedly connected with four bearing seats (20), and the inner ring of each bearing seat (20) is fixedly connected to the outer surface of the drive shaft (19).

4. The microcomputer-controlled electric cylinder fatigue testing machine according to claim 2, characterized by: The inner bottom wall of the test bench (1) is fixedly connected with four stabilizing platforms (12). Each stabilizing platform (12) has two stabilizing grooves (26) on its left side. Each stabilizing groove (26) has a slidably connected balance plate (27) inside. The right side of each toothed plate (22) is fixedly connected to the left side of the two balance plates (27).

5. The microcomputer-controlled electric cylinder fatigue testing machine according to claim 1, characterized by: The bottom of the moving plate (29) is slidably connected to the upper surface of the moving platform (3) via a slide rail. One end of the liquid outlet pipe (9) passes through the liquid inlet cylinder (6) and is fixedly connected to one end of the lubrication channel (7). One end of the liquid inlet pipe (31) passes through the interior of the lubrication box (4). The PLC controller (2) is electrically connected to the electric telescopic rod (15), the second AC servo motor (28), and the gear pump (30) via wires.

6. The microcomputer-controlled electric cylinder fatigue testing machine according to claim 1, characterized by: The upper surface of the lubrication box (4) is slidably connected to a fixing lock (8), and the inner wall of the fixing lock (8) is fixedly connected to the outer surface of the liquid inlet pipe (31).

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