Tow hook fatigue testing machine

Abstract

The utility model discloses a trailer hook fatigue testing machine, and relates to the technical field of testing machines. The fatigue testing machine comprises a workbench, a lifting frame and a height-adjustable sliding seat, a tow hook is arranged on the sliding seat, a rotating plate is arranged on the workbench and located on one side of the tow hook, a first driving assembly for driving the rotating plate to rotate is arranged at the bottom of the workbench, a vertical plate is arranged on the rotating plate, and a rotating plate is rotationally arranged on one side of the vertical plate; a second driving assembly used for controlling the rotating plate to rotate is arranged on the other side of the vertical plate, an electric push rod is fixedly arranged on one side of the rotating plate, the power output end of the electric push rod is sequentially connected with a load sensor and a guide block, the guide block is slidably arranged on the rotating plate, and a clamping jaw matched with a trailer hook is arranged on the side, away from the load sensor, of the guide block; the tow hook can be subjected to multi-angle test through the rotating plate and angle adjustment of the rotating plate, the fatigue test result of the tow hook can be accurately obtained, and the problems that an existing tow hook is short in service life, low in reliability and low in bearing capacity are solved.

Description

Technical Field

[0001] This utility model relates to the field of testing machine technology, specifically a trailer hook fatigue testing machine. Background Technology

[0002] The trailer hitch fatigue testing machine is a test machine that simulates the performance and durability of a trailer hitch under extreme or fixed load conditions in actual situations where a car cannot start and needs to be towed.

[0003] While existing trailer hooks can perform tensile tests at 0, 5, and 30 degrees, these tests only involve horizontal tension and cannot perform fatigue tests on trailer hooks from multiple angles and directions. In real-world applications, trailer hooks are used at different angles and in different orientations. Therefore, the existing horizontal testing methods for trailer hooks are not accurate enough to accurately determine the fatigue strength of trailer hooks at different angles. This hinders researchers from developing stronger trailer hooks based on existing ones, increases development time and costs, and fails to quickly solve the problems of short lifespan and low load-bearing capacity of existing trailer hooks. Utility Model Content

[0004] The purpose of this invention is to provide a trailer hook fatigue testing machine, which has a multi-directional and multi-angle adjustable structure to test trailer hooks. It can accurately obtain the fatigue test results of trailer hooks, which makes it easier for researchers to develop trailer hooks with greater fatigue strength based on existing trailer hooks through experiments on materials, forging methods, etc., shortening development time, reducing development costs, and solving the problems of low lifespan, reliability and load-bearing capacity of existing trailer hooks.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a trailer hook fatigue testing machine, comprising a worktable, a lifting frame on the worktable, a slide block slidably mounted on the lifting frame, a trailer hook laterally mounted on one side of the slide block, a lifting assembly for driving the slide block to slide at the top of the lifting frame, a locking assembly for locking the slide block to slide fixedly mounted on the outer side of the lifting frame, a rotating plate rotatably mounted on the top of the worktable and on the side of the trailer hook, a first driving assembly for driving the rotating plate to rotate at the bottom of the worktable, a vertical plate vertically mounted on the rotating plate, a rotating plate rotatably mounted on one side of the vertical plate, a second driving assembly for controlling the rotation of the rotating plate on the other side of the vertical plate, an electric push rod fixedly mounted on one side of the rotating plate, a load sensor and a guide block sequentially connected to the power output end of the electric push rod, the guide block slidably mounted on the rotating plate, and a gripper cooperating with the trailer hook on the side of the guide block away from the load sensor.

[0006] Preferably, the top of the lifting frame is provided with a crossbeam, and a lifting assembly is fixedly provided on the crossbeam. The lifting assembly includes a threaded rod and a drive motor. The middle part of the threaded rod runs longitudinally through the crossbeam, and the bottom end is provided on a slide block. A worm gear that cooperates with the threaded rod is rotatably provided on the top of the crossbeam. The drive motor is fixedly provided on the top of the crossbeam and located on one side of the worm gear. The power output end of the drive motor is provided with a worm that cooperates with the worm gear.

[0007] Preferably, the locking assembly includes a slide rail, which is longitudinally formed on the side wall of the lifting frame. A slide rod is transversely arranged on the outer side of the slide block, passing through the slide rail and sliding within the slide rail. Locking blocks are symmetrically arranged on the side wall of the lifting frame and on the upper and lower sides of the slide rod. Each locking block is provided with a bolt for limiting the slide rod.

[0008] Preferably, the first drive assembly includes a first speed-regulating motor, which is fixedly mounted on the bottom of the worktable. A first rotating shaft is fixedly mounted on the power output end of the first speed-regulating motor. The first rotating shaft passes through the worktable and the rotating plate in sequence. A first fixed flange is fixedly mounted on the top end of the first rotating shaft. The first fixed flange is fixedly mounted on the rotating plate.

[0009] Preferably, the second drive assembly includes a second speed-regulating motor, which is fixedly mounted on the outer side of the upright plate. A second rotating shaft is fixedly mounted on the power output end of the second speed-regulating motor. The second rotating shaft passes through the upright plate and the rotating plate sequentially from the outside to the inside. A second fixed flange is fixedly mounted on the end of the second rotating shaft away from the second speed-regulating motor. The second fixed flange is fixedly mounted on the inner side of the rotating plate.

[0010] Preferably, an electric actuator is fixedly installed on the inner side of the rotating plate, and an electric actuator for driving the electric actuator is installed on one side of the electric actuator. A connecting plate is fixedly installed on the rotating plate and on one side of the electric actuator. A load sensor and a guide block slidably installed on the connecting plate are sequentially installed at the power output end of the electric actuator. A gripper seat is fixedly installed on the guide block, and a gripper that cooperates with the trailer hook is installed on the gripper seat.

[0011] Preferably, the slide has a groove extending laterally, a fixing block is embedded in the groove, a pressure plate for fixing the fixing block in the groove is fixedly disposed on the outside of the slide, and a trailer hook is disposed on the fixing block.

[0012] Preferably, a protective cover is fixedly installed on the top of the workbench and on the rear side of the lifting frame, a controller is embedded in the right wall of the protective cover, and a display is embedded in the front wall of the protective cover.

[0013] Preferably, a movable groove is provided on the worktable and on the side of the first speed-regulating motor, and a third through hole corresponding to the movable groove is provided on the rotating plate. A locking bolt for fixing the rotating plate to the worktable is installed between the movable groove and the third through hole.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this invention, a lifting frame is fixedly installed on a workbench, a slide block is slidably installed on the lifting frame, and a trailer hook is installed on the slide block. A rotating plate is horizontally rotatably installed on the workbench and on one side of the trailer hook. A vertical plate is vertically installed on the rotating plate, and a rotating plate is longitudinally rotatably installed on the vertical plate. An electric push rod is fixedly installed on the rotating plate. The power output end of the electric push rod is sequentially equipped with a load sensor, a guide block, and a gripper that cooperates with the trailer hook. By controlling the height of the rotating plate, the rotating plate, and the slide block, fatigue tests on the trailer hook can be performed from multiple directions and angles. The fatigue test results of the trailer hook can be accurately obtained, which facilitates researchers to develop trailer hooks with greater fatigue strength based on existing trailer hooks through experiments on materials, forging methods, etc., shortening development time, reducing development costs, and solving the problems of low lifespan, reliability, and load-bearing capacity of existing trailer hooks. Attached Figure Description

[0016] Figure 1 The three-dimensional structure of this utility model Figure 1 ;

[0017] Figure 2 The three-dimensional structure of this utility model Figure 2 ;

[0018] Figure 3 This utility model Figure 1 A schematic diagram of the first partial structure;

[0019] Figure 4 This utility model Figure 3 A schematic diagram of the localized explosion structure;

[0020] Figure 5 This utility model Figure 1 A schematic diagram of the second local structure;

[0021] Figure 6 This utility model Figure 5 Three-dimensional structure Figure 1 ;

[0022] Figure 7 This utility model Figure 5 Three-dimensional structure Figure 2 ;

[0023] Figure 8 This utility model Figure 5A schematic diagram of the local decomposition structure;

[0024] Figure 9 This utility model Figure 7 Schematic diagram of local decomposition structure Figure 1 ;

[0025] Figure 10 This utility model Figure 7 Schematic diagram of local decomposition structure Figure 2 .

[0026] In the picture:

[0027] 1-Workbench, 2-Lifting frame, 3-First slide rail, 4-Slide block, 5-First slider, 6-Groove, 7-Fixing block, 8-Pressure plate, 9-Internal threaded hole, 10-Trailer hook, 11-External thread, 12-Slide rail, 13-Slide rod, 14-Locking block, 15-Bolt, 16-Crossbeam, 17-Lifting assembly, 1701-Threaded rod, 1702-Worm gear, 1703-Drive motor, 1704-Worm, 18-Rotating plate, 19-First drive assembly, 1901-First through hole, 1902-Second through hole, 1903-First speed regulating motor, 1904-First rotating shaft, 1905-First fixed... 20-Fixed flange, 21-Modible groove, 22-Third through hole, 23-Locking bolt, 24-Upright plate, 25-Rotating plate, 26-Second drive assembly, 2501-Fourth through hole, 2502-Fifth through hole, 2503-Second speed regulating motor, 2504-Second rotating shaft, 2505-Second fixed flange, 26-Connecting plate, 27-Second slide rail, 28-Electric actuator, 29-Fixed bracket, 30-Electric actuator, 31-Load sensor, 32-Guide block, 33-Second slider, 34-Gripper seat, 35-Gripper, 36-Protective cover frame, 37-Protective cover, 38-Controller, 39-Display. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figure 1-10 As shown, the trailer hook fatigue testing machine includes a worktable 1, combined with... Figure 1 , Figure 2 and Figure 3As shown, a protective cover frame 36 is fixedly installed on the top of the workbench 1 near the rear side. A protective cover 37 is fixedly installed on the protective cover frame 36. A controller 38 is embedded in the right wall of the protective cover 37, and a display 39 is embedded in the front wall of the protective cover 37. Lifting frames 2 are symmetrically arranged on the top of the workbench 1 and on one side of the protective cover 37. A sliding block 4 is slidably arranged between the two lifting frames 2. Preferably, combined with Figure 3 or Figure 4 As shown, a first slide rail 3 is longitudinally fixedly installed on the inner wall of each of the two lifting frames 2. A first slider 5 that cooperates with the first slide rail 3 is symmetrically arranged on both sides of the slide block 4. A groove 6 is transversely opened in the middle of the slide block 4. A fixing block 7 is embedded in the groove 6. A pressure plate 8 for fixing the fixing block 7 in the groove 6 is fixedly installed on the outer side of the slide block 4. A trailer hook 10 is provided on the fixing block 7. Preferably, an internal thread hole 9 is transversely opened on the fixing block 7. An external thread 11 that cooperates with the internal thread hole 9 is provided on the trailer hook 10. A crossbeam 16 is transversely arranged on the top of the lifting frame 2. A lifting assembly 17 is fixedly installed on the crossbeam 16.

[0030] Furthermore, in combination Figure 4 As shown, the lifting assembly 17 includes a threaded rod 1701 and a drive motor 1703. The threaded rod 1701 extends longitudinally through the crossbeam 16 and its bottom end is fixedly mounted on the slide block 4. A worm gear 1702 is laterally rotatably mounted on the top of the crossbeam 16. It should be noted that the worm gear 1702 does not move vertically when rotating. The middle part of the worm gear 1702 engages with the threaded rod 1701. The drive motor 1703 is fixedly mounted on the top of the crossbeam 16 and located on one side of the worm gear 1702. The power output end of the drive motor 1703 is provided with a worm 1704 that engages with the worm gear 1702. When the drive motor 1703 rotates, it drives the worm 1704 to engage with the worm gear 1702. When the worm gear 1702 rotates, the threaded rod 1701 engaging with the worm gear 1702 moves vertically. A locking assembly for locking the slide block 4 is fixedly mounted on the outer side of the lifting frame 2. Figure 3 or Figure 4 As shown, the locking assembly includes a slide rail 12, which is longitudinally formed on the side wall of the lifting frame 2. A slide rod 13 is transversely arranged on the outer side of the slide block 4, which passes through the slide rail 12 and slides within the slide rail 12. Locking blocks 14 are symmetrically arranged on the side wall of the lifting frame 2 and on the upper and lower sides of the slide rod 13. Each locking block 14 is provided with a bolt 15 for limiting the slide rod 13.

[0031] Specifically in this embodiment, combined with Figure 1 , Figure 5 , Figure 6 and Figure 8As shown, a rotating plate 18 is rotatably mounted on the top of the workbench 1 and in front of the trailer hook 10. A first drive assembly 19 for driving the rotating plate 18 to rotate is provided at the bottom of the workbench 1. Furthermore, combined with Figure 8 As shown, the first drive assembly 19 includes a first through hole 1901, a second through hole 1902, and a first speed-regulating motor 1903. The first through hole 1901 is longitudinally disposed through the worktable 1, and the second through hole 1902 is longitudinally disposed through the rotating plate 18. The axis of the second through hole 1902 is collinear with the axis of the first through hole 1901. The first speed-regulating motor 1903 is fixedly disposed at the bottom of the worktable 1, and a first rotating shaft 1904 is fixedly disposed at the power output end of the first speed-regulating motor 1903. 04. The first through hole 1901 and the second through hole 1902 are passed through from bottom to top. The top end of the first rotating shaft 1904 is fixedly provided with a first fixed flange 1905. The first fixed flange 1905 is fixedly provided on the rotating plate 18. The workbench 1 is provided with a movable groove 20 on one side of the first speed regulating motor 1903. The rotating plate 18 is provided with a third through hole 21 corresponding to the movable groove 20. A locking bolt 22 for fixing the rotating plate 18 on the workbench 1 is embedded between the movable groove 20 and the third through hole 21.

[0032] Specifically in this embodiment, combined with Figure 5 , Figure 7 and Figure 8 As shown, a vertical plate 23 is vertically arranged on the rotating plate 18, a rotating plate 24 is rotatably arranged on one side of the vertical plate 23, and a second drive assembly 25 for controlling the rotation of the rotating plate 24 is arranged on the other side of the vertical plate 23. Furthermore, combined with... Figure 8 , Figure 9 and Figure 10 As shown, the second drive assembly 25 includes a fourth through hole 2501, a fifth through hole 2502, and a second speed-regulating motor 2503. The fourth through hole 2501 is horizontally opened on the upright plate 23, and the fifth through hole 2502 is horizontally opened on the rotating plate 24. The axis of the fifth through hole 2502 is collinear with the axis of the fourth through hole 2501. The second speed-regulating motor 2503 is fixedly installed on the outer side of the upright plate 23. A second rotating shaft 2504 is fixedly installed at the power output end of the second speed-regulating motor 2503. The second rotating shaft 2504 passes through the upright plate 23 and the rotating plate 24 from the outside to the inside. A second fixing flange 2505 is fixedly installed at the end of the second rotating shaft 2504 away from the second speed-regulating motor 2503. The second fixing flange 2505 is fixedly installed on the inner side of the rotating plate 24.

[0033] Furthermore, the control circuits of the drive motor 1703, the first speed-regulating motor 1903, and the second speed-regulating motor 2503 are respectively connected to the signal input terminal of the controller 38. The other side of the controller 38 is provided with a quick interface, which can be connected to an external computer through a quick connection cable. Preferably, it can realize the automatic switching of multiple test modes, improve test efficiency, and realize the automatic storage and export of data on the computer, which facilitates subsequent data analysis and processing.

[0034] Specifically in this embodiment, combined with Figure 7 or Figure 9 As shown, an electric actuator 28 is fixedly mounted on the side of the rotating plate 24 away from the upright plate 23. A fixing frame 29 is fixedly mounted on the right end of the rotating plate 24. An electric actuator 30 for driving the electric actuator 28 is mounted on the fixing frame 29 and located on one side of the electric actuator 28. Preferably, the electric actuator 30 is connected to the controller 38 through a control line. A load sensor 31 and a guide block 32 are sequentially mounted on the power output end of the electric actuator 28. The guide block 32 is slidably mounted on the rotating plate 24. Preferably, combined with... Figure 10 As shown, a connecting plate 26 is fixedly installed on the rotating plate 24 and on one side of the electric push rod 28. A second slide rail 27 is fixedly installed on the connecting plate 26. A second slider 33 that cooperates with the second slide rail 27 is provided at the bottom of the guide block 32. A gripper seat 34 is fixedly installed on the side of the guide block 32 away from the load sensor 31. A gripper 35 that cooperates with the trailer hook 10 is provided on the gripper seat 34. Preferably, the guide block 32 slides linearly on the connecting plate 26, which can effectively reduce interference factors in the test process and improve the test accuracy and reliability.

[0035] Furthermore, the guide block 32 is connected to the signal input terminal of the controller 38 via a control line. The signal processed by the controller 38 is connected to the display 39 via the control line from the signal input terminal of the controller 38. Preferably, the display 39 can accurately display the collected and processed test data.

[0036] Preferably, the rotation of the first speed-regulating motor 1903 drives the rotating plate 18 to rotate laterally on the worktable 1, and the rotation of the second speed-regulating motor 2503 drives the rotating plate 24 to rotate longitudinally on the vertical plate 23. The rotation of the first speed-regulating motor 1903 and the second speed-regulating motor 2503 adjusts the angle of the electric push rod 28, so as to realize multi-angle and multi-directional testing of the trailer hook 10. The fatigue test results of the trailer hook 10 can be accurately obtained. This makes it easier for researchers to conduct experiments on materials, forging methods and other aspects to develop a trailer hook 10 with greater fatigue strength based on the original trailer hook 10, shorten the development time, reduce the development cost, and solve the problems of low life, reliability and load-bearing capacity of the existing trailer hook.

[0037] Working principle:

[0038] In use, firstly, the external thread 11 on the trailer hook 10 engages with the internal thread hole 9 on the fixing block 7, and the fixing block 7 is pressed onto the slide block 4 by the pressure plate 8, thus fixing the trailer hook 10 onto the slide block 4. Secondly, the first speed-regulating motor 1903 drives the rotating plate 18 to rotate on the worktable 1 by controlling the angle, and then the second speed-regulating motor 2503 drives the rotating plate 24 to rotate on the vertical plate 23 by controlling the angle. After adjusting the angle to the ideal position, the clamp 35 fixes the end of the trailer hook 10 away from the slide block 4. Then, the electric push rod 28 is activated, and the reciprocating motion of the electric push rod 28 performs tensile and bending tests on the trailer hook 10. During the test, the force borne by the trailer hook 10 is transmitted to the input terminal of the controller 38 through the load sensor 31, and the signal transmitted from the output terminal of the controller 38 is transmitted. The signal is transmitted to the display 39, from which the force borne by the trailer hook 10 can be clearly observed. After the test, the gripper 35 is removed from the trailer hook 10. Then, the angles of the rotating plate 18 and the rotating plate 24 are adjusted by the first speed-regulating motor 1903 and the second speed-regulating motor 2503, respectively. After adjusting to the ideal position, the gripper 35 is fixed to the end of the trailer hook 10 away from the slide block 4. If the gripper 35 cannot cooperate with the trailer hook 10 due to the large adjustment range of the angles of the rotating plate 18 and the rotating plate 24, the worm 1704 at the power output end of the drive motor 1703 is controlled to cooperate with the worm wheel 1702. When the worm wheel 1702 rotates, the threaded rod 1701 moves up and down, realizing the function of adjusting the height of the slide block 4.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A trailer hook fatigue testing machine, comprising a workbench (1), characterized in that: A lifting frame (2) is provided on the workbench (1), and a slide block (4) is slidably provided on the lifting frame (2). A trailer hook (10) is horizontally provided on one side of the slide block (4). A lifting assembly (17) for driving the slide block (4) to slide is provided on the top of the lifting frame (2). A locking assembly for locking the slide block (4) to slide is fixedly provided on the outside of the lifting frame (2). A rotating plate (18) is rotatably provided on the top of the workbench (1) and on the side of the trailer hook (10). A first driving assembly (19) for driving the rotating plate (18) to rotate is provided at the bottom of the workbench (1). A vertical plate (23) is vertically arranged on the plate (18). A rotating plate (24) is rotatably arranged on one side of the vertical plate (23). A second drive assembly (25) for controlling the rotation of the rotating plate (24) is arranged on the other side of the vertical plate (23). An electric push rod (28) is fixedly arranged on one side of the rotating plate (24). A load sensor (31) and a guide block (32) are connected in sequence to the power output end of the electric push rod (28). The guide block (32) is slidably arranged on the rotating plate (24). A gripper (35) that cooperates with the trailer hook (10) is arranged on the side of the guide block (32) away from the load sensor (31).

2. The trailer hook fatigue testing machine according to claim 1, characterized in that: The top of the lifting frame (2) is provided with a crossbeam (16), and a lifting assembly (17) is fixedly provided on the crossbeam (16). The lifting assembly (17) includes a threaded rod (1701) and a drive motor (1703). The middle part of the threaded rod (1701) runs longitudinally through the crossbeam (16), and the bottom end is provided on the slide (4). The top of the crossbeam (16) is rotatably provided with a worm gear (1702) that cooperates with the threaded rod (1701). The drive motor (1703) is fixedly provided on the top of the crossbeam (16) and located on one side of the worm gear (1702). The power output end of the drive motor (1703) is provided with a worm (1704) that cooperates with the worm gear (1702).

3. The trailer hook fatigue testing machine according to claim 1, characterized in that: The locking assembly includes a slide rail (12), which is longitudinally opened on the side wall of the lifting frame (2). A slide rod (13) is transversely arranged on the outer side of the slide block (4), which passes through the slide rail (12) and slides within the slide rail (12). Locking blocks (14) are symmetrically arranged on the side wall of the lifting frame (2) and on the upper and lower sides of the slide rod (13). Each locking block (14) is provided with a bolt (15) for limiting the slide rod (13).

4. The trailer hook fatigue testing machine according to claim 1, characterized in that: The first drive assembly (19) includes a first speed-regulating motor (1903), which is fixedly installed at the bottom of the workbench (1). A first rotating shaft (1904) is fixedly installed at the power output end of the first speed-regulating motor (1903). The first rotating shaft (1904) passes through the workbench (1) and the rotating plate (18) in sequence. A first fixed flange (1905) is fixedly installed at the top of the first rotating shaft (1904). The first fixed flange (1905) is fixedly installed on the rotating plate (18).

5. The trailer hook fatigue testing machine according to claim 1, characterized in that: The second drive assembly (25) includes a second speed-regulating motor (2503), which is fixedly mounted on the outside of the upright plate (23). A second rotating shaft (2504) is fixedly mounted on the power output end of the second speed-regulating motor (2503). The second rotating shaft (2504) passes through the upright plate (23) and the rotating plate (24) from the outside to the inside. A second fixed flange (2505) is fixedly mounted on the end of the second rotating shaft (2504) away from the second speed-regulating motor (2503). The second fixed flange (2505) is fixedly mounted on the inside of the rotating plate (24).

6. The trailer hook fatigue testing machine according to claim 1, characterized in that: An electric actuator (28) is fixedly installed on the inner side of the rotating plate (24). An electric actuator (30) for driving the electric actuator (28) is installed on one side of the electric actuator (28). A connecting plate (26) is fixedly installed on the rotating plate (24) and on one side of the electric actuator (28). A load sensor (31) and a guide block (32) slidably installed on the connecting plate (26) are sequentially installed at the power output end of the electric actuator (28). A gripper seat (34) is fixedly installed on the guide block (32). A gripper (35) that cooperates with the trailer hook (10) is installed on the gripper seat (34).

7. The trailer hook fatigue testing machine according to claim 1, characterized in that: The slide (4) has a groove (6) opened laterally, and a fixing block (7) is embedded in the groove (6). A pressure plate (8) for fixing the fixing block (7) in the groove (6) is fixedly installed on the outside of the slide (4). A trailer hook (10) is provided on the fixing block (7).

8. The trailer hook fatigue testing machine according to claim 1, characterized in that: A protective cover (37) is fixedly installed on the top of the workbench (1) and on the rear side of the lifting frame (2). A controller (38) is embedded on the right wall of the protective cover (37), and a display (39) is embedded on the front wall of the protective cover (37).

9. The trailer hook fatigue testing machine according to claim 4, characterized in that: A movable slot (20) is provided on the workbench (1) and on one side of the first speed-regulating motor (1903). A third through hole (21) corresponding to the movable slot (20) is provided on the rotating plate (18). A locking bolt (22) for fixing the rotating plate (18) on the workbench (1) is installed between the movable slot (20) and the third through hole (21).

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