Spring fatigue detection equipment with protection structure

Abstract

The invention relates to the field of spring detection, and discloses a spring fatigue detection device with a protection structure, which comprises a bottom plate, a motor box is mounted in the middle of the upper surface of the bottom plate, a base is mounted on the outer side of the motor box on the upper surface of the bottom plate, and a collection structure is arranged on the base. A vertical rod is fastened to the middle of the top end of the motor box through bolts, a plurality of first connecting plates are connected to the position, close to the top end, of the side face of the vertical rod, and when a rotating plate drives a to-be-detected spring to rotate a detection position in a fixing cover for detection, a closed protection structure can be formed by a baffle and the fixing cover; when the moving-out turnover structure moves, the protection function can be started, when the moving-out turnover structure moves, firstly, the detected spring can be pushed out of the fixing cover to facilitate taking, then the broken spring can be automatically poured out into the collecting structure to be automatically collected through automatic turnover of a moving plate on the moving-out turnover structure, and operation is more labor-saving and convenient.

Description

[0001] This application is a divisional application with application number 2024111242811, application date August 16, 2024, and invention name “A device for spring fatigue detection”. Technical Field

[0002] The present invention relates to the technical field of spring detection, and in particular to a spring fatigue detection device with a protective structure. Background Art

[0003] A spring is a mechanical part that works by utilizing elasticity. Parts made of elastic materials deform under external forces and return to their original shape after the external force is removed. They are also called "springs" and are generally made of spring steel. There are many types of springs. According to their shapes, they mainly include coil springs, scroll springs, leaf springs, and special-shaped springs. After production, springs need to be tested for fatigue using fatigue testing equipment. In the fatigue testing equipment in the prior art, the electric telescopic rod in the adjustment mechanism drives the vertical plate to move, the vertical plate slides in the slide rod, the vertical plate drives the cylinder to move, the cylinder drives the vertical column to slide in the testing equipment body, and the vertical column drives the lower horizontal plate to rise to adjust the height of the lower horizontal plate. When fatigue testing is performed on spring bodies of different heights, no staff is required to operate. The electric telescopic rod drives the corresponding mechanical structure to perform adjustment, thereby improving the degree of automation of the testing equipment. However, during the inspection process, there are cases where the spring suddenly breaks. Although the inspection equipment is provided with a protective structure to shield the broken spring to reduce safety risks, the elastic waste produced by the break still remains on the inspection table of the equipment, and the broken spring needs to be cleaned and collected manually. This increases the workload of the workers when inspecting a large number of springs, is time-consuming and labor-intensive, and reduces work efficiency. Therefore, there is room for improvement. Summary of the Invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a spring fatigue detection device with a protective structure.

[0005] The present invention provides a spring fatigue detection device with a protective structure, which adopts the following technical solutions: A spring fatigue detection device with a protective structure comprises a bottom plate, a motor box is installed in the middle of the top of the bottom plate, a base is installed on the outside of the motor box on the top of the bottom plate, a collecting structure is provided on the base, a vertical rod is fastened with bolts at the middle of the top end of the motor box, a plurality of first connecting plates are connected to the side of the vertical rod near the top end, the plurality of first connecting plates are distributed at equal angles on the circumference of the vertical rod, the ends of the plurality of first connecting plates away from the vertical rod are connected to the inner wall of the fixed cover, the fixed cover is in the shape of a hollow ring, a rotating plate is movably provided on the lower inner wall of the fixed cover, the rotating plate is in the shape of a ring, a driving structure is provided between the motor box and the rotating plate, and a detection structure is provided at the top end of the vertical rod; A plurality of openings with equal angular distribution around the circumference are provided on a side of the fixed cover away from the vertical rod, a plurality of transparent windows are installed on a side of the fixed cover away from the vertical rod, the transparent windows and the openings are spaced apart from each other, a removable and flipping structure is provided on the upper surface of the rotating plate near the opening, and a supporting structure is provided between the lower surface of the rotating plate and the base; The moving-out flip structure includes a detection plate installed on the rotating plate near the opening position, the detection plate is provided with a first groove on one side away from the vertical rod, the detection plate is provided with a moving-out groove connected with the first groove, the two inner groove walls opposite to the moving groove are provided with a sliding groove, a slider is slidably provided in the sliding groove, and a moving bar is connected between the two sliders in each group, and a second groove is provided on the lower side of the moving bar away from the vertical rod, and a rotating shaft is rotatably connected between the groove walls at both ends of the second groove, and a moving plate is movably sleeved in the middle of the rotating shaft; Baffles are connected to both sides of each detection plate on the rotating plate; The support structure is provided with a push-pull structure for driving one side of the moving bar.

[0006] Preferably, the push-pull structure includes a plurality of through-holes opened on the inner wall of the fixed cover near the position of each detection plate, each of the through-holes is provided with a driving bar movably passing through, one end of each of the driving bars is respectively connected to the corresponding moving bar, and the other end of each of the driving bars is connected to a driving plate, each of the driving plates is provided with a first guide groove near the lower position, and each of the driving plates is provided with a second guide groove near the upper position, the bottom end of the second guide groove is connected to the top end of the first guide groove, and the first guide groove and the second guide groove are both "S" shaped, and driving rings are movably passed through the bottom ends of the plurality of first guide grooves, and a plurality of second connecting plates are fixedly sleeved on the driving ring, and the bottom of each of the second connecting plates is respectively connected to the top end of the output shaft of the corresponding electric telescopic rod, and the bottom end of the electric telescopic rod is installed on the supporting structure.

[0007] Preferably, the collection structure includes a plurality of storage slots opened on the side of the base, the storage slots are arranged at positions corresponding to the openings, a collection frame is movably inserted into each of the storage slots, and a handle is installed on the side of the collection frame away from the base.

[0008] Preferably, a plurality of knocking rods are connected to the lower edge of the rotating plate, each of the knocking rods is arranged at a position corresponding to the opening, and a knocking block of a desired shape is installed on one end of each of the knocking rods.

[0009] Preferably, the driving structure includes a motor installed in a motor box, and the motor output shaft passes through the top of the motor box and is connected to a turn block, and the turn block is inserted into a bottom groove opened at the bottom end of the vertical rod, and two connecting rods are connected to the turn block, and both of the connecting rods are movable through the bottom groove, and the top of the connecting rod is connected to the rotating plate, and a through groove for the connecting rod to pass through is opened in the middle of the bottom of the fixed cover.

[0010] Preferably, the support structure includes an annular groove opened at the upper edge of the base, a swivel is movably inserted into the annular groove, the top of the swivel is connected to a support ring, and a plurality of support rods are connected to the top of the support ring, and the top of each support rod is connected to the rotating plate.

[0011] Preferably, the detection structure includes a top plate connected to the top of the vertical rod, a cylinder is installed on the top of the top plate, the top of the cylinder output shaft is connected to a lifting block, the side of the lifting block corresponding to the position of each transparent window is connected to a lifting rod, the bottom end of each lifting rod is connected to a detection block, the detection block moves through the top of the fixed cover, and the middle of the bottom of each detection block is connected to a first limit block.

[0012] Preferably, a second limiting block is connected to the middle of the upper side of each movable plate, and the second limiting block has the same size as the first limiting block.

[0013] In summary, the present invention has the following beneficial technical effects: 1. The present invention is provided with a removal and flipping structure and a collection structure, and a baffle is provided on the rotating plate of the removal and flipping structure, and the rotating plate is arranged in the fixed cover, so that when the rotating plate drives the spring to be tested to rotate the detection position in the fixed cover for testing, the baffle and the fixed cover can be used to form a closed protective structure. In the face of the sudden breakage of the spring, the protective function can be activated, and when the removal and flipping structure is moved, the tested spring can be pushed out of the fixed cover for easy removal, and then the broken spring can be automatically poured into the collection structure for automatic collection by automatically flipping the movable plate on the removal and flipping structure, which is more labor-saving and convenient to operate. 2. The present invention is provided with a push-pull structure. The push-pull structure can first automatically push out the movable plate from the fixed cover. At this time, the movable plate is in a horizontal state, which is convenient for taking the spring on the movable plate. The push-pull structure is then used to continue pushing out the movable plate. With the automatic gravity of the movable plate, the movable plate can automatically rotate down to pour out and collect the broken springs. A knocking rod and a knocking block are provided under the rotating plate, so that the movable plate hits the knocking block when it rotates down. The vibration generated on the movable plate is used to shake off the debris adhering to the movable plate, so that the broken spring can be cleaned more thoroughly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a spring fatigue detection device with a protective structure according to an embodiment of the present invention; Figure 2 This is a schematic structural diagram of a collection structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the base after it is disassembled in an embodiment of the present invention; Figure 4 This is a schematic structural diagram of a fixed cover in an embodiment of the present invention; Figure 5 2 is a schematic structural diagram of a rotating plate, a push-pull structure, and a driving structure in an embodiment of the present invention; Figure 6 In the embodiment of the present invention Figure 5 A magnified view of the structure at point A; Figure 7 This is the structure of the moving strip and the moving plate in the embodiment of the present invention; Figure 8 Schematic diagram of the structure below the moving bar and the moving plate in an embodiment of the present invention.

[0015] Explanation of reference numerals: 1, bottom plate; 2, base; 3, motor box; 4, vertical rod; 5, fixed cover; 6, first connecting plate; 7, opening; 8, rotating plate; 9, transparent window; 10, detection plate; 11, first groove; 12, moving plate; 13, moving bar; 14, slider; 15, rotating shaft; 16, second groove; 17, baffle; 18, through-hole; 19, driving bar; 20, driving plate; 21, first guide groove; 22, second guide groove; 23, driving ring; 2 4. Electric telescopic rod; 25. Second connecting plate; 26. Storage slot; 27. Collection frame; 28. Handle; 29. ​​Knocking rod; 30. Knocking block; 31. Turning block; 32. Connecting rod; 33. Bottom slot; 34. Passing slot; 35. Support rod; 36. Support ring; 37. Ring groove; 38. Turning ring; 39. Top plate; 40. Lifting block; 41. Lifting rod; 42. Detection block; 43. Cylinder; 44. First limit block; 45. Second limit block; 46. Moving out slot. DETAILED DESCRIPTION

[0016] The following is combined with Figures 1-8 The present invention is described in further detail.

[0017] Reference Figures 1-8 The embodiment of the present invention discloses a spring fatigue detection device with a protective structure, comprising a bottom plate 1, a motor box 3 is installed in the middle of the upper part of the bottom plate 1, a base 2 is installed on the outer side of the motor box 3 on the top of the bottom plate 1, a collecting structure is provided on the base 2, a vertical rod 4 is fastened with bolts at the middle part of the top end of the motor box 3, a plurality of first connecting plates 6 are connected to the side of the vertical rod 4 near the top end, and the plurality of first connecting plates 6 are distributed at equal angles on the circumference of the vertical rod 4, and the ends of the plurality of first connecting plates 6 away from the vertical rod 4 are all connected to the inner wall of the fixed cover 5, the fixed cover 5 is a hollow ring shape, and a rotating plate 8 is movably provided on the lower inner wall of the fixed cover 5, and the lower side of the rotating plate 8 is tightly attached to the lower inner wall of the fixed cover 5, and the rotating plate 8 is a ring shape, a driving structure is provided between the motor box 3 and the rotating plate 8, and a detection structure is provided at the top end of the vertical rod 4; A plurality of openings 7 are provided on one side of the fixed cover 5 away from the vertical rod 4 and are distributed at equal angles around the circumference. A plurality of transparent windows 9 are installed on one side of the fixed cover 5 away from the vertical rod 4. The transparent windows 9 are made of tempered glass and are spaced apart from the openings 7. A removable and flipping structure is provided on the upper surface of the rotating plate 8 near the opening 7. A supporting structure is provided between the lower surface of the rotating plate 8 and the base 2. The moving-out flip structure includes a detection plate 10 installed on the rotating plate 8 near the opening 7. A first groove 11 is provided on the side of the detection plate 10 away from the vertical rod 4. A moving-out groove 46 connected to the first groove 11 is provided on the detection plate 10. The two inner groove walls opposite to the moving groove 46 are provided with a slide groove. A slider 14 is provided for sliding in the slide groove. A moving bar 13 is connected between the two sliders 14 of each group. A second groove 16 is provided on the side away from the vertical rod 4 below the moving bar 13. A rotating shaft 15 is rotatably connected between the groove walls at both ends of the second groove 16. A moving plate 12 is movably sleeved in the middle of the rotating shaft 15. A blocking edge is provided on the edge of the moving plate 12, so that when the rotating plate 8 drives the moving plate 12 to rotate out of the fixed cover 5 to the opening 7, The broken spring and the generated debris can be shielded to reduce the rolling of the spring on the rotating movable plate 12. When the broken spring needs to be cleaned after detection, first, the movable plate 12 can be pushed out from the opening 7 by sliding the slider 14 in the slide groove. At this time, since the movable plate 12 is supported in the first groove 11, the movable plate 12 is in a horizontal state. In this way, Fang Bo Ni takes the tested spring from the movable plate 12. When continuing to move the movable plate 12, the movable plate 12 is pushed out from the first groove 11. At this time, the movable plate 12 loses support. Under the action of the gravity of the movable plate 12 itself, the movable plate 12 flips downward with the rotating shaft 15 as the axis, and then the broken spring is automatically poured out and collected, thereby realizing automatic cleaning of the broken spring. Baffles 17 are connected to both sides of each detection plate 10 on the rotating plate 8. When the rotating plate 8 drives the movable plate 12 and the spring to be detected to the detection position in the fixed cover 5, the baffles 17 and the fixed cover 5 form a closed space, which can shield the broken spring during detection, thereby realizing a safety protection function. The support structure is provided with a push-pull structure for driving one side of the moving bar 13 .

[0018] See also Figures 1-8The push-pull structure includes a plurality of through-holes 18 provided on the inner wall of the fixed cover 5 near each detection plate 10. A driving bar 19 is movable through each through-hole 18. The side of the driving bar 19 is close to the inner wall of the through-hole 18. One end of each driving bar 19 is connected to the corresponding moving bar 13. The other end of each driving bar 19 is connected to a driving plate 20. A first guide groove 21 is provided on each driving plate 20 near the lower position. A second guide groove 22 is provided at each end, and the bottom end of the second guide groove 22 is connected to the top end of the first guide groove 21. The first guide groove 21 and the second guide groove 22 are both in an "S" shape. The bottom ends of the multiple first guide grooves 21 are all movable through a driving ring 23, and a plurality of second connecting plates 25 are fixedly sleeved on the driving ring 23. The bottom of each second connecting plate 25 is respectively connected to the top end of the output shaft of the corresponding electric telescopic rod 24. The bottom end of the electric telescopic rod 24 is installed on the supporting structure. When the movable plate is pushed out, When the spring 12 is removed from the first groove 11, the moving plate 12 loses its support. At this time, under the action of the gravity of the moving plate 12 itself, the moving plate 12 automatically rotates down, thereby pouring out and collecting the broken spring and the generated debris, making the operation more labor-saving and convenient. The collection structure includes a plurality of receiving grooves 26 provided on the side of the base 2. The receiving grooves 26 are provided at positions corresponding to the openings 7. A collection frame 27 is movably inserted into each receiving groove 26. A handle 28 is installed on a side of the collection frame 27 away from the base 2. The collection frame 27 is provided at a position corresponding to the opening 7 so that when the movable plate 12 rotates to pour out broken springs and debris, the collection frame 27 can collect the broken springs and debris. The handle 28 can be used to conveniently pull the collection frame 27 out of the receiving groove 26, thereby facilitating centralized processing of the collected broken springs and debris. A plurality of knocking rods 29 are connected to the lower edge of the rotating plate 8, each knocking rod 29 is set at the position of the opening 7, and a knocking block 30 of a desired shape is installed on one end of each knocking rod 29. When the movable plate 12 rotates down, the movable plate 12 hits the knocking block 30, and the vibration generated by the collision can be shaken off the debris adhering to the movable plate 12, so that the movable plate 12 can be cleaned more thoroughly.

[0019] See also Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 The driving structure includes a motor installed in the motor box 3, and the motor output shaft passes through the top of the motor box 3 and is connected to a rotating block 31. The rotating block 31 is inserted into the bottom groove 33 provided at the bottom end of the vertical rod 4. Two connecting rods 32 are connected to the rotating block 31. The two connecting rods 32 are movable and pass through the bottom groove 33. The top of the connecting rod 32 is connected to the rotating plate 8. A through-groove 34 for the connecting rod 32 to pass through is provided in the middle of the lower side of the fixed cover 5. When the motor in the motor box 3 is started to drive the rotating plate 8 at one end of the connecting rod 32 to rotate, the spring on the movable plate 12 can be rotated into the fixed cover 5. The detection position can automatically turn the detected spring out to the opening 7 for unloading; the supporting structure includes an annular groove 37 provided on the upper edge of the base 2, and a swivel 38 is movably inserted into the annular groove 37. The top of the swivel 38 is connected to a support ring 36, and the top of the support ring 36 is connected to multiple support rods 35. The top of each support rod 35 is connected to the rotating plate 8. When the rotating plate 8 rotates, it drives the support rod 35 and the support ring 36 to rotate as a whole, thereby increasing the support stability of the rotating plate 8, thereby better detecting the spring, and the electric telescopic rod 24 is installed on the support ring 36, so that the electric telescopic rod 24 can rotate synchronously with the rotating plate 8, thereby smoothly pushing out or pulling in the movable plate 12; the detection structure includes a top plate 39 connected to the top of the vertical rod 4, a cylinder 43 is installed on the top of the top plate 39, the top of the output shaft of the cylinder 43 is connected to a lifting block 40, and the side of the lifting block 40 corresponding to the position of each transparent window 9 is connected to a lifting rod 41, and the bottom end of each lifting rod 41 is connected to a detection block 42, the detection block 42 moves through the top of the fixed cover 5, and the middle of the bottom of each detection block 42 is connected There is a first limit block 44. When the spring moves to the position directly below the detection block 42, the cylinder 43 is started to drive the multiple detection blocks 42 to move downward, and at the same time, fatigue detection work is performed on multiple springs to improve the detection efficiency; a second limit block 45 is connected to the middle of the upper part of each movable plate 12. The second limit block 45 has the same size as the first limit block 44. During detection, the first limit block 44 and the second limit block 45 are respectively inserted into the two ends of the spring to avoid the problem of the spring popping out when the spring is pressed for detection, thereby improving the detection efficiency.

[0020] The implementation principle of a spring fatigue detection device with a protective structure according to an embodiment of the present invention is as follows: first, the electric telescopic rod 24 is started to drive the driving ring 23 to slide upward in the first guide groove 21 of the driving plate 20, and by squeezing the groove wall of the first guide groove 21, the driving bar 19 drives the movable plate 12 on the movable bar 13 to move out of the opening 7. At this time, the movable plate 12 is supported on the groove wall of the first groove 11, and the movable plate 12 is in a horizontal state. Then, the multiple springs to be tested are respectively inserted into the second limit block 45 on the movable plate 12, and then the electric telescopic rod 24 drives the driving ring 23 to slide downward in the first guide groove 21 to pull the movable bar 13 and the movable plate 12 move in the opposite direction to reset. When the movable plate 12 is completely inserted into the first groove 11, the motor in the motor box 3 is started, and the rotating plate 8 is driven to rotate through the connecting rod 32, so that the spring on the movable plate 12 is rotated to the position of the first limit block 44, and the two baffles 17 of each group cooperate with the fixed cover 5 to form a closed space at the peripheral side of the movable plate 12 to play a role in safety protection. Then the cylinder 43 is started to drive the lifting block 40, the lifting rod 41 and the detection block 42 to move up and down as a whole. The detection block 42 that moves up and down is used to squeeze the spring multiple times to detect the fatigue of the spring, and in the process of detection, the first limit block 44 is used to detect the fatigue of the spring. The second limit block 45 is respectively inserted into the two ends of the spring, which can play a limiting role at both ends of the spring, reducing the problem of the spring sound shape popping out during the detection process, and improving the detection work efficiency. After the detection, the motor drives the rotating plate 8 to rotate in the opposite direction to drive the movable plate 12 to move back to the position of the opening 7, and starts the electric telescopic rod 24 to drive the driving ring 23 to slide upward in the first guide groove 21, pushing the movable plate 12 and the movable bar 13 to slide as a whole in the first groove 11 to push the movable plate 12 out of the opening 7. At this time, the staff can manually take out the spring that has been tested and has not been broken on the movable plate 12, and then the electric telescopic rod 24 drives the driving ring 23 to slide upward in the first guide groove 21, and push the movable plate 12 and the movable bar 13 to slide as a whole in the first groove 11 to push the movable plate 12 out of the opening 7. The driving ring 23 slides upward in the second guide groove 22 to continue to push the movable plate 12 to move. When the movable plate 12 is completely pushed out of the first groove 11, the movable plate 12 loses its support. Under the action of the movable plate 12's own gravity, the movable plate 12 rotates downward with the rotating shaft 15 as the axis to pour the broken springs from the movable plate 12 into the corresponding collection frame 27 below for collection. In the process of the movable plate 12 rotating downward, the movable plate 12 hits the knocking block 30, and the vibration generated on the movable plate 12 is used to shake the spring debris adhered to the movable plate 12 into the collection frame 27 for collection, thereby realizing the automatic collection function of the broken springs, and the operation is more labor-saving and convenient.

[0021] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A spring fatigue detection device with a protective structure, comprising a base plate (1), characterized in that: A motor box (3) is installed in the middle of the upper part of the bottom plate (1); a base (2) is installed on the upper part of the bottom plate (1) at the outer side of the motor box (3); a collecting structure is arranged on the base (2); a vertical rod (4) is fastened with bolts in the middle of the top of the motor box (3); a plurality of first connecting plates (6) are connected to the side of the vertical rod (4) near the top; the plurality of first connecting plates (6) are distributed at equal angles on the circumference of the vertical rod (4); the ends of the plurality of first connecting plates (6) away from the vertical rod (4) are connected to the inner wall of a fixed cover (5); the fixed cover (5) is in the shape of a hollow ring; a rotating plate (8) is movably arranged on the lower inner wall of the fixed cover (5); the rotating plate (8) is in the shape of a ring; a driving structure is arranged between the motor box (3) and the rotating plate (8); a detection structure is arranged at the top of the vertical rod (4); A plurality of openings (7) distributed at equal angles around the circumference are provided on a side surface of the fixed cover (5) away from the vertical rod (4); a plurality of transparent windows (9) are installed on a side surface of the fixed cover (5) away from the vertical rod (4); the transparent windows (9) and the openings (7) are arranged at intervals; a moving-out flipping structure is provided on the upper surface of the rotating plate (8) near the openings (7); and a supporting structure is provided between the lower surface of the rotating plate (8) and the base (2); The removal and flipping structure comprises a detection plate (10) mounted on the rotating plate (8) near the opening (7); a first groove (11) is provided on a side of the detection plate (10) away from the vertical rod (4); a removal groove (46) connected to the first groove (11) is provided on the detection plate (10); two inner groove walls opposite to the removal groove (46) are provided with sliding grooves; a slider (14) is slidably arranged in the sliding groove; a moving bar (13) is connected between the two sliders (14) in each group; a second groove (16) is provided below the moving bar (13) on a side away from the vertical rod (4); a rotating shaft (15) is rotatably connected between the groove walls at both ends of the second groove (16); a moving plate (12) is movably sleeved in the middle of the rotating shaft (15); Baffles (17) are connected to both sides of each detection plate (10) on the rotating plate (8); The support structure is provided with a push-pull structure for driving one side of the moving bar (13); The detection structure comprises a top plate (39) connected to the top of the vertical rod (4), a cylinder (43) is installed on the top of the top plate (39), a lifting block (40) is connected to the top of the output shaft of the cylinder (43), a lifting rod (41) is connected to the side of the lifting block (40) at a position corresponding to each transparent window (9), a detection block (42) is connected to the bottom end of each lifting rod (41), the detection block (42) movably passes through the top of the fixed cover (5), and a first limit block (44) is connected to the middle of the bottom of each detection block (42); The collecting structure comprises a plurality of receiving grooves (26) provided on the side of the base (2), the receiving grooves (26) being arranged at positions corresponding to the openings (7), a collecting frame (27) being movably inserted into each of the receiving grooves (26), and a handle (28) being installed on a side surface of the collecting frame (27) away from the base (2); A plurality of knocking rods (29) are connected to the lower edge of the rotating plate (8), each of the knocking rods (29) is arranged at a position corresponding to the opening (7), and a knocking block (30) of a desired shape is installed on one end of each of the knocking rods (29).

2. The spring fatigue detection device with a protective structure according to claim 1, characterized in that: The driving structure comprises a motor installed in a motor box (3); a rotating block (31) is connected to the top of the motor output shaft passing through the motor box (3); the rotating block (31) is inserted into a bottom groove (33) provided at the bottom end of the vertical rod (4); two connecting rods (32) are connected to the rotating block (31); both connecting rods (32) are movably passed through the bottom groove (33); the top ends of the connecting rods (32) are connected to the rotating plate (8); and a passing groove (34) for the connecting rods (32) to pass through is provided in the middle of the lower side of the fixed cover (5).

3. The spring fatigue detection device with a protective structure according to claim 2 is characterized in that: A second limit block (45) is connected to the middle of the upper side of each movable plate (12), and the second limit block (45) has the same size as the first limit block (44).

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