Spring anti-fatigue structure

Abstract

The utility model discloses a spring anti-fatigue structure, which belongs to the technical field of spring durability test equipment, and comprises two groups of clamp groups which are arranged in a mutually aligned manner, at least one group of clamp group is periodically adjusted by a connecting rod group, each clamp group comprises a top cover and a bottom cover, and driving groups are arranged in the top cover and the bottom cover. At least two sets of limiting sliding grooves are formed in the top of the top cover, inner sliding blocks which are arranged in the limiting sliding grooves and driven and adjusted by a driving set are arranged in the limiting sliding grooves, a hanging-ring-free spring containing base is arranged at the tops of the inner sliding blocks, and groove parts are formed in the top of the hanging-ring-free spring containing base; a first pressure sensor is arranged in a groove part of the hanging-ring-free spring placing seat, the first pressure sensor receives a hanging-ring-free spring placed in the groove part of the hanging-ring-free spring placing seat, a tension detection hanging ring is arranged in the middle of the top of the top cover, and a second pressure sensor is arranged in the tension detection hanging ring. And the tension detection hanging ring is used for hanging a hanging ring spring.

Description

TECHNICAL FIELD

[0001] The utility model relates to a spring durability test equipment, in particular to a spring fatigue resistance structure belongs to spring durability test equipment technical field. BACKGROUND

[0002] The prior art such as the air spring fatigue test device of CN109060338A discloses a kind of, including base and bottom plate, opposite fixed with cartridge holder on base, cartridge holder inside is equipped with clamping groove, opposite clamping groove inside is equipped with ladder groove, ladder groove bottom is equipped with spring, bottom plate bottom is fixed with the clamping block that is cooperated with clamping groove, clamping block side is equipped with the sliding block that is cooperated with ladder groove, bottom plate is fixed with first support rod, second support rod and third support rod, first support rod top is fixed with motor, motor is connected with the one end of first connecting rod by driving shaft, the other end of first connecting rod is connected with the one end of second connecting rod by pivot, the other end of second connecting rod is connected with the one end of pressing rod by pivot, the other end of pressing rod is fixed with first mounting seat, pressing rod is equipped with sleeve outside.

[0003] After searching and analyzing, we think that the prior art adopts multi-linkage rod structure to push the groove structure of spring clamping to realize the function of cyclically pressing spring, the technical scheme can realize linkage pressing spring, but the prior art cannot realize the function of detecting different types of springs and the function of synchronously detecting different types of springs, because the prior art is mainly divided into spring without ring and spring with ring, so a spring fatigue resistance structure is designed to solve the above problems. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a kind of spring fatigue resistance structure.

[0005] The purpose of the utility model can be achieved by adopting the following technical scheme:

[0006] A kind of spring fatigue resistance structure, including two groups of mutually opposite setting clamp groups, at least one clamp group is periodically adjusted by connecting rod group, clamp group includes top cover and bottom cover, top cover and bottom cover inside are provided with drive group;

[0007] At least two groups of limit sliding slots are arranged on the top of top cover, and inner sliding block driven and adjusted by drive group is arranged in the limit sliding slot;

[0008] The top of inner sliding block is provided with ringless spring placing seat, and recessed portion is opened on the top of ringless spring placing seat, and the top of ringless spring placing seat is provided with protrusion, the recessed portion of the ringless spring placing seat is provided with first pressure sensor, and the first pressure sensor receives ringless spring placed in the recessed portion of ringless spring placing seat;

[0009] A tension detection hanging ring is arranged in the top middle part of the top cover, and a second pressure sensor is arranged in the tension detection hanging ring, and the tension detection hanging ring is used for hanging the hanging ring spring.

[0010] Preferably, the distance adjusting group adjusts the distance between the two groups of clamp groups.

[0011] The bottom of the bracket is provided with a clamping seat group for clamping the bracket on the plate-shaped structure.

[0012] Preferably, the distance adjusting group comprises an auxiliary adjusting plate, a first limiting strip hole, an adjusting rod, an adjusting screw, a spring length adjusting motor, a T-shaped sliding limiting piece and a back plate.

[0013] The back plate is provided with an auxiliary adjusting plate on the top, and the auxiliary adjusting plate is provided with a first limiting strip hole in the middle part in the axial direction, and a T-shaped sliding limiting piece is inserted into the first limiting strip hole and slides in the first limiting strip hole, and the end of the T-shaped sliding limiting piece is provided with an adjusting rod.

[0014] The top middle part of the auxiliary adjusting plate is provided with a spring length adjusting motor, and the output end of the spring length adjusting motor is provided with an adjusting screw which penetrates through the adjusting rod and is in mesh with the adjusting rod, and the back middle part of the adjusting rod is fixed with the bracket.

[0015] Preferably, the distance adjusting group comprises an auxiliary adjusting plate, a first limiting strip hole, an adjusting rod, an adjusting screw, a spring length adjusting motor, a T-shaped sliding limiting piece and a back plate.

[0016] The back plate is provided with an auxiliary adjusting plate on the top, and the auxiliary adjusting plate is provided with a first limiting strip hole in the middle part in the axial direction, and a T-shaped sliding limiting piece is inserted into the first limiting strip hole and slides in the first limiting strip hole, and the end of the T-shaped sliding limiting piece is provided with an adjusting rod.

[0017] The outer edge of the front surface of the linkage turntable is hinged with a first hinged rod, the output end of the first hinged rod is hinged with a second hinged rod, the second hinged rod is provided with a second limiting strip hole in the axial direction, a work-shaped bracket is inserted into the second limiting strip hole to limit the movement of the second hinged rod, and the second hinged rod is hinged with the top or bottom cover.

[0018] Preferably, the top middle part of the top cover is provided with an inner adjusting screw, and an outer adjusting cylinder is meshed with the outer side of the inner adjusting screw, the top of the outer adjusting cylinder is provided with a tension detection hanging ring, and the outer adjusting cylinder rotates to adjust the distance between the tension detection hanging ring and the top cover to adapt to the hanging ring spring.

[0019] Preferably, the driving group comprises a motor bracket, a tabletop clamping piece, a driving bevel gear, a driven bevel gear and a clamping distance adjusting screw.

[0020] The inner bottom middle part of the bottom cover is provided with a motor bracket, one side middle part of the motor bracket is provided with a tabletop clamping piece, the output end of the tabletop clamping piece is provided with a driving bevel gear, the outer side of the driving bevel gear is meshed with a driven bevel gear, the side middle part of the driven bevel gear is provided with a clamping distance adjusting screw which penetrates into a limiting sliding groove, and the clamping distance adjusting screw is meshed with the inner sliding block.

[0021] Preferably, the clamping seat assembly includes a C-shaped clamping seat, a desktop clamping piece and a clamping screw;

[0022] A C-shaped clamping seat is installed at the bottom of the bracket, and a clamping screw is provided on the top of the C-shaped clamping seat, which passes through the top of the C-shaped clamping seat and engages with the C-shaped clamping seat. A desktop clamping piece is installed at the bottom of the clamping screw, and the bottom of the bracket is fixed to the top of the C-shaped clamping seat.

[0023] Preferably, the bottom cover below is fixed with a bottom fixing plate, a connecting rod is installed on the side of the bottom fixing plate, and the other end of the connecting rod is fixed to the bottom of the bracket side.

[0024] Preferably, the top cover is fixed to the bottom cover by means of a fixing bolt and an adjusting screw that engage with each other;

[0025] The fixing bolt has a polygonal structure and a strip-shaped slot is provided on the top of the fixing bolt for removal with a flat-blade screwdriver.

[0026] Preferably, the edge of the first pressure sensor is electrically connected to a wire that is inserted into the top cover and then led out into the bottom cover for wiring.

[0027] Beneficial technical effects of the utility model:

[0028] The utility model provides a spring anti-fatigue structure, which realizes the function of testing two different types of springs, namely, springs with and without hanging rings. The tension detection ring is arranged at the top of the top cover, and the spring placement seat for the spring without hanging ring is arranged near the edge of the top cover. Therefore, when the diameters of the spring without and with hanging rings are different, the spring without and with hanging rings can be tested at the same time.

[0029] The back of the back plate is provided with a screw rod for installing an auxiliary adjusting plate, a first limiting strip opening is formed in the middle of the auxiliary adjusting plate along the axial direction of the middle of the auxiliary adjusting plate, a spring length adjusting motor is installed on the top of the auxiliary adjusting plate, an adjusting screw rod is installed on the output end of the spring length adjusting motor, the adjusting screw rod penetrates through an adjusting rod and is in mesh with the adjusting rod, a T-shaped sliding limiting piece is installed on the other end of the adjusting rod, the T-shaped sliding limiting piece penetrates through the first limiting strip opening, and a bracket is installed on the middle of the adjusting rod, because the adjusting rod is in mesh with the adjusting screw rod, when the spring length adjusting motor drives the adjusting screw rod to rotate, the auxiliary adjusting plate can be driven to ascend or descend, so that the back plate fixed with the auxiliary adjusting plate can adjust the distance between the upper clamp set and the lower clamp set, so as to adapt to the no-loop spring or / and the loop spring with different lengths, and in the case that the size is unchanged, the no-loop spring or / and the loop spring with different strength pressure or tension adjusting functions can be realized, so that the no-loop spring or / and the loop spring can be tested in the case of different strength durability.

[0030] A c-shaped clamping seat is installed on the bottom of the bracket, the c-shaped clamping seat can be inserted on the desktop, then the clamping screw rod drives the desktop clamping piece to realize the clamping of the desktop, so that the bracket can be fixed on the structure with a sheet-shaped plate body, and the functions of convenient disassembly and fixation are realized. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a first perspective view of the overall device according to the preferred embodiment of the spring fatigue-resistant structure of the utility model.

[0032] Figure 2 It is a second perspective view of the overall device according to the preferred embodiment of the spring fatigue-resistant structure of the utility model.

[0033] Figure 3 It is a third perspective view of the overall device according to the preferred embodiment of the spring fatigue-resistant structure of the utility model.

[0034] Figure 4 It is a first perspective view of the clamp set according to the preferred embodiment of the spring fatigue-resistant structure of the utility model.

[0035] Figure 5 It is a perspective view of the overall device containing the no-loop type spring according to the preferred embodiment of the spring fatigue-resistant structure of the utility model.

[0036] Figure 6 It is a perspective view of the overall device containing the loop type spring according to the preferred embodiment of the spring fatigue-resistant structure of the utility model.

[0037] Figure 7 For the utility model Figure 5 The structure of a place in the utility model

[0038] Figure 8 For the utility model Figure 6 The structure of a place in the utility model

[0039] Figure 9 It is first perspective solid structure schematic diagram of link group, distance adjusting group combination of a preferred embodiment of spring fatigue resistance structure according to the utility model.

[0040] Figure 10 It is second perspective solid structure schematic diagram of link group, distance adjusting group combination of a preferred embodiment of spring fatigue resistance structure according to the utility model.

[0041] Figure 11 For the utility model Figure 6 The structure of a place in the utility model

[0042] Figure 12 It is second perspective solid structure exploded view of clamp group of a preferred embodiment of spring fatigue resistance structure according to the utility model.

[0043] Figure 13 It is third perspective solid structure exploded view of clamp group of a preferred embodiment of spring fatigue resistance structure according to the utility model.

[0044] In the drawing: 1, support, 2, connecting rod, 3, adjusting rod, 4, auxiliary adjusting plate, 5, first limit strip mouth, 6, linkage turntable, 7, first hinged rod, 8, second hinged rod, 9, back plate, 10, bottom cover, 11, top cover, 12, clamping seat, 13, adjusting screw, 14, fixed bolt, 15, limit sliding slot, 16, no hanging ring spring placing seat, 17, first pressure sensor, 18, second limit strip mouth, 19, no hanging ring spring, 20, have hanging ring spring, 21, I-shaped frame, 22, bottom fixed sheet, 23, spring detection motor, 24, spring length adjusting motor, 25, T-shaped sliding limit piece, 26, c-shaped clamping seat, 27, clamping screw, 28, motor frame, 29, desktop clamping sheet, 30, driving bevel gear, 31, driven bevel gear, 32, clamping distance adjusting screw, 33, tension detection hanging ring, 34, outer adjusting cylinder, 35, inner adjusting screw, 36, inner sliding block. DETAILED DESCRIPTION

[0045] In order to make the person skilled in the art more clear and definite the technical scheme of the utility model, the utility model is described in further detail below in conjunction with examples and drawings, but the implementation mode of the utility model is not limited to this.

[0046] AsFigures 1-3 It can be known that the overall structure diagram of the utility model can be observed, and it can be known from the diagram that a group of clamp sets are arranged at the end of the connecting rod 2, and another group of clamp sets are arranged above the group of clamp sets, so that the spring can be placed between the two groups of clamp sets, and the spring can be placed in the two groups of clamp sets through the clamp sets. Figure 4 It can be known that the clamp sets are installed together by the engagement relationship between the fixing bolts 14 and the adjusting screw rods 13, a group of cavity structures are formed between the top cover 11 and the bottom cover 10, a plurality of limiting sliding grooves 15 are formed at the top of the top cover 11, the inner sliding blocks 36 that can slide in the limiting sliding grooves 15 are placed in the limiting sliding grooves 15, the non-loop spring placing seats 16 are installed at the top of the inner sliding blocks 36, the top middle part of the non-loop spring placing seats 16 is provided with a notch, and the both sides are protruding, so that the end edge part of the non-loop spring 19 can be placed in the notch in the top middle part of the non-loop spring placing seat 16, and the first pressure sensor 17 is attached to the notch in the top middle part of the non-loop spring placing seat 16, so that the pressure generated by the end part of the non-loop spring 19 can be detected, and because the notch is provided in the top middle part of the non-loop spring placing seat 16, the both sides are protruding, and the non-loop spring 19 placed in the notch in the top middle part of the non-loop spring placing seat 16 can be limited by the both sides, so that the problem of deviation of the non-loop spring 19 can be prevented.

[0047] As shown in Figure 4 and Figure 13 It can be known that the inner adjusting screw rod 35 is installed at the top middle part of the top cover 11, the outer adjusting cylinder 34 is engaged with the outer side of the inner adjusting screw rod 35, the tension detection loop 33 is installed at the top of the outer adjusting cylinder 34, and the second pressure sensor is arranged at the inner side of the tension detection loop 33, so that the loop spring 20 can be hung on the tension detection loop 33, and the both ends of the loop spring 20 are in contact with the second pressure sensor at the inner side of the tension detection loop 33, so that the tension generated by the loop spring 20 can be detected, and the specific suspension is shown in Figures 6-8 .

[0048] As shown in Figure 4 and Figure 13 The tension detection loop 33 is arranged at the top of the top cover 11, and the non-loop spring placing seat 16 is arranged at the top of the top cover 11 close to the edge, so that when the diameters of the non-loop spring 19 and the loop spring 20 are different, the non-loop spring 19 and the loop spring 20 can be detected at the same time.

[0049] As shown in Figure 12 andFigure 4 It can be known that the motor frame 28 is installed on the inner bottom of the bottom cover 10, and the tabletop clamping piece 29 is installed on the motor frame 28, the output end of the tabletop clamping piece 29 is installed with the driving bevel gear 30, and the driven bevel gear 31 is engaged on the outer side of the driving bevel gear 30, the clamping distance adjusting screw 32 is installed through the limiting sliding groove 15 and is engaged with the inner sliding block 36, so that the tabletop clamping piece 29 is started to drive the driving bevel gear 30, then the driving bevel gear 30 drives the driven bevel gear 31, the driven bevel gear 31 adjusts the rotation of the clamping distance adjusting screw 32, and the inner sliding block 36 adjusts the sliding function of the inner sliding block 36 in the limiting sliding groove 15, because the inner sliding block 36 and the ring-free spring placing seat 16 are in an installed relationship, so as to drive the ring-free spring placing seat 16 to adjust, so as to adapt to ring-free springs 19 of different diameters.

[0050] Again, the Figures 1 to 3 It can be known that the upper clamp group is provided with a connecting rod group for driving the clamp group, such as Figure 9 And Figure 10 It can be known that the back plate 9 is provided, and the spring detection motor 23 is installed at the side top middle part of the back plate 9, the output end of the spring detection motor 23 is installed with the linkage turntable 6, the outer side of the linkage turntable 6 is hinged with the first hinged rod 7, the other end of the first hinged rod 7 is hinged with the second hinged rod 8, and the second limiting slot 18 is opened on the second hinged rod 8 in the axial direction of the second hinged rod 8, the I-shaped frame 21 is penetrated in the second limiting slot 18, and the I-shaped frame 21 is fixed on the back plate 9 through a screw rod, the spring detection motor 23 is started to drive the linkage turntable 6 to rotate, the linkage turntable 6 drives the first hinged rod 7 to move, the first hinged rod 7 adjusts the second hinged rod 8 to move up and down, and the second limiting slot 18 can realize the function of limiting the movement of the second hinged rod 8, because the bottom of the second hinged rod 8 is hinged with the upper clamp group, so as to adjust the upper clamp group to realize the function of periodic up and down adjustment, so as to continuously drive the ring-free spring 19 or / and the ring spring 20 to realize the function of detecting the ring-free spring 19 or / and the ring spring 20.

[0051] Continue to watch Figure 9 And Figure 10It can be known that the auxiliary adjusting plate 4 is installed on the back of the back plate 9 through the screw rod, the middle part of the auxiliary adjusting plate 4 is provided with the first limiting strip opening 5 along the axial direction of the middle part of the auxiliary adjusting plate 4, the spring length adjusting motor 24 is installed on the top of the auxiliary adjusting plate 4, then the output end of the spring length adjusting motor 24 is provided with the adjusting screw rod 13, the adjusting screw rod 13 penetrates through the adjusting rod 3 and is engaged with the adjusting rod 3, the other end of the adjusting rod 3 is provided with the T-shaped sliding limiting piece 25, the T-shaped sliding limiting piece 25 penetrates through the first limiting strip opening 5, and the middle part of the adjusting rod 3 is provided with the bracket 1, the bracket 1 is installed on the back plate 9 through Figures 1 to 3 It can be known that, because the adjusting rod 3 is engaged with the adjusting screw rod 13, when the spring length adjusting motor 24 drives the adjusting screw rod 13 to rotate, the auxiliary adjusting plate 4 can be driven to ascend or descend, so that the back plate 9 fixed with the auxiliary adjusting plate 4 can adjust the distance between the upper clamp group and the lower clamp group, so as to adapt to the no-ring spring 19 or / and the ring spring 20 with different lengths, and in the case that the size is unchanged, the no-ring spring 19 or / and the ring spring 20 with different strengths can be adjusted, so that the no-ring spring 19 or / and the ring spring 20 can be detected in the case of durability test under different forces.

[0052] As Figure 6 And Figure 11 It can be known that the c-shaped clamping seat 26 is installed on the bottom of the bracket 1, the c-shaped clamping seat 26 can be inserted on the desktop, then the desktop clamping piece 29 is driven by the adjusting clamping screw rod 27 to realize the clamping of the desktop, so that the bracket 1 can be fixed on the structure with a sheet-shaped plate body, and the functions of convenient disassembly and fixation can be realized.

[0053] The above is only a further embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the technical field can make equivalent replacement or change according to the technical scheme and concept of the present application within the scope disclosed by the present application, and all of them belong to the protection scope of the present application.

Claims

1. A spring fatigue resistant structure comprising two sets of clamp groups arranged opposite to each other, at least one set of clamp groups being periodically adjusted by a linkage group, characterized in that: The clamp group comprises a top cover (11) and a bottom cover (10), and the inside of the top cover (11) and the bottom cover (10) is provided with a driving group; At least two groups of limiting sliding grooves (15) are arranged on the top of the top cover (11), and an inner sliding block (36) driven and adjusted by the driving group is arranged in the limiting sliding groove (15); A no-loop spring placing seat (16) is arranged on the top of the inner sliding block (36), the top of the no-loop spring placing seat (16) is provided with a groove part, and the two ends of the top of the no-loop spring placing seat (16) are protruded; a first pressure sensor (17) is arranged in the groove part of the no-loop spring placing seat (16); and the first pressure sensor (17) receives a no-loop spring (19) placed in the groove part of the no-loop spring placing seat (16); A tension detection loop (33) is arranged on the top of the top cover (11), and a second pressure sensor is arranged in the tension detection loop (33); and the tension detection loop (33) is used for hanging a loop spring (20).

2. A spring fatigue-resistant structure according to claim 1, characterized in that: The connecting rod group adjusts the distance between the two groups of clamp groups through a distance adjusting group; A clamping seat group for clamping the support (1) on a plate-shaped structure is arranged on the bottom of the support (1).

3. A spring fatigue-resistant structure according to claim 2, characterized in that: The distance adjusting group comprises an auxiliary adjusting plate (4), a first limiting strip opening (5), an adjusting rod (3), an adjusting screw (13), a spring length adjusting motor (24), a T-shaped sliding limiting piece (25) and a back plate (9); The auxiliary adjusting plate (4) is mounted on the back top of the back plate (9), the first limiting strip opening (5) is axially arranged in the middle of the auxiliary adjusting plate (4), the T-shaped sliding limiting piece (25) is inserted into the first limiting strip opening (5) and slides in the first limiting strip opening (5), and the end of the T-shaped sliding limiting piece (25) is mounted with the adjusting rod (3); The spring length adjusting motor (24) is mounted on the top middle of the auxiliary adjusting plate (4), the output end of the spring length adjusting motor (24) is mounted with the adjusting screw (13) penetrating through the adjusting rod (3) and being in mesh with the adjusting rod (3), and the back middle of the adjusting rod (3) is fixed with the support (1).

4. A spring fatigue-resistant structure according to claim 3, characterized in that: The connecting rod group comprises a spring detection motor (23), a linkage turntable (6), a first hinged rod (7), a second hinged rod (8), a second limiting strip opening (18) and a work-shaped frame (21); The spring detection motor (23) is mounted on the front upper side of the back plate (9), and the output end of the spring detection motor (23) is mounted with the linkage turntable (6); The outer edge of the front of the linkage turntable (6) is hinged with the first hinged rod (7), the output end of the first hinged rod (7) is hinged with the second hinged rod (8), the second limiting strip opening (18) is axially arranged in the second hinged rod (8), the work-shaped frame (21) is inserted into the second limiting strip opening (18) to limit the movement of the second hinged rod (8), and the second hinged rod (8) is hinged with the bottom cover (10) above or below.

5. The spring fatigue-resistant structure of claim 1, wherein: An inner adjusting screw (35) is installed at the top middle of the top cover (11), and an outer adjusting cylinder (34) is engaged on the outer side of the inner adjusting screw (35). A tension detection hanging ring (33) is installed on the top of the outer adjusting cylinder (34). The outer adjusting cylinder (34) is rotated to adjust the spacing between the tension detection hanging ring (33) and the top cover (11) to adapt to the hanging ring spring (20).

6. The spring fatigue-resistant structure of claim 1, wherein: The driving group includes a motor frame (28), a desktop clamping piece (29), a driving bevel gear (30), a driven bevel gear (31) and a clamping distance adjustment screw (32); A motor frame (28) is installed in the middle of the inner bottom of the bottom cover (10), a desktop clamping piece (29) is installed in the middle of one side of the motor frame (28), and an active bevel gear (30) is installed at the output end of the desktop clamping piece (29), and a driven bevel gear (31) is meshed on the outside of the active bevel gear (30), and a clamping distance adjusting screw (32) is installed in the middle of the side of the driven bevel gear (31) and passes through the limiting slide groove (15), and the clamping distance adjusting screw (32) and the inner slider (36) are meshed with each other.

7. A spring fatigue-resistant structure according to claim 2, characterized in that: The clamping seat assembly includes a C-shaped clamping seat (26), a desktop clamping piece (29) and a clamping screw (27); A C-shaped clamping seat (26) is installed at the bottom of the bracket (1), and a clamping screw (27) is provided on the top of the C-shaped clamping seat (26) that penetrates the top of the C-shaped clamping seat (26) and engages with the C-shaped clamping seat (26). A desktop clamping piece (29) is installed at the bottom of the clamping screw (27), and the bottom of the bracket (1) is fixed to the top of the C-shaped clamping seat (26).

8. The spring fatigue-resistant structure of claim 1, wherein: The bottom cover (10) below fixes the bottom fixing plate (22), a connecting rod (2) is installed on the side of the bottom fixing plate (22), and the other end of the connecting rod (2) is fixed to the bottom side of the bracket (1).

9. The spring fatigue-resistant structure of claim 1, wherein: The top cover (11) is engaged with the adjusting screw (13) via the fixing bolt (14) to fix the top cover (11) and the bottom cover (10) together; The fixing bolt (14) is a polygonal structure, and a strip-shaped notch is provided on the top of the fixing bolt (14) for removal using a flat-blade screwdriver.

10. The spring fatigue-resistant structure of claim 1, wherein: The edge of the first pressure sensor (17) is electrically connected to a wire in the top cover (11), which is then inserted into the bottom cover (10) and led out for wiring.

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