Clamping tool for assembling brake handle

Abstract

The utility model discloses a clamping tool for assembling a brake handle, and relates to the technical field of brake handle machining. The supporting plates are fixed to the upper surface of the rotating disc at equal angles, and a mounting plate is arranged on one side of each supporting plate and arranged on the upper side of the rotating disc in a suspended mode. The fixing plates are vertically and symmetrically arranged on the two sides of one side of the supporting plate in pairs, a rectangular groove is formed in the side, adjacent to the center of the rotating disc, of one side wall of the supporting plate, a movable plate is arranged in the rectangular groove, and the movable plate is connected with the corresponding upper and lower fixing plates through a position adjusting mechanism; the driving mechanisms are arranged in the supporting plates in a one-to-one correspondence mode, and the driving rods are connected with the corresponding fixing plates. The abutting mechanisms are fixed to the side walls, adjacent to the center of the supporting plate, of the fixing plates in a one-to-one correspondence mode, and the abutting mechanisms on the two vertically-corresponding fixing plates are arranged in a matched mode. The special-shaped brake handle can be clamped in an abutting mode, in the assembling process, positioning is stable, and the phenomenon of violent shaking cannot happen.

Description

TECHNICAL FIELD

[0001] The utility model relates to brake handle processing technical field, concretely relates to a clamping tool for brake handle assembly. BACKGROUND

[0002] The electric vehicle brake handle is a brake component for braking on the electric vehicle, which mainly controls the handle rod on the electric vehicle brake handle by the operator, and the brake pad is pressed on the hub to brake after the brake cable is pulled. During the production process, various components on the brake handle need to be assembled. Specifically, the main component on the brake handle, i.e. the shell, is positioned before assembly, and then each remaining component is assembled one by one. The electric vehicle brake handle has a special shape, and the positioning of the components is difficult during assembly. Specifically, the components with special shapes are difficult to position, which leads to unstable positioning and severe shaking during the assembly process, making it difficult to tighten the screws and other components. SUMMARY

[0003] The utility model discloses to the defects and insufficient of prior art, provide a kind of design reasonable, convenient to use Clamping tool for brake handle assembly, can effectively solve the defects of above-mentioned prior art.

[0004] To achieve the above object, the utility model adopts the following technical scheme: it contains workbench, support leg, rotating disc and rotating motor, the four corners of the lower side wall of the workbench are all fixed with support leg, the upper side of the workbench is embedded with rotating disc, the lower side of the rotating disc is fixed with rotating motor, and the rotating motor is embedded and fixed in the lower side wall of the workbench;It also contains:

[0005] Support plate, the support plate is several, and it is fixed on the upper surface of the rotating disc at equal angles, one side of the support plate is provided with mounting plate, and the mounting plate is suspended on the upper side of the rotating disc;

[0006] Fixed plate, the fixed plate is several, and it is arranged on both sides of the one side of the mounting plate in pairs, one side of the side wall of the support plate adjacent to the center of the rotating disc is provided with rectangular groove, and the movable plate is arranged in the rectangular groove, and the movable plate is connected with the corresponding upper and lower two fixed plates through position adjusting mechanism;

[0007] Driving mechanism, the driving mechanism is several, and it is arranged in the mounting plate in pairs, and the driving rod is connected with the corresponding fixed plate;

[0008] Resisting mechanism, the resisting mechanism is several, and it is fixed on the side wall of the fixed plate adjacent to the center of the mounting plate in pairs, and the resisting mechanisms on the upper and lower corresponding two fixed plates are arranged in pairs.

[0009] By the technical scheme, the brake handle is installed between the two abutting mechanisms corresponding to the upper and lower sides, then the position of the movable plate is adjusted by the position adjusting mechanism according to the length of the brake handle, the two fixed plates on the movable plate are moved, so that the abutting mechanisms on the fixed plates are located on the upper and lower sides of the other end of the brake handle, at this time, the four fixed plates on one side of the mounting plate are moved to one side of the brake handle by the driving mechanism, so that the brake handle can be clamped, after clamping is completed, the brake handle can be assembled, and after assembly is completed, the rotating motor is started, the rotating motor drives the rotating disc to rotate, the rotating disc drives the mounting plate, the fixed plate and the brake handle clamped in the abutting mechanism to rotate through the supporting plate, and rotation to the next position is facilitated.

[0010] As a further improvement of the utility model, the position adjusting mechanism comprises:

[0011] The moving block is fixed on the inner wall of the movable plate and is slidably arranged in the sliding groove on the inner wall of the rectangular groove;

[0012] The abutting spring is two, and the two ends of the abutting spring are fixed on the side wall of the sliding groove on the inner wall of the rectangular groove and the side wall of the moving block, respectively, and the inside of the abutting spring is penetrated and provided with a guide rod, one end of the guide rod penetrates through the side wall of the mounting plate and is suspended on the outside of the mounting plate.

[0013] The connecting bent rod is arranged in a U shape, and the upper and lower ends of the connecting bent rod are fixedly connected with the outer ends of the upper and lower guide rods, respectively.

[0014] When the brake handle is installed, and the front side of the brake handle is placed in a proper position, the connecting bent rod is pulled, the connecting bent rod drives the moving block to move through the guide rod, at this time, the abutting spring is compressed, so that the protrusion at the outer end of the brake handle is located on the outside of the abutting mechanism on the movable plate, then the connecting bent rod is released, the elastic force of the abutting spring drives the moving block to move in the opposite direction, until the abutting mechanism on the movable plate is abutted on the protrusion on the brake handle after clamping.

[0015] As a further improvement of the utility model, the driving mechanism comprises:

[0016] The bidirectional screw rod is a plurality of, and the screw nuts at the upper and lower ends of the bidirectional screw rod are fixed on the fixed plates adjacent thereto one by one, respectively, the bidirectional screw rods are embedded and rotatably connected to the side wall of the mounting plate and the movable plate through bearings, and the lower end of the bidirectional screw rod in the movable plate is movably inserted into the strip-shaped groove on the lower inner wall of the mounting plate.

[0017] The worm gear is two, and the worm gears are sleeved and fixed on one end of the bidirectional screw rod on the lower side of the mounting plate, respectively, and the side of each worm gear is engaged with a worm.

[0018] The driving rod is rotatably connected in the mounting plate through a bearing, the worm movable sleeve on the lower side of the movable plate is arranged on the driving rod, the groove on the inner ring wall of the worm is movably sleeved on the driving strip on the outer ring wall of the driving rod, and another worm is sleeved and fixed on the driving rod;

[0019] The driving motor is embedded and fixed in one side of the mounting plate, and the output shaft of the driving motor is connected with one end of the driving rod;

[0020] Through the above technical scheme, the driving motor is started, the driving motor drives the driving rod to rotate, the driving rod drives the worms on both sides to rotate, the worms drive the corresponding worm gears to rotate, the worm gears drive the bidirectional screw rods to rotate, the bidirectional screw rods drive the fixed plates to move through the screw nuts at both ends, so that the abutting mechanism can be driven to move, and the worm on the lower side of the movable plate is movably clamped on the driving rod through the driving strip, so that the movement of the movable plate and the abutting mechanism on the movable plate is not affected.

[0021] As a further improvement of the utility model, the abutting mechanism comprises:

[0022] The fixed blocks are two and are fixed on the upper surfaces of the fixed plates, and the two sides of the fixed blocks are rotatably connected with the mounting racks through shaft rods;

[0023] The abutting rollers are two and are arranged on the two sides of the fixed blocks, and the abutting rollers are rotatably connected with the two sides of the mounting racks through shaft rods;

[0024] The support rods are two and are arranged on one side of the abutting rollers, and the two ends of the support rods are fixedly connected with the side walls of the mounting racks on the two sides;

[0025] Through the above technical scheme, the fixed plate drives the fixed blocks to move until the abutting rollers abut on the brake handle, when the brake handle is profiled, the abutting roller that has abutted on the brake handle drives the mounting rack to rotate around the shaft rod on the fixed block, the mounting rack drives the other abutting roller to rotate, until the other abutting roller abuts on the brake handle, so that the clamping effect is achieved.

[0026] As a further improvement of the utility model, the inside of the support plate is embedded with a rotating motor, and the output shaft of the rotating motor is connected with the mounting plate;

[0027] Through the above technical scheme, when in use, according to the angle required when the brake handle is installed, the rotating motor is started, and the rotating motor drives the mounting plate to rotate.

[0028] As a further improvement of the utility model, one side of the mounting plate is provided with a fixing frame, the fixing frame is arranged in an "L" shape, the horizontal plate of the fixing frame is movably inserted into the lower side wall of the mounting plate and slides through the sliding block, an equal number of tension springs are inserted into and fixed in the horizontal plate of the fixing frame, the tension springs are fixed on the inner wall of the mounting plate, and the abutting mechanism is fixed on the side wall of the vertical plate of the fixing frame adjacent to the mounting plate.

[0029] Through the above technical scheme, after the fixing plate is moved away from the mounting plate, the brake handle is installed on the mounting plate, then the fixing frame is loosened, the tension spring drives the fixing frame to move to one side of the mounting plate, and the abutting mechanism on the fixing frame abuts against the side wall of the brake handle.

[0030] Compared with the prior art, the utility model has the advantages that the clamping tool for brake handle assembly can abut and clamp the special-shaped brake handle, is stable in positioning and does not shake violently during assembly, and has the advantages of reasonable arrangement and low manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structural schematic view of the utility model.

[0032] Figure 2 It is an exploded view of the utility model.

[0033] Figure 3 It is an exploded view of the support plate, the mounting plate, the position adjusting mechanism, the driving mechanism and the abutting mechanism in the utility model.

[0034] Figure 4 It is an exploded view of the driving mechanism in the utility model.

[0035] Figure 5 It is an exploded view of the abutting mechanism in the utility model.

[0036] Figure 6 It is an exploded view of the fixing frame and the tension spring in the utility model.

[0037] BRIEF DESCRIPTION OF DRAWINGS

[0038] Workbench 1, support leg 2, rotating disc 3, rotary motor 4, support plate 5, mounting plate 6, rectangular groove 6-1, fixing plate 7, movable plate 8, position adjusting mechanism 9, moving block 9-1, abutting spring 9-2, guide rod 9-3, connecting bent rod 9-4, driving mechanism 10, bidirectional screw rod 10-1, worm wheel 10-2, worm 10-3, driving rod 10-4, driving motor 10-5, abutting mechanism 11, fixing block 11-1, mounting frame 11-2, abutting roller 11-3, support rod 11-4, rotating motor 12, fixing frame 13, tension spring 14. DETAILED DESCRIPTION

[0039] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0040] Example 1: As Figures 1-6 As shown, this embodiment includes a worktable 1, support legs 2, a rotating disk 3, and a rotary motor 4. Support legs 2 are welded and fixed to the four corners of the lower sidewall of the worktable 1. The rotating disk 3 is embedded in the upper side of the worktable 1, and the rotary motor 4 is fixed to the lower side of the rotating disk 3. The rotary motor 4 is embedded in and fixed to the lower sidewall of the worktable 1 with bolts. It also includes:

[0041] Support plates 5, of which there are several, are welded and fixed at equal angles to the upper surface of the rotating disk 3. A mounting plate 6 is provided on one side of the support plate 5 and is suspended above the rotating disk 3. A rotating motor 12 is embedded inside the support plate 5. The output shaft of the rotating motor 12 is connected to the mounting plate 6. When in use, the rotating motor 12 can be started according to the angle required for the installation of the brake lever, and the rotating motor 12 drives the mounting plate 6 to rotate.

[0042] Fixed plates 7, there are several fixed plates 7, and they are symmetrically arranged on both sides of one side of the mounting plate 6. A rectangular groove 6-1 is opened on one side wall of the mounting plate 6 adjacent to the center of the rotating disk 3. A movable plate 8 is arranged in the rectangular groove 6-1. The movable plate 8 is connected to the corresponding upper and lower fixed plates 7 through the position adjustment mechanism 9.

[0043] The drive mechanism 10 consists of several units, each corresponding to one of the mounting plates 6. The drive rod 10-4 is connected to the corresponding fixing plate 7.

[0044] The abutment mechanism 11 consists of several parts, each fixed to a side wall of the fixing plate 7 adjacent to the center of the mounting plate 6. The abutment mechanisms 11 on two corresponding upper and lower fixing plates 7 are arranged in cooperation. A fixing frame 13 is provided on one side of the mounting plate 6. The fixing frame 13 is arranged in an "L" shape. The horizontal plate of the fixing frame 13 is movably inserted and slides in the lower side wall of the mounting plate 6 via a slider. Tension springs 14 are equidistantly inserted and fixed inside the horizontal plate of the fixing frame 13. The tension springs 14 are fixed to the inner wall of the mounting plate 6. The abutment mechanism 11 is fixed on the side wall of the vertical plate of the fixing frame 13 adjacent to the mounting plate 6. After moving the fixing plate 7 away from the mounting plate 6, the brake lever is installed on the mounting plate 6. Then the fixing frame 13 is released, and the tension spring 14 drives the fixing frame 13 to move to one side of the mounting plate 6 until the abutment mechanism 11 on the fixing frame 13 abuts against the side wall of the brake lever.

[0045] Embodiment 2: Referring to Figures 2-3 As shown in the drawings, on the basis of Embodiment 1, the position adjusting mechanism 9 comprises:

[0046] a moving block 9-1, which is welded and fixed on the inner wall of the movable plate 8, and is slidingly arranged in the sliding groove inside the rectangular groove 6-1;

[0047] a contact spring 9-2, which is two in number, and whose two ends are respectively welded and fixed on the side wall of the sliding groove of the inner wall of the rectangular groove 6-1 and on the side wall of the moving block 9-1, and a guide rod 9-3 is inserted through the inside of the contact spring 9-2, and one end of the guide rod 9-3 is arranged outside the mounting plate 6 after penetrating through the side wall of the mounting plate 6;

[0048] a connecting bent rod 9-4, which is arranged in a "U" shape, and whose upper and lower ends are respectively welded and fixed with the outer ends of the upper and lower guide rods 9-3.

[0049] Embodiment 3: Referring to Figures 3-4 As shown in the drawings, on the basis of Embodiment 1, the driving mechanism 10 comprises:

[0050] a bidirectional screw rod 10-1, which is a plurality of in number, and whose upper and lower screw nuts are respectively welded and fixed on the adjacent fixed plates 7 one by one, and the bidirectional screw rod 10-1 is respectively embedded and rotatably connected with the bearing in the side wall of the mounting plate 6 and in the movable plate 8, and the lower end of the bidirectional screw rod 10-1 in the movable plate 8 is movably inserted in the strip-shaped groove on the lower inner wall of the mounting plate 6;

[0051] a worm gear 10-2, which is two in number, and which is respectively sleeved and welded and fixed on one end of the bidirectional screw rod 10-1 on the lower side of the mounting plate 6, and one side of the worm gear 10-2 is engaged with a worm 10-3;

[0052] a driving rod 10-4, which is rotatably connected with the bearing in the mounting plate 6, and the worm 10-3 on the lower side of the movable plate 8 is movably sleeved on the driving rod 10-4, and the recess on the inner ring wall of the worm 10-3 is movably sleeved on the driving bar on the outer ring wall of the driving rod 10-4, and the other worm 10-3 is sleeved and welded and fixed on the driving rod 10-4;

[0053] a driving motor 10-5, which is embedded and fixed in one side of the mounting plate 6, and the output shaft of the driving motor 10-5 is connected with one end of the driving rod 10-4.

[0054] Embodiment 4: Referring to Figure 2 , Figure 5As shown, on the basis of embodiment 1, the interference mechanism 11 comprises:

[0055] The fixed blocks 11-1 are two and are fixed on the upper surface of the fixed plate 7, and the two sides of the fixed blocks 11-1 are rotatably connected with the mounting racks 11-2 through shafts;

[0056] The interference rollers 11-3 are two and are arranged on the two sides of the fixed blocks 11-1, and the interference rollers 11-3 are rotatably connected with the two sides of the mounting racks 11-2 through shafts;

[0057] The support rods 11-4 are two and are arranged on one side of the interference rollers 11-3, and the two ends of the support rods 11-4 are fixedly connected with the side walls of the two mounting racks 11-2.

[0058] In use, the brake handle is installed between the two interference mechanisms 11 corresponding to the upper and lower sides, and when the brake handle is installed, the front side of the brake handle is placed at a proper position, the connecting bent rod 9-4 is pulled, the connecting bent rod 9-4 drives the moving block 9-1 to move through the guide rod 9-3, at this time, the interference spring 9-2 is compressed, so that the protrusion at the outer end of the brake handle is located outside the interference mechanism 11 on the movable plate 8, and then the connecting bent rod 9-4 is released, the elastic force of the interference spring 9-2 drives the moving block 9-1 to move in the opposite direction, until the interference mechanism 11 on the movable plate 8 is clamped and interferes with the protrusion on the brake handle, the driving motor 10-5 is started, the driving motor 10-5 drives the driving rod 10-4 to rotate, the driving rod 10-4 drives the two side worm gears 10-3 to rotate, the worm gears 10-3 drive the corresponding worm wheels 10-2 to rotate, the worm wheels 10-2 drive the bidirectional screw rod 10-1 to rotate, the bidirectional screw rod 10-1 drives the fixed plate 7 to move through the two end nuts, so that the interference mechanism 11 can be driven to move, and the worm gear 10-3 on the lower side of the movable plate 8 is clamped on the driving rod 10-4 through the driving strip, so that the movement of the movable plate 8 and the interference mechanism 11 on the movable plate 8 is not affected, until the interference roller 11-3 interferes with the brake handle, when the brake handle is of a special shape, the interference roller 11-3 that interferes with the brake handle drives the mounting rack 11-2 to rotate around the shaft on the fixed block 11-1 as the rotation center, the mounting rack 11-2 drives the other interference roller 11-3 to rotate, until the other interference roller 11-3 interferes with the brake handle, so that the clamping effect is achieved, after the clamping is completed, the brake handle can be assembled, after the assembly is completed, the rotating motor 4 is started, the rotating motor 4 drives the rotating disc 3 to rotate, the rotating disc 3 drives the mounting plate 6, the fixed plate 7 and the brake handle clamped in the interference mechanism 11 to rotate through the support plate 5, so as to facilitate rotation to the next position.

[0059] Compared with the prior art, the specific embodiment has the following beneficial effects:

[0060] 1、Through four matched abutting mechanisms 11, four parts of the brake handle can be abutted and clamped, and the abutting roller 11-3 in the abutting mechanism 11 can rotate on the fixed block 11-1, so as to be suitable for clamping the brake handle of special shape, and the stability during clamping is improved;

[0061] 2、The two abutting mechanisms 11 adjacent to one side of the center of the rotating disc 3 can be adjusted through the position adjusting mechanism 9, so as to be suitable for clamping brake handles of different lengths;

[0062] 3、The upper and lower positions of the abutting mechanism 11 can be driven through the driving mechanism 10, and the abutting mechanisms 11 on the same mounting plate 6 can be driven synchronously, and the position adjusting mechanism 9 can adjust the positions thereof;

[0063] 4、The fixed frame 13 is arranged on one side of the mounting plate 6, and the abutting mechanism 11 is arranged on the fixed frame 13, so that the side edge of the brake handle can be limited, and the sliding phenomenon of the brake handle is avoided.

[0064] For those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, and equivalent replacement of part of the technical features can be made, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A clamping tool for brake handle assembly, comprising a workbench (1), support legs (2), a rotating disc (3) and a rotating motor (4), the four corners of the lower side wall of the workbench (1) are fixed with support legs (2), the upper side of the workbench (1) is embedded with the rotating disc (3), the lower side of the rotating disc (3) is fixed with the rotating motor (4), and the rotating motor (4) is embedded and fixed in the lower side wall of the workbench (1); characterized in that: It also contains: ​ Support plate (5), the support plate (5) is several, and its angle is fixed on the upper surface of the rotating disc (3), one side of the support plate (5) is provided with a mounting plate (6), the mounting plate (6) is suspended on the upper side of the rotating disc (3); Fixed plate (7), the fixed plate (7) is several, and its two two upper and lower symmetrically arranged on both sides of the mounting plate (6) one side, the mounting plate (6) one side wall adjacent to the center of the rotating disc (3) one side is provided with a rectangular groove (6-1), the rectangular groove (6-1) is provided with a movable plate (8), the movable plate (8) is connected with the corresponding upper and lower two fixed plate (7) through the position adjusting mechanism (9); Driving mechanism (10), the driving mechanism (10) is several, and it is one by one corresponding to be arranged in the mounting plate (6), the driving rod (10-4) is connected with the corresponding fixed plate (7); Resisting mechanism (11), the resisting mechanism (11) is several, and it is one by one corresponding to be fixed on the side wall of the fixed plate (7) adjacent to the center of the mounting plate (6), the resisting mechanism (11) on the upper and lower corresponding two fixed plate (7) is matched.

2. A clamping tool for brake lever assembly according to claim 1, wherein: The position adjusting mechanism (9) contains: Moving block (9-1), the moving block (9-1) is fixed on the inner wall of the movable plate (8), the moving block (9-1) is slidably arranged in the sliding groove on the inner wall of the rectangular groove (6-1); Resisting spring (9-2), the resisting spring (9-2) is two, and its two ends are respectively fixed on one side wall of the sliding groove of the inner wall of the rectangular groove (6-1) and one side wall above the moving block (9-1), the inside of the resisting spring (9-2) is inserted with a guide rod (9-3), one end of the guide rod (9-3) passes through one side wall of the mounting plate (6) and is suspended on the outside of the mounting plate (6); Connecting bent rod (9-4), the connecting bent rod (9-4) is arranged in "U" shape, the upper and lower ends of the connecting bent rod (9-4) are respectively fixedly connected with the outer ends of the upper and lower two guide rods (9-3).

3. A clamping tool for brake lever assembly as claimed in claim 1 wherein: The driving mechanism (10) contains: Bidirectional screw rod (10-1), the bidirectional screw rod (10-1) is several, and the screw nut at both ends of the bidirectional screw rod (10-1) is respectively one by one fixed on the fixed plate (7) adjacent thereto, the bidirectional screw rod (10-1) is respectively embedded and rotatably connected with the bearing on one side wall of the mounting plate (6) and in the movable plate (8), the lower end of the bidirectional screw rod (10-1) in the movable plate (8) is movably inserted in the strip groove on the lower inner wall of the mounting plate (6); Worm wheel (10-2), the worm wheel (10-2) is two, and it is respectively sleeved and fixed on one end of the bidirectional screw rod (10-1) on the lower side of the mounting plate (6), one side of the worm wheel (10-2) is engaged with a worm (10-3); The driving rod (10-4) is screwed in the mounting plate (6) through a bearing, the worm (10-3) on the lower side of the movable plate (8) is movably sleeved on the driving rod (10-4), and the groove on the inner ring wall of the worm (10-3) is movably sleeved on the driving bar on the outer ring wall of the driving rod (10-4), and the other worm (10-3) is sleeved and fixed on the driving rod (10-4); The driving motor (10-5) is embedded and fixed in one side of the mounting plate (6), and the output shaft of the driving motor (10-5) is connected with one end of the driving rod (10-4).

4. The clamping tool for brake lever assembly according to claim 1, wherein: The abutting mechanism (11) comprises: The fixed block (11-1) is two, and is fixed on the upper surface of the fixed plate (7) on both sides, and the two sides of the fixed block (11-1) are provided with mounting racks (11-2) through shafts; The abutting roller (11-3) is two, and is arranged on the two sides of the fixed block (11-1), and the abutting roller (11-3) is rotatably connected with the two sides of the mounting rack (11-2) through a shaft; The supporting rod (11-4) is two, and is arranged on one side of the abutting roller (11-3), and the two ends of the supporting rod (11-4) are fixedly connected with the side walls of the two mounting racks (11-2) respectively.

5. The clamping tool for brake lever assembly according to claim 1, wherein: The inside of the supporting plate (5) is embedded with a rotating motor (12), and the output shaft of the rotating motor (12) is connected with the mounting plate (6).

6. A clamping tool for brake lever assembly as claimed in claim 1 wherein: One side of the mounting plate (6) is provided with a fixed frame (13), the fixed frame (13) is arranged in "L" shape, the horizontal plate of the fixed frame (13) is movably inserted and slid in the lower side wall of the mounting plate (6) through a sliding block, the inside of the horizontal plate of the fixed frame (13) is equidistantly inserted and fixed with a tension spring (14), the tension spring (14) is fixed on the inner wall of the mounting plate (6), and the abutting mechanism (11) is fixed on the vertical plate of the fixed frame (13) adjacent to one side wall of the mounting plate (6).

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