CN114734220A

CN114734220A - Assembling equipment for bolt and nut

Info

Publication number: CN114734220A
Application number: CN202210454387.2A
Authority: CN
Inventors: 程俊文
Original assignee: Individual
Current assignee: Guangdong Shunfa Electric Power Equipment Co ltd
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2022-07-12
Anticipated expiration: 2042-04-27
Also published as: CN114734220B

Abstract

The invention discloses assembling equipment for bolts and nuts, and belongs to the technical field of bolt assembly. An assembling device for bolt and nuts comprises a first placing frame and a second placing frame, wherein a connecting shell is arranged between the first placing frame and the second placing frame, uniformly distributed bolt main bodies are arranged in the first placing frame, uniformly distributed nut main bodies are arranged in the second placing frame, the bottom of the first placing frame is connected with a base through a connecting rod, a first conveying assembly for conveying the bolt main bodies to move is arranged on the first placing frame, a second conveying assembly for conveying the nut main bodies to move is arranged on the second placing frame, and the second conveying assembly is connected with an assembling assembly; according to the invention, the bolt and the nut are automatically assembled without manual assembly, the production safety and the production efficiency are higher, and the assembled assembly is orderly stored, so that the space utilization rate is improved, the replacement times of a collecting box by workers are reduced, and the workload of the workers is further reduced.

Description

Assembling equipment for bolt and nut

Technical Field

The invention relates to the technical field of bolt assembly, in particular to assembling equipment for bolts and nuts.

Background

The bolt is a cylindrical threaded fastener with a nut, and consists of a head part and a screw rod, the bolt is usually used for fastening and connecting two parts with through holes, in the industrial field, the bolt is an indispensable fastener, the use scene is wide, so that the use quantity of the bolt is huge, and when the bolt is sold by manufacturers, the nut is generally screwed on the bolt.

When the nut is rotated on the bolt, at present, manpower is mostly utilized, the labor intensity is high for operators, the operators are easy to fatigue, and the sharp outer edge of the thread on the bolt is easy to injure the operators, so that the life safety of the operators is seriously harmed; meanwhile, the bolt and the nut are randomly placed in the collecting box after being assembled, so that the space utilization rate of the collecting box is low, the collecting box is quickly filled, the collecting box needs to be frequently replaced by workers, efficient continuous production cannot be realized, and the production efficiency of a factory is greatly limited.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides assembling equipment for bolts and nuts.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an rigging equipment for bolt and nut, includes first rack and second rack, be provided with between first rack and the second rack and connect the casing, be provided with evenly distributed's bolt main part in the first rack, be provided with evenly distributed's nut main part in the second rack, the bottom of first rack is connected with the base through the connecting rod, be provided with the first transport assembly who is used for carrying the bolt main part to remove on the first rack, be provided with the second transport assembly who is used for carrying the nut main part to remove on the second rack, the second transport assembly is connected with the assembly subassembly, be provided with on the base and collect change mechanism, it arranges the end of first transport assembly and second transport assembly in to collect change mechanism.

Preferably, the first conveying assembly comprises a first elastic telescopic rod fixedly arranged on the inner wall of the connecting shell, the telescopic end of the first elastic telescopic rod is connected with a first push plate, an arc-shaped plate is connected onto the first push plate, the bolt main body comprises an end part and a rod part, the first push plate is movably abutted against the end part, and the arc-shaped plate is movably abutted against the rod part.

Preferably, the second conveying assembly comprises a supporting plate fixedly arranged on the connecting shell, a driving motor is fixedly arranged on the supporting plate, the output end of the driving motor is connected with a driving shaft, a half gear is arranged on the driving shaft, the second conveying assembly further comprises two connecting plates fixedly arranged on the second placing frame, the two connecting plates are respectively rotatably connected with a connecting rod, one of the connecting rods is provided with a large gear meshed with the half gear, each connecting rod is provided with a first synchronizing wheel, a first belt is arranged between the two first synchronizing wheels, the first belt is provided with a first shifting plate, and the first shifting plate penetrates through the second placing frame and movably abuts against the nut main body.

Preferably, the assembly subassembly is including rotating screw rod and the dwang of connection on the base, the cover is equipped with the clockwork spring on the screw rod, the clockwork spring sets up in the base, be provided with the pinion of being connected with half gear engagement on the screw rod, all be provided with the second synchronizing wheel on screw rod and the dwang, two be provided with the second belt between the second synchronizing wheel, threaded connection has the movable plate on the screw rod, rotate through the bearing on the movable plate and be connected with the sleeve pipe, sleeve pipe sliding connection is on the dwang, sheathed tube top is connected with the roof, the roof offsets with bolt main part activity.

Preferably, the rotating rod is provided with a guide strip, and the inner wall of the sleeve is provided with a guide groove matched with the guide strip.

Preferably, a movable groove is formed in the inner wall of the first placing frame, a movable plate is connected to the inner wall of the movable groove in a sliding mode, a first elastic element is arranged between the movable plate and the inner wall of the movable groove, and the bolt body is movably abutted to the movable plate.

Preferably, the two connecting rods are provided with third synchronizing wheels, a third belt is arranged between the two third synchronizing wheels, the third belt is provided with second shifting plates which are uniformly distributed, and the second shifting plates penetrate through the connecting shell and movably abut against the end parts.

Preferably, the collecting and replacing mechanism comprises a slide way fixedly arranged on the base, the slide way is provided with uniformly distributed collecting boxes, and the collecting and replacing mechanism further comprises a driving assembly used for driving the collecting boxes to move and a positioning assembly used for limiting the collecting boxes.

Preferably, the driving assembly comprises a first connecting plate fixedly arranged on the base, a second elastic telescopic rod is arranged on the first connecting plate, one end, far away from the first connecting plate, of the second elastic telescopic rod is connected with a second push plate, and the second push plate is movably abutted to the collecting box.

Preferably, the positioning assembly comprises a second connecting plate fixedly arranged on the base, a positioning block is arranged on the second connecting plate, a groove is formed in the positioning block, a positioning rod is connected in the groove in a sliding mode, a second elastic element is arranged between the positioning rod and the inner wall of the groove, a positioning hole matched with the positioning rod is formed in the collecting box, a stress plate is further connected in the collecting box in a sliding mode and is movably abutted to the bolt main body, and an ejector rod is arranged on the stress plate and movably abutted to the positioning rod.

Compared with the prior art, the invention provides assembling equipment for the bolt and the nut, which has the following beneficial effects:

1. this an rigging equipment for bolt nut assembles bolt and nut through automatic, need not the manual work and assembles, and production security is higher with production efficiency, and the assembly after the assembly is deposited in order, has improved the space utilization of collecting box, reduces the workman to the change number of times of collecting box, and then reduces staff's work load.

2. This an rigging equipment for bolt and nut dials the board through the second on the third belt and dials the board simultaneously and promote nut and bolt to carry with first on the belt, and then makes the assembly body after bolt and the nut assembly can steadily get into in the collecting box.

3. This an rigging equipment for bolt and nut, after the collection space in the collecting box used, the atress board removed to the inside of collecting box and made the ejector pin ejecting with the locating lever in the locating hole, made the collecting box remove under second elasticity telescopic link's elasticity, made the collecting box of rear side fix a position by the locating lever again to carry out automatic the change to the collecting box, reduce staff's work load, improved the overall efficiency of bolt and nut assembly simultaneously.

Drawings

FIG. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is a second structural diagram of the present invention;

FIG. 3 is an enlarged view of a portion A of FIG. 2 according to the present invention;

FIG. 4 is an enlarged view of the portion B of FIG. 2 according to the present invention;

FIG. 5 is a first cross-sectional view of the present invention;

FIG. 6 is a schematic cross-sectional view of the present invention;

fig. 7 is a schematic cross-sectional view of a second rack according to the present invention;

fig. 8 is a schematic cross-sectional view of the first rack of the present invention.

In the figure: 1. a bolt body; 101. an end piece; 102. a rod member; 2. a first placing rack; 3. a nut body; 4. a second rack; 5. connecting the shell; 6. a base; 7. a first elastic telescopic rod; 701. a first push plate; 702. an arc-shaped plate; 8. a support plate; 9. a drive motor; 901. a drive shaft; 902. a half gear; 10. a connecting plate; 11. a connecting rod; 111. a bull gear; 112. a first synchronizing wheel; 113. a first belt; 1131. a first dial plate; 12. a screw; 121. a pinion gear; 122. moving the plate; 123. a sleeve; 124. a top plate; 13. rotating the rod; 131. a guide strip; 14. a second synchronizing wheel; 141. a second belt; 15. a movable groove; 151. a movable plate; 152. a first elastic element; 16. a third synchronizing wheel; 161. a third belt; 1611. a second dial plate; 17. a slideway; 18. a collection box; 181. positioning holes; 182. a stress plate; 1821. a top rod; 19. a first connecting plate; 191. a second elastic telescopic rod; 192. a second push plate; 20. a second connecting plate; 21. positioning a block; 211. a groove; 212. positioning a rod; 213. a second elastic element.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

referring to fig. 1, fig. 2, fig. 5, fig. 6, fig. 7 and fig. 8, an assembling device for bolt and nut includes a first rack 2 and a second rack 4, a connecting shell 5 is arranged between the first rack 2 and the second rack 4, bolt main bodies 1 which are uniformly distributed are arranged in the first rack 2, nut main bodies 3 which are uniformly distributed are arranged in the second rack 4, the bottom of the first rack 2 is connected with a base 6 through a connecting rod, a first conveying assembly which is used for conveying the bolt main bodies 1 to move is arranged on the first rack 2, a second conveying assembly which is used for conveying the nut main bodies 3 to move is arranged on the second rack 4, the second conveying assembly is connected with an assembling assembly, a collecting and replacing mechanism is arranged on the base 6, and the collecting and replacing mechanism is arranged at the tail ends of the first conveying assembly and the second conveying assembly.

Specifically, the connecting shell 5 is opened by a worker, the bolt main body 1 and the nut main body 3 are respectively placed in the first placing frame 2 and the second placing frame 4, the bolt and the nut are conveyed through the first conveying assembly and the second conveying assembly, then the bolt and the nut are automatically assembled in pairs through the assembling assembly, and the assembled bolt and nut are orderly stored by the collecting and replacing mechanism.

Referring to fig. 5 and 6, as a preferred technical solution of the present invention, the first conveying assembly includes a first elastic telescopic rod 7 fixedly disposed on an inner wall of the connecting housing 5, a first push plate 701 is connected to a telescopic end of the first elastic telescopic rod 7, an arc-shaped plate 702 is connected to the first push plate 701, the bolt body 1 includes an end part 101 and a rod member 102, the first push plate 701 movably abuts against the end part 101, and the arc-shaped plate 702 movably abuts against the rod member 102; specifically, after the assembled bolts enter the collecting device, the first elastic telescopic rod 7 drives the first push plate 701 and the arc-shaped plate 702 to respectively push the upper part and the lower part of the bolts to the assembling position, so that the bolts are stably conveyed.

Referring to fig. 2, 3, 4, 5 and 6, as a preferred technical solution of the present invention, the second conveying assembly includes a supporting plate 8 fixedly disposed on the connecting housing 5, a driving motor 9 is fixedly disposed on the supporting plate 8, an output end of the driving motor 9 is connected with a driving shaft 901, a half gear 902 is disposed on the driving shaft 901, the second conveying assembly further includes two connecting plates 10 fixedly disposed on the second rack 4, the two connecting plates 10 are rotatably connected with connecting rods 11, one of the connecting rods 11 is provided with a large gear 111 engaged with the half gear 902, each connecting rod 11 is provided with a first synchronizing wheel 112, a first belt 113 is disposed between the two first synchronizing wheels 112, the first belt 113 is provided with a first shifting plate 1131, and the first shifting plate 1131 passes through the second rack 4 and movably abuts against the nut body 3.

Further, the assembly subassembly is including rotating screw rod 12 and the dwang 13 of connecting on base 6, the cover is equipped with the clockwork spring on the screw rod 12, the clockwork spring sets up in base 6, be provided with on the screw rod 12 with the pinion 121 that half gear 902 meshing is connected, all be provided with second synchronizing wheel 14 on screw rod 12 and the dwang 13, be provided with second belt 141 between two second synchronizing wheels 14, threaded connection has movable plate 122 on the screw rod 12, be connected with sleeve pipe 123 through the bearing rotation on the movable plate 122, sleeve pipe 123 sliding connection is on the dwang 13, the top of sleeve pipe 123 is connected with roof 124, roof 124 offsets with bolt body 1 activity.

Further, a guide strip 131 is arranged on the rotating rod 13, and a guide groove matched with the guide strip 131 is formed in the inner wall of the sleeve 123.

Specifically, when the driving motor 9 works, the output end of the driving motor 9 drives the half gear 902 on the driving shaft 901 to rotate, the half gear 902 is engaged with the large gear 111 on the connecting rod 11, so that the large gear 111 drives the connecting rod 11 to rotate, the two connecting rods 11 synchronously rotate under the action of the first synchronizing wheel 112, so that the first belt 113 drives, the first shifting plate 1131 is driven by the first belt 113 in the transmission process, so that the first shifting plate 1131 pushes the nut to enter the assembling position, when the large gear 111 is engaged with the half gear 902, the half gear 902 is not engaged with the small gear 121, after the large gear 111 is engaged with the half gear 902, the nut enters the assembling position, the small gear 121 starts to be engaged with the half gear 902, and the small gear 121 drives the screw 12 to rotate, the moving plate 122 screwed on the outer side moves upwards when the screw 12 rotates, and drives the sleeve 123 and the top plate 124 to move in the moving process, so that the top plate 124 pushes the bolt body 1 in the assembling position, the rotating rod 13 synchronously rotates with the screw 12 under the action of the second synchronizing wheel 14 and the second belt 141, and when the rotating rod 13 rotates, the guide strip 131 drives the sleeve 123 moving upwards to rotate, so that the sleeve 123 drives the bolt body 1 to rotate through the top plate 124, when the nut body 3 is fixed and can not rotate, the bolt body 1 moving upwards rotates under the condition that the top part is abutted against the nut and the bottom part is abutted against the top plate 124, the assembly with the nut body 3 is automatically completed, along with the continuous operation of the driving motor 9, the half gear 902 starts to be meshed with the large gear 111, the first shifting plate 1131 on the first belt 113 drives the assembly body to enter the collecting device and simultaneously conveys a new nut to enter the assembly position, while the half-gear 902 does not engage the pinion 121 at this time, causing the screw 12 to reset under the torsion of the spring, causing the top plate 124 to move down to await the next assembly of the bolt and nut.

Referring to fig. 5, 6 and 8, as a preferred technical solution of the present invention, a movable groove 15 is formed on an inner wall of the first rack 2, a movable plate 151 is slidably connected to an inner wall of the movable groove 15, a first elastic element 152 is disposed between the movable plate 151 and the inner wall of the movable groove 15, and the bolt body 1 is movably abutted against the movable plate 151; specifically, the movable plate 151 is disposed such that the bolt body 1 can be smoothly assembled under the transportation of the first transportation assembly, and when the bolt body 1 rotates along with the top plate 124, the bolt body 1 presses the movable plate 151, so that the bolt body 1 can have an excessive space for rotational movement.

Referring to fig. 1, 2 and 5, as a preferred technical solution of the present invention, third synchronizing wheels 16 are disposed on both the two connecting rods 11, a third belt 161 is disposed between the two third synchronizing wheels 16, second shifting plates 1611 are disposed on the third belt 161 and uniformly distributed, and the second shifting plates 1611 penetrate through the connecting shell 5 and movably abut against the end member 101; specifically, when the first belt 113 is used for transmission, the third belt 161 is used for synchronous transmission, the nuts and the bolts are simultaneously pushed and conveyed through the second shifting plate 1611 on the third belt 161 and the first shifting plate 1131 on the first belt 113, and then an assembly body formed by assembling the bolts and the nuts can stably enter the collecting device.

Referring to fig. 2, 3, 4, 5 and 6, as a preferred technical solution of the present invention, the collecting and replacing mechanism includes a slideway 17 fixed on the base 6, the slideway 17 is provided with collecting boxes 18 uniformly distributed, the collecting and replacing mechanism further includes a driving assembly for driving the collecting boxes 18 to move and a positioning assembly for limiting the position of the collecting boxes 18.

Furthermore, the driving assembly comprises a first connecting plate 19 fixedly arranged on the base 6, a second elastic telescopic rod 191 is arranged on the first connecting plate 19, one end, far away from the first connecting plate 19, of the second elastic telescopic rod 191 is connected with a second push plate 192, and the second push plate 192 movably abuts against the collecting box 18.

Further, the positioning assembly comprises a second connecting plate 20 fixedly arranged on the base 6, a positioning block 21 is arranged on the second connecting plate 20, a groove 211 is formed in the positioning block 21, a positioning rod 212 is slidably connected in the groove 211, a second elastic element 213 is arranged between the inner wall of the positioning rod 212 and the inner wall of the groove 211, a positioning hole 181 matched with the positioning rod 212 is formed in the collecting box 18, a stress plate 182 is further slidably connected in the collecting box 18, the stress plate 182 is movably abutted to the bolt body 1, a push rod 1821 is arranged on the stress plate 182, and the push rod 1821 is movably abutted to the positioning rod 212.

Specifically, the assembled nuts and bolts orderly enter the collection box 18, the assembly body entering the collection box 18 abuts against the stress plate 182, so that the stress plate 182 moves towards the interior of the collection box 18, after the collection of the collection box 18 is completed, the push rods 1821 on the stress plate 182 push out the positioning rods 212 in the positioning holes 181, so that the positioning rods 212 contract to enter the positioning blocks 21, at this time, the collection box 18 is no longer limited, the collection box 18 is pushed to move under the action of the second elastic expansion rods 191, when the collection box 18 at the second position moves to the collection box 18 at the original first position, the positioning rods 212 rapidly pop out under the elastic action of the second elastic elements 213 and enter the positioning holes 181, so that the collection box 18 is limited, so that the collection box 18 orderly collects and arranges the assembly bodies of the bolts and nuts, the space utilization rate of the collection box 18 on the assembly body is effectively improved, and the number of times for replacing the collection box 18 is reduced, meanwhile, the collecting box 18 is automatically replaced, the workload of workers is reduced, and the overall efficiency of bolt and nut assembly is improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims

1. An assembling device for bolt and nut comprises a first placing rack (2) and a second placing rack (4), wherein a connecting shell (5) is arranged between the first placing rack (2) and the second placing rack (4), and is characterized in that bolt main bodies (1) are uniformly distributed in the first placing rack (2), nut main bodies (3) are uniformly distributed in the second placing rack (4), the bottom of the first placing rack (2) is connected with a base (6) through a connecting rod, a first conveying assembly for conveying the bolt main bodies (1) to move is arranged on the first placing rack (2), a second conveying assembly for conveying the nut main bodies (3) to move is arranged on the second placing rack (4), the second conveying assembly is connected with an assembling assembly, and a collecting and replacing mechanism is arranged on the base (6), the collecting and replacing mechanism is arranged at the tail ends of the first conveying assembly and the second conveying assembly.

2. The assembling device for bolts and nuts according to claim 1, wherein the first conveying assembly comprises a first elastic telescopic rod (7) fixedly arranged on the inner wall of the connecting shell (5), the telescopic end of the first elastic telescopic rod (7) is connected with a first push plate (701), an arc-shaped plate (702) is connected to the first push plate (701), the bolt body (1) comprises an end part (101) and a rod part (102), the first push plate (701) movably abuts against the end part (101), and the arc-shaped plate (702) movably abuts against the rod part (102).

3. The assembling device for bolts and nuts according to claim 2, wherein the second conveying assembly comprises a supporting plate (8) fixedly arranged on the connecting shell (5), a driving motor (9) is fixedly arranged on the supporting plate (8), the output end of the driving motor (9) is connected with a driving shaft (901), a half gear (902) is arranged on the driving shaft (901), the second conveying assembly further comprises two connecting plates (10) fixedly arranged on the second placing frame (4), the two connecting plates (10) are rotatably connected with connecting rods (11), one of the connecting rods (11) is provided with a large gear (111) meshed with the half gear (902), each connecting rod (11) is provided with a first synchronizing wheel (112), and a first belt (113) is arranged between the two first synchronizing wheels (112), be provided with first group board (1131) on first belt (113), first group board (1131) pass second rack (4) and offset with nut main part (3) activity.

4. The assembling device for the bolt and the nut according to claim 3, characterized in that the assembling component comprises a screw rod (12) and a rotating rod (13) which are rotatably connected to a base (6), a clockwork spring is sleeved on the screw rod (12) and arranged in the base (6), a pinion (121) meshed with a half gear (902) and connected with the screw rod (12) is arranged on the screw rod (12), second synchronizing wheels (14) are arranged on the screw rod (12) and the rotating rod (13), a second belt (141) is arranged between the two second synchronizing wheels (14), a moving plate (122) is in threaded connection with the screw rod (12), a sleeve (123) is rotatably connected to the moving plate (122) through a bearing, the sleeve (123) is slidably connected to the rotating rod (13), and a top plate (124) is connected to the top of the sleeve (123), the top plate (124) is movably abutted against the bolt main body (1).

5. The assembling device for the bolt and the nut as claimed in claim 4, wherein the rotating rod (13) is provided with a guide strip (131), and the inner wall of the sleeve (123) is provided with a guide groove matched with the guide strip (131).

6. The assembling equipment for bolts and nuts according to claim 3, wherein the inner wall of the first placing frame (2) is provided with a movable groove (15), the inner wall of the movable groove (15) is slidably connected with a movable plate (151), a first elastic element (152) is arranged between the movable plate (151) and the inner wall of the movable groove (15), and the bolt body (1) is movably abutted against the movable plate (151).

7. The assembling device for bolts and nuts according to claim 3, wherein a third synchronizing wheel (16) is arranged on each of the two connecting rods (11), a third belt (161) is arranged between the two third synchronizing wheels (16), second shifting plates (1611) are uniformly distributed on the third belts (161), and the second shifting plates (1611) penetrate through the connecting shell (5) and movably abut against the end part (101).

8. The assembling equipment for bolt and nut according to claim 1, characterized in that the collecting and replacing mechanism comprises a slideway (17) fixed on the base (6), the slideway (17) is provided with uniformly distributed collecting boxes (18), the collecting and replacing mechanism further comprises a driving component for driving the collecting boxes (18) to move and a positioning component for limiting the collecting boxes (18).

9. The assembling device for the bolts and the nuts according to claim 8, wherein the driving assembly comprises a first connecting plate (19) fixedly arranged on the base (6), a second elastic telescopic rod (191) is arranged on the first connecting plate (19), a second push plate (192) is connected to one end, away from the first connecting plate (19), of the second elastic telescopic rod (191), and the second push plate (192) is movably abutted to the collecting box (18).

10. An assembling apparatus for bolt and nut according to claim 8, the positioning component comprises a second connecting plate (20) fixedly arranged on the base (6), a positioning block (21) is arranged on the second connecting plate (20), a groove (211) is arranged on the positioning block (21), a positioning rod (212) is connected in the groove (211) in a sliding way, a second elastic element (213) is arranged between the positioning rod (212) and the inner wall of the groove (211), the collecting box (18) is provided with a positioning hole (181) matched with the positioning rod (212), the collection box (18) is also connected with a stress plate (182) in a sliding way, the stress plate (182) is movably propped against the bolt main body (1), and the stress plate (182) is provided with a mandril (1821), and the mandril (1821) is movably propped against the positioning rod (212).