CN113714787B

CN113714787B - Chain fastening device

Info

Publication number: CN113714787B
Application number: CN202010448999.1A
Authority: CN
Inventors: 付阳阳; 苏健; 马桂林; 赵瑞生; 成桂富; 刘永兵; 孙百永; 廉小增
Original assignee: CRRC Tangshan Co Ltd
Current assignee: CRRC Tangshan Co Ltd
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2023-03-31
Anticipated expiration: 2040-05-25
Also published as: CN113714787A

Abstract

The invention provides a chain fastening device, belonging to the technical field of vehicle assembly, comprising: a box body; a chain; an input torque assembly; an output torque assembly; an intermediate torque assembly; and a stop assembly. The technical effects are as follows: according to the chain fastening device provided by the invention, the input torque assembly is used for applying the torsional fastening force through tools such as a wrench, the output torque assembly and the middle torque assembly are used for transmitting the torsional fastening force to the bolt in a chain transmission mode, the middle torque assembly can increase the number of the installed bolts, and the installation efficiency is improved; simultaneously, the stopper subassembly can adjust the cooperation relation of middle moment of torsion subassembly and chain, realizes the use variety of this device, both can realize the tightening of single bolt, also can realize the tightening of a plurality of bolts.

Description

Chain fastening device

Technical Field

The invention belongs to the technical field of vehicle assembly, and particularly relates to a chain fastening device.

Background

In the production and assembly processes of vehicles such as motor train units, urban rail vehicles and the like, the fastening degree meeting the installation requirement is difficult to finish for parts assembled in a bolt locking mode due to limited operation space. When the bolt is installed by means of lengthening the wrench, increasing the force and the like, usually, the attenuation of the torque can be caused, the required torque value can not be reached, and the running safety quality accident of the vehicle is easily caused because the bolt installation quality does not reach the standard. Therefore, when the bolt cannot be fastened, two processing methods are generally adopted, one is to cancel an unimportant mounting point to complete the mounting of the component, but the process standard is difficult to meet; and the other method is to remove the interference parts in the installation space and then repair the parts after the installation of the bolts, so that a large amount of assembly time is wasted.

Based on the bolt fastening problem, a device for fastening bolts by adopting a chain transmission principle appears, and bolt fastening operation can be performed in a narrow space. However, the conventional chain fastening device generally enables only the fastening installation of a single bolt, and the installation efficiency is relatively low.

Disclosure of Invention

The invention aims to provide a chain fastening device, which aims to solve the technical problems that the traditional chain fastening device can only realize the fastening and installation of a single bolt and has relatively low installation efficiency.

In order to achieve the purpose, the invention adopts the technical scheme that: provided is a chain fastening device including: a box body; the chain is arranged in the box body; the input torque assembly comprises an input chain wheel matched with the chain and an input joint connected with the input chain wheel, and the input joint is arranged outside the box body; the output torque assembly comprises an output chain wheel matched with the chain and an output joint connected with the output chain wheel, and the output joint is arranged outside the box body; the middle torque assembly is arranged between the input torque assembly and the output torque assembly, and comprises a middle chain wheel matched with the chain and a middle joint connected with the middle chain wheel, and the middle joint is arranged outside the box body; the stopping component is arranged on the box body, when the stopping component is in an inward moving state, the stopping component is abutted against the chain, and the middle chain wheel is matched with the chain; when the stopping component is in an outward pulling state, the stopping component is separated from the chain, and the middle chain wheel is separated from the chain.

As another embodiment of the present invention, the intermediate torque assembly further comprises: the transition shaft is rotationally arranged with the middle chain wheel; the first screw is connected with the transition shaft and arranged in parallel with the chain; the sleeve is nested with the first screw in a threaded manner, wherein the box body is provided with an adjusting opening, and the sleeve is exposed out of the adjusting opening; the second screw is nested with the sleeve in a threaded manner and is coaxially arranged with the first screw, and the rotating directions of the second screw and the first screw are opposite; and the supporting piece is connected with the second screw rod and is fixed in the box body.

As another embodiment of the invention, a sliding table is arranged at the end part of the transition shaft far away from the middle chain wheel, extends out of the adjusting opening and is erected on the outer wall of the box body.

As another embodiment of the present invention, overload protection structures are provided between the output sprocket and the output joint and between the intermediate sprocket and the intermediate joint, respectively, so that the tightening force is not applied to the tightened bolt.

As another embodiment of the present invention, the overload protection structure includes: the sleeve is connected with the rotating shaft of the output chain wheel or the rotating shaft of the middle chain wheel, and a stepped hole is formed in the sleeve along the axial direction; the stepped shaft is in clearance fit with the stepped hole, one end of the stepped shaft is in clearance fit with the rotating shaft of the output chain wheel or the rotating shaft of the middle chain wheel, and the other end of the stepped shaft is connected with the output joint or the middle joint; the torque adjusting group is embedded in the sleeve in the axial direction and matched with the output joint or the middle joint, and when the torque adjusting group does not reach a preset torque, the sleeve drives the output joint or the middle joint to rotate through the torque adjusting group; when the torque adjusting group reaches the preset torque, the sleeve drives the torque adjusting group to idle.

As another embodiment of the present invention, a concave pit is formed in an end surface of the output joint or the intermediate joint, which is adjacent to the sleeve, and the sleeve is axially provided with a through hole; the torque adjustment group includes: the locking block is in threaded fit in the through hole; the torsion spring is arranged in the through hole and is pressed against the locking block; and the pressing block is partially arranged in the through hole and partially arranged in the pit and abuts against one end, far away from the locking block, of the torsion spring.

As another embodiment of the present invention, the stopper assembly includes: the lifting head is at least partially arranged outside the box body; the pin shaft is connected with the lifting head and arranged in the box body; the shaft sleeve is sleeved outside the pin shaft and is arranged at an interval with the lifting head; and the elastic piece is sleeved outside the pin shaft and is pressed between the shaft sleeve and the inner wall of the box body.

As another embodiment of the present invention, the end of the pin shaft away from the lifting head is provided with a step for limiting the axial movement of the shaft sleeve.

As another embodiment of the present invention, a limiting member is disposed on an outer wall of the box body, and when the pull head is in an outward pulling state, the limiting member is used to lock the pull head.

As another embodiment of the present invention, the limiting member is a clamping pad rotatably disposed relative to the outer wall of the box body, and when the pull head is in the outward-pulling state, the clamping pad is clamped between the outer wall of the box body and the pull head.

The chain fastening device provided by the invention at least has the following technical effects: compared with the prior art, in the chain fastening device provided by the invention, the input torque assembly is used for applying the torsional fastening force through tools such as a wrench, the output torque assembly and the middle torque assembly are used for transmitting the torsional fastening force to the bolt in a chain transmission mode, the middle torque assembly can increase the number of the installed bolts and improve the installation efficiency; simultaneously, the stopper subassembly can adjust the cooperation relation of middle moment of torsion subassembly and chain, realizes the use variety of this device, both can realize the tightening of single bolt, also can realize the tightening of a plurality of bolts.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural view of a chain fastening device according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the chain fastening device without a box cover according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of the chain fastening device of an embodiment of the present invention with the box omitted;

FIG. 4 is another schematic structural view of the chain fastening device without a box according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a case body without a lid according to an embodiment of the present invention;

FIG. 6 is a schematic illustration of a partial explosion with an overload protection structure mounted to an intermediate torque assembly in accordance with an embodiment of the present invention;

FIG. 7 is a perspective schematic view of an overload protection structure shown installed in an intermediate torque assembly in accordance with an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a stop assembly according to an embodiment of the invention.

In the figure:

10. chain fastening device

100. Case body 110, case body 120 and case cover

130. Adjusting port 200, chain 300 and input torque assembly

310. Input sprocket 320, input joint 330, input pivot

400. Output torque assembly 410, output sprocket 420, output joint

430. Output shaft 500, intermediate torque assembly 510, intermediate sprocket

520. Middle joint 522, pit 530, middle pivot

540. Transition shaft 542, slip table 550, first screw rod

560. Sleeve 570, second screw 580, support

600. Backstop subassembly 610, carry pull head 620, round pin axle

622. Step 630, shaft sleeve 640 and elastic piece

650. Limiting member 700, overload protection structure 710 and sleeve

712. Stepped hole 714, through hole 720, stepped shaft

730. Torque adjustment group 732, lock block 734, torsion spring

736. Pressing block

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Referring to fig. 1 to 8 together, a chain fastening device 10 according to an embodiment of the present invention will now be described.

Referring to fig. 1 to 3, an embodiment of the present invention provides a chain fastening device 10, including: a case 100; a chain 200 provided in the case 100; an input torque assembly 300 including an input sprocket 310 engaged with the chain 200, and an input joint 320 connected to the input sprocket 310, the input joint 320 being provided outside the casing 100; an output torque assembly 400 including an output sprocket 410 engaged with the chain 200, and an output joint 420 connected to the output sprocket 410, the output joint 420 being disposed outside the case 100; an intermediate torque assembly 500 disposed between the input torque assembly 300 and the output torque assembly 400, and including an intermediate sprocket 510 engaged with the chain 200, and an intermediate joint 520 connected to the intermediate sprocket 510, the intermediate joint 520 being disposed outside the case 100; the stopping assembly 600 is arranged on the box body 100, when the stopping assembly 600 is in an inward moving state, the stopping assembly 600 is pressed against the chain 200, and the middle chain wheel 510 is matched with the chain 200; when stop assembly 600 is in the pulled-out state, stop assembly 600 is disengaged from chain 200 and intermediate sprocket 510 is disengaged from chain 200.

In the chain fastening device 10 according to the embodiment of the present invention, the number of the intermediate torque members 500 is not limited, and a plurality of intermediate torque members 500 may be provided to be sequentially provided to the case 100 at intervals, and correspondingly, a plurality of stopper members 600 may be provided correspondingly. The embodiments of the present invention are illustrated in the drawings using an intermediate torque assembly 500 as an example.

Specifically, the box body 100 includes a box body 110 and a box cover 120, the box body 110 is used for accommodating the structures such as the chain 200, the input sprocket 310, the output sprocket 410 and the middle sprocket 510, and the box cover 120 is used for partially closing the box body 110, so that the structures such as the chain 200 and the input sprocket 310 are convenient to assemble when the device is produced. The box body 110 and the box cover 120 are generally welded, and can support and fix the input torque assembly 300, the output torque assembly 400, the intermediate torque assembly 500, the stop assembly 600, and the like.

The input torque assembly 300 includes an input sprocket 310, an input joint 320, and an input shaft 330 connecting the input sprocket 310 and the input joint 320. The input sprocket 310 is located in the box body 100, the input connector 320 is located outside the box body 100, the input connector 320 is used for being matched with tools such as a fastening wrench, the torsional fastening force of the fastening wrench is transmitted to the input sprocket 310 through the input rotating shaft 330, and the input sprocket 310 serves as a driving wheel to drive the chain 200 to rotate. The input rotating shaft 330 and the input connector 320 can be in threaded connection, so that the input connectors 320 of different types can be replaced conveniently, and the use diversity is improved.

The output torque assembly 400 includes an output sprocket 410, an output joint 420, and an output shaft 430 connecting the output sprocket 410 and the output joint 420. The output sprocket 410 is located in the case 100, and pulls the entire chain 200 together with the input sprocket 310, and the output sprocket 410 serves as a driven pulley and can transmit the torsional fastening force of the chain 200 to the output joint 420 through the output rotating shaft 430. The output connector 420 is located outside the box 100, and the output connector 420 is used for being matched with a spanner head with a corresponding specification or directly matched with a bolt to indirectly or directly transmit the torsional fastening force to the bolt. The output rotating shaft 430 and the output connector 420 can be in threaded connection, so that the output connectors 420 of different models can be replaced conveniently, and the use diversity is improved.

Intermediate torque assembly 500 includes an intermediate sprocket 510, an intermediate joint 520, and an intermediate rotational shaft 530 connecting intermediate sprocket 510 and intermediate joint 520. The intermediate sprocket 510 is located inside the case 100 between the input sprocket 310 and the output sprocket 410, and serves as a driven pulley that can transmit the torsional fastening force of the chain 200 to the intermediate joint 520 through the intermediate rotating shaft 530. The intermediate joint 520 is located outside the box body 100, and the intermediate joint 520 is used for being matched with a wrench head with a corresponding specification or directly matched with a bolt, so that the torsional fastening force is indirectly or directly transmitted to the bolt. So set up, when the fastening spanner applys twist reverse fastening force, can make output joint 420 and intermediate head 520 screw up the bolt of corresponding position in step, realize the screwing up of a plurality of bolts, improved the installation effectiveness. The middle rotating shaft 530 and the middle joint 520 can be in threaded connection, so that the middle joints 520 of different types can be replaced conveniently, and the use diversity is improved.

Stop assembly 600 is used to engage or disengage intermediate torque assembly 500 from chain 200. In the embodiment of the invention, the length of the chain 200 is set to be slightly longer, when the stopping component 600 is in an inward moving state, the stopping component 600 is pressed against the side edge of the chain 200, the chain 200 is relatively tight, the middle torque component 500 is matched with the chain 200, and at the moment, the middle torque component 500 participates in bolt tightening operation; when the stopping assembly 600 is in the outward-pulling state, the stopping assembly 600 is separated from the side edge of the chain 200, the chain 200 is relatively loose, the intermediate torque assembly 500 is disengaged from the chain 200, and at the moment, the intermediate torque assembly 500 does not participate in the bolt tightening operation. So configured, the stop assembly 600 functions to tension the chain 200, and can adjust the fit relationship between the intermediate torque assembly 500 and the chain 200.

It is understood that the outward-pulled state and the inward-moved state refer to a positional relationship of the stopper member 600 with respect to the case 100, and are defined as an outward-pulled state when one end of the stopper member 600 is pulled a certain distance away from the case 100; when one end of the stopper member 600 moves close to the case 100 by a certain distance, it is defined as an inward movement state.

For example, when the brake system pressure switch bracket bolt and the front-end system bolt need to be fastened, the middle torque assembly 500 and the output torque assembly 400 can be used for synchronously screwing the two bolts, so that the mounting quality of the two bolts can be improved, and the safety quality accident of the vehicle can be avoided. The chain fastening device 10 provided by the embodiment of the invention can simultaneously tighten a single bolt or a plurality of bolts in a narrow space, and improves the installation efficiency. Especially, in the process of vehicle assembly, the operation space is limited, and the device is narrow in shape, can stretch into narrow space to carry out bolt tightening operation, is not influenced by other parts, guarantees the reliability of bolt fastening when the vehicle is assembled, and provides powerful guarantee for the assembly quality and safe operation of the vehicle. Compared with a fastening structure utilizing a planet wheel principle, the structure has the advantages that the appearance volume can be greatly reduced, and the structure is suitable for a narrow space.

The chain fastening device 10 provided by the embodiment of the invention has at least the following technical effects: compared with the prior art, in the chain fastening device 10 provided by the embodiment of the invention, the input torque assembly 300 is used for applying torsional fastening force through a tool such as a wrench, the output torque assembly 400 and the intermediate torque assembly 500 are used for transmitting the torsional fastening force to the bolts in a transmission mode of the chain 200, the number of the bolts mounted by the intermediate torque assembly 500 can be increased, and the mounting efficiency is improved; meanwhile, the stop component 600 can adjust the matching relation between the middle torque component 500 and the chain 200, so that the use diversity of the device is realized, and not only can the screwing of a single bolt be realized, but also the screwing of a plurality of bolts can be realized.

Referring to fig. 2 to 5, as an embodiment of the present invention, the intermediate torque assembly 500 further includes: a transition shaft 540 rotatably disposed with the intermediate sprocket 510; a first screw 550 connected to the transition shaft 540 and disposed parallel to the chain 200; a sleeve 560, which is embedded in the first screw 550 by a screw thread, wherein the box 100 is provided with an adjusting opening 130, and the sleeve 560 is exposed out of the adjusting opening 130; a second screw 570, which is nested with the sleeve 560 and is coaxial with the first screw 550, wherein the rotation direction of the second screw 570 is opposite to that of the first screw 550; and a supporter 580 connected to the second screw 570 and fixed in the case 100. The above structure can adjust the position of the intermediate sprocket 510, and adjust the distance between the intermediate sprocket 510 and the output sprocket 410 according to the actual bolt position.

Specifically, the transition shaft 540 is clearance-fitted with the intermediate sprocket 510, or the transition shaft 540 has a circumferential key slot capable of limiting the axial movement of the intermediate sprocket 510, so that the intermediate sprocket 510 can rotate relative to the transition shaft 540, and the transition shaft 540 can drive the intermediate sprocket 510 to move along the extending direction of the chain 200. The first screw 550 and the second screw 570 are both threadedly nested in the sleeve 560, the rotation directions of the first screw 550 and the second screw 570 are opposite, for example, the first screw 550 is right-handed, the second screw 570 is left-handed, and the rotation direction of the sleeve 560 is adjusted through the adjusting opening 130, so that the transition shaft 540 drives the intermediate sprocket 510 and the intermediate joint 520 to move back and forth along the extending direction of the chain 200, so as to adjust the distance between the intermediate sprocket 510 and the output sprocket 410, and correspondingly match the distance between the adjacent bolts. The supporting member 580 may be a plate or a rod for fixing the second screw 570, and the second screw 570, the sleeve 560 and the first screw 550 may indirectly support the transition shaft 540, the intermediate sprocket 510, the intermediate rotating shaft 530 and the intermediate joint 520, so as to ensure that the intermediate sprocket 510 does not shift during the rotation process.

The sleeve 560 is at least partially exposed from the adjustment opening 130, and the sleeve 560 may or may not extend out of the adjustment opening 130, as long as the sleeve 560 can be operated through the adjustment opening 130. When the rotational directions of the sleeve 560 and the first screw 550 are matched, the first screw 550 drives the transition shaft 540, the middle chain wheel 510 and the like to move relative to the sleeve 560; when the rotational directions of the sleeve 560 and the second screw 570 are matched, the sleeve 560 drives the first screw 550, the transition shaft 540, the middle sprocket 510, and the like to move relative to the second screw 570. This enables the position adjustment of the intermediate sprocket 510.

Further, the end of the transition shaft 540 far away from the middle sprocket 510 is provided with a sliding table 542, and the sliding table 542 extends out of the adjustment opening 130 and is erected on the outer wall of the box body 100. In order to guarantee that transition axle 540 drives middle sprocket 510, middle pivot 530 and intermediate head 520 are at the removal in-process of adjustment position, can be more steady, obtain better guidance quality, in this embodiment, be equipped with the slip table 542 of erectting in the box body 100 outer wall at the tip of transition axle 540, slip table 542 stretches out from adjustment mouth 130, can slide for the box body 100 outer wall, limiting action through adjustment mouth 130, can make transition axle 540 reduce at the removal in-process and rock, more steady.

Referring to fig. 3, 6 and 7, as a specific implementation of the embodiment of the present invention, overload protection structures 700 are provided between the output sprocket 410 and the output joint 420 and between the intermediate sprocket 510 and the intermediate joint 520, so that the tightening force is not applied to the tightened bolt. Because the bolt fastening degree is different, or because chain 200 transmission problem for when screwing up a plurality of bolts simultaneously, some of them bolt is screwed up easily to appear, some other bolts have not been screwed up yet, in order to avoid exerting the clamping force again to the bolt that has already screwed up, increased overload protection structure 700 in this embodiment, can make the bolt that screws up no longer exert clamping force, and the bolt that has not been screwed up continues to be exerted clamping force, makes all bolts all screwed up, also can not damage the bolt that screws up.

Further, the overload protection structure 700 includes: a bushing 710 connected to a rotational shaft of the output sprocket 410 or a rotational shaft of the middle sprocket 510, the bushing 710 having a stepped hole 712 formed along an axial direction; a stepped shaft 720 which is clearance-fitted to the stepped hole 712, has a clearance with the rotational shaft of the output sprocket 410 or the rotational shaft of the intermediate sprocket 510 at one end, and is connected to the output joint 420 or the intermediate joint 520 at the other end; the torque adjusting set 730 is axially embedded in the sleeve 710 and is matched with the output joint 420 or the middle joint 520, and when the torque adjusting set 730 does not reach a preset torque, the sleeve 710 drives the output joint 420 or the middle joint 520 to rotate through the torque adjusting set 730; when the torque adjusting set 730 reaches the predetermined torque, the sleeve 710 drives the torque adjusting set 730 to idle. In this embodiment, the output shaft 430 or the middle shaft 530 drives the sleeve 710 to rotate, and the sleeve 710 drives the output joint 420 or the middle joint 520 to rotate.

Specifically, the overload protection structure 700 is provided between the intermediate sprocket 510 and the intermediate joint 520, for example. The sleeve 710 and the intermediate shaft 530 may be screwed to facilitate the replacement of different types of overload protection structures 700 and intermediate joints 520. The sleeve 710 has a stepped hole 712 formed in a central axis direction, the stepped shaft 720 is in clearance fit with the stepped hole 712, and a gap is formed between the stepped shaft 720 and the intermediate rotating shaft 530, so that the stepped shaft 720 can rotate relative to the sleeve 710 without departing from the sleeve 710 and is retained in the stepped hole 712, and further the intermediate joint 520 can rotate relative to the sleeve 710 without departing from the sleeve 710.

The torque adjustment sets 730 may be provided in plurality, uniformly embedded in the sleeve 710, and axially disposed and partially engaged with the intermediate joint 520, for example, the torque adjustment sets 730 may be provided in three. The torque adjustment group 730 may adjust the torque value and may reset to the initial state during rotation. When the torque adjusting set 730 does not reach the preset torque, the structure of the torque adjusting set 730 matched with the middle joint 520 can drive the middle joint 520 to rotate; when the torque adjusting set 730 reaches the predetermined torque, the structure of the torque adjusting set 730 coupled to the middle joint 520 cannot drive the middle joint 520 to rotate, so that the middle shaft 530 drives the sleeve 710 to idle.

Furthermore, the output joint 420 or the middle joint 520 has a concave 522 near the end surface of the sleeve 710, and the sleeve 710 has a through hole 714 along the axial direction; the torque adjustment group 730 includes: a locking block 732 in threaded engagement within the through hole 714; a torsion spring 734 disposed in the through hole 714 and pressed against the locking block 732; and a pressing block 736, which is partially disposed in the through hole 714 and partially disposed in the pit 522, and presses against an end of the torsion spring 734 far away from the locking block 732. In this embodiment, the overload protection structure 700 is provided between the intermediate sprocket 510 and the intermediate joint 520, for example.

A pit 522 is formed in the end face of the middle joint 520, which is adjacent to the sleeve 710, a pressing block 736 is partially arranged in the pit 522 and partially arranged in the through hole 714, and the torsion spring 734 is pressed between the locking block 732 and the pressing block 736. The pressing block 736 may be a ball, a tip block, etc., as long as it is partially located in the recess 522 and partially located in the through hole 714. The depth of the locking block 732 in threaded fit with the through hole 714 is adjusted through external force, the locking block 732 can drive the torsion spring 734 to compress and twist, the locking block 732 gradually resets to an initial state in the process of rotating the sleeve 710 by means of the elastic force and the twisting force of the torsion spring 734, and when the locking block 732 is adjusted to a certain depth in the through hole 714, the pressing block 736 is pressed by the torsion spring 734 with a large acting force and can be clamped in the concave pit 522 to drive the intermediate joint 520 to rotate; when the locking block 732 is gradually reset to the initial state under the action of the torsion spring 734, the pressing block 736 is pressed by the torsion spring 734 with a small acting force and cannot be clamped in the dimple 522, and when the sleeve 710 rotates, the pressing block 736 overcomes the acting force of the dimple 522 and retracts into the through hole 714, so that the sleeve 710 idles. In this way, it can be achieved that the tightening bolt is no longer acted upon.

It will be appreciated that the depth to which the lock block 732 is threadably engaged in the through hole 714 correspondingly matches the torque required for the bolt, and that the lock block 732 may be adjusted to different depths depending on the bolt. The head of the lock block 732 is provided with a straight or cross-shaped slot for easy manipulation with a tool.

Referring to fig. 1 to 4 and 8, as an embodiment of the present invention, a stop assembly 600 includes: a pull head 610 disposed at least partially outside the case 100; a pin 620 connected to the pulling head 610 and disposed in the case 100; a shaft sleeve 630, which is sleeved outside the pin shaft 620 and is arranged at an interval with the lifting head 610; and the elastic element 640 is sleeved outside the pin 620, and the elastic element 640 is pressed between the shaft sleeve 630 and the inner wall of the box 100. Specifically, a through hole is formed in a corresponding position of the box 100, so that the pulling head 610 and the pin 620 can extend out of the box 100 from the through hole. The pulling head 610 and the pin 620 may be welded or screwed. The elastic member 640 is a compression spring, which can assist the lifting head 610 to return, and can also make the shaft sleeve 630 press against the side of the chain 200.

When no external force is applied to the pull head 610, the stopping assembly 600 is in an inward moving state, and the shaft sleeve 630 is pressed against the side edge of the chain 200 under the action of the elastic member 640, so that the chain 200 is relatively tightened, and the intermediate torque assembly 500 participates in the bolt locking operation. When an external force pulling away from the outer wall of the box body 100 is applied to the pulling head 610, the stopping assembly 600 is in an outward pulling state, so that the pulling head 610 drives the pin shaft 620 and the shaft sleeve 630 to move towards the direction close to the inner wall of the box body 100, and further the shaft sleeve 630 is separated from the abutting limitation on the side edge of the chain 200, so that the chain 200 is relatively loose, and further the middle torque assembly 500 does not participate in the bolt locking operation.

Further, the end of the pin 620 remote from the lift head 610 is provided with a step 622 for limiting axial movement of the boss 630. Because the pin 620 needs to drive the shaft sleeve 630 to press against the side edge of the chain 200 for multiple times in the using process, in order to prevent the pin 620 and the shaft sleeve 630 from being disengaged due to fatigue damage, in this embodiment, a step 622 is disposed at the end of the pin 620 far away from the pulling head 610, and the radial dimension of the step 622 is greater than the major diameter dimension of the shaft sleeve 630, so that the shaft sleeve 630 can be prevented from falling off from the end of the pin 620. Of course, the cross section of the step 622 is not limited to a circle, and may be a rectangle, a polygon, etc., as long as the circumferential profile of the step 622 covers the circumferential profile of the sleeve 630.

Further, the outer wall of the case 100 is provided with a stopper 650, and the stopper 650 is used to lock the pull head 610 when the pull head 610 is in the pulled-out state. In order to prevent the device from affecting the bolt fastening effect due to the space interference of the intermediate torque assembly 500 when fastening a single bolt in a narrow space, in this embodiment, a limiting member 650 is disposed on the outer wall of the box body 100, and the limiting member 650 can lock the pulling head 610 after removing the external force applied to the pulling head 610, so that the pulling head 610 maintains an outward-pulling state, and it is ensured that the shaft sleeve 630 does not press against the side edge of the chain 200, and the intermediate sprocket 510 in the intermediate torque assembly 500 is in a disengaged state from the chain 200.

Further, the stopper 650 is a pad rotatably disposed with respect to the outer wall of the case 100, and the pad is clamped between the outer wall of the case 100 and the pulling head 610 when the pulling head 610 is in the pulled-out state. In this embodiment, there is a radial difference between the pulling head 610 and the pin 620, that is, the radial dimension of the pulling head 610 is greater than the radial dimension of the pin 620, when the pulling head 610 is in the outward-pulling state, the pulling head 610 is entirely located on the outer wall of the case 100, the clamping pad is rotated between the pulling head 610 and the outer wall of the case 100, the pulling head 610 is restricted from retracting into the case 100 by the end-face abutting manner, at this time, the external force applied to the pulling head 610 is removed, the pulling head 610 can maintain the outward-pulling state, so that when the device performs the bolt fastening operation in a narrow space, the intermediate torque assembly 500 does not generate a spatial interference to the chain 200.

The clamping pad may be a pad, a cushion block, a rod, etc., and may be in contact with the outer wall of the lifting head 610 and the outer wall of the box 100. The rotation setting can be realized to the pivot that the card pad was fixed in box body 100, namely, this pivot is located to the card pad cover, and can take place relative rotation for this pivot, and simultaneously, the card pad does not break away from this pivot, for example, card pad and pivot clearance fit, or, the pivot has the circumference keyway that can restrict card pad axial displacement etc..

In addition, the stopper 650 may be provided to a jaw of the case 100, and may selectively clamp the pull head 610 so that the pull head 610 maintains a corresponding state.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A chain fastening device, comprising:

a box body;

the chain is arranged in the box body;

the input torque assembly comprises an input chain wheel matched with the chain and an input joint connected with the input chain wheel, and the input joint is arranged outside the box body;

the output torque assembly comprises an output chain wheel matched with the chain and an output joint connected with the output chain wheel, and the output joint is arranged outside the box body;

the intermediate torque assembly is arranged between the input torque assembly and the output torque assembly, and comprises an intermediate chain wheel matched with the chain and an intermediate joint connected with the intermediate chain wheel, and the intermediate joint is arranged outside the box body; and

the stopping component is arranged on the box body, when the stopping component is in an inward moving state, the stopping component is pressed against the chain, and the middle chain wheel is matched with the chain; when the stopping component is in a pull-out state, the stopping component is separated from the chain, and the middle chain wheel is disengaged from the chain;

the stopper assembly includes:

the lifting head is at least partially arranged outside the box body;

the pin shaft is connected with the lifting head and arranged in the box body;

the shaft sleeve is sleeved outside the pin shaft and is arranged at an interval with the lifting head; and

the elastic piece is sleeved outside the pin shaft and is pressed between the shaft sleeve and the inner wall of the box body;

the outer wall of the box body is provided with a limiting piece, and when the lifting head is in an outward pulling state, the limiting piece is used for locking the lifting head;

overload protection structures are arranged between the output chain wheel and the output joint and between the middle chain wheel and the middle joint, and are used for preventing the tightened bolt from being applied with fastening force;

the overload protection structure includes:

the sleeve is connected with the rotating shaft of the output chain wheel or the rotating shaft of the middle chain wheel, and a stepped hole is formed in the sleeve along the axial direction;

the stepped shaft is in clearance fit with the stepped hole, one end of the stepped shaft is in clearance fit with the rotating shaft of the output chain wheel or the rotating shaft of the middle chain wheel, and the other end of the stepped shaft is connected with the output joint or the middle joint; and

the torque adjusting group is embedded in the sleeve along the axial direction and matched with the output joint or the middle joint, and when the torque adjusting group does not reach a preset torque, the sleeve drives the output joint or the middle joint to rotate through the torque adjusting group; when the torque adjusting group reaches a preset torque, the sleeve drives the torque adjusting group to idle;

the end face of the output joint or the middle joint, which is adjacent to the sleeve, is provided with a pit, and the sleeve is provided with a through hole along the axial direction; the torque adjustment group includes:

the locking block is in threaded fit in the through hole;

the torsion spring is arranged in the through hole and is pressed against the locking block; and

and the pressing block is partially arranged in the through hole and partially arranged in the pit and abuts against one end, far away from the locking block, of the torsion spring.

2. The chain fastening device as recited in claim 1, wherein said intermediate torque assembly further comprises:

the transition shaft is rotationally arranged with the middle chain wheel;

the first screw is connected with the transition shaft and arranged in parallel with the chain;

the sleeve is nested with the first screw in a threaded manner, wherein the box body is provided with an adjusting opening, and the sleeve is exposed out of the adjusting opening;

the second screw is nested with the sleeve in a threaded manner and is coaxially arranged with the first screw, and the rotating directions of the second screw and the first screw are opposite; and

and the supporting piece is connected with the second screw rod and is fixed in the box body.

3. The chain fastening device as claimed in claim 2, wherein a sliding platform is provided at an end of the transition shaft away from the intermediate sprocket, the sliding platform extending out of the adjustment opening and mounted on an outer wall of the case body.

4. The chain fastener as claimed in claim 1, wherein an end of said pin remote from said pull head is provided with a step for limiting axial movement of said boss.

5. The chain fastening device according to claim 1, wherein the stopper is a catching pad rotatably provided with respect to the outer wall of the case body, and the catching pad is caught between the outer wall of the case body and the pull-up head when the pull-up head is in the pulled-out state.