Chain adjusting and fastening device

Abstract

The utility model provides a chain adjusting and fastening device which comprises a chain length adjusting mechanism, a bidirectional fastening mechanism and a shell, an axial through hole is formed in the middle of the side wall of the shell, the chain length adjusting mechanism comprises a transmission part and a driving shaft, the transmission part is used for being connected with a chain in a meshed mode, and the transmission part is connected to the driving shaft in a sleeved mode. The two ends of the driving shaft are rotatably connected into the axial through hole and extend out of the axial through hole, the bidirectional fastening mechanism is connected to the outside of the side wall of the shell and is in transmission connection with the driving shaft, and the bidirectional fastening mechanism has a first limiting state and a second limiting state; wherein the first limiting state is used for limiting the driving shaft to rotate in the forward direction, and the second limiting state is used for limiting the driving shaft to rotate in the reverse direction. In this way, the chain length adjusting mechanism is driven to rotate so as to adapt to the required chain length, and then a good fixing effect can be achieved through the bidirectional fastening mechanism. And if callback is needed, adjustment can be conducted after the limitation of the rotation direction is changed, state switching is convenient, and the adjustment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chain adjustment, in particular to a chain adjustment and fastening device. Background Art

[0002] Chain is a commonly used tool in current life and production. It is used to bundle some large objects or as a transmission chain. However, due to the different sizes of objects, the length requirements of the binding chain are also different. Therefore, the chain needs to be adjusted to an appropriate length and then fixed to achieve the tightening effect.

[0003] Some chain adjustment and fastening methods in the prior art are very inconvenient for binding chain length. It is often necessary to disassemble and connect the chain according to the size of the object to control the length. This operation is inconvenient and the adjustment time is long. If the chain is disassembled too much, it must be reassembled and cannot be adjusted in time. The adjustment efficiency is very low. Moreover, if the chain is not fixed stably after adjustment, the fastening effect will be unsatisfactory.

[0004] In view of this, it is necessary to propose a chain adjusting and fastening device to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of the utility model is to provide a chain adjusting and fastening device to solve the problem of low efficiency caused by long adjustment time and inability to adjust back in time in the chain adjusting and fastening method in the prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides a chain adjustment and fastening device, comprising a chain length adjustment mechanism, a two-way fastening mechanism and a housing; wherein,

[0007] The housing is provided with a chain inlet end and a chain outlet end for the chain to pass through, and the interior of the housing has an installation space for installing a chain length adjustment mechanism. The chain inlet end and the chain outlet end are both connected to the installation space, and an axial through hole is provided in the middle of the side wall of the housing and passes through in the axial direction;

[0008] The chain length adjustment mechanism includes a transmission part and a drive shaft, the transmission part is used to engage with the chain, the transmission part is arranged in the installation space and is sleeved and connected to the drive shaft, and both ends of the drive shaft are rotatably connected to the axial through hole and extend out of the axial through hole;

[0009] The bidirectional fastening mechanism is connected to the outside of the side wall of the shell and is in transmission connection with the drive shaft. The bidirectional fastening mechanism has a first limit state and a second limit state; wherein, the first limit state is used to limit the drive shaft from rotating in the forward direction, and the second limit state is used to limit the drive shaft from rotating in the reverse direction.

[0010] Preferably, the bidirectional fastening mechanism includes an annular frame, and a ratchet, a first stop, a second stop, and a reversing assembly all disposed within the annular frame, the annular frame being connected to the outside of a side wall of the housing, the ratchet being sleeved and connected to the drive shaft, the first stop and the second stop being both connected to the annular frame, and both the first stop and the second stop being telescopically disposed toward the ratchet, the reversing assembly being disposed between the first stop and the second stop and being rotatably connected to the housing;

[0011] When the reversing assembly rotates to compress the first stop member, the ratchet and the second stop member abut against each other, presenting a first limiting state; when the reversing assembly rotates to compress the second stop member, the ratchet and the first stop member abut against each other, presenting a second limiting state.

[0012] Preferably, the first stop member and the second stop member both include a stop rod and a return spring, one end of the return spring is connected to the inner side of the annular frame, the other end of the return spring is connected to the stop rod, one end of the stop rod is arranged to abut against the ratchet, and the other end of the stop rod is rotatably connected to the shell through a pin shaft.

[0013] Preferably, the reversing assembly includes a reversing rod, a pin rod and a stop block, the pin rod is rotatably connected to the shell, the stop block and the reversing rod are both sleeved on the pin rod, and the stop block is arranged between the reversing rod and the shell, and the stop block is used to be arranged to abut against one of the stop rods.

[0014] Preferably, the bidirectional fastening mechanism also includes an end cover matched with the annular frame, the end cover is provided with a mounting hole for the pin rod to pass through, the pin rod passes through and extends out of the mounting hole, the end cover is connected to the annular frame by a bolt connection cover, and the reversing rod is arranged on the outside of the end cover.

[0015] Preferably, the cross section of the stop block is triangular, and the corner ends of the stop block are provided with arc chamfers.

[0016] Preferably, the transmission part is a sprocket, and the sprocket is configured to engage with the chain.

[0017] Preferably, it further comprises a connecting hook, wherein the connecting hook is connected to the shell.

[0018] Preferably, a hand wheel is further included, and the hand wheel is sleeved on the end of the drive shaft away from the bidirectional fastening mechanism.

[0019] Preferably, the chain inlet end and the chain outlet end are both rectangular, and their lengths are both 35 mm to 40 mm.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The utility model provides a chain adjustment and fastening device, including a chain length adjustment mechanism, a two-way fastening mechanism and a shell. The shell is provided with a chain input end and a chain output end for the chain to pass through. The interior of the shell has an installation space for the chain length adjustment mechanism to be installed. The chain input end and the chain output end are both connected to the installation space, and an axial through hole is provided in the middle of the side wall of the shell along the axial direction. The chain length adjustment mechanism includes a transmission part and a drive shaft. The transmission part is used to engage and connect with the chain. The transmission part is arranged in the installation space and is sleeved and connected to the drive shaft. Both ends of the drive shaft are rotatably connected to the axial through hole and extend out of the axial through hole. The two-way fastening mechanism is connected to the outside of the side wall of the shell and is transmission-connected to the drive shaft. The two-way fastening mechanism has a first limit state and a second limit state; wherein, the first limit state is used to limit the drive shaft from rotating in the forward direction, and the second limit state is used to limit the drive shaft from rotating in the reverse direction. In this way, the chain length adjustment mechanism can be driven to rotate to adapt to the required chain length, and then the adjusted chain can be fixed through the two-way fastening mechanism. Since the single rotation direction is limited, the chain will not retract after adjustment, thereby achieving a better fixing effect. If callback is required, the rotation direction limit can be changed and then adjusted. The switching of the adjustment state is more convenient, which greatly improves the adjustment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 A three-dimensional schematic diagram of an application scenario of the overall structure in one embodiment of the present utility model;

[0024] Figure 2 This is a three-dimensional schematic diagram of the overall structure of one embodiment of the utility model after removing the end cover;

[0025] Figure 3 This is an exploded schematic diagram of the overall structure of one embodiment of the present utility model;

[0026] Figure 4 It is a three-dimensional schematic diagram of the overall structure of an embodiment of the present invention from another perspective.

[0027] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments.

[0028] Description of Figure Numbers:

[0029] 10. Chain length adjustment mechanism; 110. Transmission part; 120. Drive shaft; 130. Handwheel; 20. Bidirectional fastening mechanism; 210. Ring frame; 220. Ratchet; 230. First stopper; 231. Stop rod; 232. Return spring; 240. Second stopper; 250. Reversing assembly; 251. Reversing rod; 252. Pin rod; 253. Stop block; 260. End cover; 261. Mounting hole; 30. Housing; 310. Chain inlet end; 320. Chain outlet end; 330. Axial through hole; 40. Chain. DETAILED DESCRIPTION

[0030] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first," "second," etc. in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0034] Please see the attached Figure 1-4In one embodiment, the utility model provides a chain 40 adjustment and fastening device, which includes a chain length adjustment mechanism 10, a bidirectional fastening mechanism 20 and a shell 30. First of all, it should be noted that the axial direction in this application refers to the thickness direction along the shell 30 (the extension direction of the drive shaft 120); and it is different from some chain adjustment and fastening methods in the prior art, which are very inconvenient for bundling chain lengths. It is often necessary to disassemble and connect the chain according to the size of the object to control the length. This operation is inconvenient and the adjustment time is long. If the chain is disassembled too much, it has to be reinstalled and cannot be adjusted in time. The adjustment efficiency is very low; and if the chain is not fixed stably after adjustment, the fastening effect will be unsatisfactory. The present application solves the above-mentioned defects in the prior art by providing a chain adjustment and fastening device, which is as follows:

[0035] The housing 30 is provided with a chain-in end 310 and a chain-out end 320 for the chain 40 to pass through, and the interior of the housing 30 has an installation space for the chain-length adjustment mechanism 10 to be installed, and the chain-in end 310 and the chain-out end 320 are both connected to the installation space, and an axial through hole 330 is provided in the middle of the side wall of the housing 30; the chain-length adjustment mechanism 10 includes a transmission part 110 and a drive shaft 120, the transmission part 110 is used to engage with the chain 40, and the transmission part 110 is arranged on the installation space. The two ends of the drive shaft 120 are rotatably connected to the axial through hole 330 and extend out of the axial through hole 330; the two-way fastening mechanism 20 is connected to the outside of the side wall of the shell 30 and is transmission-connected to the drive shaft 120, and the two-way fastening mechanism 20 has a first limit state and a second limit state; wherein, the first limit state is used to limit the drive shaft 120 from rotating in the forward direction, and the second limit state is used to limit the drive shaft 120 from rotating in the reverse direction.

[0036] Specifically, the chain 40 adjustment and fastening device in the present application includes a chain length adjustment mechanism 10, a two-way fastening mechanism 20 and a shell 30. The shell 30 is used for the installation of the chain length adjustment mechanism 10 and the two-way fastening mechanism 20. At the same time, in order to facilitate the chain 40 to be adjusted through the shell 30, the shell 30 is provided with a chain input end 310 and a chain output end 320, so that the chain 40 enters from the chain input end 310 and extends from the chain output end 320. The installation space inside the shell 30 is used for the installation of the chain length adjustment mechanism 10, and the chain 40 passing through the interior is engaged with the chain length adjustment mechanism 10 installed in the installation space, so as to adjust the length of the chain 40.

[0037] The chain length adjustment mechanism 10 includes a transmission part 110 and a drive shaft 120. The transmission part 110 is used to engage with the chain 40 and is sleeved and connected to the drive shaft 120. The drive shaft 120 is rotated to drive the transmission part 110 to rotate so as to adjust the length of the chain 40. Preferably, the transmission part 110 can adopt a sprocket. The sprocket teeth on the sprocket are more in line with the chain 40 to facilitate the adjustment of the length of the chain 40. In order to facilitate the rotation of the drive shaft 120, an axial through hole 330 is opened in the middle of the side wall of the shell 30. The axial through hole 330 runs through the entire shell 30 in the axial direction so that the drive shaft 1 20 is rotatably connected to the outside of the axial through hole 330, and its two ends can also extend out of the shell 30, one end is used to connect with the bidirectional fastening mechanism 20, and the other end is used to connect with the drive assembly, thereby driving the drive shaft 120 to rotate. Preferably, the drive group assembly can adopt a handwheel 130, and the handwheel 130 can be convenient for technicians to adjust by hand, and it is more convenient to apply force. It can also be adjusted by a motor. When connecting, the handwheel 130 is sleeved on the end of the drive shaft 120 away from the bidirectional fastening mechanism 20, or the input end of the motor is connected to the drive shaft 120. Those skilled in the art can make a choice according to actual needs.

[0038] Wherein, the bidirectional fastening mechanism 20 is used to limit the rotation direction of the drive shaft 120, which is connected to the outside of the side wall of the shell 30 and is transmission-connected to the drive shaft 120, so that the rotation mode of the drive shaft 120 is limited by the bidirectional fastening mechanism 20; since the chain 40 is usually a section-by-section structure, one section of the chain 40 can be extended / shortened each time it is rotated one circle. Therefore, once it is adjusted in one direction under the limiting action of the bidirectional fastening mechanism 20, it itself cannot be naturally adjusted back under the limiting action to achieve the tightening effect; if it is necessary to adjust the length of the chain 40, the bidirectional fastening mechanism 20 is reversely limited, that is, the drive shaft 120 can only rotate in the reverse direction, thereby achieving the callback tightening effect in the reverse direction. Therefore, the bidirectional fastening mechanism 20 has a first limiting state and a second limiting state. The first limiting state is used to limit the rotation of the drive shaft 120 in the forward direction, as shown in the attached figure. Figure 1 As shown, the top of the shell 30 is the chain inlet end 310, and the chain 40 can only be pulled out upward from the chain inlet end 310; and the second limit state is used to limit the reverse rotation of the drive shaft 120. At this time, the chain 40 can only be pulled out from the chain outlet end 320 on the side of the shell 30. In this way, the limit state can be switched automatically for adjustment according to the size of the object and the required length of the chain 40.

[0039] As a preferred embodiment of the present invention, the bidirectional fastening mechanism 20 includes an annular frame 210 and a ratchet 220, a first stop 230, a second stop 240 and a reversing assembly 250 all arranged in the annular frame 210, the annular frame 210 is connected to the outside of the side wall of the housing 30, the ratchet 220 is sleeved and connected to the drive shaft 120, the first stop 230 and the second stop 240 are both connected to the annular frame 210, and the first stop 230 and the second stop 240 are 0 are both telescopically arranged toward the ratchet 220, and the reversing assembly 250 is arranged between the first stop member 230 and the second stop member 240 and is rotatably connected to the housing 30; wherein, when the reversing assembly 250 rotates to compress the first stop member 230, the ratchet 220 and the second stop member 240 abut against each other, and are in a first limited state; when the reversing assembly 250 rotates to compress the second stop member 240, the ratchet 220 and the first stop member 230 abut against each other, and are in a second limited state.

[0040] It should be noted that the annular frame 210 is used for installing the first stop 230 and the second stop 240, and is connected to the outside of the housing 30 at the position where the drive shaft 120 extends, so that the interior of the frame is an operating space for two-way switching, so that the ratchet 220, the first stop 230, the second stop 240 and the reversing assembly 250 are all arranged in the annular frame 210, and the ratchet 220 itself also has a certain effect of preventing reversal. In this application, the first stop 230 and the second stop 240 cooperate with each other to achieve two-way limit, and this two-way limit is achieved through the reversing assembly 250; specifically, the first stop 230 and the second stop 240 are both telescopically arranged toward the ratchet 220, and when the stop is in an extended state, the stop will abut against the ratchet 220, so that the ratchet 220 can only move toward the compressible When the first stop 230 is compressed, the ratchet 220 and the second stop 240 are pressed against each other, and the ratchet 220 can only rotate toward the second stop 240 due to the retractable nature of the second stop 240, that is, it is in the first limited state that restricts the rotation of the drive shaft 120 in the forward direction. Figure 2 As shown; similarly, when the reversing assembly 250 rotates to compress the second stop 240, the ratchet 220 and the first stop 230 are in abutment against each other. Due to the retractable nature of the first stop 230, the ratchet 220 can only rotate toward the first stop 230, that is, it is in a second limiting state that restricts the drive shaft 120 from rotating in the reverse direction.

[0041] As a preferred embodiment of the present invention, the first stop member 230 and the second stop member 240 both include a stop rod 231 and a return spring 232, one end of the return spring 232 is connected to the inner side of the annular frame 210, and the other end of the return spring 232 is connected to the stop rod 231, one end of the stop rod 231 is arranged to abut against the ratchet 220, and the other end of the stop rod 231 is rotatably connected to the shell 30 through a pin shaft.

[0042] It should be noted that both the first stop member 230 and the second stop member 240 adopt a combination of a stop rod 231 and a return spring 232. The stop rod 231 is used to be set to abut against the ratchet 220 to achieve a limiting effect, and the return spring 232 is used to reset the stop rod 231 after the ratchet 220 is rotated and compressed, so as to limit the reversal of the drive shaft 120 and avoid the chain 40 from returning. It is worth mentioning that the other end of the stop rod 231 is rotatably connected to the housing 30 through a pin shaft, so that the end of the stop rod 231 that is in contact with the ratchet 220 can swing around the pin shaft when the ratchet 220 rotates, and then be reset by the return spring 232, thereby achieving the effect of unidirectional rotation and reverse limiting.

[0043] As a preferred embodiment of the present invention, the reversing assembly 250 includes a reversing rod 251, a pin rod 252 and a stop block 253. The pin rod 252 is rotatably connected to the housing 30. The stop block 253 and the reversing rod 251 are both sleeved on the pin rod 252, and the stop block 253 is arranged between the reversing rod 251 and the housing 30. The stop block 253 is used to be arranged to abut against one of the stop rods 231.

[0044] It is worth noting that the stop block 253 is used to compress the first stop member 230 and the second stop member 240 respectively, which is achieved by the rotation of the pin rod 252, and the reversing rod 251 is used for technicians to operate, and by manipulating the reversing rod 251 to drive the pin rod 252 to rotate, thereby synchronously driving the stop block 253 to compress the first stop member 230 or the second stop member 240; preferably, the stop block 253 can be in the form of a triangular cross-section, so that when the stop block 253 compresses the stop rod 231, the sides of the triangle are flush with the stop rod 231, so that the compression effect is better, and the surfaces are more stably fixed to each other during compression, and will not be pushed to other positions by the spring. In order to avoid damage to the stop rod 231 when switching the stop block 253, an arc chamfer can be provided at the corner end of the stop block 253, so that it is smoother during sliding contact, which not only makes switching more convenient but also avoids the problem of bumping and damage.

[0045] As a preferred embodiment of the present invention, the bidirectional fastening mechanism 20 also includes an end cover 260 that is matched with the annular frame 210. The end cover 260 is provided with a mounting hole 261 for the pin rod 252 to pass through. The pin rod 252 passes through and extends out of the mounting hole 261. The end cover 260 is connected to the annular frame 210 by bolts, and the reversing rod 251 is arranged on the outside of the end cover 260.

[0046] It is worth noting that, since one side of the annular frame 210 is in contact with the shell 30 and the other side is open, in order to protect the components installed inside the annular frame 210, an end cover 260 can be added to cover the annular frame 210, and the end cover 260 needs to be matched with the annular frame 210. Matching here means that the shape and size of the end cover 260 and the annular frame 210 are consistent; and since the drive shaft 120 is extended out of the shell 30, a mounting hole 261 for the pin rod 252 to pass through needs to be opened on the end cover 260, wherein the end cover 260 can be connected by bolts, which is convenient for disassembly and assembly to facilitate the later maintenance of parts. When the end cover 260 is covered and connected, the reversing rod 251 is set on the outside of the end cover 260, and the stop block 253 is set on the inside of the end cover 260.

[0047] Furthermore, a connecting hook is included, and the connecting hook is connected to the shell 30.

[0048] It should be noted that the connecting hook is used to facilitate connection with other devices, thereby facilitating installation operations when adjusting the chain 40.

[0049] Furthermore, the chain inlet end 310 and the chain outlet end 320 are both rectangular, and their lengths are both 35 mm to 40 mm.

[0050] It can be understood that, considering the size of the chain 40, in order to facilitate the operation of the chain 40 in and out, the chain input end 310 and the chain output end 320 can be set to a rectangular shape, and their lengths can be set according to the size model of the chain 40. Preferably, the lengths can be set to 35mm~40mm.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A chain adjusting and fastening device, characterized in that: It includes a chain length adjustment mechanism, a two-way fastening mechanism and a shell; wherein, The housing is provided with a chain inlet end and a chain outlet end for the chain to pass through, and the interior of the housing has an installation space for installing a chain length adjustment mechanism. The chain inlet end and the chain outlet end are both connected to the installation space, and an axial through hole is provided in the middle of the side wall of the housing and passes through in the axial direction; The chain length adjustment mechanism includes a transmission part and a drive shaft, the transmission part is used to engage with the chain, the transmission part is arranged in the installation space and is sleeved and connected to the drive shaft, and both ends of the drive shaft are rotatably connected to the axial through hole and extend out of the axial through hole; The bidirectional fastening mechanism is connected to the outside of the side wall of the shell and is in transmission connection with the drive shaft. The bidirectional fastening mechanism has a first limit state and a second limit state; wherein, the first limit state is used to limit the drive shaft from rotating in the forward direction, and the second limit state is used to limit the drive shaft from rotating in the reverse direction.

2. The chain adjusting and fastening device according to claim 1, characterized in that: The bidirectional fastening mechanism includes an annular frame and a ratchet, a first stop, a second stop, and a reversing assembly all disposed within the annular frame, the annular frame being connected to the outside of the side wall of the housing, the ratchet being sleeved and connected to the drive shaft, the first stop and the second stop being both connected to the annular frame, and the first stop and the second stop being both telescopically disposed toward the ratchet, the reversing assembly being disposed between the first stop and the second stop and being rotatably connected to the housing; When the reversing assembly rotates to compress the first stop member, the ratchet and the second stop member abut against each other, presenting a first limiting state; when the reversing assembly rotates to compress the second stop member, the ratchet and the first stop member abut against each other, presenting a second limiting state.

3. The chain adjusting and fastening device according to claim 2, characterized in that: The first stop member and the second stop member both include a stop rod and a return spring, one end of the return spring is connected to the inner side of the annular frame, the other end of the return spring is connected to the stop rod, one end of the stop rod is arranged to abut against the ratchet, and the other end of the stop rod is rotatably connected to the shell through a pin shaft.

4. The chain adjusting and fastening device according to claim 3, characterized in that: The reversing assembly includes a reversing rod, a pin rod and a stop block, the pin rod is rotatably connected to the shell, the stop block and the reversing rod are both sleeved on the pin rod, and the stop block is arranged between the reversing rod and the shell, and the stop block is used to be arranged to abut against one of the stop rods.

5. The chain adjusting and fastening device according to claim 4, characterized in that: The bidirectional fastening mechanism also includes an end cover matched with the annular frame, the end cover is provided with a mounting hole for the pin rod to pass through, the pin rod passes through and extends out of the mounting hole, the end cover is connected to the annular frame by a bolt connection cover, and the reversing rod is arranged on the outside of the end cover.

6. The chain adjusting and fastening device according to claim 4, characterized in that: The cross section of the stop block is triangular, and the corner end of the stop block is provided with an arc chamfer.

7. The chain adjusting and fastening device according to claim 1, characterized in that: The transmission part is a sprocket, and the sprocket is used to be engaged with the chain.

8. The chain adjusting and fastening device according to claim 1, characterized in that: It also includes a connecting hook, which is connected to the shell.

9. The chain adjusting and fastening device according to claim 1, characterized in that: It also includes a hand wheel, which is sleeved on one end of the drive shaft away from the bidirectional fastening mechanism.

10. The chain adjusting and fastening device according to claim 1, characterized in that: The chain inlet end and the chain outlet end are both rectangular, and their lengths are both 35mm to 40mm.

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