CN112875154A

CN112875154A - Chain transmission device

Info

Publication number: CN112875154A
Application number: CN202110278133.5A
Authority: CN
Inventors: 陈泽芸; 吴义; 钱志刚; 范长湘; 刘浩城; 武龙飞; 郭靖
Original assignee: Jinyi Measurement Technology Suzhou Co ltd
Current assignee: Jinyi Measurement Technology Suzhou Co ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2021-06-01
Anticipated expiration: 2041-03-15
Also published as: CN112875154B

Abstract

The invention relates to the field of instrument and instrument calibration, in particular to a chain transmission device, which comprises: the invention discloses a support, a machine base and an assembly structure, and has the beneficial effects that: the support is used for supporting a machine base arranged on the upper portion of the support, the machine base is provided with an upper chain wheel and a lower chain wheel which are parallel to each other, a fixed distance is formed between an upper chain and the lower chain wheel which are wound on the machine base, meanwhile, the machine base is arranged from one end of the support to the other end of the support, the drooping trend of the upper chain and the lower chain is effectively relieved, the distances among the upper chain and the lower chain are kept relatively fixed, the chain shaking caused by the polygonal effect generated by chain transmission is relieved, the power from the driving portion is distributed to the upper chain wheel and the lower chain wheel through the machine base, the connecting position of the assembling structure and the upper chain and the connecting position of the assembling structure and the lower chain are kept relatively static, the stability of the assembling structure during transmission is realized, and the posture of an instrument to be conveyed is.

Description

Chain transmission device

Technical Field

The invention relates to the field of instrument and instrument calibration, in particular to a chain transmission device.

Background

Mechanical pressure gauge is widely used in many industrial processes and scientific research fields, at present, in the check-up process to the manometer, need have equipment to accomplish transmission pressure gauge, but still need to guarantee during the transmission pressure gauge that the manometer can keep stable gesture, just can make things convenient for going on of subsequent check-up process, so in the check-up of present mechanical pressure gauge, the process of transmission pressure gauge is generally accomplished through manual operation, this not only needs to spend a large amount of resources, causes the inefficiency of mechanical pressure gauge check-up, forms the contradiction rather than extensive demand.

Disclosure of Invention

The invention aims to at least solve the technical problem that the transmission of a pressure gauge needs to keep a stable posture in the prior art or the related art.

To achieve the above object, the present invention provides a chain transmission device including: a support; the stand is rotatably provided with an upper chain wheel and a lower chain wheel, the upper chain wheel and the lower chain wheel are arranged in parallel, and the stand is arranged at the upper part of the bracket; the chain comprises an upper chain and a lower chain, the upper chain is wound on the upper chain wheel, and the lower chain is wound on the lower chain wheel; the assembly structure is simultaneously connected with the upper chain and the lower chain and is used for assembling an instrument to be conveyed; the driving part is used for driving the upper chain wheel and the lower chain wheel to rotate; the machine base is arranged from one end to the other end of the support and used for distributing the power of the driving part for driving the upper chain wheel and the power of the driving part for driving the lower chain wheel.

The chain transmission device comprises a support, an upper chain wheel, a lower chain wheel, a driving part and a driving part, wherein the support is used for supporting a machine base arranged at the upper part of the support, the machine base is provided with the upper chain wheel and the lower chain wheel which are parallel to each other, so that the upper chain and the lower chain wheel wound on the support form a fixed distance, meanwhile, the machine base is arranged from one end to the other end of the support, the tendency that the upper chain and the lower chain belt sag is effectively relieved, the distances of the upper chain and the lower chain belt are kept relatively fixed, the chain jitter caused by the polygonal effect generated by chain transmission is relieved, the power from the driving part is distributed by the upper chain wheel and the lower chain wheel of the machine base, the connecting position of the assembling structure and the upper chain belt and the connecting position of the assembling structure and the lower chain belt are kept relatively.

In the above technical solution, the base further comprises a transmission shaft, and the transmission shaft is simultaneously in transmission connection with the upper chain wheel and the lower chain wheel; the engine base is provided with a first through hole which is used for being in running fit with the two ends of the transmission shaft.

This technical scheme provides the mode of the output of distribution sprocket and lower sprocket, makes the output of upper and lower sprocket keep unanimous through the transmission shaft, makes the corresponding position between the upper and lower chain keep the state of relative stillness.

In the above technical solution, the driving part is a motor, the motor includes an output shaft, and the transmission shaft of the base is in transmission connection with the output shaft.

This technical scheme provides a structure of drive chain to realize the effect of chain transport instrument.

In the above technical scheme, the bases are arranged at equal intervals from one end to the other end of the support.

In the technical scheme, the number and the arrangement mode of the bases effectively relieve the sagging trend of the upper chain and the lower chain so as to keep the distances of the upper chain and the lower chain relatively fixed.

In the above technical scheme, the assembly structure includes a clamping seat, the clamping seat is provided with an assembly hole, and the assembly hole is used for assembling the instrument to be transported.

This technical scheme provides a structure of assembly instrument, makes the stable assembly of instrument on the cassette through the pilot hole.

In the above technical solution, the fitting hole has a shape with a large upper space and a small lower space.

This technical scheme provides the cassette of an adaptation mechanical type manometer for assembly structure, makes the stable assembly of mechanical type manometer on the cassette.

In the above technical scheme, the assembly structure includes a clamping plate, first buckle structures are arranged on two opposite sides of the clamping plate, second buckle structures are arranged on two opposite sides of the clamping seat, and the first buckle structures are clamped with the second buckle structures.

In the technical scheme, the clamping plate and the clamping seat are detachably connected through the clamping structure, so that the clamping seat can be replaced according to different types of pressure gauges.

In the technical scheme, one side of the clamping plate is provided with an accommodating cavity, and the accommodating cavity protrudes out of one side of the clamping plate.

In the technical scheme, the accommodating cavity protruding out of one surface of the clamping plate can help the clamping structure to share the weight from the clamping seat, and the clamping seat is favorably supported.

In the above technical scheme, first buckle is spacing hole, second buckle structure is elasticity pin thread, the relative both sides of screens board are provided with first buckle structure, specifically do: and two opposite sides of the accommodating cavity are provided with limiting holes.

In the technical scheme, the limiting hole and the male buckle are used as a buckle structure, so that the clamping plate and the clamping seat can be detachably connected, and the clamping seat can be replaced according to different types of pressure gauges.

In the above technical solution, the assembly structure includes a first bottom plate and a second bottom plate, the first bottom plate is provided with a first bending plate bending with respect to the first bottom plate, the first bending plate is provided with a second through hole, the second bottom plate is provided with a second bending plate bending with respect to the second bottom plate, the second bending plate is provided with a third through hole, the upper chain includes a first pin shaft and a first link plate, the first pin shaft protrudes out of the first link plate, the lower chain includes a second pin shaft, the second pin shaft protrudes out of the second link plate, wherein the first bending plate and the upper chain are connected with the lower end of the first pin shaft through the second through hole in a matching manner, the second bending plate and the lower chain are connected with the upper end of the second pin shaft through the third through hole in a matching manner, the first bottom plate is connected with the other surface of the clamping plate through a bolt, the second bottom plate is connected with the other surface of the clamping plate through a bolt.

In this technical scheme, through first bottom plate and second bottom plate connection screens board and chain, make the cassette stable assembly on the chain, be favorable to the stable transmission of cassette, and then be favorable to keeping the gesture of the instrument of treating the transport.

The invention has the beneficial effects that: the support is used for supporting a machine base arranged on the upper portion of the support, the machine base is provided with an upper chain wheel and a lower chain wheel which are parallel to each other, a fixed distance is formed between an upper chain and the lower chain wheel which are wound on the machine base, meanwhile, the machine base is arranged from one end of the support to the other end of the support, the drooping trend of the upper chain and the lower chain is effectively relieved, the distances among the upper chain and the lower chain are kept relatively fixed, the chain shaking caused by the polygonal effect generated by chain transmission is relieved, the power from the driving portion is distributed to the upper chain wheel and the lower chain wheel through the machine base, the connecting position of the assembling structure and the upper chain and the connecting position of the assembling structure and the lower chain are kept relatively static, the stability of the assembling structure during transmission is realized, and the posture of an instrument to be conveyed is.

Drawings

Fig. 1 shows a schematic structural view of a chain transmission according to an embodiment of the invention;

FIG. 2 shows a schematic structural view of a chain drive according to one embodiment of the present invention;

fig. 3 shows a schematic structural view of a frame of a chain drive according to an embodiment of the invention;

FIG. 4 shows a schematic structural view of a base of a chain drive according to one embodiment of the present invention;

fig. 5 shows a schematic structural view of an assembly structure of a chain transmission according to an embodiment of the present invention;

FIG. 6 shows a schematic of a mechanical pressure gauge of a chain drive according to one embodiment of the present invention;

FIG. 7 illustrates a schematic structural view of a cartridge of a transmission according to an embodiment of the present invention;

FIG. 8 shows a schematic cross-sectional view of a cassette of a chain drive according to one embodiment of the present invention;

fig. 9 shows a schematic view of the assembly structure of the chain transmission on the chain according to one embodiment of the invention;

the relationship between the reference numbers and the names of the components is shown in the following table:

reference numerals	Name of component	Reference numerals	Name of component
				1	Support frame	421	Containing cavity
2	Engine base	422	Limiting hole
				211	Upper chain wheel	43	First base plate
212	Lower chain wheel	4301	Second through hole
				213	Transmission shaft	431	First bending plate
2131	First through hole	44	Second bottom plate
				31	Upper chain	441	Second bending plate
32	Lower chain	4402	Third through hole
				321	Second link plate	45	Bolt
322	Second pin shaft	5	Electric machine
				41	Card holder	51	Output shaft
411	Assembly hole	601	Dial plate
				412	Elastic male buckle	602	Joint
42	Clamping plate

Detailed Description

In order that the above objects, features and advantages of the present invention may be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings, which are illustrated in the appended drawings. It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Before describing the related embodiments of the present invention, the polygonal effect means that when the chain just enters the driving sprocket, the sprocket rotates by one tooth, the chain speed of the plane where the sprocket is located changes from small to large and from large to small once, and the chain moves up and down once along the plane where the sprocket is located. The chain is jerky and, due to the polygonal portion of the contact portion, non-uniformity of the motion of the chain drive is caused by the presence of the polygon. This phenomenon is known as the polygon effect of chain drives.

In this embodiment, the sprocket is rotatably disposed on the base 2, which means that the sprocket rotates on the base 2 when operating, so as to drive the chain to realize the transmission function.

Some embodiments according to the invention are described below with reference to fig. 1 to 9.

The present invention provides a chain transmission device, as shown in fig. 1 and 2, comprising: a bracket 1; the base 2 is rotatably provided with an upper chain wheel 211 and a lower chain wheel 212, the upper chain wheel 211 and the lower chain wheel 212 are arranged in parallel, and the base 2 is arranged at the upper part of the bracket 1; the upper chain 31 is wound on the upper chain wheel 211, and the lower chain 32 is wound on the lower chain wheel 212; the assembly structure is simultaneously connected with the upper chain 31 and the lower chain 32 and is used for assembling the instrument to be conveyed; the driving part is used for driving the upper chain wheel 211 and the lower chain wheel 212 to rotate; wherein the frame 2 is arranged from one end to the other end of the support 1, and the frame 2 is used for distributing the power of the driving part for driving the upper chain wheel 211 and the power for driving the lower chain wheel 212.

It can be understood that the bracket 1 is used for supporting the machine base 2, the machine base 2 is provided with an upper chain wheel 211 and a lower chain wheel 212 which are parallel to each other, so that the upper chain 31 and the lower chain 32 wound on the machine base are arranged at a fixed distance from each other, meanwhile, the machine base 2 is arranged from one end to the other end of the bracket 1, the tendency of the upper chain 31 and the lower chain 32 to sag is effectively relieved, the distances of the upper chain 31 and the lower chain 32 are kept relatively fixed, the chain vibration caused by the polygon effect generated by chain transmission is relieved, and the power from the driving part is distributed to the upper chain wheel 211 and the lower chain wheel 212 by the machine base 2, so that the connecting position of the assembling structure and the upper chain 31 and the connecting position of the assembling structure and the lower chain wheel 32 are kept relatively static, and the driving part can maintain the posture of the instrument to be conveyed on the assembling structure when the driving chain.

Specifically, the support 1 is used for supporting the base 2, so that the base 2 can function as a driving chain. The mode that frame 2 sets up on the upper portion of support 1 can be threaded connection, all sets up the screw hole on frame 2 bottom and the support 1 promptly, through the threaded connection of bolt with the screw hole, realizes that frame 2 sets up on the upper portion of support 1.

Specifically, the base 2 is provided with an upper sprocket 211 and a lower sprocket 212 which are parallel to each other, so as to facilitate a fixed distance from place to place around the upper chain 31 and the lower chain 32 provided thereon. The mode that keeps the instrument gesture stability of waiting to carry mainly has two kinds, firstly keep the stability of gesture when the instrument assembles on assembly structure, secondly keep the stability of transportation, through setting up chain wheel 211 and lower sprocket 212 that are parallel to each other, make the last chain 31 of winding on it down chain 32 also keep the state that is parallel to each other, because assembly structure meets with chain 31 and down chain 32 simultaneously, keep the position that assembly structure and chain 31 meet and the position that assembly structure and chain 32 meet unchangeable, assembly structure's stability in the transportation can be maintained, be favorable to keeping the gesture of instrument in transportation, be favorable to going on of follow-up verification process.

As shown in fig. 3 and 4, the base 2 can be rotatably provided with the sprockets in a manner that: the base 2 is provided with a first through hole 2131 which is used for being matched with two ends of the transmission shaft 213 in a rotating way, and the transmission shaft 213 is simultaneously connected with the upper chain wheel 211 and the lower chain wheel 212 in a transmission way. The transmission shaft 213 is in transmission connection with the upper chain wheel 211 and in transmission connection with the lower chain wheel 212 through the rotation matching of the first through hole 2131, the transmission shaft 213 can be in key connection, the upper chain wheel 211 and the lower chain wheel 212 are in transmission connection with the transmission shaft 213, the transmission shaft 213 is driven to drive the upper chain wheel 211 and the lower chain wheel 212 to rotate in the same direction and at the same rotating speed, the power of the upper chain wheel 211 and the power of the lower chain wheel 212 are the same, the upper chain 31 and the lower chain 32 are driven, the distance between the position where the assembly structure is connected with the upper chain 31 and the position where the assembly structure is connected with the lower chain 32 is maintained, and therefore the posture of the assembly structure in the transportation process is maintained. Optionally, as shown in fig. 3, a transmission shaft 213 is provided to be in transmission connection with the output shaft 51 of the motor 5, so as to achieve the function of the motor 5 driving the sprocket, and since the upper sprocket 211 and the lower sprocket 212 are both in transmission connection through the transmission shaft 213, the motor 5 driving the transmission shaft 213 enables the power of the upper sprocket 211 and the power of the lower sprocket 212 to be the same, thereby maintaining the distance between the corresponding positions of the upper chain 31 and the lower chain 32.

Optionally, the bases 2 are arranged at equal intervals from one end to the other end of the bracket 1, so that the sagging tendency of the upper chain 31 and the lower chain 32 is effectively relieved, the distances of the upper chain 31 and the lower chain 32 are maintained, and the chain jitter caused by the polygonal effect generated by chain transmission is relieved, so that the connection position of the assembly structure and the upper chain 31 and the connection position of the assembly structure and the lower chain 32 are kept relatively static. The number of the bases is selected according to actual conditions, such as the length of the chain, the number of meters carried by the chain and the like are considered. For example, the number of the machine bases may be 4, 6, etc., which is not limited herein.

Optionally, the planes of the upper chain wheel 211 and the lower chain wheel 212 are horizontal planes, so that the instrument to be conveyed can be transported to and fro in the horizontal direction, the conveyance of the instrument on the horizontal plane is realized, and the stability of the posture of the instrument in the horizontal direction during conveyance is maintained.

Specifically, as shown in fig. 5, 7 and 8, the assembly structure includes a cassette 41, and the cassette 41 is provided with an assembly hole 411, so that the stability of the instrument to be conveyed on the assembly structure is realized. Use mechanical type manometer as an example, mechanical type manometer generally includes dial plate 601 and joint 602, mechanical type manometer generally relies on joint 602 to realize the detection of pressure, so should grab dial plate 601 when carrying the manometer and carry out subsequent check-up procedure, be provided with pilot hole 411 at cassette 41, be favorable to the joint 602 of mechanist's manometer to stretch into pilot hole 411, and dial plate 601 supplies the usefulness of snatching, and simultaneously, because the focus of manometer is close to joint 602, so when the manometer loads on pilot hole 411, its focus also is close to pilot hole 411, thereby the stability of mechanical type manometer has been improved, in order to resist the shake that chain transmission in-process takes place. As shown in fig. 6, the joint 602 of the partial mechanical pressure gauge is in a shape that the part close to the dial 601 is large and the part far from the dial 601 is small, and the fitting hole 411 attached to the joint 602 of the mechanical pressure gauge is provided, so that the fitting hole 411 has a shape that the upper space is large and the lower space is small, and the fitting hole 411 in such a shape allows the joint 602 of the pressure gauge to completely enter the fitting hole 411 as much as possible, thereby improving the stability of the mechanical pressure gauge fitted on the fitting hole 411.

In the above embodiment, the assembling structure includes the position-locking plate 42, the two opposite sides of the position-locking plate 42 are provided with the first fastening structures, the two opposite sides of the seat 41 are provided with the second fastening structures, and the first fastening structures are fastened with the second fastening structures.

Specifically, as shown in fig. 5, the assembly structure may further include a locking plate 42, so that the locking seats 41 adapted to the pressure gauges with different specifications and sizes can be connected to the locking plate 42. By taking the spacing hole 422 as the first fastening structure and taking the elastic male buckle 412 as the second fastening structure as an example, the elastic male buckles 412 on both sides of the card seat 41 extend into the spacing hole 422 to form a fastening connection, when the card seat 41 needs to be disassembled, only the elastic male buckle 412 needs to be pressed out of the spacing hole 422, so that the card seat 41 is disconnected from the clamping plate 42, thereby realizing the replacement of the card seat 41 and being beneficial to fastening the card seats 41 with different specifications and sizes and the clamping plate 42.

Specifically, the retaining plate 42 is provided with an accommodating cavity 421 on one side, and the accommodating cavity 421 protrudes out of one side of the retaining plate 42 to support the clamping seat 41. As shown in fig. 7, the card holder 41 is provided with an elastic male buckle 412, one side of the clamping plate 42 is provided with a containing cavity 421 for containing the card holder 41, two opposite sides of the containing cavity 421 are provided with limiting holes 422, when the card holder 41 extends into the containing cavity 421, the elastic male buckles 412 arranged at the two sides are extruded from the containing cavity 421 to deform, until the card holder 41 completely extends into the containing cavity 421, the elastic male buckles 412 at the two sides recover the shape and buckle into the limiting holes 422, so as to limit the position of the card holder 41, when the card holder 41 adapted to a mechanical pressure gauge with other specifications and dimensions needs to be replaced, only the elastic male buckle 412 needs to be pressed out of the limiting holes 422, and then the card holder 41 is taken out. The receiving cavity 421 protruding from one surface can support the socket 41 to share the weight from the socket 41, which facilitates smooth transportation of the assembly structure.

Specifically, as shown in fig. 5 and 9, the assembly structure includes a first bottom plate 43 and a second bottom plate 44, the first bottom plate 43 is provided with a first bending plate 431 bent with respect to the first bottom plate 43, the first bending plate 431 is provided with a second through hole 4301, the second bottom plate 44 is provided with a second bending plate 441 bent with respect to the second bottom plate 44, the second bending plate 441 is provided with a third through hole 4402, the upper chain 31 includes a first pin shaft and a first chain plate, the first pin shaft protrudes from the first chain plate, the lower chain 32 includes a second pin shaft 322, the second pin shaft 322 protrudes from the second chain plate 321, the first bending plate 431 and the upper chain 31 are connected with the lower end of the first pin shaft through the second through hole 4301 in a matching manner, the second bending plate 441 and the lower chain 32 are connected with the upper end of the second pin shaft 322 through the third through hole 4402 in a matching manner, the first bottom plate 43 is connected with the other surface of the clamping plate 42 through a bolt 45, and the second bottom plate 44 is connected with the other surface of the clamping plate 42 through a bolt 45.

Specifically, since the first bottom plate 43 and the second bottom plate 44 have substantially the same structure and function, only the second bottom plate 44 is illustrated here. The second bottom plate 44 can be connected with the clamping plate 42 through threaded connection, the second bottom plate 44 is provided with a second bending plate 441, the chain needs to be provided with a pin shaft, and the pin shaft protrudes out of the chain plate. First bottom plate 43 and the first board 431 that bends that sets up on first bottom plate 43 realize being connected with chain 31 and screens board 42 through the same principle to with the stable assembly of assembly structure on the chain, and realize the effect of transportation instrument through the chain, make the instrument keep stable gesture in the in-process of transportation, be favorable to subsequent verification procedure.

The invention is provided with a plurality of bases 2, the upper chain wheel 211 and the lower chain wheel 212 which are parallel to each other are arranged on the bases 2, the upper chain 31 and the lower chain 32 are parallel to each other, the power for driving the upper chain wheel 211 and the lower chain wheel 212 is the same, and the assembly structure is simultaneously connected with the upper chain 31 and the lower chain wheel 32, so that the stability of the attitude of the assembly structure in the transmission process is realized, the specific attitude of an instrument to be conveyed is kept in the transportation process, and the subsequent checking process is facilitated.

In the present invention, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", 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 unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A chain drive, comprising:

a support;

the upper chain wheel and the lower chain wheel are arranged in parallel, and the base is arranged at the upper part of the bracket;

the chain comprises an upper chain and a lower chain, the upper chain is wound on the upper chain wheel, and the lower chain is wound on the lower chain wheel;

the assembly structure is simultaneously connected with the upper chain and the lower chain and is used for assembling an instrument to be conveyed;

the driving part is used for driving the upper chain wheel and the lower chain wheel to rotate;

the machine base is arranged from one end to the other end of the support and used for distributing the power of the driving part for driving the upper chain wheel and the power of the driving part for driving the lower chain wheel.

2. Chain transmission according to claim 1, characterized in that it comprises:

the machine base also comprises a transmission shaft which is in transmission connection with the upper chain wheel and the lower chain wheel;

the engine base is provided with a first through hole which is used for being in running fit with the two ends of the transmission shaft.

3. Chain transmission as claimed in claim 2, characterized in that the drive is an electric motor comprising an output shaft, the drive shaft of the machine base being in driving connection with the output shaft.

4. Chain transmission as claimed in claim 1, characterized in that the frames are arranged at equal intervals from one end of the carrier to the other.

5. Chain transmission according to claim 1, characterized in that the assembly structure comprises a cassette provided with assembly holes for assembling the instrument to be transported.

6. The chain transmission as claimed in claim 5, wherein the fitting hole has a shape with a large upper space and a small lower space.

7. The chain drive as set forth in claim 6, wherein said assembly structure includes a detent plate having first snap features disposed on opposite sides of said detent plate and second snap features disposed on opposite sides of said cassette, said first snap features snap-engaging with said second snap features.

8. The chain drive as set forth in claim 7, wherein said detent plate is provided with an accommodating cavity on one face thereof, said accommodating cavity protruding from one face of said detent plate.

9. The chain transmission as claimed in claim 8, wherein the first snap is a limiting hole, the second snap is an elastic male snap, and the two opposite sides of the detent plate are provided with first snap structures, specifically: and two opposite sides of the accommodating cavity are provided with limiting holes.

10. The chain transmission as claimed in claim 7, wherein the assembly structure comprises a first bottom plate and a second bottom plate, the first bottom plate being provided with a first bending plate bent with respect to the first bottom plate, the first bending plate being provided with a second through hole, the second bottom plate being provided with a second bending plate bent with respect to the second bottom plate, the second bending plate being provided with a third through hole, the upper chain comprising a first pin and a first link plate, the first pin protruding from the first link plate, the lower chain comprising a second pin, the second pin protruding from the second link plate,

the first bending plate and the upper chain are matched and connected with the lower end of the first pin shaft through the second through hole, the second bending plate and the lower chain are matched and connected with the upper end of the second pin shaft through the third through hole, the first bottom plate and the other side of the clamping plate are connected through bolts, and the second bottom plate and the other side of the clamping plate are connected through bolts.