CN220770065U

CN220770065U - Eccentric transmission mechanism

Info

Publication number: CN220770065U
Application number: CN202322568956.9U
Authority: CN
Inventors: 陈东明; 熊斌; 赵方明
Original assignee: Power Idea Technology Shenzhen Co Ltd
Current assignee: Power Idea Technology Shenzhen Co Ltd
Priority date: 2023-09-20
Filing date: 2023-09-20
Publication date: 2024-04-12
Anticipated expiration: 2033-09-20

Abstract

The utility model provides an eccentric transmission mechanism, which comprises a base body, a transmission part rotationally connected with the base body, a trigger part connected with the transmission part and a moving part connected with the base body, wherein the trigger part is connected with the base body; the transmission component comprises a main shaft rotationally assembled on the base body and an eccentric shaft which is connected with the main shaft and is eccentrically arranged with the main shaft; the trigger component is used for driving the transmission component to rotate clockwise around the main shaft; the eccentric shaft penetrates through the moving component, and the moving component is used for moving linearly along with the rotation of the transmission component. The eccentric transmission mechanism is simple in structure and small in size, material cost can be greatly saved, meanwhile, the triggering part can easily drive the transmission part to rotate, rotary motion is converted into linear motion of the moving part through the transmission part, and the flexibility of a transmission function is realized while the structure is simplified.

Description

Eccentric transmission mechanism

Technical Field

The utility model belongs to the field of electronic equipment, and particularly relates to an eccentric transmission mechanism.

Background

The crank mechanism, the screw rod mechanism, the cam mechanism and the like are transmission mechanisms capable of converting rotary motion into linear lifting motion, and the mechanism has a complex structure and high part precision requirement and is commonly used in large-scale complex machines such as factory production equipment or automobiles. In the factory, some electronic devices are also required to be provided with a transmission mechanism for being convenient for engineers to operate, and the complex transmission mechanism has high manufacturing cost, large occupied volume and more consumed materials and is not suitable for various electronic devices with relatively small volume. There is a need for a power-efficient, compact, and flexible transmission mechanism that meets the application requirements of electronic devices.

Disclosure of Invention

The utility model aims to provide an eccentric transmission mechanism, which aims to solve the problems that the transmission mechanism is complex in structure, high in manufacturing cost, and not suitable for electronic equipment, and occupies too large volume.

In order to solve the technical problems, the utility model is realized in such a way that an eccentric transmission mechanism comprises: a base body, a transmission part rotationally connected to the base body, a trigger part connected to the transmission part and a moving part connected to the base body;

the transmission part comprises a main shaft rotationally assembled on the base body and an eccentric shaft connected with the main shaft and eccentrically arranged with the main shaft;

the trigger component is used for driving the transmission component to rotate clockwise around the main shaft;

the eccentric shaft penetrates through the moving component, and the moving component is used for moving linearly along with the rotation of the transmission component.

Further, the cross section external contour of the eccentric shaft perpendicular to the axial direction is a closed ring shape with smooth edges, and the widest width direction of the cross section is perpendicular to the radial direction of the main shaft.

Further, the moving part is provided with a transmission hole, and the eccentric shaft is arranged in the transmission hole in a penetrating way; and the side wall of the transmission hole is provided with a clamping part matched with the eccentric shaft.

Further, the transmission part further comprises a fixing piece connected between the main shaft and the eccentric shaft, and a transition surface gradually reducing along the length extending direction is formed between the eccentric shaft and the fixing piece.

Further, the fixing pieces comprise a first fixing piece, a second fixing piece and a third fixing piece which are sequentially arranged towards the extending direction of the main shaft;

the main shaft and the eccentric shaft are integrally formed on a first fixing piece, the second fixing piece is fixedly connected with the first fixing piece and rotatably connected with a third fixing piece, and the third fixing piece is fixedly connected with the base body.

Further, the eccentric transmission mechanism further comprises a limiting piece rotationally connected to the base body, the limiting piece is provided with a limiting groove, and the eccentric shaft comprises a body and a limiting part, wherein the body is far away from the main shaft, the body is sequentially connected in the direction of the main shaft, and the limiting part penetrates through the limiting groove.

Further, two adjacent side edges, close to the limiting groove, of the limiting part are abutted against the inner wall of the corresponding limiting groove.

Further, the projection of the limiting part along the axial direction of the main shaft is in the body, and the body is abutted against the surface of the limiting part facing to one side of the main shaft.

Further, one end of the main shaft extends out of the base body and is fixedly connected to the trigger component.

Further, one end of the main shaft, which is close to the trigger part, is outwards protruded with a plurality of fixed blocks, and the trigger part is provided with a fixed groove matched with the fixed blocks.

Compared with the prior art, the eccentric transmission mechanism has the beneficial effects that: in the eccentric transmission mechanism for the electronic equipment, the transmission component comprises a main shaft rotationally assembled on the base body and an eccentric shaft which is connected with the main shaft and is eccentrically arranged with the main shaft, the triggering component can drive the transmission component to rotate around the main shaft in a time needle direction, and the eccentric shaft penetrates through the moving component, so that the moving component linearly moves along with the rotation of the transmission component, and the transmission component formed by the main shaft and the eccentric shaft eccentrically arranged with the main shaft has simple structure and smaller volume, and can greatly save material cost; the force applied to the trigger component can easily drive the transmission component to rotate, and the rotation motion is converted into linear motion of the moving component through the transmission component, so that the flexibility of the transmission function is realized while the structure is simplified.

Drawings

FIG. 1 is an exploded view of an eccentric drive mechanism in an embodiment of the utility model;

FIG. 2 is a schematic view of a portion of a transmission component in an embodiment of the utility model;

FIG. 3 is a schematic view of a portion of a limiting member according to an embodiment of the present utility model;

FIG. 4 is a rear view of a portion of the structure of an eccentric drive mechanism in an embodiment of the present utility model;

FIG. 5 is a schematic view of the overall structure of a handle in an embodiment of the utility model;

fig. 6 is a rear view of a transmission member in an embodiment of the utility model.

In the drawings, each reference numeral denotes: 10. an eccentric transmission mechanism; 100. a base; 110. a top cover; 111. positioning columns; 112. a mounting groove; 1121. a mounting hole; 113. a dust cover; 120. a front shell; 130. a rear case;

200. a transmission member; 210. a main shaft; 211. a fixed block; 220. an eccentric shaft; 221. a first semicircular portion; 222. a second semicircular portion; 223. a limit part; 224. a transition surface; 230. a fixing piece; 231. a first fixing piece; 232. a second fixing piece; 233. a third fixing piece;

300. a trigger member; 310. a handle; 311. a fixing groove; 320. a gasket;

400. a moving member; 410. a transmission member; 411. a transmission hole; 4111. a clamping part; 4111a, plane; 4111b, arcuate transition surfaces; 420. pressing the bulge;

500. a limiting piece; 510. a fixing part; 511. a first fixed cylinder; 5111. a fixed cover; 512. a fixing nut; 513. a second fixed cylinder; 514. a fixing pin; 520. a movable part; 521. fixing the column; 5211. a first fixing column; 5212. a second fixing column; 5213. a third fixing column; 522. positioning columns; 523. a connecting arm; 524. a limiting block; 5241. a limit groove; 530. a key.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are exemplary and intended to illustrate the present utility model and should not be construed as limiting the utility model, and all other embodiments, based on the embodiments of the present utility model, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Examples:

in this embodiment, referring to fig. 1-6, an eccentric transmission mechanism 10 includes: the base 100, the transmission member 200 rotatably coupled to the base 100, the trigger member 300 coupled to the transmission member 200, and the moving member 400 coupled to the base 100.

The transmission member 200 includes a main shaft 210 rotatably mounted to the base 100, and an eccentric shaft 220 coupled to the main shaft 210 and eccentrically disposed with respect to the main shaft 210. The triggering component 300 is used for driving the transmission component 200 to rotate around the main shaft 210 in a time needle direction. Eccentric shaft 220 is inserted into moving member 400, and moving member 400 is configured to linearly move as driving member 200 rotates.

Specifically, in the present embodiment, as shown in fig. 1 and 2, the base 100 includes a top cover 110, a front case 120, and a rear case 130, and the top cover 110, the front case 120, and the rear case 130 enclose a housing cavity of the eccentric transmission mechanism 10. The transmission part 200 and the moving part 400 are accommodated in the accommodating cavity, the main shaft 210 of the transmission part 200 protrudes out of the accommodating cavity, and one end of the triggering part 300 is connected to the main shaft 210, so that the movement of the transmission shaft in the accommodating cavity in the three-dimensional direction is limited, the transmission shaft is fixed on the base body 100, and the transmission shaft can rotate around the main shaft 210 in any time needle direction.

The top cover 110 is vertically protruded with two positioning posts 522, the moving component 400 is located between the two positioning posts 522, two opposite side edges are abutted to the two positioning posts 522, and the positioning posts 522 are used for limiting the movement of the moving component 400 in the horizontal direction. The moving part 400 includes a driving part 410 and a pressing protrusion 420 positioned under the driving part 410, the front case 120 is provided with a protrusion opening matched with the pressing protrusion 420, a projection of the pressing protrusion 420 in a vertical direction is positioned in the protrusion opening, and the pressing protrusion 420 and the protrusion opening serve to further limit the movement of the moving part 400 toward the spindle 210. The above arrangement enables the moving member 400 to make a linear movement in a vertical direction by a certain distance.

The main shaft 210 is a cylinder with a radius uniformly decreasing toward the length extension direction, and the main shaft 210 is used as a transmission shaft of the eccentric transmission mechanism 10. One end of the triggering component 300 is connected to the main shaft 210, and one end of the triggering component 300, which is far away from the main shaft 210, is used for applying force and driving the transmission component 200 to rotate around the main shaft 210 in a time needle direction, and the eccentric shaft 220 rotates along with the main shaft 210 in the time needle direction and drives the moving component 400 to linearly move. The design of the main shaft 210 and the eccentric shaft 220 can enable the moving part 400 to reach the maximum moving distance in the shortest rotating stroke, so that labor and space are saved, the transmission mechanism is small in size and light in weight, the whole occupied space of the transmission mechanism is small, materials are further saved, the manufacturing cost is reduced, and the use requirement of the field of electronic equipment on the transmission mechanism can be met.

In other embodiments, the moving structure and the base 100 may be connected by a structure such as a chute.

Further, the outer profile of the cross section of the eccentric shaft 220 perpendicular to the axial direction thereof is a closed ring shape with smooth edges, and the widest width direction of the cross section is perpendicular to the radial direction of the main shaft 210.

Specifically, in the present embodiment, as shown in fig. 2, 4 and 6, the closed ring shape includes two ellipses sharing a main diameter α, the main diameter α being disposed along the widest width direction of the closed ring shape cross section, the length of the minor axis β of the ellipse close to the axis of the main shaft 210 being smaller than the main diameter α, and the major axis γ of the ellipse away from the axis of the main shaft 210 being greater than or equal to the main diameter α, β+γ < α. Preferably, 1.ltoreq.γ: alpha is less than or equal to 1.2. As an example, β: α=0.5, γ: α=1.125.

The parameter gamma of two closed annular ellipses is larger than or equal to alpha and larger than beta, the ellipse eccentricity close to the axis of the main shaft 210 is larger, the ellipse is flatter, the ellipse eccentricity far away from the axis of the main shaft 210 is smaller, the ellipse approaches to a circle, correspondingly, the eccentric shaft 220 comprises a first semicircular part 221 close to the axis of the main shaft 210 and a second semicircular part 222 far away from the axis of the main shaft 210, compared with the eccentric shaft 220 with a right circular cross section, when the rotating stroke is the same, the ratio of the short axis beta to the length of the main diameter alpha is smaller, the first semicircular part 221 can drive the moving part 400 to linearly move for a larger distance, the space required by the operation of a transmission mechanism is further saved, and when the eccentric shaft 220 rotates by 0-90 degrees around any one needle of the main shaft 210 in the radial direction of the widest width direction of the closed circular cross section, the moving part 400 is the largest in the vertical direction.

Meanwhile, compared with the cliff cam design in the related art, the eccentric shaft 220 with the oval cross section has the advantages of low noise, smooth movement process, high flexibility and better use experience.

In other embodiments, a plane 4111a may be further disposed at the abutting position of the eccentric shaft 220 and the moving component 400 at a fixed angle, the area of the plane 4111a is as small as possible, and the plane 4111a and other parts of the eccentric shaft 220 are in transition through an arc surface, so that the use experience of the eccentric shaft 220 during movement and rest is further improved.

Further, the moving part 400 is provided with a transmission hole 411, and the eccentric shaft 220 is penetrated in the transmission hole 411; the side wall of the driving hole 411 is provided with a clamping portion 4111 matched with the eccentric shaft 220.

Specifically, in this embodiment, as shown in fig. 4, a transmission hole 411 matching with the eccentric shaft 220 is provided on the transmission member 410 of the moving member 400, a clamping portion 4111 matching with the semicircular portion is provided on a side wall of the transmission hole 411 opposite to the semicircular portion after the semicircular portion rotates 90 ° around the spindle 210 in a time needle direction, the clamping portion 4111 protrudes from an inner wall of the transmission hole 411 away from the direction of the pressing protrusion 420, the clamping portion 4111 includes a plane 4111a and an arc-shaped transition surface 4111b224 connected from the plane 4111a to an inner wall of an adjacent transmission hole 411, the plane 4111a extends toward the direction of the pressing protrusion 420 and is perpendicular to the inner wall of the transmission hole 411, and a cross section of the transition surface 224 perpendicular to the rotation axis direction of the transmission member 200 is arc-shaped.

The locking portion 4111 serves to limit the rotation stroke of the transmission member 200, and the locking portion 4111 protruding downward from the top of the transmission hole 411 can increase the lifting distance of the moving member 400 after rotating for the same stroke, so that the labor and the space are saved, the volume of the transmission mechanism is reduced, and the device is better applied to electronic equipment.

Further, as shown in fig. 1 and 6, the driving part 200 further includes a fixing piece 230 connected between the main shaft 210 and the eccentric shaft 220, and a transition surface 224 tapered in a length extending direction is formed between the eccentric shaft 220 and the fixing piece 230. The transition surface 224 is used for providing a smooth interface between the fixing piece 230 and the eccentric shaft 220, so that noise generated when the eccentric transmission mechanism 10 moves is reduced, and further, the use experience of the eccentric transmission mechanism 10 is improved, so that the use experience of the eccentric transmission mechanism is more in line with the application scene of the electronic equipment.

Further, as shown in fig. 1, the fixing piece 230 includes a first fixing piece 231, a second fixing piece 232, and a third fixing piece 233 sequentially disposed toward the extension direction of the main shaft 210;

the main shaft 210 and the eccentric shaft 220 are integrally formed at the first fixing piece 231, the second fixing piece 232 is fixedly connected to the first fixing piece 231 and rotatably connected to the third fixing piece 233, and the third fixing piece 233 is fixedly connected to the base 100. The arrangement can limit the mobility of the transmission component 200 along the direction of the main shaft 210, and fix the transmission component 200 on the base body 100, so as to ensure that the transmission component 200 stably rotates, thereby enabling the transmission component 200 to reach the maximum moving distance in the shortest rotating stroke, reducing the occupied volume of the transmission mechanism, saving manufacturing materials, reducing cost and being better applied to the field of electronic equipment.

The second fixing piece 232 is made of an insulating material, and preferably, the second fixing piece 232 is made of rubber or other high-elastic polymer materials. In this embodiment, the second fixing piece 232 is made of rubber, on the one hand, the third fixing piece 233 is rotationally connected with the second fixing piece 232, the second fixing piece 232 is made of rubber, and the wear-resisting property of rubber is utilized, so that the third fixing piece 233 and the second fixing piece 232 are prevented from being made of metal, and the friction wear between them is large; on the other hand, static electricity and sparks generated during friction between the third fixing piece 233 and the second fixing piece 232 are also avoided.

Preferably, the eccentric transmission mechanism 10 further includes a limiting member 500 rotatably connected to the base 100, the limiting member 500 is provided with a limiting groove 5241, and the eccentric shaft 220 includes a body and a limiting portion 223 penetrating the limiting groove 5241, which are sequentially connected in a direction away from the main shaft 210.

Specifically, in this embodiment, as shown in fig. 5, the top cover 110 of the base 100 is recessed into the accommodating cavity to form the mounting groove 112, the mounting groove 112 is provided with a mounting hole 1121 matching with the stopper 500, and the base 100 further includes a dust cover 113 matching with the mounting groove 112 and detachably connected in the mounting groove 112.

The stopper 500 includes a fixed portion 510 fixedly coupled to the base 100, a movable portion 520 rotatably coupled to the fixed portion 510, and a key 530 coupled to the movable portion 520.

The fixing part 510 comprises a first fixing drum 511, a fixing nut 512, a second fixing drum 513 and a fixing pin 514, wherein the first fixing drum 511 is penetrated in the mounting hole 1121, the fixing nut 512 is spirally sleeved on the drum wall of the first fixing drum 511 in the accommodating cavity, the second fixing drum 513 is penetrated in the first fixing drum 511, a pin hole matched with the fixing pin 514 is formed in the position, corresponding to the second fixing drum 513, of the first fixing drum 511, and the fixing pin 514 is penetrated in the pin hole and is detachably connected with the second fixing drum 513. In this manner, the fixing portion 510 is fixed to the base 100. Preferably, one end of the first fixing cylinder 511 is provided with a fixing cover 5111.

The movable portion 520 includes a fixed post 521, at least one positioning post 522, a connecting arm 523, and a stopper 524.

The fixed column 521 comprises a first fixed column 5211, a second fixed column 5212 and a third fixed column 5213 which are sequentially connected from the top cover 110 to the second fixed drum 513;

the first fixing column 5211 is penetrated through the mounting hole 1121, and the first fixing column 5211 is provided with a clamping groove matched with the key 530;

the second fixed column 5212 is positioned between the top cover 110 and the second fixed drum 513, the second fixed column 5212 is provided with at least one positioning hole along the length extending direction, and the positioning column 522 is penetrated in the positioning hole;

the third fixed column 5213 is arranged in the second fixed drum 513 in a penetrating manner, one end of the connecting arm 523 is abutted against the end part, far away from the top cover 110, of the first fixed drum 511 and is connected with the third fixed column 5213 through screws, the other end of the connecting arm 523 is integrally connected with the limiting block 524, and the limiting block 524 is provided with a limiting groove 5241.

As an example, the second fixing post 5212 is provided with four positioning holes, and one positioning post 522 is correspondingly provided.

The fixed cover 5111 and the first fixed barrel 511 are clamped in the mounting groove 112, and the key 530 is used for penetrating into the fixed cover 5111 to abut against the positioning post 522. When the key 530 is inserted, the positioning post 522 abuts against the bottom of the positioning hole to prevent the key 530 from being inserted further, and the whole movable portion 520 can rotate around the axis of the first fixed cylinder 511 by rotating the key 530, so that the limit groove 5241 of the movable portion 520 is far away from the limit portion 223 of the eccentric shaft 220 or is sleeved on the limit portion 223 of the eccentric shaft 220.

The limiting part 223 and the corresponding limiting piece 500 can lock the eccentric transmission mechanism 10, limit the rotation of the transmission component 200 when the eccentric transmission mechanism 10 does not move, further limit the linear movement of the moving component 400, and meet the locking function of the transmission mechanism in the application of the electronic equipment with a simplified structure, so that the occupied space is small, and the whole material of the transmission mechanism is saved.

Further, two adjacent sides of the limiting portion 223, which are close to the limiting groove 5241, are abutted against the inner wall of the corresponding limiting groove 5241.

Specifically, in the present embodiment, as shown in fig. 4, the limiting portion 223 is provided with chamfers near the edges of the adjacent two side walls of the limiting groove 5241. The limiting part 223 is abutted against the inner wall of the limiting groove 5241, so that the rotation of the transmission part 200 can be limited, and the locking function of the eccentric transmission mechanism 10 in the electronic equipment application is further satisfied.

Further, as shown in fig. 4, the limiting portion 223 is projected in the body along the axial direction of the spindle 210, and the body abuts against the surface of the limiting member 500 facing the spindle 210. The arrangement can limit the axial movement of the main shaft 210, further limit the mobility of the transmission component 200 in the three-dimensional direction, so as to ensure the stable rotation of the transmission component 200, avoid the labor-consuming phenomenon caused by the eccentricity of the transmission component 200, and further ensure that the transmission component 200 can lead the moving component 400 to reach the maximum moving distance in the shortest rotating stroke, reduce the occupied volume of the transmission mechanism, save the manufacturing materials and reduce the cost, and be better applied to the field of electronic equipment.

Further, one end of the main shaft 210 extends out of the base 100 and is fixedly connected to the triggering member 300. The end of the main shaft 210 near the trigger part 300 is outwardly protruded with a plurality of fixing blocks 211, and the trigger part 300 is provided with fixing grooves 311 matched with the fixing blocks 211.

Specifically, in this embodiment, as shown in fig. 1 and 5, the triggering component 300 includes a handle 310 and a spacer 320, the spacer 320 is coaxially provided with a spindle opening matched with the spindle 210, the spacer 320 is disposed between the handle 310 and the front shell 120 of the base 100, the spindle 210 sequentially passes through the spindle opening of the base plate and the spacer 320 and is spirally fixed at one end of the handle 310, the handle 310 is provided with a fixing slot 311 matched with the fixing block 211, and the fixing block 211 is inserted into the fixing slot 311. The use of the trigger member 300 with one end connected to the main shaft 210 can better save the force of the user for driving the eccentric transmission mechanism 10, and the fixing block 211 and the fixing groove 311 can enable the main shaft 210 to be positioned on the trigger member 300 better and more accurately, so that the change of the included angle between the trigger member 300 and the main shaft 210 is avoided, and the optimal transmission performance can be maintained.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. An eccentric transmission mechanism is characterized by comprising a base body, a transmission part rotationally connected with the base body, a trigger part connected with the transmission part and a moving part connected with the base body;

2. The eccentric transmission mechanism as claimed in claim 1, wherein the outer profile of the cross section of the eccentric shaft perpendicular to the axial direction thereof is a closed ring shape with smooth edges, and the widest width direction of the cross section is perpendicular to the radial direction of the main shaft.

3. The eccentric transmission mechanism according to claim 1, wherein the moving part is provided with a transmission hole, and the eccentric shaft is inserted into the transmission hole; and the side wall of the transmission hole is provided with a clamping part matched with the eccentric shaft.

4. The eccentric transmission mechanism of claim 1, wherein the transmission member further comprises a fixing piece connected between the main shaft and the eccentric shaft, and a transition surface tapered along the length extension direction is formed between the eccentric shaft and the fixing piece.

5. The eccentric transmission mechanism as claimed in claim 4, wherein the fixing pieces include a first fixing piece, a second fixing piece and a third fixing piece which are sequentially provided toward the extending direction of the main shaft;

6. The eccentric transmission mechanism according to claim 1, further comprising a limiting member rotatably connected to the base body, wherein the limiting member is provided with a limiting groove, and the eccentric shaft comprises a body and a limiting portion penetrating through the limiting groove, wherein the body is sequentially connected in a direction away from the main shaft.

7. The eccentric transmission mechanism of claim 6, wherein two adjacent sides of the limiting part, which are close to the limiting groove, are abutted against the inner wall of the corresponding limiting groove.

8. The eccentric transmission mechanism as claimed in claim 6, wherein the projection of the limiting portion along the axial direction of the main shaft is in the body, and the body abuts against the surface of the limiting member facing the main shaft.

9. The eccentric transmission mechanism of claim 1, wherein one end of the main shaft extends out of the base body and is fixedly connected to the trigger member.

10. The eccentric transmission mechanism of claim 9, wherein the end of the main shaft adjacent to the trigger member is outwardly protruded with a plurality of fixing blocks, and the trigger member is provided with fixing grooves matched with the fixing blocks.