CN220144646U

CN220144646U - Differential rotary cutter

Info

Publication number: CN220144646U
Application number: CN202321625930.7U
Authority: CN
Inventors: 罗海平
Original assignee: Shenzhen Haisheng Automation Equipment Co ltd
Current assignee: Shenzhen Haisheng Automation Equipment Co ltd
Priority date: 2023-06-25
Filing date: 2023-06-25
Publication date: 2023-12-08
Anticipated expiration: 2033-06-25

Abstract

The utility model provides a differential rotary cutter which comprises a frame, a driving disc, a mounting disc, a cutter assembly, a first driving mechanism, a second driving mechanism and a control mechanism, wherein the driving disc is arranged on the frame, the mounting disc and the driving disc are coaxially arranged, the cutter assembly is arranged between the driving disc and the mounting disc, the first driving mechanism is in transmission connection with the driving disc, the second driving mechanism is in transmission connection with the mounting disc, and the control mechanism controls the first driving mechanism and the second driving mechanism to respectively drive the driving disc and the mounting disc to rotate at a preset speed in the same direction so as to drive the cutter assembly to slide towards or away from the axis. The differential rotary cutter provided by the utility model is simple and reasonable in layout and convenient to control, and rotary cutting and peeling of the cable are realized in a differential control mode.

Description

Differential rotary cutter

[ field of technology ]

The utility model relates to the technical field of cable rotary cutting devices, in particular to a differential rotary cutter.

[ background Art ]

In the cable processing industry, in order to realize connection between cables or to arrange a joint at one end of the cables, the outer skin of the end of the cable needs to be peeled off, and related cutting processes are quite common. In the prior art, the cutting and peeling of the cable are convenient and labor-saving, the processing efficiency is improved, the opening and closing of the cutter are realized by utilizing the differential principle, so that the cutting and peeling of the cable are realized, and the cutter is driven by a motor to rotate at a high speed, so that the effective cutting and peeling are realized. However, in the prior art, the differential is complicated in design, high in cost and unfavorable for control.

In the chinese patent literature, patent application number 2022109724376 discloses a cable rotary cutting device with a differential speed adjusting mechanism, the device mainly realizes speed change between a driving disc and a mounting disc through movement of an adjusting rod, control of the adjusting rod is complex, and when the adjusting rod is worn, broken or otherwise failed, differential speed rotation is easy to deviate; once the equipment fails, the problems of the driving mechanism or the differential speed adjusting mechanism cannot be determined, and the equipment is very difficult to check; the device is not accurate enough to the control of speed, and the effect of adjusting the pole can only realize fixed speed difference between driving disk and the mounting disc, can't realize more accurate control, to the cable of equidimension, need control differential rotatory difference and holding time, otherwise the cutter can't cut the shell as required, very easily cuts off the cable or can't complete cutting shell.

[ utility model ]

The utility model provides a differential rotary cutter for solving the problems, which has the technical problems of complex structure, inconvenience for production and maintenance, low control precision and the like.

The utility model provides a differential rotary cutter, includes frame, driving disc, mounting disc, cutter unit spare, first actuating mechanism, second actuating mechanism and control mechanism, the driving disc is located the frame, the mounting disc with the coaxial heart setting of driving disc, cutter unit spare activity is located the mounting disc and with the driving disc butt, first actuating mechanism with the driving disc transmission is connected, second actuating mechanism with the mounting disc transmission is connected, control mechanism control first actuating mechanism with second actuating mechanism drives respectively the driving disc with the mounting disc syntropy is with predetermined speed rotary motion, drives cutter unit spare orientation or keep away from the axle center direction slides.

Compared with the prior art, the differential rotary cutter provided by the utility model has the advantages that the first driving mechanism and the second driving mechanism respectively realize the same-direction rotation motion of the driving disc and the mounting disc at a preset speed, and drive the cutter assembly to slide towards or away from the axis direction, so that the cutting and stripping of the cable are realized. The device has simple structure, eliminates the transmission mode through the adjusting rod or other connecting pieces, directly controls the driving disc and the mounting disc, and has simple structure and reasonable layout; according to the device, the control mechanism drives the driving disc and the mounting disc to rotate in the same direction and at the same speed or at different speeds through the first driving mechanism and the second driving mechanism, so that the control is more convenient, other connecting pieces are not needed for transmission, and the rotation speed is directly controlled through the control mechanism, so that the control is more accurate; because of accurate control, for cables with different sizes, only parameters of the control mechanism need to be adjusted during processing, and the adjustment is more convenient; the device simple structure, it is comparatively convenient in the dismouting, do benefit to use, maintenance.

[ description of the drawings ]

For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

FIG. 1 is a schematic view of a three-dimensional assembly structure of a differential rotary cutter according to the present utility model;

FIG. 2 is an exploded perspective view of a portion of the differential rotary cutter shown in FIG. 1;

FIG. 3 is a schematic view of the drive disk of FIG. 1;

FIG. 4 is a schematic view of the mounting plate of FIG. 1;

FIG. 5 is a schematic view of the differential rotary cutter of FIG. 1 in a first working state; and

Fig. 6 is a schematic view of the differential rotary cutter shown in fig. 1 in a second working state.

[ detailed description ] of the utility model

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 in combination, fig. 1 is a schematic view of a three-dimensional assembly structure of a differential rotary cutter according to the present utility model. The differential rotary cutting machine 100 includes a frame 11, a driving plate 12, a mounting plate 13, a cutter assembly 14, a first driving mechanism 15, a second driving mechanism 16, a control mechanism (not shown), and a cover plate 18. The driving disc 12 is arranged on the frame 11, the mounting disc 13 and the driving disc 12 are coaxially arranged, the cutter assembly 14 is movably arranged on the mounting disc 13 and is abutted to the driving disc 12, the first driving mechanism 15 is in transmission connection with the driving disc 12, the second driving mechanism 16 is in transmission connection with the mounting disc 13, and the control mechanism controls the first driving mechanism 15 and the second driving mechanism 16 to respectively drive the driving disc 12 and the mounting disc 13 to rotate at a preset speed in the same direction so as to drive the cutter assembly 14 to slide towards or away from the axis direction.

The cover plate 18 is fixedly arranged on the surface of one side of the mounting plate 13 away from the driving plate 12, and is used for shielding and limiting the cutter assembly 14. The cover plate 18 is close to one side of the mounting plate 13, and is provided with a groove or a bulge corresponding to the cutter assembly 14, so that the cutter assembly 14 and the mounting plate 13 can be shielded, the whole device is attractive, the cutter assembly 14 can be limited, the cutter assembly 14 is prevented from exceeding the movement range in the processing process, the cable to be processed is damaged, and the safety of operators is protected.

The first driving mechanism 15 includes a first driving motor 151, a first driving wheel 153, and a first driving belt 155, where the first driving motor 151 is disposed on the frame 11, one end of the first driving motor is connected to the first driving wheel 153, and two ends of the first driving belt 155 are respectively connected to the first driving wheel 153 and the driving disc 12; the second driving mechanism 16 includes a second driving motor 161, a second driving wheel 163, and a second driving belt 165, where the second driving motor 161 is disposed on the frame 11, and one end of the second driving motor is connected to the second driving wheel 163, and two ends of the second driving belt 165 are respectively connected to the second driving wheel 163 and the mounting plate 13.

The first driving mechanism 15 and the second driving mechanism 16 are respectively and electrically connected with the control mechanism, and are independently controlled by the control mechanism, so that the same-speed or differential rotation in the same direction of the driving disc 12 and the mounting disc 13 is realized. The mode saves adjusting rods or other intermediate transmission links, controls the rotation speed of the driving disc 12 and the mounting disc 13 more accurately, and has simple structure and convenient installation. If faults occur, the test processing can be independently carried out, so that the time is saved, and the production efficiency is improved.

Referring to fig. 2, 3 and 4, fig. 2 is a perspective exploded view of a portion of the differential rotary cutter shown in fig. 1, fig. 3 is a schematic view of a driving disc shown in fig. 1, and fig. 4 is a schematic view of a mounting disc shown in fig. 1.

In this embodiment, the driving disc 12 further includes a first gear ring 121, the mounting disc 13 further includes a second gear ring 131, the first gear ring 121 and the second gear ring 131 are respectively disposed on the sides of the driving disc 12 and the mounting disc 13, which are far away from one end of the shaft center, the first gear ring 121 is connected with the first driving belt 155, and the second gear ring 131 is connected with the second driving belt 165. Of course, the driving disk 12 and the mounting disk 13 may be connected to the first belt 155 and the second belt 165 by another structure. In another embodiment, the first gear ring 121 and the driving disc 12 may be separately disposed, and the second gear ring 131 and the mounting disc 13 may be separately disposed, and connected and fixed by a fastening structure or a screw, etc., so as to achieve synchronous rotation. In this embodiment, the first gear ring 121 and the driving disc 12 are integrally formed, and the second gear ring 131 and the mounting disc 13 are integrally formed, so that the overall transmission effect is good, and the device is not easy to damage and has no error.

According to fig. 2, the cutter assembly 14 includes a plurality of cutter heads 141, a plurality of fixing members 143, a plurality of first connecting arms 145, a plurality of second connecting arms 147, and a plurality of sliders 149, wherein one of the cutter heads 141 is correspondingly provided with one of the fixing members 143, one of the first connecting arms 145, and one of the second connecting arms 147, the first connecting arms 145, the fixing members 143, the cutter heads 141, and the second connecting arms 147 are sequentially stacked on the sliding groove, and the sliders 149 are fixedly clamped between the first connecting arms 145 and the second connecting arms 147 corresponding to adjacent cutter heads 141.

In this embodiment, the cutter head 141, the fixing member 143, the first connecting arm 145, and the second connecting arm 147 are respectively provided with a through hole, and are connected by a mating and locking structure. The first connecting arm 145 and the cutter head 141 are relatively fixed by a clamping structure, and a notch is formed at a contact end of the cutter head 141 and the second connecting arm 147 and is movably connected by the clamping structure. When the slider 149 drives the first connecting arm 145 and the second connecting arm 147 to move, the cutter head 141 moves along with the first connecting arm 145 and slides relative to the second connecting arm 147.

The structural design of the cutter assembly 14 is very simple and reasonable, the position of the cutter head 141 is determined only by the fixing piece 143, the first connecting arm 145 and the second connecting arm 147 without complex connecting parts, the moving track of the cutter head 141 is reasonable in the transmission process, the stress is uniform, the cutting and stripping of cables can be well realized, and the cutter head 141 is very convenient to replace.

In other embodiments, the tool bit 141, the fixing member 143, the first connecting arm 145 and the second connecting arm 147 may be driven by other manners or structural changes, such as a gear structure or a bearing connection, which are not limited herein.

Further, as shown in fig. 3, the driving disc 12 includes a first through hole 123 and a plurality of arc-shaped grooves 125, and the first through hole 123 is located at the center of the driving disc 12 and penetrates through the driving disc 12; the arc-shaped groove 125 is disposed on a surface of the mounting plate 13, and the arc-shaped groove 125 is an arc-shaped structure with gradually increasing distance from the position near the first through hole 123 to the outer edge of the driving plate 12. The arcuate slot 125 does not extend through the drive disk 12, but rather has a depth, the depth of the arcuate slot 125 corresponding to the size of the slider 149, ensuring that the slider 149 abuts the arcuate slot 125 such that the slider 149 can slide back and forth along the arcuate slot 125 without obstruction.

As shown in fig. 4, the mounting plate 13 includes a second through hole 133, a plurality of sliding grooves 135 and a plurality of sliding holes 137, wherein the second through hole 133 is located at the center of the mounting plate 13 and penetrates through the mounting plate 13; the sliding groove 135 is arranged on the surface of the side, away from the driving disc 12, of the mounting disc 13; the sliding hole 137 is disposed between the second through hole 133 and the outer edge of the mounting plate 13, and penetrates the mounting plate 13, and the sliding hole 137 is elongated and extends from the center of the mounting plate 13 to the outer edge.

The length of the sliding hole 137 is the difference between the distances between the two ends of the arc-shaped slot 125 and the axis, that is, the projection length of the arc-shaped slot 125 in any radial direction of the driving disk 12 is consistent with the length of the sliding hole 137. The first through hole 123 is coaxial with the second through hole 133, and the size of the first through hole 123 is larger than that of the second through hole 133.

The slide hole 137 is designed to limit the position of the slide block 149, and is matched with the arc slot 125 to limit the slide block 149 to a preset line, so that the slide block 149 cannot be separated from a moving line in the processing process, and the limit protection function is achieved.

The number of the sliding holes 137 and the arc-shaped grooves 125 corresponds to the number of the sliding blocks 149 one by one. In this embodiment, the number of the sliding holes 137, the arc-shaped grooves 125, and the sliding blocks 149 is 4, and the number of the cutter head 141, the fixing member 143, the first connecting arm 145, and the second connecting arm 147 is 4. Of course, the number of the components is not limited herein, and the number of the components is one-to-one corresponding to the number of the components for realizing rotary cutting.

In this embodiment, the slider 149 is preferably in a "cross" structure, one end of the slider 149 abuts against the arc-shaped slot 125, and the other end of the slider 149 penetrates through the sliding hole 137 and is connected to the sliding slot 135 in cooperation with the first connecting arm 145 and the second connecting arm 147, the first connecting arm 145 and the second connecting arm 147 are movably disposed on the sliding slot 135, and the slider 149 drives the first connecting arm 145 and the second connecting arm 147 to slide back and forth along the sliding slot 135 according to the relative speed change of the driving disc 12 and the mounting disc 13, thereby driving the cutter head 141 to slide toward or away from the axial center direction.

In another embodiment, the slider 149 may be configured to be conveniently limited, including "dry", "rich", "and" # ", etc., which are not described herein.

Referring to the above figures in combination with fig. 5 and 6, fig. 5 is a schematic view of a first working state of the differential rotary cutter shown in fig. 1, and fig. 6 is a schematic view of a second working state of the differential rotary cutter shown in fig. 1.

As shown in fig. 5, the first driving motor 151 and the second driving motor 161 respectively drive the driving disc 12 and the mounting disc 13 to rotate in the same direction at the predetermined speed. In this state, the rotation speeds of the driving disc 12 and the mounting disc 13 are the same, and the predetermined speed is a preset cutting and peeling rotation speed in the control mechanism and is set according to different cable materials to be processed. The position of the sliding block 149 relative to the driving disc 12 and the mounting disc 13 is unchanged, and the sliding block is positioned at one end of the arc-shaped groove 125 away from the axle center; the first connecting arm 145 and the second connecting arm 147 are located on the sliding groove 135, and the relative positions are unchanged; the tool bit 141 is also moved at the rotational speed along with the driving disk 12 and the mounting disk 13 in a state to be machined.

When the first driving motor 151 and the second driving motor 161 drive the driving disc 12 and the mounting disc 13 to perform differential rotation motion in the same direction, that is, change is performed according to the preset speed setting of the control mechanism, for example, the speed of the driving disc 12 is increased or the speed of the mounting disc 13 is decreased. The tool bit 141 is in a working state. As shown in fig. 6, a position at a certain point in this state is schematically shown. The rotation speed of the driving disc 12 is greater than that of the mounting disc 13, one end of the slider 149 slides along the arc-shaped slot 125 to the other end, and at the same time, the other end of the slider 149 moves along the sliding hole 137 near the axle center and drives the first connecting arm 145 and the second connecting arm 147 to slide along the sliding slot 135 toward the axle center, and the positions of the slider 149, the first connecting arm 145 and the second connecting arm 147 relative to the driving disc 12 and the mounting disc 13 change, and finally, the slider 149, the first connecting arm 145 and the second connecting arm 147 are positioned near one end of the arc-shaped slot 125 near the axle center. Of course, according to the different sizes of the cables to be processed, the control mechanism controls the relative position of the slider 149 by controlling the first driving mechanism 15 and the second driving mechanism 16, thereby controlling the position of the cutter head 141. I.e. the position of the slider 149 is not necessarily in the second state, but the final stripping range is determined according to the size of the cable to be processed, thereby determining the position of the slider 149 with respect to the arc-shaped slot 125 and the slide hole 137.

In addition, in order to facilitate the cutting and peeling process of the cable to be processed, the problem that the cable is bent and is difficult to cut and peel is avoided, the differential rotary cutter 100 can be provided with a clamping mechanism (not shown) in a matching manner, the clamping mechanism is arranged on the frame 11 and is close to the cover plate 18, and is used for assisting in fixing the cable to be processed, ensuring coaxial placement and processing, and stabilizing the position during processing.

The utility model is used for cutting and stripping cables to be processed, and the specific working principle is as follows:

the control mechanism is electrically connected with the first driving mechanism 15 and the second driving mechanism 16, and parameters in the control mechanism are set according to the size of the cable to be processed.

After the cables are stably arranged, starting equipment, wherein the control mechanism controls the first driving mechanism 15 to move at the preset speed, and the first driving wheel 153 and the first transmission belt 155 drive the driving disc 12 to rotate at the preset speed; at the same time, the control mechanism controls the second driving mechanism 16 to move at the predetermined speed, and the second driving wheel 163 and the second driving belt 165 drive the mounting plate 13 to rotate at the predetermined speed and rotate in the same direction as the driving plate 12. The cutter assembly 14 rotates with the drive disk 12 and the mounting disk 13, with the slider 149 position unchanged.

The first driving mechanism 15 and the second driving mechanism 16 are controlled by the control mechanism, and the transmission speeds of the first driving mechanism 15 and the second driving mechanism 16 are changed according to the preset speed setting, when the rotation speed of the driving disc 12 is greater than that of the mounting disc 13, one end of the slider 149 slides along the arc-shaped groove 125 toward the axial direction, and the other end moves along the sliding hole 137 toward the axial direction, and drives the first connecting arm 145 and the second connecting arm 147 to slide along the sliding groove 135. The tool bit 141 approaches the axis under the combined action of the first connecting arm 145, the second connecting arm 147 and the fixing member 143, that is, the tool bit 141 gradually approaches the cable to be processed while performing the rotation motion, and performs the rotary cutting.

After the cutter head 141 reaches the machining depth, the transmission speed is changed again by the preset speed in the control mechanism, the rotation speed of the driving disc 12 is smaller than that of the mounting disc 13, one end of the slider 149 is rapidly far away from the axle center along the arc-shaped groove 125, the other end of the slider 149 is far away from the axle center along the sliding hole 137, and simultaneously the first connecting arm 145 and the second connecting arm 147 are driven to slide along the sliding groove 135, and the cutter head 141 is far away from the machined cable.

When the slider 149 returns to the initial position, the rotational speed of the drive disk 12 is equal to the rotational speed of the mounting disk 13, the cutter assembly 14 returns to the ready-to-process state, the finished cable is removed, and the above steps are repeated.

The predetermined speed includes two parameter variations, namely, parameter control of the first driving mechanism 15 (parameter one) and the second driving mechanism 16 (parameter two), and is subjected to four links of processing, and is cycled back and forth. The first parameter is consistent with the second parameter in the stage of the link to be processed; the cutting and peeling stage is carried out, wherein the first parameter is gradually larger than the second parameter; the cutting and peeling stage is completed and the parameter I is gradually reduced relative to the parameter II until the parameter I is the same as the parameter II and is started to be smaller than the parameter II; when the slider 149 is gradually returned to the initial position and finally returned to the stage to be machined, the first parameter is gradually increased relative to the second parameter until the same.

Compared with the prior art, the differential rotary cutter 100 provided by the utility model realizes the same-direction rotation motion of the driving disc 12 and the mounting disc 13 at a preset speed through the first driving mechanism 15 and the second driving mechanism 16, drives the cutter assembly 14 to slide towards or away from the axis direction, and realizes the cutting and peeling of the cable. The device has simple structure, eliminates the transmission mode through an adjusting rod or other connecting pieces, directly controls the driving disc 12 and the mounting disc 13, and has simple structure and reasonable layout; the control mechanism drives the driving disc 12 and the mounting disc 13 to rotate at the same speed or at different speeds in the same direction through the first driving mechanism 15 and the second driving mechanism 16, so that the control is more convenient, and the rotation speed is directly controlled through the control mechanism without transmission of other connecting pieces, so that the control is more accurate; because of accurate control, for cables with different sizes, only parameters of the control mechanism need to be adjusted during processing, and the adjustment is more convenient; the device simple structure, it is comparatively convenient in the dismouting, do benefit to use, maintenance.

While the utility model has been described with respect to the above embodiments, it should be noted that modifications can be made by those skilled in the art without departing from the inventive concept, and these are all within the scope of the utility model.

Claims

1. A differential rotary cutting machine comprising a frame, characterized in that it further comprises:

the driving disc is arranged on the frame;

the mounting disc is arranged coaxially with the driving disc;

the cutter assembly is movably arranged on the mounting disc and is abutted against the driving disc;

the first driving mechanism is in transmission connection with the driving disc;

the second driving mechanism is in transmission connection with the mounting plate; and

The control mechanism controls the first driving mechanism and the second driving mechanism to respectively drive the driving disc and the mounting disc to rotate at a preset speed in the same direction so as to drive the cutter assembly to slide towards or away from the axis.

2. The differential rotary cutting machine according to claim 1, wherein the driving plate comprises a first through hole and a plurality of arc-shaped grooves, the first through hole being located at the center of the driving plate; the arc-shaped grooves are formed in the surface close to one side of the mounting plate, and the arc-shaped grooves are of arc-shaped structures gradually increasing in distance from the position close to the first through hole to the outer edge of the driving plate.

3. The differential rotary cutting machine according to claim 2, wherein the mounting plate comprises a second through hole, a plurality of sliding grooves and a plurality of sliding holes, the second through hole being located at the center of the mounting plate; the sliding groove is arranged on the surface of one side, far away from the driving disc, of the mounting disc; the sliding hole is arranged between the second through hole and the outer edge of the mounting plate and penetrates through the mounting plate, and is long-strip-shaped and extends from the center of the mounting plate to the outer edge.

4. The differential rotary cutting machine according to claim 3, wherein the lengths of the sliding holes are the difference between the distances between the two ends of the arc-shaped groove and the axis, and the number of the sliding holes corresponds to the arc-shaped groove one by one.

5. The differential rotary cutting machine according to claim 4, wherein the cutter assembly comprises a plurality of cutter heads, a plurality of fixing members, a plurality of first connecting arms, a plurality of second connecting arms and a plurality of sliders, one of the cutter heads is provided with one of the fixing members, one of the first connecting arms and one of the second connecting arms, the first connecting arms, the fixing members, the cutter heads and the second connecting arms are sequentially stacked on the sliding groove, and the slider fixing clips are arranged between the first connecting arms and the second connecting arms corresponding to adjacent cutter heads.

6. The differential rotary cutting machine according to claim 5, wherein the sliding block has a cross structure, one end of the sliding block is abutted to the arc-shaped groove, the other end of the sliding block penetrates through the sliding hole, the first connecting arm and the second connecting arm are matched to be connected with the sliding groove, the first connecting arm and the second connecting arm are movably arranged on the sliding groove, and the sliding block drives the first connecting arm and the second connecting arm to slide back and forth along the sliding groove direction according to the relative position change of the driving disc and the mounting disc, so that the cutter head is driven to slide towards or away from the axial direction.

7. The differential rotary cutting machine according to claim 5, wherein the number of the cutter bits is 4, and the number of the arc-shaped grooves, the slide holes and the slide blocks is identical to the number of the cutter bits.

8. The differential rotary cutting machine according to claim 1, further comprising a cover plate fixedly disposed on a side of the mounting plate remote from the driving plate for shielding and limiting the cutter assembly.

9. The differential rotary cutting machine according to claim 1, wherein the first driving mechanism comprises a first driving motor, a first driving wheel and a first transmission belt, the first driving motor is arranged on the frame, one end of the first driving motor is connected with the first driving wheel, and two ends of the first transmission belt are respectively connected with the first driving wheel and the driving disc; the second driving mechanism comprises a second driving motor, a second driving wheel and a second transmission belt, wherein the second driving motor is arranged on the frame, one end of the second driving motor is connected with the second driving wheel, and two ends of the second transmission belt are respectively connected with the second driving wheel and the mounting plate.

10. The differential rotary cutting machine according to claim 9, wherein the driving plate further comprises a first gear ring, the mounting plate further comprises a second gear ring, the first gear ring and the second gear ring are respectively disposed on the side surfaces of the driving plate and the mounting plate far away from one end of the shaft center, the first gear ring is connected with the first transmission belt, and the second gear ring is connected with the second transmission belt.