CN220866287U

CN220866287U - Novel feeding mechanism with encoder feedback

Info

Publication number: CN220866287U
Application number: CN202322756306.7U
Authority: CN
Inventors: 汪爱华; 陈净; 朱海
Original assignee: Suzhou Zhongmo Mould Technology Co ltd
Current assignee: Suzhou Zhongmo Mould Technology Co ltd
Priority date: 2023-10-15
Filing date: 2023-10-15
Publication date: 2024-04-30
Anticipated expiration: 2033-10-15

Abstract

The utility model discloses a novel feeding mechanism with encoder feedback, which comprises a substrate, wherein a pinch roller mounting bracket is arranged on one side above the substrate, a driving roller mounting bracket is arranged on the opposite side above the substrate relative to the pinch roller mounting bracket, a pinch roller is arranged on the pinch roller mounting bracket, and a driving motor is arranged above the driving roller mounting bracket. Through rotating by motor drive gyro wheel, drive the material that compresses tightly on the gyro wheel and advance, install the encoder in drive roller one side, encoder counter wheel and material contact, rotate along with advancing of material, real-time recording and feed back to the PLC signal, PLC calculates the distance that the material advances, make instruction feedback again and give the pay-off motor, let the motor pay-off or stop, can reflect the material in time and advance the distance and control the material and advance the distance simultaneously, thereby realize the accurate feeding to section bar class material, the position can conveniently be adjusted about the encoder, accommodation is wider.

Description

Novel feeding mechanism with encoder feedback

Technical Field

The utility model relates to the field of section bar feeding devices, in particular to a novel feeding mechanism with encoder feedback.

Background

The section bar feeding device is used for conveying materials and is an indispensable device in section bar processing.

The feeding mechanism on the market at present mainly comprises a gear which walks on a rack to drive a feeder to walk, a clamp for clamping materials is arranged on a feeding frame to drive the clamped materials to move together, and in this way, for long-length and large-size sectional materials, a huge feeding frame is needed, and the whole feeding frame is very precise, high in cost, inconvenient to move, large in occupied space and inconvenient to use.

Disclosure of utility model

The utility model aims to provide a novel feeding mechanism with encoder feedback, which has the advantages of more compact structure, higher cost, more convenient use, wider adaptability, direct connection of a motor and a roller and more accurate feeding.

In order to achieve the above purpose, the specific technical scheme of the utility model is as follows: the utility model provides a novel take feeding mechanism of encoder feedback, includes the base plate, pinch roller installing support is installed to base plate top one side, the drive roller installing support is installed for pinch roller installing support contralateral to the base plate top, install the pinch roller on the pinch roller installing support, driving motor is installed to drive roller installing support top, the drive roller is installed to driving motor below, there is coupling joint between driving motor and the drive roller, the encoder support is installed to one side of drive roller installing support, install the encoder on the encoder support, the encoder includes the encoder main part, install the encoder gyro wheel in the encoder main part.

Preferably, the encoder support comprises an encoder support fixing part and an encoder support moving part, a through groove is formed in the encoder support fixing part, an encoder support moving part is arranged in the through groove, and the encoder is fixed on the encoder support moving part.

Preferably, the encoder support fixing part comprises a base, the base is fixedly connected with an encoder support fixing part body, a through groove is formed in the encoder support fixing part body, a threaded hole is formed in the inner wall of one side of the through groove, and a tightening plug screw is installed in the threaded hole.

Preferably, the encoder support movable part comprises a vertical movable block, the vertical movable block is movably arranged in a through groove of the encoder support fixed part body, a through hole is formed in the vertical movable block, a horizontal movable block is arranged in the through hole, a waist-shaped hole is formed in the horizontal movable block, an anti-falling pin is arranged in the waist-shaped hole, a round hole is formed in the vertical movable block, the anti-falling pin is fixed in the round hole, a handle is arranged on one side of the vertical movable block, and a spring is arranged between the handle and the horizontal movable block.

Preferably, one end of the horizontal movable block is fixed with a middle connecting block, the top of the middle connecting block is fixed with a temperature sensor fixing block, the lower side of the middle connecting block is fixed with an encoder fixing block, and a temperature sensor is arranged in the temperature sensor fixing block.

Preferably, the guide rail is installed on the base plate, install the slider on the guide rail, install the pinch roller installing support on the slider, the nut is installed to one side below the pinch roller installing support, the meshing of the nut is connected with the lead screw inside, base plate one side fixedly connected with second curb plate, the lead screw stretches out the second curb plate through the hole of second curb plate, the lead screw outside is fixed with the retaining ring, the hand wheel is installed to one end of lead screw.

Preferably, the pinch roller mounting bracket is divided into a pinch roller mounting bracket fixing part and a pinch roller mounting bracket movable part, the pinch roller mounting bracket fixing part comprises a fixing part bottom plate, a fixing part separating plate is arranged above one side of the fixing part bottom plate, a driving cylinder is arranged on one side of the fixing part separating plate, the pinch roller mounting bracket movable part comprises a movable part bottom plate, a movable part separating plate II is arranged above the movable part bottom plate, a movable part separating plate I is arranged above the movable part bottom plate, a movable part upper plate is arranged above the movable part separating plate II, and a piston rod of the driving cylinder is connected to the movable part separating plate I through a screw.

Preferably, a driving roller mounting bracket is mounted on the sliding block, a first side vertical plate is mounted on the other side of the base plate, and a tensioning screw and a jacking screw are arranged between the first side vertical plate and the driving roller mounting bracket.

Preferably, the driving roller mounting bracket comprises a driving roller outer bracket and a driving roller inner bracket, the driving roller inner bracket is fixed on the inner side of the driving roller outer bracket through screws, a speed reducer is fixed above the driving roller inner bracket, a driving motor is mounted above the speed reducer, and an output shaft of the speed reducer is connected with a shaft neck of the driving roller through a coupler.

Preferably, the driving roller inner support comprises a driving roller inner support upper plate, a driving roller inner support vertical plate is arranged on one side of the driving roller inner support upper plate, a driving roller inner support bottom plate is arranged below the driving roller inner support vertical plate, bearings are arranged in the driving roller inner support upper plate and the driving roller inner support bottom plate, and the driving roller can be connected with the driving roller inner support upper plate and the driving roller inner support bottom plate in a rolling way through the two bearings.

The novel feeding mechanism with encoder feedback has the following advantages:

This novel feeding mechanism with encoder feedback, through driving motor and the encoder of installation, the encoder feeds back the material in real time and advances the distance, feed back to PLC again, through program control, the rotation of the external driving motor of control again, form a closed loop, thereby obtain a feeding method of material feed distance accurately, because with the gyro wheel rotation drive material march, do not need the removal of pay-off frame, the pay-off part can be made very short, for long section bar, specific very obvious cost advantage, and convenient to use, take up an area of the advantage of the space little, etc. realize the accurate pay-off function to section bar processing, and during operation, by motor drive gyro wheel rotation, drive the material feed that compresses tightly on the gyro wheel, install the encoder in drive roller one side, encoder counter wheel and material contact, rotate along with the march of material, real-time recording and feed PLC signal, the distance that advances the material is calculated to PLC, make instruction feedback give the pay-off motor, let motor pay-off or stop, whole process is real-time, can reflect material feed distance in time and control the material feed motor simultaneously, thereby realize the accurate feed distance to the material feed motor, more compact, the realization is more accurate, the channel-section bar, the channel steel can be fed into, the position is more compact, the channel steel is more convenient, the channel steel can be moved down, the position is more directly, the device is convenient, the channel steel is more convenient, the device is fed, the more compact, the position is convenient, the device is realized, can be adjusted, the more is convenient, and can be moved, the more is convenient, the device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of a rail structure of the present utility model;

FIG. 3 is a schematic view of a driving roller structure according to the present utility model;

FIG. 4 is a schematic view of a vertical movable block structure according to the present utility model;

FIG. 5 is a schematic diagram of an encoder structure according to the present utility model;

FIG. 6 is a schematic view of the pinch roller mounting bracket of the present utility model;

FIG. 7 is a schematic cross-sectional view of a drive roller of the present utility model;

The figure indicates: 1. a substrate; 2. a pinch roller mounting bracket; 3. a pinch roller; 4. an encoder; 5. an encoder support; 6. a driving motor; 7. a drive roller mounting bracket; 8. a driving roller; 11. a guide rail; 12. a slide block; 13. tightening the screw; 14. tightly pushing the screw; 15. a first side riser; 16. a hand wheel; 17. a retainer ring; 18. a second side plate; 19. a screw rod; 21. a pinch roller mounting bracket fixing portion; 22. the pinch roller is arranged on the movable part of the bracket; 51. an encoder support movable portion; 52. an encoder bracket fixing portion; 41. an encoder body; 42. a temperature sensor; 43. an encoder wheel; 61. a speed reducer; 62. a coupling; 71. a drive roller outer bracket; 72 driving the roller inner support; 101. a nut; 211. fixing the partial separation plate; 212. a driving cylinder; 213. a fixed part bottom plate 221, a movable part bottom plate; 222. the movable part is a first plate; 223. the movable part is a second plate; 224. a movable part upper plate 511 and a temperature sensor fixed block; 512. a middle connecting block; 513. an encoder fixing block; 514. a horizontal movable block; 515. a vertical movable block; 516. anti-drop pins; 517. a spring; 518. a handle; 521. an encoder bracket fixing part body; 522. a base; 523. tightly pushing the screw plug; 751. an upper plate of the inner bracket of the driving roller; 752. a driving roller inner bracket vertical plate; 753. a bottom plate of the inner bracket of the driving roller; 754. and (3) a bearing.

Detailed Description

Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in numerous different ways without departing from the spirit or scope of the embodiments of the present utility model. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.

In the description of the embodiments of the present utility model, it should be understood that the terms "length," "vertical," "horizontal," "top," "bottom," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the embodiments of the present utility model and to simplify the description, rather than to indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of 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 embodiments of the present utility model, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

The following disclosure provides many different implementations, or examples, for implementing different configurations of embodiments of the utility model. In order to simplify the disclosure of embodiments of the present utility model, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the present utility model. Furthermore, embodiments of the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.

In order to better understand the purpose, structure and function of the present utility model, a novel feeding mechanism with encoder feedback of the present utility model will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 1-7, the novel feeding mechanism with encoder feedback comprises a substrate 1, wherein a pinch roller mounting bracket 2 is arranged on one side above the substrate 1, a driving roller mounting bracket 7 is arranged on the opposite side of the substrate 1 relative to the pinch roller mounting bracket 2, a pinch roller wheel 3 is arranged on the pinch roller mounting bracket 2, a driving motor 6 is arranged above the driving roller mounting bracket 7, a driving roller 8 can be effectively driven to rotate through the driving motor 6, so that material feeding is driven, the feeding mechanism is more convenient in use, the driving roller 8 is arranged below the driving motor 6, the driving motor 6 is connected with the driving roller 8 through a coupler 62, an encoder bracket 5 is arranged on one side of the driving roller mounting bracket 7, an encoder 4 is arranged on the encoder bracket 5, the encoder 4 comprises an encoder main body 41, an encoder roller 43 is arranged on the encoder main body 41, and the encoder counting wheel contained by the encoder roller can be converted into pulses of the encoder 4 through contact with the material, so that the accurate position of the material on a machine can be obtained, after the material reaches a certain distance, the driving motor is more convenient in use, the feeding mechanism is controlled to perform a material feeding function, and the feeding function is better in order of controlling the feeding mechanism, and the feeding mechanism is realized.

The encoder support 5 includes encoder support fixed part 52 and encoder support movable part 51, has offered logical groove in the encoder support fixed part 52, has installed encoder support movable part 51 in the logical inslot, and encoder 4 is fixed on encoder support movable part 51, through the encoder support 5 that is equipped with, is convenient for install encoder 4 more, and is more stable during the use.

The encoder support fixing part 52 comprises a base 522, the base 522 is fixedly connected with an encoder support fixing part body 521, a through groove is formed in the encoder support fixing part body 521, a threaded hole is formed in the inner wall of one side of the through groove, a tightening screw plug 523 is installed in the threaded hole, and the encoder support fixing part 52 can be stably installed through the base 522.

The encoder support movable part 51 comprises a vertical movable block 515, the vertical movable block 515 is movably arranged in a through groove of the encoder support fixed part body 521, a through hole is formed in the vertical movable block 515, a horizontal movable block 514 is arranged in the through hole, a waist-shaped hole is formed in the horizontal movable block 514, an anti-drop pin 516 is arranged in the waist-shaped hole, a round hole is formed in the vertical movable block 515, the anti-drop pin 516 is fixed in the round hole, a handle 518 is arranged on one side of the vertical movable block 515, a spring 517 is arranged between the handle 518 and the horizontal movable block 514, and the position of the encoder 4 can be adjusted through the encoder support movable part 51.

One end of the horizontal movable block 514 is fixed with a middle connecting block 512, the top of the middle connecting block 512 is fixed with a temperature sensor fixing block 511, the lower side of the middle connecting block 512 is fixed with an encoder fixing block 513, a temperature sensor 42 is installed inside the temperature sensor fixing block 511, and through the temperature sensor 42, calculation errors of section bar feeding distances caused by changes of the diameter of an encoder counting wheel due to thermal expansion and contraction caused by temperature changes can be effectively reduced.

The guide rail 11 is installed on the base plate 1, the slider 12 is installed on the guide rail 11, the pinch roller mounting bracket 2 is installed on the slider 12, the nut 101 is installed on one side below the pinch roller mounting bracket 2, the screw rod 19 is connected with in an engaged mode, the second side plate 18 is fixedly connected to one side of the base plate 1, the screw rod 19 stretches out of the second side plate 18 through a hole of the second side plate 18, the retainer ring 17 is fixedly arranged outside the screw rod 19, the hand wheel 16 is installed at one end of the screw rod 19, and the position movement of the pinch roller mounting bracket 2 can be adjusted through the hand wheel 16, so that the position of the pinch roller 3 is adjusted, and the use is more convenient.

The pinch roller installing support 2 is divided into a pinch roller installing support fixed part 21 and a pinch roller installing support movable part 22, the pinch roller installing support fixed part 21 comprises a fixed part bottom plate 213, a fixed part separating plate 211 is installed above one side of the fixed part bottom plate 213, a driving cylinder 212 is installed on one side of the fixed part separating plate 211, the pinch roller installing support movable part 22 comprises a movable part bottom plate 221, a movable part separating plate II 223 is installed above the movable part bottom plate 221, a movable part separating plate I222 is installed above the movable part separating plate II 223, a movable part upper plate 224 is installed above the driving cylinder 212, a piston rod of the driving cylinder 212 is connected to the movable part separating plate I222 through screws, and the pinch roller installing support 2 can be used for effectively installing a pinch roller 3 and controlling the position of the pinch roller 3.

The driving roller mounting bracket 7 is arranged on the sliding block 12, the first side vertical plate 15 is arranged on the other side of the base plate 1, the tensioning screw 13 and the jacking screw 14 are arranged between the first side vertical plate 15 and the driving roller mounting bracket 7, and the pressing roller mounting bracket 2 can slide on the guide rail 11 through the sliding block 12, so that the moving is more convenient.

The drive roller installing support 7 includes drive roller outer support 71 and drive roller inner support 72, and drive roller inner support 72 passes through the screw fixation at the drive roller outer support 71 inboard, and drive roller inner support 72 top is fixed with reduction gear 61, and driving motor 6 is installed to the reduction gear 61 top, and the reduction gear 61 output shaft passes through shaft coupling 62 and drive roller 8 journal connection, through the drive roller outer support 71 that is equipped with, installation reduction gear 61 that can be stable, and is more stable during the use.

The driving roller inner bracket 72 comprises a driving roller inner bracket upper plate 751, a driving roller inner bracket vertical plate 752 is arranged on one side of the driving roller inner bracket upper plate 751, a driving roller inner bracket bottom plate 753 is arranged below the driving roller inner bracket vertical plate 752, bearings 754 are arranged in the driving roller inner bracket upper plate 751 and the driving roller inner bracket bottom plate 753, the driving roller 8 is in rolling connection with the driving roller inner bracket upper plate 751 and the driving roller inner bracket bottom plate 753 through the two bearings 754, and the driving roller 8 can be stably arranged through the driving roller inner bracket 72, so that the driving roller 8 is more stable.

The novel feeding mechanism with encoder feedback operates according to the following principle: when the novel feeding mechanism with encoder feedback is applied, firstly, material is placed between the driving roller 8 and the compression roller 3, the hand wheel 16 is rocked to drive the screw rod 19 to rotate according to the width of the material, thereby moving the position of the compression roller mounting bracket 2, the compression roller mounting bracket 2 drives the compression roller 3 mounted on the compression roller mounting bracket to move, the compression roller 3 is close to the side surface of the material, the driving roller 8 is driven to rotate by the driving motor 6 through the speed reducer 61, the driving cylinder 212 in the compression roller mounting bracket 2 drives the compression roller 3 to be close to the material, the material is compressed on the driving roller 8, when the driving roller 8 rotates, the material can be driven to move along the horizontal direction of the rotation of the driving roller 8, the encoder 4 is mounted on one side of the compression roller 3, the encoder counting wheel contained in the encoder counting wheel contacts with the side surface of the material, the encoder counting wheel rotates along with the movement of the contact surface, the distance of the section bar is converted into a pulse signal of the encoder 4 in real time, the PLC is designed and a program is good, various calculations are carried out in the PLC, the inside, the diameter of the encoder wheel and the pulse motor is driven by the driving motor, the diameter of the encoder counting wheel and the pulse motor are accurately calculated, and the diameter of the material can be accurately calculated by the temperature sensor when the temperature sensor is accurately calculated, the diameter of the material is required to be accurately calculated, and the diameter of the material can be accurately calculated, and the diameter is accurately calculated by the temperature sensor is accurately when the diameter of the material is required to be fed by the material by the temperature sensor, and the temperature sensor is accurately when the temperature sensor is measured, and the temperature sensor is accurately, and the diameter is measured.

It will be understood that the utility model has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims

1. Novel take feeding mechanism of encoder feedback, including base plate (1), its characterized in that: the utility model discloses a high-precision encoder, including base plate (1), pinch roller installing support (2) are installed to base plate (1) top one side, drive roller installing support (7) are installed for pinch roller installing support (2) contralateral, install pinch roller (3) on pinch roller installing support (2), driving motor (6) are installed to drive roller installing support (7) top, driving roller (8) are installed to driving motor (6) below, be connected with shaft coupling (62) between driving motor (6) and driving roller (8), encoder support (5) are installed to one side of driving roller installing support (7), install encoder (4) on encoder support (5), encoder (4) are including encoder main part (41), install encoder gyro wheel (43) on encoder main part (41).

2. The novel feed mechanism with encoder feedback of claim 1, wherein: the encoder support (5) comprises an encoder support fixing part (52) and an encoder support movable part (51), a through groove is formed in the encoder support fixing part (52), the encoder support movable part (51) is installed in the through groove, and the encoder (4) is fixed on the encoder support movable part (51).

3. The novel feed mechanism with encoder feedback of claim 2, wherein: the encoder support fixing part (52) comprises a base (522), the base (522) is fixedly connected with an encoder support fixing part body (521), a through groove is formed in the encoder support fixing part body (521), a threaded hole is formed in the inner wall of one side of the through groove, and a tightening plug screw (523) is installed in the threaded hole.

4. The novel feed mechanism with encoder feedback of claim 2, wherein: the encoder support movable part (51) comprises a vertical movable block (515), the vertical movable block (515) is movably arranged in a through groove of the encoder support fixed part body (521), a through hole is formed in the vertical movable block (515), a horizontal movable block (514) is arranged in the through hole, a waist-shaped hole is formed in the horizontal movable block (514), an anti-falling pin (516) is arranged in the waist-shaped hole, a round hole is formed in the vertical movable block (515), the anti-falling pin (516) is fixed in the round hole, a handle (518) is arranged on one side of the vertical movable block (515), and a spring (517) is arranged between the handle (518) and the horizontal movable block (514).

5. The novel feed mechanism with encoder feedback of claim 4, wherein: the horizontal movable block (514) one end is fixed with middle connecting block (512), middle connecting block (512) top is fixed with temperature sensor fixed block (511), middle connecting block (512) downside is fixed with encoder fixed block (513), temperature sensor (42) are installed to temperature sensor fixed block (511) the inside.

6. The novel feed mechanism with encoder feedback of claim 1, wherein: install guide rail (11) on base plate (1), install slider (12) on guide rail (11), install pinch roller installing support (2) on slider (12), nut (101) are installed to one side below pinch roller installing support (2), nut (101) the inside meshing is connected with lead screw (19), base plate (1) one side fixedly connected with second curb plate (18), lead screw (19) stretch out second curb plate (18) through the hole of second curb plate (18), lead screw (19) external fixation has retaining ring (17), hand wheel (16) are installed to one end of lead screw (19).

7. The novel feed mechanism with encoder feedback of claim 1, wherein: the utility model provides a pinch roller installing support (2) divide into pinch roller installing support fixed part (21) and pinch roller installing support movable part (22), pinch roller installing support fixed part (21) include fixed part bottom plate (213), fixed part separation board (211) are being installed to fixed part bottom plate (213) one side top, drive cylinder (212) are installed to fixed part separation board (211) one side, pinch roller installing support movable part (22) include movable part bottom plate (221), movable part separation board two (223) are installed to movable part bottom plate (221) top, movable part separation board one (222) are installed to movable part separation board two (223) top, the piston rod of drive cylinder (212) is connected to movable part separation board one (222) through the screw.

8. The novel feed mechanism with encoder feedback of claim 6, wherein: the novel driving roller is characterized in that a driving roller mounting bracket (7) is mounted on the sliding block (12), a first side vertical plate (15) is mounted on the other side of the base plate (1), and a tensioning screw (13) and a jacking screw (14) are arranged between the first side vertical plate (15) and the driving roller mounting bracket (7).

9. The novel feed mechanism with encoder feedback of claim 1, wherein: the driving roller mounting bracket (7) comprises a driving roller outer bracket (71) and a driving roller inner bracket (72), the driving roller inner bracket (72) is fixed on the inner side of the driving roller outer bracket (71) through screws, a speed reducer (61) is fixed above the driving roller inner bracket (72), a driving motor (6) is mounted above the speed reducer (61), and an output shaft of the speed reducer (61) is in shaft neck connection with the driving roller (8) through a coupler (62).

10. The novel feed mechanism with encoder feedback of claim 9, wherein: the inner support (72) of the driving roller comprises an inner support upper plate (751) of the driving roller, an inner support vertical plate (752) of the driving roller is arranged on one side of the inner support upper plate (751) of the driving roller, an inner support bottom plate (753) of the driving roller is arranged below the inner support vertical plate (752) of the driving roller, bearings (754) are arranged in the inner support upper plate (751) of the driving roller and the inner support bottom plate (753) of the driving roller, and the driving roller (8) is in rolling connection with the inner support upper plate (751) of the driving roller and the inner support bottom plate (753) of the driving roller through the two bearings (754).