CN214348647U

CN214348647U - Roll changing device for metal strip processing line

Info

Publication number: CN214348647U
Application number: CN202120267471.4U
Authority: CN
Inventors: 朱欢; 刘自超; 林意越
Original assignee: Guangzhou Jinji Metal Manufacturing Co ltd
Current assignee: Guangzhou Jinji Metal Manufacturing Co ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-10-08
Anticipated expiration: 2031-01-29

Abstract

The utility model discloses a roll change device for metal strip processing line, which comprises a frame, locate the drive roll group in the frame, locate the slide mechanism of frame one side and locate the roll change mechanism of the relative frame one side of slide mechanism, the drive roll group includes the relative transfer roller that sets up about two, the cover is equipped with first roller on the transfer roller, slide mechanism is used for exposing one end with the transfer roller from the frame, roll change mechanism includes the cylinder, a plurality of deflector rolls and the cover that are the circumference and distribute on the cylinder establish the second roller on one of them deflector roll, deflector roll and second roller can be rotatory around cylinder axial lead, be equipped with third drive assembly in the frame, be used for ordering about first roller and slide to on the deflector roll, be equipped with second drive assembly on the cylinder, in order to when second roller is rotatory to with the transfer roller centering, order about second roller and slide to on the transfer roller. The utility model discloses can change the roller after accomplishing the centering fast, it is efficient to change the roller.

Description

Roll changing device for metal strip processing line

Technical Field

The utility model relates to a roll change equipment field specifically relates to a roll change device for metal strip band processing line.

Background

In the process of processing the metal strip, the surface of a working roll on a rolling mill is gradually worn and consumed due to the fact that the working roll is in contact friction with the metal strip for a long time, when the surface of the working roll is worn to a certain degree, the processing quality, the processing efficiency and the like of a metal strip production line can be affected, and therefore the working roll is generally replaced by a roll changing machine when the surface of the working roll is worn to a certain degree. The existing roll changing machine is generally provided with two roll changing tracks which are respectively used for placing a work roll to be changed and a new work roll, before the roll changing, the new work roll is hoisted to one roll changing track of a roll changing trolley in advance, the work roll to be changed is unloaded from a rolling mill to the other roll changing track, then the roll changing trolley is moved, so that the roll changing track where the new work roll is positioned is aligned with the roll changing track on the rolling mill, and finally the new roll is loaded into the rolling mill.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a roll-changing device for metal strip processing line can change the roller after accomplishing the centering fast, and it is efficient to change the roller.

The utility model discloses technical scheme as follows: a roller changing device for a metal strip processing line comprises a rack and a transmission roller set arranged on the rack, wherein the rack comprises a base, a first supporting arm and a second supporting arm, the first supporting arm is vertically and fixedly arranged on one side of the top surface of the base, the second supporting arm is arranged on the other side of the top surface of the base in a sliding mode, the transmission roller set comprises two transmission rollers which are oppositely arranged up and down, the transmission rollers are arranged between the first supporting arm and the second supporting arm through bearings, a first roller is sleeved on the transmission rollers in a sliding mode, a sliding mechanism is arranged on one side, opposite to the first supporting arm, of the second supporting arm, the sliding mechanism comprises a longitudinal moving mechanism and a first air cylinder arranged on the longitudinal moving mechanism, one end of the first air cylinder, opposite to the longitudinal moving mechanism, is connected to the bottom of the second supporting arm and used for driving the second supporting arm to transversely move from the base to the longitudinal moving mechanism, the longitudinal moving mechanism drives the second supporting arm to longitudinally move so as to expose one end of the transmission roller, the sliding mechanism is provided with a roller changing mechanism on one side of the second supporting arm, the roller changing mechanism is used for changing a first roller on the conveying roller, the roller changing mechanism comprises a bearing seat, a cylinder body and a plurality of guide rollers, the cylinder body is vertically and fixedly arranged on the top surface of the bearing seat, the cylinder body is rotatably sleeved on the cylinder body and can rotate around the axial lead of the cylinder body, one end of each guide roller is fixedly arranged on the circumferential side surface of the cylinder body, the other end of each guide roller transversely extends out to be aligned with the conveying roller, the guide rollers are distributed on the circumferential side surface of the cylinder body along the circumferential direction, a second roller is sleeved on one guide roller in a sliding mode, a third driving assembly is arranged on the first supporting arm and used for driving the first roller to slide to the guide roller, and a second driving assembly is arranged on the cylinder body so that when the second roller rotates to be aligned with the conveying roller, the second roller is driven to slide to the conveying roller.

Further, indulge and move mechanism and include pedestal, carriage and second cylinder, the pedestal setting is equipped with the first track parallel with metal strip direction of transfer in the relative first support arm one side of second support arm on the pedestal, and the carriage slides and sets up on the first track of pedestal, and the vertical groove has been seted up to the pedestal, the second cylinder sets up in vertical groove, and the flexible end-to-end connection of second cylinder is in the carriage bottom for order about the carriage longitudinal movement on first track.

Furthermore, a second rail perpendicular to the conveying direction of the metal strip is arranged on the sliding frame, a third rail is arranged on one side, close to the sliding mechanism, of the base, the third rail is parallel to the second rail and is arranged on the same straight line, the second supporting arm is arranged on the third rail in a sliding mode, one end of the first air cylinder is fixedly arranged on the top surface of the sliding frame, and the other end of the first air cylinder is connected to the bottom of the second supporting arm so that the second supporting arm can be driven to slide to the second rail from the third rail.

Furthermore, a fourth track is arranged on one side, opposite to the second supporting arm, of the sliding frame, so that the bearing seat can be installed.

Furthermore, a plurality of rollers are installed on the side surface of the bearing seat, the rollers are arranged on the fourth rail, a first motor is arranged on the side surface of the bearing seat, and the output end of the first motor is in transmission connection with the rollers so as to drive the rollers and the bearing seat to move along the fourth rail.

Furthermore, a first gear is fixedly sleeved on the circumferential side face of the cylinder body, a first driving assembly is arranged on the top face of the bearing seat, the first driving assembly comprises a second motor, a transmission shaft and a second gear, the second motor is horizontally arranged on the top face of the bearing seat, the transmission shaft is vertically arranged on the top face of the bearing seat, an output shaft of the second motor is in transmission connection with one end of the transmission shaft, the other end of the transmission shaft is fixedly sleeved with the second gear, and the second gear is meshed with the first gear.

Further, roll changing mechanism is equipped with including fixing the footstock on cylinder top on the footstock second drive assembly to supply the drive second roller to slide on the deflector roll.

Further, the second driving assembly comprises a third cylinder, a hanging and holding plate and a sliding plate, the third cylinder is fixedly arranged on the side face of the top seat, a telescopic rod of the third cylinder penetrates through the top seat to be connected with the hanging and holding plate, the sliding plate is arranged on the side face, opposite to the third cylinder, of the hanging and holding plate in a sliding mode, a groove is formed in the lower end of the sliding plate, the sliding plate is clamped on the guide roller through the groove, and when the third cylinder pushes the hanging and holding plate to move together with the sliding plate, the sliding plate pushes the second roller to slide on the guide roller.

Furthermore, the slide slides through a sliding sleeve and sets up on hanging holding the board, hangs and is equipped with the fourth cylinder on holding the board, and the flexible end of fourth cylinder articulates on the slide for promote the slide and hang holding the board relatively and slide to the centre gripping deflector roll.

Further, the third driving assembly comprises a fifth cylinder and a push plate, the fifth cylinder is arranged on the side face, opposite to the conveying roller, of the first supporting arm, the telescopic end of the fifth cylinder penetrates through the first supporting arm to be connected with the push plate, a clamping groove is formed in the lower end of the push plate, the push plate is clamped on the conveying roller through the clamping groove, and the fifth cylinder pushes the push plate to slide on the conveying roller together with the first roller.

Compared with the prior art: the utility model provides a roll-changing device for metal strip processing line, through indulging moving mechanism and first cylinder and exposing transfer roller one end fast to after transfer roller and deflector roll accomplish the centering, again with the first roller propelling movement on the transfer roller to the deflector roll, then will install another deflector roll of second roller and rotate to with the transfer roller centering, at last with the second roller propelling movement to the transfer roller, accomplish the replacement of first roller and second roller, roll-changing efficiency is high; and the conveying roller and the guide roller keep highly centered in the replacement process, the centering precision is high, and the roller replacement efficiency is further improved.

Drawings

Fig. 1 is a side view of the present invention.

Fig. 2 is a plan view of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

Referring to fig. 1 and 2, a roll changing apparatus for a metal strip processing line includes a frame 1 and a driving roll set 2 disposed on the frame 1, the frame 1 includes a base 11, a first supporting arm 12 and a second supporting arm 13, the first supporting arm 12 is vertically fixed on one side of the top surface of the base 11, and the second supporting arm 13 is slidably disposed on the other side of the top surface of the base 11. The transmission roller group 2 comprises two transmission rollers 21 which are oppositely arranged up and down, the transmission rollers 21 are arranged between the first supporting arm 12 and the second supporting arm 13 through bearings, a first roller 22 is sleeved on the transmission rollers 21 in a sliding mode, and the first roller 22 is used for supporting the transmission of metal strips. In this embodiment, the first roller 22 can be moved transversely along the axial center of the conveying roller 21, so that the damaged first roller 22 can be detached from the conveying roller 21 and replaced.

One side of the second supporting arm 13, which is opposite to the first supporting arm 12, is provided with a sliding mechanism, the sliding mechanism comprises a longitudinal moving mechanism 3 and a first air cylinder 4 arranged on the longitudinal moving mechanism 3, one end of the first air cylinder 4, which is opposite to the longitudinal moving mechanism 3, is connected to the bottom of the second supporting arm 13, and is used for driving the second supporting arm 13 to transversely move to the longitudinal moving mechanism 3 from the base 11, the second supporting arm 13 is separated from one end of the conveying roller 21, and the longitudinal moving mechanism 3 drives the second supporting arm 13 to longitudinally move, so that one end of the conveying roller 21 is exposed, and the first roller 22 is replaced. The sliding mechanism is provided with a roller changing mechanism 5 at one side opposite to the second supporting arm 13, and the roller changing mechanism 5 is used for changing the first roller 22 on the conveying roller 21.

The longitudinal moving mechanism 3 comprises a seat body 31, a sliding frame 32 and a second cylinder 33, the seat body 31 is arranged on one side of the second support arm 13 opposite to the first support arm 12, a first rail 34 parallel to the direction of metal strip transmission is arranged on the seat body 31, the sliding frame 32 is arranged on the first rail 34 of the seat body 31 in a sliding manner, a longitudinal groove is formed in the seat body 31, the second cylinder 33 is arranged in the longitudinal groove, and the telescopic tail end of the second cylinder 33 is connected to the bottom of the sliding frame 32 and used for driving the sliding frame 32 to move longitudinally on the first rail 34.

The sliding frame 32 is provided with a second rail 35 perpendicular to the conveying direction of the metal strip, one side of the base 11 close to the sliding mechanism is provided with a third rail 14, the third rail 14 and the second rail 35 are parallel and on the same straight line, the second supporting arm 13 is arranged on the third rail 14 in a sliding manner, one end of the first cylinder 4 is fixedly arranged on the top surface of the sliding frame 32, and the other end of the first cylinder is connected to the bottom of the second supporting arm 13 so as to drive the second supporting arm 13 to slide from the third rail 14 to the second rail 35.

The carriage 32 is provided with a fourth rail 6 on the side opposite to the second support arm 13 for mounting the roll changing mechanism 5. Roll changing mechanism 5 is including bearing seat 51, cylinder 52, barrel 53 and a plurality of deflector roll 54, bears the side-mounting of seat 51 and has a plurality of gyro wheels 56, and gyro wheel 56 sets up and moves on fourth track 6 and along fourth track 6, and cylinder 52 sets firmly upright on bearing seat 51 top surface, and cylinder 53 rotationally overlaps and establish on cylinder 52 and can rotate around barrel 53 axial lead, and deflector roll 54 one end sets firmly on barrel 53 week side, and the other end transversely stretches out and is centering with transfer roller 21. The guide rollers 54 are distributed on the circumferential side of the cylinder 53 along the circumferential direction, wherein a second roller 55 is slidably sleeved on one of the guide rollers 54, and in this embodiment, the second roller 55 is used for replacing the first roller 22 on the conveying roller 21.

The axis of the second roller 55 is collinear with the axis of the first roller 22 so that the second roller 55 is aligned with the first roller 22 for easy roller change.

The side surface of the bearing seat 51 is provided with a first motor 57, the output end of the first motor 57 is in transmission connection with the roller 56 to drive the roller 56 to roll along the fourth track 6, and the roller 56 drives the bearing seat 51 to move along the direction of the fourth track 6.

The first gear 58 is fixedly sleeved on the peripheral side surface of the cylinder 53, the first driving assembly 7 is arranged on the top surface of the bearing seat 51, the first driving assembly 7 comprises a second motor 71, a transmission shaft 72 and a second gear 73, the second motor 71 is horizontally arranged on the top surface of the bearing seat 51, the transmission shaft 72 is vertically arranged on the top surface of the bearing seat 51, an output shaft of the second motor 71 is in transmission connection with one end of the transmission shaft 72, the second gear 73 is fixedly sleeved on the other end of the transmission shaft 72, and the second gear 73 is meshed on the first gear 58.

When the second motor 71 is driven, the second gear 73 is driven to rotate together with the first gear 58, and the first gear 58 further drives the cylinder 53 and the second roller 55 to rotate, so as to perform roller replacement.

The roller changing mechanism 5 comprises a top base 59 fixed at the top end of the cylinder 52, the second driving assembly 8 is arranged on the top base 59 and used for driving the second roller 55 to slide on the guide roller 54, the second driving assembly 8 comprises a third air cylinder 81, a hanging plate 82 and a sliding plate 83, the third air cylinder 81 is fixedly arranged on the side surface of the top base 59, an expansion rod of the third air cylinder 81 penetrates through the top base 59 and is connected with the hanging plate 82, the sliding plate 83 is slidably arranged on the side surface of the hanging plate 82 opposite to the third air cylinder 81, a groove is formed in the lower end of the sliding plate 83, and the sliding plate 83 is clamped on the guide roller 54 through the groove so that when the third air cylinder 81 pushes the hanging plate 82 and the sliding plate 83 to move, the sliding plate 83 pushes the second roller to slide on the guide roller 54.

The sliding plate 83 is slidably disposed on the hanging plate 82 through a sliding sleeve, a fourth cylinder 84 is disposed on the hanging plate 82, and a telescopic end of the fourth cylinder 84 is hinged to the sliding plate 83 for pushing the sliding plate 83 to slide relative to the hanging plate 82, so that the sliding plate 83 clamps the guide roller 54.

Be equipped with third drive assembly 9 on first support arm 12, third drive assembly 9 includes fifth cylinder 91 and push pedal 92, and fifth cylinder 91 sets up on the side of the relative transfer roller 21 of first support arm 12, and the flexible end of fifth cylinder 91 passes first support arm 12 and is connected with push pedal 92, push pedal 92's lower extreme has been seted up and has been pressed from both sides the groove, and push pedal 92 is through pressing from both sides the groove centre gripping on transfer roller 21 to when fifth cylinder 91 promoted push pedal 92, push pedal 92 promotes first roller 22 and slides on transfer roller 21.

The utility model discloses a use as follows: referring to fig. 1 and 2, when the second roller 55 needs to be replaced with the first roller 22, the first cylinder 4 drives the second supporting arm 13 to slide from the third rail 14 to the second rail 35 of the carriage 32, and the carriage 32 and the second supporting arm 13 are driven by the second cylinder to move longitudinally along the first rail 34, so as to expose one end of the conveying roller 21; the second motor 71 drives the second gear 73 to rotate together with the first gear 58, so as to drive the guide roller 54 on the cylinder 53 to rotate and align with the first roller 22, then the first motor 57 drives the roller 56 to drive the guide roller 54 on the bearing seat 51 to move to the exposed end of the conveying roller 21 along the fourth track 6 direction, and the fifth cylinder 91 pushes the push plate 92 together with the first roller 22 to slide on the conveying roller 21 to the guide roller 54 until the first roller 22 slides on the guide roller 54; the second motor 71 drives the guide roller 54 and the first roller 22 on the cylinder 53 to rotate again through the transmission rotation of the second gear 73 and the first gear 58, and rotates the second roller 55 on the other guide roller 54 to be aligned with the conveying roller 21; after the fourth air cylinder 84 pushes the sliding plate 83 to clamp the guide roller 54, the third air cylinder 81 pushes the sliding plate 83 to move, the sliding plate 83 pushes the second roller to slide on the guide roller 54 to the conveying roller 21 until the second roller 55 slides on the conveying roller 21, and then the first roller 22 can be replaced by the second roller 55; then the first motor 57 drives the roller 56 to drive the guide roller 54 and the first roller 22 on the bearing seat 51 to move to a designated position away from the conveying roller 21; finally, the second cylinder pushes the sliding rack 32 and the second supporting arm 13 to move longitudinally along the first rail 34 until the second supporting arm 13 is aligned with the conveying roller 21, then the first cylinder 4 drives the second supporting arm 13 to slide from the second rail 35 to the second rail 35 until one end of the conveying roller 21 is installed on the second supporting arm 13, and the fifth cylinder 91 drives the push plate 92 to move to the side of the first supporting arm 12, so that the second roller 55 on the conveying roller 21 can replace the first roller 22 for conveying the metal strip.

To sum up, the utility model moves the first supporting arm 12 to one side through the longitudinal moving mechanism 3 and the first cylinder 4, exposes one end of the conveying roller 21 and the first roller 22, then pushes the first roller 22 onto the guide roller 54, rotates the other guide roller 54 sleeved with the second roller 55 to be aligned with the conveying roller 21, and then pushes the second roller 55 onto the conveying roller 21, so that the first roller 22 is replaced by the second roller 55, and the roller changing efficiency is high; and the conveying roller 21 and the guide roller 54 are kept highly centered in the replacement process, so that the centering precision is high, and the roller replacement efficiency is further improved.

As long as the idea created by the present invention is not violated, various different embodiments of the present invention can be arbitrarily combined, and all the embodiments should be regarded as the content disclosed by the present invention; the utility model discloses an in the technical conception scope, carry out multiple simple variant and different embodiments to technical scheme and go on not violating the utility model discloses the arbitrary combination of the thought of creation all should be within the protection scope.

Claims

1. The utility model provides a roll change device for metal strip processing line, drive roller set (2) on including frame (1) and locating frame (1), frame (1) includes base (11), first support arm (12) and second support arm (13), first support arm (12) are upright to set firmly in base (11) top surface one side, second support arm (13) slide and set up at base (11) top surface opposite side, drive roller set (2) are including two conveying roller (21) that relative setting from top to bottom, conveying roller (21) are installed between first support arm (12) and second support arm (13) through the bearing, the slip cap is equipped with first roller (22) on conveying roller (21), its characterized in that: one side of the second supporting arm (13) opposite to the first supporting arm (12) is provided with a sliding mechanism, the sliding mechanism comprises a longitudinal moving mechanism (3) and a first cylinder (4) arranged on the longitudinal moving mechanism (3), one end of the first cylinder (4) opposite to the longitudinal moving mechanism (3) is connected to the bottom of the second supporting arm (13) and used for driving the second supporting arm (13) to transversely move to the longitudinal moving mechanism (3) from the base (11), the longitudinal moving mechanism (3) drives the second supporting arm (13) to longitudinally move so as to expose one end of the conveying roller (21), one side of the sliding mechanism opposite to the second supporting arm (13) is provided with a roller changing mechanism (5), the roller changing mechanism (5) is used for changing a first roller (22) on the conveying roller (21), the roller changing mechanism (5) comprises a bearing seat (51), a cylinder (52), a cylinder (53) and a plurality of guide rollers (54), the cylinder (52) is fixedly arranged on the top surface of the bearing seat (51), the cylinder body (53) is rotatably sleeved on the cylinder body (52) and can rotate around the axial lead of the cylinder body (53), one end of each guide roller (54) is fixedly arranged on the peripheral side face of the cylinder body (53), the other end of each guide roller transversely extends out to be aligned with the corresponding conveying roller (21), the guide rollers (54) are distributed on the peripheral side face of the cylinder body (53) along the circumferential direction, a second roller (55) is sleeved on one guide roller (54) in a sliding mode, a third driving assembly (9) is arranged on the first supporting arm (12) and used for driving the first roller (22) to slide onto the corresponding guide roller (54), and a second driving assembly (8) is arranged on the cylinder body (52) and used for driving the second roller (55) to slide onto the corresponding conveying roller (21) when the second roller (55) rotates to be aligned with the corresponding conveying roller (21).

2. The roll changing apparatus according to claim 1, wherein: indulge and move mechanism (3) mechanism and include pedestal (31), carriage (32) and second cylinder (33), pedestal (31) set up in second support arm (13) relative first support arm (12) one side, be equipped with on pedestal (31) with first track (34) that metal strip direction of transfer is parallel, carriage (32) slide to set up on first track (34) of pedestal (31), the vertical slot has been seted up in pedestal (31), second cylinder (33) set up in vertical slot, the flexible end-to-end connection of second cylinder (33) is in carriage (32) bottom for order to order about carriage (32) longitudinal movement on first track (34).

3. The roll changing apparatus according to claim 2, wherein: the metal strip conveying device is characterized in that a second rail (35) perpendicular to the conveying direction of a metal strip is arranged on the sliding frame (32), a third rail (14) is arranged on one side, close to the sliding mechanism, of the base (11), the third rail (14) is parallel to the second rail (35) and is arranged on the same straight line, the second supporting arm (13) is arranged on the third rail (14) in a sliding mode, one end of the first air cylinder (4) is fixedly arranged on the top surface of the sliding frame (32), and the other end of the first air cylinder is connected to the bottom of the second supporting arm (13) so that the second supporting arm (13) can slide to the second rail (35) from the third rail (14).

4. A roll changing device according to claim 3, characterized in that: and a fourth track (6) is arranged on one side of the sliding frame (32) opposite to the second supporting arm (13) for mounting the bearing seat (51).

5. The roll changing apparatus according to claim 4, wherein: bear seat (51) side-mounting and have a plurality of gyro wheels (56), gyro wheel (56) set up on fourth track (6), bear and be equipped with first motor (57) on the side of seat (51), the output of first motor (57) with gyro wheel (56) transmission is connected to drive gyro wheel (56) and move along fourth track (6) together with bearing seat (51).

6. The roll changing apparatus according to claim 1, wherein: fixed cover on the week side of barrel (53) is equipped with first gear (58), be equipped with first drive assembly (7) on the top surface of bearing seat (51), first drive assembly (7) include second motor (71), transmission shaft (72) and second gear (73), second motor (71) crouches and establishes on the top surface of bearing seat (51), and transmission shaft (72) are upright to be installed on the top surface of bearing seat (51), and the output shaft and transmission shaft (72) one end transmission of second motor (71) are connected, and the fixed cover in transmission shaft (72) other end is equipped with second gear (73), second gear (73) meshing is on first gear (58).

7. The roll changing apparatus according to claim 1, wherein: roll changing mechanism (5) are equipped with on footstock (59) including fixing footstock (59) on cylinder (52) top second drive assembly (8) to supply drive second roller (55) to slide on deflector roll (54).

8. The roll-changing apparatus of claim 7, wherein: the second driving assembly (8) comprises a third cylinder (81), a hanging and holding plate (82) and a sliding plate (83), the third cylinder (81) is fixedly arranged on the side face of the top seat (59), an expansion rod of the third cylinder (81) penetrates through the top seat (59) to be connected with the hanging and holding plate (82), the sliding plate (83) is arranged on the side face, opposite to the third cylinder (81), of the hanging and holding plate (82) in a sliding mode, a groove is formed in the lower end of the sliding plate (83), the sliding plate (83) is clamped on the guide roller (54) through the groove, and when the third cylinder (81) pushes the hanging and holding plate (82) and the sliding plate (83) to move, the sliding plate (83) pushes the second roller to slide on the guide roller (54).

9. The roll-changing apparatus of claim 8, wherein: the sliding plate (83) is arranged on the hanging plate (82) in a sliding mode through a sliding sleeve, a fourth cylinder (84) is arranged on the hanging plate (82), and the telescopic end of the fourth cylinder (84) is hinged to the sliding plate (83) and used for pushing the sliding plate (83) to slide to the clamping guide roller (54) relative to the hanging plate (82).

10. The roll changing apparatus according to claim 1, wherein: the third driving assembly (9) comprises a fifth air cylinder (91) and a push plate (92), the fifth air cylinder (91) is arranged on the side face, opposite to the conveying roller (21), of the first supporting arm (12), the telescopic end of the fifth air cylinder (91) penetrates through the first supporting arm (12) to be connected with the push plate (92), a clamping groove is formed in the lower end of the push plate (92), the push plate (92) is clamped on the conveying roller (21) through the clamping groove, and the fifth air cylinder (91) pushes the push plate (92) to slide on the conveying roller (21) together with the first roller (22).