CN209920169U

CN209920169U - Three-dimensional partition plate processing and maintaining system

Info

Publication number: CN209920169U
Application number: CN201920147783.4U
Authority: CN
Inventors: 胡胜魁; 程小敏; 宋垒; 裴佳彬; 龙晓东; 宋小贞; 吕富生; 张建峰; 冯茂军
Original assignee: Henan Zhongbangweiye Technology Co Ltd
Current assignee: Henan Zhongbangweiye Technology Co Ltd
Priority date: 2019-01-29
Filing date: 2019-01-29
Publication date: 2020-01-10
Anticipated expiration: 2029-01-29

Abstract

The utility model relates to the field of partition plate production and processing, in particular to a three-dimensional partition plate processing and maintenance system, which comprises a kiln body and a portal frame arranged outside the kiln body, wherein at least two kiln bodies are fixed into a whole side by side, at least three layers of compartments are arranged in each kiln body, and two side walls in each layer of compartment are provided with T-shaped slide rails; the bottom of the portal frame is transversely provided with a guide rail, the guide rail is provided with a traveling trolley, the traveling trolley is provided with a ferry vehicle' for entering and exiting a first-layer compartment of each kiln body, the ferry vehicle is provided with a steel supporting plate for bearing a partition plate, the bottom of the ferry vehicle is provided with a roller matched with a T-shaped slide rail, one side of the portal frame close to the kiln body is transversely provided with at least two ferry vehicle lifting platforms, each ferry vehicle lifting platform corresponds to each kiln body, and each ferry vehicle lifting platform is provided with a ferry vehicle; the portal frame is also provided with a gripping device capable of moving along the X direction of the portal frame; the utility model provides high partition plate processing maintenance efficiency.

Description

Three-dimensional partition plate processing and maintaining system

Technical Field

The utility model relates to a partition plate production and processing field especially relates to a three-dimensional partition plate processing maintenance system.

Background

Along with the development of science and technology, high-rise mansion all builds gradually, high-rise mansion is in the work progress, partition plate is indispensable, partition plate not only green, energy-concerving and moisture-proof, give sound insulation, and with low costs, supplementary improvement building efficiency, however partition plate is in the course of working, need stir raw materials such as cement, sand, the partition plate is made to procedures such as injection moulding, cutting, fashioned partition plate still finally need send into the curing kiln and carry out drying heating maintenance, just can process qualified partition plate, however, at present many curing kilns are the individual layer kiln body, or the individual kiln body, the work efficiency is low for the individual kiln body, low in production efficiency, and the mechanical device structure that cooperates the kiln body to carry partition plate is also very simple, greatly reduced the efficiency of partition plate processing maintenance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the not enough of prior art, avoid partition plate machining efficiency low, and provide a three-dimensional partition plate processing maintenance system, the utility model discloses a maintenance kiln that a plurality of kiln body group become cooperatees with ferry vehicle ginger platform, grabbing device, has improved partition plate processing maintenance efficiency.

The purpose of the utility model is realized through following measures: a three-dimensional partition plate processing and curing system comprises a kiln body and a portal frame arranged outside the kiln body, wherein at least two kiln bodies are fixed into a whole side by side, at least three layers of compartments are arranged in each kiln body, and T-shaped slide rails are arranged on two side walls in each layer of compartment; the bottom of the portal frame is transversely provided with a guide rail, the guide rail is provided with a traveling trolley, the traveling trolley is provided with a ferry vehicle 'for entering and exiting a first-layer compartment of each kiln body, the bottom of the ferry vehicle' is provided with a roller matched with a T-shaped slide rail, one side of the portal frame, which is close to the kiln body, is transversely provided with at least two ferry vehicle lifting platforms, each ferry vehicle lifting platform corresponds to each kiln body, and each ferry vehicle lifting platform is provided with a ferry vehicle; the portal frame is also provided with a gripping device capable of moving along the X direction of the portal frame;

the ferry vehicle lifting platform comprises an inner frame arranged on a portal frame, a lifting frame capable of lifting along the Z direction is arranged on the inner frame, a lifting assembly used for driving the lifting frame to lift is further arranged on the inner frame, a conveying table capable of moving along the Y direction is arranged on the lifting frame, an air cylinder is further arranged on the lifting frame, the driving end of the air cylinder is connected with the bottom of the conveying table, a first guide rail matched with a roller of the ferry vehicle is arranged on the conveying table, the ferry vehicle is clamped on the first guide rail, a second guide rail is arranged on the lifting frame, and a clamping groove clamped on the second guide rail is formed in the bottom of the conveying table;

grabbing device is including setting up the first well frame that can follow portal frame X on the portal frame to the removal, be provided with on the first well frame and follow first well frame Y to the first inner frame that removes to the lift platform top, be provided with on the first inner frame and be used for snatching the steel layer board and place the lift gripper subassembly on the ferry vehicle, lift gripper subassembly is including installing in the mounting panel at first inner frame middle part, be provided with two guide posts that can follow Z to the oscilaltion on the mounting panel, still be provided with on the mounting panel and match the sliding sleeve of suit with the guide post, two guide post bottom symmetries are provided with the gripper, be provided with between the gripper and be used for driving the cylinder that the gripper stretched.

Preferably, lifting unit is including installing the axis of rotation on the internal frame, the axis of rotation is four, and parallel mount is in the top and the below at both ends about the internal frame respectively, and the axis of rotation is followed Y and is set up to the setting, all corresponds in every axis of rotation and installs the sprocket, is connected with vertical chain between the sprocket that internal frame top and below correspond, partly and the lift frame of vertical chain are fixed, are connected with in the arbitrary axis of rotation and are used for driving axis of rotation pivoted motor, and the axis of rotation at both ends is passed through horizontal chain connection about the internal frame top.

Preferably, the inner frame is provided with sliding grooves along the Z direction at positions corresponding to four corners of the lifting frame, and the four corners of the lifting frame are provided with guide blocks capable of being inserted into the sliding grooves.

Preferably, the guide block is a rolling wheel, four rolling wheels of the lifting frame are in contact with the inner wall of the inner side of the sliding groove, the cross section of each rolling wheel is T-shaped, and the outermost end of each rolling wheel is blocked at the opening of the sliding groove.

Preferably, a first pulley capable of moving in the X direction on the portal frame is arranged on the first middle frame, a first rotating shaft is further horizontally arranged on the first middle frame in the Y direction, first rotating wheels horizontally corresponding to the first pulley are arranged at two ends of the first rotating shaft, and a first motor is further arranged on the first middle frame and connected with the first rotating shaft through a chain.

Preferably, a second pulley capable of moving in the Y direction on the first middle frame is arranged on the first inner frame, a second rotating shaft is transversely arranged on the first inner frame, two rotating wheels horizontally corresponding to the second pulley are arranged at two ends of the second rotating shaft, a second motor is further arranged on the mounting plate, and the second motor is connected with the second rotating shaft through a chain.

Preferably, the top of guide post is provided with the cross, be provided with motor three on the mounting panel, through the vertical connection of chain between cross, motor three, the gripper, and the chain top is fixed with the cross, and the chain bottom is fixed with the gripper.

Preferably, a first chain wheel and a second chain wheel are further arranged on one side of the motor III on the mounting plate, two ends of the chain are respectively fixed on the cross and the gripper, and the middle of the chain sequentially passes through the first chain wheel, the motor III and the second chain wheel.

Preferably, the gripper comprises a gripper rod, the gripper rod is vertically provided with at least four connecting levers, the top ends of the connecting levers are provided with connecting rods, the connecting rods are obliquely provided with push arms, and the driving ends of the first cylinders are hinged to the push arms.

The utility model has the advantages that: this processing maintenance system work efficiency in novel is high, and is with low costs, it is fixed side by side with a plurality of kiln bodies, and every kiln body divide into the three-layer compartment at least, the maintenance efficiency of partition plate has further been increaseed, can satisfy the demand of maintaining a lot of partition plates simultaneously, all kiln body gates of one deck can be sent to the ferry car with ferry car 'to the walking dolly of bottommost, thereby the ferry car' business turn over one deck kiln internal transport partition plate, ferry car lift platform is used for carrying the partition plate in going up and down the compartment of the same row of kiln body co-altitude with the ferry car, grabbing device can grab the steel splint that the one deck carried partition plate and send each ferry car lift platform to on the ferry car, whole flow automation is more smooth and easy.

Drawings

FIG. 1 is a front view of a processing and maintenance system;

FIG. 2 is a top view of the processing and maintenance system;

FIG. 3 is a schematic structural view of a single kiln body;

FIG. 4 is an enlarged schematic view of FIG. 3 at C;

FIG. 5 is a schematic view of the combination structure of the lifting platform and the gripping device of the ferry vehicle;

FIG. 6 is a front view of the ferry vehicle lift platform and gripping device combination;

FIG. 7 is a left side view of the ferry vehicle lift platform and gripping device combination;

FIG. 8 is a schematic view of the overall structure of a ferry vehicle lifting platform;

FIG. 9 is a front view of the ferry vehicle lift platform;

FIG. 10 is a right side view of the ferry vehicle lift platform;

FIG. 11 is a second schematic structural view of the elevating platform;

FIG. 12 is an enlarged view of A in FIG. 8;

FIG. 13 is a schematic view of the overall structure of the grasping apparatus;

FIG. 14 is a schematic view of the first mid-frame and the lift gripper assembly;

FIG. 15 is a top view of the first mid-frame and the lift gripper assembly;

FIG. 16 is a front view of the first mid-frame and the lift gripper assembly;

FIG. 17 is a driving relationship diagram of the chain wheel I, the cross, the motor III and the gripper;

FIG. 18 is an enlarged view of B in FIG. 14;

FIG. 19 is a walking trolley;

fig. 20 shows a ferry vehicle.

In the figure: 1-a portal frame, 3-a kiln body, 4-T-shaped slide rails, 5-guide rails, 6-a traveling trolley, 7-a ferry vehicle' and 8-pulleys;

101-inner frame, 102-lifting frame, 103-conveying table, 104-air cylinder, 105-guide rail I, 106-guide rail II, 107-clamping groove, 108-rotating shaft, 109-chain wheel, 110-vertical chain, 111-motor, 112-transverse chain, 113-sliding groove and 114-rolling wheel;

201-first middle frame, 202-first inner frame, 203-mounting plate, 204-guide column, 205-sliding sleeve, 206-gripper, 207-cylinder I, 208-pulley I, 209-rotating shaft I, 210-rotating wheel I, 211-motor I, 212-pulley II, 213-rotating shaft II, 214-rotating wheel II, 215-motor II, 216-cross, 217-motor III, 218-chain wheel I, 219-chain wheel II, 220-gripper bar, 221-crank arm, 222-connecting rod and 223-push arm.

Detailed Description

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1: as shown in fig. 1-20, a three-dimensional partition plate processing and maintenance system comprises a kiln body 3 and a portal frame 1 arranged outside the kiln body, wherein at least two kiln bodies are fixed side by side into a whole, the number of the kiln bodies in the utility model is 7, at least three layers of compartments are arranged in each kiln body, and T-shaped slide rails 4 are arranged on two side walls in each layer of compartment; the bottom of the portal frame is transversely provided with a guide rail 5, the direction of the guide rail is just vertical to the direction corresponding to the door of the kiln body, the guide rail is provided with a walking trolley 6, the walking trolley is provided with a ferry vehicle 7 used for entering and exiting the first-layer compartment of each kiln body, the bottom of the ferry vehicle 7 is provided with a pulley 8 matched with a T-shaped slide rail, namely, the bottom layer works in a mode that the walking trolley carries the ferry vehicle to walk on the guide rail, after the walking to the door of each kiln body, the ferry vehicle is connected with the kiln body to enter the kiln body to convey a partition plate, the bottom of the partition plate is provided with a steel supporting plate, then the steel supporting plate is arranged on the ferry vehicle 7, all the kiln bodies of the first layer share one ferry vehicle', one side of the portal frame, which is close to the kiln body, is transversely provided with at least two ferry vehicle lifting platforms, and each ferry vehicle lifting platform corresponds to each, the ferry vehicle is placed on each ferry vehicle lifting platform, the ferry vehicle lifting platforms are 7 in the utility model, and correspond to the kiln bodies one by one, so that the kiln bodies in the same row share one ferry vehicle, namely, two three layers and the higher layer of one kiln body share one ferry vehicle, and the ferry vehicle is conveyed to the kiln body gates with different heights and different layers by utilizing the lifting platforms to correspondingly connect rails; the portal frame is also provided with a grabbing device capable of moving along the X direction of the portal frame, the grabbing device is used for grabbing and sending the bottom partition plate to a ferry vehicle of the lifting platform, and the ferry vehicle has the same structure as the ferry vehicle and is only used for conveying the partition plates at different heights.

As shown in fig. 8-12 and 5-7, the ferry vehicle lifting platform comprises an inner frame 101 installed on a portal frame 1, wherein a lifting frame 102 capable of lifting along the Z direction is installed on the inner frame 101, that is, the lifting frame 102 is lifted back and forth inside the inner frame, a lifting assembly for driving the lifting frame to lift is further arranged on the inner frame, the lifting assembly comprises four rotating shafts 108 installed on the inner frame, the four rotating shafts are respectively installed above and below the left and right ends of the inner frame in parallel, the rotating shafts 108 are arranged along the Y direction, that is, rotating shafts are installed above and below the inner frame, the four rotating shafts are also distributed at the left and right ends, the rotating shafts above and below need to correspond, a chain wheel 109 is correspondingly installed on each rotating shaft, a vertical chain 110 is connected between the chain wheels above and below the inner frame, and a part of the vertical chain is fixed with the lifting, be connected with on arbitrary axis of rotation and be used for driving axis of rotation pivoted motor 111, the motor rotates promptly, and the axis of rotation then rotates, and the axis of rotation synchronous rotation of upper and lower side under vertical even drive of strip, the axis of rotation at both ends is passed through horizontal chain 112 and is connected about the internal frame top simultaneously, and the axis of rotation of one side has rotated promptly, and the axis of rotation of opposite side is followed along with synchronous rotation, then drives whole lifting frame oscilaltion when vertical chain goes up and down. Sliding grooves 113 are formed in the inner frame corresponding to the four corners of the lifting frame along the Z direction, guide blocks capable of being inserted into the sliding grooves are installed at the four corners of the lifting frame, namely, the guide blocks can be lifted up and down in the sliding grooves in the lifting process, so that the guiding effect is achieved, in order to further optimize the scheme, the guide blocks are designed into rolling wheels 114, the four rolling wheels of the lifting frame are all in contact with the inner wall of the inner side position of the sliding grooves, namely, every two rolling wheels tightly clamp the whole lifting frame, namely, each rolling wheel is attached to the inner wall, which is the most inner side of the sliding grooves, of the inner frame, when the rolling wheels rise or fall in the sliding grooves, the rolling wheels can roll along the inner wall in a friction mode, the lifting frame rises and falls smoothly, the lifting frame is fixed in position, the front and back shaking conditions cannot occur, the cross sections of the rolling wheels are in a T shape, and the outermost, the biggest terminal surface of rolling wheel area can block in the opening part of spout promptly, and then goes up and down more firmly, and the side rocks about can not appearing.

Install on the lift frame and to carrying platform 103 that removes along Y, still install cylinder 104 on the lift frame, the drive end of cylinder 104 is connected with carrying the platform bottom, carry the bench install with ferry vehicle gyro wheel assorted guide rail 105, install guide rail two 106 on the lift frame, carry the platform bottom to be equipped with the draw-in groove 107 of card on the guide rail, the draw-in groove card of carrying the platform is on guide rail two, by cylinder propelling movement back, carry the platform to remove, a guide rail butt joint for with the curing kiln, thereby ferry vehicle on carrying the platform can move in the curing kiln.

As shown in fig. 13-20 and fig. 5-7, the gripping device includes a first middle frame 201 that is mounted on the gantry and can move in the X direction of the gantry, a first pulley 208 that can move in the X direction of the gantry is mounted on the first middle frame 201, four pulleys are respectively distributed at four corners of the first middle frame, the first pulley can travel on the gantry 1, a first rotating shaft 209 is further mounted on the first middle frame 201 in the horizontal Y direction, first rotating wheels 210 horizontally corresponding to the first pulleys are arranged at two ends of the first rotating shaft, a first motor 211 is further mounted on the first middle frame 201, the first motor 211 is connected with the first rotating shaft 209 through a chain, that is, the first motor is a motor driving source, the first motor drives the first rotating shaft to rotate, the first rotating wheels perform X direction movement on the gantry, and the first pulley drives the whole first middle frame to perform horizontal movement. The first middle frame is provided with a first inner frame 202 capable of moving along the Y direction of the first middle frame, the first inner frame 202 is provided with a lifting gripper assembly, namely the first inner frame moves in the first middle frame and moves along the horizontal Y direction, namely the first inner frame can move above the lifting platform along the Y direction and corresponds to the lifting platform, the lifting gripper assembly can be driven to move when the first inner frame moves, when the first middle frame moves horizontally, the first inner frame and the lifting gripper assembly can be driven to move, the first inner frame is provided with a second pulley 212 capable of moving along the Y direction on the first middle frame, the second pulley 212 is also arranged at four corners of the first inner frame and is used for moving along the horizontal Y direction on the first middle frame, the first inner frame is further provided with a second rotating shaft 213 in the transverse direction (X direction), two rotating wheels 214 horizontally corresponding to the second pulley are arranged at two ends of the second rotating shaft 213, the lifting gripper assembly comprises a mounting plate 203 mounted in the middle of the first inner frame, a second motor 215 is further arranged on the mounting plate 203, the second motor 215 is connected with a second rotating shaft through a chain, namely the second motor is a driving source for the first inner frame to walk, the second motor rotates to drive the second rotating shaft to rotate, and then the second pulley drives the whole first inner frame to move and walk on the first middle frame.

The mounting plate of the lifting gripper assembly is further provided with two guide posts 204 capable of ascending and descending along the Z direction, the mounting plate is further provided with a sliding sleeve 205 matched with the guide posts in a sleeved mode, grippers 206 are symmetrically mounted at the bottoms of the two guide posts, a first cylinder 207 for driving the grippers to stretch is mounted between the grippers 206, the guide posts 204 drive the grippers 206 to ascend and descend, meanwhile, due to the arrangement of the sliding sleeve, the guide posts can ascend and descend more smoothly, a cross 216 is arranged at the top ends of the guide posts, a motor III 217 is mounted on the mounting plate, the cross 216, the motor III 217 and the grippers 206 are connected through a chain, the top of the chain is fixed with the cross, the bottom of the chain is fixed with the grippers, the motor III rotates while the chain is meshed with the motor III 217, the whole gripper set can ascend and descend, the principle is similar to the relation between a gear and a rack, and in order to prevent the chain from sideslip, a first chain wheel 218 is further, The second chain wheel 219, the first chain wheel and the second chain wheel are vertically installed, two ends of the chain are fixed to the cross 216 and the gripper 206 respectively, and the middle of the chain sequentially passes through the first chain wheel, the third motor and the second chain wheel. The gripper comprises a gripper rod 220, at least four connecting levers 221 are vertically arranged on the gripper rod 220, a connecting rod 222 is arranged at the top end of each connecting lever, a pushing arm 223 is obliquely arranged on each connecting rod, the driving end of a first cylinder is hinged to each pushing arm, namely the first cylinder acts, the pushing arms rotate passively, the connecting rods are driven to rotate, the gripper rods at the lower ends of the connecting rods act inwards, and then the steel supporting plate can be gripped tightly. X, Y, Z directions are horizontal transverse direction, horizontal longitudinal direction and up-down lifting direction in a three-dimensional space; the first middle frame drives the whole first inner frame and the gripper assembly to walk to a proper place, the steel supporting plate at the bottommost layer is gripped, the steel supporting plate carries the partition plate, then the first middle frame moves to a row corresponding to the ferry vehicle lifting platform in the X direction, the first inner frame drives the gripper assembly and the partition plate to move to the position above the conveying platform in the Y direction, the gripper places the whole steel supporting plate with the partition plate on the ferry vehicle of the conveying platform, and then the ferry vehicle lifting platform is lifted and matched with the maintenance kiln.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides a three-dimensional partition plate processing maintenance system which characterized in that: the kiln comprises a kiln body and a portal frame arranged outside the kiln body, wherein at least two kiln bodies are fixed into a whole side by side, at least three layers of compartments are arranged in each kiln body, and T-shaped sliding rails are arranged on two side walls in each layer of compartment; the bottom of the portal frame is transversely provided with a guide rail, the guide rail is provided with a traveling trolley, the traveling trolley is provided with a ferry vehicle 'for entering and exiting a first-layer compartment of each kiln body, the bottom of the ferry vehicle' is provided with a pulley matched with a T-shaped slide rail, one side of the portal frame, which is close to the kiln body, is transversely provided with at least two ferry vehicle lifting platforms, each ferry vehicle lifting platform corresponds to each kiln body, and each ferry vehicle lifting platform is provided with a ferry vehicle; the portal frame is also provided with a gripping device capable of moving along the X direction of the portal frame;

2. The three-dimensional partition plate processing and maintaining system of claim 1, wherein: lifting unit is including installing the axis of rotation on the internal frame, the axis of rotation is four, and parallel mount is in the top and the below at both ends about the internal frame respectively, and the axis of rotation is along Y to setting up, all corresponds in every axis of rotation and installs the sprocket, is connected with vertical chain between the sprocket that internal frame top and below correspond, partly fixed with the lift frame of vertical chain, be connected with in the arbitrary axis of rotation and be used for driving axis of rotation pivoted motor, the axis of rotation at both ends is passed through horizontal chain connection about the internal frame top.

3. The three-dimensional partition plate processing and maintaining system of claim 1, wherein: and sliding grooves are formed in the positions, corresponding to the four corners of the lifting frame, of the inner frame along the Z direction, and guide blocks capable of being inserted into the sliding grooves are arranged at the four corners of the lifting frame.

4. The three-dimensional partition plate processing and maintaining system of claim 3, wherein: the guide block is a rolling wheel, four rolling wheels of the lifting frame are all in contact with the inner wall of the inner side of the sliding groove, the cross section of each rolling wheel is T-shaped, and the outermost end of each rolling wheel is blocked at the opening of the sliding groove.

5. The three-dimensional partition plate processing and maintaining system of claim 1, wherein: the gantry crane is characterized in that a first pulley capable of moving in the X direction on the gantry is arranged on the first middle frame, a first rotating shaft is further arranged on the first middle frame in the horizontal Y direction, first rotating wheels horizontally corresponding to the first pulley are arranged at two ends of the first rotating shaft, and a first motor is further arranged on the first middle frame and is connected with the first rotating shaft through a chain.

6. The three-dimensional partition plate processing and maintaining system of claim 1, wherein: the first inner frame is provided with a second pulley capable of moving in the Y direction on the first middle frame, the first inner frame is transversely provided with a second rotating shaft, two ends of the second rotating shaft are provided with second rotating wheels horizontally corresponding to the second pulleys, the mounting plate is further provided with a second motor, and the second motor is connected with the second rotating shaft through a chain.

7. The three-dimensional partition plate processing and maintaining system of claim 1, wherein: the top of guide post is provided with the cross, be provided with motor three on the mounting panel, through the vertical connection of chain between cross, motor three, the gripper, and the chain top is fixed with the cross, and the chain bottom is fixed with the gripper.

8. The three-dimensional partition plate processing and maintaining system of claim 7, wherein: and a first chain wheel and a second chain wheel are further arranged on one side of the third motor on the mounting plate, two ends of the chain are respectively fixed on the cross and the gripper, and the middle part of the chain sequentially passes through the first chain wheel, the third motor and the second chain wheel.

9. The three-dimensional partition plate processing and maintaining system of claim 1, wherein: the gripper comprises a gripper rod, wherein at least four connecting levers are vertically arranged on the gripper rod, a connecting rod is arranged at the top end of each connecting lever, a pushing arm is obliquely arranged on each connecting rod, and the driving end of a first air cylinder is hinged to the pushing arm.