CN216025899U - Device is used in production of compound glued membrane - Google Patents

Abstract

The utility model relates to the technical field of adhesive film processing equipment, in particular to a device for producing a composite adhesive film. The specific technical scheme is as follows: the utility model provides a device is used in production of compound glued membrane, includes the platform, the symmetry is provided with from type membrane roller and rolling roller on the mesa of its length direction is followed to the platform, be provided with reciprocating motion's extrusion mechanism between type membrane roller and the rolling roller, the ascending bilateral symmetry of platform length direction is provided with linear slide rail, be provided with the slider of adaptation on the slide rail, extrusion mechanism passes through the mount and fixes on the slider, extrusion mechanism is through setting up the first lead screw of the bottom of platform and the first screw drive of complex with it extrusion mechanism reciprocating motion. The utility model solves the problem of hot bending film layering in the prior art.

Description

Device is used in production of compound glued membrane

Technical Field

The utility model relates to the technical field of adhesive film processing equipment, in particular to a device for producing a composite adhesive film.

Background

The 5D hot bending explosion-proof membrane is commonly used for surface protection of a touch display screen of a mobile phone bending panel, an automobile windshield film and a high-rise office building glass curtain wall film, and can effectively buffer impact, prevent a screen or glass from bursting, or prevent the glass panel from being broken and scattered due to accidental impact of a mobile phone, or prevent drivers and passengers from being injured and killed due to knocking and breaking of the automobile windshield, reduce hidden damage of the glass panel and ensure the safety of users; the special protection function of maintaining the special luster and texture of the tempered glass and improving the surface hardness can be realized. The 5D hot bending explosion-proof membrane is formed by hot pressing of an optical PC membrane, optical acrylate glue, an optical TPU membrane and an organic silicon adhesive, but the hot bending membrane is pressed by adopting a hot pressing process, so that the problem of layering caused by untight adhesion between the membranes exists.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a device for producing a composite adhesive film, which solves the problem of hot bending film layering in the prior art.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

the utility model discloses a device for producing a composite adhesive film, which comprises a platform, wherein a release film roller and a winding roller are symmetrically arranged on the table top of the platform along the length direction of the platform, a reciprocating extrusion mechanism is arranged between the release film roller and the winding roller, linear slide rails are symmetrically arranged on two sides of the platform in the length direction, adaptive slide blocks are arranged on the slide rails, the extrusion mechanism is fixed on the slide blocks through a fixed frame, and the extrusion mechanism drives the extrusion mechanism to reciprocate through a first lead screw arranged at the bottom of the platform and a first screw matched with the first lead screw.

Preferably, the extruding mechanism comprises an extruding box, a flow guide hopper arranged at the bottom of the extruding box and a flat extruding head arranged at the bottom of the flow guide hopper, and the width of the inner cavity of the extruding head is gradually reduced from the joint of the extruding head and the flow guide hopper to the direction of the platform surface of the platform.

Preferably, a plurality of solvent cavities are divided into in the extrusion box through a plurality of partition plates, each solvent cavity is provided with a liquid outlet pipe at the bottom, and a valve is arranged on the liquid outlet pipe.

Preferably, a baffle is transversely arranged in the extrusion box, and the liquid outlet pipe penetrates through the baffle and is sealed with the baffle.

Preferably, the side wall of the diversion hopper close to the extrusion box is communicated with a booster pump through a pipeline, and the booster pump is fixed on the side wall of the extrusion box.

Preferably, the bottom surface symmetry of platform is provided with the backup pad, the both ends of first lead screw pass through the bearing with the backup pad respectively and are fixed, wherein one end of first lead screw stretches out outside the backup pad and is fixed with first motor, the symmetry is provided with the link on the lateral wall of first screw, the other end of link is fixed respectively on the slider.

Preferably, be provided with the tensioning roller on the platform between from type membrane roller and the rolling roller, the mesa setting that the tensioning roller is close to the platform.

Preferably, the platform has seted up the bar hole along its length direction's center department, the downthehole adsorption apparatus that is provided with of bar, adsorption apparatus is including setting up at the downthehole just open-top's of bar absorption cover, the bottom intercommunication of absorption cover has miniature aspirator pump, the other end of miniature aspirator pump is fixed on the second screw, it is provided with the second lead screw to run through on the second screw, the both ends of second lead screw respectively with the backup pad passes through the bearing and fixes, wherein one end of second lead screw stretches out outside the backup pad and is fixed with the second motor, the second lead screw is located the top of first lead screw.

Preferably, the air pipe of the miniature air suction pump is sleeved with a guide block, and the guide block is positioned in the strip-shaped hole and is in contact with the side wall of the strip-shaped hole in the width direction.

Preferably, the table top of the platform is provided with parallel flow guide grooves along the length direction of the platform, and the distance between the two flow guide grooves is greater than or equal to the length of the extrusion head.

Preferably, the winding roller is fixed on the platform through symmetrically arranged fixing plates, waist-shaped holes are vertically formed in the fixing plates, telescopic rods are vertically arranged in the waist-shaped holes, bearings are fixed to the other ends of the telescopic rods, roller shafts of the winding roller respectively penetrate through the bearings on the telescopic rods, at least one end of each roller shaft extends out of the fixing plate and is connected with a telescopic mechanism through the bearings which are sleeved, and the telescopic mechanisms are fixed on the fixing plates; and one end of the roll shaft extending out of the fixed plate is connected with a third motor through a belt wheel.

The utility model has the following beneficial effects:

according to the utility model, the hot-bending film with a multilayer structure is obtained by processing in a mode of overlapping and coating layer by layer, meanwhile, a plurality of layers of different solvents are coated on the release paper through the extrusion mechanism, and the different solvents are stacked on the release paper in a liquid state.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a view taken along line A-A of FIG. 1;

FIG. 3 is a view taken along line B-B of FIG. 1;

FIG. 4 is a schematic view of a hot-bent film;

in the figure: platform 1, from type membrane roller 2, rolling roller 3, slide rail 4, slider 5, mount 6, first lead screw 7, first screw 8, extrude case 9, water conservancy diversion fill 10, extrude first 11, baffle 12, solvent chamber 13, drain pipe 14, baffle 15, booster pump 16, backup pad 17, first motor 18, link 19, tensioning roller 20, bar hole 21, adsorption cage 22, miniature aspirator pump 23, second screw 24, second lead screw 25, second motor 26, guide block 27, guiding gutter 28, fixed plate 29, kidney-shaped hole 30, telescopic link 31, roller 32, telescopic machanism 33, third motor 34, spacing strip 35.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Unless otherwise indicated, the technical means used in the examples are conventional means well known to those skilled in the art.

Referring to fig. 1-3, the utility model discloses a device for producing a composite adhesive film, which comprises a platform 1, wherein a release film roller 2 and a winding roller 3 are symmetrically arranged on a table top of the platform 1 along the length direction of the platform, the release film roller 2 and the winding roller 3 are arranged at two ends close to the length direction of the platform 1, a release film is wound on the release film roller 2, and the winding roller 3 is used for finally winding up a formed composite adhesive film. An extrusion mechanism which reciprocates is arranged between the release film roller 2 and the rolling roller 3, and a base mechanism which reciprocates coats other solvents on the release film, thereby forming a film structure. In order to realize the reciprocating motion of the extruding mechanism, linear slide rails 4 are symmetrically arranged on two sides of the platform 1 in the length direction, adaptive slide blocks 5 are arranged on the slide rails 4, the slide blocks 5 move along the slide rails 4, and the extruding mechanism is fixed on the slide blocks 5 through a fixing frame 6 so as to realize the reciprocating motion of the extruding mechanism. Specifically, the method comprises the following steps: the extrusion mechanism is driven to reciprocate by a first lead screw 7 arranged at the bottom of the platform 1 and a first nut 8 matched with the first lead screw.

Furthermore, support plates 17 are symmetrically arranged on the bottom surface of the platform 1 along the length direction thereof, the first screw 7 is arranged between the two support plates 17, and the two ends thereof are respectively fixed with the support plates 17 through bearings, one end of the first lead screw 7 passes through the outside of the supporting plate 17 and is fixed with a first motor 18, the first lead screw 7 is driven to rotate by the first motor 18, so that the first screw nut 8 moves linearly along the first lead screw 7, the side walls of the first screw nut 8 are symmetrically provided with connecting frames 19, the other ends of the connecting frames 19 are respectively fixed on the sliding blocks 5, in the utility model, the connecting frames 19 are L-shaped, in the process of the linear motion of the first screw 8, the connecting frame 19, the sliding block 5, the fixing frame 6 and the extrusion box 9 are driven to do linear motion along the first screw 7, and finally the extrusion mechanism reciprocates on the platform 1, so that different solvents or reagents are sequentially coated on release paper.

Specifically, the method comprises the following steps: the extruding mechanism comprises an extruding box 9, a flow guide hopper 10 arranged at the bottom of the extruding box 9 and an extruding head 11 which is arranged at the bottom of the flow guide hopper 10 and is flat, and the width of a cavity in the extruding head 11 is gradually reduced from the connecting part of the extruding head 11 and the flow guide hopper 10 to the direction of the table top of the platform 1. It should be noted that: the width of the guide funnel 10 is gradually reduced from the connection with the extrusion tank 9, so that the solvent can flow into the extrusion head 11 along the side wall of the guide funnel 10. The width of the extrusion head 11 is smaller than the width of the platform 1. Meanwhile, in order to avoid the solvent from flowing onto the platform after being extruded, and then flowing onto the bottom surface, the flow guide grooves 28 which are parallel to each other are arranged on the table top of the platform 1 along the length direction of the platform, the two flow guide grooves 28 are arranged close to the edge of the platform, the distance between the two flow guide grooves 28 is more than or equal to the length of the extrusion head 11, the solvent extruded by the extrusion head 11 can flow into the flow guide grooves 28, and then the storage barrel is placed at one end of the flow guide grooves below the platform for collection. The width of the extrusion port of the extrusion head 11 is small, about 1 to 3 mm. And extrude head 11 and be the rubber material, extrude under the unchangeable condition of the height of case 9 for platform 1, extrude head 11 and can succeed in on the release paper coating multilayer solvent.

Furthermore, in order to extrude different solvents through the extrusion head, the inside of the extrusion box 9 is divided into a plurality of solvent cavities 13 through a plurality of partition plates 12, a liquid outlet pipe 14 is arranged at the bottom of each solvent cavity 13, and a valve is arranged on each liquid outlet pipe 14. It should be noted that: a funnel-shaped material guide hopper with a funnel-shaped section is arranged between the partition plate 12 and the inner wall of the extrusion box 9, between the partition plate 12 and at the bottom of the accommodating cavity 13, a liquid outlet pipe 14 is arranged at the bottom of the material guide hopper, and a valve on the liquid outlet pipe 14 can be a metering valve. The top of the extrusion box 9 is provided with a plurality of liquid inlets which are in one-to-one correspondence with the solvent cavities 13.

Further, since the solvent has a certain viscosity and is not easily extruded from the extrusion head 11, it is necessary to pressurize the inside of the guide duct 10. Meanwhile, in order to reduce the space in the diversion hopper 10, a baffle plate 15 is transversely arranged in the extrusion box 9, and the liquid outlet pipe 14 penetrates through the baffle plate 15 and is hermetically fixed with the baffle plate 15. Of course, the pressure in the guide hopper 10 can be increased without providing the baffle 15. The side wall of the flow guide hopper 10 close to the extrusion box 9 is communicated with a booster pump 16 through a pipeline, and the booster pump 16 is fixed on the side wall of the extrusion box 9. An air inlet on the flow guide hopper 10, which is communicated with the booster pump 16, is arranged close to the extrusion box 9, and preferably: solvent does not fall onto the gas inlet when it is left behind from the outlet pipe 14 adjacent to the gas inlet. The pressure in the pod 10 is changed by the pressurizing pump 16, and the solvent is extruded through the extrusion head 11.

Meanwhile, the valves on the liquid outlet pipe 14 are electronic valves and are respectively controlled by a PLC controller, so that different solvents in different accommodating cavities 3 are controlled to enter the diversion hopper 10. The solvent is finally extruded from the extrusion head 11 by a booster pump 16. Because the extrusion opening gap of the extrusion head 11 is very small, the solvent can not flow down quickly in the diversion hopper 10; meanwhile, in the diversion hopper 10, under the condition that the solvent exists, a closed space is formed in the diversion hopper 10, so that the solvent cannot easily flow down.

Further, in order to lay the release paper on the platform smoothly, a tension roller 20 is arranged on the platform 1 between the release film roller 2 and the winding roller 3, the tension roller 20 is arranged close to the table top of the platform 1, and preferably, the side wall of the tension roller 20 is in contact with the platform 1. It should be noted that: the two tension rollers 20 are preferably arranged and are respectively close to the release film roller 2 and the winding roller 3, so that release paper between the two tension rollers 20 is paved on a platform. And the tensioning roller 20 and the release film roller 2 are fixed on the platform through a bracket. The tensioning roller 20 is made of rubber, so that the release paper and the composite adhesive film are prevented from being scratched.

Further, in order to change from type paper or cut out the back from type paper, roll up on rolling roller 3 again, strip hole 21 has been seted up along its length direction's center department at platform 1, be provided with adsorption apparatus in the strip hole 21, adsorption apparatus is including setting up in strip hole 21 and open-top's adsorption cover 22, adsorption cover 22 is the rubber material, the bottom intercommunication of adsorption cover 22 has miniature aspirator pump 23, the other end of miniature aspirator pump 23 is fixed on second screw 24, it is provided with second lead screw 25 to run through on the second screw 24, the both ends of second lead screw 25 pass through the bearing with backup pad 17 respectively and fix, one of them one end of second lead screw 25 stretches out outside backup pad 17 and is fixed with second motor 26, second lead screw 25 is located first lead screw 7's top. It should be noted that: the adsorption cover 22 is reciprocated in the strip-shaped hole 21 by the cooperation of the second lead screw 25 and the second nut 24, and the movement mode of the adsorption cover is the same as that of the first lead screw and the first nut. The top of the adsorption cover 22 can be positioned in the strip-shaped hole 21 or can be flush with the table top of the platform 1. Under the action of the micro air suction pump 23, the adsorption cover 22 adsorbs the release paper, and then the second screw 24 drives the adsorption cover 22 and the empty release paper to move towards the winding roller 3 until the release paper moves to the lower part of the winding roller 3, namely the strip-shaped holes 21 extend to the lower part of the winding roller 3.

Furthermore, in order to stabilize the operation of the adsorption cover 22 in the strip-shaped hole 21, a guide block 27 is fixedly sleeved on the air pipe of the micro air suction pump 23, and the guide block 27 is positioned in the strip-shaped hole 21 and contacts with the side wall of the strip-shaped hole 21 in the width direction. And the air pipe of the micro air suction pump 23 is a metal straight pipe connected with the adsorption cover 22.

Further, in order to enable the composite adhesive film to be rolled on the rolling roller 3, a layer of adhesive substance similar to a colloid substance on a washable hair sticking device is wrapped on the outer side wall of the rolling roller 3. Meanwhile, the winding roller 3 is fixed on the platform 1 through a fixing plate 29 which is symmetrically arranged, a waist-shaped hole 30 is vertically formed in the fixing plate 29, an expansion rod 31 is vertically arranged in the waist-shaped hole 30, and a bearing is fixed at the other end of the expansion rod 31 and is separated from the waist-shaped hole 30 and is not fixed; two ends of a roller shaft 32 of the winding roller 3 respectively penetrate through bearings on the telescopic rod 31, and the roller shaft 32 is not fixed with the bearings. At least one end of the roll shaft 32 extends out of the fixed plate 29 and is connected with a telescopic mechanism 33 through a sleeved bearing, and the telescopic mechanism 33 is fixed on the fixed plate 29; the end of the roller shaft 32 extending out of the fixing plate 29 is connected with a third motor 34 through a belt wheel. It should be noted that: the roller shaft 32 on the winding roller 3 is not fixed with the winding roller 3, the telescopic mechanism 33 can be an air cylinder or an electric telescopic rod, a bearing is fixed at the output end of the telescopic mechanism 33, and the roller shaft 32 penetrates through the bearing and is not fixed with the bearing. Meanwhile, in order to increase the stability of the downward movement of the rolling roller 3, two telescopic mechanisms 33 are arranged and respectively fixed on the two fixing plates 29, and the two telescopic mechanisms 33 inspire simultaneously, so that the rolling roller 3 moves downward stably until the rolling roller 3 contacts with the composite adhesive film and is stained with the composite adhesive film. Then, the third motor 34 is started, and the winding roller 3 rotates, so that the composite adhesive film is wound on the winding roller. Finally, the retracting mechanism 33 is reset, but of course, the retracting mechanism 33 may be reset before the third motor 34 is started.

It should be noted that: the composite film is not rolled on the rolling roller 3 without limitation, and for the utility model, there are two cases, one is: according to the length that extrusion case 9 can be operated, different solvents are coated respectively on the release paper of corresponding length, and every coating one deck solvent, the accessible sets up the fan of platform side and weathers the solvent, perhaps the half-dry that blows, then coats other solvent again, and the solvent that specifically accessible control valve selected to flow into in the water conservancy diversion fill 10. After the coating is finished and the composite adhesive film is dried, the winding roller 3 winds the composite adhesive film until the empty release paper is positioned at the position on the platform 1 corresponding to the running route of the extrusion box 9, the solvent is coated again according to the mode, and the process is circulated. And when the composite adhesive film is processed once, a gap is reserved between the adjacent composite adhesive films, and the gap is beneficial to tearing the composite adhesive film from the release paper. At this moment, the tension roller 20 close to the rolling roller 3 can extrude the composite adhesive film, so that the layers on the composite adhesive film are better combined.

The other one is: after the primary composite adhesive film is processed in the above manner, the third motor is started, 34 the processed composite adhesive film is wound on the winding roller 3, and then cutting is performed. At this moment, the adsorption mechanism moves to the position close to the rolling roller 3 and is started to adsorb and fix the release paper. Then, the next round of processing composite adhesive film is carried out, after the processing is finished, the telescopic mechanism 33 is started, so that the composite adhesive film is adhered to the winding roller 3, and the processing is circulated. Or, after the composite adhesive film is processed, the composite adhesive film is cut, and then the third motor 34 winds the composite adhesive film on the winding roller 3. At this moment, adsorption device moves to the position that is close to from type membrane roller 2 to start, hold fixedly with the type membrane, then drag the type paper to the below of rolling roller 3, compound glued membrane processing accomplishes the back, starts telescopic machanism 33, makes compound glued membrane glue on rolling roller 3, so the cycle processing can. In the above mode, the processing production of the composite adhesive film can be realized by adopting any mode. The layer structure of the final composite adhesive film can be seen with reference to fig. 4.

It should be noted that: when the winding roller 3 needs to be dismounted, the belt on the belt wheel is only required to be dismounted, and the roller shaft 32 is only required to be pulled out, and the roller shaft and the bearing on the telescopic rod 31 and the bearing on the telescopic mechanism 33 are not fixed, so that the roller shaft can be dismounted. The telescopic mechanism 33 does not affect the pulley when moving downward. Because roller 32 and rolling roller 3 are not fixed, consequently, in order to avoid roller 32 to rotate, rolling roller 3 does not rotate, is provided with several spacing strip 35 along its length direction on the lateral wall of roller 32, and rolling roller 3 is provided with the spacing groove with spacing strip 35 looks adaptation on the inner wall in the shaft hole that roller 32 passed altogether to make rolling roller 3 block on roller 32, simultaneously, also do not influence rolling roller 3 and take off.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (10)

1. The utility model provides a device is used in production of compound glued membrane, includes platform (1), its characterized in that: platform (1) is provided with from type membrane roller (2) and rolling roller (3) along its length direction's symmetry on the mesa, be provided with reciprocating motion's extrusion mechanism between type membrane roller (2) and rolling roller (3), the ascending bilateral symmetry of platform (1) length direction is provided with linear slide rail (4), be provided with slider (5) of adaptation on slide rail (4), extrusion mechanism passes through mount (6) and fixes on slider (5), extrusion mechanism is through setting up first lead screw (7) of the bottom of platform (1) and first screw (8) drive of complex with it extrusion mechanism reciprocating motion.

2. The device for producing composite adhesive film according to claim 1, wherein: the extruding mechanism comprises an extruding box (9), a flow guide hopper (10) arranged at the bottom of the extruding box (9) and an extruding head (11) which is flat and arranged at the bottom of the flow guide hopper (10), wherein the width of a cavity in the extruding head (11) is gradually reduced from the joint of the extruding head and the flow guide hopper (10) towards the direction of a table board of the platform (1).

3. The device for producing composite adhesive film according to claim 2, wherein: divide into several solvent chamber (13) through several baffle (12) in extrusion case (9), every the bottom of solvent chamber (13) is provided with drain pipe (14), be provided with the valve on drain pipe (14).

4. The device for producing composite adhesive film according to claim 3, wherein: a baffle (15) is transversely arranged in the extrusion box (9), and the liquid outlet pipe (14) penetrates through the baffle (15) and is sealed with the baffle (15).

5. The device for producing composite adhesive film according to claim 4, wherein: the side wall of the flow guide hopper (10) close to the extrusion box (9) is communicated with a booster pump (16) through a pipeline, and the booster pump (16) is fixed on the side wall of the extrusion box (9).

6. The device for producing composite adhesive film according to claim 1, wherein: the bottom surface symmetry of platform (1) is provided with backup pad (17), the both ends of first lead screw (7) are fixed through the bearing with backup pad (17) respectively, wherein one end of first lead screw (7) is stretched out backup pad (17) and is outer and be fixed with first motor (18), the symmetry is provided with link (19) on the lateral wall of first screw (8), the other end of link (19) is fixed respectively on slider (5).

7. The device for producing composite adhesive film according to claim 6, wherein: the utility model discloses a platform, including platform (1), adsorption apparatus, support plate (24), second lead screw (25), support plate (17), strip hole (21) have been seted up along its length direction's center department, be provided with adsorption apparatus in strip hole (21), adsorption apparatus is including setting up in strip hole (21) and open-top's adsorption cover (22), the bottom intercommunication of adsorption cover (22) has miniature aspirator pump (23), the other end of miniature aspirator pump (23) is fixed on second screw (24), it is provided with second lead screw (25) to run through on second screw (24), the both ends of second lead screw (25) respectively with it is fixed that backup pad (17) pass through the bearing, wherein one end of second lead screw (25) is stretched out backup pad (17) and is fixed with second motor (26), second lead screw (25) are located the top of first lead screw (7).

8. The device for producing composite adhesive film according to claim 7, wherein: the trachea of miniature aspirator pump (23) is gone up the cover and is established and be fixed with guide block (27), guide block (27) are located bar hole (21) and with the ascending lateral wall contact of bar hole (21) width direction.

9. The device for producing composite adhesive film according to claim 2, wherein: the extrusion head is characterized in that guide grooves (28) which are parallel to each other are formed in the table top of the platform (1) along the length direction of the platform, and the distance between the two guide grooves (28) is larger than or equal to the length of the extrusion head (11).

10. The device for producing composite adhesive film according to claim 1, wherein: the winding roller (3) is fixed on the platform (1) through symmetrically arranged fixing plates (29), waist-shaped holes (30) are vertically formed in the fixing plates (29), telescopic rods (31) are vertically arranged in the waist-shaped holes (30), bearings are fixed to the other ends of the telescopic rods (31), roller shafts (32) of the winding roller (3) respectively penetrate through the bearings on the telescopic rods (31), at least one ends of the roller shafts (32) extend out of the fixing plates (29) and are connected with telescopic mechanisms (33) through the sleeved bearings, and the telescopic mechanisms (33) are fixed on the fixing plates (29); and one end of the roll shaft (32) extending out of the fixing plate (29) is connected with a third motor (34) through a belt wheel.

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