A biaxial stretching device for polyimide film

Abstract

The application belongs to the technical field of film processing, and discloses a bidirectional stretching device for polyimide film, which comprises a machine box, two groups of convex roller mechanisms arranged on the top and bottom of the inner side of the machine box, two groups of concave roller mechanisms arranged between the two groups of convex roller mechanisms, a stretching mechanism arranged at one end of the inner side of the machine box, and a stretching mechanism arranged at one end of the inner side of the machine box.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of film processing, and particularly relates to a bidirectional stretching device for polyimide film. BACKGROUND

[0002] The polyimide film is a mainstream film type insulating material, which is prepared by polycondensation of pyromellitic dianhydride and diamine diphenyl ether in a strong polar solvent, casting into a film, and then imidizing. During preparation, the defoamed polyamic acid solution is pressed into the flow die storage tank on the front head to form a liquid film with uniform thickness, and then enters the drying channel for drying. During drying, the air close to the air is sent into the heater by the air blower and preheated to a certain temperature, and then enters the upper and lower drying channels through the pipeline. At this time, the polyamic acid film runs on the steel belt for one cycle, and the clean and dry air is used to evaporate the solvent, and finally becomes a solid film. The film peeled off from the steel belt is stretched by gradient heating and bidirectional stretching, and then is wound by the winding machine. In the existing stretching process, the polyimide film is first preheated and the edges of the film are clamped by a clamp, and then the controller is started to drive the clamp to move, so that the edges of the film are stretched transversely by the clamp, the film is deformed by external force, and then the film is stretched longitudinally by the speed difference between the winding machine and the feeding machine. Thus, the stretched and shaped film can be obtained, and finally the polyimide film products with different thicknesses are obtained.

[0003] At present, the existing stretching equipment cannot realize bidirectional stretching of the film at the same time, and the transverse stretching by the clamp not only has slow operation speed, but also causes the deformation amount of the film to be stretched at different positions to have certain difference, thereby affecting the uniformity of the film thickness, and the shrinkage amount of the film after stretching is also large. SUMMARY

[0004] In view of the defects of the prior art, the purpose of the present application is to provide a bidirectional stretching device for polyimide film, which solves the problems that the existing stretching equipment cannot realize bidirectional stretching of the film at the same time, and the transverse stretching by the clamp not only has slow operation speed, but also causes the deformation amount of the film to be stretched at different positions to have certain difference, thereby affecting the uniformity of the film thickness, and the shrinkage amount of the film after stretching is also large.

[0005] The purpose of the present application can be achieved by the following technical scheme:

[0006] A bidirectional stretching device for polyimide film, comprising a machine box, two groups of convex roller mechanisms are arranged on the inner top and bottom of the machine box, two groups of concave roller mechanisms are arranged between the two groups of convex roller mechanisms, a stretching mechanism is arranged at one end of the inner side of the machine box, and a stretching mechanism is arranged at the other end of the inner side of the machine box.

[0007] The convex roller mechanism comprises a first convex roller, a second convex roller and a third convex roller rotatably connected with the cabinet, and the surfaces of the first convex roller, the second convex roller and the third convex roller are respectively provided with convex parts;

[0008] The concave roller mechanism comprises a first concave roller, a second concave roller and a third concave roller rotatably connected with the side plates at two ends, and the surfaces of the first concave roller, the second concave roller and the third concave roller are respectively provided with inner concave parts matched with the convex parts, and the end portions of the two side plates on the same side are slidably connected with slide rails fixedly connected with the cabinet.

[0009] The telescopic mechanism comprises two rectangular frames arranged between the upper and lower side plates, two connecting rods rotatably connected with each end of the rectangular frame, the other ends of the two connecting rods rotatably connected with the upper and lower side plates, a slide block slidably connected in the rectangular frame and fixedly connected with the cabinet, and a first transmission shaft penetrating between the two rectangular frames and fixedly connected with gears at both ends, and the lower ends of the gears are engaged with a rack fixedly connected with the rectangular frame.

[0010] The stretching mechanism comprises a moving frame, a plurality of limiting columns fixedly connected with the cabinet and slidably connected around the moving frame, and a first rubber roller rotatably connected with the moving frame along the vertical direction at both sides.

[0011] Further, the stretching mechanism further comprises two guide rollers rotatably connected with the corresponding side plates at both ends.

[0012] Further, the first convex roller, the second convex roller and the third convex roller are sequentially arranged from the other end of the cabinet to the end provided with the moving frame, and the first concave roller, the second concave roller and the third concave roller are sequentially arranged from the other end of the cabinet to the end provided with the moving frame, and the first concave roller, the second concave roller and the third concave roller are respectively arranged correspondingly with the first convex roller, the second convex roller and the third convex roller.

[0013] Further, the convex parts comprise a first convex part on the surface of the first convex roller, a plurality of second convex parts on the surface of the second convex roller, and a plurality of third convex parts on the surface of the third convex roller, and the number of the second convex parts is greater than that of the third convex parts; the inner concave parts comprise a first inner concave part on the surface of the first concave roller, a plurality of second inner concave parts on the surface of the second concave roller, and a plurality of third inner concave parts on the surface of the third concave roller, and the number of the second inner concave parts is greater than that of the third inner concave parts; the first convex part is matched with the first inner concave part, the second convex part is matched with the second inner concave part, and the third convex part is matched with the third inner concave part.

[0014] Further, the first transmission mechanism comprises a first motor fixedly connected to the outer wall of the cabinet, a first synchronous pulley fixedly connected to the output end of the first motor, a second synchronous pulley fixedly connected to the end of the first synchronous pulley on the same side of the upper and lower first convex rollers, and a first synchronous belt engaged between the first synchronous pulley and the two second synchronous pulleys.

[0015] Further, the second transmission mechanism comprises a second motor fixedly connected to the outer wall of the cabinet, a worm fixedly connected to the output end of the second motor, a worm gear engaged on the worm, and a first transmission shaft fixedly connected to the worm gear.

[0016] Further, the third transmission mechanism comprises a third motor fixedly connected to the upper end of the moving frame, a second transmission shaft rotatably connected to the upper end of the moving frame, a first sprocket fixedly connected to the output end of the third motor, a second sprocket fixedly connected to the second transmission shaft, a chain engaged between the first sprocket and the second sprocket, a first bevel gear fixedly connected to the two ends of the second transmission shaft, a second bevel gear fixedly connected to the upper and lower ends of the first rubber roller, and the first bevel gear engaged with the second bevel gear at the upper end.

[0017] Further, the moving frame is rotatably connected with a second rubber roller at the upper and lower ends of the two sides, the second rubber roller is fixedly connected with a third bevel gear at the inner end, and the third bevel gear is engaged with the second bevel gear at the lower end.

[0018] Further, the electric push rod is fixedly connected to the outer wall of the cabinet, and the output end of the electric push rod is fixedly connected to the moving frame through the side wall of the cabinet.

[0019] Further, the guide roller comprises a support pipe fixedly connected to the side plate at both ends, a rubber pipe fixedly connected to the outer side of the support pipe, a roller body sleeved on the outer side of the rubber pipe, the two ends of the roller body rotatably connected to the support pipe, a notch formed on the surface of the rubber pipe, a plurality of air vents formed on the surface of the roller body, and a connector fixedly connected to one end of the support pipe and communicated with the internal channel of the support pipe.

[0020] Further, a slot is formed on the side wall of the cabinet, and a cover is hingedly connected to the upper end of the cabinet.

[0021] The nouns, conjunctions, or adjectives involved in the above technical solutions are explained as follows:

[0022] Fixed connection refers to the connection of parts or components after being fixed without any relative movement.

[0023] (1) The detachable connection is to fix the parts together by using screw, spline, wedge pin, etc. This connection mode can be disassembled during maintenance and the parts will not be damaged. However, the specifications of the connecting parts (such as the length of the bolt, key, and wedge pin) must be correct, and the fastening should be appropriate.

[0024] (2) The non-detachable connection mainly refers to welding, riveting, and tenon joint, etc. Since the parts cannot be reused for the second time due to the need of forging, sawing or oxygen cutting during maintenance or replacement, attention should be paid to the process quality, technical detection and remedial measures (such as correction, polishing, etc.) during connection.

[0025] Threaded connection refers to the detachable connection of the connected parts by using threaded parts (or threaded parts of the connected parts).

[0026] Sliding connection refers to the contact between two objects without being fixed, and the two objects can slide relative to each other.

[0027] Rotary connection refers to the connection between parts that allows the parts to rotate relative to each other.

[0028] Advantages of the present application:

[0029] In use, the polyimide film is bent and installed between the convex roller mechanism and the concave roller mechanism from the slot, then the telescopic mechanism is started to lift the polyimide film to contact the convex roller mechanism, at this time, the speed difference between the winding equipment and the feeding equipment can be used to realize the longitudinal stretching of the polyimide film. Since the convex roller mechanism and the concave roller mechanism provide uneven surfaces, when the polyimide film is subjected to longitudinal tension, it can be deformed in the transverse direction. Finally, the electric push rod is started to push the stretching mechanism to contact the polyimide film, and the polyimide film is stretched in the transverse direction again. Since the stretching mechanism is arranged in the middle of the convex roller mechanism and the concave roller mechanism, the polyimide film stretched by the stretching mechanism is stretched again by the convex roller mechanism and the concave roller mechanism, thereby reducing the shrinkage of the stretched polyimide film. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0031] Figure 1 It is a first perspective view of the overall structure of the embodiment of the present application.

[0032] Figure 2 The second perspective view of the overall structure of the embodiment of the present application;

[0033] Figure 3 The second perspective view of the overall structure of the embodiment of the present application;

[0034] Figure 4 The structure diagram of the inside of the case of the embodiment of the present application;

[0035] Figure 5 The structure diagram of the linkage of the concave roller mechanism, the telescopic mechanism and the second transmission mechanism of the embodiment of the present application;

[0036] Figure 6 The structure diagram of the telescopic mechanism of the embodiment of the present application;

[0037] Figure 7 The structure diagram of the linkage of the convex roller mechanism and the first transmission mechanism of the embodiment of the present application;

[0038] Figure 8 The structure diagram of the first convex roller of the embodiment of the present application;

[0039] Figure 9 The structure diagram of the stretching mechanism of the embodiment of the present application;

[0040] Figure 10 The structure diagram of the third transmission mechanism of the embodiment of the present application;

[0041] Figure 11 The structure diagram of the inside of the guide roller of the embodiment of the present application.

[0042] In the figure:

[0043] 1, case; 11, slot; 12, cover;

[0044] 2, convex roller mechanism; 21, first convex roller; 22, second convex roller; 23, third convex roller; 211, first convex part; 221, second convex part; 231, third convex part;

[0045] 3, concave roller mechanism; 31, first concave roller; 32, second concave roller; 33, third concave roller; 34, side plate; 35, slide rail; 311, first inner concave part; 321, second inner concave part; 331, third inner concave part;

[0046] 4, telescopic mechanism; 41, rectangular frame; 42, connecting rod; 43, sliding block; 44, first transmission shaft; 45, gear; 46, rack;

[0047] 5. Tensioning mechanism; 51. Moving frame; 52. Limiting post; 53. First rubber roller; 54. Second rubber roller;

[0048] 6. Guide roller; 61. Support tube; 62. Rubber tube; 63. Roller body; 64. Joint; 611. Vent hole; 621. Notch; 631. Exhaust hole;

[0049] 7. First transmission mechanism; 71. First motor; 72. First synchronous pulley; 73. Second synchronous pulley; 74. First synchronous belt; 75. Third synchronous pulley; 76. Second synchronous belt;

[0050] 8. Second transmission mechanism; 81. Second motor; 82. Worm gear; 83. Worm wheel;

[0051] 9. Third transmission mechanism; 91. Third motor; 92. Second transmission shaft; 93. First sprocket; 94. Second sprocket; 95. Chain; 96. First bevel gear; 97. Second bevel gear; 98. Third bevel gear

[0052] 10. Electric linear actuator. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0055] like Figures 1-11 As shown, a biaxial stretching device for polyimide film includes a housing 1. Two sets of convex roller mechanisms 2 are arranged at the top and bottom of the inner side of the housing 1. Two sets of concave roller mechanisms 3 are arranged between the two sets of convex roller mechanisms 2. A telescopic mechanism 4 connected to the two sets of concave roller mechanisms 3 is arranged between the two sets of concave roller mechanisms 3. A stretching mechanism 5 is arranged at one end of the inner side of the housing 1.

[0056] The convex roller mechanism 2 includes a first convex roller 21, a second convex roller 22 and a third convex roller 23 rotatably connected to the housing 1. The surfaces of the first convex roller 21, the second convex roller 22 and the third convex roller 23 are respectively provided with protrusions.

[0057] The concave roller mechanism 3 comprises a first concave roller 31, a second concave roller 32 and a third concave roller 33, both ends of which are rotatably connected with the side plates 34, and the surfaces of the first concave roller 31, the second concave roller 32 and the third concave roller 33 are respectively provided with concave parts matched with the convex parts, and the end portions of the two side plates 34 on the same side are slidably connected with the slide rails 35 fixedly connected with the machine box 1.

[0058] The telescopic mechanism 4 comprises two rectangular frames 41 arranged between the upper and lower side plates 34, two connecting rods 42 rotatably connected with each end of the rectangular frame 41, the other ends of the two connecting rods 42 being rotatably connected with the upper and lower side plates 34, a sliding block 43 slidably connected in the rectangular frame 41 and fixedly connected with the machine box 1, and a first transmission shaft 44 penetrating between the two rectangular frames 41, the two ends of the first transmission shaft 44 being fixedly connected with gear wheels 45, and the lower ends of the gear wheels 45 being engaged with a gear rack 46 fixedly connected with the rectangular frame 41.

[0059] The stretching mechanism 5 comprises a moving frame 51, the moving frame 51 being slidably connected with limiting columns 52 fixedly connected with the machine box 1 around the moving frame 51, and the two sides of the moving frame 51 being rotatably connected with first rubber rollers 53 along the vertical direction.

[0060] The stretching mechanism 5 comprises a moving frame 51, the moving frame 51 being slidably connected with limiting columns 52 fixedly connected with the machine box 1 around the moving frame 51, and the two sides of the moving frame 51 being rotatably connected with first rubber rollers 53 along the vertical direction.

[0061] A polyimide film (such as Kapton) is used as the substrate of the film. Figure 1The polyimide film is stretched in two directions by driving the first convex rollers 21, the second convex rollers 22 and the third convex rollers 23 to rotate at the same speed and in the same direction. The convex roller mechanism 2 can provide different conveying forces for the curvedly installed polyimide film, thereby reducing the volume of the equipment and achieving good deformation effect of the polyimide film through multiple stretching. The two guide rollers 6 are driven to rotate in opposite directions to stretch the polyimide film on both sides. At this time, the polyimide film can be longitudinally stretched by using the speed difference between the winding equipment and the unwinding equipment (not shown in the figure). Since the convex roller mechanism 2 and the concave roller mechanism 3 provide uneven surfaces, the polyimide film can be deformed in the transverse direction when it is subjected to longitudinal tension. The polyimide film is stretched in the transverse direction again when it is in contact with the convex roller mechanism 2 and the concave roller mechanism 3.

[0062] The convex roller mechanism 2 and the concave roller mechanism 3 are matched, and the convex roller mechanism 2 and the concave roller mechanism 3 are matched. The convex roller mechanism 2 and the concave roller mechanism 3 have different numbers and different radii of the convex parts and the concave parts on the surface, so that the area of the surface is increased. The film can be embedded in the concave-convex structure in the longitudinal stretching, and the transverse stretching can be realized. After the transverse stretching by the first rubber roller 53 on one side of the guide roller 6, the film is stretched and shaped again by the concave-convex structure of the convex roller mechanism 2 and the concave roller mechanism 3 below. In this way, the shrinkage of the stretched film can be reduced.

[0063] In an embodiment of the present application, the first convex roller 21, the second convex roller 22 and the third convex roller 23 are sequentially arranged from the other end of the cabinet 1 to the end provided with the moving frame 51. The first concave roller 31, the second concave roller 32 and the third concave roller 33 are sequentially arranged from the other end of the cabinet 1 to the end provided with the moving frame 51. The first concave roller 31, the second concave roller 32 and the third concave roller 33 are respectively arranged corresponding to the first convex roller 21, the second convex roller 22 and the third convex roller 23.

[0064] In one embodiment of the present application, the convex part includes a first convex part 211 on the surface of the first convex roller 21, a plurality of second convex parts 221 on the surface of the second convex roller 22, a plurality of third convex parts 231 on the surface of the third convex roller 23, and the number of the second convex parts 221 is greater than that of the third convex parts 231; the concave part includes a first concave part 311 on the surface of the first concave roller 31, a plurality of second concave parts 321 on the surface of the second concave roller 32, a plurality of third concave parts 331 on the surface of the third concave roller 33, and the number of the second concave parts 321 is greater than that of the third concave parts 331; the first convex part 211 is matched with the first concave part 311, the second convex part 221 is matched with the second concave part 321, and the third convex part 231 is matched with the third concave part 331.

[0065] In one embodiment of the present application, the first transmission mechanism 7 includes a first motor 71 fixedly connected to the outer wall of the cabinet 1, a first synchronous pulley 72 fixedly connected to the output end of the first motor 71, a second synchronous pulley 73 fixedly connected to the end of the upper and lower first convex rollers 21 on the same side of the first synchronous pulley 72, a first synchronous belt 74 engaged between the first synchronous pulley 72 and the two second synchronous pulleys 73, a third synchronous pulley 75 fixedly connected to the same end of the first convex roller 21, the second convex roller 22 and the third convex roller 23, and a second synchronous belt 76 engaged between the three third synchronous pulleys 75 on the same set of convex roller mechanism 2. The first motor 71 drives the first synchronous pulley 72 to rotate, and through the transmission of the first synchronous belt 74 and the second synchronous pulley 73, the two first convex rollers 21 rotate in the same direction, and through the transmission of the third synchronous pulley 75 and the second synchronous belt 76, the first convex roller 21, the second convex roller 22 and the third convex roller 23 rotate in the same direction.

[0066] In one embodiment of the present application, the second transmission mechanism 8 includes a second motor 81 fixedly connected to the outer wall of the cabinet 1, a worm 82 fixedly connected to the output end of the second motor 81, a worm gear 83 engaged on the worm 82, and the first transmission shaft 44 fixedly connected with the worm gear 83. The second motor 81 drives, through the transmission of the worm 82 and the worm gear 83, the first transmission shaft 44 rotates, and in turn drives the rectangular frame 41 to move, realizes the moving of the upper and lower side plates 34 towards or opposite, and finally realizes the lifting of the concave roller mechanism 3.

[0067] In one embodiment of the present application, a third transmission mechanism 9 is further included, the third transmission mechanism 9 comprises a third motor 91 fixedly connected to the upper end of the moving frame 51, and a second transmission shaft 92 rotatably connected to the upper end of the moving frame 51, the output end of the third motor 91 is fixedly connected with a first sprocket 93, the second transmission shaft 92 is fixedly connected with a second sprocket 94, the first sprocket 93 and the second sprocket 94 are engaged with a chain 95, the two ends of the second transmission shaft 92 are fixedly connected with a first bevel gear 96, the upper and lower ends of the first rubber roller 53 are fixedly connected with a second bevel gear 97, and the first bevel gear 96 is engaged with the second bevel gear 97 at the upper end. The third motor 91 drives the first sprocket 93 to rotate, and through the transmission of the chain 95 and the second sprocket 94, the second transmission shaft 92 is rotated, and through the transmission of the first bevel gear 96 and the second bevel gear 97, the two first rubber rollers 53 are rotated in opposite directions to stretch the polyimide film to both sides.

[0068] In one embodiment of the present application, the upper and lower ends of the moving frame 51 are rotatably connected with a second rubber roller 54, the inner side end of the second rubber roller 54 is fixedly connected with a third bevel gear 98, and the third bevel gear 98 is engaged with the second bevel gear 97 at the lower end. The rotation of the first rubber roller 53 causes the second rubber roller 54 to rotate, and the second rubber roller 54 stretches the polyimide film to both sides, further improving the stretching effect of the polyimide film.

[0069] In one embodiment of the present application, an electric push rod 10 is further included, the electric push rod 10 is fixedly connected to the outer wall of the cabinet 1, and the output end of the electric push rod 10 is fixedly connected with the moving frame 51 through the side wall of the cabinet 1. The electric push rod 10 can push the moving frame 51 to move towards the guide roller 6, so that the first rubber roller 53 and the second rubber roller 54 are in close contact with the polyimide film on the guide roller 6, facilitating the first rubber roller 53 and the second rubber roller 54 to stretch the polyimide film to both sides.

[0070] In one embodiment of the present application, the guide roller 6 comprises a support pipe 61 fixedly connected with the side plate 34 at both ends, a rubber pipe 62 fixedly connected with the outer side of the support pipe 61, a roller body 63 sleeved with the outer side of the rubber pipe 62, both ends of the roller body 63 rotatably connected with the support pipe 61, a notch 621 formed on the surface of the rubber pipe 62, a plurality of air holes 611 formed on the surface of the support pipe 61 and communicated with the inner channel of the support pipe 61, the air holes 611 communicated with the notch 621, a plurality of air exhaust holes 631 evenly distributed on the surface of the roller body 63, and a joint 64 fixedly connected with one end of the support pipe 61 and communicated with the inner channel of the support pipe 61. The joint 64 is connected with an external air source, the gas is discharged from the plurality of air holes 611 when entering the inner channel of the support pipe 61, and the gas is finally discharged through the plurality of air exhaust holes 631 on the surface of the roller body 63. Since the rubber pipe 62 is arranged on the surface of the support pipe 61, the gas can be discharged in a fixed direction, so that the discharged gas can reduce the friction between the polyimide film and the contact part of the surface of the roller body 63, thereby facilitating the first rubber roller 53 and the second rubber roller 54 to stretch the polyimide film to both sides.

[0071] In one embodiment of the present application, the side wall of the cabinet 1 is provided with a slot 11, and the upper end of the cabinet 1 is hingedly connected with a cover body 12. The polyimide film enters the cabinet 1 from the slot 11 at the upper end, and is stretched and pulled out from the slot 11 at the lower end.

[0072] In the description of the present application, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0073] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only illustrative of the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A bidirectional stretching device for polyimide film comprising a cabinet (1), characterized in that, The inside top and bottom of the case (1) are provided with two sets of convex roller mechanisms (2), two sets of concave roller mechanisms (3) are arranged between the two sets of convex roller mechanisms (2), and a telescopic mechanism (4) connected with the two sets of concave roller mechanisms (3) is arranged between the two sets of concave roller mechanisms (3), and one end of the inside of the case (1) is provided with a stretching mechanism (5); The convex roller mechanism (2) comprises a first convex roller (21), a second convex roller (22) and a third convex roller (23) rotatably connected with the case (1), and the surfaces of the first convex roller (21), the second convex roller (22) and the third convex roller (23) are respectively provided with convex portions; The concave roller mechanism (3) comprises a first concave roller (31), a second concave roller (32) and a third concave roller (33) rotatably connected with the side plates (34) at both ends, and the surfaces of the first concave roller (31), the second concave roller (32) and the third concave roller (33) are respectively provided with concave portions matched with the convex portions (24), and the end portions of the two side plates (34) on the same side are slidingly connected with the slide rails (35) fixedly connected with the case (1); The telescopic mechanism (4) comprises two rectangular frames (41) arranged between the upper and lower side plates (34), two connecting rods (42) rotatably connected with each end of the rectangular frame (41), the other ends of the two connecting rods (42) rotatably connected with the upper and lower side plates (34), a sliding block (43) fixedly connected with the case (1) slidingly connected in the rectangular frame (41), a first transmission shaft (44) penetrating between the two rectangular frames (41), and gears (45) fixedly connected with both ends of the first transmission shaft (44), and a rack (46) fixedly connected with the rectangular frame (41) engaged with the lower end of the gear (45); The stretching mechanism (5) comprises a moving frame (51), and the moving frame (51) is slidingly connected with the limiting columns (52) fixedly connected with the case (1) around the moving frame (51), and the first rubber rollers (53) are rotatably connected with the two sides of the moving frame (51) in the vertical direction; It also comprises two guide rollers (6), and the two ends of the guide rollers (6) are rotatably connected with the corresponding side plates (34).

2. The apparatus according to claim 1, wherein The first convex roller (21), the second convex roller (22) and the third convex roller (23) are sequentially arranged from the other end of the case (1) to the end provided with the moving frame (51), the first concave roller (31), the second concave roller (32) and the third concave roller (33) are sequentially arranged from the other end of the case (1) to the end provided with the moving frame (51), and the first concave roller (31), the second concave roller (32) and the third concave roller (33) are respectively arranged correspondingly with the first convex roller (21), the second convex roller (22) and the third convex roller (23).

3. The apparatus according to claim 2, wherein the apparatus is characterized by: The convex part includes a first convex part (211) of the surface of the first convex roller (21), a plurality of second convex parts (221) of the surface of the second convex roller (22), a plurality of third convex parts (231) of the surface of the third convex roller (23), and the number of the second convex parts (221) is greater than that of the third convex parts (231); the concave part includes a first concave part (311) of the surface of the first concave roller (31), a plurality of second concave parts (321) of the surface of the second concave roller (32), a plurality of third concave parts (331) of the surface of the third concave roller (33), and the number of the second concave parts (321) is greater than that of the third concave parts (331); the first convex part (211) is matched with the first concave part (311), the second convex part (221) is matched with the second concave part (321), and the third convex part (231) is matched with the third concave part (331).

4. The apparatus according to claim 1, wherein the apparatus is characterized by: The first transmission mechanism (7) includes a first motor (71) fixedly connected to the outer wall of the cabinet (1), and the output end of the first motor (71) is fixedly connected with a first synchronous pulley (72); the end portions of the upper and lower first convex rollers (21) on the same side of the first synchronous pulley (72) are fixedly connected with second synchronous pulleys (73); the first synchronous pulley (72) and the two second synchronous pulleys (73) are meshed with a first synchronous belt (74); the same end of the first convex roller (21), the second convex roller (22) and the third convex roller (23) is fixedly connected with a third synchronous pulley (75); and the three third synchronous pulleys (75) on the same group of convex roller mechanisms (2) are meshed with a second synchronous belt (76).

5. The apparatus according to claim 1, wherein the apparatus is characterized by: The second transmission mechanism (8) includes a second motor (81) fixedly connected to the outer wall of the cabinet (1), and the output end of the second motor (81) is fixedly connected with a worm (82); the worm (82) is meshed with a worm wheel (83); and the worm wheel (83) is fixedly connected with the first transmission shaft (44).

6. The apparatus according to claim 1, wherein the apparatus is characterized by: The third transmission mechanism (9) includes a third motor (91) fixedly connected to the upper end of the moving frame (51), and a second transmission shaft (92) rotatably connected to the upper end of the moving frame (51); the output end of the third motor (91) is fixedly connected with a first sprocket (93); the second transmission shaft (92) is fixedly connected with a second sprocket (94); the first sprocket (93) and the second sprocket (94) are meshed with a chain (95); the two ends of the second transmission shaft (92) are fixedly connected with first bevel gears (96); the upper and lower ends of the first rubber roller (53) are fixedly connected with second bevel gears (97); and the first bevel gears (96) are meshed with the second bevel gears (97) on the upper end.

7. The apparatus according to claim 6, wherein the apparatus is characterized by: The upper and lower sides of the moving frame (51) are rotatably connected with second rubber rollers (54); the inner side end of the second rubber roller (54) is fixedly connected with a third bevel gear (98); and the third bevel gear (98) is meshed with the second bevel gear (97) on the lower end.

8. The apparatus according to claim 6, wherein the apparatus is characterized by: Also include electric push rod (10), electric push rod (10) is fixedly connected to the outer wall of the cabinet (1), the output end of electric push rod (10) passes through the side wall of cabinet (1) and is fixedly connected with moving frame (51).

9. The apparatus according to claim 1, wherein the apparatus is characterized by: The guide roller (6) comprises a support pipe (61) fixedly connected with the side plates (34) at both ends, a rubber pipe (62) fixedly connected to the outer side of the support pipe (61), a roller body (63) sleeved on the outer side of the rubber pipe (62), both ends of the roller body (63) being rotatably connected with the support pipe (61), a notch (621) being formed on the surface of the rubber pipe (62), a plurality of air holes (611) being formed on the surface of the support pipe (61) and communicating with the internal passage of the support pipe (61), the air holes (611) communicating with the notch (621), and a plurality of evenly distributed air exhaust holes (631) being formed on the surface of the roller body (63).

10. The apparatus according to claim 1, wherein the apparatus is characterized by: The side wall of the cabinet (1) is provided with a slot (11), and the upper end of the cabinet (1) is hingedly connected with a cover body (12).

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