A fully automatic packaging bag integrated production line

Abstract

The application relates to the technical field of packaging bag production, and discloses a full-automatic packaging bag integrated production line, which comprises a film blowing machine, a printing machine, a cutting machine and a conveyor, and further comprises transfer mechanisms, a cooling mechanism and a mechanical arm; the two transfer mechanisms are arranged between the film blowing machine and the printing machine and between the printing machine and the cutting machine respectively and are used for transferring the packaging bags; the transfer mechanism comprises a frame body and conveying rollers; the conveying rollers are arranged in multiple numbers and are rotationally connected to the frame body through rotating shafts; the cooling mechanism and the transfer mechanism are matched to cool the packaging bags after film blowing; the mechanical arm is arranged between the cutting machine and the conveyor; a clamping assembly is arranged on the mechanical arm and is used for clamping and transferring the packaging bags after cutting; through the technical scheme, the problem that the packaging bag production processes are independent of each other and need manual participation in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging bag production, in particular to a full-automatic packaging bag integrated production line. BACKGROUND

[0002] Plastic packaging bags are a kind of packaging bags for various products in daily life, which are made of plastic as raw material, and are widely used in daily life and industrial production. The production process of plastic packaging bags generally includes film blowing, gravure printing, storage, heat sealing, cutting and packaging.

[0003] At present, each process exists independently, and the transfer of packaging bags between processes is realized through winding and unwinding and manual participation, so the processing efficiency is low. Therefore, we propose a full-automatic packaging bag integrated production line, which can organically combine each process of packaging bag production and reduce manual participation to realize automatic production of packaging bags. SUMMARY

[0004] The present application proposes a full-automatic packaging bag integrated production line, which solves the problem of mutual independence between each process of packaging bag production in the prior art and the need for manual participation.

[0005] The technical scheme of the present application is as follows: a full-automatic packaging bag integrated production line, comprising a film blowing machine, a printing machine, a cutting machine and a conveyor, further comprising:

[0006] A transfer mechanism is provided, two transfer mechanisms are provided, and the two transfer mechanisms are respectively arranged between the film blowing machine and the printing machine and between the printing machine and the cutting machine, for transferring packaging bags, and the transfer mechanism comprises:

[0007] A frame body;

[0008] A conveying roller is provided, the conveying roller is provided with a plurality of conveying rollers, and the conveying roller is rotatably connected to the frame body through a rotating shaft;

[0009] A cooling mechanism is provided, the cooling mechanism and the transfer mechanism cooperate to cool the packaging bags, and the cooling mechanism comprises:

[0010] A water cooler;

[0011] A communication pipe, the conveying roller and the rotating shaft are hollow structures, and the plurality of rotating shafts are communicated through the communication pipe;

[0012] A water inlet pipe and a water outlet pipe, the water cooler is communicated with the plurality of rotating shafts through the water inlet pipe and the water outlet pipe;

[0013] A mechanical arm is provided between the cutting machine and the conveyor, the mechanical arm is provided with a clamping assembly, and the mechanical arm is used for clamping and transferring the cut packaging bags.

[0014] In order to improve the cooling effect of the packaging bag after blowing film, an auxiliary cooling assembly is further included, and the auxiliary cooling assembly comprises:

[0015] Support frames are provided with two, which are located at both ends of the frame body;

[0016] Fans are provided with two, which are in one-to-one correspondence with the support frames, and are installed on the support frames.

[0017] In order to further improve the cooling effect of the packaging bag, the fan is rotatably arranged on the support frame through a driving assembly, and the driving assembly comprises:

[0018] A driving rod is fixedly connected with the fan, and is rotatably connected with the support frame;

[0019] A driving frame is movably arranged on the frame body;

[0020] Driving racks are provided with two, which are fixedly connected with the driving frame;

[0021] Driven gears are provided with two, which are in one-to-one correspondence with the driving rods, are coaxially fixedly connected with the driving rods, are in one-to-one correspondence with the driving racks, and are engaged with the driving racks.

[0022] In order to clean the packaging bag, a dust collection mechanism is further included, and the dust collection mechanism comprises:

[0023] A dust collection box;

[0024] A vacuum pump is in communication with the dust collection box;

[0025] An air suction hood is fixedly connected with the frame body, is in communication with the dust collection box, and a plurality of dust suction openings are formed in the frame body.

[0026] In order to ensure the flatness of the packaging bag, a flattening mechanism is arranged on the frame body, and a plurality of flattening mechanisms are arranged for flattening the packaging bag, and the flattening mechanism comprises:

[0027] Fixed plates are provided with two, which are fixedly connected with the frame body;

[0028] Tensioning frames are arranged on the fixed plates through tensioning springs and telescopic rods;

[0029] Pressing frames are arranged on the tensioning frames through pressing springs and telescopic rods.

[0030] A compression roller is rotatably arranged on the compression frame, and the compression roller is in contact with the conveying roller.

[0031] The working principle and advantages of the present application are as follows:

[0032] 1. In the present application, plastic particles are blown into a film-shaped packaging bag by a film blowing machine. The packaging bag passes through the conveying roller and enters the inside of the printing machine. The surface of the packaging bag is printed by the printing machine. The printed packaging bag passes through the conveying roller and enters the inside of the cutting machine. The continuous packaging bag is cut into a single packaging bag by the cutting machine. Then, the packaging bag is clamped and transferred to the conveyor by the clamping assembly driven by the mechanical arm for packaging and conveying.

[0033] 2. In the present application, the packaging bag after film blowing or printing passes through a plurality of conveying rollers. The packaging bag is tensioned and conveyed by the plurality of conveying rollers. The packaging bag is compressed on the surface of the conveying roller by the compression roller. The packaging bag is flattened by the tension spring and the compression spring driving the compression roller. The packaging bag is tightly attached to the conveying roller. The lifting of the rotating roller adapts to the tension of the packaging bag. The rotating roller is compressed on the top of the packaging bag, so that the packaging bag is in a tensioned state, which is convenient for conveying and subsequent processing of the packaging bag.

[0034] 3. In the present application, cold water is produced by the water chiller and is conveyed to the inside of the plurality of conveying rollers through the water inlet pipe. The packaging bag after film blowing at a high temperature is cooled. The upper and lower surfaces of the packaging bag are air-cooled by the fan. The driving rack is driven by the driving frame to move. The driven gear and the driving rod are driven to rotate. The fan is driven to rotate. The air-cooling range of the fan is expanded. The cooling effect of the packaging bag is improved. The deformation of the packaging bag is reduced. The quality of the packaging bag is ensured.

[0035] 4. In the present application, while the fan air-cools and cools the packaging bag, the dust and impurities on the surface of the packaging bag can be blown away. The vacuum pump pumps the dust box. The air in the range of the frame is pumped by the air suction cover. The dust is sucked into the inside of the dust box for collection.

[0036] 5. Therefore, compared with the packaging bag production equipment in the prior art, the present application combines a plurality of independent devices by the conveying roller to form a complete production line. The packaging bag after cutting is transferred by the mechanical arm. The cold water is conveyed to the inside of the conveying roller by the water chiller to cool the packaging bag. The fan air-cools and cools the packaging bag and provides dust protection. The packaging bag is flattened and tensioned by the compression roller and the tensioning roller to ensure the production quality of the packaging bag. BRIEF DESCRIPTION OF DRAWINGS

[0037] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0038] Figure 1 Structure diagram of the first perspective of the present application;

[0039] Figure 2 Structure diagram of the second perspective of the present application;

[0040] Figure 3 Structure diagram of the transport mechanism, cooling mechanism, auxiliary cooling assembly and lifting mechanism of the present application;

[0041] Figure 4 Structure diagram of the transport mechanism, cooling mechanism, auxiliary cooling assembly and dust collection mechanism of the present application;

[0042] Figure 5 Structure diagram of the conveying roller and cooling mechanism of the present application;

[0043] Figure 6 Structure diagram of the auxiliary cooling assembly and driving assembly of the present application;

[0044] Figure 7 Structure diagram of the dust collection mechanism of the present application;

[0045] Figure 8 Structure diagram of the film blowing machine of the present application;

[0046] Figure 9 Structure diagram of the printing machine of the present application;

[0047] Figure 10 Structure diagram of the cutting machine of the present application;

[0048] Figure 11 Structure diagram of the mechanical arm and clamping assembly of the present application;

[0049] Figure 12 Structure diagram of the present application Figure 5 Structure diagram of the present application

[0050] In the figure:

[0051] 1, film blowing machine; 2, printing machine; 3, cutting machine; 4, conveying machine; 5, mechanical arm;

[0052] 101, frame body; 102, conveying roller; 103, rotating shaft;

[0053] 201, water chiller; 202, communication pipe; 203, water inlet pipe; 204, water outlet pipe;

[0054] 301, fixed clamping frame; 302, movable clamping frame; 303, electric cylinder one; 304, clamping plate; 305, blanking plate;

[0055] 401. Support frame; 402. Fan;

[0056] 501. Drive rod; 502. Drive frame; 503. Drive rack; 504. Driven gear; 505. Electric cylinder two;

[0057] 601. Dust collection box; 602. Vacuum pump; 603. Evacuation hood;

[0058] 701. Fixing plate; 702. Tensioning frame; 703. Pressing frame; 704. Pressure roller; 705. Anti-slip mat;

[0059] 801. Fixed frame; 802. Slider; 803. Rotary roller;

[0060] 901, Electric Cylinder Three. Detailed Implementation

[0061] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0062] like Figures 1 to 12 As shown, this embodiment proposes a fully automated integrated packaging bag production line, including a blown film machine 1, a printing machine 2, a cutting machine 3, and a conveyor 4, as well as a transfer mechanism, a cooling mechanism, and a robotic arm 5. Compared with existing packaging bag production equipment, this invention organically combines multiple independent devices through a conveyor roller 102 to form a complete production line. At the same time, the robotic arm 5 transfers the cut packaging bags. During the conveying process of the packaging bags by the conveyor roller 102, a chiller 201 delivers cold water to the inside of the conveyor roller 102 to cool the packaging bags. Simultaneously, a fan 402 provides air cooling and dust removal protection for the packaging bags. The pressure roller 704 and tension roller level and tension the packaging bags to ensure the production quality of the packaging bags.

[0063] The film blowing machine 1 adds dry plastic particles into the hopper, and the particles enter the screw by their own weight. When the particles contact the screw thread, the rotating thread surface generates a vertical thrust on the plastic, pushing the particles forward. During the process, the plastic is gradually melted due to friction between the plastic and the screw, friction between the plastic and the cylinder, and collision between the particles. Meanwhile, the cylinder is heated externally. The molten plastic is filtered through the head, and then it comes out of the die. The film is cooled by the air ring, blown up by the herringbone plate and traction roller, and then rolled into a sheet. The printing machine 2 includes a printing roller with a printing pattern. During the rotation and traction of the packaging bag, the pattern is printed on the surface of the packaging bag. The cutting machine 3 includes a cutting knife driven by a cylinder and a transmission device to cut the continuous packaging bag intermittently, and then cut into individual bags.

[0064] The transfer mechanism is provided with two, which are respectively arranged between the film blowing machine 1 and the printing machine 2, and between the printing machine 2 and the cutting machine 3, for transferring the packaging bag. The transfer mechanism includes a frame 101 and a plurality of conveying rollers 102 connected to the frame 101 by rotating shafts 103. The packaging bag is tensioned by the conveying rollers 102 to keep it flat, and then transferred by the rotation of the conveying rollers 102. The film-blowing packaging bag is transferred to the inside of the printing machine 2, and the printed packaging bag is transferred to the inside of the cutting machine 3. The printing machine 2 and the cutting machine 3 are also provided with a plurality of rollers, which also tension and flatten the packaging bag to reduce wrinkles.

[0065] The cooling mechanism and the transfer mechanism cooperate to cool the packaging bag. The cooling mechanism includes a cold water machine 201, a communication pipe 202, an inlet pipe 203, and an outlet pipe 204. The conveying rollers 102 and the rotating shafts 103 are hollow structures, and the rotating shafts 103 are connected by the communication pipe 202. The cold water machine 201 is connected to the rotating shafts 103 by the inlet pipe 203 and the outlet pipe 204. The cold water machine 201 produces cold water and sends it to the inside of the conveying rollers 102 through the inlet pipe 203 to cool them down, thereby cooling the packaging bag. The film blowing machine 1 blows the molten plastic into a film shape, and the packaging bag has a high temperature after being blown. The conveying rollers 102 cool the packaging bag to reduce deformation and ensure the accuracy of the subsequent printing and cutting processes.

[0066] The mechanical arm 5 is arranged between the cutting machine 3 and the conveyor 4, and a clamping assembly is arranged on the mechanical arm 5, which is used for clamping and transferring the cut packaging bag, and the clamping assembly comprises a fixed clamping frame 301 and a movable clamping frame 302. The fixed clamping frame 301 is fixedly connected to the movable end of the mechanical arm 5, and the movable clamping frame 302 is movably arranged on the fixed clamping frame 301. An electric cylinder 1 303 is installed on the fixed clamping frame 301, and the movable clamping frame 302 is fixedly connected to the output end of the electric cylinder 1 303. A plurality of clamping plates 304 are fixedly connected to the fixed clamping frame 301 and the movable clamping frame 302. A drop plate 305 is fixedly connected to the outlet of the cutting machine 3, and a plurality of clamping openings matched with the clamping plates 304 are formed in the drop plate 305. The clamping assembly can be moved to the drop plate 305 by the mechanical arm 5, and the cut packaging bag is accumulated at the drop plate 305. The clamping plates 304 are located at the clamping opening positions. The movable clamping frame 302 is lowered to be close to the fixed clamping frame 301 by the electric cylinder 1 303, the packaging bag is clamped by the clamping plates 304, and then the packaging bag is moved to the conveyor 4 by the mechanical arm 5 to be packed.

[0067] To improve the cooling effect on the packaging bag after blowing film, an auxiliary cooling assembly is further included. The auxiliary cooling assembly comprises a support frame 401 and a fan 402. Two support frames 401 are arranged, and the support frames 401 are located at both ends of the frame body 101. Two fans 402 are arranged, and the fan 402 corresponds to the support frame 401 one by one. The fan 402 is installed on the support frame 401. The conveying roller 102 is blown by the fan 402 to air-cool and cool the upper and lower surfaces of the packaging bag, thereby improving the cooling effect on the packaging bag.

[0068] In order to further improve the cooling effect of the packaging bag, the fan 402 is rotatably arranged on the support frame 401 through a driving assembly. The driving assembly comprises a driving rod 501, a driving frame 502, a driving rack 503 and a driven gear 504. The driving rod 501 is fixedly connected with the fan 402 and rotatably connected with the support frame 401. The driving frame 502 is movably arranged on the frame body 101. An electric cylinder two 505 is installed on the frame body 101. The driving frame 502 is fixedly connected with the output end of the electric cylinder two 505. Two driving racks 503 are arranged. The driving racks 503 are fixedly connected with the driving frame 502. Two driven gears 504 are arranged. The driven gears 504 correspond to the driving rods 501 one by one. The driven gears 504 are coaxially fixedly connected with the driving rods 501. The driven gears 504 correspond to the driving racks 503 one by one. The driven gears 504 are engaged with the driving racks 503. The driving frame 502 and the two driving racks 503 can be driven to move by the electric cylinder two 505, so as to drive the driven gears 504 and the driving rods 501 to rotate, so that the fan 402 swings, the blowing area of the fan 402 is expanded, the cooling effect of the packaging bag is further improved, and the dust and impurities on the surface of the packaging bag and around the packaging bag are blown to both sides of the packaging bag, so that the packaging bag is blown.

[0069] In order to clean the packaging bag, a dust collection mechanism is further arranged. The dust collection mechanism comprises a dust collection box 601, a vacuum pump 602 and an air exhaust hood 603. The vacuum pump 602 is communicated with the dust collection box 601. The air exhaust hood 603 is fixedly connected with the frame body 101. The air exhaust hood 603 is communicated with the dust collection box 601. A plurality of dust suction openings are formed in the frame body 101. The vacuum pump 602 is used to exhaust air to the inside of the dust collection box 601, so that air is sucked at the conveying roller 102 through the air exhaust hood 603. In cooperation with the fan 402, the dust and impurities at the packaging bag are sucked into the inside of the dust collection box 601 for collection. A dustproof filter screen is arranged at the communication position of the vacuum pump 602 and the dust collection box 601, so as to prevent dust from entering the vacuum pump 602 and causing damage. A cleaning opening is formed in the dust collection box 601. A cleaning plate is detachably connected with the cleaning opening. The dust in the dust collection box 601 can be cleaned out by regularly opening the cleaning plate.

[0070] In order to ensure the flatness of the packaging bag, the leveling mechanism is arranged on the frame body 101, and the leveling mechanism is arranged in multiple, which is used for leveling the packaging bag, and the leveling mechanism comprises a fixed plate 701, a tensioning frame 702, a pressing frame 703 and a compression roller 704, the fixed plate 701 is provided with two, the fixed plate 701 is fixedly connected on the frame body 101, the tensioning frame 702 is arranged on the fixed plate 701 through the tensioning spring and the telescopic rod, the pressing frame 703 is arranged on the tensioning frame 702 through the pressing spring and the telescopic rod, the compression roller 704 is rotatably arranged on the pressing frame 703, the compression roller 704 is in contact with the conveying roller 102, in order to improve the leveling effect of the packaging bag, the outer part of the compression roller 704 is fixedly sleeved with the antiskid pad 705, the packaging bag is located between the compression roller 704 and the conveying roller 102, the compression roller 704 is tensioned to the two sides of the frame body 101 through the tensioning spring, so that the packaging bag is tensioned, at the same time, the compression roller 704 is driven by the pressing spring to press the packaging bag on the surface of the conveying roller 102, the packaging bag is ensured to be close to the conveying roller 102, the packaging bag is in a tensioned state, the flatness of the packaging bag is ensured, and the resistance of the packaging bag moving is reduced through the rotation of the compression roller 704.

[0071] In order to adapt to the tension of the packaging bag, the tension adjusting assembly is further arranged, the tension adjusting assembly is arranged in two, the two tension adjusting assemblies are located on the two sides of the frame body 101, the tension adjusting assembly comprises a fixed frame 801, a sliding block 802 and a rotating roller 803, the sliding block 802 is provided with two, the sliding block 802 is slidably connected on the fixed frame 801, the rotating roller 803 is rotatably connected between the two sliding blocks 802, the rotating roller 803 is located above the packaging bag and is in contact with the packaging bag, the packaging bag passes below the rotating roller 803, the rotating roller 803 is pressed on the surface of the packaging bag and tensions the packaging bag, when the tension of the packaging bag is small, the rotating roller 803 is lowered to make the packaging bag bend, the packaging bag is tensioned, at the same time, when the packaging bag is tightened, the rotating roller 803 can be lifted, so that the different tension states of the packaging bag are adapted.

[0072] In order to adapt to the distance between the printing machine 2 and the film blowing machine 1, the bottom of the frame body 101 is provided with a lifting mechanism, which is used for driving the frame body 101 and the conveying roller 102 to lift, the lifting mechanism can be selected as the electric cylinder three 901, the frame body 101 is fixedly connected on the output end of the electric cylinder three 901, the frame body 101 and the conveying roller 102 are driven by the electric cylinder three 901 to lift, so that the conveying roller 102 is located at the appropriate position between the film blowing machine 1 and the printing machine 2, and the packaging bag is pulled and conveyed.

[0073] The working principle or use process of the full-automatic packaging bag integrated production line is as follows:

[0074] The film blowing machine 1 melts and blows the plastic particles into a cylindrical film shape, and rolls the film-shaped packaging bag into a sheet shape through the traction roller. The packaging bag passes through the conveying roller 102 and the compression roller 704 and enters the inside of the printing machine 2. The printing machine 2 performs pattern printing on the packaging bag. After the packaging bag is discharged from the printing machine 2, it passes through the conveying roller 102 and the compression roller 704 again. Then the packaging bag enters the cutting machine 3. The cutting machine 3 cuts the continuous packaging bag into multiple single packaging bags. The packaging bags are stacked on the drop plate 305. The mechanical arm 5 drives the clamping assembly to move to the drop plate 305. The electric cylinder one 303 drives the movable clamping frame 302 to descend. The clamping plate 304 clamps the packaging bag. Then the mechanical arm 5 drives the stacked packaging bag to move to the conveyor 4. The electric cylinder one 303 drives the movable clamping frame 302 to move away from the fixed clamping frame 301. The packaging bag is placed on the conveyor 4. The packaging bag is packaged and transported.

[0075] During the production and transportation of the packaging bag, the water cooler 201 produces cold water and delivers it to the inside of the conveying roller 102 to cool the packaging bag. At the same time, the fan 402 blows air to the packaging bag between the conveying rollers 102 to air-cool the packaging bag. The electric cylinder two 505 drives the drive rack 503 to move, thereby driving the driven gear 504 and the drive rod 501 to rotate, driving the fan 402 to swing, improving the cooling effect of the packaging bag. Under the action of the vacuum pump 602, dust and impurities on the packaging bag are sucked into the inside of the dust collection box 601 for collection. The dust collection box 601 can be cleaned regularly.

[0076] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A fully automatic integrated production line for packaging bags, comprising a film blowing machine (1), a printing machine (2), a cutting machine (3) and a conveyor (4), characterized in that, Further comprising a transfer mechanism, a cooling mechanism and a mechanical arm (5); The transfer mechanism is provided with two, and the two transfer mechanisms are respectively arranged between the film blowing machine (1) and the printing machine (2) and between the printing machine (2) and the cutting machine (3), and are used for transferring the packaging bag, and the transfer mechanism comprises: A frame body (101); A plurality of conveying rollers (102) are arranged, and the conveying rollers (102) are rotatably connected to the frame body (101) through shafts (103); The cooling mechanism and the transfer mechanism cooperate to cool the packaging bag, and the cooling mechanism comprises: A cold water machine (201); A communication pipe (202), the conveying rollers (102) and the shafts (103) are hollow structures, and the plurality of shafts (103) are communicated through the communication pipe (202); A water inlet pipe (203) and a water outlet pipe (204), the cold water machine (201) is communicated with the plurality of shafts (103) through the water inlet pipe (203) and the water outlet pipe (204); The mechanical arm (5) is arranged between the cutting machine (3) and the conveyor (4), a clamping assembly is arranged on the mechanical arm (5), and the clamping assembly is used for clamping and transferring the cut packaging bag; An auxiliary cooling assembly, the auxiliary cooling assembly comprises: Two support frames (401) are arranged, and the support frames (401) are located at both ends of the frame body (101); Two fans (402) are arranged, the fan (402) and the support frame (401) are one-to-one corresponding, and the fan (402) is installed on the support frame (401); The fan (402) is rotatably arranged on the support frame (401) through a driving assembly, and the driving assembly comprises: A driving rod (501) is fixedly connected with the fan (402), and the driving rod (501) is rotatably connected to the support frame (401); A driving frame (502) is movably arranged on the frame body (101); Two driving racks (503) are arranged, and the driving racks (503) are fixedly connected to the driving frame (502); Two driven gears (504) are arranged, the driven gear (504) and the driving rod (501) are one-to-one corresponding, the driven gear (504) is coaxially fixedly connected to the driving rod (501), the driven gear (504) and the driving rack (503) are one-to-one corresponding, and the driven gear (504) and the driving rack (503) are engaged.

2. The fully automatic packaging bag integrated production line according to claim 1, characterized in that, Further comprising a dust collection mechanism, and the dust collection mechanism comprises: A dust collection box (601); A vacuum pump (602) is communicated with the dust collection box (601). An air extraction cover (603) is fixedly connected to the frame body (101), the air extraction cover (603) is communicated with the dust collecting box (601), and a plurality of dust suction ports are formed in the frame body (101).

3. The fully automatic packaging bag integrated production line according to claim 2, characterized in that, The frame body (101) is provided with leveling mechanisms, the leveling mechanisms are provided in plurality, and the leveling mechanisms are used for leveling the packaging bags. A fixing plate (701) is provided in two, and the fixing plate (701) is fixedly connected to the frame body (101); A tensioning frame (702) is arranged on the fixing plate (701) through a tensioning spring and a telescopic rod; A pressing frame (703) is arranged on the tensioning frame (702) through a pressing spring and a telescopic rod; A compression roller (704) is rotatably arranged on the pressing frame (703), and the compression roller (704) is in contact with the conveying roller (102).

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