A multi-layer film laminating machine

Abstract

The application discloses a kind of multilayer film laminating machine, including equipment cabinet, the top of the equipment cabinet is equipped with multiple groups of mounting block, and two mounting blocks in multiple groups of mounting block are equipped with extrusion laminating assembly A between, gas inlet assembly is equipped in the extrusion laminating assembly A, and the extrusion laminating assembly A is equipped with fender shell, the extrusion laminating assembly A includes tube group, laminating wheel and extrusion wheel, the tube group includes outer tube, and inner tube is equipped in the outer tube, the laminating wheel is sleeved on the outer tube and is locked by bolt, the inner tube is communicated with laminating wheel by communicating pipe A, the equipment cabinet is connected with mounting bracket, and fixed bearing shaft, displacement bearing assembly and extrusion laminating assembly B are connected on the mounting bracket.The application can heat multilayer film extrusion laminating position without being able to prevent glue liquid hardening and affect laminating, and also can use heat preservation gas to blow around multilayer film, prevent dust from adhering on film.

Description

Technical Field

[0001] This invention relates to the field of multilayer film laminating machine technology, and more particularly to a multilayer film laminating machine. Background Technology

[0002] Multilayer film laminating machines are used to bond at least three layers of film together to form a complete film. Current multilayer film laminating machines, due to the long lamination time per layer, are prone to hardening of the adhesive at low temperatures, thus affecting the bonding effect between the multilayer films. Therefore, we propose a multilayer film laminating machine to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multilayer film laminating machine.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A multilayer film laminating machine includes a machine housing. Multiple sets of mounting blocks are installed on the top of the machine housing. An extrusion laminating component A is provided between each pair of mounting blocks. The extrusion laminating component A includes a gas inlet component and a baffle. The extrusion laminating component A includes a tube assembly, a laminating wheel, and an extrusion wheel. The tube assembly includes an outer tube with an inner tube inside. The laminating wheel is fitted onto the outer tube and locked with bolts. The inner tube and the laminating wheel are connected via a connecting pipe A. A mounting frame is connected to the machine housing, and a fixed bearing shaft, a displacement bearing component, and an extrusion laminating component B are connected to the mounting frame.

[0006] Preferably, a shaft is rotatably inserted through the extrusion wheel, so that the extrusion wheel can rotate outside the shaft, and the two ends of the shaft pass through two mounting blocks in a set of mounting blocks, so that the shaft can rotate between the two mounting blocks;

[0007] An opening is provided on the surface of the outer cylinder, and a positioning ring is fixedly connected to both ends of the bonding wheel. The bonding wheel and the positioning ring are sleeved on the outside of the outer cylinder, and the positioning ring is locked to the surface of the outer cylinder by bolts, which can limit the bonding wheel to the outside of the outer cylinder.

[0008] Preferably, the inner cylinder is movably inserted into the outer cylinder from one end of the outer cylinder, and one end of the outer cylinder is exposed outside the outer cylinder end. The inner cylinder surface has an insertion hole, and the connecting pipe A is located in the opening, with one end of the connecting pipe A inserted into the insertion hole. When the bonding wheel moves on the surface of the outer cylinder, the inner cylinder moves in the outer cylinder, and at the same time, the connecting pipe A moves in the opening. This facilitates the movement of the bonding wheel on the surface of the outer cylinder without causing a failure to provide heat supply and insulation.

[0009] Preferably, the outer ring of the bonding wheel has a bonding groove for accommodating the film to be bonded. The bonding wheel has an annular cavity inside. Both ends of the bonding wheel have several air outlets A and a connecting hole. The other end of the connecting pipe A is rotatably provided with a connector, which is threaded into the connecting hole. In this way, the annular cavity can be connected to the inside of the inner cylinder through the connecting pipe A. Gas enters the inner cylinder and then enters the annular cavity through the connecting pipe A, which can raise the temperature in the annular cavity, thereby keeping the bonding wheel itself at a certain temperature.

[0010] Preferably, the baffle includes connecting rings connected to both ends of the bonding wheel, and each connecting ring is connected to a baffle. Each of the two baffles has a guide ring connected to its opposite face and rests on the outer ring of the baffle. The guide ring is sleeved on the outside of both ends of the bonding wheel. The connecting rings and the baffles are provided with notches to avoid the connecting pipe A. In this way, when the gas fills the annular cavity, it is discharged through the air outlet A. The discharged gas blows between the connecting ring, the baffle and the end of the bonding wheel, and is guided by the guide ring, so that the gas can only blow towards the bonding groove.

[0011] Preferably, the ends of the multiple inner cylinders are connected to an inlet pipe assembly, the inlet pipe assembly including a main pipe for introducing hot air, the end of the main pipe being connected to a secondary pipe, and the end of the secondary pipe being connected to a connecting pipe B, wherein the connecting pipe B is located on the end of the secondary pipe away from the main pipe, the connecting pipe B is connected to a branch pipe, and the end of the branch pipe away from the connecting pipe B is connected to one end of the inner cylinder through an internal threaded sleeve.

[0012] Preferably, the mounting bracket is connected to the side of the equipment housing, and the mounting bracket includes a horizontal bar A and a horizontal bar B, and two vertical bars that are far apart are fixedly connected between the horizontal bar A and the horizontal bar B. One end of the horizontal bar A is fixedly connected to a tail rod for mounting the fixed bearing shaft, wherein the fixed bearing shaft and the tail rod are rotatably connected.

[0013] Preferably, the displacement bearing assembly includes a displacement component and a shaft component. The displacement component includes a concave block that is slidably sleeved on the crossbar B, and the concave block is locked to the crossbar B by bolts. A fixing ring is fixedly connected to the top of the concave block.

[0014] The shaft member includes a rotating cylinder rotatably connected in a fixed ring, and the surface of the rotating cylinder is provided with an air outlet B. One end of the rotating cylinder is connected to one end of the inner cylinder through a connecting pipe C. Furthermore, one end of the connecting pipe C passes through one end of the outer cylinder and extends into the outer cylinder before being threadedly connected to one end of the inner cylinder. The other end of the connecting pipe C is threadedly connected to the end of the rotating cylinder.

[0015] Preferably, the extrusion bonding component B includes a sleeve block sleeved on the surface of one of the vertical rods, and the sleeve block can slide up and down on the vertical rod to adjust its height. Then, the sleeve block is locked on the vertical rod by bolts, and two rotating rods are rotatably connected to the surface of the sleeve block.

[0016] Both of the rotating rods are fitted with extrusion components, each including a sleeve fitted on the rotating rod, and the sleeve surface is provided with a protective sleeve made of rubber.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. It can introduce heated gas into the bonding roller during the bonding process to keep it warm, so that the multilayer film is kept warm or even heated between the bonding roller and the extrusion roller. This prevents the adhesive between the multilayer films from being exposed for too long, which would lead to adhesion and reduced bonding effect, thus affecting the bonding between the multilayer films.

[0019] 2. It can blow air around the bonding wheel by introducing gas into the bonding wheel to prevent dust and other suspended particles from adhering between the multilayer films and affecting the bonding effect.

[0020] 3. The gas is reused and guided from the inner cylinder to the rotating drum before being blown out, thus preventing dust and other suspended particles from adhering to the membrane on the rotating drum. Attached Figure Description

[0021] Figure 1 Axial view of a multilayer film laminating machine proposed in this invention Figure 1 ;

[0022] Figure 2 Axial view of a multilayer film laminating machine proposed in this invention Figure 2 ;

[0023] Figure 3 for Figure 2 Detailed diagram of the inner and outer cylinders and mounting blocks;

[0024] Figure 4 for Figure 3 Disassembled diagram of the middle baffle and the bonding wheel;

[0025] Figure 5 for Figure 4 A breakdown diagram of the outer and inner cylinders;

[0026] Figure 6 for Figure 5 A breakdown diagram of the inner and outer cylinders and the bonding wheel;

[0027] Figure 7 for Figure 2 Schematic diagram of the structure on the mounting bracket;

[0028] Figure 8 for Figure 7 Structural breakdown diagram of the mid-displacement bearing component and the extrusion bonding component B.

[0029] In the diagram: 1. Equipment housing; 2. Mounting block; 3. Extrusion wheel; 31. Shaft; 4. Outer cylinder; 41. Opening; 5. Inner cylinder; 51. Insertion hole; 6. Connecting pipe A; 61. Connector; 7. Fitting wheel; 71. Connecting hole; 72. Positioning ring; 73. Air outlet A; 74. Fitting groove; 8. Baffle; 81. Connecting ring; 82. Baffle plate; 83. Guide ring; 9. Inlet pipe assembly; 91. Main pipe; 92. Secondary pipe; 93. Connecting pipe B; 94. Branch pipe. 10. Connector; 101. Mounting bracket; 102. Horizontal bar A; 103. Vertical bar; 104. Horizontal bar B; 105. Tail bar; 11. Fixed bearing shaft; 12. Connecting pipe C; 13. Displacement bearing assembly; 131. Displacement component; 1311. Concave block; 1312. Fixing ring; 132. Shaft component; 1321. Rotating cylinder; 13211. Vent hole B; 14. Sleeve block; 141. Rotating rod; 15. Extrusion component; 151. Sleeve; 152. Protective sleeve. Detailed Implementation

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] Reference Figure 1-8 A multilayer film laminating machine includes a machine housing 1. Multiple sets of mounting blocks 2 are installed on the top of the machine housing 1. An extrusion laminating component A is provided between each two mounting blocks 2. An extrusion laminating component A is provided with a gas inlet component and a baffle 8. The extrusion laminating component A includes a tube assembly, a laminating wheel 7, and an extrusion wheel 3. The tube assembly includes an outer tube 4 and an inner tube 5 inside the outer tube 4. The laminating wheel 7 is sleeved on the outer tube 4 and locked with bolts. The inner tube 5 and the laminating wheel 7 are connected by a connecting pipe A6. A mounting frame 10 is connected to the machine housing 1, and a fixed bearing shaft 11, a displacement bearing component 13, and an extrusion laminating component B are connected to the mounting frame 10.

[0035] Reference Figure 1-8 A multilayer film laminating machine has a shaft 31 that rotates through the extrusion wheel 3, allowing the extrusion wheel 3 to rotate outside the shaft 31. Two mounting blocks 2 of a set of mounting blocks 2 are passed through both ends of the shaft 31, allowing the shaft 31 to rotate between the two mounting blocks 2. An opening 41 is provided on the surface of the outer cylinder 4. Positioning rings 72 are fixedly connected to both ends of the laminating wheel 7. The laminating wheel 7 and the positioning rings 72 are sleeved on the outside of the outer cylinder 4. The positioning rings 72 are locked to the surface of the outer cylinder 4 by bolts, thus confining the laminating wheel 7 to the outside of the outer cylinder 4.

[0036] Reference Figure 1-8 A multilayer film laminating machine has an inner cylinder 5 that is movably inserted into the outer cylinder 4 from one end, with one end of the outer cylinder 5 exposed outside the end of the outer cylinder 4. The inner cylinder 5 has an insertion hole 51 on its surface, and a connecting pipe A6 is located in the opening 41, with one end of the connecting pipe A6 inserted into the insertion hole 41. When the laminating wheel 7 moves on the surface of the outer cylinder 4, the inner cylinder 5 moves in the outer cylinder 4, and at the same time, the connecting pipe A6 moves in the opening 41. This facilitates the movement of the laminating wheel 7 on the surface of the outer cylinder 4 without causing a failure to provide heat and maintain the temperature.

[0037] Reference Figure 1-8 A multilayer film laminating machine is disclosed. A laminating wheel 7 has an outer circumference with a laminating groove 74 for accommodating the films to be laminated. The laminating wheel 7 has an annular cavity inside. Several air vents A73 and a connecting hole 71 are provided on both ends of the laminating wheel 7. A connecting head 61 is rotatably provided at the other end of a connecting pipe A6, and the connecting head is threaded into the connecting hole 71. Thus, the annular cavity is connected to the inner cylinder 5 via the connecting pipe A6. Gas enters the inner cylinder 5 and then enters the annular cavity through the connecting pipe A6, raising the temperature within the annular cavity. This maintains a certain temperature for the laminating wheel 7 itself, thus keeping the films to be laminated and located in the laminating groove 74 warm and preventing the adhesive between the multilayer films from hardening and affecting the lamination effect.

[0038] Reference Figure 1-8 A multilayer film laminating machine has multiple inner cylinders 5 connected to the ends of an inlet pipe assembly 9. The inlet pipe assembly 9 includes a main pipe 91 for introducing hot air, an auxiliary pipe 92 connected to the end of the main pipe 9, and a connecting pipe B93 connected to the end of the auxiliary pipe 92. The connecting pipe B93 is located at the end of the auxiliary pipe 92 away from the main pipe 91. A branch pipe 94 is connected to the connecting pipe B93, and the end of the branch pipe 94 away from the connecting pipe B93 is connected to one end of the inner cylinder 5 through an internal threaded sleeve. Specifically, the internal threaded sleeve is threaded to the end of the inner cylinder 5 located outside the outer cylinder 4. External hot air enters the auxiliary pipe 92 through the main pipe 91, then enters the connecting pipe B93 through the auxiliary pipe 92, then enters the branch pipe 94 through the connecting pipe B93, then enters the inner cylinder 5 through the branch pipe 94, and then enters the annular cavity through the connecting pipe A6 from the inner cylinder 5, thereby increasing the temperature in the annular cavity.

[0039] Reference Figure 1-8 A multilayer film laminating machine has a mounting frame 10 connected to the side of the equipment housing 1. The mounting frame 10 includes a crossbar A101 and a crossbar B103. Two vertical bars 102 are fixedly connected between the crossbar A101 and the crossbar B103. One end of the crossbar A101 is fixedly connected to a tail bar 104 for mounting a fixed bearing shaft 11. The fixed bearing shaft 11 and the tail bar 104 are rotatably connected.

[0040] Reference Figure 1-8 A multilayer film laminating machine includes a displacement bearing assembly 13 comprising a displacement component 131 and a shaft component 132. The displacement component 131 includes a concave block 1311 slidably sleeved on a crossbar B103, and the concave block 1311 is locked to the crossbar B103 by bolts. A fixing ring 1312 is fixedly connected to the top of the concave block 1311. The shaft component 132 includes a rotating cylinder 1321 rotatably connected to the fixing ring 1312, and the surface of the rotating cylinder 1321 is provided with an air vent B13211. One end of the rotating cylinder 1321 is connected to one end of the inner cylinder 5. The inner cylinder 5 and the outer cylinder 6 are connected by a connecting pipe C12. Furthermore, one end of the connecting pipe C12 passes through one end of the outer cylinder 4 and extends into the outer cylinder 45, where it is threadedly connected to one end of the inner cylinder 5. The other end of the connecting pipe C12 is threadedly connected to the end of the rotating cylinder 1321. In this way, the gas entering the inner cylinder 5 can not only enter the annular cavity through the connecting pipe 6, but also enter the rotating cylinder 1321 through the connecting pipe C12, and then be discharged from the rotating cylinder 1321 through the air outlet B13211, thus blowing away the dust and other particles around the rotating cylinder 1321.

[0041] Reference Figure 1-8A multilayer film laminating machine, wherein the extrusion laminating component B includes a sleeve block 14 sleeved on the surface of one of the vertical rods 102, and the sleeve block 14 can slide up and down on the vertical rod 102 to adjust its height, and then the sleeve block 14 is locked on the vertical rod 102 by bolts, and two rotating rods 141 are rotatably connected to the surface of the sleeve block 14, and an extrusion component 15 is sleeved on the surface of both rotating rods 141. The extrusion component 15 includes a sleeve 151 sleeved on the rotating rod 141, and a protective sleeve 152 is provided on the surface of the sleeve 151. The protective sleeve 152 is made of rubber.

[0042] For ease of explanation, the three sets of bonding rollers 7 and extrusion rollers 3 are referred to as the first set of bonding rollers 7 and extrusion rollers 3, the second set of bonding rollers 7 and extrusion rollers 3, and the third set of bonding rollers 7 and extrusion rollers 3, respectively. The three shaft members 132 are referred to as the first shaft member, the second shaft member, and the third shaft member, respectively. In use, the bottom film is fitted onto the fixed bearing shaft 11, and the bottom film is passed through the third set of bonding rollers 7 and extrusion rollers 3, the second set of bonding rollers 7 and extrusion rollers 3, and the first set of bonding rollers 7 and extrusion rollers 3. The surface of the extrusion rollers 3 presses the bottom film into the bonding groove 74. Then, the first layer of film, the second layer of film, and the third layer of film are fitted onto the three shaft members 132, and the third layer of film on the third shaft member is respectively... The first layer of film passes through the third set of bonding rollers 7 and extrusion rollers 3, the second set of bonding rollers 7 and extrusion rollers 3, and the first set of bonding rollers 7 and extrusion rollers 3 and covers the bottom layer film. Then, the second layer of film passes through the second set of bonding rollers 7 and extrusion rollers 3 and the first set of bonding rollers 7 and extrusion rollers 3 and covers the third layer film. Then, the first layer of film passes through the first set of bonding rollers 7 and extrusion rollers 3 and covers the second layer film. The three layers of film and the bottom mold are bonded together between the first set of bonding rollers 7 and extrusion rollers 3. Finally, the bonded three layers of film and the bottom mold pass through the two sleeves 151 and are positioned between the protective sleeves 152. The two protective sleeves 152 press the three layers of film and the bottom mold together to achieve a second compression bonding.

[0043] Reference Figure 1-8 A multilayer film laminating machine includes a housing 8 comprising connecting rings 81 connected to both ends of a laminating wheel 7, with baffles 82 connected to each connecting ring 81. Each baffle 82 has a guide ring 83 connected to its opposite side and rests on the outer edge of the baffle 82. The guide ring 83 is fitted around both ends of the laminating wheel 7. Both the connecting rings 81 and the baffles 82 have notches to allow passage of a connecting pipe A6. When gas fills the annular cavity, it is discharged through an air outlet A73. The discharged gas, after passing between the connecting rings 81, the baffles 82, and the ends of the laminating wheel 7, is guided by the guide rings 83, ensuring that the gas only blows towards the laminating groove 74. This prevents dust and other suspended particles from accumulating around the laminating wheel 7 and adhering to the multilayer film, thus preventing dust and other suspended particles from affecting the laminating effect of the multilayer film.

[0044] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

[0045] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

Claims

1. A multilayer film laminating machine, comprising a machine housing (1), characterized in that, The top of the equipment housing (1) is equipped with multiple sets of mounting blocks (2), and each of the two mounting blocks (2) is provided with a compression bonding component A. The compression bonding component A is provided with a gas inlet component, and the compression bonding component A is provided with a baffle (8). The compression bonding component A includes a tube assembly, a bonding wheel (7) and a compression wheel (3). The tube assembly includes an outer cylinder (4), and an inner cylinder (5) is provided in the outer cylinder (4). The bonding wheel (7) is sleeved on the outer cylinder (4) and locked with bolts. The inner cylinder (5) and the bonding wheel (7) are connected through a connecting pipe A (6). The equipment housing (1) is connected with a mounting frame (10), and the mounting frame (10) is connected with a fixed bearing shaft (11), a displacement bearing component (13) and a compression bonding component B. The inner cylinder (5) is movably inserted into the outer cylinder (4) from one end of the outer cylinder (4), and one end of the outer cylinder (5) is exposed outside the end of the outer cylinder (4). The inner cylinder (5) has an insertion hole (51) on its surface. The connecting pipe A (6) is located in the opening (41), and one end of the connecting pipe A (6) is inserted into the insertion hole (41). The outer ring of the bonding wheel (7) is provided with a bonding groove (74), the inside of the bonding wheel (7) is an annular cavity, and both ends of the bonding wheel (7) are provided with a plurality of air outlet holes A (73) and a connecting hole (71). The other end of the connecting pipe A (6) is rotatably provided with a connector (61), and the connector is threaded into the connecting hole (71); Multiple inner cylinders (5) are connected to an inlet pipe assembly (9) at their ends. The inlet pipe assembly (9) includes a main pipe (91) for introducing hot air. The end of the main pipe (9) is connected to a secondary pipe (92), and the end of the secondary pipe (92) is connected to a connecting pipe B (93). The connecting pipe B (93) is located on the end of the secondary pipe (92) away from the main pipe (91). The connecting pipe B (93) is connected to a branch pipe (94), and the end of the branch pipe (94) away from the connecting pipe B (93) is connected to one end of the inner cylinder (5) through an internal threaded sleeve.

2. The multilayer film laminating machine according to claim 1, characterized in that, The extrusion wheel (3) has a rotating shaft (31) that passes through it, and the two ends of the shaft (31) pass through two of the mounting blocks (2) in a set of mounting blocks (2); The outer cylinder (4) has an opening (41) on its surface. Both ends of the bonding wheel (7) are fixedly connected with positioning rings (72). The bonding wheel (7) and the positioning rings (72) are sleeved on the outside of the outer cylinder (4). The positioning rings (72) are locked to the surface of the outer cylinder (4) by bolts.

3. The multilayer film laminating machine according to claim 1, characterized in that, The baffle (8) includes connecting rings (81) connected to both ends of the bonding wheel (7), and baffles (82) are connected to both connecting rings (81). Guide rings (83) are connected to the opposite sides of the two baffles (82) and pass through the outer ring of the baffles (82). The guide rings (83) are sleeved on the outside of both ends of the bonding wheel (7). Notches are opened on both the connecting rings (81) and the baffles (82) to avoid the connecting pipe A (6).

4. A multilayer film laminating machine according to claim 1, characterized in that, The mounting bracket (10) is connected to the side of the equipment housing (1), and the mounting bracket (10) includes a crossbar A (101) and a crossbar B (103), and two vertical bars (102) are fixedly connected between the crossbar A (101) and the crossbar B (103). One end of the crossbar A (101) is fixedly connected to a tail bar (104) for mounting the fixed bearing shaft (11), and the fixed bearing shaft (11) and the tail bar (104) are rotatably connected.

5. A multilayer film laminating machine according to claim 1, characterized in that, The displacement bearing assembly (13) includes a displacement component (131) and a shaft component (132). The displacement component (131) includes a concave block (1311) that is slidably sleeved on the crossbar B (103). The concave block (1311) is locked to the crossbar B (103) by bolts. A fixing ring (1312) is fixedly connected to the top of the concave block (1311). The shaft member (132) includes a rotating cylinder (1321) rotatably connected in a fixed ring (1312), and the rotating cylinder (1321) has an air outlet B (13211) on its surface. One end of the rotating cylinder (1321) is connected to one end of the inner cylinder (5) through a connecting pipe C (12).

6. A multilayer film laminating machine according to claim 1, characterized in that, The extrusion bonding component B includes a sleeve block (14) sleeved on the surface of one of the vertical rods (102), and two rotating rods (141) are rotatably connected to the surface of the sleeve block (14); Both rotating rods (141) are fitted with extrusion members (15), the extrusion members (15) include sleeves (151) fitted on the rotating rods (141), and the sleeves (151) are provided with protective sleeves (152).

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