An explosion-proof infrared positive electrode coating machine

Abstract

The present application relates to an explosion-proof infrared positive electrode coating machine, comprising: a frame, an internal working space is formed, and the working space includes a feed end and a discharge end; a conveying assembly, which is used to convey the positive electrode sheet, so that the positive electrode sheet moves from the feed end to the discharge end; a coating device, which is installed in the working space; a drying assembly, which is installed in the working space and is located between the coating device and the discharge end; the drying assembly includes an infrared lamp and a copper alloy coil; the copper alloy coil is sparsely wound on the surface of the infrared lamp, so that the light of the infrared lamp is emitted outward through the gap between each circle of the copper alloy coil; one end of the copper alloy coil is connected to the frame. The present invention can quickly transfer the heat of the infrared lamp, so that the monomethylamine in MP undergoes a reduction reaction to produce nitrogen, reduce the concentration of NMP, and reduce the risk of combustion and explosion from many aspects.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery coating equipment, and in particular to an explosion-proof infrared positive electrode coating machine. Background Art

[0002] In the process of wet coating the positive electrode sheet of the lithium battery, the lithium battery needs to be dried. However, a large amount of organic solvents are required in the pulping process of the positive electrode, among which the mainstream organic solvent is NMP, that is, N-methyl-2-pyrrolidone. Infrared rays have strong penetrating power and can produce thermal effects in objects, thereby achieving the purpose of dehydration and drying. In drying auxiliary equipment, infrared lamps also have energy-saving advantages. However, the ignition point of NMP is 619.15 K, which has an explosion risk, while the surface temperature of infrared lamps usually exceeds 900K, which can theoretically directly ignite most organic solvents. Therefore, the risk of NMP explosion is an important factor affecting the application of infrared lamps in positive electrode coating and drying.

[0003] There are some solutions for reducing the surface temperature of infrared lamps in the prior art. For example, the invention patent with announcement number CN116170904A discloses an explosion-proof infrared lamp heating mechanism, which controls the temperature of the quartz glass of the lamp tube to 500-600°C by coating the lamp tube, so that a small part of the infrared rays emitted by the lamp tube is absorbed by the explosion-proof quartz glass shell, and most of it is transmitted, and the reflector is cooled through the air inlet and outlet to ensure that the temperature of the explosion-proof quartz glass shell is lower than 180°C. However, in this patent, gas is used as a heat transfer medium for cooling, and the thermal conductivity is low, which is difficult to be applied to positive electrode coating and drying equipment. Summary of the invention

[0004] Based on this, it is necessary to provide an explosion-proof infrared positive electrode coating machine, and its specific technical solution is as follows.

[0005] An explosion-proof infrared positive electrode coating machine, comprising:

[0006] A frame, wherein an operating space is formed inside, and the operating space includes a feeding end and a discharging end;

[0007] A conveying assembly, used for conveying the positive electrode sheet, so that the positive electrode sheet moves from the feeding end to the discharging end;

[0008] A coating device is installed in the working space;

[0009] A drying component is installed in the working space and is located between the coating device and the discharge end; the drying component includes an infrared lamp and a copper alloy coil; the copper alloy coil is sparsely wound on the surface of the infrared lamp so that the light of the infrared lamp is emitted outward through the gaps between each turn of the copper alloy coil; one end of the copper alloy coil is connected to the frame.

[0010] Furthermore, the copper alloy coil is a CuFe2P (K65) copper alloy, the thermal conductivity of the copper alloy coil is not less than 180 W / (m·K), and the melting point is greater than 1300K.

[0011] Furthermore, the drying component also includes a lamp housing, the infrared lamp is placed in the lamp housing, and an opening is provided at the bottom of the lamp housing for emitting light from the infrared lamp outward.

[0012] Furthermore, the lamp housing is made of copper alloy, and a silver-plated layer is provided on the surface of the lamp housing.

[0013] Furthermore, the thermal conductivity of the lamp housing is greater than 200 W / (m·K), and the melting point is greater than 1100K.

[0014] Furthermore, a ventilation assembly is also included; the ventilation assembly includes:

[0015] Air duct, installed on the top of the rack;

[0016] A fan is rotatably installed in the air duct;

[0017] An air duct is connected to the air duct and extends through the frame into the working space; the air duct is located between the coating device and the drying component;

[0018] The nozzle is installed on the air duct;

[0019] The driving member is connected to the fan and is used to drive the fan to rotate so that the nozzle sprays airflow.

[0020] Furthermore, a ventilation hole is provided on the top of the air duct, and an exhaust port is provided on the frame.

[0021] Furthermore, it also includes a coating storage device; the coating storage device includes:

[0022] A cylinder body is installed on the top of the frame; the cylinder body is connected to the coating device and is used to transport the coating slurry to the coating device;

[0023] The stirring shaft is rotatably mounted on the cylinder and extends from the outside of the cylinder into the cylinder; the stirring shaft is connected to a driving member, and the driving member drives the stirring shaft to rotate; the fan is drivingly connected to the stirring shaft;

[0024] The stirring blade is connected to the stirring shaft and rotates with the stirring shaft.

[0025] Furthermore, the conveying assembly includes a first roller body, a second roller body and a tension adjustment assembly; the first roller body and the second roller body are respectively located at two ends of the working space; and the tension adjustment assembly is located between the first roller body and the working space.

[0026] Furthermore, the tension adjustment assembly includes a gantry, a threaded rod, a movable frame and a pressure roller; the inner wall of the gantry is provided with a guide groove, and the two ends of the movable frame are respectively installed in the guide groove for movement along the vertical direction; the threaded rod is threadedly connected to the gantry and connected to the movable frame after passing through the gantry, and is used to drive the movable frame to move along the vertical direction; the pressure roller is connected to the movable frame and moves with the movable frame.

[0027] Beneficial effects: The explosion-proof infrared positive electrode coating machine provided by the present invention sparsely winds a copper alloy coil on the surface of an infrared lamp and connects the copper alloy coil to a frame. Without affecting the infrared lamp from emitting light outward, the high thermal conductivity of the copper alloy coil is utilized to quickly transfer the heat of the infrared lamp to the frame, thereby reducing the temperature of the surface of the infrared lamp and thus reducing the risk of combustion and explosion. The property of copper alloy to be oxidized in a high temperature environment is utilized to cause the oxidized copper oxide to undergo a reduction reaction with monomethylamine in NMP to produce nitrogen, thereby reducing the concentration of NMP and further reducing the risk of combustion and explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of the coating machine;

[0030] Figure 2 It is a partial schematic diagram of the coating machine after being cut open;

[0031] Figure 3 is a schematic diagram of a drying component;

[0032] Figure 4 It is a transmission diagram between the stirring shaft and the fan;

[0033] Figure 5 is a schematic diagram of a tension adjustment component;

[0034] Figure 6 for Figure 5 A magnified schematic diagram of area A in the middle.

[0035] Description of reference numerals: 1. bottom plate; 2. frame; 3. coating device; 4. working space; 5. drying component; 6. ventilation component; 7. coating storage device; 8. tension adjustment component; 9. first roller body; 10. second roller body;

[0036] 11. Fixed plate; 12. Second motor;

[0037] 21. Exhaust vent;

[0038] 51. infrared lamp; 52. copper alloy coil; 53. lamp housing;

[0039] 61. air duct; 62. air duct; 63. nozzle; 64. first motor; 65. vent; 66. fan;

[0040] 71. Cylinder; 72. Stirring shaft; 73. Stirring blade; 74. Feed pipe; 75. Mounting frame; 76. Belt;

[0041] 81. Gantry; 82. Threaded rod; 83. Movable frame; 84. Pressing roller; 85. Guide groove; 86. Handle. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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 the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0048] Example

[0049] Reference Figure 1 As shown, this embodiment provides an explosion-proof infrared positive electrode coating machine, including a frame, a conveying assembly, a coating device 3 and a drying assembly 5. The frame includes a base plate 1 and a frame body 2 connected to the base plate 1, and a working space 4 is formed by the base plate 1 and the frame body 2. The working space 4 is used for coating and drying operations. The working space 4 includes a feed end and a discharge end. The conveying assembly is used to convey the positive electrode sheet, so that the positive electrode sheet moves from the feed end to the discharge end. During the movement of the positive electrode sheet, the coating and drying operations of the positive electrode sheet are completed. The coating device 3 is installed in the working space 4 and is used for coating the positive electrode sheet.

[0050] Reference Figure 2 and Figure 3As shown, the drying component 5 is installed in the working space 4 and is located between the coating device 3 and the discharge end, so that the positive electrode plate can be dried after the coating operation is completed during the transportation process. The drying component 5 includes an infrared lamp 51 and a copper alloy coil 52. The copper alloy coil 52 is sparsely wound on the surface of the infrared lamp 51, so that the light of the infrared lamp 51 is emitted outward through the gaps between the turns of the copper alloy coil 52; one end of the copper alloy coil 52 is connected to the frame. The copper alloy coil 52 is wound on the surface of the infrared lamp 51, and can use the high thermal conductivity of the copper alloy coil 52 to conduct heat outward, thereby reducing the temperature of the surface of the infrared lamp 51 and reducing the risk of combustion and explosion when NMP passes through the surface of the infrared lamp 51. When winding the copper alloy coil 52, it is sufficient to ensure that there is a certain gap between each turn to emit infrared light outward, and the specific sparseness can be determined according to actual needs.

[0051] It should be noted that the flash point of NMP is 619.15 K, and the volume ratio of the explosion limit is 1.3-9.5%. Therefore, the solubility of NMP is also an important factor affecting combustion and explosion. In the actual production process of NMP, a certain amount of free amines will remain, mainly monomethylamine. At room temperature, the NMP solvent is relatively stable, but in the drying operation, the high temperature environment generated by the infrared lamp 51 can decompose the free amines in NMP. The free amines have a certain reducibility, and the reducibility of the free amines is greater than that of NMP. In the drying operation, the copper alloy is oxidized at high temperature to form copper oxides, which are reduced to metallic copper by the free amines and produce nitrogen. In fact, copper is used as a catalyst to catalyze the decomposition of free amines to generate nitrogen. The generation of nitrogen leads to a decrease in the solubility of NMP, thereby reducing the risk of combustion and explosion, and nitrogen is generated around the infrared lamp 51, which to a certain extent prevents the probability of NMP contacting the surface of the infrared lamp 51, further reducing the risk of combustion and explosion.

[0052] In addition, by sparsely winding the copper alloy coil 52 on the surface of the infrared lamp 51, it is also possible to reinforce the micro cracks of the lamp tube.

[0053] The explosion-proof infrared positive electrode coating machine provided in this embodiment sparsely winds a copper alloy coil 52 on the surface of an infrared lamp 51 and connects the copper alloy coil 52 to a frame. Without affecting the infrared lamp 51 emitting light outward, the high thermal conductivity of the copper alloy coil 52 is utilized to quickly transfer the heat of the infrared lamp 51 to the frame, thereby reducing the temperature of the surface of the infrared lamp 51 and thus reducing the risk of combustion and explosion. The property of copper alloy to be oxidized in a high temperature environment is utilized to cause the oxidized copper oxide to undergo a reduction reaction with monomethylamine in NMP to produce nitrogen, thereby reducing the concentration of NMP and further reducing the risk of combustion and explosion.

[0054] Specifically, in this embodiment, the copper alloy coil 52 used is CuFe2P (K65) copper alloy, and the thermal conductivity of the copper alloy coil 52 is not less than 180 W / (m·K) and the melting point is greater than 1300K.

[0055] Specifically, the drying component 5 also includes a lamp housing 53, and the infrared lamp 51 is placed in the lamp housing 53. An opening is provided at the bottom of the lamp housing 53 to allow the light of the infrared lamp 51 to be emitted outward. The heat of the infrared lamp 51 can be absorbed by the lamp housing 53 and transferred outward, thereby lowering the temperature in the environment and reducing the risk of combustion and explosion.

[0056] In this embodiment, the lamp housing 53 is made of copper alloy, and a silver-plated layer is provided on the surface of the lamp housing 53. The thermal conductivity of the lamp housing 53 is greater than 200 W / (m·K), and the melting point is greater than 1100 K. The lamp housing 53 is specifically made of brass H96, and copper is used to catalyze the decomposition of free amines to produce nitrogen, thereby further reducing the solubility of NMP, creating a protective atmosphere around the infrared lamp 51, reducing the probability of NMP contacting the infrared lamp 51, and further reducing the risk of combustion and explosion.

[0057] By providing a silver-plated layer on the surface of the lamp housing 53, on the one hand, the thermal conductivity is improved. Silver has a high thermal conductivity of 429 W / (m·K). On the other hand, the excellent reflectivity of silver in the infrared band can be used to reflect infrared light, thereby ensuring the dehydration and drying effect of the positive electrode. In addition, the chemical properties of silver itself are relatively stable. Even if it is oxidized, it will be reduced to elemental silver in a high-temperature drying environment, thereby ensuring the reflection effect of infrared light.

[0058] Specifically, referring to FIG. Figure 2 As shown, a ventilation assembly 6 is also included, and the ventilation assembly 6 includes an air duct 61, a fan 66, an air pipe 62, a nozzle 63 and a driving member. The air duct 61 is installed on the top of the frame, and the fan 66 is rotatably installed in the air duct 61. The air duct 62 is connected to the air duct 61 and extends into the working space 4 through the frame. The air duct 62 is located between the coating device 3 and the drying assembly 5. A plurality of uniformly arranged nozzles 63 are installed on the air duct 62. The driving member is connected to the fan 66 to drive the fan 66 to rotate, so that the nozzle 63 sprays airflow. A ventilation hole is provided at the top of the air duct 61, and an exhaust port 21 is provided on the frame 2, so as to form a flowing airflow from the vent 65 to the inside of the working space 4 to the exhaust port 21, and NMP is discharged outwardly, so as to achieve the purpose of reducing the concentration of NMP, thereby further reducing the risk of combustion and explosion.

[0059] Specifically, refer to Figure 1 and Figure 2As shown, it also includes a coating storage device 7, which includes a barrel 71, a stirring shaft 72 and a stirring blade 73. The barrel 71 is installed on the top of the frame 2, and a feed pipe 74 is provided on the top of the barrel 71. The slurry is injected into the barrel 71 through the feed pipe 74, and the barrel 71 is connected with the coating device 3, so as to convey the coating slurry to the coating device 3. The stirring shaft 72 is rotatably mounted on the barrel 71 and extends from the outside of the barrel 71 into the inside of the barrel 71. The stirring shaft 72 is connected to the driving member, and the stirring shaft 72 is driven by the driving member to rotate. A plurality of stirring blades 73 are connected to the stirring shaft 72, and the stirring blades 73 rotate with the stirring shaft 72 so as to stir the slurry. Moreover, the stirring shaft 72 is also connected to the rotating shaft of the fan 66 in a transmission manner, and can be specifically connected in the form of a belt 76. When the driving member drives the stirring shaft 72 to stir, the fan 66 is driven to rotate to form an airflow.

[0060] Specifically, the driving member is a first motor 64 , and a mounting bracket 75 is connected above the cylinder 71 , so that the first motor 64 is mounted on the mounting bracket 75 to prevent the first motor 64 from idling.

[0061] Specifically, refer to Figure 1 As shown, the conveying assembly includes a first roller body 9, a second roller body 10 and a tension adjustment assembly 8. The first roller body 9 and the second roller body 10 are respectively located at the two ends of the working space 4, that is, the first roller body 9 and the second roller body 10 are respectively installed on the bottom plate 1 and located at the two ends of the frame body 2. The tension adjustment assembly 8 is located between the first roller body 9 and the working space 4. When the coating and drying operation is performed, the positive electrode sheet, that is, the aluminum foil, passes through the first roller body 9, the tension adjustment assembly 8 and the second roller body 10 in sequence to realize the conveying operation of the positive electrode sheet.

[0062] Specifically, two groups of fixed plates 11 are respectively installed on the bottom plate 1, and the first roller body 9 and the second roller body 10 are respectively rotatably installed on the two groups of fixed plates 11. A second motor 12 is installed on one group of fixed plates 11, and the second motor 12 is connected to the first roller body 9 or the second roller body 10, and the roller body is driven by the second motor 12 to rotate, thereby realizing the transportation of the positive electrode sheet.

[0063] Specifically, refer to Figure 5 and Figure 6As shown, the tension adjustment assembly 8 includes a gantry 81, a threaded rod 82, a movable frame 83 and a pressure roller 84. The inner wall of the gantry 81 is provided with a guide groove 85, and the two ends of the movable frame 83 are respectively installed in the guide groove 85 to be movable in the vertical direction. The threaded rod 82 is threadedly connected to the gantry 81 and connected to the movable frame 83 after passing through the gantry 81, and is used to drive the movable frame 83 to move in the vertical direction; the pressure roller 84 is connected to the movable frame 83 and moves with the movable frame 83. The threaded rod 82 and the movable frame 83 can be connected in rotation by means of bearings or the like.

[0064] When the threaded rod 82 is rotated, the movable frame 83 cannot rotate due to the restriction of the guide groove 85, so that the pressure roller 84 moves along the vertical direction with the movable frame 83, thereby adjusting the tension on the positive electrode sheet to avoid defects such as wrinkles on the positive electrode sheet during the coating process. In order to facilitate the rotation of the threaded rod 82, a handle 86 is also connected to the end of the threaded rod 82.

[0065] The working process of this embodiment is as follows: the positive electrode plate is moved by the conveying assembly. During the movement, the coating operation is performed by the coating device 3, and the drying operation is completed by the drying assembly 5. During the drying process, the heat of the infrared lamp 51 is quickly conducted by the copper alloy coil 52 with high thermal conductivity and the lamp housing 53 made of copper alloy to avoid the explosion of NMP caused by excessive temperature. Copper is also used to catalyze the decomposition of free amines contained in NMP to produce nitrogen, dilute the solubility of NMP and provide a protective atmosphere for the infrared lamp 51, reduce the probability of contact between NMP molecules and the infrared lamp 51, and further reduce the risk of explosion.

[0066] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An explosion-proof infrared positive electrode coating machine, characterized in that: include: A frame, wherein an operating space is formed inside, and the operating space includes a feeding end and a discharging end; A conveying assembly, used for conveying the positive electrode sheet, so that the positive electrode sheet moves from the feeding end to the discharging end; A coating device is installed in the working space; A drying component is installed in the working space and is located between the coating device and the discharging end; the drying component includes an infrared lamp and a copper alloy coil; the copper alloy coil is sparsely wound on the surface of the infrared lamp so that the light of the infrared lamp is emitted outward through the gaps between the coils of the copper alloy coil; one end of the copper alloy coil is connected to the frame; The copper alloy coil is a CuFe2P copper alloy, the thermal conductivity of the copper alloy coil is not less than 180 W / (m·K), and the melting point is greater than 1300K.

2. The explosion-proof infrared positive electrode coating machine according to claim 1, characterized in that: The drying component also includes a lamp housing, the infrared lamp is placed in the lamp housing, and an opening is provided at the bottom of the lamp housing for emitting light from the infrared lamp outward.

3. The explosion-proof infrared positive electrode coating machine according to claim 2, characterized in that: The lamp housing is made of copper alloy, and a silver-plated layer is provided on the surface of the lamp housing.

4. The explosion-proof infrared positive electrode coating machine according to claim 3, characterized in that: The thermal conductivity of the lamp housing is greater than 200 W / (m·K), and the melting point is greater than 1100K.

5. The explosion-proof infrared positive electrode coating machine according to claim 1, characterized in that: Also included is a ventilation assembly; the ventilation assembly includes: Air duct, installed on the top of the rack; A fan is rotatably installed in the air duct; An air duct is connected to the air duct and extends through the frame into the working space; the air duct is located between the coating device and the drying component; The nozzle is installed on the air duct; The driving member is connected to the fan and is used to drive the fan to rotate so that the nozzle sprays airflow.

6. The explosion-proof infrared positive electrode coating machine according to claim 5, characterized in that: The top of the air duct is provided with a ventilation hole, and the frame is provided with an exhaust port.

7. The explosion-proof infrared positive electrode coating machine according to claim 5, characterized in that: Also includes a coating storage device; the coating storage device includes: A cylinder body is installed on the top of the frame; the cylinder body is connected to the coating device and is used to transport the coating slurry to the coating device; The stirring shaft is rotatably mounted on the cylinder and extends from the outside of the cylinder into the cylinder; the stirring shaft is connected to a driving member, and the driving member drives the stirring shaft to rotate; the fan is drivingly connected to the stirring shaft; The stirring blade is connected to the stirring shaft and rotates with the stirring shaft.

8. The explosion-proof infrared positive electrode coating machine according to claim 1, characterized in that: The conveying assembly comprises a first roller body, a second roller body and a tension adjustment assembly; the first roller body and the second roller body are respectively located at two ends of the working space; the tension adjustment assembly is located between the first roller body and the working space.

9. The explosion-proof infrared positive electrode coating machine according to claim 8, characterized in that: The tension adjustment assembly includes a gantry, a threaded rod, a movable frame and a pressure roller; the inner wall of the gantry is provided with a guide groove, and the two ends of the movable frame are respectively installed in the guide groove for movement in the vertical direction; the threaded rod is threadedly connected to the gantry and connected to the movable frame after passing through the gantry, and is used to drive the movable frame to move in the vertical direction; the pressure roller is connected to the movable frame and moves with the movable frame.

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