Full-precision double-roller roll coating machine with high roll coating precision

Abstract

The utility model relates to the technical field of roller coating machines, one embodiment of the utility model provides a full-precision double-roller roller coating machine with high roller coating precision, the full-precision double-roller roller coating machine comprises a base, a material conveying mechanism is arranged above the base, and an air blowing mechanism is arranged above the material conveying mechanism. According to the full-precision double-roller roll coating machine, materials are in contact with the positioning plate, so that the push plate extrudes the pressure sensor, and the air pump is driven to blow air; according to the full-precision double-roller roll coating machine with the high roll coating precision, a push plate is in contact with a pressure sensor, so that an air pump runs to clean the surface of a material, and therefore, the air pump can clean the material in time when the material passes through the position below an air outlet, and the roll coating effect of the material during roll coating is improved; and when no material exists above the conveying belt, the air pump is automatically closed, energy loss is reduced, the service life of the blowing mechanism is prolonged, use is convenient, and through the technical scheme, the technical problem of resource waste in related technologies is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of roller coating machine technology, and more specifically, to a fully precision twin-roller roller coating machine with high roller coating accuracy. Background Technology

[0002] "Roller coating machine" is an important piece of equipment in the coating equipment series; it has the advantages of low paint loss, high production efficiency, and simple and convenient maintenance; it can be well integrated with production lines to form a highly automated production line; compared with single roller coating machine, full precision double roller coating machine has significant advantages in coating quality, production efficiency, equipment flexibility, scope of application and cost-effectiveness.

[0003] Traditional high-precision two-roller coating machines have the following drawbacks: During operation, the material needs to be placed on a conveyor belt, which then moves it to the area below the roller assembly for coating. Before reaching the roller assembly, an air blowing mechanism is typically used to clean the material surface and improve the coating effect. However, this air blowing mechanism runs continuously during the coating process, leading to unnecessary energy consumption and equipment wear when the material quantity on the production line is small or when preheating the machine before production. Therefore, improvements are needed. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a high-precision two-roller coating machine, which solves the technical problem of resource waste in related technologies.

[0005] According to one aspect, at least one embodiment of this disclosure provides a high-precision two-roller coating machine, including a base, a material conveying mechanism disposed above the base, an air blowing mechanism disposed above the material conveying mechanism, the air blowing mechanism including a U-shaped frame fixedly installed above the material conveying mechanism, a connecting block fixedly installed on the front side of the U-shaped frame, an air pump fixedly installed above the connecting block, an air inlet pipe fixedly installed on the rear left end of the air pump, an air outlet pipe fixedly installed on the outer side of the U-shaped frame, an air outlet pipe extending into the air outlet pipe fixedly installed on the rear right end of the air pump, an air outlet being provided at the bottom of the air outlet pipe, a groove being provided on the inner side of the U-shaped frame, an mounting block being fixedly installed inside the groove, and a pressure sensor being fixedly installed on the outer side of the mounting block.

[0006] According to another aspect, at least one embodiment of this disclosure also provides a high-precision two-roller coating machine, comprising: a material conveying mechanism including a side plate fixedly installed above a base; two rollers rotatably installed between the inner sides of the side plate; the two rollers being connected by a conveyor belt; strip plates uniformly fixedly installed on the outer side of the conveyor belt; a positioning mechanism provided inside the groove; the positioning mechanism including a round shaft fixedly connected inside the groove; a positioning plate movably sleeved on the outer side of the round shaft; an arc-shaped groove second is provided above the positioning plate; an arc-shaped plate second is movably installed inside the arc-shaped groove second; and a push plate is fixedly installed above the arc-shaped plate second.

[0007] According to another aspect, at least one embodiment of this disclosure also provides a high-precision two-roller coating machine, comprising: a housing fixedly installed above the side plate, a roller assembly rotatably installed inside the housing, a motor assembly fixedly installed on the outside of the housing, and the output end of the motor assembly fixedly connected to the front end of the roller assembly.

[0008] According to another aspect, at least one embodiment of this disclosure also provides a high-precision two-roller coating machine, comprising: a servo motor fixedly mounted on the outer side of the side plate, and the output end of the servo motor fixedly connected to the front end of the first roller.

[0009] According to another aspect, at least one embodiment of this disclosure also provides a high-precision two-roller coating machine, comprising: a control board fixedly mounted on the outer side of the base, the control board being electrically connected to an air pump, and a pressure sensor being electrically connected to the control board.

[0010] According to another aspect, at least one embodiment of this disclosure also provides a high-precision double-roller coating machine, comprising: an arc-shaped groove is provided on the outer side of the circular shaft, and an arc-shaped plate located inside the arc-shaped groove is fixedly installed on the inner side of the positioning plate.

[0011] According to another aspect, at least one embodiment of this disclosure also provides a high-precision twin-roller coating machine, comprising: limiting grooves formed on both sides of the arc-shaped groove two, and arc-shaped limiting plates located inside the limiting grooves fixedly installed on both sides of the arc-shaped plate two.

[0012] According to another aspect, at least one embodiment of this disclosure also provides a high-precision two-roller coating machine, comprising: an arc-shaped spring 2 elastically installed between the inner side of the arc-shaped groove 2 and the inner side of the arc-shaped plate 2, wherein the arc of the arc-shaped spring 2 corresponds to the arc-shaped groove 2.

[0013] According to another aspect, at least one embodiment of this disclosure also provides a high-precision two-roller coating machine, comprising: a pusher plate corresponding to a pressure sensor, and the pressure sensor corresponding to an air pump.

[0014] According to another aspect, at least one embodiment of this disclosure also provides a high-precision two-roller coating machine, comprising: an arc-shaped spring 1 elastically mounted on the inner side of the arc-shaped groove 1, the arc-shaped spring 1 being located on the inner side of the arc-shaped plate 1.

[0015] The beneficial effects of the embodiments disclosed herein are as follows:

[0016] In this disclosure, the material contacts the positioning plate, causing the pusher plate to squeeze the pressure sensor, thereby driving the air pump to blow air. Compared with traditional high-precision double-roller coating machines, this high-precision double-roller coating machine uses the pusher plate to contact the pressure sensor, causing the air pump to clean the surface of the material. This allows the air pump to clean the material in time when it passes under the air outlet, improving the coating effect. When there is no material above the conveyor belt, the air pump automatically shuts off, saving energy consumption, increasing the service life of the blowing mechanism, and making it easy to use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a high-precision two-roller roller coating machine according to one embodiment of the present disclosure;

[0019] Figure 2 This is a schematic diagram of the material conveying mechanism of this utility model;

[0020] Figure 3 This is a schematic diagram of the air blowing mechanism of this utility model;

[0021] Figure 4 This is a vertical cross-sectional view of the present invention;

[0022] Figure 5 for Figure 4 A magnified schematic diagram of the partial structure at point A in the middle;

[0023] Figure 6 This is a schematic diagram of the circular shaft of this utility model;

[0024] Figure 7This is a schematic diagram of the push plate of this utility model.

[0025] In the diagram: 1. Base; 2. Material conveying mechanism; 21. Side plate; 22. Roller 1; 23. Conveyor belt; 24. Strip plate; 25. Servo motor; 3. Housing; 4. Roller assembly; 5. Motor assembly; 6. Air blowing mechanism; 61. U-shaped frame; 62. Connecting block; 63. Air pump; 64. Air inlet pipe; 65. Air outlet pipe; 66. Air outlet pipe; 67. Air outlet; 68. Groove; 7. Control board; 8. Positioning mechanism; 81. Round shaft; 82. Positioning plate; 83. Arc groove 1; 84. Arc plate 1; 85. Arc spring 1; 86. Arc groove 2; 87. Limiting groove; 88. Arc spring 2; 9. Push plate; 10. Arc plate 2; 11. Arc limiting plate; 12. Mounting block; 13. Pressure sensor. Detailed Implementation

[0026] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0027] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0028] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0029] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this disclosure.

[0031] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] like Figures 1 to 7 As shown, a high-precision double-roller coating machine with high coating accuracy is illustrated in one embodiment of this disclosure. It includes a base 1, a material conveying mechanism 2 above the base 1, and an air blowing mechanism 6 above the material conveying mechanism 2. The air blowing mechanism 6 includes a U-shaped frame 61 fixedly installed above the material conveying mechanism 2. A connecting block 62 is fixedly installed on the front side of the U-shaped frame 61. An air pump 63 is fixedly installed above the connecting block 62. An air inlet pipe 64 is fixedly installed on the rear left side of the air pump 63. An air outlet pipe 65 is fixedly installed on the outer side of the U-shaped frame 61. An air outlet pipe 66 extending into the air outlet pipe 65 is fixedly installed on the rear right side of the air pump 63. An air outlet 67 is opened at the bottom of the air outlet pipe 65. A groove 68 is opened on the inner side of the U-shaped frame 61. An installation block 12 is fixedly installed inside the groove 68. A pressure sensor 13 is fixedly installed on the outer side of the installation block 12.

[0033] In some examples, during use, the servo motor 25 and motor group 5 are first started, causing roller 22 and roller group 4 to begin operation. Then, the material is placed above the conveyor belt 23, which moves the material. When the material reaches below the U-shaped frame 61, it contacts the lower end of the positioning plate 82, which is blocked by the arc spring 85. When the strip plate 24 moves to the rear of the material, it pushes the material forward, causing the positioning plate 82 to rotate around the circular shaft 81. This causes the push plate 9 to press against the pressure sensor 13, which then... The overpivot effect converts pressure into an electrical signal. After the control board 7 analyzes the signal, it drives the air pump to run through the relay module. The air pump 63 blows air onto the surface of the material through the air outlet 67. After the material passes through, the arc spring 85 releases its elastic potential energy to push the positioning plate 82 back to its original position, causing the push plate 9 to disengage from the pressure sensor 13, thereby turning off the air pump 63. At this time, the material moves to the bottom of the roller group 4, and the motor group 5 drives the picking roller and coating roller to run. The picking roller picks up paint from the paint tray and transfers the paint to the coating roller. The coating roller is responsible for evenly coating the paint onto the surface of the object.

[0034] The material comes into contact with the positioning plate 82, causing the push plate 9 to squeeze the pressure sensor 13, thereby driving the air pump 63 to blow air. Compared with traditional high-precision double-roller coating machines, this high-precision double-roller coating machine uses the contact between the push plate 9 and the pressure sensor 13 to make the air pump 63 run and clean the surface of the material. This allows the air pump 63 to clean the material in time when it passes under the air outlet 67, improving the coating effect of the material during the coating process. When there is no material above the conveyor belt 23, the air pump 63 automatically shuts off, saving energy consumption, increasing the service life of the blowing mechanism, and making it easy to use.

[0035] like Figures 1 to 7 As shown, this invention discloses a high-precision double-roller coating machine with high coating accuracy in another embodiment. The material conveying mechanism 2 includes a side plate 21 fixedly installed above the base 1. Two rollers 22 are rotatably installed between the inner sides of the side plate 21. The two rollers 22 are connected by a conveyor belt 23. Strip plates 24 are uniformly fixedly installed on the outer side of the conveyor belt 23. A positioning mechanism 8 is provided inside the groove 68. The positioning mechanism 8 includes a round shaft 81 fixedly connected inside the groove 68. A positioning plate 82 is movably sleeved on the outer side of the round shaft 81. An arc-shaped groove 86 is provided above the positioning plate 82. An arc-shaped plate 10 is movably installed inside the arc-shaped groove 86. A push plate 9 is fixedly installed above the arc-shaped plate 10.

[0036] In some examples, when the material comes into contact with the lower end of the positioning plate 82, it is blocked by the arc spring 85. At this time, the conveyor belt 23 continues to run, and the material is slowly straightened under the action of the conveyor belt 23, thus positioning the material. After the material is straightened, when the strip plate 24 moves to the rear of the material, it pushes the material forward and pushes the material to the bottom of the housing 3, thereby performing the roller coating operation on the material, improving the roller coating effect and making it easier to use.

[0037] The positioning plate 82 blocks the material, and the position of the material changes under the action of the conveyor belt 23, thus achieving the positioning effect of the material. Compared with the traditional high-precision double-roller coating machine, this high-precision double-roller coating machine straightens the position of the material through the cooperation of the positioning plate 82 and the conveyor belt 23, thereby improving the coating effect of the material and making it easier to use.

[0038] like Figures 1 to 7 As shown, it illustrates a high-precision double-roller coating machine with high coating accuracy in another embodiment of the present disclosure. A housing 3 is fixedly installed above the side plate 21. A roller assembly 4 is rotatably installed inside the housing 3. A motor assembly 5 is fixedly installed on the outside of the housing 3. The output end of the motor assembly 5 is fixedly connected to the front end of the roller assembly 4.

[0039] In some examples, the motor group 5 drives the roller group 4, which includes a pick-up roller, a coating roller, etc. The pick-up roller picks up paint from the paint tray and transfers the paint to the coating roller. The coating roller is responsible for evenly applying the paint to the surface of the object.

[0040] like Figures 1 to 7 As shown, a high-precision double-roller coating machine with high coating accuracy is shown in another embodiment of the present disclosure. A servo motor 25 is fixedly installed on the outer side of the side plate 21, and the output end of the servo motor 25 is fixedly connected to the front end of the roller 22.

[0041] In some examples, the servo motor 25 is started, which drives the roller 22 to rotate, and the roller 22 drives the conveyor belt 23 to run.

[0042] like Figures 1 to 7 As shown, it illustrates a high-precision double-roller coating machine with high coating accuracy in another embodiment of the present disclosure. A control board 7 is fixedly installed on the outside of the base 1. The control board 7 is electrically connected to the air pump 63, and the pressure sensor 13 is electrically connected to the control board 7.

[0043] In some examples, pressure sensor 13 sends an electrical signal to the inside of control board 7, which in turn drives air pump 63 to operate.

[0044] like Figures 1 to 7 As shown, it illustrates a high-precision double-roller coating machine with high coating accuracy in another embodiment of the present disclosure. An arc-shaped groove 83 is provided on the outer side of the round shaft 81, and an arc-shaped plate 84 located inside the arc-shaped groove 83 is fixedly installed on the inner side of the positioning plate 82.

[0045] In some examples, the positioning plate 82 rotates around the circular axis 81, causing the arc plate 84 to move inside the arc groove 83, thereby limiting the positioning plate 82.

[0046] like Figures 1 to 7 As shown, it illustrates a high-precision double-roller coating machine with high coating accuracy in another embodiment of the present disclosure. Limiting grooves 87 are provided on both sides of the arc-shaped groove 86, and arc-shaped limiting plates 11 located inside the limiting grooves 87 are fixedly installed on both sides of the arc-shaped plate 10.

[0047] In some examples, the movement of the arc-shaped plate 10 causes the arc-shaped limiting plate 11 to move inside the limiting groove 87, thereby limiting the arc-shaped plate 10.

[0048] like Figures 1 to 7As shown, it illustrates a high-precision double-roller coating machine with high coating accuracy in another embodiment of this disclosure. An arc spring 88 is elastically installed between the inner side of the arc groove 86 and the inner side of the arc plate 10, and the arc of the arc spring 88 corresponds to the arc groove 86.

[0049] In some examples, the arc plate 10 moves inside the arc groove 86 to compress the arc spring 88, causing the arc spring 88 to deform, thereby pushing the push plate 9 to compress the pressure sensor 13.

[0050] like Figures 1 to 7 As shown, it illustrates a high-precision two-roller coating machine with high coating accuracy in another embodiment of the present disclosure, wherein the pusher plate 9 corresponds to the pressure sensor 13, and the pressure sensor 13 corresponds to the air pump 63.

[0051] In some examples, the push plate 9 squeezes the pressure sensor 13, causing the pressure sensor 13 to drive the air pump 63 through the control plate 7.

[0052] like Figures 1 to 7 As shown, it illustrates a high-precision two-roller coating machine with high coating accuracy in another embodiment of this disclosure. An arc spring 85 is elastically installed on the inner side of the arc groove 83, and the arc spring 85 is located on the inner side of the arc plate 84.

[0053] In some examples, the arc plate 84 moves inside the arc groove 83 to compress the arc spring 85, causing the arc spring 85 to deform, thereby driving the positioning plate 82 back to its original position.

[0054] Working principle and usage process of this utility model:

[0055] In use, first start the servo motor 25 and motor group 5 to start the roller 22 and roller group 4. Then, place the material above the conveyor belt 23. The conveyor belt 23 moves the material. When the material moves to the bottom of the U-shaped frame 61, the material contacts the lower end of the positioning plate 82. Under the action of the arc spring 85, the material is blocked. When the strip plate 24 moves to the rear of the material, it pushes the material forward, causing the positioning plate 82 to rotate around the circular shaft 81. This causes the push plate 9 to squeeze the pressure sensor 13. The pressure sensor 13 compresses the pressure sensor through the piezoresistive effect. The pressure should be converted into an electrical signal. After the control board 7 analyzes the signal, it drives the air pump to run through the relay module, so that the air pump 63 blows air onto the surface of the material through the air outlet 67. After the material passes through, the arc spring 85 releases its elastic potential energy to push the positioning plate 82 back to its original position, so that the push plate 9 is disengaged from the pressure sensor 13, thereby turning off the air pump 63. At this time, the material moves to the bottom of the roller group 4, and the motor group 5 drives the picking roller and the coating roller to run. The picking roller picks up the paint from the paint tray and transfers the paint to the coating roller. The coating roller is responsible for evenly coating the paint onto the surface of the object.

[0056] When the material comes into contact with the lower end of the positioning plate 82, it is blocked by the arc spring 85. At this time, the conveyor belt 23 continues to run, and the material is slowly straightened under the action of the conveyor belt 23, thus positioning the material. After the material is straightened, when the strip plate 24 moves to the rear of the material, it pushes the material forward and pushes the material to the bottom of the shell 3, thus performing the roller coating operation on the material, improving the roller coating effect and making it easier to use.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications or substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A high-precision double-roller coating machine, comprising a base (1), characterized in that: A material conveying mechanism (2) is provided above the base (1), and an air blowing mechanism (6) is provided above the material conveying mechanism (2). The air blowing mechanism (6) includes a U-shaped frame (61) fixedly installed above the material conveying mechanism (2). A connecting block (62) is fixedly installed on the front side of the U-shaped frame (61). An air pump (63) is fixedly installed above the connecting block (62). An air inlet pipe (64) is fixedly installed on the rear left side of the air pump (63). An air outlet pipe (65) is fixedly installed on the outer side of the U-shaped frame (61). An air outlet pipe (66) extending into the air outlet pipe (65) is fixedly installed on the rear right side of the air pump (63). An air outlet (67) is opened at the bottom of the air outlet pipe (65). A groove (68) is opened on the inner side of the U-shaped frame (61). An installation block (12) is fixedly installed inside the groove (68). A pressure sensor (13) is fixedly installed on the outer side of the installation block (12).

2. The high-precision twin-roller coating machine according to claim 1, characterized in that: The material conveying mechanism (2) includes a side plate (21) fixedly installed above the base (1). Two rollers (22) are rotatably installed between the inner sides of the side plate (21). The two rollers (22) are connected by a conveyor belt (23). Strip plates (24) are evenly fixedly installed on the outer side of the conveyor belt (23). A positioning mechanism (8) is provided inside the groove (68). The positioning mechanism (8) includes a round shaft (81) fixedly connected inside the groove (68). A positioning plate (82) is movably sleeved on the outer side of the round shaft (81). An arc groove (86) is opened above the positioning plate (82). An arc plate (10) is movably installed inside the arc groove (86). A push plate (9) is fixedly installed above the arc plate (10).

3. The high-precision twin-roller coating machine according to claim 2, characterized in that: A housing (3) is fixedly installed above the side plate (21). A roller assembly (4) is rotatably installed inside the housing (3). A motor assembly (5) is fixedly installed on the outside of the housing (3). The output end of the motor assembly (5) is fixedly connected to the front end of the roller assembly (4).

4. The high-precision twin-roller coating machine according to claim 2, characterized in that: A servo motor (25) is fixedly installed on the outer side of the side plate (21), and the output end of the servo motor (25) is fixedly connected to the front end of the roller (22).

5. The high-precision twin-roller coating machine according to claim 1, characterized in that: A control board (7) is fixedly installed on the outside of the base (1). The control board (7) is electrically connected to the air pump (63), and the pressure sensor (13) is electrically connected to the control board (7).

6. A high-precision twin-roller coating machine with high coating accuracy according to claim 2, characterized in that: An arc-shaped groove (83) is provided on the outer side of the circular shaft (81), and an arc-shaped plate (84) located inside the arc-shaped groove (83) is fixedly installed on the inner side of the positioning plate (82).

7. A high-precision twin-roller coating machine according to claim 2, characterized in that: Limiting grooves (87) are provided on both sides of the arc-shaped groove two (86), and arc-shaped limiting plates (11) located inside the limiting grooves (87) are fixedly installed on both sides of the arc-shaped plate two (10).

8. A high-precision twin-roller coating machine with high coating accuracy according to claim 2, characterized in that: An arc spring (88) is elastically installed between the inner side of the arc groove (86) and the inner side of the arc plate (10), and the arc of the arc spring (88) corresponds to the arc groove (86).

9. A high-precision twin-roller coating machine according to claim 2, characterized in that: The push plate (9) corresponds to the pressure sensor (13), and the pressure sensor (13) corresponds to the air pump (63).

10. A high-precision twin-roller coating machine according to claim 6, characterized in that: An arc spring (85) is elastically installed on the inner side of the arc groove (83), and the arc spring (85) is located on the inner side of the arc plate (84).

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