Polyvinyl chloride physical coating device

Abstract

The utility model belongs to the technical field of coating processing, and discloses a polyvinyl chloride physical coating device which comprises a working table, a plurality of groups of supports are arranged on the working table, a moving device is fixedly mounted on the plurality of groups of supports, and a material storage barrel and an air compressor are arranged on the moving device. An atomizing and spraying device is arranged below the moving device, the moving device comprises a shell, a transverse moving device and a longitudinal moving device, the atomizing and spraying device is fixedly installed at the bottom of the longitudinal moving device through a connecting rod and comprises an atomizing cavity, a liquid collecting bottom pipe and a spray head, and the moving device can drive the atomizing and spraying device to move in a plane. The spraying device is compact and reasonable in structural design, paint can be atomized through high-pressure gas, and the polyvinyl chloride paint is sprayed to the surface of an object to be machined through the spraying head. And the spraying head can move in a plane, the movement coverage range is wide, the device is easy to maintain, spraying is almost free of dead angles, and the spraying quality is good.

Description

Technical Field

[0001] This utility model relates to the field of coating processing technology, specifically a physical coating device for polyvinyl chloride. Background Technology

[0002] Polyvinyl chloride (PVC), as an important synthetic polymer material, possesses excellent chemical resistance, abrasion resistance, electrical insulation, and weather resistance, and is widely used in construction, chemical, electronics, and medical fields. Its liquid coatings, through physical coating processes, can form a uniform and dense protective layer, effectively improving the substrate's corrosion resistance and service life.

[0003] Currently, the industrial coating field mainly uses the following three types of spraying devices: Handheld sprayers: These rely on manual operation, resulting in high labor intensity and poor spray uniformity. Manual control of the sprayer's movement speed and angle can easily lead to uneven coating thickness due to operator fatigue, and it's difficult to achieve full coverage of complex curved surfaces or hidden areas, resulting in obvious spraying dead zones. Mechanical swing-type devices: These achieve spraying through a preset robotic arm swing path. While they can partially replace manual labor, the movement trajectory is fixed, and the coverage area is limited. For large workpieces or irregularly shaped structures, frequent adjustments to the equipment's posture are required, leading to low production efficiency. Track-based devices: These constrain the sprayer's movement through a fixed track. While they can achieve straight-line or simple curve spraying, the equipment is complex to install and lacks flexibility. The track layout must strictly match the workpiece size, making it difficult to adapt to the flexible production needs of multi-specification products. All three of these traditional coating devices have certain dead zones, making it easy for some areas to be incompletely coated during spraying, resulting in poor coating quality.

[0004] Existing spraying equipment still has a significant problem. Due to uneven molecular weight distribution or formulation instability, some PVC resins form gel particles in the liquid system. When plasticizers, stabilizers, and other additives are not compatible with the resin, they are prone to precipitate and form flocculent suspensions. Heavy fillers (such as calcium carbonate and titanium dioxide) will settle and form hard lumps after long-term standing. These turbid solid substances have large particle sizes and even have a certain degree of adhesion, which can easily cause nozzle clogging during the spraying process. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a polyvinyl chloride physical coating device, which solves the problems mentioned in the background art, such as large spraying dead angles and easy clogging of the spray nozzle.

[0007] (II) Technical Solution

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a polyvinyl chloride physical coating device, including a workbench, multiple sets of supports are provided on the workbench, a moving device is fixedly installed on the multiple sets of supports, a material storage tank and an air compressor are provided on the moving device, and an atomizing spraying device is provided below the moving device.

[0009] Preferably, the moving device includes a housing, a lateral moving device, and a longitudinal moving device. The housing is welded onto multiple sets of brackets. The lateral moving device and the longitudinal moving device are installed inside the housing. A connecting rod is installed below the longitudinal moving device. The atomizing spraying device is fixedly installed at the bottom of the longitudinal moving device through the connecting rod.

[0010] Preferably, the lateral movement device includes two sets of lateral movement tracks, lateral movement sliders, and lateral lead screws. The lateral movement sliders are slidably engaged within the two sets of lateral movement tracks. A lateral lead screw is provided on one side of one set of lateral movement sliders away from the center, and the movable part of the lateral lead screw is welded to the lateral movement slider. A servo motor is provided on one side of the lateral lead screw.

[0011] Preferably, the longitudinal moving device includes a longitudinal motion track, a longitudinal motion slider, and a longitudinal lead screw. The longitudinal motion track and the longitudinal lead screw are fixedly installed at the center of two sets of transverse motion sliders. The longitudinal motion slider is slidably engaged in the longitudinal motion track. The longitudinal motion slider is welded to the movable part of the longitudinal lead screw. The side of the longitudinal motion slider away from the longitudinal lead screw is welded to the connecting rod. A servo motor is provided on one side of the longitudinal lead screw.

[0012] Preferably, the atomizing spraying device includes an atomizing chamber, a liquid collecting bottom pipe, and a nozzle. An mounting ring is provided on the atomizing chamber, and the atomizing spraying device is fixedly installed at the bottom of the connecting rod via the mounting ring. A material conveying pipe is provided on one side of the atomizing chamber, and a nozzle is provided on the side of the atomizing chamber opposite to the material conveying pipe. A liquid collecting bottom pipe is provided below the atomizing chamber, and a high-pressure gas pipe is provided on one side of the liquid collecting bottom pipe. A cleaning valve is provided at the end of the liquid collecting bottom pipe. The high-pressure gas pipe is sealed to the output end of an air compressor. A liquid pump is provided inside the material storage tank, and the material conveying pipe is sealed to the output end of the liquid pump.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, the present invention provides a polyvinyl chloride physical coating device, which has the following beneficial effects:

[0015] 1. This PVC physical coating device is equipped with a moving device, an atomizing spraying device, and an air compressor. It can atomize the coating using high-pressure gas and spray the PVC coating onto the surface of the object to be processed through a nozzle. The nozzle can move within a plane, covering a wide area. The device is easy to maintain, has virtually no blind spots in the coating process, and produces high-quality coating.

[0016] 2. Equipped with a moving device, the spraying device can be moved horizontally via the horizontal and vertical moving devices, covering a wide area with almost no blind spots and producing good spraying quality.

[0017] 3. Equipped with a liquid collection bottom pipe, which is located below the atomization chamber, it can collect turbidity in the coating material at the bottom, preventing turbidity and suspended matter that are not easy to atomize from clogging the nozzle, resulting in good spraying quality. Furthermore, the turbidity and other substances accumulated at the liquid collection bottom pipe can be removed through the cleaning valve, making maintenance convenient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the mobile device of this utility model;

[0020] Figure 3 This is a schematic diagram of the horizontal and vertical moving device of this utility model;

[0021] Figure 4 This is a schematic diagram of the atomizing spraying device of this utility model.

[0022] In the diagram: 1. Workbench; 2. Support; 3. Moving device; 4. Material storage bin; 5. Air compressor; 6. Atomizing spraying device; 7. Lateral moving device; 8. Longitudinal moving device; 9. Lateral motion track; 10. Lateral motion slider; 11. Lateral lead screw; 12. Longitudinal motion track; 13. Longitudinal motion slider; 14. Longitudinal lead screw; 15. Atomizing chamber; 16. High-pressure gas pipeline; 17. Material conveying pipeline; 18. Liquid collection bottom pipe; 19. Spray head; 20. Cleaning valve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 This utility model provides a technical solution:

[0025] A physical coating apparatus for polyvinyl chloride (PVC) includes a worktable 1, on which multiple sets of supports 2 are mounted. A moving device 3 is fixedly installed on each set of supports 2. A material storage tank 4 and an air compressor 5 are mounted on the moving device 3. An atomizing spraying device 6 is located below the moving device 3. The material storage tank 4 stores material and continuously supplies PVC coating using a liquid pump. The air compressor 5 provides high-pressure air, which atomizes the coating, causing the atomized coating to be sprayed out along with the air. It is recommended that a flow valve be installed at the output end of the liquid pump in the material storage tank 4. It is recommended that the air compressor 5 be a power-adjustable device; if the power is not adjustable, a flow valve must be installed to control the high-pressure gas delivery volume.

[0026] Furthermore, the moving device 3 includes a housing, a lateral moving device 7, and a longitudinal moving device 8. The housing is welded onto multiple sets of brackets 2. The lateral moving device 7 and the longitudinal moving device 8 are installed inside the housing. A connecting rod is installed below the longitudinal moving device 8. The atomizing spraying device 6 is fixedly installed at the bottom of the longitudinal moving device 8 via the connecting rod.

[0027] Furthermore, the lateral movement device 7 includes two sets of lateral movement tracks 9, lateral movement sliders 10, and a lateral lead screw 11. The lateral movement sliders 10 are slidably engaged within the two sets of lateral movement tracks 9. A lateral lead screw 11 is located on the side of one set of lateral movement sliders 10 opposite to the center, and the movable part of the lateral lead screw 11 is welded to the lateral movement slider 10. A servo motor is located on one side of the lateral lead screw 11. The servo motor drives the lateral lead screw 11 to rotate. Since the movable part of the lateral lead screw 11 is welded to the lateral movement slider 10, the rotation of the lateral lead screw 11 causes the lateral movement slider 10 to slide within the lateral movement tracks 9. By controlling the forward and reverse rotation and the speed of the servo motor, the moving direction and speed of the lateral movement slider 10 can be precisely controlled, thereby achieving the position adjustment of the atomizing spraying device 6 in the lateral direction.

[0028] Furthermore, the longitudinal moving device 8 includes a longitudinal motion track 12, a longitudinal motion slider 13, and a longitudinal lead screw 14. The longitudinal motion track 12 and the longitudinal lead screw 14 are fixedly mounted at the center of two sets of transverse motion sliders 10. The longitudinal motion slider 13 is slidably engaged within the longitudinal motion track 12. The longitudinal motion slider 13 is welded to the movable part of the longitudinal lead screw 14. The side of the longitudinal motion slider 13 facing away from the longitudinal lead screw 14 is welded to a connecting rod. A servo motor is installed on one side of the longitudinal lead screw 14. The structure of the longitudinal moving device 8 is similar to that of the transverse moving device 7, including a longitudinal motion track 12, a longitudinal motion slider 13, and a longitudinal lead screw 14. The longitudinal motion track 12 and the longitudinal lead screw 14 are fixedly mounted at the center of two sets of transverse motion sliders 10, and the longitudinal lead screw 14 is also driven by a servo motor. The longitudinal motion slider 13 slides within the longitudinal motion track 12 and is welded to the movable part of the longitudinal lead screw 14. The rotation of the longitudinal lead screw 14 is controlled by the servo motor, thereby driving the longitudinal motion slider 13 to move, realizing the position adjustment of the atomizing spraying device 6 in the longitudinal direction.

[0029] Furthermore, the atomizing spraying device 6 includes an atomizing chamber 15, a liquid collecting bottom pipe 18, and a nozzle 19. An mounting ring is provided on the atomizing chamber 15, and the atomizing spraying device 6 is fixedly installed at the bottom of the connecting rod via the mounting ring. A material conveying pipe 17 is provided on one side of the atomizing chamber 15, and the nozzle 19 is provided on the side of the atomizing chamber 15 opposite to the material conveying pipe 17. The liquid collecting bottom pipe 18 is located below the atomizing chamber 15, and a high-pressure gas pipe 16 is provided on one side of the liquid collecting bottom pipe 18. A cleaning valve 20 is provided at the end of the liquid collecting bottom pipe 18. The high-pressure gas pipe 16 is sealed to the output end of the air compressor 5. A liquid pump is provided inside the material storage tank 4, and the material conveying pipe 17 is sealed to the output end of the liquid pump. The liquid collecting bottom pipe 18 can collect these substances at the bottom, preventing them from clogging the nozzle 19, thereby ensuring the smooth progress of the spraying process and improving the spraying quality. When a certain amount of turbid substances or other materials accumulate in the bottom collection pipe 18, these substances can be removed by opening the cleaning valve 20 at the end of the bottom collection pipe 18. This design simplifies and facilitates the maintenance of the device, extends its service life, and reduces operating costs.

[0030] Structural Description:

[0031] Workbench 1: It supports the object to be processed and provides a stable operating plane for coating operations. It is a horizontal plate structure and is the basic support component of the entire device. Multiple sets of brackets 2 are fixedly installed on its surface.

[0032] Support 2: Supports the moving device 3, ensuring its stable installation and providing space for its movement. It consists of multiple sets of upright rod-like structures, with the bottom fixedly connected to the workbench 1 and the top welded to the outer shell of the moving device 3.

[0033] Mobile device 3: Drives the atomizing spraying device 6 to move in the plane to achieve large-area, no dead angle spraying. It includes a shell, a horizontal moving device 7 and a vertical moving device 8. The shell is supported by multiple sets of brackets 2. The horizontal moving device 7 and the vertical moving device 8 are integrated inside. It is connected to the atomizing spraying device 6 below through a connecting rod.

[0034] Material storage tank 4: Stores polyvinyl chloride coating and provides a stable supply of coating to the atomizing spraying device 6 through an internal liquid pump. The tank-shaped container is installed on the mobile device 3 and is sealed to the atomizing chamber 15 of the atomizing spraying device 6 through the material conveying pipe 17.

[0035] Air compressor 5: generates high-pressure gas to atomize the paint and assist in spraying;

[0036] Atomizing spraying device 6: Atomizes and sprays paint onto the surface of the object to be processed, including atomizing chamber 15, liquid collection bottom pipe 18 and nozzle 19, and is fixed to the connecting rod at the bottom of longitudinal moving device 8 by mounting ring;

[0037] Lateral movement device 7: controls the atomizing spraying device 6 to move in the lateral direction and adjust the spraying position. It consists of two sets of lateral movement tracks 9, lateral movement sliders 10 and lateral lead screws 11, and is installed inside the housing of the moving device 3. The lateral movement sliders 10 slide in the lateral movement tracks 9 and are welded to the moving parts of the lateral lead screws 11. It is driven by a servo motor.

[0038] Longitudinal moving device 8: controls the atomizing spraying device 6 to move in the longitudinal direction, and cooperates with the lateral movement to achieve all-round spraying in the plane. It includes a longitudinal motion track 12, a longitudinal motion slider 13 and a longitudinal lead screw 14. It is installed at the center of the lateral motion slider 10 of the lateral moving device 7. The longitudinal motion slider 13 slides in the longitudinal motion track 12 and is welded to the moving part of the longitudinal lead screw 14. It is driven by a servo motor.

[0039] Lateral motion track 9: provides motion guidance for the lateral motion slider 10 and ensures its stable sliding. It is a long strip-shaped track structure and is fixedly installed inside the housing of the mobile device 3. The lateral motion slider 10 slides and engages inside it.

[0040] Lateral motion slider 10: It carries the longitudinal moving device 8 and moves on the lateral motion track 9 to realize the lateral displacement of the atomizing spraying device 6. It has a block structure and is welded to the lateral lead screw 11. It slides in the lateral motion track 9 and the longitudinal motion track 12 and longitudinal lead screw 14 of the longitudinal moving device 8 are fixed in the center.

[0041] Horizontal lead screw 11: converts the rotation of the servo motor into the linear motion of the horizontal motion slider 10, precisely controlling the horizontal displacement. It is a screw-shaped component with a fixed frame and moving parts welded to the horizontal motion slider 10. A servo motor is installed on one side.

[0042] Longitudinal motion track 12: provides motion guidance for longitudinal motion slider 13 and ensures the stability of longitudinal movement. It is a long strip-shaped track structure, fixedly installed in the center of transverse motion slider 10, and the longitudinal motion slider 13 slides and engages inside it.

[0043] Longitudinal motion slider 13: It carries the atomizing spraying device 6 and moves on the longitudinal motion track 12 to realize the longitudinal displacement of the atomizing spraying device 6. It has a block structure and is welded to the moving part of the longitudinal lead screw 14. It is welded to the connecting rod on the side away from the longitudinal lead screw 14 and slides in the longitudinal motion track 12.

[0044] Longitudinal lead screw 14: converts the rotation of the servo motor into the linear motion of the longitudinal motion slider 13, precisely controlling the longitudinal displacement. It is a screw-shaped component with a fixed frame. The moving parts are welded to the longitudinal motion slider 13, and the servo motor is installed on one side.

[0045] Atomizing chamber 15: Serves as the place for atomizing the paint, so that the paint is turned into fine particles under the action of high pressure gas. The chamber structure is connected to the material conveying pipe 17 on one side and the nozzle 19 is set on the other side. The bottom of the chamber is connected to the liquid collection bottom pipe 18 and fixed to the bottom of the connecting rod by the mounting ring.

[0046] High-pressure gas pipeline 16: connects air compressor 5 and liquid collection bottom pipe 18, transports high-pressure gas, has a tubular structure, one end is sealed to the output end of air compressor 5, and the other end is sealed to one side of liquid collection bottom pipe 18.

[0047] Material conveying pipe 17: connects material storage tank 4 and atomizing chamber 15, conveys polyvinyl chloride coating, has a tubular structure, one end is sealed to the output end of the liquid pump in material storage tank 4, and the other end is sealed to one side of atomizing chamber 15.

[0048] Liquid collecting bottom pipe 18: Collects turbidity and suspended matter in the paint to prevent clogging of the nozzle 19, and at the same time delivers high-pressure gas to assist atomization. It has a tubular structure and is located below the atomization chamber 15. One side is connected to the high-pressure gas pipeline 16, and the end is equipped with a cleaning valve 20, which is connected to the atomization chamber 15.

[0049] Nozzle 19: Sprays out the atomized paint and evenly coats the surface of the object to be processed. It is located on the side of the atomization chamber 15 away from the material conveying pipe 17 and is connected to the atomization chamber 15. The paint is sprayed out through it.

[0050] Cleaning valve 20: Used to discharge turbid substances and other materials accumulated in the liquid collection bottom pipe 18, facilitating device maintenance. The valve is installed at the end of the liquid collection bottom pipe 18 to control the discharge of substances in the liquid collection bottom pipe 18.

[0051] Working Principle: This PVC physical coating device aims to atomize PVC coating using high-pressure gas and spray it evenly onto the surface of the object to be processed. Its operation mainly involves coating delivery, atomization, spraying, and precise control of the spraying position to ensure high-quality coating results. The material storage tank 4 is the coating storage container, equipped with a liquid pump. When the device starts, the liquid pump operates, generating sufficient pressure to extract the PVC coating from the material storage tank 4. The coating is then transported to the atomization chamber 15 of the atomizing spraying device 6 via a material delivery pipe 17 sealed to the output of the liquid pump. This design ensures a stable and continuous supply of coating to the spraying stage, providing the material basis for subsequent atomization and spraying. The moving device 3 plays a crucial role in the entire coating process, precisely controlling the position of the atomizing spraying device 6 to achieve large-area, dead-angle-free spraying. The moving device 3 includes a housing, a lateral moving device 7, and a longitudinal moving device 8. The lateral moving device 7 consists of two sets of lateral movement tracks 9, a lateral movement slider 10, and a lateral lead screw 11. A servo motor drives the horizontal lead screw 11 to rotate. Since the movable part of the horizontal lead screw 11 is welded to the horizontal motion slider 10, the rotation of the horizontal lead screw 11 causes the horizontal motion slider 10 to slide within the horizontal motion track 9. By controlling the forward and reverse rotation and speed of the servo motor, the moving direction and speed of the horizontal motion slider 10 can be precisely controlled, thereby realizing the position adjustment of the atomizing spraying device 6 in the horizontal direction. The structure of the longitudinal moving device 8 is similar to that of the horizontal moving device 7, including a longitudinal motion track 12, a longitudinal motion slider 13, and a longitudinal lead screw 14. The longitudinal motion track 12 and the longitudinal lead screw 14 are fixedly installed at the center of the two sets of horizontal motion sliders 10. The longitudinal lead screw 14 is also driven by a servo motor. The longitudinal motion slider 13 slides within the longitudinal motion track 12 and is welded to the movable part of the longitudinal lead screw 14. The rotation of the longitudinal lead screw 14 is controlled by the servo motor, thereby driving the longitudinal motion slider 13 to move, realizing the position adjustment of the atomizing spraying device 6 in the vertical direction. Through the coordinated operation of the lateral moving device 7 and the longitudinal moving device 8, the atomizing spraying device 6 can move to any position in the horizontal plane, covering a wide range with almost no blind spots, and can meet the coating needs of objects of different sizes and shapes. After the paint is delivered to the atomizing chamber 15, the air compressor 5 starts working. The air compressor 5 compresses the air into high-pressure gas, which is then delivered to the liquid collection bottom pipe 18 through the high-pressure gas pipe 16, which is sealed to the output end of the air compressor 5. The liquid collection bottom pipe 18 is located below the atomizing chamber 15. After the high-pressure gas enters the liquid collection bottom pipe 18, it will act on the paint in the atomizing chamber 15. Under the action of the high-pressure gas, the paint is atomized into fine particles. These atomized paint particles are sprayed out through the nozzle 19 and evenly sprayed onto the surface of the object to be processed on the worktable 1.The position of the nozzle 19 is precisely controlled by the moving device 3, ensuring that the coating accurately covers all parts of the object to be processed. The liquid collection bottom pipe 18, in addition to conveying high-pressure gas, also has important filtration and maintenance functions. The coating may contain some turbidity and suspended matter that is difficult to atomize. The liquid collection bottom pipe 18 can collect these substances at the bottom, preventing them from clogging the nozzle 19, thus ensuring the smooth progress of the spraying process and improving the spraying quality. When a certain amount of turbidity or other substances accumulates in the liquid collection bottom pipe 18, these substances can be removed by opening the cleaning valve 20 at the end of the liquid collection bottom pipe 18. This design makes the maintenance of the device simple and convenient, extends the service life of the device, and reduces operating costs. In summary, this PVC physical coating device, through the coordinated work of its various parts, realizes the functions of coating delivery, atomization, spraying, and position control. It has advantages such as good spraying quality, wide coverage, and easy maintenance, and can meet the needs of industrial production for PVC coating of object surfaces.

[0052] 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.

Claims

1. A polyvinyl chloride physical coating apparatus, comprising a worktable (1) and a support (2) disposed on the worktable (1), characterized in that: A moving device (3) is fixedly installed on the bracket (2). A material storage tank (4) and an air compressor (5) are provided on the moving device (3). An atomizing spraying device (6) is provided below the moving device (3).

2. The polyvinyl chloride physical coating apparatus according to claim 1, characterized in that: The moving device (3) includes a shell, a lateral moving device (7) and a longitudinal moving device (8). The shell is welded onto multiple sets of brackets (2). The lateral moving device (7) and the longitudinal moving device (8) are installed inside the shell. A connecting rod is installed below the longitudinal moving device (8). The atomizing spraying device (6) is fixedly installed at the bottom of the longitudinal moving device (8) through the connecting rod.

3. The polyvinyl chloride physical coating apparatus according to claim 2, characterized in that: The lateral movement device (7) includes two sets of lateral movement rails (9), lateral movement sliders (10), and lateral lead screws (11). The lateral movement sliders (10) are slidably engaged in the two sets of lateral movement rails (9). A lateral lead screw (11) is provided on the side of one set of lateral movement sliders (10) away from the center. The movable part of the lateral lead screw (11) is welded to the lateral movement slider (10). A servo motor is provided on one side of the lateral lead screw (11).

4. The polyvinyl chloride physical coating apparatus according to claim 3, characterized in that: The longitudinal moving device (8) includes a longitudinal motion track (12), a longitudinal motion slider (13), and a longitudinal lead screw (14). The longitudinal motion track (12) and the longitudinal lead screw (14) are fixedly installed in the center of two sets of transverse motion sliders (10). The longitudinal motion slider (13) is slidably engaged in the longitudinal motion track (12). The longitudinal motion slider (13) is welded to the movable part of the longitudinal lead screw (14). The side of the longitudinal motion slider (13) away from the longitudinal lead screw (14) is welded to the connecting rod. A servo motor is provided on one side of the longitudinal lead screw (14).

5. A polyvinyl chloride physical coating apparatus according to claim 4, characterized in that: The atomizing spraying device (6) includes an atomizing chamber (15), a liquid collecting bottom pipe (18), and a nozzle (19). An installation ring is provided on the atomizing chamber (15), and the atomizing spraying device (6) is fixedly installed at the bottom of the connecting rod by the installation ring. A material conveying pipe (17) is provided on one side of the atomizing chamber (15), and a nozzle (19) is provided on the side of the atomizing chamber (15) away from the material conveying pipe (17). A liquid collecting bottom pipe (18) is provided below the atomizing chamber (15), and a high-pressure gas pipe (16) is provided on one side of the liquid collecting bottom pipe (18). A cleaning valve (20) is provided at the end of the liquid collecting bottom pipe (18). The high-pressure gas pipe (16) is sealed to the output end of the air compressor (5). A liquid pump is provided in the material storage tank (4), and the material conveying pipe (17) is sealed to the output end of the liquid pump.

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