Wood surface vacuum metal coating equipment

Abstract

The invention relates to the technical field of vacuum metal coating, and discloses wood surface vacuum metal coating equipment which comprises a vacuum box, a center column is fixedly mounted in the vacuum box, an evaporation crucible is embedded in the upper side surface of the center column, a material distribution barrel is rotatably mounted in the center column, and a flow guide groove is formed in the center column; the material distribution cylinder is communicated with an inner cavity of the evaporation crucible through the flow guide groove, a rotating frame is rotationally installed on the surface of the center column, a plurality of inserting cavities are formed in the front side of the rotating frame, a servo motor is fixedly installed in the vacuum box, and the servo motor drives the rotating frame and the material distribution cylinder to rotate at the differential speed. According to the equipment, the servo motor drives the rotating frame to rotate, a to-be-plated material is placed on the rotating frame, the to-be-plated material is thermally evaporated in the evaporation crucible, a plated film is formed on the surface of the to-be-plated material, in the process, the to-be-plated material does circular motion, the distance difference between each point on the surface of the to-be-plated material and an evaporation source is reduced, and the thickness of the plated film is more uniform.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum metal coating, and particularly relates to a vacuum metal coating device for the surface of wood. Background Art

[0002] When the surface of wood is subjected to metal coating treatment, the wood has antistatic and electromagnetic shielding functions, and at the same time, it has functions of hardening, color adjustment, wear resistance, insect resistance, decoration, and optics. In this way, the wood has some characteristics of metal on the basis of its original properties. For example, in the prior art, the patent document with the publication number CN100529159C proposed a manufacturing method for vacuum coating on the surface of wood, which has functions of anti-electromagnetic radiation, static conduction, hardening, color adjustment, wear resistance, insect resistance, and decoration by plating a layer of metal film on the surface of wood.

[0003] In the prior art, the patent document with the publication number CN107541704B proposed a coating method for a metal cup. A turntable is provided in the operating environment. A metal cup body to be coated is correspondingly placed in the turntable. A metal target to be plated is correspondingly provided on one side of the turntable. An air duct fixture is provided between the target and the turntable. An air nozzle is provided on the air duct fixture to spray and guide inert gas onto the metal cup body. After the environment is heated to a certain value, arc discharge is started. The arc hits the target to make it ionized, and reacts with the inert gas led out by the corresponding angle of the target and the air duct fixture, so that the target metal compound is deposited on the surface of the cup body. Through the above steps, a uniform coating process is achieved.

[0004] The above method improves the coating uniformity by rotating. However, during the coating process of plate-shaped wood, the area of the material to be coated is relatively large. Generally, the evaporation source of the existing coating device is a point evaporation source. The thickness of the vacuum evaporation coating film gradually decreases as the distance from the center of the material to be coated to the evaporation source increases. That is, the greater the distance, the thinner the film thickness. The distances from each point on the surface of the material to be coated to the evaporation source are different, resulting in uneven coating thickness. Based on this, the existing vacuum metal coating equipment has the problem of uneven coating thickness when coating materials with a relatively large plane, and needs to be further improved. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcoming of uneven coating thickness of the existing vacuum metal coating equipment when coating materials with a relatively large plane, and to propose a vacuum metal coating device for the surface of wood.

[0006] To achieve the above object, the present invention adopts the following technical solution: A vacuum metal coating device for the surface of wood, comprising a vacuum chamber. A central column is fixedly installed inside the vacuum chamber. An evaporation crucible is embedded on the upper surface of the central column. A cloth cylinder is rotatably installed inside the central column. A diversion channel is opened inside the central column. The cloth cylinder is communicated with the inner cavity of the evaporation crucible through the diversion channel. A rotating frame is rotatably installed on the surface of the central column. A plurality of insertion cavities are opened on the front side of the rotating frame. An annular groove is opened on the inner wall of the rotating frame. The insertion cavities are communicated with the inner cavity of the evaporation crucible through the annular groove. A servo motor is fixedly installed inside the vacuum chamber. The servo motor drives the rotating frame and the cloth cylinder to rotate at different speeds.

[0007] The material to be coated is inserted into the insertion cavity. A cooling component for cooling the surface of the material to be coated is arranged on the surface of the central column. The material to be coated makes a circular motion as the rotating frame rotates, reducing the distance difference between each point on the surface of the material to be coated and the evaporation source, making the coating thickness more uniform, and solving the problem of uneven coating thickness existing in the existing vacuum metal coating equipment when coating materials with a relatively large plane.

[0008] Preferably, a plurality of first feeding ports are opened on the surface of the cloth cylinder. The plurality of first feeding ports are arranged in an annular array on the surface of the cloth cylinder. An adjusting cylinder that reciprocates linearly is slidably installed inside the central column. The adjusting cylinder is sleeved on the surface of the cloth cylinder movably. A plurality of second feeding ports are opened on the lower surface of the adjusting cylinder. A control component is arranged at the rear end of the central column. By adjusting the overlapping area between the second feeding port and the first feeding port through the control component, it has the function of controlling the feeding speed of the first feeding port of the cloth cylinder.

[0009] The control component includes a magnetic ring, a return spring and an electromagnetic coil. The magnetic ring is fixedly installed at the rear end of the adjusting cylinder. The two ends of the return spring respectively abut against the magnetic ring and the central column. The electromagnetic coil is fixedly connected to the rear end of the central column and is sleeved around the periphery of the rear end of the cloth cylinder.

[0010] Preferably, a threaded hole communicating with the cloth cylinder is opened at the front end of the central column. A feeding pipe is threadedly installed in the threaded hole. A storage groove is opened on the surface of the feeding pipe. The feeding pipe is slidably inserted into the cloth cylinder, and the storage groove is adjusted to face downward. The storage groove, the first feeding port, the second feeding port and the diversion channel form a feeding channel. The coating material in the feeding pipe enters the evaporation crucible through the feeding channel. The feeding pipe is convenient to disassemble and assemble, facilitating the loading of the coating material into its interior.

[0011] Preferably, a gear and a first synchronous pulley are respectively and fixedly installed on the rotating end of the servo motor, a toothed ring is fixedly installed at the rear end of the rotating frame, a second synchronous pulley is fixedly installed at the rear end of the cloth cylinder, the gear is in meshing transmission with the toothed ring, the first synchronous pulley and the second synchronous pulley are in transmission through a synchronous belt. When the servo motor drives the rotating frame and the cloth cylinder to rotate at a differential speed, by changing the speed of the differential rotation, the rhythm of the plating material entering the evaporation crucible in the feeding pipe is adjusted. By adjusting the rotation speed of the servo motor, the rotation speed of the material to be plated and the input rhythm of the plating material are jointly controlled, achieving the effect of dynamically controlling the coating thickness and meeting the production requirements of automatic control.

[0012] Preferably, the cooling assembly includes a hollow roller, a cooling input pipe and a cooling output pipe. The cooling input pipe and the cooling output pipe are fixedly installed at the rear end of the central column. An air cavity is formed inside the central column. A movable plug is slidably installed in the air cavity. A transmission rod is fixedly installed at the end of the movable plug. The hollow roller is rotatably connected to the end of the transmission rod away from the movable plug. Rotating joints are rotatably installed at both ends of the hollow roller. The rotating joints at both ends are respectively communicated with the cooling input pipe and the cooling output pipe through hoses. When the movable plug slides, the hollow roller can extend out of the central column to contact the surface of the material to be plated and roll along the surface of the material to be plated.

[0013] A cleaning pipe is fixedly installed at the rear end of the central column. An air duct hole is formed inside the central column. The cleaning pipe is communicated with the air cavity through the air duct hole. A tension spring is fixedly installed inside the air cavity. The end of the tension spring is fixedly connected to the end of the movable plug, realizing the automatic control of the telescopic movement of the hollow roller. The hollow roller has the function of pre-cooling the surface of the material to be plated, providing favorable conditions for the condensation of the plating material steam flow on the surface of the material to be plated and improving the coating quality.

[0014] Preferably, an operation window is arranged on the front surface of the vacuum chamber. A sealing door is hingedly installed on the front surface of the vacuum chamber. The sealing door covers the operation window. A locking knob is inserted into the sealing door. The locking knob is in threaded connection with the front surface of the vacuum chamber. An air extraction pipe and an injection pipe are respectively fixedly installed on the side surface of the vacuum chamber. The vacuum pump is connected to the air extraction pipe, and the inner cavity of the vacuum chamber can be evacuated.

[0015] The present invention has the following beneficial effects: 1. For the vacuum metal coating equipment proposed by the present invention, the rotating frame is driven to rotate by the servo motor. The material to be plated is placed on the rotating frame. The plating material is thermally evaporated in the evaporation crucible to form a coating on the surface of the material to be plated. During this process, the material to be plated makes a circular motion, reducing the distance difference between each point on the surface of the material to be plated and the evaporation source, making the coating thickness more uniform, and solving the problem of uneven coating thickness existing in the existing vacuum metal coating equipment when coating materials with a large plane.

[0016] 2. The rotating frame and the cloth cylinder are driven by a servo motor to rotate at different speeds. During the rotation of the rotating frame, the distances from each point on the surface of the material to be plated to the evaporation source are changing. During the rotation of the cloth cylinder, the rhythm of the plating material entering the evaporation crucible can be adjusted, so that the thermal evaporation amount of the plating material changes with the rotation angle of the material to be plated. That is, by adjusting the rotation speed of the servo motor, the rotation speed of the material to be plated and the input rhythm of the plating material are jointly controlled to achieve the effect of dynamically controlling the coating thickness and meet the production requirements of automatic control.

[0017] 3. By sleeving an adjusting cylinder outside the cloth cylinder, an electromagnetic coil generates a magnetic thrust to drive the adjusting cylinder to move reciprocally, thereby changing the overlapping area between the second material input port and the first material input port, enabling it to control the feeding speed of the first material input port of the cloth cylinder. When the rotation speed of the rotating frame is constant, it meets the usage requirements of different coating speeds for materials to be plated with different materials and improves the coating quality.

[0018] 4. By arranging hollow rollers around the central column and injecting water into the hollow rollers, the hollow rollers have the function of pre-cooling the surface of the material to be plated, facilitating the subsequent coating forming. The extension of the hollow rollers to contact the material to be plated and the retraction of the hollow rollers into the central column are automatically completed. That is, when the vacuum chamber is evacuated and the cleaning pipe injects clean air into the vacuum chamber to wash the vacuum cavity, due to the negative air pressure outside the central column and the positive air pressure in the air cavity, at this time, the hollow rollers extend and contact the material to be plated. When the vacuum chamber is evacuated, the air pressure in the air cavity decreases, and under the action of the tension spring, at this time, the hollow rollers retract into the central column. Because heat transfer requires an air medium, this design enables the material to be plated to maintain a more lasting pre-cooling temperature after the vacuum chamber is evacuated, providing favorable conditions for the condensation of the plating material vapor flow on the surface of the material to be plated and improving the coating quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the three-dimensional structure schematic diagram (one) of the device proposed by the present invention; Figure 2 is the three-dimensional structure schematic diagram (two) of the device proposed by the present invention; Figure 3 is the three-dimensional structure schematic diagram of the rotating frame proposed by the present invention; Figure 4 is the top cross-sectional structure schematic diagram of the device proposed by the present invention; Figure 5 is the front cross-sectional structure schematic diagram of the device proposed by the present invention; Figure 6 is Figure 5 the enlarged schematic diagram of the structure at A in Figure 7 is the schematic diagram of the rotation of the cloth cylinder proposed by the present invention; Figure 8Schematic diagram of the three-dimensional structure of the cloth cylinder, adjustment cylinder, and feeding pipe proposed by the present invention; Figure 9 Explosion diagram of the cloth cylinder, adjustment cylinder, and feeding pipe proposed by the present invention.

[0020] In the figure: 1 vacuum box, 2 central column, 3 evaporation crucible, 4 cloth cylinder, 5 diversion groove, 6 rotating frame, 7 insertion cavity, 8 servo motor, 9 first feeding port, 10 adjustment cylinder, 11 second feeding port, 12 magnetic ring, 13 return spring, 14 electromagnetic coil, 15 feeding pipe, 16 storage tank, 17 gear, 18 first synchronous pulley, 19 gear ring, 20 second synchronous pulley, 21 hollow roller, 22 cooling input pipe, 23 cooling output pipe, 24 air cavity, 25 movable plug, 26 cleaning pipe, 27 air duct hole, 28 tension spring, 29 sealing door, 30 exhaust pipe, 31 injection pipe. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0023] Referring to Figures 1-9 , a vacuum metal coating device for the surface of wood, including a vacuum box 1. An operation window is provided on the front surface of the vacuum box 1. A sealing door 29 is hingedly installed on the front surface of the vacuum box 1. The sealing door 29 covers the operation window. A locking knob is inserted into the sealing door 29, and the locking knob is threadedly connected to the front surface of the vacuum box 1. Closing the sealing door 29 forms a sealed cavity inside the vacuum box 1. An exhaust pipe 30 and an injection pipe 31 are respectively fixedly installed on the side surface of the vacuum box 1. The vacuum pump is connected to the exhaust pipe 30, and the inner cavity of the vacuum box 1 can be evacuated.

[0024] Inside the vacuum chamber 1, a central column 2 is fixedly installed. An evaporation crucible 3 is embedded in the upper surface of the central column 2. Inside the central column 2, a cloth cylinder 4 is rotatably installed. A diversion groove 5 is formed inside the central column 2. The cloth cylinder 4 communicates with the inner cavity of the evaporation crucible 3 through the diversion groove 5. A rotating frame 6 is rotatably installed on the surface of the central column 2. A plurality of insertion cavities 7 are formed on the front side of the rotating frame 6. The material to be plated is inserted into the insertion cavities 7. An annular groove is formed on the inner wall of the rotating frame 6. The insertion cavities 7 communicate with the inner cavity of the evaporation crucible 3 through the annular groove. A servo motor 8 is fixedly installed inside the vacuum chamber 1. The servo motor 8 drives the rotating frame 6 and the cloth cylinder 4 to rotate at different speeds.

[0025] Specifically, referring to Figure 3 , on the rotating ends of the servo motor 8, a gear 17 and a first synchronous pulley 18 are respectively fixedly installed. A toothed ring 19 is fixedly installed at the rear end of the rotating frame 6. A second synchronous pulley 20 is fixedly installed at the rear end of the cloth cylinder 4. The gear 17 meshes with the toothed ring 19 for transmission. The first synchronous pulley 18 and the second synchronous pulley 20 are driven by a synchronous belt. When the servo motor 8 drives the rotating frame 6 and the cloth cylinder 4 to rotate at different speeds, the rotation speed difference between the rotating frame 6 and the cloth cylinder 4 is determined by the transmission ratio of the first synchronous pulley 18 and the second synchronous pulley 20. This belongs to the prior art and will not be elaborated here.

[0026] Among them, a plurality of first feeding ports 9 are formed on the surface of the cloth cylinder 4. The plurality of first feeding ports 9 are arranged in an annular array on the surface of the cloth cylinder 4. An adjusting cylinder 10 that reciprocates linearly is slidably installed inside the central column 2. The adjusting cylinder 10 is sleeved on the surface of the cloth cylinder 4. A plurality of second feeding ports 11 are formed on the lower surface of the adjusting cylinder 10. A control assembly is arranged at the rear end of the central column 2. By the control assembly, the overlapping area between the second feeding ports 11 and the first feeding ports 9 is adjusted. Referring to Figure 8 .

[0027] See Figure 4 , the control assembly includes a magnetic ring 12, a return spring 13 and an electromagnetic coil 14. The magnetic ring 12 is fixedly installed at the rear end of the adjusting cylinder 10. The two ends of the return spring 13 are respectively abutted against the magnetic ring 12 and the central column 2. The electromagnetic coil 14 is fixedly connected to the rear end of the central column 2 and is sleeved around the rear end of the cloth cylinder 4.

[0028] By sleeving the adjusting cylinder 10 outside the cloth cylinder 4, the electromagnetic coil 14 generates a magnetic thrust to drive the adjusting cylinder 10 to reciprocate, thereby changing the overlapping area between the second feeding ports 11 and the first feeding ports 9, so that it has the function of controlling the feeding speed at the first feeding ports 9 of the cloth cylinder 4. When the rotation speed of the rotating frame 6 is constant, it meets the usage requirements of different material coating speeds for the material to be plated, and improves the coating quality.

[0029] A threaded hole communicating with the cloth cylinder 4 is provided at the front end of the central column 2, and a feeding pipe 15 is threadedly installed in the threaded hole. A material storage groove 16 is provided on the surface of the feeding pipe 15. The plating material is in powder form and is stored in the material storage groove 16. The feeding pipe 15 is slidably inserted into the cloth cylinder 4, and the material storage groove 16 is adjusted to face downward. As Figure 7 shown, the material storage groove 16, the first material feeding port 9, the second material feeding port 11 and the diversion groove 5 form a material feeding channel. The plating material in the feeding pipe 15 enters the evaporation crucible 3 through the material feeding channel. Refer to Figure 6 , Figure 7 . The cloth cylinder 4 rotates in the direction of the dotted line rotation arrow in Figure 7 . When the first material feeding port 9 and the second material feeding port 11 overlap, the above-mentioned material feeding channel is in an open state. When the first material feeding port 9 and the second material feeding port 11 are completely staggered, the above-mentioned material feeding channel is in a closed state. That is, the rhythm of the plating material entering the evaporation crucible 3 is adjusted by driving the rotation of the cloth cylinder 4.

[0030] During the use process, after the vacuum chamber 1 is evacuated, the evaporation crucible 3 is energized to heat the plating material. The atoms or molecules of the plating material vaporize and escape from the surface to form a vapor flow, which impinges on the surface of the material to be plated and condenses to form a solid thin film. During this process, the servo motor 8 drives the rotating frame 6 and the cloth cylinder 4 to rotate at a differential speed. The material to be plated moves in a circular motion, reducing the distance difference between each point on the surface of the material to be plated and the evaporation source, making the coating thickness more uniform. At the same time, the cloth cylinder 4 rotates, so that the plating material is continuously input into the evaporation crucible 3 to replenish the consumed plating material.

[0031] It should be noted that to achieve vacuum coating, simply speaking, there must be a "hot" evaporation source, a "cold" substrate and a surrounding vacuum environment. The factors affecting the film thickness of vacuum coating are as follows: First, under the condition that the type of plating material and the distance between the center of the substrate and the evaporation source remain unchanged, the coating thickness increases linearly with the increase of the mass of the plating material. Second, under the condition of keeping the mass and type of the plating material unchanged, the thickness of the thin film obtained by vacuum evaporation coating is approximately inversely proportional to the square of the distance from the center of the substrate to the evaporation source. Other factors will not be elaborated here. See the reference: Gao Yan. Analysis of Factors Affecting the Film Thickness of Vacuum Evaporation Coating [J]. Taiyuan Science and Technology, 2008, (09): 78-79+82.

[0032] In this embodiment, the servo motor 8 drives the rotating frame 6 and the cloth cylinder 4 to rotate at a differential speed. During the rotation of the rotating frame 6, the distance between each point on the surface of the material to be plated and the evaporation source is changing. During the rotation of the cloth cylinder 4, the rhythm of the plating material entering the evaporation crucible 3 can be adjusted, so that the thermal evaporation amount of the plating material changes with the rotation angle of the material to be plated. That is, by adjusting the rotation speed of the servo motor 8, the rotation speed of the material to be plated and the input rhythm of the plating material are jointly controlled, achieving the effect of dynamically controlling the coating thickness and meeting the production requirements of automatic control.

[0033] The vacuum metal coating equipment proposed by the present invention drives the rotating frame 6 to rotate through the servo motor 8. The material to be coated is placed on the rotating frame 6. The coating material is thermally evaporated in the evaporation crucible 3 to form a coating on the surface of the material to be coated. The material to be coated is coated in a circular motion state, reducing the distance difference between each point on the surface of the material to be coated and the evaporation source, making the coating thickness more uniform, and solving the problem of uneven coating thickness in the existing vacuum metal coating equipment when coating materials with a relatively large plane.

[0034] In this embodiment, a cooling component for cooling the surface of the material to be coated is provided on the surface of the central column 2.

[0035] The cooling component includes a hollow roller 21, a cooling input pipe 22, and a cooling output pipe 23. The cooling input pipe 22 and the cooling output pipe 23 are fixedly installed at the rear end of the central column 2. An air cavity 24 is opened inside the central column 2. A movable plug 25 is slidably installed in the air cavity 24 (there is a gap between the movable plug 25 and the inner wall of the air cavity 24. When the inside of the vacuum chamber 1 is evacuated, the air in the air cavity 24 can be evacuated through this gap). A transmission rod is fixedly installed at the end of the movable plug 25. The hollow roller 21 is rotatably connected to the end of the transmission rod away from the movable plug 25. Rotating joints are rotatably installed at both ends of the hollow roller 21. The rotating joints at both ends are respectively communicated with the cooling input pipe 22 and the cooling output pipe 23 through hoses. When the movable plug 25 slides, the hollow roller 21 can extend from the central column 2 to contact the surface of the material to be coated and roll along the surface of the material to be coated.

[0036] A cleaning pipe 26 is fixedly installed at the rear end of the central column 2. An air passage hole 27 is opened inside the central column 2. The cleaning pipe 26 is communicated with the air cavity 24 through the air passage hole 27. A tension spring 28 is fixedly installed inside the air cavity 24. The end of the tension spring 28 is fixedly connected to the end of the movable plug 25.

[0037] By arranging the hollow roller 21 around the central column 2 and injecting water into the hollow roller 21, and the hollow roller 21 rolls along the surface of the material to be coated, the hollow roller 21 has the function of pre-cooling the surface of the material to be coated, which is convenient for the subsequent film forming. The extension of the hollow roller 21 to contact the material to be coated and the retraction of the hollow roller 21 into the central column 2 are automatically completed. That is, when the vacuum chamber 1 is evacuated and the cleaning pipe 26 injects clean air into the vacuum chamber 1 to wash the vacuum cavity, since the outside of the central column 2 is at negative pressure and the air cavity 24 is at positive pressure, at this time, the hollow roller 21 extends and contacts the material to be coated. When the inside of the vacuum chamber 1 is evacuated, the air pressure in the air cavity 24 decreases. Under the action of the tension spring 28, at this time, the hollow roller 21 retracts into the central column 2. Because heat transfer requires an air medium, this design enables the material to be coated to maintain a more persistent pre-cooling temperature after the inside of the vacuum chamber 1 is evacuated, providing favorable conditions for the condensation of the coating material vapor flow on the surface of the material to be coated and improving the coating quality.

[0038] It should be noted that the vacuum metal coating equipment proposed by the present invention has the function of cooling the surface of the material to be coated, and the rotating frame 6 can rotate cyclically, enabling it to perform secondary coating or multiple coatings on the coating surface to meet different coating requirements.

[0039] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A vacuum metal coating device for wood surface, comprising a vacuum chamber (1), characterized in that: Inside the vacuum chamber (1), a central column (2) is fixedly installed. An evaporation crucible (3) is embedded in the upper surface of the central column (2). Inside the central column (2), a cloth cylinder (4) is rotatably installed. A diversion groove (5) is formed inside the central column (2). The cloth cylinder (4) communicates with the inner cavity of the evaporation crucible (3) through the diversion groove (5). A rotating frame (6) is rotatably installed on the surface of the central column (2). A plurality of insertion cavities (7) are formed on the front side of the rotating frame (6). An annular groove is formed on the inner wall of the rotating frame (6). The insertion cavities (7) communicate with the inner cavity of the evaporation crucible (3) through the annular groove. A servo motor (8) is fixedly installed inside the vacuum chamber (1). The servo motor (8) drives the rotating frame (6) and the cloth cylinder (4) to rotate at different speeds; The material to be plated is inserted into the insertion cavity (7). A cooling assembly for cooling the surface of the material to be plated is arranged on the surface of the central column (2).

2. The wood surface vacuum metal coating equipment according to claim 1, characterized in that: A plurality of first feeding ports (9) are formed on the surface of the cloth cylinder (4). The plurality of first feeding ports (9) are arranged in an annular array on the surface of the cloth cylinder (4). An adjusting cylinder (10) that reciprocates linearly is slidably installed inside the central column (2). The adjusting cylinder (10) is movably sleeved on the surface of the cloth cylinder (4). A plurality of second feeding ports (11) are formed on the lower surface of the adjusting cylinder (10). A control assembly is arranged at the rear end of the central column (2). The overlapping area between the second feeding port (11) and the first feeding port (9) is adjusted through the control assembly.

3. The wood surface vacuum metal coating equipment according to claim 2, characterized in that: The control assembly includes a magnetic ring (12), a return spring (13), and an electromagnetic coil (14). The magnetic ring (12) is fixedly installed at the rear end of the adjusting cylinder (10). The two ends of the return spring (13) are respectively abutted against the magnetic ring (12) and the central column (2). The electromagnetic coil (14) is fixedly connected to the rear end of the central column (2), and the electromagnetic coil (14) is sleeved around the periphery of the rear end of the cloth cylinder (4).

4. A wood surface vacuum metal coating device according to claim 3, characterized in that: A threaded hole communicating with the cloth cylinder (4) is formed at the front end of the central column (2). A feeding pipe (15) is threadedly installed in the threaded hole. A storage groove (16) is formed on the surface of the feeding pipe (15). The feeding pipe (15) is slidably inserted into the cloth cylinder (4), and the storage groove (16) is adjusted to face downward. The storage groove (16), the first feeding port (9), the second feeding port (11), and the diversion groove (5) form a feeding channel. The plating material in the feeding pipe (15) enters the evaporation crucible (3) through the feeding channel.

5. The wood surface vacuum metal coating equipment according to claim 4, characterized in that: A gear (17) and a first synchronous pulley (18) are respectively fixedly installed at the rotating end of the servo motor (8). A gear ring (19) is fixedly installed at the rear end of the rotating frame (6). A second synchronous pulley (20) is fixedly installed at the rear end of the cloth cylinder (4). The gear (17) is in meshing transmission with the gear ring (19). The first synchronous pulley (18) and the second synchronous pulley (20) are in transmission through a synchronous belt. When the servo motor (8) drives the rotating frame (6) and the cloth cylinder (4) to rotate at different speeds, the rhythm of the plating material in the feeding pipe (15) entering the evaporation crucible (3) is adjusted by changing the speed of the differential rotation.

6. A wood surface vacuum metal coating device according to any one of claims 1-5, characterized in that: The cooling assembly includes a hollow roller (21), a cooling input pipe (22) and a cooling output pipe (23). The cooling input pipe (22) and the cooling output pipe (23) are fixedly installed at the rear end of the central column (2). An air cavity (24) is formed inside the central column (2). A movable plug (25) is slidably installed in the air cavity (24). A transmission rod is fixedly installed at the end of the movable plug (25). The hollow roller (21) is rotatably connected to the end of the transmission rod away from the movable plug (25). Rotating joints are rotatably installed at both ends of the hollow roller (21). The rotating joints at both ends are respectively communicated with the cooling input pipe (22) and the cooling output pipe (23) through hoses. When the movable plug (25) slides, the hollow roller (21) can extend out of the central column (2) to contact the surface of the material to be plated and roll along the surface of the material to be plated.

7. A wood surface vacuum metal coating device according to claim 6, characterized in that: A cleaning pipe (26) is fixedly installed at the rear end of the central column (2). An air passage hole (we27) is formed inside the central column (2). The cleaning pipe (26) is communicated with the air cavity (24) through the air passage hole (27). A tension spring (28) is fixedly installed inside the air cavity (24). The end of the tension spring (28) is fixedly connected to the end of the movable plug (25).

8. A wood surface vacuum metal coating device according to claim 7, characterized in that: An operation window is provided on the front surface of the vacuum chamber (1). A sealing door (29) is hingedly installed on the front surface of the vacuum chamber (1). The sealing door (29) covers the operation window. A locking knob is inserted into the sealing door (29). The locking knob is threadedly connected to the front surface of the vacuum chamber (1).

9. A wood surface vacuum metal coating device according to claim 8, characterized in that: An exhaust pipe (30) and an injection pipe (31) are respectively fixedly installed on the side surface of the vacuum chamber (1).

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