CN112657809A - Wooden furniture coating method considering environmental protection and economy - Google Patents
Wooden furniture coating method considering environmental protection and economy Download PDFInfo
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- CN112657809A CN112657809A CN202011501162.5A CN202011501162A CN112657809A CN 112657809 A CN112657809 A CN 112657809A CN 202011501162 A CN202011501162 A CN 202011501162A CN 112657809 A CN112657809 A CN 112657809A
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Abstract
The invention discloses a wooden furniture coating method considering environmental protection and economy, which comprises the following steps: firstly, polishing a wooden furniture white blank by using sand paper to be smooth; rolling and coating UV primer; thirdly, spraying PU priming paint; fourthly, spraying a mixed solvent by using a spray gun, wherein the mixed solvent comprises a water-based color modifier, a cross-linking agent and a colored paint, and spraying a water-based finish paint after drying for 2-3 minutes; and fifthly, drying, controlling the temperature to be 40-50 ℃ and the humidity to be 40-50%, and maintaining for 3-4 hours. The invention not only meets the environmental protection requirement of consumers, but also can control the production cost and improve the production efficiency.
Description
Technical Field
The invention relates to the technical field of coating methods for wooden furniture, in particular to a coating method for wooden furniture which is environmentally friendly and economical.
Background
The coating materials of the surface of the existing wooden furniture mainly comprise PU paint, UV paint, water paint and the like.
The PU paint, namely the oily paint, comprises a main agent, a curing agent and a diluent, is a general name of all polyurethane coatings, and has a natural film forming mode without a special process. The oil paint has excellent performances of corrosion resistance, water resistance, oil resistance, chemical resistance, light resistance, temperature resistance and the like, when the oil paint is coated on the surface of wooden furniture, the color, the gloss, the smoothness and the like of the oil paint can meet the requirements of consumers on the appearance of colorful furniture, and the effect of beautifying the living environment of human beings is achieved. And generally adopts the spraying mode to carry out coating, not only wastes materials, but also causes influence to the coating environment.
The UV paint is an ultraviolet light curing paint, also called as a photo-initiation paint, under the irradiation of ultraviolet light, an initiator is promoted to decompose to generate free radicals to initiate resin reaction, and is instantly cured to form a film. The UV paint is generally coated on the surface of the furniture board by automatic roller coating and curtain coating through machine equipment, so that the coating cost is low, the drying time is short, and the production efficiency is high. But the effect of the UV paint roller coating finish paint is slightly inferior to that of a PU finish paint product.
The water paint uses water as a solvent, can save a large amount of resources, is harmless to human bodies, does not pollute the environment, has a plump paint film, is glittering and translucent, has good flexibility, is used for coating wooden furniture, and has the characteristics of water resistance, wear resistance, aging resistance, yellowing resistance, quick drying, convenient use and the like. However, the price is high, and compared with oil paint, the single-component water paint has certain difference in hardness, high temperature resistance and other performances. And because the surface tension of water is large, dirt is easy to cause the film to generate shrinkage cavity, and the requirement on the cleanliness of the surface of the material in the construction process is high.
The conventional coating method includes:
60% of PU primer and 40% of water-based finish, the proportion of the PU primer is large, the PU primer needs to be sprayed for many times, and the coating efficiency is low;
40% of UV primer and 60% of PU finishing paint, and the PU finishing paint is directly exposed outside and is not environment-friendly;
the cost of the water-based primer and the water-based finish paint is too high.
Disclosure of Invention
The invention aims to provide a wooden furniture coating method which is environment-friendly and economical, can meet the environment-friendly requirement of consumers, can control the production cost and improve the production efficiency aiming at the respective advantages and disadvantages of the coating material.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wooden furniture coating method considering environmental protection and economy comprises the following steps:
firstly, polishing a wooden furniture white blank by using sand paper, filling a pit by using wooden putty, and airing at normal temperature;
rolling and coating UV primer twice each time, coating the single surface of the white blank twice, wherein the thickness of the UV primer is 18-22 square meters per kilogram, and polishing by using abrasive paper after curing and heating (a UV photocuring coating device is provided with a photocuring and abrasive paper polishing mechanism); in the step, when the white blank is an arc-shaped plate, manually coating UV primer by rolling; when the white blank is a flat plate, UV (ultraviolet) photocuring coating equipment is adopted for roll coating of the UV primer, but the curing of two different operation means can be realized in the UV photocuring coating equipment, the efficiency of the UV primer can be improved, and the time for drying is greatly shortened.
Thirdly, spraying PU primer, controlling the temperature to be 25-30 ℃, controlling the humidity to be 50% -70%, wherein the thickness of the PU primer is 2-4 square meters per kilogram, and after drying, polishing the PU primer by using abrasive paper until the surface is smooth and has no particles; the PU paint is only needed to be coated once, so that the time and the materials are saved, the PU paint is used for filling the positions where the corners are not coated after the UV primer is coated by rolling, and meanwhile, scratches and the like can be filled. The UV paint is used for replacing a part of PU paint, so that the cost is reduced, the pollution is reduced, the environment is protected, the use amount of the PU paint is reduced, the UV paint coating efficiency is high, and the whole coating time is greatly shortened.
Spraying a mixed solvent by using a spray gun, wherein the mixed solvent comprises a water-based color modifier, a cross-linking agent and a colored paint, the temperature is controlled to be 25-30 ℃, the humidity is 50-70%, a water-based finish paint is sprayed after drying for 2-3 minutes, the thickness of the water-based finish paint is 3-5 square meters per kilogram, and the water-based finish paint is dried for 2-3 hours;
and fifthly, drying, controlling the temperature to be 40-50 ℃ and the humidity to be 40-50%, and maintaining for 3-4 hours.
The mass ratio of the water-based color modifier to the cross-linking agent to the colored paint is 500:10: 1.
The aqueous color modifier comprises 30 wt% of aqueous acrylic emulsion, 68.5 wt% of ethanol, 0.5 wt% of defoaming agent and 1 wt% of wetting agent, and the crosslinking agent is aziridine crosslinking agent. The aziridine crosslinking agent (XR-100) can react with carboxyl at room temperature, and the polyfunctional aziridine crosslinking agent is a crosslinking agent containing a carboxyl system, can be cured at room temperature and can also be cured by heating and baking, so that the water resistance, the anti-friction property, the alcohol resistance, the anti-sticking property, the adhesive force and the chemical resistance of the water paint coating can be improved. The cross-linking agent belongs to an environment-friendly cross-linking agent, no harmful substances such as formaldehyde and the like are emitted after cross-linking, and a cross-linked finished product is non-toxic and tasteless.
The defoaming agent is preferably a polyether siloxane defoaming agent or a mineral oil defoaming agent, the source of the defoaming agent is not specially required, and the defoaming agent is a commercial product, namely TEGO810 from TEGO company or a product of AIREX901w from BYK022 or BYK093 from Bike company. The defoaming agent can destroy the balance between gas and liquid interfaces, and promote the bubbles to break the bubbles rapidly when the bubbles move to the liquid level, so that the phenomenon that the color modifier generates color due to the bubbles breaking out of the liquid is prevented.
The wetting agent is preferably an acrylic wetting agent, the wetting agent is not specially required by the invention, and a commercial product can be adopted, and the wetting agent in the embodiment is TEGO245 of TEGO company or Dynol604 of air products company. The wetting agent can reduce the surface tension of a paint film, so that the color modifier and the color concentrate can be effectively spread on the surface of the wood material, and the drying time is shortened.
The main component of the water-based color modifier is ethanol, the water-based color modifier is easy to volatilize and dry quickly, and can dilute colored paint, only a few drops of colored paint need to be dripped into 1 kilogram of the water-based color modifier, the colored paint is used for painting white blanks, the cross-linking agent plays a role in curing, so that the PU paint cannot volatilize, the cross-linking agent is used for spraying subsequent water-based finish paint, and otherwise, oil-water separation and separation can be realized.
The water-based finish paint is any one of acrylic acid, acrylic acid and polyurethane composition and polyurethane
Spraying PU priming paint, spraying mixed solvent and drying are all carried out in a constant temperature and humidity device, the drying is rotary air blowing type drying, the top of the constant temperature and humidity device is provided with an air energy heat pump for heating the inside of the constant temperature and humidity device and a dehumidifying device for regulating and controlling the humidity in the constant temperature and humidity device, the air energy heat pump comprises a condenser positioned in the constant temperature and humidity device, a partition wall surrounding the condenser is arranged in the constant temperature and humidity device, one side of the partition wall is provided with an air inlet hole, the other side of the partition wall is provided with a plurality of fans, the bottom of the constant temperature and humidity device is provided with a motor, the motor is provided with a rotating shaft vertically extending upwards, the rotating shaft is connected with a white blank frame, the white blank frame comprises a shaft sleeve connected with the rotating shaft key and a plurality of frame inner rings which are distributed at equal intervals and are concentrically arranged with the shaft sleeve, and the two adjacent frame inner rings are connected through a, the support upright stanchion and the shaft sleeve which are positioned below are connected through a connecting rod, the periphery of each frame inner ring is connected with a frame outer ring through an extension rod, the white blank is placed on a frame formed by the frame inner rings, the extension rods and the frame outer rings, the partition wall is provided with air outlet pipes which are in one-to-one correspondence with the fans, the air outlet pipes are provided with bellmouths for air outlet along the length direction, and the bellmouths are opposite to the white blank from top to bottom.
The upper air outlet pipe is provided with a downward-opening horn mouth along the length direction, the lower air outlet pipe is provided with an upward-opening horn mouth along the length direction, the other air outlet pipes are provided with vertically-symmetrical horn mouths along the length direction, the upward-opening horn mouth and the downward-opening horn mouth are alternately opened and closed under the control of an electromagnetic valve, the extension lines L1 of two adjacent upward-opening horn mouths intersect at the upper end face of the extension rod above the adjacent two upward-opening horn mouths, and the extension lines L2 of two adjacent downward-opening horn mouths intersect at the upper end face of the extension rod below the adjacent two downward-opening horn mouths.
The motor in the constant temperature and humidity device rotates forwards and backwards alternately, the forward rotation time and the reverse rotation time are both 30 minutes, the bell mouth with the opening upwards is used for air outlet in the forward rotation process, and the bell mouth with the opening downwards is used for air outlet in the reverse rotation process.
The air energy heat pump further comprises an air compressor, an expansion valve and an evaporator, wherein the air compressor, the expansion valve and the evaporator are located outside the constant temperature and humidity device, the air compressor is connected with a condenser located inside the constant temperature and humidity device through a pipeline, the output end of the condenser is connected with the expansion valve through a pipeline, the output end of the expansion valve is connected with the evaporator through a pipeline, and the output end of the evaporator is connected with the air compressor through a pipeline.
Stagger the distribution from top to bottom between two adjacent outlet ducts, be connected with the stiffener between two adjacent extension rods, the axle sleeve cover is established in the pivot and is twisted the nut of pivot upper end through the spiral and compress tightly the up end of axle sleeve, one side of constant temperature and humidity device is equipped with the room door that is used for switching constant temperature and humidity device.
The white blank is a clamping plate, a density board, solid wood or a shaving board.
Compared with the prior art, the invention has the following outstanding advantages and positive effects: not only can meet the environmental protection requirement of consumers, but also can control the production cost and improve the production efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is a top view of the blank frame of the present invention;
fig. 4 is a schematic view of the installation of the outlet pipe of the present invention.
In the figure: the device comprises a constant temperature and humidity device 1, a partition wall 11, a chamber door 12, an air inlet 13, an air compressor 2, a condenser 21, an expansion valve 22, an evaporator 23, a dehumidifying device 3, a fan 4, an air outlet pipe 41, a bell mouth 42, a motor 5, a rotating shaft 51, a nut 52, a shaft sleeve 6, a frame inner ring 61, a connecting rod 62, a supporting upright rod 63, a frame outer ring 64, an extension rod 65, a reinforcing rod 66 and a white blank 7.
Detailed Description
The invention is further described below with reference to specific embodiments:
as shown in fig. 1 to 4, a method for coating wooden furniture, which is environmentally friendly and economical, comprises the following steps:
firstly, polishing a wooden furniture white blank 7 by using sand paper, filling a pit by using wooden putty, and airing at normal temperature;
rolling and coating UV primer twice each time, passing one side of the white blank 7 twice, wherein the thickness of the UV primer is 18-22 square meters per kilogram, and polishing by using sand paper after curing and heating; the UV primer is decomposed by the initiator under the irradiation of ultraviolet light to generate free radicals, so that resin reaction is initiated, and the UV primer is instantly cured to form a film, is high and stable in curing speed and is suitable for assembly line operation.
Thirdly, spraying PU primer, controlling the temperature to be 25-30 ℃, controlling the humidity to be 50% -70%, wherein the thickness of the PU primer is 2-4 square meters per kilogram, and after drying, polishing the PU primer by using abrasive paper until the surface is smooth and has no particles; the UV paint and the PU paint are both oil paint.
Spraying a mixed solvent by using a spray gun, wherein the mixed solvent comprises a water-based color modifier, a cross-linking agent and a colored paint, the temperature is controlled to be 25-30 ℃, the humidity is 50-70%, a water-based finish paint is sprayed after drying for 2-3 minutes, the thickness of the water-based finish paint is 3-5 square meters per kilogram, and the water-based finish paint is dried for 2-3 hours; on one hand, the water-based paint reduces the using amount of the PU paint, and the PU paint is covered in the water-based paint, so that the volatile matter of the PU paint is reduced; and secondly, the glossiness is improved, and the production efficiency is improved (after the water-based finish paint is used, the water-based finish paint can be heated and dried, and the use time is short).
The mass ratio of the water-based color modifier to the cross-linking agent to the colored paint is 500:10: 1.
The aqueous color modifier comprises 30 wt% of aqueous acrylic emulsion, 68.5 wt% of ethanol, 0.5 wt% of defoaming agent and 1 wt% of wetting agent, and the crosslinking agent is aziridine crosslinking agent.
The PU primer spraying, the mixed solvent spraying and the water-based finish spraying are all carried out in the constant temperature and humidity device 1, and the steps are all carried out at the periphery of the rotary air blowing device, namely in the area outside the extension rod 65.
And fifthly, drying, controlling the temperature to be 40-50 ℃ and the humidity to be 40-50%, and maintaining for 3-4 hours. The drying is rotary air blowing type drying in the constant temperature and humidity device 1.
The water-based finish paint is any one of acrylic acid, acrylic acid and polyurethane composition and polyurethane
The top of constant temperature and humidity device 1 is equipped with the air energy heat pump that heaies up to constant temperature and humidity device 1 inside, the air energy heat pump is including being located the condenser 21 of constant temperature and humidity device 1 inside, the air energy heat pump still includes air compressor machine 2, expansion valve 22 and evaporimeter 23, air compressor machine 2, expansion valve 22 and evaporimeter 23 are located the outside of constant temperature and humidity device 1, and air compressor machine 2 is located the condenser 21 of constant temperature and humidity device 1 inside through the pipe connection, the output of condenser 21 passes through pipe connection expansion valve 22, the output of expansion valve 22 passes through pipe connection evaporimeter 23, the output of evaporimeter 23 passes through pipe connection air compressor machine 2. The related art of the air energy heat pump is the prior art and will not be described in detail herein.
The constant temperature and humidity device 1 is internally provided with a partition wall 11 which surrounds the condenser 21, one side of the partition wall 11 is provided with an air inlet 13, the other side of the partition wall 11 is provided with a plurality of fans 4, the partition wall 11 is provided with air outlet pipes 41 which are in one-to-one correspondence with the fans 4, air is fed through the air inlet 13, the inlet air temperature is raised, and the air is blown out through the air outlet pipes 41.
The bottom of constant temperature and humidity device 1 is equipped with motor 5, be equipped with the pivot 51 of upwards vertical extension on motor 5, the key connection has white base frame in the pivot 51, white base frame includes axle sleeve 6 with the key-type connection of pivot 51, the frame inner ring 61 that a plurality of equidistant distributions from top to bottom that set up with axle sleeve 6 with one heart, and the key-type connection is prior art, 6 covers of axle sleeve are established on pivot 51 and are twisted the nut 52 of pivot 51 upper end through the spiral and compress tightly the up end of axle sleeve 6.
Two adjacent frame inner rings 61 from top to bottom are connected through a plurality of support pole setting 63 of circumference equipartition between, are located and are connected through connecting rod 62 between support pole setting 63 and the axle sleeve 6 of below, and a plurality of support pole setting 63 of lower extreme circumference equipartition of a frame inner ring 61 at the bottom promptly are connected through connecting rod 62 between axle sleeve 6 and a plurality of support pole setting 63, and connecting rod 62 has upper, middle and lower three-layer, and the intensity of white base frame has been guaranteed to multilayer connecting rod 62.
The periphery of each frame inner ring 61 is connected with a frame outer ring 64 through an extension rod 65, the white blank 7 is placed on a frame formed by the frame inner rings 61, the extension rods 65 and the frame outer rings 64, and the motor 5 rotates to drive the white blank frame to rotate.
And a bell mouth 42 for air outlet is arranged on the air outlet pipe 41 along the length direction of the air outlet pipe, and the bell mouth 42 is vertically opposite to the white blank 7. Namely, the bell mouth 42 is discharged to directly dry the white blank 7.
A downward opening bell mouth 42 is arranged on one air outlet pipe 41 positioned above along the length direction, an upward opening bell mouth 42 is arranged on one air outlet pipe 41 positioned below along the length direction, the other air outlet pipes 41 are provided with vertically symmetrical bell mouths 42 along the length direction, and the upward opening bell mouth 42 and the downward opening bell mouth 42 are controlled by an electromagnetic valve to be opened and closed alternately. I.e., the upwardly opening flare 42 and the downwardly opening flare 42 do not operate simultaneously. Specifically, the forward rotation and the reverse rotation of the motor 5 in the constant temperature and humidity device 1 are alternately performed, the forward rotation time and the reverse rotation time are both 30 minutes, the bell mouth 42 with the upward opening is used for air outlet in the forward rotation, and the bell mouth 42 with the downward opening is used for air outlet in the reverse rotation. The upwardly open bell mouth 42 blows air against the lower end face of the white blank 7 and the downwardly open bell mouth 42 blows air against the upper end face of the white blank 7. Extension lines L1 of two adjacent upwardly open flares 42 intersect at the upper end surface of the extension rod 65 located above it, and extension lines L2 of two adjacent downwardly open flares 42 intersect at the upper end surface of the extension rod 65 located below it. Therefore, the upper end surface and the lower end surface of the white blank 7 can be completely blown by air, the drying effect is good, and paint is not easy to drop in the later period.
Two adjacent air outlet pipes 41 are distributed in a vertically staggered manner. The air outlet pipes 41 are ensured not to interfere with each other, and the utilization rate of the air is improved as much as possible.
A reinforcing rod 66 is connected between two adjacent extension rods 65.
And a dehumidifying device 3 for regulating and controlling the humidity in the constant temperature and humidity device 1 is arranged at the top of the constant temperature and humidity device 1. The dehumidifying device 3 is used for controlling the humidity in the constant temperature and humidity device 1 to be 40% -50%, and the constant temperature and humidity device 1 can also regulate and control the temperature, which are all the prior art and will not be described in detail herein.
And a chamber door 12 for opening and closing the constant temperature and humidity device 1 is arranged on one side of the constant temperature and humidity device 1.
The white blank 7 is a clamping plate, a density board, a solid wood or a shaving board.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The wooden furniture coating method which is environmentally friendly and economical is characterized by comprising the following steps:
firstly, polishing a wooden furniture white blank (7) by using sand paper, filling a pit by using wooden putty, and airing at normal temperature;
rolling and coating UV primer twice each time, passing one side of the white blank (7) twice, wherein the thickness of the UV primer is 18-22 square meters per kilogram, and polishing by using sand paper after curing and heating;
thirdly, spraying PU primer, controlling the temperature to be 25-30 ℃, controlling the humidity to be 50% -70%, wherein the thickness of the PU primer is 2-4 square meters per kilogram, and after drying, polishing the PU primer by using abrasive paper until the surface is smooth and has no particles;
spraying a mixed solvent by using a spray gun, wherein the mixed solvent comprises a water-based color modifier, a cross-linking agent and a colored paint, the temperature is controlled to be 25-30 ℃, the humidity is 50-70%, a water-based finish paint is sprayed after drying for 2-3 minutes, the thickness of the water-based finish paint is 3-5 square meters per kilogram, and the water-based finish paint is dried for 2-3 hours;
and fifthly, drying, controlling the temperature to be 40-50 ℃ and the humidity to be 40-50%, and maintaining for 3-4 hours.
2. A method for painting wooden furniture, which is environmentally friendly and economical, as claimed in claim 1, wherein the mass ratio of the aqueous color modifier, the cross-linking agent and the color paint is 500:10: 1.
3. An environmentally friendly and economical method of coating wooden furniture as claimed in claim 1, wherein said aqueous color modifier comprises 30 wt% aqueous acrylic emulsion, 68.5 wt% ethanol, 0.5 wt% defoamer and 1 wt% wetting agent, and said crosslinker is aziridine crosslinker.
4. A method for coating wooden furniture, which is environmentally friendly and economical, as claimed in claim 1, wherein the water-based finish paint is any one of acrylic, acrylic and polyurethane composite, and polyurethane.
5. The wooden furniture coating method combining environmental protection and economy as claimed in claim 1, wherein the PU primer coating, the solvent mixture coating and the drying are all performed in a constant temperature and humidity device (1), the drying is a rotary blowing type drying, the top of the constant temperature and humidity device (1) is provided with an air energy heat pump for heating the inside of the constant temperature and humidity device (1) and a dehumidifier (3) for humidity control in the constant temperature and humidity device (1), the air energy heat pump comprises a condenser (21) located in the constant temperature and humidity device (1), a partition wall (11) surrounding the condenser (21) is arranged in the constant temperature and humidity device (1), one side of the partition wall (11) is provided with a plurality of air inlets (13), the other side of the partition wall (11) is provided with a plurality of fans (4), the bottom of the constant temperature and humidity device (1) is provided with a motor (5), the air conditioner is characterized in that a rotating shaft (51) which extends upwards and vertically is arranged on the motor (5), a white blank frame is connected to the rotating shaft (51) in a key mode, the white blank frame comprises a shaft sleeve (6) in key connection with the rotating shaft (51) and a plurality of frame inner rings (61) which are concentrically arranged with the shaft sleeve (6) and distributed at equal intervals from top to bottom, the two adjacent frame inner rings (61) from top to bottom are connected through a plurality of supporting vertical rods (63) which are uniformly distributed in the circumferential direction, the supporting vertical rods (63) and the shaft sleeve (6) which are positioned below are connected through connecting rods (62), the periphery of each frame inner ring (61) is connected with a frame outer ring (64) through extension rods (65), the white blanks (7) are placed on a frame formed by the frame inner rings (61), the extension rods (65) and the frame outer rings (64), air outlet pipes (41) which correspond to the fans (4) one by one are arranged on the partition walls (11), and bell mouths (42, the bell mouth (42) is opposite to the white blank (7) up and down.
6. A method for painting wooden furniture which is environmentally friendly and economical as claimed in claim 5, wherein a downwardly open bell mouth (42) is provided along the length direction of one of the upper outlet pipes (41), an upwardly open bell mouth (42) is provided along the length direction of one of the lower outlet pipes (41), bell mouths (42) which are upwardly open are provided along the length direction of the other outlet pipes (41), the other outlet pipes (41) are provided with bell mouths (42) which are vertically symmetrical along the length direction thereof, the upwardly open bell mouths (42) and the downwardly open bell mouths (42) are alternately opened and closed by the control of an electromagnetic valve, the extension lines L1 of two adjacent upwardly open bell mouths (42) intersect with the upper end surface of the extension rod (65) which is located above the upper end surface, and the extension lines L2 of two adjacent downwardly open bell mouths (42) intersect with the upper end surface of the extension rod (65) which is located below the upper end.
7. A method for painting wooden furniture, which is environmentally friendly and economical, as claimed in claim 5, wherein the motor (5) in the constant temperature and humidity device (1) is alternately rotated in forward and reverse directions, each time the forward rotation time and the reverse rotation time are both 30 minutes, the bell mouth (42) which is open upward is vented in the forward rotation, and the bell mouth (42) which is open downward is vented in the reverse rotation.
8. A wood furniture coating method with environmental protection and economy as claimed in claim 5, wherein the air energy heat pump further comprises an air compressor (2), an expansion valve (22) and an evaporator (23), the air compressor (2), the expansion valve (22) and the evaporator (23) are located outside the constant temperature and humidity device (1), the air compressor (2) is connected with a condenser (21) located inside the constant temperature and humidity device (1) through a pipeline, the output end of the condenser (21) is connected with the expansion valve (22) through a pipeline, the output end of the expansion valve (22) is connected with the evaporator (23) through a pipeline, and the output end of the evaporator (23) is connected with the air compressor (2) through a pipeline.
9. A wood furniture coating method taking environmental protection and economy into consideration as claimed in claim 5, characterized in that two adjacent air outlet pipes (41) are distributed in a vertically staggered manner, a reinforcing rod (66) is connected between two adjacent extension rods (65), the shaft sleeve (6) is sleeved on the rotating shaft (51) and compresses the upper end surface of the shaft sleeve (6) through a nut (52) screwed into the upper end of the rotating shaft (51), and a chamber door (12) for opening and closing the constant temperature and humidity device (1) is arranged on one side of the constant temperature and humidity device (1).
10. An environmentally friendly and economical method of coating wooden furniture according to claim 1, characterized in that the blank (7) is plywood, density board, solid wood or particle board.
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