A method and apparatus for embrittlement spray coating on the surface of a fixture

Abstract

This invention relates to a method for embrittlement of the paint layer on the surface of a spraying fixture, comprising the following steps: S1, suspending the spraying fixture in a sealed space; S2, adjusting the distance between the ultraviolet light source and the spraying fixture, and adjusting the irradiation angle of the ultraviolet light; S3, setting the wavelength of the ultraviolet light to 320-380nm; S4, irradiating the outer surface of the spraying fixture with ultraviolet light for 6-10 minutes. By selecting a specific wavelength of ultraviolet light to act on the paint layer on the surface of the spraying fixture, the paint layer is embrittled in a short time, thereby changing the adhesion between the paint layer and the fixture surface. This makes it easier for the operator to remove the paint layer using auxiliary tools, while avoiding deformation of the spraying fixture and the generation of polluting gases or liquids throughout the entire process of embrittlement.

Description

Technical Field

[0001] This invention relates to the field of paint removal technology, and more particularly to a method and apparatus for embrittlement of the paint layer on the surface of a spray-coated fixture. Background Technology

[0002] Whether it's plastic or metal products, after molding, the surface needs to be painted. During the painting process, the workpiece needs to be suspended using hook fixtures or supported using custom fixtures. Therefore, when operators or robots use spray guns to paint the workpiece, paint mist sprayed from the gun will fall and spray onto the surface of the fixture. After painting, the fixture and workpiece will enter a drying equipment together for drying. The longer the fixture is used, the thicker the paint layer on its surface becomes, leading to a decrease in fixture performance. Especially for custom fixtures, the paint layer makes it impossible to identify the fixture model and hinders unified management. Therefore, it is necessary to treat the paint layer on the fixture surface. There are two existing treatment methods: the first is to incinerate the paint layer; the second is to dilute and dissolve the paint layer with chemicals. The first method has negative consequences because the high incineration temperature can easily cause deformation of the fixture, rendering it unusable. Furthermore, the combustion produces a large amount of smoke that pollutes the environment. Although the second treatment method does not produce smoke or deform the fixture, the liquid produced after dilution and dissolution will still cause varying degrees of environmental pollution.

[0003] For example, Chinese patent CN116333524A discloses a cleaning agent and its application method for removing paint from the surface of stone artifacts. The cleaning agent comprises the following components by weight percentage: benzyl alcohol 30-35%; anisole 30-35%; hydrogen peroxide 20-30%; hexadecyltrimethylammonium bromide 3-8%; and methylcellulose 1-3%. In this invention, anisole acts as a co-solvent, hydrogen peroxide as an accelerator, hexadecyltrimethylammonium bromide as a surfactant, and methylcellulose as a thickener. The components work synergistically, allowing the solvent with strong penetrating power to penetrate into the molecular chains of the paint film, causing some chemical bonds to break. This leads to swelling and softening of the paint film, disrupting the spatial structure of the paint film molecules and reducing its adhesion to the substrate, thus separating it from the substrate and achieving the purpose of removal. The cleaning agent does not chemically react with the stone itself, does not damage the stone artifacts, has good cleaning effect, and leaves no residue. However, the volatility of benzyl alcohol can have a certain impact on the environment. Benzyl alcohol decomposes slowly in nature and is toxic to aquatic organisms, which may pollute water bodies.

[0004] For example, Chinese patent CN108787636A discloses a method for removing paint from the surface of composite materials using laser, which includes the following steps: S1: Adjust the average output power of the laser to 150-200W;

[0005] S2: Adjust the laser repetition frequency to 10-20kHz; S3: Adjust the laser pulse width to 60-120ns; S4: Adjust the laser spot diameter reaching the object to be cleaned to 0.5-1mm; S5: Adjust the scanning galvanometer frequency to 40-50Hz; S6: Adjust the vibration amplitude of the scanning galvanometer; S7: Adjust the laser spot travel speed on the surface of the object to be cleaned. By adjusting the laser scanning parameters, including the spot area (spot diameter and spot length), laser repetition frequency, scanning galvanometer frequency, scanning galvanometer vibration amplitude, laser power, and pulse width, the waste paint layer on the surface of the composite material can be effectively removed. Based on the power, frequency, and other related technical parameters described in the above technical solution, it can be determined that the invention uses an infrared laser with a wavelength between 700-1100nm. Therefore, it is known that the laser emits a limited spot area, which can only process small areas of paint. However, it is inefficient for processing large areas of paint on the surface of spraying fixtures, and cannot meet the needs of industrial applications. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a more environmentally friendly and faster method and apparatus for embrittlement of the paint layer on the surface of a spray coating fixture.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a method for embrittlement of the paint layer on the surface of a spray-coated fixture, comprising the following steps:

[0008] S1. Suspend the spraying fixture in a closed space;

[0009] S2. Adjust the distance between the ultraviolet light source and the spraying fixture, and adjust the angle of ultraviolet irradiation;

[0010] S3. Set the wavelength of ultraviolet light to 320-380nm;

[0011] S4. The ultraviolet light should be irradiated on the outer surface of the spraying fixture for 6-10 minutes.

[0012] As a further part of the present invention, the wavelength of the ultraviolet light is 340-360nm.

[0013] As a further part of the present invention, the wavelength of the ultraviolet light is 360-370nm.

[0014] As a further aspect of the present invention, the irradiation angle of the ultraviolet light is adjustable in the range of 0-180°.

[0015] The present invention also provides an apparatus for embrittlement of the paint layer on the surface of a spraying fixture; comprising a hollow chamber and a circulation system for circulating air within the chamber, wherein a hook for suspending the spraying fixture is provided in the middle of the chamber, and support frames are symmetrically and vertically installed on both sides of the hook, and UV lamp boxes are arranged opposite each other on the two support frames, wherein ultraviolet rays emitted by the UV lamp boxes irradiate the surface of the spraying fixture on the hook.

[0016] As a preferred embodiment of the present invention, the support frame includes a support rod vertically installed inside the room, the support rod being located on one side of the hook and adjacent to the side wall of the room; a connecting rod is horizontally connected to the support rod via a connector, and the connecting rod is provided with an adjustable adjusting rod via the connector, and the UV lamp box is fixedly installed at the end of the adjusting rod.

[0017] As a preferred embodiment of the present invention, the adjusting rod is provided with a scale bar.

[0018] As a preferred embodiment of the present invention, a connecting part is integrally formed on the end of the adjusting rod, and a connecting seat is rotatably mounted on the connecting part by means of a shaft and a hole. The UV lamp box is fixedly mounted on the connecting seat. The connecting part is provided with a through hole in the radial direction. The connecting seat is provided with a number of through holes that are evenly distributed in a circle and are adapted to the insertion hole. A pin is inserted into the through hole and the through hole.

[0019] As a preferred embodiment of the present invention, the connector includes a body and quick clamps integrally formed with both ends of the body. A pressure plate is rotatably mounted on one end of the quick clamp, and a locking rod is rotatably mounted on the other end of the quick clamp. A slot adapted to the locking rod is provided at one end of the pressure plate. Both the quick clamp and the pressure plate are provided with arc-shaped receiving grooves. A nut is threadedly connected to the locking rod, and the nut abuts against the pressure plate.

[0020] As a preferred embodiment of the present invention, the circulation system includes return air ducts installed on both sides of the room and supply air ducts installed on the top of the room. One end of the supply air duct is connected to the top of the room and the other end is connected to a circulating fan. One end of the return air duct is connected to the side wall of the room and the other end is connected to an air processor. The air outlet of the air processor is connected to the air inlet of the circulating fan.

[0021] The beneficial effects of the present invention are as follows: 1. By selecting a specific wavelength of ultraviolet light to act on the paint layer on the surface of the spraying fixture, the paint layer is made brittle in a short time, thereby changing the adhesion between the paint layer and the surface of the fixture. This makes it easier for the operator to remove the paint layer with auxiliary tools. At the same time, the deformation of the spraying fixture and the generation of polluting gases or liquids are avoided during the entire process of brittle paint layer.

[0022] 2. By adjusting the distance between the two ultraviolet light sources, two purposes are taken: first, to accommodate spraying fixtures of different sizes, and second, to adjust the distance between the ultraviolet light sources and the surface of the spraying fixture, thus maximizing the energy of the ultraviolet rays.

[0023] 3. By adjusting the angle of ultraviolet radiation, ultraviolet rays are prevented from reaching the interior of the spraying fixture, thus protecting the areas of the spraying fixture without a paint layer.

[0024] 4. The circulation system effectively removes harmful gases produced by the paint layer under ultraviolet light, preventing operators from inhaling them when entering the booth to retrieve spraying fixtures. Attached Figure Description

[0025] Figure 1 This is a flowchart illustrating the present invention.

[0026] Figure 2 This is a front view of the embrittlement apparatus of the present invention.

[0027] Figure 3 This is a side view of the embrittlement apparatus of the present invention.

[0028] Figure 4 This is a front view of the adjusting rod of the present invention.

[0029] Figure 5 This is a front view of the connector of the present invention.

[0030] Reference numerals: 01. Body, 02. Circulation system, 03. Hook, 04. Support frame, 05. UV light box, 06. Support rod, 07. Connecting rod, 08. Connector, 09. Adjusting rod, 10. Scale strip, 11. Connecting part, 12. Connecting seat, 13. Through hole, 14. Quick clamp, 15. Pressure plate, 16. Locking rod, 17. Receiving groove, 18. Nut, 19. Return air duct, 20. Supply air duct, 21. Air processor, 22. Circulating fan. Detailed Implementation

[0031] The technical solutions of the present invention will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0032] Please see Figure 1As shown, this invention relates to a method for embrittlement of the paint layer on the surface of a spraying fixture. First, the spraying fixture is suspended in a sealed space. Second, the distance between the ultraviolet (UV) light source and the spraying fixture, as well as the UV irradiation angle, are adjusted. Adjusting the distance between the two UV light sources serves two purposes: first, to accommodate spraying fixtures of different sizes, and second, to adjust the distance between the UV light source and the surface of the spraying fixture, maximizing the energy of the UV rays. Simultaneously, adjusting the UV irradiation angle prevents UV rays from reaching the interior of the spraying fixture, protecting areas without paint. Next, the wavelength of the UV rays is adjusted to 320-380 nm. Finally, the UV rays irradiate the paint layer on the outer surface of the spraying fixture for 6-10 minutes, causing the paint layer on the outer surface of the spraying fixture to become embrittled, altering the adhesion between the paint layer and the fixture surface. This allows the paint layer to be easily cleaned using a scraper or other auxiliary tools after embrittlement. By applying ultraviolet light of a specific wavelength to the paint layer on the surface of the spraying fixture, the paint layer becomes brittle in a short time, thus changing the adhesion between the paint layer and the fixture surface. This makes it easier for the operator to remove the paint layer using auxiliary tools. At the same time, the entire process of brittlening the paint layer avoids deformation of the spraying fixture and the generation of gases or liquids that pollute the environment.

[0033] The ultraviolet (UV) irradiation angle ranges from 0 to 180°. When the UV irradiation direction is horizontal, the irradiation angle is 90°; when the UV irradiation direction is vertically upward, the irradiation angle is 0°; and when the UV irradiation direction is vertically downward, the irradiation angle is 180°. Adjusting the UV irradiation angle ensures that the UV rays act on the paint layer on the surface of the fixture and do not penetrate into the fixture itself.

[0034] In Example 1, the fixture was placed in a sealed space. The distance from the ultraviolet light source to the fixture surface was adjusted to 260 mm, and the ultraviolet irradiation angle was adjusted to 125°, ensuring that the ultraviolet light could fully act on the paint layer on the outer surface of the fixture. The circuit control module was adjusted to emit ultraviolet light with a wavelength of 320-340 nm. The ultraviolet light irradiated the paint layer on the outer surface of the fixture for 6 minutes. The sprayed fixture was then removed, and the paint layer on the fixture surface was tested using a coating adhesion tester. The test result was grade 3B. This corresponds to ISO grade 2 = ASTM grade 3B, meaning that the area of ​​peeling at the cut and intersecting edges is greater than 5% and less than 15%.

[0035] Example 2 differs from Example 1 in that the ultraviolet light irradiation time on the outer surface paint layer of the fixture is 8 minutes and 10 minutes. The paint layer on the fixture surface is tested using a coating adhesion tester, and the test result is also grade 3B. This corresponds to ISO grade 2 = ASTM grade 3B, meaning that the area of ​​peeling at the cut and intersecting edges is greater than 5% and less than 15%.

[0036] In the two embodiments described above, the operator can remove 30%-40% of the paint layer on the surface of the fixture using auxiliary tools.

[0037] In Example 3, the fixture was placed in a sealed space. The distance from the ultraviolet light source to the fixture surface was adjusted to 260 mm, and the ultraviolet irradiation angle was adjusted to 125°, ensuring that the ultraviolet light could fully act on the paint layer on the outer surface of the fixture. The circuit control module was adjusted to emit ultraviolet light with a wavelength of 340-360 nm. The ultraviolet light irradiated the paint layer on the outer surface of the fixture for 6 minutes. The sprayed fixture was then removed, and the paint layer on the fixture surface was tested using a coating adhesion tester. The test result was grade 3B. This corresponds to ISO grade 2 = ASTM grade 3B, meaning that the area of ​​peeling at the cut and intersecting edges is greater than 5% and less than 15%.

[0038] Example 4 differs from Example 1 in that the ultraviolet light irradiation time on the outer surface paint layer of the fixture is 8 minutes. The paint layer on the fixture surface is tested using a coating adhesion tester, and the test result is also grade 2B. This corresponds to ISO grade 3 = ASTM grade 3B, indicating partial or large-area paint peeling along the cut edges, and even some grid sections being completely peeled off, with the peeling area exceeding 15% but not exceeding 35%.

[0039] In the two embodiments described above, the operator can remove 50%-60% of the paint layer on the surface of the fixture using auxiliary tools.

[0040] In Example 5, the fixture was placed in a sealed space. The distance between the ultraviolet light source and the fixture surface was adjusted to 260 mm, and the ultraviolet irradiation angle was adjusted to 125°, ensuring that the ultraviolet light could fully act on the paint layer on the outer surface of the fixture. The circuit control module was adjusted to emit ultraviolet light with a wavelength of 360-370 nm. The ultraviolet light irradiated the paint layer on the outer surface of the fixture for 6 minutes. The sprayed fixture was then removed, and the paint layer on the fixture surface was tested using a coating adhesion tester. The test result was Grade 1B, which corresponds to ISO Grade 4 = ASTM Grade 1B. Some squares were partially or completely peeled off, with a peeling area greater than 35% and less than 65%.

[0041] In the above embodiments, the operator can remove 75%-85% of the paint layer on the surface of the fixture using auxiliary tools.

[0042] Example 6 differs from Example 1 in that the ultraviolet light irradiation time on the outer surface paint layer of the fixture is 8 minutes. The paint layer on the fixture surface is tested using a coating adhesion tester, and the test result is also 0B grade. This corresponds to ISO grade 5 = ASTM grade 0B, meaning the paint peeling area is greater than 65%.

[0043] In the above embodiments, the operator can remove more than 95% of the paint layer on the surface of the fixture using auxiliary tools.

[0044] In Example 7, the fixture was placed in a sealed space. The distance from the ultraviolet light source to the fixture surface was adjusted to 260 mm, and the ultraviolet irradiation angle was adjusted to 125°, ensuring that the ultraviolet light could fully act on the paint layer on the outer surface of the fixture. The circuit control module was adjusted to make the ultraviolet light source emit ultraviolet light with a wavelength of 370-380 nm. The ultraviolet light irradiated the paint layer on the outer surface of the fixture for 6 minutes. The sprayed fixture was then removed, and the paint layer on the surface of the fixture was tested using a coating adhesion tester. The test result was Grade 1B. That is, it belongs to ISO Grade 4 = ASTM Grade 1B, where some squares are partially or completely peeled off, and the peeling area is greater than 35% and less than 65%.

[0045] In the above embodiments, the operator can remove 75%-85% of the paint layer on the surface of the fixture using auxiliary tools.

[0046] Example 8 differs from Example 1 in that the ultraviolet light irradiation time on the outer surface paint layer of the fixture is 8 minutes. The paint layer on the fixture surface is tested using a coating adhesion tester, and the test result is also Grade 1B. That is, it belongs to ISO Grade 4 = ASTM Grade 1B, where some squares are partially or completely peeled off, with a peeling area greater than 35% and less than 65%.

[0047] In the above embodiments, the operator can remove 75%-85% of the paint layer on the surface of the fixture using auxiliary tools.

[0048] It should be noted that in each of the above embodiments, the paint layer thickness on the surface of the fixture is 120 μm. The methods for controlling the wavelength of the ultraviolet lamp can be as follows: 1. Replacing ultraviolet lamps with different wavelengths: Different types of ultraviolet lamps can emit ultraviolet light of different wavelengths; by replacing lamps with different wavelengths, the wavelength can be controlled.

[0049] 2. Adjusting the circuit control module: By adjusting the parameters and electronic components in the circuit control module, the operating voltage and current of the ultraviolet lamp can be changed, thereby affecting its emitted wavelength.

[0050] 3. Using optical devices such as filters: Installing suitable filters, color filters, or other optical devices in front of the ultraviolet lamp can filter out unwanted wavelengths, thereby achieving wavelength control. All three methods described above are existing technologies to those skilled in the art.

[0051] This invention uses a combination of two methods to adjust the wavelength of ultraviolet light: replacing ultraviolet lamps with different wavelengths and adjusting the circuit control module.

[0052] Please see Figure 2-5 As shown, the present invention also provides a device for embrittlement of the paint layer on the surface of a spraying fixture. It includes a hollow chamber 01 and a circulation system 02 for circulating air within the chamber 01. A hook 03 for suspending the spraying fixture is provided in the middle of the chamber 01. Support frames 04 are symmetrically and vertically mounted on both sides of the hook 03. UV lamp boxes 05 are positioned opposite each other on the two support frames 04. Ultraviolet light emitted from the UV lamps inside the UV lamp boxes 05 irradiates the spraying fixture on the hook 03. The ultraviolet light emitted from the UV lamp boxes 05 irradiates the paint layer on the outer surface of the spraying fixture, causing the paint layer to become embrittled and altering the adhesion between the paint layer and the fixture surface, thus facilitating the user to quickly remove the paint layer with the aid of auxiliary tools.

[0053] Please see Figure 2-3 As shown, the support frame 04 includes a support rod 06 vertically installed inside the housing 01. The support rod 06 is located on one side of the hook 03 and adjacent to the side wall of the housing 01. A connecting rod 07 is horizontally connected to the support rod 06 via a connector 08. An adjustable adjusting rod 09 is provided on the connecting rod 07 via the connector 08. The UV lamp box 05 is fixedly installed at the end of the adjusting rod 09. The distance between the two UV lamp boxes 05 is adjusted by setting the adjusting rod 09 at different positions on the connecting rod 07.

[0054] Please see Figure 4 As shown, the adjusting rod 09 is provided with a scale bar 10. By observing the position of the connecting rod 07 on the scale bar 10, the distances from the two UV lamp boxes 05 to the spraying fixture surface on the hook 03 are equal.

[0055] A connecting part 11 is integrally formed on the end of the adjusting rod 09. A connecting seat 12 is rotatably mounted on the connecting part 11 via a shaft and holes. The UV lamp box 05 is fixedly mounted on the connecting seat 12. The connecting part 11 has a through hole in the radial direction. The connecting seat 12 has several circularly distributed through holes 13 that are adapted to the insertion hole. A pin is inserted into the through hole and through hole 13. After removing the pin from the through hole and through hole 13 and rotating the connecting seat 12 to the set position, the pin is reinserted into the through hole and through hole 13 to restrict the rotation of the connecting seat 12 on the connecting part 11. This achieves the adjustment of the angle of the UV lamp box 05.

[0056] Please see Figure 5 As shown, the connector 08 includes a main body and quick clamps 14 integrally formed at both ends of the main body. A pressure plate 15 is rotatably mounted on one end of the quick clamp 14 via a shaft and a hole, and a locking rod 16 is rotatably mounted on the other end of the quick clamp 14 via a shaft and a hole. One end of the pressure plate 15 is provided with a slot that matches the locking rod 16. Both the quick clamp 14 and the pressure plate 15 are provided with arc-shaped receiving grooves 17. A nut 18 is threaded onto the locking rod 16, and the nut 18 abuts against the pressure plate 15. In use, the connecting rod 07 is placed in the receiving grooves 17 on the pressure plate 15 and the quick clamp 14, and the connecting rod 07 is fixed between the pressure plate 15 and the quick clamp 14 by the cooperation of the nut 18 and the locking rod 16.

[0057] Please see Figure 2 As shown, the circulation system 02 includes return air ducts 19 installed on both sides of the chamber 01 and supply air ducts 20 installed on the top of the chamber 01. One end of the supply air duct 20 is connected to the chamber 01, and the other end is connected to a circulating fan 22. One end of the return air duct 19 is connected to the chamber 01, and the other end is connected to an air processor 21. The air outlet of the air processor 21 is connected to the air inlet of the circulating fan 22. Since the chamber 01 is in a sealed state, when the UV lamp box 05 is working, the harmful gases generated are drawn into the air processor 21 through the return air duct 19 by the circulating fan 22 for treatment, and then the treated air is returned to the chamber 01 through the air inlet duct. Because the surface temperature of the fixture can reach 180-200℃ when the UV lamp box 05 is working, this temperature is below the ignition point of the paint layer, so no polluting smoke is generated during the process. This causes the temperature inside the chamber 01 to rise. The hot air inside chamber 01 is processed by air processor 21 and then returned to chamber 01 to ensure that the temperature inside chamber 01 does not drop. Simultaneously, the air inside chamber 01 is circulated and processed by air processor 21. After UV lamp box 05 stops working, the operator enters chamber 01 to avoid inhaling harmful gases.

[0058] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for embrittlement of the paint layer on the surface of a spray-coated fixture, characterized in that, Includes the following steps: S1. Suspend the spraying fixture in a closed space; S2. Adjust the distance between the ultraviolet light source and the spraying fixture, and adjust the angle of ultraviolet irradiation; S3. Set the wavelength of ultraviolet light to 320-380nm; S4. The ultraviolet light irradiation time on the outer surface of the spraying fixture is 6-10 minutes; The apparatus for implementing the above method includes a hollow chamber and a circulation system for circulating the air inside the chamber. A hook for suspending a spraying fixture is provided in the middle of the chamber. Support frames are symmetrically and vertically installed on both sides of the hook. UV lamp boxes are arranged opposite each other on the two support frames. The ultraviolet rays emitted by the UV lamp boxes irradiate the surface of the spraying fixture on the hook. The support frame includes a support rod that is vertically installed inside the room. The support rod is located on one side of the hook and adjacent to the side wall of the room. A connecting rod is horizontally connected to the support rod through a connector. The connecting rod is equipped with an adjustable adjustment rod through the connector. The UV lamp box is fixedly installed at the end of the adjustment rod. The end of the adjusting rod is integrally formed with a connecting part, and a connecting seat is rotatably installed on the connecting part by means of a shaft and a hole. The UV lamp box is fixedly installed on the connecting seat. The connecting part is provided with a through hole in the radial direction. The connecting seat has several through holes that are evenly distributed in a circle and are adapted to the through hole. A pin is inserted in the through hole and the through hole.

2. The method for embrittlement spray coating on the surface of a fixture according to claim 1, characterized in that: The wavelength of ultraviolet light is 340-360nm.

3. The method for embrittlement spray coating on the surface of a fixture according to claim 1, characterized in that: The wavelength of ultraviolet light is 360-370nm.

4. The method for embrittlement spray coating on the surface of a fixture according to claim 1, characterized in that: The ultraviolet radiation angle can be adjusted from 0 to 180°.

5. An apparatus for implementing the method of claim 1 to embrittle the surface paint layer of a spray-coated fixture, characterized in that: The connector includes a main body and quick clamps integrally formed at both ends of the main body. A pressure plate is rotatably mounted on one end of the quick clamp, and a locking rod is rotatably mounted on the other end of the quick clamp. One end of the pressure plate is provided with a slot that matches the locking rod. Both the quick clamp and the pressure plate are provided with arc-shaped receiving grooves. A nut is threaded onto the locking rod, and the nut abuts against the pressure plate.

6. The apparatus for embrittlement spraying of a fixture surface paint layer according to claim 5, characterized in that: The circulation system includes return air ducts installed on both sides of the room and supply air ducts installed on the top of the room. One end of the supply air duct is connected to the top of the room, and the other end is connected to a circulating fan. One end of the return air duct is connected to the side wall of the room, and the other end is connected to an air processor. The air outlet of the air processor is connected to the air inlet of the circulating fan.

Images