A self-cleaning spray device and a nozzle self-cleaning method

Abstract

The present application relates to a kind of self-cleaning spraying device and nozzle self-cleaning method, belong to spraying device technical field, including: gas pipe interface, coating interface and nozzle shell, electromagnetic valve A is connected between gas pipe interface and nozzle shell, electromagnetic valve B is connected between coating interface and nozzle shell, nozzle is set up in the side of nozzle shell deviating from coating interface, floating head is slidably arranged in the inside of nozzle shell;Support is coaxially connected to the inside of nozzle shell, support is slidably connected with floating head, support limits floating head to avoid the clearance between the inclined section of floating head and the inclined section of nozzle shell disappears;It can solve the technical problem of internal blockage caused by pigment and filler settlement and caking into nozzle in prior art.

Description

Technical Field

[0001] This invention belongs to the field of spraying equipment technology, and specifically relates to a self-cleaning spraying device and a nozzle self-cleaning method. Background Technology

[0002] When producing wine bottles, water-based coatings are used to beautify the bottle body. This is done using a spraying device. However, even if the pigments and fillers in the water-based coatings are evenly dispersed, slight sedimentation and agglomeration are inevitable during mass production due to settling. These sedimentation and agglomeration can cause blockages when they enter the nozzles with the coating. Therefore, how to clean the spraying device is a problem that those skilled in the art need to solve.

[0003] A patent with publication number CN111822198A discloses a self-cleaning environmentally friendly spraying device, including a pipe with a nozzle at the end of the pipe and a power output mechanism inside the pipe. The extended end of the power output mechanism has a drive wheel. A reciprocating telescopic mechanism is installed on one side of the outer wall of the nozzle. A scraper is installed at the end of the reciprocating telescopic mechanism facing the nozzle, and a driven wheel is installed at the end of the reciprocating telescopic mechanism away from the scraper. A transmission belt rotatably connects the drive wheel and the driven wheel. A tensioning mechanism is also provided between the drive wheel and the driven wheel.

[0004] The existing technology has the following problems:

[0005] The self-cleaning spatula is located on the outer wall of the nozzle, which makes it difficult to solve the internal blockage caused by pigment and filler settling and agglomerating into the nozzle. Summary of the Invention

[0006] This invention provides a self-cleaning spraying device and a nozzle self-cleaning method, which can solve the technical problem of internal blockage caused by pigments and fillers settling and agglomerating into the nozzle in the prior art.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] This application provides a self-cleaning spraying device, comprising an air pipe interface, a paint interface, and a nozzle housing. A solenoid valve A is connected between the air pipe interface and the nozzle housing, and a solenoid valve B is connected between the paint interface and the nozzle housing. A nozzle is provided on the side of the nozzle housing opposite to the paint interface. The device further includes:

[0009] A floating head is slidably disposed inside the nozzle housing. When the air pipe interface and / or the paint interface pressurize and inject gas and / or paint into the nozzle housing, the floating head slides towards the nozzle, and the gap between the inclined section of the floating head and the inclined section of the nozzle housing decreases. When the air pipe interface and / or the paint interface stop pressurizing and injecting gas and / or paint into the nozzle housing, the gap between the inclined section of the floating head and the inclined section of the nozzle housing increases.

[0010] A bracket is coaxially connected to the inner side of the nozzle housing. The bracket is slidably connected to the floating head. The bracket limits the floating head to prevent the gap between the inclined section of the floating head and the inclined section of the nozzle housing from disappearing.

[0011] By employing the above technical solution, a sliding floating head is used inside the nozzle housing to adjust the position of the injection nozzle by changing the channel gap, thereby preventing the deposited crystals from remaining in the same position and gradually increasing in size. This achieves self-cleaning inside the spraying device and avoids nozzle clogging.

[0012] In this invention, the inner side of the nozzle housing is coated with a zirconia ceramic coating A, and the outer side of the floating head is coated with a zirconia ceramic coating B.

[0013] The above technical solution uses a zirconia ceramic coating to increase the surface hardness of the nozzle's internal structure, avoiding scratches from high-hardness pigments and fillers that aggravate pigment and filler deposition, and further improving the self-cleaning performance of the spraying device.

[0014] In this invention, a spring is abutting between the floating head and the bracket, and the spring pushes the floating head away from the nozzle.

[0015] The above technical solution uses a spring to reset the floating head, which reduces structural complexity and avoids external contamination.

[0016] In this invention, the straight segment on the outer side of the floating head has multiple spiral grooves.

[0017] The aforementioned bracket is slidably connected to a sliding seat, and a bearing is connected between the sliding seat and the floating head. When the gas and / or coating is pressurized and passes through the spiral groove, the floating head rotates around the bracket.

[0018] The above technical solution, using a spiral groove and bearing structure, enables the floating head to rotate when pressurized air and / or paint is introduced. The self-rotation of the floating head grinds and crushes the deposited crystals, avoiding the formation of large crystals and improving the self-cleaning performance of the spraying device.

[0019] This application provides a nozzle self-cleaning method based on the above-mentioned self-cleaning spraying device, comprising the following steps:

[0020] Step S10: Compressed air is introduced through the air pipe interface, and paint is introduced under positive pressure through the paint interface. By pressurizing, the floating head is pushed to slide towards the nozzle. The gap between the inclined section of the floating head and the inclined section of the nozzle shell is reduced, so that the deposited crystals are deposited at the corner of the straight section and the inclined section of the nozzle shell.

[0021] Step S20: During the spraying gap, the paint interface is closed by the solenoid valve B. When the pressure decreases, the floating head moves away from the nozzle under the drive of the spring. The gap between the inclined section of the floating head and the inclined section of the nozzle housing increases. The deposited crystals loosen and move along the inclined section of the nozzle housing to the connection between the bracket and the nozzle housing under the blowing of compressed air.

[0022] Step S30: Paint is reintroduced into the paint inlet, and the floating head impacts the nozzle to break up the deposited crystals;

[0023] Step S40: The broken deposited crystals are sprayed out with the initially introduced compressed air and coating, rinsing the nozzle.

[0024] The above technical solution uses the displacement of the floating head to achieve the displacement of the deposited crystals, and the displacement breaks up the deposited crystals. Then, the deposited crystals from the broken displacement are used to flush the nozzle, thereby achieving self-cleaning of the nozzle.

[0025] In this invention, step S30 further includes:

[0026] Compressed air and coating are pressurized and pass through the spiral grooves, driving the floating head to rotate. The rotating floating head grinds the deposited crystals.

[0027] The above technical solution uses a rotating floating head to deposit crystals for grinding, which further refines the deposited crystals, reduces wear on the nozzle, and improves the rinsing effect. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 An isometric view of a self-cleaning spraying device provided in an embodiment of the present invention;

[0030] Figure 2This is a front view of a self-cleaning spraying device provided in an embodiment of the present invention;

[0031] Figure 3 for Figure 2 The cross-sectional view at point AA is a schematic diagram showing the pressurization of air and / or paint during the introduction of the coating.

[0032] Figure 4 for Figure 2 The cross-sectional view at point AA is a schematic diagram showing the condition where only air is pressurized and introduced.

[0033] Figure 5 for Figure 3 A magnified view of point B in the image;

[0034] Figure 6 This is a side view of a self-cleaning spraying device provided in an embodiment of the present invention;

[0035] Figure 7 for Figure 6 Sectional view at point CC.

[0036] Icons: 101-Nozzle housing; 102-Air pipe interface; 103-Coating interface; 104-Solenoid valve A; 105-Solenoid valve B; 106-Nozzle; 107-Mixing chamber; 108-Sliding area; 109-Zirconium oxide ceramic coating A; 201-Floating head; 202-Bracket; 203-Spring; 204-Sliding seat; 205-Bearing; 206-Helical groove; 207-Zirconium oxide ceramic coating B. Detailed Implementation

[0037] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0038] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 application 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 application.

[0039] In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to welding, bolting, or riveting; they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] Example:

[0042] Please refer to Figures 1 to 7 , Figures 1 to 7 The image shown is an embodiment of this application.

[0043] This embodiment provides a self-cleaning spraying device, such as... Figures 1 to 4 As shown, the device includes an air pipe interface 102, a paint interface 103, and a nozzle housing 101. A solenoid valve A104 is connected between the air pipe interface 102 and the nozzle housing 101, and a solenoid valve B105 is connected between the paint interface 103 and the nozzle housing 101. A nozzle 106 is provided on the side of the nozzle housing 101 opposite to the paint interface 103. The device also includes:

[0044] The floating head 201 is slidably disposed inside the nozzle housing 101. When the gas pipe interface 102 and / or the paint interface 103 pressurizes and injects gas and / or paint into the nozzle housing 101, the floating head 201 slides towards the nozzle 106, and the gap between the inclined section of the floating head 201 and the inclined section of the nozzle housing 101 decreases. When the gas pipe interface 102 and / or the paint interface 103 stop pressurizing and injecting gas and / or paint into the nozzle housing 101, the gap between the inclined section of the floating head 201 and the inclined section of the nozzle housing 101 increases.

[0045] The bracket 202 is coaxially connected to the inner side of the nozzle housing 101. The bracket 202 is slidably connected to the floating head 201. The bracket 202 limits the floating head 201 to prevent the gap between the inclined section of the floating head 201 and the inclined section of the nozzle housing 101 from disappearing.

[0046] It should be noted that when water-based varnishes, primers, and base coats are sprayed, the core cause of clogging is the coagulation, precipitation, or residue of solid components in the coating. Even with strict operating procedures, the following four types of clogging caused by the material's inherent characteristics and minor environmental fluctuations are still difficult to completely eliminate. Essentially, they are caused by the inherent properties of the water-based system or uncontrollable minor variables.

[0047] The unavoidable causes of congestion include:

[0048] 1. Slight sedimentation of pigments and fillers / solid components: Even if the pigments and fillers (such as silica and titanium dioxide) in water-based coatings are evenly dispersed, they may still settle slightly after long-term standing (such as at the bottom of the material bucket in mass production). Strict procedures can reduce the amount of sedimentation, but cannot completely prevent it. Slight agglomerates may still cause blockages when they enter the spraying equipment with the coating.

[0049] 2. Residual paint drying at nozzle 106: During the spraying process, nozzle 106 is always exposed to the air. Even if it is sealed in time when pausing, a small amount of residual paint in the spraying device will still dry slightly due to the rapid evaporation of moisture during the moment of switching paint or short pause. This is a physical characteristic of water-based paints that use water as a solvent, and it is difficult to completely avoid.

[0050] 3. Trace precipitation of additives: The compatibility of additives (anti-scratch agents, leveling agents) with resins and solvents in water-based coatings is relatively stable, but not absolutely risk-free. Even if the formula is compliant, small fluctuations in workshop temperature and humidity (such as temperature differences between day and night, uneven air conditioning) may still trigger the precipitation of trace additives, forming ultrafine particles that clog the spraying device.

[0051] 4. Environmental and system minute impurities: Even with filtration before material addition and regular cleaning of pipelines, ultrafine dust in the air and extremely fine residues generated on the inner wall of pipelines after long-term use (such as resin film shedding) may still break through the filtration process and mix into the coating. These impurities have extremely small particle sizes and are difficult to intercept 100%. When they accumulate to a certain extent, they will clog the spraying device.

[0052] The third and fourth reasons mentioned above are not the crystallization reasons addressed in this embodiment. The device part of this embodiment mainly addresses reason 1, and the method part mainly addresses reason 2. The air pipe interface 102 is used to connect to the air source provided by the air compressor in the factory, and the paint interface 103 is used to connect to the centralized paint supply system. Since the air compressor and the centralized paint supply system are not within the protection scope of this embodiment, they will not be described in detail or further limited here. Other structures or components that are used to ensure the basic operation of the spraying device will not be described further because they are not highly related to the technical problems solved in this embodiment and can be implemented by those skilled in the art using conventional technical solutions.

[0053] By employing the above technical solution, the sliding floating head 201 changes the channel gap within the nozzle housing 101 by adjusting the pressure of the injection nozzle 106, thereby preventing the deposition and crystallization from remaining in the same position and gradually increasing in size. This achieves self-cleaning inside the spraying device and prevents the nozzle 106 from becoming clogged.

[0054] As a preferred implementation method, such as Figure 3 and Figure 5As shown, the inner side of the nozzle housing 101 is coated with a zirconia ceramic coating A109, wherein the zirconia ceramic coating A109 is attached to the nozzle 106 and the sliding area 108, and the outer side of the floating head 201 is coated with a zirconia ceramic coating B207.

[0055] The substrate of the spraying device is made of 304 stainless steel, which is easy to process and has a low cost. The zirconia ceramic coating is applied by plasma spraying. Because of the impact crushing and rotation grinding of the floating head 201, a zirconia ceramic coating with higher hardness is required to avoid the pigments and fillers from scratching the internal structure and aggravating the deposition and crystallization. The plasma spraying process used here is a publicly available technology, so it will not be specifically limited or explained here. Those skilled in the art can outsource the processing or directly customize it through public channels.

[0056] The above technical solution uses a zirconia ceramic coating to increase the surface hardness of the internal structure of nozzle 106, which avoids the high hardness pigments and fillers from scratching and aggravating the deposition of pigments and fillers, and further improves the self-cleaning performance of the spraying device.

[0057] As a preferred implementation method, such as Figure 3 and Figure 4 As shown, a spring 203 abuts against the floating head 201 and the bracket 202, and the spring 203 pushes the floating head 201 away from the nozzle 106.

[0058] It should be noted that the spring 203 is a low-cost and easy-to-replace reset structure. However, since wine bottle spraying requires frequent intermittent spraying, a miniature hydraulic spring or a miniature pneumatic spring can also be used if necessary.

[0059] The above technical solution uses a spring 203 to reset the floating head 201, which reduces the structural complexity and avoids external contamination.

[0060] As a preferred implementation method, such as Figure 3 and Figure 4 As shown, the outer straight section of the aforementioned floating head 201 has multiple spiral grooves 206.

[0061] The aforementioned bracket 202 is slidably connected to a sliding seat 204, and a bearing 205 is connected between the sliding seat 204 and the floating head 201. When gas and / or coating are pressurized and pass through the spiral groove 206, the floating head 201 rotates around the bracket 202.

[0062] Through the above technical solution, the structure of the spiral groove 206 and the bearing 205 enables the floating head 201 to rotate when air and / or paint are pressurized. The self-rotation of the floating head 201 grinds and crushes the deposited crystals, avoids the formation of large crystals, and improves the self-cleaning performance of the spraying device.

[0063] This embodiment also provides a nozzle self-cleaning method, which is based on the above-mentioned self-cleaning spraying device and includes the following steps:

[0064] like Figure 3 As shown, in step S10: Compressed air is introduced through the air pipe interface 102, and paint is introduced under positive pressure through the paint interface 103. The compressed air and paint are mixed in the mixing chamber 107. By pressurizing, the floating head 201 is pushed to slide towards the nozzle 106. The gap between the inclined section of the floating head 201 and the inclined section of the nozzle housing 101 is reduced, so that the deposited crystals are deposited at the corner between the straight section and the inclined section of the nozzle housing 101.

[0065] like Figure 4 As shown, in step S20: During the spraying gap, the paint interface 103 is closed by the solenoid valve B105. When the pressure decreases, the floating head 201 moves away from the nozzle 106 under the drive of the spring 203, and the gap between the inclined section of the floating head 201 and the inclined section of the nozzle housing 101 increases, as shown... Figure 6 and Figure 7 As shown, the deposited crystals loosen and move along the inclined section of the nozzle housing 101 under the blowing of compressed air to the connection between the support 202 and the nozzle housing 101. Nozzle housing 101 The gap at the connection is smaller than that of nozzle 106, which means that the deposited crystals that can pass through the gap can also pass through nozzle 106.

[0066] Step S30: Paint is reintroduced into the paint inlet 103, and the floating head 201 impacts the nozzle 106 to break up the deposited crystals;

[0067] Step S40: The broken deposited crystals are sprayed out with the initially introduced compressed air and paint, rinsing the nozzle 106.

[0068] It should be noted that the zirconia ceramic coating A109 needs to cover the inner wall of the nozzle 106.

[0069] Through the above technical solution, the displacement of the floating head 201 is used to realize the displacement of the deposited crystal, and the displacement is used to break the deposited crystal, thereby using the deposited crystal of the broken displacement to flush the nozzle 106, so as to realize the self-cleaning of the nozzle 106.

[0070] In a preferred embodiment, step S30 further includes:

[0071] Compressed air and coating are pressurized and pass through the spiral groove 206, driving the floating head 201 to rotate. The rotating floating head 201 grinds the deposited crystals.

[0072] The above technical solution uses a rotating floating head 201 to deposit crystals for grinding, further refining the deposited crystals, reducing wear on the nozzle 106, and improving the rinsing effect.

[0073] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A self-cleaning spraying device, comprising an air pipe interface (102), a paint interface (103), and a nozzle housing (101), wherein a solenoid valve A (104) is connected between the air pipe interface (102) and the nozzle housing (101), a solenoid valve B (105) is connected between the paint interface (103) and the nozzle housing (101), and a nozzle (106) is provided on the side of the nozzle housing (101) opposite to the paint interface (103), characterized in that, Also includes: A floating head (201) is slidably disposed inside the nozzle housing (101). When the air pipe interface (102) and / or the paint interface (103) pressurize and inject gas and / or paint into the nozzle housing (101), the floating head (201) slides toward the nozzle (106), and the gap between the inclined section of the floating head (201) and the inclined section of the nozzle housing (101) decreases. When the air pipe interface (102) and / or the paint interface (103) stop pressurizing and injecting gas and / or paint into the nozzle housing (101), the gap between the inclined section of the floating head (201) and the inclined section of the nozzle housing (101) increases. A bracket (202) is coaxially connected to the inner side of the nozzle housing (101). The bracket (202) is slidably connected to the floating head (201). The bracket (202) limits the floating head (201) to prevent the gap between the inclined section of the floating head (201) and the inclined section of the nozzle housing (101) from disappearing. The gap at the connection between the bracket (202) and the nozzle housing (101) is smaller than that of the nozzle (106). The displacement of the floating head (201) realizes the displacement of the deposited crystals. The displacement of the floating head (201) breaks the deposited crystals. The broken deposited crystals are discharged through the nozzle (106) after passing through the gap at the connection between the bracket (202) and the nozzle housing (101).

2. The self-cleaning spraying device according to claim 1, characterized in that, The inner side of the nozzle housing (101) is coated with a zirconia ceramic coating A (109), and the outer side of the floating head (201) is coated with a zirconia ceramic coating B (207).

3. The self-cleaning spraying device according to claim 2, characterized in that, A spring (203) abuts against the floating head (201) and the bracket (202), and the spring (203) pushes the floating head (201) away from the nozzle (106).

4. The self-cleaning spraying device according to claim 3, characterized in that, The outer straight section of the floating head (201) has multiple spiral grooves (206). The bracket (202) is slidably connected to a sliding seat (204), and a bearing (205) is connected between the sliding seat (204) and the floating head (201). When the gas and / or coating is pressurized through the spiral groove (206), the floating head (201) rotates around the bracket (202).

5. A nozzle self-cleaning method, characterized in that, Based on the self-cleaning spraying device as described in claim 4, the following steps are included: Step S10: Compressed air is introduced through the air pipe interface (102), and paint is introduced under positive pressure through the paint interface (103). By applying pressure, the floating head (201) is pushed to slide towards the nozzle (106). The gap between the inclined section of the floating head (201) and the inclined section of the nozzle housing (101) is reduced, so that the deposited crystals are deposited at the corner between the straight section and the inclined section of the nozzle housing (101). Step S20: During the spraying gap, the paint interface (103) is closed by the solenoid valve B (105). When the pressure decreases, the floating head (201) moves away from the nozzle (106) under the drive of the spring (203). The gap between the inclined section of the floating head (201) and the inclined section of the nozzle housing (101) increases. The deposited crystals loosen and move along the inclined section of the nozzle housing (101) to the connection between the bracket (202) and the nozzle housing (101) under the blowing of compressed air. Step S30: Paint is reintroduced into the paint inlet (103), and the floating head (201) impacts the nozzle (106) to break up the deposited crystals; Step S40: The broken deposited crystals are sprayed out with the initially introduced compressed air and paint, rinsing the nozzle (106).

6. The nozzle self-cleaning method according to claim 5, characterized in that, Step S30 further includes: Compressed air and coating are pressurized and pass through the spiral groove (206) to drive the floating head (201) to rotate, and the rotating floating head (201) grinds the deposited crystals.

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