Low pressure hybrid spray system and method of spraying thereof

Abstract

The application belongs to the technical field of spraying equipment, and particularly relates to a low-pressure mixed spraying system and a spraying method thereof, which comprises a first raw material tank, a second raw material tank and a spraying head body, a stirring cavity is arranged through the spraying head body, the stirring cavity is open at the bottom, a stirring head is sleeved in the stirring cavity, an airflow cavity is arranged outside the outlet at the lower end of the stirring cavity, an output port is arranged at the bottom of the airflow cavity, the airflow cavity is connected with a gas jet pipe, the stirring cavity is connected with an air inlet pipe and a feeding pipe, the first raw material tank and the second raw material tank are connected with the feeding pipe through metering pumps, the metering pumps are electrically connected with an industrial control module, and a low-pressure mixed spraying method using the above equipment is further provided. The raw material mixed spraying system provided by the application does not need to operate under high pressure, has smaller load on the structure of the equipment, has lower requirement on air tightness maintenance, can more accurately adjust the amount of spraying raw material, and has uniform spraying effect.

Description

Technical Field

[0001] This invention relates to the field of spraying equipment technology, and more specifically, to a low-pressure mixed spraying system and spraying method thereof. Background Technology

[0002] The process of spraying an adhesive coating with functions such as beautification, corrosion protection and heat insulation onto the surface of a product is frequently used in the automotive, aviation and shipbuilding industries and is currently a popular product processing method.

[0003] AB compound is a commonly used spray protective material on the market. Also known as polyurethane black and white compound, it is a rigid adhesive layer with protective functions, composed of component A and component B. Conventional polyurethane is a high-molecular polymer produced by the copolymerization reaction of isocyanate and polyol.

[0004] Conventional AB material spraying machines on the market spray material A and material B evenly in a 1:1 ratio under a pressure greater than 1.0 MPa; or, during construction, materials A and B can be sprayed separately and quickly. To improve atomization, compressed air can also be used as the power source for spraying.

[0005] A typical AB material spraying device, as shown in patent document CN202021875866.4 entitled "A Novel Portable AB Material Mixing and Spraying Device," includes an A material cylinder, a B material cylinder, and a spray gun head. The A material cylinder and the B material cylinder are connected to the spray gun head via connecting pipes A and B, respectively. It also includes a material pump A, connected to the A material cylinder at one end via connecting pipe A and to the spray gun head at the other end; a material pump B, connected to the B material cylinder at one end via connecting pipe B and to the spray gun head at the other end; an air pump, connected to the spray gun head via a third connecting pipe; a control component, electrically connected to the material pumps A, B, and the air pump; and a cleaning agent, connected to the spray gun head via connecting pipes A and B. Throttling valves and check valves are installed on the outer walls of connecting pipes A and B. An agitator is also installed inside the spray gun head.

[0006] However, the above solution places a heavy load on the equipment structure due to the high pressure in the pipeline, making material leakage easy and maintenance inconvenient. In addition, when material A and material B are sprayed out at high speed from the spray gun head, it is difficult to confirm whether material A and material B can be fully mixed in the correct proportion, and the consistency of the spraying effect cannot be guaranteed.

[0007] In view of this, in order to improve the mixing accuracy and working stability of the spraying process, and thus improve the spraying quality, it is necessary to improve and develop the spraying system for mixing AB materials. Summary of the Invention

[0008] To address the problems of conventional AB material spraying equipment requiring high pressure, placing a heavy load on the equipment structure, being prone to material leakage, being inconvenient to maintain, and having difficulty in ensuring operational stability, resulting in uneven coating coverage and inconsistent spraying quality on object surfaces, a low-pressure hybrid spraying system and its spraying method are provided.

[0009] A low-pressure mixing spraying system includes a first raw material tank, a second raw material tank, and a spray head body. A stirring chamber is provided through the spray head body. The bottom of the stirring chamber is open. A stirring head is sleeved in the stirring chamber. An airflow chamber is provided outside the outlet at the lower end of the stirring chamber. An output port is provided at the bottom of the airflow chamber. The airflow chamber is connected to a jet pipe. The stirring chamber is connected to an air inlet pipe and a feed pipe. The first raw material tank and the second raw material tank are both connected to the feed pipe through a metering pump. The metering pump is electrically connected to an industrial control module.

[0010] Furthermore, a needle valve is provided at the input end of the feed tube, and the needle valve is electrically connected to the industrial control module.

[0011] Furthermore, both the first raw material tank and the second raw material tank are connected to circulation pipelines. The two ends of the metering pump are connected to the circulation pipelines. The needle valve is a three-way directional valve. The output end of the metering pump is connected to the input end of the three-way directional valve. One output end of the three-way directional valve is connected to the circulation pipeline, and the other output end is connected to the feed pipe.

[0012] Furthermore, the first raw material tank and the second raw material tank are each connected to a needle valve, and a linkage arm is connected between the piston ends of the two needle valves.

[0013] Furthermore, the air intake pipe is connected to an air supply module, the jet pipe is connected to an jet module, and the output end of the stirring motor is coaxially connected to the top of the stirring head. The air supply module, the jet module, and the stirring motor are all electrically connected to the industrial control module.

[0014] Furthermore, the air inlet pipe is connected to the top of the mixing chamber, and the feed pipe is connected to the side of the mixing chamber. The air inlet pipe, the feed pipe, and the nozzle body are integrally formed.

[0015] Furthermore, filters are detachably connected to the pipelines between the first raw material tank, the second raw material tank, and the metering pump.

[0016] Furthermore, a threaded seat is coaxially provided on the lower side of the nozzle body corresponding to the stirring chamber, and an air sleeve is threadedly connected to the lower part of the threaded seat. The outer side of the nozzle body and the inner side of the air sleeve form an airflow chamber, and an outlet is provided at the bottom of the air sleeve.

[0017] A low-pressure hybrid spraying method includes the following steps: Store the corresponding raw materials into the first raw material tank and the second raw material tank respectively; Move the output end of the nozzle body that connects the first raw material tank and the second raw material tank to the object to be sprayed; The operating path of the nozzle body is determined based on the shape and surface area of ​​the object to be sprayed; Turn on the metering pump to output the raw materials from the first and second raw material tanks into the inner cavity of the nozzle body; Stirring and mixing the raw materials inside the nozzle's internal cavity; Air is sprayed into the inner cavity of the nozzle body and downwards and outwards from the output end of the nozzle body to spray the mixture of raw materials from the first and second raw material tanks onto the surface of the object. Move the nozzle body according to the operating path; After the nozzle body moves to the end of the running path, the metering pump stops, the mixing stops, and the jetting stops. Output the coated object and let it air dry.

[0018] Furthermore, the raw materials in the first raw material tank and the second raw material tank are circulated into and out of the first raw material tank and the second raw material tank respectively through the circulation pipeline connected to the metering pump. The output end of the metering pump is connected to the circulation pipeline and the nozzle body through a three-way reversing valve. The output end of the three-way reversing valve is connected to the circulation pipeline in the standby state and connected to the nozzle body in the working state. The speed of the metering pump is set according to the amount of raw material to be sprayed, and the opening time of the three-way directional valve is set according to the travel time of the running path.

[0019] The advantages of this invention are: 1. By using internal and external air blowing combined with stirring to replace the pressurized conveying of AB materials, the mixing and conveying process of AB materials is improved, which is conducive to more precise and stable adjustment of the spraying process of the mixture and improves the spraying quality.

[0020] 2. It operates in a low-pressure environment close to atmospheric pressure, which places less load on the equipment structure, lowers the requirements for the airtightness of the raw material pipeline, and facilitates maintenance.

[0021] 3. It can control the output of the coating material more precisely, resulting in a good coating effect.

[0022] 4. High degree of automation: Automated spraying production can be achieved by setting the speed and running time of the metering pump and the movement path of the spray head body. Attached Figure Description

[0023] 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.

[0024] Figure 1 A schematic diagram of the piping structure of a low-pressure mixed spraying system; Figure 2 This is a structural diagram of the nozzle body; Figure 3 Exploded structural diagram of the nozzle body Figure 4 This is a bottom view of the nozzle body. Figure 5 This is a cross-sectional view of the stirring chamber.

[0025] Attached image labels: 1. First raw material tank; 2. Second raw material tank; 3. Nozzle body; 301. Mixing chamber; 302. Air inlet pipe; 303. Feed pipe; 304. Threaded seat; 4. Mixing head; 401. Mixing motor; 5. Airflow chamber; 501. Output port; 502. Jet pipe; 6. Metering pump; 7. Industrial control module; 8. Needle valve; 801. Linkage arm; 9. Circulation pipeline; 10. Filter; 11. Air sleeve. Detailed Implementation

[0026] To address the problems of conventional AB material spraying equipment requiring high pressure, placing a heavy load on the equipment structure, being prone to material leakage, being inconvenient to maintain, and having difficulty in ensuring operational stability, resulting in uneven coating coverage and inconsistent spraying quality on object surfaces, a low-pressure hybrid spraying system and its spraying method are provided.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that the terms such as “inner,” “middle,” and “one” used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as part of the scope of the invention, and this is hereby stated.

[0029] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0030] like Figures 1 to 5 As shown, this embodiment provides a low-pressure mixing spraying system, including a first raw material tank 1, a second raw material tank 2, and a spray head body 3. A stirring chamber 301 is provided through the spray head body 3. The bottom of the stirring chamber 301 is open. A stirring head 4 is sleeved in the stirring chamber 301. An airflow chamber 5 is provided outside the outlet at the lower end of the stirring chamber 301. An outlet 501 is provided at the bottom of the airflow chamber 5. The airflow chamber 5 is connected to a jet pipe 502. The stirring chamber 301 is connected to an air inlet pipe 302 and a feed pipe 303. The first raw material tank 1 and the second raw material tank 2 are both connected to the feed pipe 303 through a metering pump 6. The metering pump 6 is electrically connected to an industrial control module 7.

[0031] Among them, the industrial control module 7 can use a commercially available industrial control PLC to set the speed and start-up time of the metering pump 6, thereby accurately controlling the output of raw materials.

[0032] By using the air intake pipe 302 and the jet pipe 502 to input airflow and combine it with stirring and mixing to drive the mixing and downward pouring of raw materials, the spraying process can operate under low-pressure conditions close to atmospheric pressure, effectively reducing the airtightness requirements and maintenance costs of the equipment.

[0033] In addition, the airflow from the air inlet pipe 302 into the mixing chamber 301 can promote the mixing and output of raw materials, making the raw materials more uniformly mixed, and significantly reducing the chance of raw materials remaining inside the mixing chamber 301 causing obstruction and blockage, and can operate stably for a long time.

[0034] A needle valve 8 is provided at the input end of the feed pipe 303, and the needle valve 8 is electrically connected to the industrial control module 7. The industrial control module 7 also controls the opening and closing of the needle valve 8 to cooperate with the operation of the metering pump 6, so as to make the amount of raw material output into the mixing chamber 301 more accurate and ensure that the mixed raw material is evenly sprayed on the surface of the object.

[0035] The first raw material tank 1 and the second raw material tank 2 are each connected to a circulation pipeline 9. The two ends of the metering pump 6 are connected to the circulation pipeline 9. The needle valve 8 is a three-way reversing valve. The output end of the metering pump 6 is connected to the input end of the three-way reversing valve. One output end of the three-way reversing valve is connected to the circulation pipeline 9, and the other output end is connected to the feed pipe 303.

[0036] Since the raw material still flowing in the pipeline when the valve is closed will definitely increase the pressure in the pipeline and generate a high-pressure load on the equipment structure, and if the valve is not designed, it is difficult to achieve precise control of the raw material output by simply stopping the metering pump 6, and the raw material is easy to remain in the pipeline, causing agglomeration or even blockage. Therefore, in order to solve the above contradictions, achieve low-pressure continuous operation of mixing spraying, and avoid the raw material from sticking in the conveying pipeline, a circulation pipeline 9 is set up to cooperate with the continuous operation of the metering pump 6 to make the raw material continuously circulate. The amount of raw material input into the mixing chamber 301 is accurately controlled by setting the opening time of the reversing valve.

[0037] In addition, a robotic arm can be used to move the spray head body 3, thereby automatically spraying the entire surface of the object and realizing fully automated spraying production.

[0038] The first raw material tank 1 and the second raw material tank 2 are each connected to a needle valve 8, and a linkage arm 801 is connected between the piston ends of the two needle valves 8. Since the conventional mixing ratio of A and B materials is one to one, the valves with synchronous switching can further ensure the accuracy of the output ratio of A and B materials.

[0039] The air inlet pipe 302 is connected to an air supply module (not shown in the figure), and the jet pipe 502 is connected to an jet module (not shown in the figure). The output terminal of the stirring motor 401 is coaxially connected to the top of the stirring head 4. The air supply module, jet module, and stirring motor 401 are all electrically connected to the industrial control module 7. The air supply module, jet module, and stirring motor 401 are all controlled by the industrial control module 7, which can prevent air blowing and stirring after spraying stops, prevent the mixed layer sprayed on the object surface from being blown away by the airflow, and prevent the stirring head 4 from running idle and causing unnecessary wear.

[0040] The air inlet pipe 302 connects to the top of the mixing chamber 301, and the feed pipe 303 connects to the side of the mixing chamber 301. The air inlet pipe 302 and the feed pipe 303 are integrally formed with the nozzle body 3. The air inlet pipe 302 and the feed pipe 303, which are integrally formed on the nozzle body 3, have strong airtightness and short paths, which can avoid material leakage between pipes and reduce material adhesion in the pipes, thereby improving the accuracy of material output.

[0041] A filter 10 is detachably connected to the pipeline between the first raw material tank 1, the second raw material tank 2, and the metering pump 6. The filter 10 can effectively filter out impurities in materials A and B, ensuring uniformity of raw materials. The detachable design facilitates timely removal of the filter 10 for cleaning and maintenance.

[0042] A threaded seat 304 is coaxially arranged on the lower side of the nozzle body 3, corresponding to the stirring chamber 301. An air sleeve 11 is threadedly connected to the lower part of the threaded seat 304. The outer side of the nozzle body 3 and the inner side of the air sleeve 11 enclose each other to form an airflow chamber 5. An outlet 501 is provided at the bottom of the air sleeve 11. The detachable air sleeve 11 facilitates the formation of an airflow chamber 5 below the nozzle body 3 that restricts downward airflow, and also facilitates the disassembly of equipment parts for maintenance and cleaning of the internal structure.

[0043] A low-pressure hybrid spraying method includes the following steps: Store the corresponding raw materials into the first raw material tank 1 and the second raw material tank 2 respectively; The raw materials in the first raw material tank 1 and the second raw material tank 2 are circulated into and out of the first raw material tank 1 and the second raw material tank 2 through the circulation pipeline 9 connected to the metering pump 6. The output end of the metering pump 6 is connected to the circulation pipeline 9 and the nozzle body 3 through the three-way reversing valve (i.e., needle valve 8). The output end of the three-way reversing valve is connected to the circulation pipeline 9 in the standby state and connected to the nozzle body 3 in the working state. Move the output end of the nozzle body 3, which connects the first raw material tank 1 and the second raw material tank 2, above the object to be sprayed; The rotation speed of the metering pump 6 is set according to the amount of raw material to be sprayed, the running path of the nozzle body 3 is determined according to the shape and surface area of ​​the object to be sprayed, and the opening time of the three-way reversing valve is set according to the movement time of the running path.

[0044] Turn on the metering pump 6 and open the three-way reversing valve to the working state to output the raw materials in the first raw material tank 1 and the second raw material tank 2 into the inner cavity of the nozzle body 3; Stirring and mixing the raw materials inside the nozzle body 3; Spray air into the inner cavity of the nozzle body 3 and spray air downwards and outwards from the output end of the nozzle body 3 to spray the mixture of raw materials in the first raw material tank 1 and the second raw material tank 2 onto the surface of the object. Move the nozzle body 3 according to the operating path; After the nozzle body 3 moves to the end of the running path, the three-way reversing valve is switched back to the standby state to stop stirring and stop jetting; Output the coated object and let it air dry.

[0045] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be construed that the specific implementation of the present invention is limited to these descriptions. All equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A low-pressure hybrid spraying system, characterized in that, The device includes a first raw material tank, a second raw material tank, and a nozzle body. A stirring chamber is provided through the nozzle body. The bottom of the stirring chamber is open. A stirring head is sleeved in the stirring chamber. An airflow chamber is provided outside the outlet at the lower end of the stirring chamber. An output port is provided at the bottom of the airflow chamber. The airflow chamber is connected to a jet pipe. The stirring chamber is connected to an air inlet pipe and a feed pipe. The first raw material tank and the second raw material tank are both connected to the feed pipe through a metering pump. The metering pump is electrically connected to an industrial control module. The air inlet pipe connects to the top of the mixing chamber, and the feed pipe connects to the side of the mixing chamber. The air inlet pipe, feed pipe, and nozzle body are integrally formed. A threaded seat is coaxially provided on the lower side of the nozzle body corresponding to the mixing chamber. A sleeve is threadedly connected to the lower part of the threaded seat. The outer side of the nozzle body and the inner side of the sleeve form an airflow chamber. An outlet is provided at the bottom of the sleeve.

2. The low-pressure hybrid spraying system according to claim 1, characterized in that, A needle valve is provided at the input end of the feed tube, and the needle valve is electrically connected to the industrial control module.

3. The low-pressure hybrid spraying system according to claim 2, characterized in that, Both the first raw material tank and the second raw material tank are connected to circulation pipelines. The two ends of the metering pump are connected to the circulation pipelines. The needle valve is a three-way directional valve. The output end of the metering pump is connected to the input end of the three-way directional valve. One output end of the three-way directional valve is connected to the circulation pipeline, and the other output end is connected to the feed pipe.

4. The low-pressure hybrid spraying system according to claim 2 or 3, characterized in that, The first raw material tank and the second raw material tank are each connected to a needle valve, and a linkage arm is connected between the piston ends of the two needle valves.

5. The low-pressure hybrid spraying system according to claim 1, characterized in that, The air intake pipe is connected to an air supply module, the jet pipe is connected to a jet module, and the output terminal of the stirring motor is coaxially connected to the top of the stirring head. The air supply module, the jet module, and the stirring motor are all electrically connected to the industrial control module.

6. The low-pressure hybrid spraying system according to claim 1, characterized in that, Filters are detachably connected to the pipelines between the first raw material tank, the second raw material tank, and the metering pump.

7. A low-pressure mixed spraying method, characterized in that, Includes the following steps: Store the corresponding raw materials into the first raw material tank and the second raw material tank respectively; Move the output end of the nozzle body that connects the first raw material tank and the second raw material tank to the object to be sprayed; The operating path of the nozzle body is determined based on the shape and surface area of ​​the object to be sprayed; Turn on the metering pump to output the raw materials from the first and second raw material tanks into the inner cavity of the nozzle body; Stirring and mixing the raw materials inside the nozzle's internal cavity; Air is sprayed into the inner cavity of the nozzle body and downwards and outwards from the output end of the nozzle body to spray the mixture of raw materials from the first and second raw material tanks onto the surface of the object. Move the nozzle body according to the operating path; After the nozzle body moves to the end of the running path, the metering pump stops, the mixing stops, and the jetting stops. Output the coated object and let it air dry.

8. The low-pressure mixed spraying method according to claim 7, characterized in that, The raw materials in the first raw material tank and the second raw material tank are circulated into and out of the first raw material tank and the second raw material tank respectively through the circulation pipeline connected to the metering pump. The output end of the metering pump is connected to the circulation pipeline and the nozzle body through a three-way reversing valve. The output end of the three-way reversing valve is connected to the circulation pipeline in the standby state and connected to the nozzle body in the working state. The speed of the metering pump is set according to the amount of raw material to be sprayed, and the opening time of the three-way directional valve is set according to the travel time of the running path.

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