Color changing control valve of paint spraying system

Abstract

The utility model belongs to the technical field of spraying, and particularly relates to a color changing control valve of a paint spraying system, which comprises a valve body, a valve cavity arranged at one end of the valve body, a valve seat connected with the end part of the valve body, a through hole arranged at the other end of the valve body, a piston arranged in the valve cavity, a piston rod arranged on the piston, a return spring arranged in the valve cavity and a gas transmission channel arranged in the valve body, and one end of the gas transmission channel is adjacent to one side surface of the piston provided with the piston rod, and the other end is positioned on the outer side wall of the valve body. The plug plugs a paint channel in the spraying system and is in a normally-closed state, when paint needs to be conveyed, high-pressure gas is conveyed through the gas conveying pipeline, air pressure acts on the piston, the piston moves towards the valve seat, the piston rod is driven to move, and the plug opens the paint channel. When the paint does not need to be conveyed, conveying of the high-pressure gas is stopped, the paint channel is blocked by the plug under the action of the reset spring, the color changing control valve is simple in structure and high in reaction speed, the number of parts of the color changing control valve is small, and the damage probability is reduced.

Description

Technical Field

[0001] This utility model relates to the field of spraying technology, and in particular to a color-changing control valve for a spray painting system. Background Technology

[0002] To improve the quality and utilization rate of automotive painting and reduce the harm to workers during the painting process, robotic painting is now widely used in automotive painting. During the painting process, all required colors are connected from outside the paint booth via air pipes to a color-changing control valve assembly on the painting robot. This assembly allows for the switching of the desired paint color. The color-changing control valve assembly consists of individual color-changing control valves mounted on an integrated block.

[0003] The basic unit's integrated block typically includes the integrated block itself and two color-changing control valves mounted on it. The bottom of the integrated block has two switching channels for different colors. The outer ends of these channels connect to flexible hoses supplying different colors of paint, while the inner ends connect to the central channel inside the integrated block. An air inlet channel is provided on the integrated block, and an air pipe connects to this channel via a mounting assembly. High-pressure gas from outside enters the air inlet channel through the air pipe, then passes through the air inlet located on the side of the corresponding color-changing control valve. This high-pressure gas controls the piston rod inside the valve to move up and down, thereby causing the piston head to block or open the corresponding hole in the central channel. This switches the paint colors located in the different switching channels into the central channel, and the paint entering the central channel is then directly transported through pipes to the spray gun on the robotic arm.

[0004] As people's demands for automobiles diversify, cars have also become fashionable items, leading to increasingly higher requirements for multi-color painting. Consequently, the requirements for color-changing control valves are also becoming more stringent.

[0005] The color-changing control valves currently in use are relatively small in size and highly integrated, resulting in a complex internal structure. Due to the large number of components, they are more prone to damage during use. If even one component of the color-changing control valve fails, it needs to be replaced; otherwise, color mixing will occur, directly affecting the quality of automotive products.

[0006] To address the aforementioned problems, this utility model document proposes a color-changing control valve for a paint spraying system. Utility Model Content

[0007] This invention provides a color-changing control valve for a paint spraying system, which simplifies the structure of the color-changing control valve, improves its service life, and ensures the quality of the paint spraying.

[0008] This utility model provides the following technical solution:

[0009] A color-changing control valve for a paint spraying system includes a valve body. One end of the valve body has a valve cavity, and a valve seat is fitted at that end. The other end has a through hole communicating with the valve cavity. A piston is provided inside the valve cavity. A piston rod is provided on the side of the piston away from the valve seat. One end of the piston rod passes through the through hole and has a plug. A return spring is provided inside the valve cavity. One end of the return spring abuts against the piston, and the other end abuts against the valve seat. An air supply channel communicating with the valve cavity is provided inside the valve body. One end of the air supply channel is located adjacent to the side of the piston with the piston rod, and the other end is located on the outer wall of the valve body.

[0010] Furthermore, a positioning rod is provided on the adjacent surface of the piston and the valve seat, and the return spring is sleeved on the positioning rod.

[0011] Furthermore, a clearance hole is provided on the valve seat at the position corresponding to the positioning rod, and one end of the positioning rod is slidably disposed in the clearance hole.

[0012] Furthermore, a first sealing element is fitted onto the sidewall of the through hole near both ends of the through hole.

[0013] Furthermore, the valve body sidewall is provided with a detection hole, which is connected to the through hole, and the position where the detection hole and the through hole are connected is located between the first sealing elements at both ends of the through hole.

[0014] Furthermore, the valve body is fitted with a first sealing ring on both sides of the gas transmission channel.

[0015] Furthermore, the valve body sidewall is provided with an annular air groove, and one end of the air delivery channel is located at the bottom of the annular air groove.

[0016] Furthermore, a second seal is fitted onto the sidewall of the piston.

[0017] Furthermore, the valve seat is engaged with the valve body, and the piston rod is engaged with the plug.

[0018] Furthermore, a second sealing ring is fitted onto the end face of the valve body at the end with the through hole.

[0019] In this invention, after the color-changing control valve is installed, the plug seals the paint channel in the spraying system, keeping it in a normally closed state. When paint needs to be supplied, high-pressure gas is supplied through the gas supply line. The gas pressure acts on the piston, causing it to move towards the valve seat, which in turn moves the piston rod, opening the paint channel with the plug. When paint supply is no longer needed, stopping the supply of high-pressure gas causes the plug to seal the paint channel again under the action of the return spring. This color-changing control valve has a simple structure, fast response speed, and few components, reducing the probability of damage. Attached Figure Description

[0020] Figure 1 A cross-sectional view of a color-changing control valve for a paint spraying system provided in an embodiment of this utility model;

[0021] Figure 2 A three-dimensional structural schematic diagram of a color-changing control valve for a paint spraying system provided in an embodiment of this utility model;

[0022] Figure 3 This is a cross-sectional view of the valve body in a color-changing control valve for a paint spraying system, as provided in an embodiment of this utility model.

[0023] Figure label:

[0024] 1. Valve body; 2. Valve seat; 3. Valve chamber; 4. Piston; 5. Piston rod; 6. Plug; 7. Through hole; 8. Annular gas groove; 9. Gas delivery channel; 10. Detection hole; 11. Return spring; 12. Positioning rod; 13. First seal; 14. Second seal ring; 15. First seal ring; 16. Second seal; 17. Relief hole. Detailed Implementation

[0025] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0026] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of this utility model, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to 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 embodiments of this utility model.

[0027] In this embodiment of the invention, the terms "first" and "second" 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. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0028] In this embodiment of the invention, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] References to "one embodiment" or "some embodiments" as used in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0030] Example:

[0031] Reference Figure 1 , Figure 2 and Figure 3 As shown, a color-changing control valve for a paint spraying system includes a valve body 1. One end of the valve body 1 has a valve cavity 3, and a valve seat 2 is fitted at that end. The other end has a through hole 7 communicating with the valve cavity 3. A piston 4 is provided inside the valve cavity 3. A piston rod 5 is provided on the side of the piston 4 away from the valve seat 2. One end of the piston rod 5 passes through the through hole 7 and has a plug 6. A return spring 11 is provided inside the valve cavity 3. One end of the return spring 11 abuts against the piston 4, and the other end abuts against the valve seat 2. An air supply channel 9 is provided inside the valve body 1 and communicates with the valve cavity 3. One end of the air supply channel 9 is located adjacent to the side of the piston 4 where the piston rod 5 is located, and the other end is located on the outer wall of the valve body 1.

[0032] The plug 6 is used to seal the paint pipe in the color-changing system. The piston rod 5 is fixed on the piston 4, and the plug 6 is installed on the piston rod 5. The movement of the piston 4 can drive the plug 6 to move, thereby controlling the opening and closing of the paint pipe. The gas supply channel 9 is connected to the external gas supply equipment. High-pressure gas is supplied through the gas supply channel 9. The high-pressure gas pushes the piston 4 towards the valve seat 2, and at the same time compresses the return spring 11. The movement of the piston 4 drives the plug 6 towards the valve body 1, so that the plug 6 leaves the paint pipe, thereby opening the paint pipe. When the paint of that color is used up, the supply of high-pressure gas stops. Under the elastic force of the return spring 11, the piston 4 returns to the initial position, thereby causing the plug 6 to seal the paint pipe.

[0033] A positioning rod 12 is provided on the adjacent surface of the piston 4 and the valve seat 2, and a return spring 11 is sleeved on the positioning rod 12.

[0034] The positioning rod 12 ensures that the return spring 11 will not deflect after being squeezed, and ensures that the return spring 11 can push the piston 4 back to the initial position after the high-pressure gas supply stops.

[0035] A clearance hole 17 is provided on the valve seat 2 at the position corresponding to the positioning rod 12, and one end of the positioning rod 12 is slidably disposed in the clearance hole 17.

[0036] The positioning rod 12 slides inside the relief hole 17. When the piston 4 is pushed by high-pressure gas to move towards the valve seat 2, the positioning rod 12 also moves with the piston 4. The end of the positioning rod 12 will pass through the relief hole 17 and protrude from the valve seat 2, making it easier for workers to observe whether the color change control valve is working properly.

[0037] The first sealing element 13 is inserted into the side wall of the through hole 7 near both ends of the through hole 7.

[0038] The sealing between the piston rod 5 and the valve body 1 is improved by the first sealing element 13 at both ends of the through hole 7, preventing paint from leaking into the valve cavity 3 through the gap and affecting the normal use of the color change control valve.

[0039] The valve body 1 has a detection hole 10 on its side wall. The detection hole 10 is connected to the through hole 7, and the position where the detection hole 10 is connected to the through hole 7 is located between the first sealing elements 13 at both ends of the through hole 7.

[0040] The first seal 13 inside the through hole 7 is checked by the inspection hole 10. If the first seal 13 is damaged, paint will leak into the through hole 7 and then flow out from the inspection hole 10. This allows for timely judgment of whether the color change control valve is working properly, thus avoiding color mixing and affecting the painting quality of the car.

[0041] The valve body 1 has an annular air groove 8 on its side wall, and one end of the air delivery channel 9 is located at the bottom of the annular air groove 8.

[0042] The valve body 1 has multiple gas delivery channels 9 on its side wall. The gas delivery channels 9 are located at the bottom of the annular gas groove 8. The annular gas groove 8 can evenly deliver high-pressure gas to each gas delivery channel 9, ensuring that the piston 4 is subjected to uniform force, thereby ensuring the stable movement of the piston 4 and thus ensuring the stability of the movement of the plug 6.

[0043] The valve body 1 has a first sealing ring 15 on both sides of the annular air groove 8.

[0044] The sealing performance at the annular gas groove 8 is improved by the first sealing ring 15, which prevents leakage when high-pressure gas is delivered into the annular gas groove 8, thus preventing insufficient gas pressure on the piston 4 and making it unable to move.

[0045] The piston 4 has a second seal 16 mounted on its side wall.

[0046] The second seal 16 improves the sealing between the piston 4 and the side wall of the valve chamber 3, preventing high-pressure gas from leaking from the gap and ensuring that the piston 4 can move under air pressure.

[0047] Valve seat 2 is engaged with valve body 1, and piston rod 5 is engaged with plug 6.

[0048] The snap-fit ​​design facilitates installation and improves connection stability, preventing loosening over time.

[0049] A second sealing ring 14 is fitted onto the end face of the valve body 1 at the end with the through hole 7.

[0050] The second sealing ring 14 improves the sealing between the color-changing control valve and the mounting base during installation and use, preventing paint leakage from the gap between the color-changing control valve and the mounting base.

[0051] In use, a mounting thread is provided on the side of the valve seat 2. The color-changing control valve is installed on the mounting seat of the paint pipeline through the mounting thread. The plug 6 is sealed on the paint pipeline, closing it off and keeping the paint pipeline in a normally closed state. The gas supply pipe on the mounting seat is connected to the annular gas groove 8. If this color of paint is to be used, high-pressure gas is supplied to the annular gas groove 8 through the gas supply pipe. The high-pressure gas enters the gas supply channel 9 from the annular gas groove 8 and reaches the piston 4 from the gas supply channel 9. The piston 4 is pushed towards the valve seat 2 by the pressure of the high-pressure gas, and at the same time, it compresses the return spring 11 in the valve cavity 3. The return spring 11 contracts, and the piston 4 moves in the same direction. The piston rod 5 and the positioning rod 12 move together. The piston rod 5 moves the plug 6, which separates from the paint pipe, allowing the paint pipe to be connected and the paint to be delivered to the spray gun head. The positioning rod 12 moves within the relief hole 17, and the end of the positioning rod 12 protrudes from the valve seat 2, allowing the worker to observe the movement of the piston 4 and thus determine whether the color change control valve is working properly. After the paint of that color is sprayed, the high-pressure gas supply stops, and the piston 4 returns to its initial position under the elastic force of the return spring 11, which in turn moves the plug 6 to the paint pipe, blocking the paint pipe of that color and stopping the delivery of that color of paint to the spray gun head.

[0052] In actual use, the piston 4 has a threaded hole, and the end of the positioning rod 12 is threaded. The positioning rod 12 is threadedly connected to the piston 4, which facilitates installation.

[0053] Both the first seal 13 and the second seal 16 are made of plug seals, which can provide a good dynamic sealing effect and ensure the sealing performance when the piston 4 and piston rod 5 move.

[0054] The valve seat 2 has an air hole that communicates with the valve chamber 3, so that when the piston 4 moves toward the valve seat 2, the gas between the piston 4 and the valve seat 2 can be discharged, preventing the gas between the piston 4 and the valve seat 2 from being compressed and the gas pressure from rising, affecting the movement of the piston 4 and causing the plug 6 to fail to open normally.

[0055] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A color-changing control valve for a paint spraying system, characterized in that, The valve body includes a valve cavity at one end, a valve seat is fitted at that end, and a through hole communicating with the valve cavity at the other end. A piston is provided in the valve cavity, and a piston rod is provided on the side of the piston away from the valve seat. One end of the piston rod passes through the through hole and is fitted with a plug. A return spring is provided in the valve cavity, with one end abutting against the piston and the other end abutting against the valve seat. An air supply channel communicating with the valve cavity is provided in the valve body, with one end of the air supply channel located adjacent to the side of the piston where the piston rod is located, and the other end located on the outer wall of the valve body.

2. The color-changing control valve for a spray painting system according to claim 1, characterized in that, The piston and the valve seat are provided with a positioning rod on their adjacent surfaces, and the return spring is sleeved on the positioning rod.

3. The color-changing control valve for a spray painting system according to claim 2, characterized in that, The valve seat has a clearance hole at the position corresponding to the positioning rod, and one end of the positioning rod is slidably disposed in the clearance hole.

4. The color-changing control valve for a paint spraying system according to claim 1, characterized in that, The first sealing element is inserted into the sidewall of the through hole near both ends of the through hole.

5. A color-changing control valve for a paint spraying system according to claim 4, characterized in that, The valve body sidewall is provided with a detection hole, which is connected to the through hole, and the position where the detection hole and the through hole are connected is located between the first sealing elements at both ends of the through hole.

6. A color-changing control valve for a paint spraying system according to claim 1, characterized in that, The valve body sidewall is provided with an annular air groove, and one end of the air delivery channel is located at the bottom of the annular air groove.

7. A color-changing control valve for a paint spraying system according to claim 6, characterized in that, The valve body has a first sealing ring on both sides of the annular air groove.

8. A color-changing control valve for a paint spraying system according to claim 1, characterized in that, The piston sidewall is fitted with a second seal.

9. A color-changing control valve for a spray painting system according to claim 1, characterized in that, The valve seat is engaged with the valve body, and the piston rod is engaged with the plug.

10. A color-changing control valve for a paint spraying system according to claim 1, characterized in that, A second sealing ring is fitted onto the end face of the valve body at the end with the through hole.

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