Multi-path coating pneumatic spray gun

Abstract

The utility model relates to the technical field of pneumatic spray guns, and discloses a multi-path paint pneumatic spray gun which comprises a plurality of paths of pneumatic spray gun components which are detachably connected, the pneumatic spray gun assembly comprises a front end cover, a spray gun body, a valve seat, a coating cavity, a valve element, a pre-tightening spring, a convex check ring, a concave sealing ring, an outer side check ring, a piston cavity, a piston, a rear end cover, a reset spring, a coating feeding connector, a coating returning connector, a coating channel, a nozzle and an air inlet. By the adoption of the mechanism, paint of different colors can be directly sprayed out without cleaning a whole pipeline system from a spraying machine to a spray gun nozzle, the pneumatic spray gun assembly on the tail path can be communicated with a cleaning agent or compressed air to serve as a cleaning spray gun, and after different kinds of paint are sprayed, the pneumatic spray gun assembly on the tail path is opened to clean the spray gun. And other residual coatings in the coating channel are cleaned by using a cleaning agent or compressed air, and then the pneumatic spray gun assemblies on other paths are opened to spray other types of coatings.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic spray guns, in particular to a multi-channel pneumatic spray gun for coatings. Background Art

[0002] In automatic spraying lines such as steel plate pretreatment and steel drum spraying, it is necessary to frequently change different types or colors of paint. When changing, the entire pipeline system from the sprayer to the spray gun nozzle must be cleaned, which is time-consuming and labor-intensive and wastes paint and thinners. In order to improve production efficiency and save paint and thinners, multiple sprayers and multiple pipelines can be configured to solve the problem. Therefore, a multi-channel paint pneumatic spray gun needs to be designed. Utility Model Content

[0003] The utility model mainly provides a multi-channel pneumatic paint spray gun to solve the problem that on the existing automatic spraying line, different types or colors of paint need to be frequently replaced, and the entire pipeline system from the sprayer to the spray gun nozzle must be cleaned during replacement, which is time-consuming, labor-intensive and wastes paint and thinner.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A multi-channel paint pneumatic spray gun, comprising a multi-channel detachably connected pneumatic spray gun assembly, the pneumatic spray gun assembly comprising a front end cover, the front end cover is detachably connected to a spray gun body, a valve seat is arranged at the connection between the front end cover and the spray gun body, a paint cavity matching the valve seat is provided on the spray gun body, a valve core matching the valve seat is arranged in the paint cavity, a preload spring, a convex retaining ring, a concave sealing ring and an outer retaining ring are arranged on the valve core from left to right in sequence, a piston cavity is provided on the spray gun body, and a The piston of the valve core and the rear end of the spray gun body are detachably connected with a rear end cover, and a return spring is arranged between the piston and the rear end cover; the spray gun body corresponding to the two sides of the paint cavity is connected with a paint feed joint and a paint return joint; the front end cover is provided with a paint channel for conveying paint, and the paint channels of the adjacent front end covers are connected, and the front end cover of the main road is provided with a nozzle, and the nozzle is connected with the paint channel of the main road; the spray gun body is provided with an air inlet connected with the piston cavity. Among them, the multi-way pneumatic spray gun assembly is detachably connected, the pneumatic spray gun assembly at the head end is the main road pneumatic spray gun assembly, and the front end cover on it is the front end cover of the main road, and the pneumatic spray gun assembly at the end end is the final road pneumatic spray gun assembly, and the front end cover on it is the final road front end cover. All the front end covers are provided with paint channels, and the paint channel on a front end cover is connected with the discharge port of the valve seat on the spray gun body to which it is detachably connected, and is connected with the adjacent paint channel; the paint channel of the main road is also connected with the nozzle. The spray gun body is a rectangular parallelepiped component with a square cross section, and the paint cavity is opened along its central axis. The direction of setting the paint feed joint and the paint return joint is perpendicular to the central axis of the paint cavity. The cross section of the front end cover is a square with the same size as the cross section of the spray gun body. The paint channel on the central axis of the front end cover is connected to the outlet of the valve seat provided on the spray gun body with which it is detachably connected. The front end cover of the main road is provided with a vertical downward paint channel connected to the paint channel on the central axis, the front end cover of the bypass is provided with a vertical vertically penetrating paint channel connected to the paint channel on the central axis, and the front end cover of the terminal road is provided with a vertical upward paint channel connected to the paint channel on the central axis. When in use, different colors of paint output from the sprayer can be connected to the paint feed connectors of different spray gun bodies, and then connected to the sprayer from the paint return connector; an air inlet connector is provided at the air inlet to connect compressed air. Under the action of the return spring, the valve seat and the valve core are in a closed state. When a certain paint needs to be sprayed, the air inlet switch of the spray gun body connected to the paint is turned on, and the compressed air enters the large hole of the piston cavity to push the piston, overcome the force of the return spring to move to the right, and drive the valve core to move to the right. The paint moves from the paint channel on the central axis of the front end cover of the valve seat to the nozzle and is sprayed out from the nozzle. Under normal circumstances, all spray guns are in a closed state. When a certain paint needs to be sprayed, the air inlet switch of the pneumatic spray gun of that paint can be turned on.By adopting the mechanism of the present application, a pneumatic spray gun assembly is connected to one color of paint, and multiple colors of paint can be coordinated through a multi-channel pneumatic spray gun assembly, so that different types of colors of paint can be directly sprayed without cleaning the entire pipeline system from the sprayer to the spray gun nozzle, and the pneumatic spray gun assembly at the end of the channel can be connected to a cleaning agent or compressed air to clean the spray gun. After spraying different types of paint, the pneumatic spray gun assembly at the end of the channel is opened, and other residual paints in the paint channel are cleaned with a cleaning agent or compressed air, and then other pneumatic spray gun assemblies are opened to spray other types of paint.

[0006] Furthermore, a first cylinder is provided on the front end cover of the main passage, and the first cylinder is threadedly connected to the nozzle. The central axis of the first cylinder coincides with the central axis of the coating cavity. This structure can facilitate the installation and connection of the nozzle.

[0007] Furthermore, a valve seat sealing ring is arranged between the valve seat and the front end cover and the spray gun body. With this structure, the sealing effect can be enhanced.

[0008] Furthermore, the front end cover is detachably connected to the spray gun body by a first screw. The detachable connection by the first screw makes the connection structure simple and stable.

[0009] Furthermore, the valve core includes an outer sleeve, and a valve ball, a baffle, an inner and outer threaded sleeve and a pull rod are sequentially arranged in the outer sleeve from left to right. The left end of the pull rod is threadedly connected to the inner and outer threaded sleeve, and the right end of the pull rod passes through the preload spring, the convex baffle ring, the concave sealing ring, the outer baffle ring and the piston, and the pull rod is fixedly connected to the piston through a nut. With this structure, it is easy to fix the pull rod and the piston, and the pull rod can slide among the convex baffle ring, the concave sealing ring and the outer baffle ring, so as to conveniently discharge the paint into the paint channel, and the convex baffle ring, the concave sealing ring and the outer baffle ring can prevent the paint from entering the piston cavity.

[0010] Furthermore, the piston includes a piston body, a second cylinder arranged at the left end of the piston body, and a third cylinder arranged at the right end of the piston body; the piston cavity includes a piston cavity small hole matching the second cylinder and a piston cavity large hole matching the piston body, a first piston sealing ring is arranged between the second cylinder and the piston cavity small hole, and a second piston sealing ring is arranged between the piston body and the spray gun body; one end of the reset spring is sleeved on the outside of the third cylinder. The central axis of the piston cavity small hole and the piston cavity large hole coincides with the central axis of the coating cavity. With this structure, the compressed air entering through the air inlet can push the piston body toward the rear end cover, thereby driving the displacement of the pull rod, and the second cylinder can be limited and guided, and the third cylinder can facilitate the installation of the reset spring, and the overall structure is stable.

[0011] Furthermore, the rear end cover is detachably connected to the spray gun body by a second screw. The detachable connection by the second screw has a simple structure and a stable connection.

[0012] Furthermore, the front end covers of the end and the bypass are provided with bolt holes with the same position and through, and the front end cover of the main path is provided with threaded holes matching the bolt holes. The front end covers of the multiple paths are detachably connected by bolts, and channel sealing washers are provided at the connecting points of adjacent paint channels. In this way, all the multi-channel spray gun assemblies can be detachably connected together by bolts, and different numbers of spray gun assemblies use bolts of different lengths. And channel sealing washers are provided at the connecting points of adjacent paint channels. With this structure, the sealing of the connecting points of adjacent paint channels can be enhanced.

[0013] Furthermore, the spray gun body is also provided with an observation hole connected to the piston cavity small hole, wherein the setting direction of the observation hole is perpendicular to the central axis direction of the piston cavity small hole.

[0014] Furthermore, a mounting hole is provided on the spray gun body, and the spray gun body can be detachably connected to the spray line through the mounting hole. A fixing rod of the spray line is inserted through the mounting hole, so that the spray gun body is installed.

[0015] Beneficial effect: By adopting the mechanism of the present application, a pneumatic spray gun assembly is connected to one color of paint, and multiple colors of paint can be coordinated through a multi-channel pneumatic spray gun assembly, so that different types of colors of paint can be directly sprayed without cleaning the entire pipeline system from the sprayer to the spray gun nozzle, and the pneumatic spray gun assembly at the end of the channel can be connected to a cleaning agent or compressed air as a cleaning spray gun. After spraying different types of paint, the pneumatic spray gun assembly at the end of the channel is opened, and other residual paints in the paint channel are cleaned with a cleaning agent or compressed air, and then other pneumatic spray gun assemblies are opened to spray other types of paint. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional view of the spray gun body of this embodiment;

[0017] Figure 2 For this embodiment Figure 1 Middle AA section view;

[0018] Figure 3 For this embodiment Figure 1 BB cutaway diagram;

[0019] Figure 4 For this embodiment Figure 1 Schematic diagram of CC section view.

[0020] Figure numerals: front end cover 1, spray gun body 2, valve seat 3, valve core 4, preload spring 5, convex retaining ring 6, concave sealing ring 7, outer retaining ring 8, piston 9, rear end cover 10, return spring 11, paint channel 12, channel sealing gasket 13, first screw 14, valve seat sealing ring 15, first piston sealing ring 16, second piston sealing ring 17, nut 18, second screw 19, bolt 20, nozzle 21, paint feed connector 22, paint return connector 23, paint cavity 2a, mounting hole 2b, air inlet 2c, piston cavity small hole 2d, piston cavity large hole 2e, observation hole 2f, outer sleeve 41, valve ball 42, retaining plate 43, internal and external threaded sleeves 44, pull rod 45. DETAILED DESCRIPTION

[0021] The technical solution of a multi-channel pneumatic paint spray gun involved in the utility model will be further described in detail below in conjunction with embodiments.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a multi-channel paint pneumatic spray gun of this embodiment includes a multi-channel detachably connected pneumatic spray gun assembly, the pneumatic spray gun assembly includes a front end cover 1, a spray gun body 2 is detachably connected to the front end cover 1, a valve seat 3 is arranged at the connection between the front end cover 1 and the spray gun body 2, a paint cavity 2a matching the valve seat 3 is opened on the spray gun body 2, a valve core 4 matching the valve seat 3 is arranged in the paint cavity 2a, a preload spring 5, a convex retaining ring 6, a concave sealing ring 7 and an outer retaining ring 8 are arranged on the valve core 4 from left to right, a piston cavity is opened on the spray gun body 2, and a The piston 9 of the valve core 4 and the rear end of the spray gun body 2 are detachably connected with a rear end cover 10, and a return spring 11 is arranged between the piston 9 and the rear end cover 10; a paint feed connector 22 and a paint return connector 23 are connected and arranged on the spray gun body 2 corresponding to the two sides of the paint cavity 2a; a paint channel 12 for conveying paint is provided on the front end cover 1, and the paint channels 12 of the adjacent front end covers 1 are connected, and a nozzle 21 is arranged on the front end cover 1 of the main road, and the nozzle 21 is connected with the paint channel 12 of the main road; an air inlet 2c connected with the piston cavity is arranged on the spray gun body 2. Among them, the multi-way pneumatic spray gun assembly is detachably connected, the first end pneumatic spray gun assembly is the main road pneumatic spray gun assembly, and the front end cover 1 thereon is the front end cover 1 of the main road, and the last end pneumatic spray gun assembly is the final pneumatic spray gun assembly, and the front end cover 1 thereon is the final front end cover 1. All the front covers 1 are provided with paint channels 12, and the paint channel 12 on one front cover 1 is connected to the discharge port of the valve seat 3 on the spray gun body 2 to which it is detachably connected, and is connected to the adjacent paint channel 12; the paint channel 12 of the main path is also connected to the nozzle 21. The spray gun body 2 is a rectangular parallelepiped component with a square cross section, and the paint cavity 2a is opened along its central axis. The setting direction of the paint feed joint 22 and the paint return joint 23 is perpendicular to the central axis of the paint cavity 2a. The cross section of the front end cover 1 is a square with the same size as the cross section of the spray gun body 2. The paint channel 12 on the central axis of the front end cover 1 is connected to the discharge port of the valve seat 3 provided on the spray gun body 2 to which it is detachably connected. The front end cover 1 of the main road is provided with a vertically downward paint channel 12 communicating with the paint channel 12 on the central axis, the front end cover 1 of the bypass is provided with a vertically vertically penetrating paint channel 12 communicating with the paint channel 12 on the central axis, and the front end cover 1 of the terminal road is provided with a vertically upward paint channel 12 communicating with the paint channel 12 on the central axis. The front end cover 1 of the main road is provided with a first cylinder, and the first cylinder is threadedly connected to the nozzle 21. A valve seat sealing ring 15 is provided between the valve seat 3, the front end cover 1 and the spray gun body 2. The front end cover 1 is detachably connected to the spray gun body 2 by a first screw 14.The valve core 4 comprises a sleeve 41, in which a valve ball 42, a baffle 43, an internal and external threaded sleeve 44 and a pull rod 45 are arranged in sequence from left to right. The left end of the pull rod 45 is threadedly connected with the internal and external threaded sleeve 44, and the right end of the pull rod 45 passes through the preload spring 5, the convex baffle 6, the concave sealing ring 7, the outer baffle 8 and the piston 9, and the pull rod 45 is fixedly connected with the piston 9 through a nut 18. The piston 9 comprises a piston body, a second cylinder arranged at the left end of the piston body and a third cylinder arranged at the right end of the piston body; the piston cavity comprises a piston cavity small hole 2d matched with the second cylinder and a piston cavity large hole 2e matched with the piston body, a first piston sealing ring 16 is arranged between the second cylinder and the piston cavity small hole 2d, and a second piston sealing ring 17 is arranged between the piston body and the spray gun body 2; one end of the reset spring 11 is sleeved on the outside of the third cylinder. The rear end cover 10 is detachably connected to the spray gun body 2 by a second screw 19. The front end cover 1 of the end and bypass is provided with bolt holes in the same position and through, and the front end cover 1 of the main path is provided with a threaded hole matching the bolt hole. The front end cover 1 of the multi-path is detachably connected by a bolt 20, and a channel sealing gasket 13 is provided at the connection point of the adjacent paint channels 12. The spray gun body 2 is also provided with an observation hole 2f connected to the piston chamber small hole 2d. The spray gun body 2 is provided with a mounting hole 2b, and the multi-path spray gun body 2 is detachably connected to the spraying line through the mounting hole 2b. When in use, different colors of paint output from the sprayer can be connected to the paint feed connector 22 of different spray gun bodies, and then connected to the sprayer from the paint return connector 23; the air inlet 2c is provided with an air inlet connector to connect compressed air. Under the action of the return spring 11, the valve seat 3 and the valve core 4 are in a closed state. When a certain paint needs to be sprayed, the air inlet switch of the spray gun body connected to the paint is turned on, and the compressed air enters the large hole 2e of the piston cavity to push the piston 9, overcome the force of the return spring 11 to move to the right, and drive the valve core 4 to move to the right, and the paint moves from the paint channel 12 on the central axis of the front end cover 1 of the valve seat 3 to the nozzle 21, and is sprayed from the nozzle 21. Under normal circumstances, all spray guns are in a closed state. When a certain paint needs to be sprayed, the air inlet switch of the pneumatic spray gun of that paint can be turned on. By adopting the mechanism of the present application, a pneumatic spray gun assembly is connected to one color of paint, and multiple colors of paint can be coordinated through a multi-channel pneumatic spray gun assembly, so that different types of colors of paint can be directly sprayed without cleaning the entire pipeline system from the sprayer to the spray gun nozzle 21, and the pneumatic spray gun assembly at the end of the channel can be connected to a cleaning agent or compressed air as a cleaning spray gun. After spraying different types of paint, the pneumatic spray gun assembly at the end of the channel is opened, and the other remaining paints in the paint channel 12 are cleaned with a cleaning agent or compressed air, and then the pneumatic spray gun assemblies of other channels are opened to spray other types of paint.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-channel pneumatic paint spray gun, characterized in that: The invention comprises a pneumatic spray gun assembly with multiple detachable connections, the pneumatic spray gun assembly comprises a front end cover, a spray gun body is detachably connected to the front end cover, a valve seat is arranged at the connection between the front end cover and the spray gun body, a paint cavity matching the valve seat is provided on the spray gun body, a valve core matching the valve seat is provided in the paint cavity, a preload spring, a convex retaining ring, a concave sealing ring and an outer retaining ring are arranged on the valve core from left to right in sequence, a piston cavity is provided on the spray gun body, a piston matching the valve core is arranged in the piston cavity, and a rear end cover is detachably connected to the rear end of the spray gun body, and a return spring is arranged between the piston and the rear end cover; a paint feed joint and a paint return joint are connected and arranged on the spray gun body corresponding to the two sides of the paint cavity; a paint channel for conveying paint is provided on the front end cover, and the paint channels adjacent to the front end cover are connected, a nozzle is provided on the front end cover of the main road, and the nozzle is connected to the paint channel of the main road; an air inlet connected to the piston cavity is arranged on the spray gun body.

2. A multi-channel paint pneumatic spray gun according to claim 1, characterized in that: A first cylinder is arranged on the front end cover of the main passage, and the first cylinder is threadedly connected to the nozzle.

3. A multi-channel paint pneumatic spray gun according to claim 1, characterized in that: A valve seat sealing ring is arranged between the valve seat, the front end cover and the spray gun body.

4. A multi-channel paint pneumatic spray gun according to claim 1, characterized in that: The front end cover is detachably connected to the spray gun body via a first screw.

5. The multi-channel paint pneumatic spray gun according to claim 1, characterized in that: The valve core includes an outer sleeve, and a valve ball, a baffle, an internal and external threaded sleeve and a pull rod are arranged in the outer sleeve from left to right in sequence. The left end of the pull rod is threadedly connected to the internal and external threaded sleeve, and the right end of the pull rod passes through the preload spring, the convex baffle ring, the concave sealing ring, the outer baffle ring and the piston, and the pull rod is fixedly connected to the piston through a nut.

6. A multi-channel paint pneumatic spray gun according to claim 1, characterized in that: The piston includes a piston body, a second cylinder arranged at the left end of the piston body and a third cylinder arranged at the right end of the piston body; the piston cavity includes a piston cavity small hole matching the second cylinder and a piston cavity large hole matching the piston body, a first piston sealing ring is arranged between the second cylinder and the piston cavity small hole, and a second piston sealing ring is arranged between the piston body and the spray gun body; one end of the return spring is sleeved on the outside of the third cylinder.

7. A multi-channel paint pneumatic spray gun according to claim 1, characterized in that: The rear end cover is detachably connected to the spray gun body via a second screw.

8. The multi-channel paint pneumatic spray gun according to claim 1, characterized in that: The front end covers of the end and bypass are provided with bolt holes with the same position and through, and the front end cover of the main road is provided with threaded holes matching the bolt holes. The front end covers of multiple roads are detachably connected by bolts, and channel sealing gaskets are provided at the connecting points of adjacent paint channels.

9. A multi-channel paint pneumatic spray gun according to claim 1, characterized in that: The spray gun body is also provided with an observation hole connected to the small hole of the piston chamber.

10. The multi-channel pneumatic spray gun according to claim 1, characterized in that: The spray gun body is provided with a mounting hole, and the spray gun body can be detachably connected to the spraying line through the mounting hole.

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