Low-air-pressure automatic spray gun

Abstract

The utility model discloses a low-air-pressure automatic spray gun, which relates to the technical field of spray guns and comprises a gun body provided with a coating channel, an opening and closing air pressure channel, a spray shape air pressure channel and a spray width air pressure channel. The spraying cover is positioned on the output cavity; the coating nozzle is located between the output cavity and the spraying cover. Independent air sources are connected into an opening and closing air pressure inlet, a spraying shape air pressure inlet and a spraying width air pressure inlet respectively to control opening and closing of the spraying gun, atomization spraying shape and spraying width fan-shaped adjustment, and the fog face effect with the very long spraying width and the very thin atomization can be achieved through low air pressure adjustment. The paint channel forms paint backflow circulation and has a paint backflow function, so that the paint is prevented from caking and precipitating in the spray gun to form local blockage, and the stability of the spraying width shape of sprayed paint mist is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of spray guns, in particular to a low-pressure automatic spray gun. Background Art

[0002] The spray gun is the main tool used in spraying operations. The paint liquid of the spray gun is mixed with compressed air and pressurized before being sprayed to form a paint mist, and the automatic spray gun with automatic control has higher working efficiency and safety. However, in the face of coatings with relatively high viscosity, since such coatings are prone to form lumps and precipitates, resulting in local blockages, the shape of the paint mist spray pattern is unstable, and even directly affects the normal progress of the coating spraying work. It is necessary to increase the air pressure to ensure the spraying effect. However, the spraying method with increased air pressure is prone to cause excessive impact force of the coating and excessive scattering, which not only wastes the coating, but also makes the shape of the paint mist spray pattern unstable, directly affecting the uniformity of coating spraying. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a low-pressure automatic spray gun.

[0004] The low-pressure automatic spray gun according to an embodiment of the utility model includes: a gun body having a coating channel, an opening and closing air pressure channel, a spray shape air pressure channel, and a spray pattern air pressure channel. An output cavity is provided on the front side of the gun body, and an input cavity is provided on the rear side of the gun body. The opening and closing air pressure channel is communicated with an opening and closing air pressure inlet and the input cavity. The spray shape air pressure channel is communicated with a spray shape air pressure inlet and the output cavity. The spray pattern air pressure channel is communicated with a spray pattern air pressure inlet and the output cavity. A spray cover is located on the output cavity. The spray cover has an intermediate buffer cavity and spray pattern holes on the side. A coating spray port is provided on the intermediate buffer cavity. A coating nozzle is located between the output cavity and the spray cover. The coating nozzle includes an intermediate nozzle. The front and rear ends of the intermediate nozzle are respectively communicated with the coating spray port and the coating channel. A spray shape channel and a spray pattern channel are formed between the spray cover and the output cavity. Among them, the spray shape channel is communicated with the spray shape air pressure channel, and the spray pattern channel is communicated with the spray pattern air pressure channel.

[0005] According to some embodiments of the utility model, the side wall of the gun body is provided with a coating inlet, a coating outlet, an opening and closing air pressure inlet, a spray shape air pressure inlet, and a spray pattern air pressure inlet. The coating inlet and the coating outlet are communicated with the coating channel. The coating inlet and the coating outlet are located on the left and right sides of the gun body. An intermediate nozzle installation cavity is provided in the middle of the coating channel. The rear end of the intermediate nozzle is connected to the intermediate nozzle installation cavity.

[0006] According to some embodiments of the present utility model, the opening and closing air pressure channel is located on the upper side of the gun body, and the spray shape air pressure channel and the spray width air pressure channel are located on the lower side of the gun body.

[0007] According to some embodiments of the present utility model, the side flow dividing ring is provided with flow dividing holes.

[0008] According to some embodiments of the present utility model, the side flow dividing ring sequentially includes an inner flow dividing plate and an outer flow dividing boss from the inside to the outside. The flow dividing holes are located on the inner flow dividing plate, and the outer flow dividing boss is located between the spray width channel and the spray width holes.

[0009] According to some embodiments of the present utility model, the inner wall surface of the output cavity is provided with a spray shape channel step surface, an output cavity dividing step portion, and a spray width channel step surface. The output cavity dividing step portion is located between the spray shape channel step surface and the spray width channel step surface. The output cavity dividing step portion can be connected to the side flow dividing ring to separate the spray shape channel from the spray width channel. The spray shape channel step surface has a spray shape air pressure outlet communicating with the spray shape air pressure channel and the spray shape channel, and the spray width channel step surface has a spray width air pressure outlet communicating with the spray width air pressure channel and the spray width channel.

[0010] According to some embodiments of the present utility model, the output cavity dividing step portion is provided with a recessed buffer position, and the spray shape air flow output from the spray shape air pressure outlet enters the spray shape channel after passing through the recessed buffer position.

[0011] According to some embodiments of the present utility model, a paint hole plug is provided on the paint outlet.

[0012] According to some embodiments of the present utility model, a thimble tightening nut is provided between the paint channel and the input cavity. The thimble sequentially passes through the input cavity, the thimble tightening nut, and the intermediate nozzle, and the front end of the thimble extends to the front end position of the intermediate nozzle.

[0013] According to some embodiments of the present utility model, a paint adjusting guide seat group and a thimble seat are provided on the input cavity. A thimble spring is provided between the paint adjusting guide seat group and the thimble seat, and the thimble seat is connected to the rear end position of the thimble.

[0014] The low-pressure automatic spray gun according to the embodiment of the present utility model has at least the following technical effects: By connecting independent air sources to the opening and closing air pressure inlet, spray shape air pressure inlet, and spray width air pressure inlet respectively, it can control the spray gun switch, atomization spray shape, and spray width fan shape adjustment. It is equivalent to independently controlling the pressure and flow rate of the spray width air pressure and the intermediate atomization air pressure. It can adjust a very long spray width and a very thin atomization mist surface effect at low air pressure, which can save paint and improve the spraying efficiency; the paint channel is connected to the outside paint source through the paint inlet, paint outlet to form a paint reflux cycle, and has a paint reflux function, which can avoid the formation of lumps and precipitation in the spray gun of the present utility model to form local blockages, ensure the stability of the spray width shape of the sprayed paint mist, and the spraying effect is good enough, and it is suitable for paints with high viscosity and easy precipitation.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, and in part will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a perspective view of the low-pressure automatic spray gun of the present utility model;

[0018] Figure 2 is a perspective view of the low-pressure automatic spray gun of the present utility model from another angle;

[0019] Figure 3 is a working schematic diagram of the low-pressure automatic spray gun of the present utility model;

[0020] Figure 4 is a perspective sectional view of the low-pressure automatic spray gun of the present utility model corresponding to the position of the paint channel;

[0021] Figure 5 is a perspective sectional view of the low-pressure automatic spray gun of the present utility model corresponding to the spray width air pressure channel;

[0022] Figure 6 is a perspective sectional view of the low-pressure automatic spray gun of the present utility model corresponding to the positions of the opening and closing air pressure channel and the spray shape air pressure channel;

[0023] Figure 7 is an exploded view of the structure of the low-pressure automatic spray gun of the present utility model;

[0024] Figure 8 is a perspective sectional view of the gun body of the present utility model corresponding to the position of the paint channel;

[0025] Figure 9 is a perspective sectional view of the gun body of the present utility model corresponding to the spray width air pressure channel;

[0026] Figure 10 is a three-dimensional sectional view of the gun body corresponding to the positions of the opening and closing air pressure channel and the spraying air pressure channel in the present utility model;

[0027] Figure 11 is a three-dimensional sectional view of the spray cover in the present utility model;

[0028] Figure 12 is a three-dimensional sectional view of the paint nozzle in the present utility model.

[0029] Reference numerals:

[0030] gun body 100, output cavity 110, spraying channel 111, spraying width channel 112, spraying channel step surface 113, output cavity partition step portion 114, spraying width channel step surface 115, recessed buffer position 116, spraying width buffer convex portion 117, input cavity 120, paint channel 130, paint inlet 131, paint outlet 132, intermediate nozzle mounting cavity 133, tightening nut mounting port 134, opening and closing air pressure channel 140, opening and closing air pressure inlet 141, spraying air pressure channel 150, spraying air pressure inlet 151, spraying air pressure outlet 152, spraying width air pressure channel 160, spraying width air pressure inlet 161, spraying width air pressure outlet 162, air plug 170; spray cover 200, intermediate buffer cavity 210, paint spray opening 220, spraying width angle 230, spraying width hole 231, spraying width opening 232, rear inclined surface of spraying width angle 233; paint nozzle 300, intermediate nozzle 310, side flow dividing ring 320, inner flow dividing plate 321, flow dividing hole 322, outer flow dividing convex platform 323, front inclined surface of convex platform 324, rear inclined surface of convex platform 325; ejector pin 400, ejector pin tightening nut 410, rear sealing ring of ejector pin 411, rear sealing ring of tightening nut 412, front U-shaped sealing ring of ejector pin 420, first sealing sleeve of ejector pin 421, second sealing sleeve of ejector pin 422; paint adjusting guide seat group 500, ejector pin seat 510, guide seat sealing ring 511, ejector pin fixing nut 512, ejector pin spring 520; paint hole plug 600, plug screw 610. Detailed Description of the Invention

[0031] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as limiting the present utility model.

[0032] In the description of the present utility model, it should be understood that for the orientation descriptions, such as the upper, lower, front, rear, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0033] In the description of the present utility model, the meaning of "a plurality" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0034] In the description of the present utility model, unless otherwise clearly defined, words such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the technical field can reasonably determine the specific meaning of the above words in the present utility model in combination with the specific content of the technical solution.

[0035] The following refers to Figure 1 、 Figure 2 and Figure 3 describe a low-pressure automatic spray gun according to an embodiment of the present utility model.

[0036] As Figure 1 、 Figure 2 and Figure 3 shown, a low-pressure automatic spray gun according to an embodiment of the present utility model includes a gun body 100, a spray cover 200, and a paint nozzle 300.

[0037] The gun body 100 has a paint channel 130, an opening and closing air pressure channel 140, a spray shape air pressure channel 150, and a spray width air pressure channel 160. An output cavity 110 is provided on the front side of the gun body 100, and an input cavity 120 is provided on the rear side of the gun body 100. The opening and closing air pressure channel 140 is communicated with the input cavity 120. The spray shape air pressure channel 150 is communicated with a spray shape air pressure inlet 151 and the output cavity 110. The spray width air pressure channel 160 is communicated with a spray width air pressure inlet 161 and the output cavity 110. The spray cover 200 is located on the output cavity 110. The spray cover 200 has an intermediate buffer cavity 210 and spray width holes 231 on the side. A paint spray port 220 is provided on the intermediate buffer cavity 210. The paint nozzle 300 is located between the output cavity 110 and the spray cover 200. The paint nozzle 300 includes an intermediate nozzle 310. The front and rear ends of the intermediate nozzle 310 are respectively communicated with the paint spray port 220 and the paint channel 130. A spray shape channel 111 and a spray width channel 112 are formed between the spray cover 200 and the output cavity 110. Among them, the spray shape channel 111 is communicated with the spray shape air pressure channel 150, and the spray width channel 112 is communicated with the spray width air pressure channel 160.

[0038] For example, as Figure 3 shown, the gun body 100 has a paint channel 130, an opening and closing air pressure channel 140, a spray shape air pressure channel 150, and a spray width air pressure channel 160. Among them, the paint channel 130 serves as the channel for paint, while the opening and closing air pressure channel 140, the spray shape air pressure channel 150, and the spray width air pressure channel 160 all serve as the channels for air flow. An output cavity 110 is provided on the front side of the gun body 100, and an input cavity 120 is provided on the rear side of the gun body 100.

[0039] Referring to Figure 6 , the opening and closing air pressure channel 140 communicates with the input cavity 120. That is, after the opening and closing air pressure channel 140 communicates with the outside through the opening and closing air pressure inlet, it guides the air flow into the input cavity 120. The spray shape air pressure channel 150 communicates with the spray shape air pressure inlet and the output cavity 110. That is, after the spray shape air pressure channel 150 communicates with the outside through the spray shape air pressure inlet, it guides the air flow into the output cavity 110. Referring to Figure 5 , the spray width air pressure channel 160 communicates with the spray width air pressure inlet and the output cavity 110. That is, after the spray width air pressure channel 160 communicates with the outside through the spray width air pressure inlet, it also guides the air flow into the output cavity 110.

[0040] The spray cover 200 is located on the output cavity 110, and there is a space between the spray cover 200 and the output cavity 110. Referring to Figure 3 , Figure 4 , the spray cover 200 has an intermediate buffer cavity 210 and spray width holes 231 on the side. A paint spray nozzle 220 is provided on the intermediate buffer cavity 210. The intermediate buffer cavity 210, the spray width holes 231 communicate with the output cavity 110. The paint nozzle 300 is located between the output cavity 110 and the spray cover 200. The paint nozzle 300 includes an intermediate nozzle 310. The front and rear ends of the intermediate nozzle 310 communicate with the paint spray nozzle 220 and the paint channel 130 respectively. After the paint passes through the intermediate nozzle 310, it is sprayed out from the paint spray nozzle 220 to form a paint mist.

[0041] After the spray cover 200 and the coating nozzle 300 are installed on the output cavity 110, a spray pattern channel 111 and a spray width channel 112 are formed. The air entering the spray pattern channel 111 from the spray pattern air pressure channel 150 serves as the spray pattern air flow. The output end of the spray pattern air flow is located at the gap between the middle nozzle 310 and the coating spray orifice 220. That is, the air flow entering the spray pattern air pressure channel 150 from the spray pattern air pressure inlet serves as the spray pattern air flow after reaching the spray pattern channel 111, and after passing through the spray pattern channel 111 between the spray cover 200 and the coating nozzle 300, it sprays out from the gap between the middle nozzle 310 and the coating spray orifice 220. The air entering the spray width channel 112 from the spray width air pressure channel 160 serves as the spray width air flow, and the spray width channel 112 communicates with the spray width orifice 231. That is, the air flow entering the spray width air pressure channel 160 from the spray width air pressure inlet serves as the spray width air flow after reaching the spray width channel 112, and after passing through the spray width channel 112 between the spray cover 200 and the coating nozzle 300, it sprays out from the spray width orifice 231.

[0042] During actual operation, the low-pressure automatic spray gun of the embodiment of the present utility model realizes automatic operation through an external air source. The spray gun of the present utility model controls the spray gun switch (CYL), atomization spray pattern (CAP), and spray width fan adjustment (FAN) by connecting to independent air sources through the opening and closing air pressure inlet of the opening and closing air pressure channel 140, the spray pattern air pressure inlet of the spray pattern air pressure channel 150, and the spray width air pressure inlet of the spray width air pressure channel 160 respectively.

[0043] Refer to Figure 4 , wherein the air flow of the CYL air source enters the input cavity 120 through the opening and closing air pressure inlet 141 under the guidance of the opening and closing air pressure channel 140, and triggers the control of the gun needle to close in the input cavity 120. Specifically, a solenoid valve or a mechanical valve can be used as the switch. When the CYL air source is on, the spray gun discharges oil; when the CYL air source is off, the spray gun is closed. For example, taking the ejector pin 400 as a mechanical valve, when the CYL air source is on, the air flow in the input cavity 120 drives the ejector pin 400 to move backward, and the middle nozzle 310 of the coating nozzle 300 can discharge oil. When the CYL air source is off, the ejector pin 400 resets and moves forward, and the middle nozzle 310 no longer discharges oil.

[0044] It can be imagined that on the premise of ensuring that the switch can be triggered by the gas in the input cavity 120, the switch can adopt the existing switch structure in the spray gun technology.

[0045] Refer to Figure 5 , the air flow of the FAN air source enters the spray width channel 112 of the output cavity 110 after entering the spray width air pressure channel 160 through the spray width air pressure inlet 161. Adjusting the air pressure of the FAN air source can change the size of the spray width fan. Refer to Figure 6, the CAP air source enters the spray air pressure channel 150 through the spray air pressure inlet 151 and is then guided into the spray channel 111 of the output cavity 110. In this way, the atomization effect can be controlled by adjusting the pressure of the CAP air source. When the paint flow rate is larger, it is necessary to increase the air pressure of the CAP air source. In this way, the pressure and flow rate of the spray width air pressure and the intermediate atomization air pressure can be independently controlled. A very long spray width and very thin atomization mist surface effect can be adjusted at low air pressure, which can save paint and improve the spraying efficiency.

[0046] In some embodiments of the present invention, referring to Figure 1 , Figure 2 , Figure 3 , on the side wall of the gun body 100, there are provided a paint inlet 131, a paint outlet 132, an opening and closing air pressure inlet 141, a spray air pressure inlet 151, and a spray width air pressure inlet 161. The opening and closing air pressure inlet 141 serves as the opening and closing air pressure connection port of the opening and closing air pressure channel 140. The spray air pressure inlet 151 serves as the spray air pressure connection port of the spray air pressure channel 150. The spray width air pressure inlet 161 serves as the spray width air pressure connection port of the spray width air pressure channel 160. The paint inlet 131 and the paint outlet 132 are communicated with the paint channel 130, and the paint inlet 131 and the paint outlet 132 are located on the left and right sides of the gun body 100. An intermediate nozzle installation cavity 133 is provided in the middle of the paint channel 130, and the rear end of the intermediate nozzle 310 is connected to the intermediate nozzle installation cavity 133. In this way, a more reliable paint return channel is formed. The paint enters from the paint inlet 131, and after passing through the paint nozzle 300 of the intermediate nozzle installation cavity 133, the surplus paint is recycled from the paint outlet 132. The paint channel 130 is communicated with the outside through the paint inlet 131 and the paint outlet 132. The paint inlet 131 and the paint outlet 132 are communicated with the paint channel 130, that is, the paint channel 130 is communicated with the outside through the paint inlet 131 and the paint outlet 132 to form a paint return cycle. In this way, the paint spray gun of the present invention has a paint return function, which can avoid the formation of lumps and precipitation in the paint spray gun of the present invention to form local blockages, ensure the stability of the spray width shape of the sprayed paint mist, and the spraying effect is good enough, and it is suitable for paints with high viscosity and easy precipitation.

[0047] In some embodiments of the present invention, the opening and closing air pressure channel 140 is located on the upper side of the gun body 100, and the spray air pressure channel 150 and the spray width air pressure channel 160 are located on the lower side of the gun body 100. In this way, the opening and closing air pressure channels 140 with larger air pressure requirements are arranged on the upper side, while the spray air pressure channel 150 and the spray width air pressure channel 160 with smaller air pressure requirements are arranged on the lower side, which is convenient for the distribution and connection of different air pressure air sources.

[0048] In some embodiments of the present invention, referring to Figure 3 , Figure 12, a side shunt ring 320 is provided on the outer wall of the middle nozzle 310. The side shunt ring 320 divides the output cavity 110 into a spray channel 111 and a spray width channel 112, ensuring that the spray channel 111 and the spray width channel 112 are separated from each other. The side shunt ring 320 is provided with shunt holes 322, so that the spray-shaped air flow formed by the spray channel 111 can pass through the shunt holes 322 to reach the position of the middle buffer cavity 210 of the spray cover 200.

[0049] In some embodiments of the present invention, referring to Figure 8 , Figure 9 , Figure 10 , a spray channel step surface 113, an output cavity separation step portion 114, and a spray width channel step surface 115 are provided on the inner wall surface of the output cavity 110. The output cavity separation step portion 114 is located between the spray channel step surface 113 and the spray width channel step surface 115. The output cavity separation step portion 114 can be connected to the side shunt ring 320 to separate the spray channel 111 and the spray width channel 112. The spray channel step surface 113 has a spray pressure outlet 152 and a spray pressure channel 150 communicating with the spray channel 111. The spray width channel step surface 115 has a spray width pressure outlet 162 and a spray width pressure channel 160 communicating with the spray width channel 112. The side shunt ring 320 on the paint nozzle 300 is butted against the output cavity separation step portion 114 to separate the spray channel 111 and the spray width channel 112, ensuring that the spray-shaped air flow in the spray channel 111 and the spray width air flow in the spray width channel 112 will not be confused due to leakage, affecting the air flow stability. The position structure of the output cavity 110 designed above is more compact and is also easy to process.

[0050] In some embodiments of the present invention, a recessed buffer position 116 is provided on the output cavity separation step portion 114. The spray-shaped air flow output from the spray pressure outlet 152 enters the spray channel 111 after passing through the recessed buffer position 116, so that the spray-shaped air flow output from the spray pressure outlet 152 can be buffered and then enter the middle buffer cavity 210 to make the atomization effect more uniform.

[0051] In some embodiments of the present invention, a spray width buffer convex portion 117 is provided on the front side of the output cavity 110. The spray width buffer convex portion 117 is located between the spray width channel 112 and the spray width hole 231, and can buffer the air flow entering the spray width hole 231 to ensure smoother spray width adjustment.

[0052] In some specific embodiments of the present invention, a number of shunt holes 322 are distributed around the side shunt ring 320, increasing the air flow volume entering the middle nozzle 310, and at the same time playing a better buffering role, making the air flow more uniform and smooth.

[0053] In some embodiments of the present utility model, the side flow splitter ring 320 sequentially includes an inner flow splitter plate 321 and an outer flow splitter boss 323 from inside to outside. The flow splitting holes 322 are located on the inner flow splitter plate 321, and the outer flow splitter boss 323 is located between the spray pattern channel 112 and the spray pattern holes 231. The outer flow splitter boss 323 is used to separate the spray shape channel 111 and the spray pattern channel 112. And the outer flow splitter boss 323 being located between the spray pattern channel 112 and the spray pattern holes 231 can play a buffering role for the spray pattern air flow passing between the spray pattern channel 112 and the spray pattern holes 231.

[0054] In some embodiments of the present utility model, a boss rear inclined surface 325 is provided at the rear side of the outer flow splitter boss 323, and the output cavity partition step portion 114 has an inclined surface. The boss rear inclined surface 325 on the outer flow splitter boss 323 abuts against the inclined surface of the output cavity partition step portion 114, which can improve the sealing performance and further ensure that the side flow splitter ring 320 separates the spray shape channel 111 and the spray pattern channel 112.

[0055] In some embodiments of the present utility model, referring to Figure 3 、 Figure 11 , a spray pattern angle 230 is provided on the side of the spray cap 200. The spray pattern holes 231 are located in the spray pattern angle 230, and spray pattern outlets 232 are distributed on the spray pattern angle 230 as the output ports of the spray pattern holes 231.

[0056] In some embodiments of the present utility model, spray pattern holes 231 and spray pattern outlets 232 are also provided at the position of the spray cap 200 around the paint spray port 220.

[0057] In some embodiments of the present utility model, referring to Figure 10 、 Figure 11 、 Figure 12 , a spray pattern angle rear inclined surface 233 is provided at the rear end position of the spray pattern holes 231, and a boss front inclined surface 324 is provided at the front side of the outer flow splitter boss 323. The boss front inclined surface 324 on the outer flow splitter boss 323 abuts against the spray pattern angle rear inclined surface 233, which can improve the sealing performance and further ensure that the side flow splitter ring 320 separates the spray shape channel 111 and the spray pattern channel 112.

[0058] In some embodiments of the present utility model, referring to Figure 5 、 Figure 6 、 Figure 7 , an air plug 170 is provided on the gun body 100 for plugging the redundant holes on the gun body 100. When machining the paint channel 130, the opening and closing air pressure channel 140, the spray shape air pressure channel 150, and the spray pattern air pressure channel 160 on the gun body 100, additional holes need to be opened to ensure the machining effect. After machining, these additionally opened holes can be plugged by the air plug 170.

[0059] In some embodiments of the present utility model, referring toFigure 2 , Figure 7 , a paint hole plug 600 is provided on the paint outlet 132 for blocking the paint outlet 132 or reducing the flow rate at the position of the paint outlet 132. That is, when the paint reflux is not required, the paint outlet 132 can be blocked by the paint hole plug 600. When it is necessary to reduce the flow rate by reducing the aperture of the paint outlet 132, a paint hole plug 600 with a suitable aperture is used.

[0060] Furthermore, the paint hole plug 600 is fixed on the paint outlet 132 by a plug screw 610.

[0061] In some embodiments of the present utility model, referring to Figure 4 , Figure 7 , a thimble tightening nut 410 is provided between the paint passage 130 and the input cavity 120. The thimble 400 passes through the input cavity 120, the thimble tightening nut 410, and the intermediate nozzle 310 in sequence. The front end of the thimble 400 extends to the front end position of the intermediate nozzle 310 to ensure that the thimble 400 can control the paint spraying of the intermediate nozzle 310 as a spray gun switch. The rear end of the thimble 400 extends into the input cavity 120 to ensure that the thimble 400 can be controlled. And the thimble tightening nut 410 ensures that the paint does not seep into the position of the input cavity 120 along the rear end of the thimble 400.

[0062] In some embodiments of the present utility model, referring to Figure 4 , Figure 7 , a tightening nut mounting port 134 is provided on the paint passage 130 for fixing the thimble tightening nut 410.

[0063] In a further embodiment of the present utility model, a thimble front U-shaped sealing ring 420 is provided on the thimble tightening nut 410. The thimble tightening nut 410 blocks the position of the tightening nut mounting port 134 through the thimble front U-shaped sealing ring 420 to prevent the paint at the tightening nut mounting port 134 from seeping into the input cavity 120.

[0064] In a further embodiment of the present utility model, a thimble rear sealing ring 411 is provided between the outer wall of the rear side of the thimble 400 and the rear end of the screw hole of the thimble tightening nut 410, and a tightening nut rear sealing ring 412 is provided between the outer wall of the thimble tightening nut 410 and the inner wall of the tightening nut mounting port 134 to further prevent the paint from seeping into the input cavity 120 along the thimble 400 or the thimble tightening nut 410.

[0065] In a further embodiment of the present utility model, a thimble first sealing sleeve 421 is provided at the front end of the thimble front U-shaped sealing ring 420, and a thimble second sealing sleeve 422 is provided between the thimble front U-shaped sealing ring 420 and the thimble first sealing sleeve 421 to further ensure the sealing effect when the thimble front U-shaped sealing ring 420 blocks the position of the tightening nut mounting port 134.

[0066] In some specific embodiments of the present utility model, the first sealing sleeve 421 of the ejector pin is conical, and the second sealing sleeve 422 of the ejector pin is O-shaped.

[0067] In some embodiments of the present utility model, a coating adjustment guide seat group 500 and an ejector pin seat 510 are arranged on the input cavity 120. An ejector pin spring 520 is arranged between the coating adjustment guide seat group 500 and the ejector pin seat 510, and the ejector pin seat 510 is connected to the rear end position of the ejector pin 400. The ejector pin spring 520 is used to provide a forward reset force for the ejector pin 400. The coating adjustment guide seat group 500 has an adjustment screw, and by adjusting the position of the adjustment screw, the pressure generated by the adjustment screw on the ejector pin spring 520 is controlled, which is equivalent to controlling the magnitude of the reset force of the ejector pin spring 520 on the ejector pin 400.

[0068] In some specific embodiments of the present utility model, a guide seat sealing ring 511 is arranged between the outer side wall of the ejector pin seat 510 and the inner wall of the input cavity 120 to ensure that the air flow in the input cavity 120 will not leak out between the ejector pin seat 510 and the input cavity 120, thereby ensuring the stability of the air pressure in the input cavity 120.

[0069] In some specific embodiments of the present utility model, the ejector pin 400 and the ejector pin seat 510 are fixed by an ejector pin fixing nut 512.

[0070] The automotive spray gun according to the second aspect embodiment of the present utility model includes the low-pressure automatic spray gun according to the first aspect embodiment of the present utility model above.

[0071] The automotive spray gun according to the embodiment of the present utility model, by adopting the above-mentioned low-pressure automatic spray gun, can spray a mist surface effect with a very long spray width and very thin atomization, can save paint, and can improve the spraying efficiency, and is applicable to automatic automotive spray guns.

[0072] The other configurations and operations of the automotive spray gun according to the embodiment of the present utility model are known to those of ordinary skill in the art and will not be described in detail here.

[0073] Next, refer to Figures 1 - 3 A low-pressure automatic spray gun according to an embodiment of the present utility model will be described in detail with reference to a specific embodiment. It should be understood that the following description is only an exemplary illustration and not a specific limitation of the utility model.

[0074] As Figures 1 - 3 shown, the low-pressure automatic spray gun according to the embodiment of the present utility model includes a gun body 100, a spray cap 200, a coating nozzle 300, an ejector pin 400, and a coating adjustment guide seat group 500.

[0075] The gun body 100 has a square main body. A circular output cavity 110 is provided on the front side of the square main body, and a circular input cavity 120 is provided on the rear side of the square main body. Refer to Figure 4 , Figure 8 , in the output cavity 110, there are provided a spray channel step surface 113, an output cavity partition step portion 114, a spray width channel step surface 115, a recessed buffer position 116, and a spray width buffer convex portion 117.

[0076] Refer to Figure 8 , in the square main body, there is provided a paint channel 130. A paint outlet 132 is provided on the left side of the square main body, and a paint inlet 131 is provided on the right side. In the middle of the paint channel 130, there are provided an intermediate nozzle mounting cavity 133 and a compression nut mounting opening 134, which are respectively used for mounting the paint nozzle 300 and the thimble compression nut 410. A paint plug 600 is installed on the paint outlet 132 through a plug screw 610.

[0077] Refer to Figure 9 , Figure 10 , in the square main body, there is provided an opening and closing air pressure channel 140, and an opening and closing air pressure inlet 141 is provided on the upper side of the square main body. In the square main body, there is provided a spray air pressure channel 150, and a spray air pressure inlet 151 is provided on the lower side of the square main body. In the square main body, there is provided a spray width air pressure channel 160, and a spray width air pressure inlet 161 is provided on the lower side of the square main body.

[0078] Refer to Figure 11 , the spray cover 200 is provided with an intermediate buffer cavity 210, a paint spray port 220, and a spray width angle 230. In the spray width angle 230, there are provided a spray width hole 231 and a rear inclined surface 233 of the spray width angle. A spray width opening 232 is provided on the spray width angle 230.

[0079] Refer to Figure 12 , the paint nozzle 300 includes an intermediate nozzle 310 and a side flow dividing ring 320. The side flow dividing ring 320 includes an inner flow dividing plate 321 and an outer flow dividing boss 323. A flow dividing hole 322 is provided on the inner flow dividing plate 321, and a front inclined surface 324 and a rear inclined surface 325 of the boss are provided on the outer flow dividing boss 323.

[0080] The thimble 400 passes through the thimble compression nut 410 and extends into the intermediate nozzle 310. On the thimble compression nut 410, there are provided a rear seal ring 411 of the thimble, a rear seal ring 412 of the compression nut, and a front U-shaped seal ring 420 of the thimble. On the front U-shaped seal ring 420 of the thimble, there are provided a first seal sleeve 421 and a second seal sleeve 422 of the thimble.

[0081] The rear end of the thimble 400 is connected to the thimble seat 510 through a thimble fixing nut 512. A thimble spring 520 is provided between the paint adjusting guide seat group 500 and the thimble seat 510. A guide seat seal ring 511 is provided on the thimble seat 510.

[0082] According to the low-pressure automatic spray gun of the embodiment of the present utility model, by setting it in this way, at least the following effects can be achieved. By connecting the air pressure inlet 141, the spray pattern air pressure inlet 151, and the spray width air pressure inlet 161 to independent air sources respectively, the control of the spray gun switch (CYL), atomization spray pattern (CAP), and spray width fan-shaped adjustment (FAN) can be realized. This is equivalent to independently controlling the pressure and flow rate of the spray width air pressure and the intermediate atomization air pressure. A very long spray width and a very thin atomized mist surface effect can be adjusted at low pressure, which can save paint and improve the spraying efficiency. The paint passage 130 is communicated with the outside through the paint inlet 131 and the paint outlet 132 to form a paint reflux cycle, which has the function of paint reflux, avoiding the formation of lumps and precipitation in the spray gun of the present utility model to form local blockages, ensuring the stability of the spray width shape of the sprayed paint mist, and the spraying effect is good enough. It is suitable for paints with high viscosity and easy precipitation.

[0083] In the description of this specification, the description with reference to terms such as "some embodiments" or "it is conceivable that" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expression of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0084] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A low-pressure automatic spray gun, characterized in that, Comprising: A gun body (100) having a paint channel (130), an opening and closing air pressure channel (140), a spray shape air pressure channel (150) and a spray width air pressure channel (160). An output cavity (110) is provided on the front side of the gun body (100), and an input cavity (120) is provided on the rear side of the gun body (100). The opening and closing air pressure channel (140) communicates with an opening and closing air pressure inlet (141) and the input cavity (120). The spray shape air pressure channel (150) communicates with a spray shape air pressure inlet (151) and the output cavity (110). The spray width air pressure channel (160) communicates with a spray width air pressure inlet (161) and the output cavity (110). A spray cover (200) is located on the output cavity (110). The spray cover (200) has an intermediate buffer cavity (210) and spray width holes (231) on the side. A paint spray nozzle (220) is provided on the intermediate buffer cavity (210). A paint nozzle (300) is located between the output cavity (110) and the spray cover (200). The paint nozzle (300) includes an intermediate nozzle (310). The front and rear ends of the intermediate nozzle (310) communicate with the paint spray nozzle (220) and the paint channel (130) respectively. A spray shape channel (111) and a spray width channel (112) are formed between the spray cover (200) and the output cavity (110). The spray shape channel (111) communicates with the spray shape air pressure channel (150), and the spray width channel (112) communicates with the spray width air pressure channel (160).

2. The low-pressure automatic spray gun according to claim 1, wherein A paint inlet (131), a paint outlet (132), an opening and closing air pressure inlet (141), a spray shape air pressure inlet (151) and a spray width air pressure inlet (161) are provided on the side wall of the gun body (100). The paint inlet (131) and the paint outlet (132) communicate with the paint channel (130). The paint inlet (131) and the paint outlet (132) are located on the left and right sides of the gun body (100). An intermediate nozzle installation cavity (133) is provided in the middle of the paint channel (130). The rear end of the intermediate nozzle (310) is connected to the intermediate nozzle installation cavity (133).

3. The low-pressure automatic spray gun according to claim 1 or 2, characterized in that, The opening and closing air pressure channel (140) is located on the upper side of the gun body (100), and the spray shape air pressure channel (150) and the spray width air pressure channel (160) are located on the lower side of the gun body (100).

4. The low-pressure automatic spray gun according to claim 1, characterized in that, A side flow dividing ring (320) is provided on the outer side wall of the intermediate nozzle (310), and flow dividing holes (322) are provided on the side flow dividing ring (320).

5. The low-pressure automatic spray gun according to claim 4, characterized in that, The side flow dividing ring (320) sequentially includes an inner flow dividing plate (321) and an outer flow dividing boss (323) from the inside to the outside. The flow dividing holes (322) are located on the inner flow dividing plate (321), and the outer flow dividing boss (323) is located between the spray width channel (112) and the spray width holes (231).

6. The low-pressure automatic spray gun according to claim 4, characterized in that, On the inner wall surface of the output cavity (110), there are provided a spray channel step surface (113), an output cavity partition step portion (114), and a spray width channel step surface (115). The output cavity partition step portion (114) is located between the spray channel step surface (113) and the spray width channel step surface (115). The output cavity partition step portion (114) can be connected to the side flow dividing ring (320) to separate the spray channel (111) from the spray width channel (112). On the spray channel step surface (113), there is a spray air pressure outlet (152) communicating with the spray air pressure channel (150) and the spray channel (111). On the spray width channel step surface (115), there is a spray width air pressure outlet (162) communicating with the spray width air pressure channel (160) and the spray width channel (112).

7. The low-pressure automatic spray gun according to claim 6, characterized in that, On the output cavity partition step portion (114), there is provided a recessed buffer position (116). The spray air flow output from the spray air pressure outlet (152) enters the spray channel (111) after passing through the recessed buffer position (116).

8. The low-pressure automatic spray gun according to claim 2, characterized in that, A paint hole plug (600) is provided on the paint outlet (132).

9. The low-pressure automatic spray gun according to claim 1, wherein A thimble tightening nut (410) is provided between the paint channel (130) and the input cavity (120). The thimble (400) sequentially passes through the input cavity (120), the thimble tightening nut (410), and the intermediate nozzle (310). The front end of the thimble (400) extends to the front end position of the intermediate nozzle (310).

10. The low-pressure automatic spray gun according to claim 9, characterized in that, A paint adjustment guide seat group (500) and a thimble seat (510) are provided on the input cavity (120). A thimble spring (520) is provided between the paint adjustment guide seat group (500) and the thimble seat (510). The thimble seat (510) is connected to the rear end position of the thimble (400).

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