Spray gun and spray device

Abstract

The utility model relates to a spraying device technical field, concretely is a kind of spray gun and spraying device, spray gun includes gun body, movable cavity, cylinder, movable cavity is equipped with mixing chamber in;The front and rear ends of mixing chamber are slidably and sealingly connected with movable cavity, and the middle part is slidably and sealingly connected with feed chamber;Clean fluid cavity is equipped between the middle part of mixing chamber and movable cavity, and clean fluid passage is equipped in gun body and is communicated with clean fluid cavity;Feed chamber is equipped with feed passage;Cylinder can drive mixing chamber to move forward and backward to make two mixing chamber inlets align with feed passage or be communicated with clean fluid cavity;Gun body is further provided with cylinder gas passage one and cylinder gas passage two, which are communicated with the inside of cylinder body of cylinder;Gun body is further provided with communication passage, which is communicated with cylinder gas passage one and clean fluid passage;The utility model can realize "cleaning liquid flushing cleaning and gas purging cleaning" to the inside of spray gun, and can realize the automatic opening and closing of "gas purging cleaning".

Description

Technical Field

[0001] This utility model relates to the field of spraying equipment technology, specifically a spray gun and spraying device. Background Technology

[0002] Two-component spray guns are used for spraying two-component materials such as polyurethane and polyurea. The two components of the two-component material are mixed inside the spray gun before being sprayed out. Patent application number 202422543847.6 discloses a polyurethane spray gun. By setting up a liquid inlet pipe and an air inlet pipe, after the spray gun stops spraying, the cleaning liquid control valve is first opened to introduce high-pressure cleaning liquid into the mixing chamber inside the spray gun for cleaning. Then the cleaning liquid control valve is closed, the gas control valve is opened, and compressed air is introduced to blow out the residual cleaning liquid. In addition to the cleaning liquid pipeline and cleaning liquid control valve, the cleaning mechanism of this spray gun also requires an additional purge gas pipeline and purge gas control valve, which makes the structure complex and the control cumbersome.

[0003] How to simplify the structure and control method of the cleaning mechanism of the two-component spray gun is a problem that needs to be solved in the existing technology. Utility Model Content

[0004] The main objective of this invention is to provide a spray gun and spraying device to solve the problem of how to simplify the structure and control method of the cleaning mechanism of a two-component spray gun in the prior art.

[0005] To achieve the above objectives, this utility model provides a spray gun, including a gun body. The gun body contains a movable chamber, feeding chambers located on the left and right sides of the movable chamber, and a cylinder located at the rear of the movable chamber. The movable chamber contains a mixing chamber, which includes a mixing chamber outlet and two mixing chamber inlets. The front and rear ends of the mixing chamber are slidably and sealed to the movable chamber, and the middle part is slidably and sealed to the feeding chamber. A cleaning fluid chamber is provided between the middle of the mixing chamber and the movable chamber, and the gun body contains a cleaning fluid channel communicating with the cleaning fluid chamber. A feeding channel is provided in the feeding chamber. The cylinder can drive the mixing chamber to move back and forth, aligning and connecting the two mixing chamber inlets with the feeding channel or with the cleaning fluid chamber. The gun body contains a cylinder gas channel one and a cylinder gas channel two communicating with the inside of the cylinder body. The gun body also contains a connecting channel connecting cylinder gas channel one and the cleaning fluid channel.

[0006] Furthermore, cylinder gas channel one is the cylinder's air intake channel when controlling the connection between the two mixing chamber inlets and the clean fluid chamber; cylinder gas channel two is the cylinder's air intake channel when controlling the connection between the two mixing chamber inlets and the feed channel.

[0007] Furthermore, the gun body is provided with a three-way cavity and a cleaning fluid channel; the two ends of the three-way cavity are respectively provided with three-way cavity interface one and three-way cavity interface two, and three-way cavity interface three is provided in the middle; three-way cavity interface one is connected to the communication channel, three-way cavity interface two is connected to the cleaning fluid channel, and three-way cavity interface three is connected to the cleaning fluid channel; a plug ball is movably connected in the three-way cavity, and the plug ball can move under the propulsion of the fluid, and can move to one of the three-way cavity interfaces to block the three-way cavity interface and connect three-way cavity interface two and three-way cavity interface three, or move to three-way cavity interface two to block the three-way cavity interface two and connect three-way cavity interface one and three-way cavity interface three.

[0008] Furthermore, the gun body is fixedly connected to a material pipe, which is connected to the feed channel; the cylinder gas channel one and the cylinder gas channel two are respectively connected to air pipes; and the cleaning fluid channel is connected to a cleaning fluid pipe.

[0009] This utility model also provides a spraying device, including a rotary joint, a motor and the above-mentioned spray gun. The rotary joint includes an inner rotating body and an outer rotating body. The top end of the inner rotating body is connected to a material pipe, an air pipe and a cleaning liquid pipe, and the bottom end is connected to the output shaft of the motor. The top end of the inner rotating body is fixedly connected to the gun body through a bracket.

[0010] Furthermore, the rotary joint is provided with at least 5 rotary joint channels. Each rotary joint channel includes an inner joint channel located in the inner rotating body and an annular outer joint channel located inside the outer rotating body and always connected to the inner joint channel. The inner joint channel is provided with a channel outlet connected to the outside of the inner rotating body, and the outer joint channel is provided with a channel inlet connected to the outside of the outer rotating body. The channel outlets are respectively connected to the material pipe, the air pipe, and the cleaning liquid pipe.

[0011] Furthermore, both cylinder gas passage one and cylinder gas passage two are equipped with three gas ports that communicate with the outside of the gun body. The three gas ports are located on the left, right and rear sides of the gun body, respectively. One gas port is connected to the gas pipe, and the other two gas ports are connected to plugs.

[0012] This invention connects the cylinder gas passage to the cleaning fluid passage by setting up a communication channel, thereby introducing the gas supplied to the cylinder into the cleaning fluid passage for "gas purging and cleaning", thus eliminating the need for an additional gas supply pipe and simplifying the structure of the spray gun.

[0013] This invention, by setting up a cleaning fluid channel, enables "cleaning with cleaning fluid and cleaning with air purging" inside the spray gun. Since both the cleaning fluid and the sprayed material are liquid, the cleaning process with the cleaning fluid is closer to the flow process of liquid materials, so the cleaning of residual liquid materials and accumulations is more thorough, ensuring a good cleaning effect and preventing residual materials from adhering to the nozzle. The introduction of pressurized air can prevent residual cleaning fluid from reacting chemically with the sprayed material, thus avoiding affecting the use effect of the sprayed material.

[0014] This invention, by setting a three-way cavity and a stopper ball, and controlling the pressure of the cleaning fluid to be greater than that of the compressed gas, can realize the automatic opening and closing of "gas purging cleaning" without the need for separate control; only the opening and closing of the cleaning fluid needs to be controlled separately, thus simplifying the control method.

[0015] This invention features three ports located on the left, right, and rear sides of the spray gun, allowing users to select the appropriate port location for different usage scenarios, thus facilitating connection between the ports and the air hose. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0017] Figure 1 This is a schematic diagram of the spray gun structure in the embodiment; Figure 2 This is a schematic diagram of the cross-sectional structure of the mixing chamber in the embodiment; Figure 3 This is a top view of the spray gun in the embodiment; Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at the CC position; Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure at point DD; Figure 6 for Figure 3 Schematic diagram of the cross-sectional structure at the middle EE; Figure 7 for Figure 3 Schematic diagram of the cross-sectional structure at point AA; Figure 8 This is a schematic diagram of the cross-sectional structure at the material block in the embodiment; Figure 9 This is a schematic diagram of the spraying device in the embodiment; Figure 10 This is a cross-sectional view of the rotary joint in the embodiment; Figure 11 This is a schematic diagram of the interface structure in the embodiment; In the diagram: 1. Gun body; 101. Movable chamber; 102. Feed chamber; 102a. Feed channel; 102b. Friction pair; 102c. Spring; 103. Cleaning fluid chamber; 104. Cylinder gas channel one; 105. Cylinder gas channel two; 106. Cleaning fluid channel; 107. Communication channel; 108. Gas interface; 109. Cleaning fluid channel; 1010. Three-way chamber; 1010a. Three-way chamber interface one; 1010b, Three-way cavity interface two; 1010c, Three-way cavity interface three; 2, Cylinder; 3, Mixing chamber; 301, Mixing cavity; 302, Mixing cavity inlet; 303, Mixing cavity outlet; 4, Plug ball; 5, Support; 6, Material block; 601, Material block channel; 7, Material pipe; 8, Rotary joint; 801, Inner rotating body; 802, Outer rotating body; 9, Air pipe; 10, Plug; 11, Motor; 12, Cleaning liquid pipe. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] Example 1 like Figures 1 to 7 As shown, according to an embodiment of the present invention, a spray gun is provided, including a gun body 1. The gun body 1 has a movable cavity 101, feeding chambers 102 located on the left and right sides of the movable cavity 101, and a cylinder 2 located on the rear side of the movable cavity 101. The movable cavity 101 has a mixing chamber 3, which has a mixing chamber 301, a mixing chamber outlet 303 located at the front end of the mixing chamber 301, and two mixing chamber inlets 302 located on the front and rear sides of the rear end of the mixing chamber 301. The front and rear ends of the mixing chamber 3 are slidably and sealingly connected to the movable cavity 101, and the middle part is slidably and sealingly connected to the feeding chamber 102. The middle part of the mixing chamber 3... A cleaning fluid chamber 103 is provided between the active chamber 101 and the cleaning fluid chamber 103. A cleaning fluid channel 106 communicating with the cleaning fluid chamber 103 is provided inside the gun body 1. A feeding channel 102a is provided inside the feeding chamber 102. The cylinder 2 can drive the mixing chamber 3 to move back and forth so that the two mixing chamber inlets 302 are aligned and connected with the feeding channel 102a or connected with the cleaning fluid chamber 103. A cylinder gas channel one 104 and a cylinder gas channel two 105 communicating with the inside of the cylinder body of the cylinder 2 are provided inside the gun body 1. A connecting channel 107 communicating with the cylinder gas channel one 104 and the cleaning fluid channel 106 is also provided inside the gun body 1.

[0020] The feeding chamber 102 is equipped with a movable friction pair 102b and a spring 102c. The friction pair 102b is pressed against the side wall of the mixing chamber 3 under the elastic force of the spring 102c, forming a sliding sealing connection.

[0021] like Figure 2 , Figure 4 and Figure 6 As shown, cylinder gas channel one 104 is the air intake channel of cylinder 2 when controlling the two mixing chamber inlets 302 to be connected to the clean fluid chamber 103; cylinder gas channel two 105 is the air intake channel of cylinder 2 when controlling the two mixing chamber inlets 302 to be aligned and connected to the feed channel 102a.

[0022] When gas enters cylinder 2 from gas passage 104, cylinder 2 drives mixing chamber 3 to extend forward, so that the two mixing chamber inlets 302 are connected to the clean fluid chamber 103, and the connection with the feed passage 102a is blocked; when gas enters cylinder 2 from gas passage 105, cylinder 2 drives mixing chamber 3 to retract backward, so that the two mixing chamber inlets 302 are aligned and connected to the feed passage 102a, and the connection with the clean fluid chamber 103 is blocked.

[0023] This embodiment connects the cylinder gas channel to the cleaning fluid channel by setting up a communication channel, thereby introducing the gas supplied to the cylinder into the cleaning fluid channel for "gas purging cleaning", thus eliminating the need for an additional gas supply pipe and simplifying the structure of the spray gun.

[0024] Example 2 Example 2 also provides a spray gun, which differs from the spray gun in Example 1 only in that: like Figure 7 As shown, the gun body 1 has a three-way cavity 1010 and a cleaning fluid channel 109. The three-way cavity 1010 has a three-way cavity interface 1010a and a three-way cavity interface 1010b at its two ends, and a three-way cavity interface 1010c in the middle. The three-way cavity 1010 is a cylindrical cavity with an inner diameter of 6.1 mm and a length of 12 mm. The three-way cavity interfaces 1010a and 1010b are circular openings with a diameter of 3.2 mm, coaxial with the three-way cavity 1010. The three-way cavity interface 1010c is a circular opening with a diameter of 2.8 mm, located directly above the middle of the three-way cavity 1010. The three-way cavity interface 1010a is connected to a communication device. Channel 107, three-way cavity interface 2 1010b connects to cleaning fluid channel 109, three-way cavity interface 3 1010c connects to cleaning fluid channel 106; a stopper ball 4 is movably connected inside the three-way cavity 1010, the stopper ball 4 has a diameter of 6mm, the stopper ball 4 can move under the propulsion of the fluid, can move to the three-way cavity interface 1010a to block the three-way cavity interface 1010a and connect the three-way cavity interface 2 1010b and the three-way cavity interface 3 1010c, or move to the three-way cavity interface 2 1010b to block the three-way cavity interface 2 1010b and connect the three-way cavity interface 1010a and the three-way cavity interface 3 1010c.

[0025] When the fluid pressure at the three-way cavity interface 1010a is greater than the fluid pressure at the three-way cavity interface 2010b, the plug ball 4 moves toward the three-way cavity interface 2010b, blocking the three-way cavity interface 2010b, and the three-way cavity interface 1010a and the three-way cavity interface 3010c are connected; when the fluid pressure at the three-way cavity interface 2010b is greater than the fluid pressure at the three-way cavity interface 1010a, the plug ball 4 moves toward the three-way cavity interface 1010a, blocking the three-way cavity interface 1010a, and the three-way cavity interface 2010b and the three-way cavity interface 3010c are connected.

[0026] like Figure 1 and Figure 8 As shown, the gun body 1 is fixedly connected to two material pipes 7 via a material block 6. The material block 6 has two material block channels 601. The two material pipes 7 are respectively connected to the feeding channels 102a in the two feeding chambers 102 via the two material block channels 601. The cylinder gas channel one 104 and the cylinder gas channel two 105 are respectively connected to air pipes 9. The cleaning fluid channel 109 is connected to the cleaning fluid pipe 12. Figure 8 The direction of the middle arrow indicates the direction of material flow.

[0027] Example 3 A cleaning method for a spray gun according to Embodiment 2 includes the following steps: S1. During normal spraying, no cleaning is required. Specifically: Compressed gas enters the cylinder gas passage 105 and then enters the cylinder 2. The gas in the cylinder 2 is discharged from the cylinder gas passage 104. After the gas enters the cylinder 2, the cylinder 2 drives the mixing chamber 3 to move. The two mixing chamber inlets 302 are aligned and connected with the feed channel 102a, and are blocked and cut off from the clean fluid chamber 103. S2. When the spray gun is paused, the gas is purged and cleaned, specifically as follows: Compressed gas enters the cylinder gas passage 104, then part of it enters the cylinder 2, and the other part enters the three-way chamber 1010 through the connecting passage 107. The gas in the cylinder 2 is discharged from the cylinder gas passage 105. After the gas enters the cylinder 2, the cylinder 2 drives the mixing chamber 3 to move; the two mixing chamber inlets 302 are connected to the cleaning fluid chamber 103, and are blocked from the feed channel 102a; the spray gun stops spraying. After the gas enters the three-way cavity 1010, it pushes the plug ball 4 to move to the three-way cavity interface 2 1010b to block the three-way cavity interface 2 1010b and connect the three-way cavity interface 1010a and the three-way cavity interface 3 1010c; the gas enters the cleaning fluid channel 106, then enters the cleaning fluid cavity 103, and finally enters the mixing cavity 301 through the mixing cavity inlet 302, blowing out the residual material in the mixing cavity 301 from the mixing cavity outlet 303; S3. After spraying is completed and the spray gun stops spraying, perform cleaning with cleaning solution and air purging, specifically as follows: Pressurized cleaning fluid is introduced into the cleaning fluid channel 109 through the cleaning fluid tube 12. The pressure of the cleaning fluid is greater than the pressure of the compressed gas in the air tube 9. The cleaning fluid enters the three-way cavity 1010 through the cleaning fluid channel 109, pushing the stopper 4 to move to the three-way cavity interface 1010a to block the three-way cavity interface 1010a and connect the three-way cavity interface 2 1010b and the three-way cavity interface 3 1010c. The cleaning fluid enters the cleaning fluid channel 106, then enters the cleaning fluid cavity 103, and finally enters the mixing cavity 301 through the mixing cavity inlet 302 to flush and clean the mixing cavity 301. After rinsing and cleaning for a period of time, the cleaning fluid pipe 12 stops supplying cleaning fluid into the cleaning fluid channel 109, and the pressure of the cleaning fluid is relieved. The pressure of the cleaning fluid at the three-way cavity interface 2 1010b is less than the pressure of the compressed gas at the three-way cavity interface 1010a. The plug ball 4 is pushed to the three-way cavity interface 2 1010b to block the three-way cavity interface 2 1010b and connect the three-way cavity interface 1010a with the three-way cavity interface 3 1010c. The gas enters the cleaning fluid channel 106, then enters the cleaning fluid cavity 103, and finally enters the mixing cavity 301 through the mixing cavity inlet 302, blowing out the cleaning fluid in the cleaning fluid channel 106, the cleaning fluid cavity 103 and the mixing cavity 301.

[0028] In step S3, when performing cleaning with cleaning fluid and gas purging, the spray gun should be kept away from the sprayed surface to avoid the cleaning fluid from spraying onto the sprayed surface and contaminating it.

[0029] In Examples 2 and 3, by setting up a cleaning fluid channel, "cleaning with cleaning fluid and cleaning with air blowing" can be achieved inside the spray gun. Since both the cleaning fluid and the sprayed material are liquid, the cleaning process with the cleaning fluid is closer to the flow process of liquid materials. Therefore, the cleaning of residual liquid materials and accumulations will be more thorough, ensuring a good cleaning effect and preventing residual materials from adhering to the nozzle. The introduction of pressurized air can prevent residual cleaning fluid and sprayed materials from reacting chemically, thus avoiding affecting the performance of the sprayed materials.

[0030] In Examples 2 and 3, by setting up a three-way cavity and a stopper ball, and controlling the pressure of the cleaning fluid to be greater than that of the compressed gas, the automatic opening and closing of "gas purging cleaning" can be achieved without separate control; only the opening and closing of the cleaning fluid needs to be controlled separately, thus simplifying the control method.

[0031] Example 4 like Figure 8-10 As shown, a spraying device includes a rotary joint 8, a motor 11, and the spray gun in Embodiment 2. The rotary joint 8 includes an inner rotating body 801 and an outer rotating body 802. The top end of the inner rotating body 801 is connected to the material pipe 7, the air pipe 9, and the cleaning liquid pipe 12, and the bottom end is connected to the output shaft of the motor 11. The top end of the inner rotating body 801 is fixedly connected to the gun body 1 through a bracket 5. The outer rotating body 802 is fixedly connected to the outer wall of the motor 11 through a fixing bracket. When the spraying device is working, the outer rotating body 802 is fixed, and the output shaft of the motor 11 drives the inner rotating body 801 and the spray gun to rotate.

[0032] The rotary joint 8 is provided with 5 rotary joint channels, two of which are used to convey spraying materials, two of which are used to convey gas, and one of which is used to convey cleaning fluid. Each rotary joint channel includes an inner joint channel 801a located in the inner rotating body 801 and an annular outer joint channel 802a located inside the outer rotating body 802 and always connected to the inner joint channel 801a. The inner joint channel 801a is provided with a channel outlet 801b that communicates with the outside of the inner rotating body 801, and the outer joint channel 802a is provided with a channel inlet 802b that communicates with the outside of the outer rotating body 802.

[0033] Figure 10 The arrows indicate the direction of fluid flow. The fluid first enters the outer connector channel 802a from the channel inlet 802b on the outer rotating body 802, then enters the inner connector channel 801a, and finally exits through the channel outlet 801b at the top of the inner rotating body 801. The rotation of the inner rotating body 801 does not affect the flow of fluid. The five channel inlets 802b at the top of the inner rotating body 801 are connected to two material pipes 7, two air pipes 9 and one cleaning liquid pipe 12, respectively.

[0034] The five channel inlets 802b on the outer rotating body 802 are respectively connected to two material inlet pipes, two air inlet pipes, and one and one cleaning liquid inlet pipe; a booster pump for pressurizing the cleaning liquid is connected to the cleaning liquid inlet pipe.

[0035] like Figure 11As shown, both the cylinder gas passage 104 and the cylinder gas passage 2 are provided with three gas ports 108 that communicate with the outside of the gun body 1. The three gas ports 108 are located on the left, right and rear sides of the gun body 1, respectively. One gas port 108 is connected to the gas pipe 9, and the other two gas ports 108 are connected to plugs 10.

[0036] By setting three interfaces located on the left, right, and rear sides of the spray gun, different interface positions can be selected according to different usage scenarios, making it convenient to connect the interfaces to the air hose.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A spray gun, comprising a gun body (1), wherein the gun body (1) is provided with a movable chamber (101), feeding chambers (102) located on the left and right sides of the movable chamber (101), and a cylinder (2) located on the rear side of the movable chamber (101); a mixing chamber (3) is provided in the movable chamber (101), wherein the mixing chamber (3) is provided with a mixing chamber (301), a mixing chamber outlet (303), and two mixing chamber inlets (302); the front and rear ends of the mixing chamber (3) are slidably sealed to the movable chamber (101), and the middle part is slidably sealed to the feeding chamber (102); the middle part of the mixing chamber (3) is slidably sealed to the movable chamber (101). A cleaning fluid chamber (103) is provided between the moving chamber (101), and a cleaning fluid channel (106) communicating with the cleaning fluid chamber (103) is provided inside the gun body (1); a feeding channel (102a) is provided inside the feeding chamber (102); the cylinder (2) can drive the mixing chamber (3) to move back and forth so that the inlets (302) of the two mixing chambers are aligned and connected with the feeding channel (102a) or connected with the cleaning fluid chamber (103); the gun body (1) is provided with a cylinder gas channel one (104) and a cylinder gas channel two (105) communicating with the inside of the cylinder body (2); characterized in that, The gun body (1) is also provided with a communication channel (107) that connects the cylinder gas channel (104) and the cleaning fluid channel (106).

2. The spray gun as described in claim 1, characterized in that, The first cylinder gas channel (104) is the air intake channel of the cylinder (2) when the two mixing chamber inlets (302) are connected to the clean fluid chamber (103); the second cylinder gas channel (105) is the air intake channel of the cylinder (2) when the two mixing chamber inlets (302) are aligned and connected to the feed channel (102a).

3. The spray gun as described in claim 2, characterized in that, The gun body (1) is provided with a three-way cavity (1010) and a cleaning fluid channel (109); the two ends of the three-way cavity (1010) are respectively provided with a three-way cavity interface one (1010a) and a three-way cavity interface two (1010b), and a three-way cavity interface three (1010c) is provided in the middle; the three-way cavity interface one (1010a) is connected to the communication channel (107), the three-way cavity interface two (1010b) is connected to the cleaning fluid channel (109), and the three-way cavity interface three (1010c) is connected to the cleaning fluid channel (106); A stopper ball (4) is movably connected inside the three-way cavity (1010). The stopper ball (4) can move under the propulsion of the fluid. It can move to the first three-way cavity interface (1010a) to block the first three-way cavity interface (1010a) and connect the second three-way cavity interface (1010b) and the third three-way cavity interface (1010c), or move to the second three-way cavity interface (1010b) to block the second three-way cavity interface (1010b) and connect the first three-way cavity interface (1010a) and the third three-way cavity interface (1010c).

4. The spray gun as described in claim 3, characterized in that, The gun body (1) is fixedly connected to a material pipe (7), which is connected to the feed channel (102a); the cylinder gas channel one (104) and the cylinder gas channel two (105) are respectively connected to air pipes (9); the cleaning liquid channel (109) is connected to a cleaning liquid pipe (12).

5. A spraying device, comprising a rotary joint (8), a motor (11), and the spray gun as described in claim 4, characterized in that, The rotary joint (8) includes an inner rotating body (801) and an outer rotating body (802). The top end of the inner rotating body (801) is connected to the material pipe (7), the air pipe (9), and the cleaning liquid pipe (12), and the bottom end is connected to the output shaft of the motor (11). The top end of the inner rotating body (801) is fixedly connected to the gun body (1) through the bracket (5).

6. The spraying apparatus as described in claim 5, characterized in that, The rotary joint (8) is provided with at least 5 rotary joint channels. Each rotary joint channel includes an inner joint channel (801a) located in the inner rotating body (801) and an annular outer joint channel (802a) located inside the outer rotating body (802) and always connected to the inner joint channel (801a). The inner joint channel (801a) is provided with a channel outlet (801b) connected to the outside of the inner rotating body (801), and the outer joint channel (802a) is provided with a channel inlet (802b) connected to the outside of the outer rotating body (802). The channel outlet (801b) is connected to the material pipe (7), the air pipe (9), and the cleaning liquid pipe (12), respectively.

7. The spraying apparatus as described in claim 5, characterized in that, Both the cylinder gas passage one (104) and the cylinder gas passage two (105) are provided with three gas ports (108) that communicate with the outside of the gun body (1). The three gas ports (108) are located on the left, right and rear sides of the gun body (1), respectively. One gas port (108) is connected to the air pipe (9), and the other two gas ports (108) are connected to plugs (10).

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