A double linkage paint spray gun

Abstract

The present invention relates to the field of spraying equipment, in particular to a double-link paint spray gun. Existing paint spray guns have the problems of being troublesome to operate with both hands, high requirements for getting started, unreasonable atomization structure, poor paint atomization effect, low utilization and waste, etc. The present invention provides a double-link paint spray gun, including a barrel, a nozzle, a gun handle and a trigger. The nozzle is arranged at the front end of the barrel, and a hole is opened at the front end of the nozzle to form a nozzle. The barrel is provided with an air supply channel and a material supply channel, and the gun handle is provided with an air intake channel connected to the air supply channel. The barrel and the gun handle are respectively provided with a discharge assembly and an air intake assembly for controlling the opening and closing of the material supply channel and the air intake channel, and the trigger can simultaneously control the discharge assembly and the air intake assembly to synchronously open and close the corresponding channels. The double-link paint spray gun described in the present invention only needs to be operated with one hand, and can easily and synchronously adjust the supply and mixing of paint and compressed air; the atomization structure is reasonable, the compressed air and paint are evenly atomized, the spraying effect is good, the paint splashes less, and the paint utilization rate is high.

Description

Technical Field

[0001] The invention relates to the field of spraying equipment, in particular to a double-linkage paint spray gun. Background Art

[0002] Common wall painting is mostly done by manual scraping or machine spraying, among which machine spraying requires the use of a paint spray gun. Existing paint spray guns include a spray gun body, which is provided with an air supply channel for connecting to the paint and a material supply channel for connecting to a compressed air supply source. A nozzle is provided at the front end of the paint spray gun, and compressed air and paint are mixed and sprayed out from the nozzle. Existing paint spray guns have the following problems: 1. Workers need to use both hands to operate, and both hands control the air intake and feed respectively, which is inconvenient for workers to operate; 2. The atomization structure is not reasonable, and the compressed air sprayed axially outward from the center of the nozzle cavity has an uneven atomization effect on the paint. The impact force is large during spraying, the paint splashes seriously, the paint utilization rate is low and the waste is large, and the expected spraying effect cannot be achieved. Summary of the invention

[0003] The technical problem to be solved and the technical task proposed by the present invention are to overcome the problems of existing paint spray guns, such as troublesome two-handed operation, high requirements for operation, unreasonable atomization structure, poor paint atomization effect, low utilization rate and waste. The present invention provides a double-linkage paint spray gun, which only needs to be operated with one hand, and can easily and synchronously adjust the paint and compressed air supply and mixing; the atomization structure is reasonable, the compressed air and paint are evenly atomized, the spraying effect is good, there is less paint splashing, and the paint utilization rate is high.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows: a double-link paint spray gun comprises a gun barrel, a nozzle, a gun handle and a trigger, wherein the nozzle is arranged at the front end of the gun barrel, a hole is opened at the front end of the nozzle to form a nozzle, an air delivery channel and a material delivery channel are arranged in the gun barrel, and the two channels are connected to the inner cavity of the nozzle, the gun handle is connected to the rear part of the gun barrel, and the trigger is movably connected to the gun barrel at the front side of the gun handle, and is characterized in that an air intake channel is arranged in the gun handle, the upper end of the air intake channel is connected to the air delivery channel, and the lower end is connected to the air intake port arranged at the bottom of the gun handle to connect to the air source, and the material delivery channel is arranged The gun barrel and the gun handle are respectively provided with a discharge assembly and an air intake assembly for controlling the opening and closing of the feed channel and the air intake channel, and the trigger can simultaneously control the discharge assembly and the air intake assembly to synchronously open and close the corresponding channels. The present invention can be operated with one hand. The trigger is pressed to control the synchronous opening and closing of the material feeding channel and the air inlet channel to achieve the coordination of air inlet and material feeding. The air supply and material feeding can be opened or closed at the same time. The operation is simple and easy to use. The atomization structure is more reasonable, and the paint atomization effect is more uniform. The center of the nozzle cavity supplies paint, and the air outlet channel surrounding the side wall supplies compressed air. The compressed air surrounds the paint, and the two are mixed more evenly. There is less paint splashing during spraying, and the paint utilization rate is improved. The air inlet at the bottom of the gun handle and the feed port on the butt can be connected to the air supply source and the feed source for continuous air supply and material feeding, so that the paint spray gun can work continuously for a long time.

[0005] As a further improvement and supplement to the above technical scheme, the present invention adopts the following technical measures: the discharge assembly includes a first gun needle, an adjusting nut connected to a trigger and a first gun needle spring, the front part of the first gun needle seals and penetrates into the axial channel and can move along the axial direction of the gun barrel to open and close the axial channel and the nozzle joint, the rear part of the first gun needle passes through the adjusting nut and then penetrates into the gun handle and a tail sleeve is set at the end to resist the first gun needle spring, the adjusting nut is screwed on the first gun needle through a thread, and the first gun needle is provided with a matching external thread at the joint part with the adjusting nut, the first gun needle spring is limited in the gun needle channel provided in the gun handle and elastically pushes the first gun needle forward; the air intake assembly includes a second gun needle and a second gun needle spring, the rear part of the second gun needle seals and penetrates into the air intake channel on the gun handle and can move along the axial direction of the gun barrel to open and close the air intake channel, the front part of the second gun needle extends out of the gun handle and resists the trigger forward, the second gun needle spring is limited in the air intake channel and elastically pushes the second gun needle forward, and the second gun needle spring is located below the first gun needle spring. Pulling the trigger can drive the first gun needle and the second gun needle to move synchronously to open the corresponding channel, and the air supply and material supply are opened at the same time. When the trigger is released, the two gun needles are pushed back by their respective gun needle springs, and the air supply and material supply are closed at the same time; the two gun needles are sealed and penetrated into the axial channel and the air inlet channel respectively to ensure that there is no leakage when the gun needles are active. When working, the trigger is pulled to drive the adjustment nut to drive the first gun needle to retreat and compress the first gun needle spring, and open the material delivery channel to supply material to the nozzle. After releasing the trigger, the first gun needle spring resets and pushes the first gun needle back to its position, closes the material delivery channel to supply material to the nozzle, and the trigger also returns to its position; the adjustment nut and the first gun needle are screwed together, which is convenient for adjustment so that the first gun needle and the trigger are in place; when the trigger is pulled, the second gun needle is pushed back synchronously and the second gun needle spring is compressed, and the air inlet channel is opened to supply air to the air delivery channel. After releasing the trigger, the second gun needle spring resets and pushes the second gun needle back to its position, and the air inlet channel is closed to supply air to the air delivery channel.

[0006] The gun needle channel is formed by connecting a mounting channel that runs through the gun handle horizontally and a sleeve sleeved at the front of the channel. The front of the mounting channel passes through the air inlet channel. The outer wall of the sleeve is provided with an inwardly concave annular groove at a position that coincides with the air inlet channel. The axial length of the annular groove is greater than the cross-sectional size of the air inlet channel at the coincident position, so that an annular gap exists between the air inlet channel and the outer wall of the sleeve at the coincident position. The outer diameter of the sleeve on both sides of the annular groove matches the inner diameter of the mounting channel for sealing. The rear end of the mounting channel is open and a first tail cover is provided for sealing. The first gun needle spring is pressed backward against a first tail cover; the air intake passage below the first gun needle spring comprises a horizontally extending transverse air intake passage, the front portion of the transverse air intake passage is connected to the air intake passage extending upward, the rear portion is connected to the air intake passage extending downward and a reducing hole is arranged at the turning point, the transverse air intake passage extends backward through the gun handle and is sealed with a second tail cover, the rear portion of the second gun needle seals and penetrates into the transverse air intake passage, the rear end of the second gun needle forms a sealing end matching the reducing hole, the second gun needle spring is arranged in the transverse air intake passage and the two ends respectively abut against the sealing end and the second tail cover. The gun needle channel is formed by the connection of the installation channel and the sleeve, wherein the installation channel uses a built-in sleeve at the overlap position of the air inlet channel to achieve that the first gun needle movement and air intake do not affect each other, and when the compressed air reaches the overlap position, it passes through the annular gap between the annular groove on the outer wall of the sleeve and the air inlet channel to ensure smooth gas transmission, and the outer diameter of the sleeve on both sides of the annular groove and the sealing of the installation channel ensure that the gas in the annular gap does not leak, the rear part of the first gun needle moves and translates in the inner cavity of the sleeve and the installation channel, and the rear end of the installation channel is open and a first tail cover is provided to seal it. The first limit gun needle spring is installed; the transverse air intake channel is used to install the second gun needle spring, and the rear seal of the second gun needle penetrates into the transverse air intake channel to ensure that the second gun needle will not leak when it moves. At the same time, the second gun needle cooperates with the sealing end and the reducing hole thereon to open and close the air intake channel. When the sealing end is close to the reducing hole, the air intake channel is closed, and when the sealing end leaves the reducing hole, the air intake channel is opened; the transverse air intake channel runs through the gun handle backwards and is sealed with a second tail cover to facilitate the installation of the second gun needle spring, so that the second gun needle spring can elastically push the second gun needle.

[0007] A convex column is arranged on the end surface of the sealing end, and one end of the second needle spring is sleeved on the convex column to abut against the sealing end. The function of the convex column is to limit one end of the second needle spring sleeved thereon, to ensure that the second needle spring directly abuts against the second needle, to avoid the spring not being aligned with the second needle and affecting its elastic reset.

[0008] The variable diameter hole is in a tapered shape with a large outside and a small inside. The tapered hole and the sealing end of the corresponding shape fit well with each other and have good sealing performance. When the sealing end is close to the tapered hole, the two can be guided to align and fit through the change of the aperture. The front end of the tapered hole corresponds to the trigger side with a small aperture, and the rear end corresponds to the second tail cover side with a large aperture.

[0009] A sealing sleeve is sleeved in the transverse air intake passage, and the front and rear parts of the sealing sleeve are both sealed and connected to the transverse air intake passage. A hollow tube cavity extending along the length direction and opened at both ends is provided in the center of the sealing sleeve, and a second gun needle is passed through the hollow tube cavity at the front part of the sealing sleeve and is sealed and connected to the second gun needle, and the corresponding tube cavity at the rear part of the sealing sleeve and the second gun needle are gap-matched. The middle slotted hole of the sealing sleeve connects the tube cavity and the air intake passage extending upward at the front part of the transverse air intake passage, and the reducing hole is provided at the rear end opening of the sealing sleeve and connects and connects to the air intake passage extending downward at the rear part of the transverse air intake passage. The sealing sleeve is used to penetrate and install the second gun needle, wherein the front and rear of the sealing sleeve are sealedly connected to the transverse air inlet channel, and only the slot hole in the middle connects the tube cavity of the sealing sleeve with the two sections of the air inlet channel that are connected to the front and rear of the transverse air inlet channel to form an air supply channel. When the sealing end of the second gun needle is close to the reducing hole, the air supply channel is closed, and when the sealing end leaves the reducing hole, the air supply channel is opened; the corresponding tube cavity at the front of the sealing sleeve is sealedly connected to the second gun needle to prevent air leakage when the gun needle moves, and the corresponding tube cavity at the rear of the sealing sleeve is matched with the gap of the second gun needle, so that compressed air can pass through the gap and be delivered from the slot hole through the tube cavity.

[0010] The aperture of the rear end opening of the nozzle shrinks from outside to inside, and the front end of the first gun needle is an arc end, which is larger than the small diameter end of the rear end opening of the nozzle. The rear end opening of the nozzle is a variable diameter hole, and the aperture gradually decreases from outside to inside. At the same time, the front end of the first gun needle is in an arc shape and is larger than the small diameter end of the aforementioned variable diameter hole. When the arc end cooperates with the rear end opening of the nozzle, the two have better sealing performance.

[0011] The axial channel and the gas delivery channel extend forward to the front end face of the gun barrel and form a first opening and a second opening respectively. The nozzle is fastened to the front end of the gun barrel through a top sleeve, and the rear of the nozzle is sealed and inserted into the axial channel from the first opening. The top sleeve includes an end cover with a central opening and an end cover side wall around its circumference. The end cover and the end cover side wall are an integral structure. The end cover side wall is sleeved on the front end of the gun barrel. The end cover presses the nozzle so that it is clamped and fixed between the top sleeve and the gun barrel. The front end of the nozzle extends out from the central opening of the end cover. A radial convexity that fits the end cover is arranged around the side wall in the middle of the nozzle and is matched with the end cover, and the radial convexity is covered in the top sleeve. There is a gap between the top sleeve, the nozzle covered therein, and the front end of the gun barrel, and the three form an annular air channel. The second opening connects the annular air channel and the gas delivery channel, and the gas outlet channel extends outward to the nozzle side wall to form an external air hole, and the external air hole is located in the annular air channel. The nozzle is fastened to the front end of the barrel through the side wall of the end cover on the external top sleeve. The side wall of the end cover and the front end of the barrel can be connected by threads for easy disassembly and assembly. The nozzle can be removed from the front end of the barrel by removing the top sleeve, and the nozzle can be fastened to the front end of the barrel by installing the top sleeve. The radial outward protrusion in the middle of the nozzle matches the end cover to press the nozzle to the front end of the barrel; the rear of the nozzle is sealed and inserted into the axial channel from the first opening to dock with it, so that the nozzle cavity is supplied with paint; the top sleeve, the nozzle and the front end of the barrel form an annular air channel, which is connected to the air supply channel and the air outlet channel through the second opening and the external air hole, respectively, to ensure that the compressed air is smoothly delivered to the nozzle cavity and evenly mixed with the paint.

[0012] The axial channel extends backward to the outer wall of the gun barrel above the buttstock to form an opening, and the opening is sealed and embedded in the front sealing sleeve, the center of the front sealing sleeve has a hole, and the front part of the first gun needle penetrates into the axial channel from the opening, and the first gun needle and the front sealing sleeve are sealed and connected. A hole is opened on the outer wall of the gun barrel to embed the front sealing sleeve to install the first gun needle, and the front sealing sleeve ensures that the front part of the first gun needle is sealed and penetrates into the axial channel, and the first gun needle will not leak out when the gas transmission channel is opened and closed.

[0013] The trigger is provided with a movable lock buckle, which can be rotated to press against the buttstock, lock the trigger and open the feeding channel and the air intake channel. The movable lock buckle is used to facilitate workers to operate the spray gun without pressing the trigger all the time. The trigger can be locked by rotating the movable lock buckle to press against the buttstock, limiting its elastic reset; the trigger can be unlocked by rotating the movable lock buckle in the opposite direction.

[0014] The present invention provides a double-link paint spray gun, which can be operated with one hand. The trigger is pressed to control the synchronous opening and closing of a material feeding channel and an air intake channel, so as to achieve the coordination of air intake and material feeding, and open or close the air supply and material feeding at the same time. The operation is simple and easy to use. The atomization structure is more reasonable, and the paint atomization effect is more uniform. The center of the nozzle cavity supplies paint, and the air outlet channel surrounding the side wall supplies compressed air. The compressed air surrounds the paint, and the two are mixed more evenly. There is less splashing of paint during spraying, and the paint utilization rate is improved with less waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : Schematic diagram of the structure of the present invention.

[0016] In the figure: 1. gun barrel, 2. nozzle, 3. gun handle, 4. trigger, 5. nozzle, 6. gas delivery channel, 7. material delivery channel, 71. axial channel, 72. radial channel, 8. air inlet channel, 9. air inlet, 10. buttstock, 11. material inlet, 12. air outlet channel, 13. first gun needle, 14. adjustment nut, 15. first gun needle spring, 16. gun needle hole, 17. second gun needle, 18. second gun needle spring, 19. installation hole, 20. sleeve , 21. annular groove, 22. first tail cover, 23. transverse air inlet channel, 24. second tail cover, 25. sealing end, 26. boss, 27. variable diameter hole, 28. sealing sleeve, 29. slot hole, 30. first opening, 31. second opening, 32. top cover, 321. end cover, 322. end cover side wall, 33. radial outward protrusion, 34. annular air channel, 35. outer air hole, 36. front sealing sleeve, 37. movable lock, 38. tail cover, 39. inner air hole. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0018] like Figure 1As shown, a double-link paint spray gun includes a gun barrel 1, a nozzle 2, a gun handle 3 and a trigger 4. The nozzle 2 is arranged at the front end of the gun barrel 1, and the front end of the nozzle 2 is opened to form a nozzle 5. The gun barrel 1 is provided with an air delivery channel 6 and a material delivery channel 7, and the two channels are connected to the inner cavity of the nozzle 2. The gun handle 3 is connected to the rear of the gun barrel 1. The trigger 4 is movably connected to the gun barrel 1 on the front side of the gun handle 3. An air intake channel 8 is arranged in the gun handle 3. The upper end of the air intake channel 8 is connected to the air delivery channel 6, and the lower end is connected to the bottom of the gun handle 3 to set an air intake port 9 to connect to the air source. The material delivery channel 7 is arranged at the front of the gun barrel 1 and is connected to the gun barrel 1 by an axial channel 71 in the gun barrel 1 and an axial channel 72 in the gun barrel 1. The radial channel 72 in the buttstock 10 is connected, the axial channel 71 extends forward and seals the opening at the rear end of the nozzle 2, the radial channel 72 is connected to the feed port 11 opened at the bottom of the buttstock 10, four evenly distributed air outlet channels 12 are arranged around the side wall of the inner cavity of the nozzle 2 to connect to the air supply channel 6, and the air outlet channels 12 extend inward to the side wall of the inner cavity of the nozzle 2 to form an inner air hole 39, the barrel 1 and the gun handle 3 are respectively provided with a discharge component and an air intake component for controlling the opening and closing of the feed channel 7 and the air intake channel 8, and the trigger 4 can simultaneously control the discharge component and the air intake component to synchronously open and close the corresponding channels. The arrow A in the figure indicates feeding, and the arrow B indicates air supply. The present invention can be operated with one hand. The trigger is pressed to control the synchronous opening and closing of the material feeding channel and the air inlet channel, so as to realize the coordination of air inlet and material feeding, and open or close the air supply and material feeding at the same time. The operation is simple and easy to use. The atomization structure is more reasonable and the atomization effect is more uniform. The center of the nozzle cavity supplies paint, and the air outlet channel surrounding the side wall supplies compressed air. The compressed air surrounds the paint, and the two are mixed more evenly. There is less splashing of paint during spraying, and the utilization rate of the paint is improved with less waste. The air inlet at the bottom of the gun handle and the feed port on the buttstock can be connected to the air supply source and the feed source for continuous air supply and material feeding, so that the paint spray gun can work continuously for a long time.

[0019] Furthermore, the discharge assembly includes a first gun needle 13, an adjusting nut 14 connected to the trigger 4, and a first gun needle spring 15. The front portion of the first gun needle 13 is sealed and penetrates into the axial channel 71 and can move along the axial direction of the gun barrel 1 to open and close the axial channel 71 and the nozzle 2. The rear portion of the first gun needle 13 passes through the adjusting nut 14 and then penetrates into the gun handle 3 and a tail sleeve 38 is placed at the end to resist the first gun needle spring 15. The adjusting nut 14 is screwed on the first gun needle 13 through a thread, and a matching outer sleeve is provided at the joint portion of the first gun needle 13 and the adjusting nut 14. The first needle spring 15 is limited in the needle channel 16 set in the gun handle 3 and pushes the first needle 13 forward elastically; the air intake assembly includes a second needle 17 and a second needle spring 18, the rear of the second needle 17 is sealed and penetrated into the air intake channel 8 on the gun handle 3 and can move along the axial direction of the gun barrel 1 to open and close the air intake channel 8, the front of the second needle 17 extends out of the gun handle 3 and presses forward against the trigger 4, the second needle spring 18 is limited in the air intake channel 8 and pushes the second needle 17 forward elastically, and the second needle spring 18 is located below the first needle spring 15. When working, pulling the trigger can drive the first needle and the second needle to move synchronously to open the corresponding channel, and the air supply and material supply are opened at the same time. When the trigger is released, the two needles are pushed back by their respective needle springs, and the air supply and material supply are closed at the same time; the two needles are sealed and penetrated into the axial channel and the air intake channel respectively, ensuring that no leakage occurs when the needles are active. Pulling the trigger drives the adjusting nut to drive the first gun needle to retreat, compress the first gun needle spring, and open the feed channel to supply material to the nozzle. After releasing the trigger, the first gun needle spring resets and pushes the first gun needle back to its position, and closes the feed channel to supply material to the nozzle, and the adjusting nut and the trigger also return accordingly; when the trigger is pulled, the second gun needle is also pushed back synchronously and the second gun needle spring is compressed, and the air intake channel is opened to supply air to the air delivery channel. After releasing the trigger, the second gun needle spring resets and pushes the second gun needle back to its position, and closes the air intake channel to supply air to the air delivery channel.

[0020] The gun needle channel 16 is formed by connecting a mounting channel 19 that passes through the gun handle 3 horizontally and a sleeve 20 that is sleeved on the front part of the channel. The front part of the mounting channel 19 passes through the air inlet channel 8. The outer wall of the sleeve 20 is provided with a concave annular groove 21 at a position that coincides with the air inlet channel 8. The axial length of the annular groove 21 is greater than the cross-sectional size of the air inlet channel at the coincident position, so that an annular gap exists between the air inlet channel 8 and the outer wall of the sleeve 20 at the coincident position. The outer diameter of the sleeve 20 on both sides of the annular groove 21 matches the inner diameter of the mounting channel 19 for sealing. The rear end of the mounting channel 19 is open and a first tail cover 22 is provided for sealing. The first gun needle spring 15 is pressed against the first tail cover 22 backwards. A There is a transverse air intake channel 23, the air intake channel 8 connected to the front end of the transverse air intake channel 23 extends upward, the rear part of the transverse air intake channel 23 connects the air intake channel and the air inlet port 9, and a reducing hole 27 is provided at the turning point of the connecting air intake channel, the reducing hole 27 is a cone with a large outside and a small inside, and the aperture increases from left to right in Figure 1, the transverse air intake channel 23 extends backward through the gun handle 3 and is sealed with a second tail cover 24, the rear part of the second gun needle 17 seals and penetrates the transverse air intake channel 23, the rear end of the second gun needle 17 forms a sealing end 25 matching the reducing hole 27, and a convex column 26 is provided on the end surface of the sealing end 25, one end of the second gun needle spring 18 is sleeved on the convex column 26 to abut against the sealing end 25, and the other end abuts against the second tail cover 24. The gun needle channel is formed by the connection of the installation channel and the sleeve. The installation channel uses a built-in sleeve at the overlap position through the air inlet channel to achieve that the first gun needle movement and air intake do not affect each other. When the compressed air reaches the overlap position, it passes through the annular gap between the annular groove on the outer wall of the sleeve and the air inlet channel to ensure smooth gas transmission. The outer diameter of the sleeve on both sides of the annular groove and the sealing of the installation channel ensure that the gas in the annular gap does not leak. The rear part of the first gun needle moves and translates in the inner cavity of the sleeve and the installation channel. The rear end of the installation channel is open and a first tail cover is provided to seal so as to install a limiting first gun needle spring; the horizontal air inlet channel is used to install the second gun needle spring, and the rear seal of the second gun needle penetrates into the horizontal air inlet channel to ensure that the second gun needle is movable and translates in the inner cavity of the sleeve and the installation channel. There will be no air leakage when the gun moves, and at the same time, the second gun needle cooperates with the sealing end and the reducing hole thereon to open and close the air intake channel. When the sealing end is close to the reducing hole, the air intake channel is closed, and when the sealing end leaves the reducing hole, the air intake channel is opened; the reducing hole is conical, and fits well with the sealing end of the corresponding shape, and has good sealing performance. When the sealing end is close to the conical hole, the two can be guided to align and fit through the change of the hole diameter; the horizontal air intake channel runs through the gun handle backwards and is sealed with the second tail cover to install the second gun needle spring, so that the second gun needle spring can elastically push the second gun needle; the convex column limits one end of the second gun needle spring sleeved thereon, to ensure that the second gun needle spring is directly against the second gun needle, to avoid the spring not being aligned with the second gun needle and affecting its elastic reset.

[0021] A sealing sleeve 28 is sleeved in the transverse air intake passage 23, and the front and rear parts of the sealing sleeve 28 are sealedly connected to the transverse air intake passage 23. A hollow tube cavity extending along the length direction and opened at both ends is provided in the center of the sealing sleeve 28, and a second gun needle 17 is passed through the hollow tube cavity at the front of the sealing sleeve 28 and sealedly connected to the second gun needle 17, and the corresponding tube cavity at the rear of the sealing sleeve 28 and the second gun needle 17 are loosely matched. A slotted hole 29 in the middle of the sealing sleeve 28 connects the tube cavity with the air intake passage 8 extending upward from the front of the transverse air intake passage 23, and the reducing hole 27 is provided at the rear end opening of the sealing sleeve 28 and connects with the air intake passage 8 extending downward from the rear of the transverse air intake passage 23. The sealing sleeve is used to penetrate and install the second gun needle, wherein the front and rear of the sealing sleeve are sealedly connected to the transverse air inlet channel, and only the slot hole in the middle connects the tube cavity of the sealing sleeve with the two sections of the air inlet channel that are connected to the front and rear of the transverse air inlet channel to form an air supply channel. When the sealing end of the second gun needle is close to the reducing hole, the air supply channel is closed, and when the sealing end leaves the reducing hole, the air supply channel is opened; the corresponding tube cavity at the front of the sealing sleeve is sealedly connected to the second gun needle to prevent air leakage when the gun needle moves, and the corresponding tube cavity at the rear of the sealing sleeve is matched with the gap of the second gun needle, so that compressed air can pass through the gap and be delivered from the slot hole through the tube cavity.

[0022] The aperture of the rear opening of the nozzle 2 shrinks from outside to inside, and the front end of the first gun needle 13 is an arc end, which is larger than the small diameter end of the rear opening of the nozzle 2. The diameter of the variable diameter hole at the rear end of the nozzle gradually decreases from outside to inside, and the front end of the first gun needle is in an arc shape and matches the variable diameter hole, which can improve the sealing performance when the two are fitted together.

[0023] The axial channel 71 and the gas delivery channel 6 extend forward to the front end surface of the barrel 1 and form a first opening 30 and a second opening 31 respectively. The nozzle 2 is fastened to the front end of the barrel 1 through a top sleeve 32. The rear of the nozzle 2 is sealed and inserted into the axial channel 71 from the first opening 30. The top sleeve 32 includes an end cover 321 with a central opening and an end cover side wall 322 around its circumference. The end cover 321 and the end cover side wall 322 are an integral structure. The end cover side wall 322 is sleeved on the front end of the barrel 1. The end cover 321 presses the nozzle 2 to clamp it firmly. Between the top sleeve 32 and the barrel 1, the front end of the nozzle 2 extends out from the central opening of the end cover 321, and a radial protrusion 33 that fits the end cover 321 is arranged around the side wall in the middle of the nozzle 2, and the radial protrusion 33 is covered in the top sleeve 32. There is a gap between the top sleeve 32 and the nozzle 2 and the front end of the barrel 1 covered therein, and the three form an annular air channel 34. The second opening 31 connects the annular air channel 34 and the gas delivery channel 6, and the gas outlet channel 12 extends outward to the side wall of the nozzle 2 to form an external air hole 35, and the external air hole 35 is connected to the annular air channel 34. The nozzle is fastened to the front end of the barrel through the side wall of the end cover on the external top sleeve. The side wall of the end cover and the front end of the barrel can be connected by threads for easy disassembly and assembly. The nozzle can be removed from the front end of the barrel by removing the top sleeve, and the nozzle can be fastened to the front end of the barrel by installing the top sleeve. The radial outward protrusion in the middle of the nozzle matches the end cover to press the nozzle to the front end of the barrel; the rear of the nozzle is sealed and inserted into the axial channel from the first opening to dock with it, so that the nozzle cavity is supplied with paint; the top sleeve, the nozzle and the front end of the barrel form an annular air channel, which is connected to the air supply channel and the air outlet channel through the second opening and the external air hole, respectively, to ensure that the compressed air is smoothly delivered to the nozzle cavity and evenly mixed with the paint.

[0024] The axial channel 71 extends backward to the outer wall of the barrel 1 above the butt 10 to form an opening, and the opening is sealed and embedded in the front sealing sleeve 36. The center of the front sealing sleeve 36 has a hole, and the front part of the first gun needle 13 penetrates into the axial channel 71 from the opening, and the first gun needle 13 is sealed and connected to the front sealing sleeve 36. The outer wall of the barrel is opened to allow the front sealing sleeve to be embedded to install the first gun needle. The front sealing sleeve is used to ensure that the front part of the first gun needle is sealed and penetrates into the axial channel, and the first gun needle will not leak out when the gas transmission channel is opened and closed.

[0025] The trigger 4 is also provided with a movable lock 37, which can be rotated to abut against the butt 10, locking the trigger 4 to open the feed channel 7 and the air intake channel 8. The trigger can be locked by simply rotating the movable lock to abut against the butt, limiting its elastic reset, so that the worker does not need to press the trigger all the time when holding the spray gun; the trigger can be unlocked by rotating the movable lock in the opposite direction.

Claims

1. A double-link paint spray gun, comprising a gun barrel (1), a nozzle (2), a gun handle (3) and a trigger (4), wherein the nozzle (2) is arranged at the front end of the gun barrel (1), a hole is opened at the front end of the nozzle (2) to form a nozzle (5), an air delivery channel (6) and a material delivery channel (7) are arranged in the gun barrel (1), and the two channels are connected to the inner cavity of the nozzle (2), the gun handle (3) is connected to the rear part of the gun barrel (1), and the trigger (4) is movably connected to the gun barrel (1) on the front side of the gun handle (3), characterized in that The gun handle (3) is provided with an air intake passage (8), the upper end of the air intake passage (8) is connected to the air delivery passage (6), and the lower end is connected to the air intake port (9) provided at the bottom of the gun handle (3) to connect to the air source. The delivery passage (7) is provided at the front of the gun barrel (1) and is formed by connecting an axial passage (71) in the gun barrel (1) and a radial passage (72) in a gun stock (10) connected to the gun barrel (1). The axial passage (71) extends forward to seal the rear end opening of the nozzle (2), and the radial passage (72) is connected to the rear end opening of the nozzle (2). A feed inlet (11) is provided at the bottom of the buttstock (10); a plurality of air outlet channels (12) are evenly distributed around the inner cavity side wall of the nozzle (2) and connected to the air supply channel (6); the air outlet channels (12) extend inwardly to the inner cavity side wall of the nozzle (2) to form an inner air hole (39); a feed outlet component and an air supply component for controlling the opening and closing of the feed supply channel (7) and the air supply channel (8) are respectively provided on the gun barrel (1) and the gun handle (3); and the trigger (4) can simultaneously control the feed outlet component and the air supply component to synchronously open and close the corresponding channels; The discharge assembly comprises a first gun needle (13), an adjusting nut (14) connected to a trigger (4), and a first gun needle spring (15). The front portion of the first gun needle (13) is sealed and penetrates into the axial channel (71) and can move along the axial direction of the gun barrel (1) to open and close the joint between the axial channel (71) and the nozzle (2). The rear portion of the first gun needle (13) passes through the adjusting nut (14) and then penetrates into the gun handle (3). A tail sleeve (38) is placed at the end portion to resist the first gun needle spring (15). The adjusting nut (14) is screwed onto the first gun needle (13) through a thread. A matching external thread is provided at a joint portion of the first gun needle (13) and the adjusting nut (14). A needle spring (15) is limited in a needle channel (16) provided in the gun handle (3) to elastically push the first needle (13) forward; the air intake assembly comprises a second needle (17) and a second needle spring (18); the rear portion of the second needle (17) is sealed and penetrates into the air intake channel (8) on the gun handle (3) and can move along the axial direction of the gun barrel (1) to open and close the air intake channel (8); the front portion of the second needle (17) extends out of the gun handle (3) and presses forward against the trigger (4); the second needle spring (18) is limited in the air intake channel (8) to elastically push the second needle (17) forward; the second needle spring (18) is located below the first needle spring (15); The gun needle channel (16) is formed by connecting a mounting channel (19) that passes through the gun handle (3) transversely and a sleeve (20) that is sleeved at the front of the channel. The front of the mounting channel (19) passes through the air inlet channel (8). The outer wall of the sleeve (20) is provided with an inwardly concave annular groove (21) at a position that coincides with the air inlet channel (8). The axial length of the annular groove (21) is greater than the cross-sectional size of the air inlet channel at the coincident position, so that an annular gap exists between the air inlet channel (8) and the outer wall of the sleeve (20) at the coincident position. The outer diameters of the sleeve (20) on both sides of the annular groove (21) match the inner diameter of the mounting channel (19) to form a sealing fit. The rear end of the mounting channel (19) is open and a first tail cover (22) is provided for sealing. The first gun needle spring (15) is pressed backward against the first tail cover. (22); the air intake passage (8) below the first gun needle spring (15) comprises a horizontally extending transverse air intake passage (23); the front of the transverse air intake passage (23) is connected to the air intake passage (8) extending upward, and the rear of the transverse air intake passage (23) is connected to the air intake passage (8) extending downward, and a variable diameter hole (27) is provided at the turning point; the transverse air intake passage (23) extends backward through the gun handle (3) and is sealed by a second tail cover (24); the rear of the second gun needle (17) is sealed and penetrates into the transverse air intake passage (23); the rear end of the second gun needle (17) forms a sealing end (25) matching the variable diameter hole (27); the second gun needle spring (18) is arranged in the transverse air intake passage (23) and the two ends thereof respectively abut against the sealing end (25) and the second tail cover (24); The sealing sleeve (28) is sleeved in the transverse air inlet passage (23), and the front and rear parts of the sealing sleeve (28) are both sealed and connected to the transverse air inlet passage (23). The sealing sleeve (28) is provided at the center with a hollow tube cavity extending along its length direction and open at both ends, through which the second gun needle (17) is penetrated. The corresponding tube cavity at the front of the sealing sleeve (28) is sealed and connected to the second gun needle (17), and the corresponding tube cavity at the rear of the sealing sleeve (28) is gap-matched with the second gun needle (17). The middle slotted hole (29) of the sealing sleeve (28) communicates with the tube cavity and the air inlet passage (8) extending upward from the front of the transverse air inlet passage (23). The reducing hole (27) is provided at the rear end opening of the sealing sleeve (28) and communicates with the air inlet passage (8) extending downward from the rear of the transverse air inlet passage (23). The axial passage (71) and the gas delivery passage (6) extend forward to the front end surface of the gun barrel (1) and respectively form a first opening (30) and a second opening (31); the nozzle (2) is fastened to the front end of the gun barrel (1) through a top sleeve (32); the rear portion of the nozzle (2) is sealed and inserted into the axial passage (71) from the first opening (30); the top sleeve (32) comprises an end cover (321) with a central opening and an end cover side wall (322) surrounding the circumference thereof; the end cover (321) and the end cover side wall (322) are an integral structure; the end cover side wall (322) is sleeved on the front end of the gun barrel (1); the end cover (321) presses the nozzle (2) to clamp it and fix it thereon. Between the top sleeve (32) and the gun barrel (1), the front end of the nozzle (2) extends out from the central opening of the end cover (321), a radial protrusion (33) is arranged around the side wall of the middle of the nozzle (2) and is fitted with the end cover (321), and the radial protrusion (33) is covered in the top sleeve (32), and a gap exists between the top sleeve (32), the nozzle (2) covered therein, and the front end of the gun barrel (1), and the three of them form an annular air channel (34), the second opening (31) is connected to the annular air channel (34) and the gas delivery channel (6), and the gas outlet channel (12) extends outward to the side wall of the nozzle (2) to form an external air hole (35), and the external air hole (35) is connected to the annular air channel (34).

2. The double linkage paint spray gun according to claim 1, characterized in that A protruding column (26) is provided on the end surface of the sealing end (25), and one end of the second needle spring (18) is sleeved on the protruding column (26) to abut against the sealing end (25).

3. The double linkage paint spray gun according to claim 1, characterized in that The variable diameter hole (27) is in a tapered shape with a larger outer portion and a smaller inner portion.

4. The double linkage paint spray gun according to claim 1, characterized in that The aperture of the rear end opening of the nozzle (2) shrinks from the outside to the inside, and the front end of the first gun needle (13) is an arc end, which is larger than the small diameter end of the rear end opening of the nozzle (2).

5. The double linkage paint spray gun according to any one of claims 1 to 4, characterized in that The axial channel (71) extends rearward to the outer wall of the gun barrel (1) above the gun stock (10) to form an opening, and the opening is sealed and embedded in the front sealing sleeve (36). The front sealing sleeve (36) has a central opening, and the front part of the first gun needle (13) penetrates into the axial channel (71) from the opening, and the first gun needle (13) and the front sealing sleeve (36) are sealed and connected.

6. The double linkage paint spray gun according to any one of claims 1 to 4, characterized in that The trigger (4) is provided with a movable lock catch (37), and the movable lock catch (37) can be rotated to abut against the butt (10), thereby locking the trigger (4) and opening the feed passage (7) and the air intake passage (8).

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