CN211838549U

CN211838549U - Double-linkage paint spray gun

Info

Publication number: CN211838549U
Application number: CN201922456411.2U
Authority: CN
Inventors: 叶新阳
Original assignee: Hangzhou Hecheng Machinery Technology Co ltd
Current assignee: Hangzhou Hecheng Machinery Technology Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-11-03
Anticipated expiration: 2029-12-30

Abstract

The utility model relates to a spraying equipment field, especially a double linkage paint spray gun. The existing paint spray gun has the problems of troublesome control by two hands, high requirement on the upper hand, unreasonable atomization structure, poor paint atomization effect, low utilization rate, waste and the like. The utility model provides a pair linkage coating spray gun, including barrel, nozzle and stock and trigger, the barrel front end is located to the nozzle, and nozzle front end trompil forms the spout, be equipped with defeated air channel and defeated material passageway in the barrel, be equipped with the inlet channel of intercommunication defeated air channel in the stock, divide on barrel and the stock and establish the ejection of compact subassembly and the subassembly of admitting air of the defeated material passageway of control, inlet channel switching, but trigger simultaneous control ejection of compact subassembly corresponds the passageway with the synchronous switching of subassembly that admits air. The double-linkage paint spray gun of the utility model can easily and synchronously adjust the supply and mixing of the paint and the compressed air only by one hand; the atomizing structure is reasonable, the compressed air and the coating are atomized uniformly, the spraying effect is good, the coating splashes less, and the coating utilization rate is high.

Description

Double-linkage paint spray gun

Technical Field

The utility model relates to a spraying equipment field, especially a double linkage paint spray gun.

Background

Common wall whitewash is mostly manual batch scraping or machine spraying, wherein the machine spraying needs to use a paint spray gun. The existing paint spray gun comprises a spray gun body, wherein a gas conveying channel for butt joint of paint and a material conveying channel for butt joint of a compressed air supply source are arranged in the spray gun body, a spray nozzle is arranged at the front end of the paint spray gun, and the compressed air and the paint are mixed and then sprayed out from the spray nozzle. The prior paint spray gun has the following problems: 1. during operation, the two hands of a worker are matched, the air inlet and the feeding are controlled by the two hands respectively, and the operation of the worker is troublesome; 2. The atomizing structure is not reasonable, the atomizing effect of the compressed air sprayed outwards from the center of the inner cavity of the nozzle along the axial direction on the coating is not uniform enough, the impact force is large during spraying, the coating splashes seriously, the coating utilization rate is low, the waste is large, and the expected spraying effect cannot be achieved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems and the technical task that the utility model provides a double-linkage paint spray gun, which can easily and synchronously adjust the supply and mixing of paint and compressed air by only one-hand operation, and overcomes the problems of the prior paint spray gun that the operation of both hands is troublesome, the requirement of the upper hand is high, the atomization structure is unreasonable, the paint atomization effect is poor, the utilization rate is low, the waste is caused, and the like; the atomizing structure is reasonable, the compressed air and the coating are atomized uniformly, the spraying effect is good, the coating splashes less, and the coating utilization rate is high.

The utility model provides a technical scheme that technical problem adopted: a double-linkage 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 nozzle is formed by opening a hole at the front end of the nozzle, a gas transmission channel and a material transmission channel are arranged in the gun barrel, the two channels are communicated with a nozzle inner cavity, the gun handle is connected to the rear part of the gun barrel, the trigger is movably connected to the gun barrel at the front side of the gun handle, the double-linkage paint spray gun is characterized in that a gas inlet channel is arranged in the gun handle, the upper end of the gas inlet channel is communicated with the gas transmission channel, the lower end of the gas inlet channel is communicated with the bottom of the gun handle and is provided with a gas inlet and gas receiving source, the gas transmission channel is arranged at the front part of the gun barrel and is formed by connecting an axial channel in the gun barrel and a radial channel in a gun stock connected with the gun barrel, the axial channel extends forwards, the gun barrel and the gun handle are respectively provided with a discharging component and an air inlet component for controlling the opening and closing of the material conveying channel and the air inlet channel, and the trigger can simultaneously control the synchronous opening and closing of the discharging component and the air inlet component to correspond to the channels. The utility model can be operated by only one hand, the trigger is pressed to control the material conveying channel and the air inlet channel to keep the synchronous opening and closing of matching, the matching of air inlet and feeding is realized, the air supply and feeding are simultaneously opened or closed, and the operation is simple and convenient and easy to operate; the atomizing structure is more reasonable, the atomizing effect of the coating is more uniform, the coating is supplied to the center of the inner cavity of the nozzle, compressed air is supplied to the air outlet channel surrounding the side wall, the compressed air surrounds the coating, the coating and the compressed air are mixed more uniformly, the splashing of the coating is less during spraying, and the utilization rate of the coating is improved; the air inlet at the bottom of the gun handle and the feed inlet on the gun stock can be connected with an air supply source and a material supply source so as to continuously supply air and material and ensure that the paint spray gun can continuously work for a long time.

As further improvement and supplement to the above technical scheme, the utility model discloses a following technical measure: the discharging assembly comprises a first gun needle, an adjusting nut connected with a trigger and a first gun needle spring, the front part of the first gun needle penetrates into the axial passage in a sealing mode and can be movably opened and closed along the axial direction of a gun barrel to form a nozzle butt joint, the rear part of the first gun needle penetrates through the adjusting nut and then penetrates into the gun handle, a tail sleeve is sleeved at the end part of the first gun needle to abut against the first gun needle spring, the adjusting nut is screwed on the first gun needle through threads, a matched external thread is arranged at the butt joint part of the first gun needle and the adjusting nut, and the first gun needle spring is limited in a gun needle hole channel arranged in the gun handle to elastically push the first gun needle forwards; the air inlet assembly comprises a second gun needle and a second gun needle spring, the rear portion of the second gun needle penetrates into the air inlet channel on the gun handle in a sealing mode and can be movably opened and closed along the axial direction of the gun barrel, the front portion of the second gun needle extends out of the gun handle to abut against the trigger forwards, the second gun needle spring is limited in the air inlet channel and elastically pushes the second gun needle forwards, and the second gun needle spring is located below the first gun needle spring. The trigger is pulled to drive the first gun needle and the second gun needle to synchronously and movably open corresponding channels, air supply and material supply are simultaneously opened, the two gun needles are elastically pushed to reset by releasing the trigger through respective gun needle springs, and the air supply and the material supply are simultaneously closed; the two gun needles respectively penetrate into the axial channel and the air inlet channel in a sealing way, so that the gun needles are prevented from leaking during movement. When the device works, the trigger is pulled to drive the adjusting nut to drive the first gun needle to retreat to compress the first gun needle spring, the material conveying channel is opened to feed materials to the nozzle, the first gun needle spring is reset to push the first gun needle to return after the trigger is loosened, the material conveying channel is closed to feed materials to the nozzle, and the trigger also returns; the adjusting nut is screwed with the first gun needle, so that the first gun needle is conveniently adjusted to be matched with the trigger in place; when the trigger is pulled, the second gun needle is pushed to retreat synchronously and compress the second gun needle spring, the air inlet channel is opened to supply air to the air transmission channel, the second gun needle spring is reset after the trigger is released to push the second gun needle to return, and the air inlet channel is closed to supply air to the air transmission channel.

The gun needle duct is formed by butt joint of a mounting duct transversely penetrating through a gun handle and a sleeve sleeved at the front part of the duct, the front part of the mounting duct penetrates through an air inlet channel, an inwards concave annular groove is formed in the position, coinciding with the air inlet channel, of the outer wall of the sleeve, the length of the annular groove in the axial direction is larger than the size of the cross section of the air inlet channel at the coinciding position, so that an annular gap is formed between the air inlet channel and the outer wall of the sleeve at the coinciding position, the outer diameter of the sleeve on the two sides of the annular groove is matched with the inner diameter of the mounting duct in a sealing mode, a first tail cover seal is arranged at; the inlet channel of first gun needle spring below includes the horizontal inlet channel that one section level extends, and the anterior intercommunication of horizontal inlet channel upwards extends the inlet channel, and rear portion intercommunication downwardly extending's inlet channel is turning to the department and is establishing the reducing hole, and horizontal inlet channel extends backward and runs through the stock and establish the second tail-hood and seal, the sealed end that penetrates horizontal inlet channel in second gun needle rear portion, second gun needle rear end formation and reducing hole match, the second gun needle spring is located in the horizontal inlet channel and both ends are supported sealed end and second tail-hood respectively. The gun needle duct is formed by butt joint of a mounting duct and a sleeve, wherein the mounting duct realizes that the activity of a first gun needle and air inlet are not influenced by each other by using a built-in sleeve at a superposition position of passing through an air inlet channel, compressed air passes through an annular gap between an annular groove on the outer wall of the sleeve and the air inlet channel when reaching the superposition position to ensure smooth air transmission, the outer diameter of the sleeve at two sides of the annular groove is in sealing fit with the mounting duct to ensure that the air transmission in the annular gap is not leaked, the rear part of the first gun needle movably translates in an inner cavity of the sleeve and the mounting duct, and a first tail cover seal is arranged at the rear end of the mounting duct to facilitate mounting and limiting; the transverse air inlet channel is used for mounting a second gun needle spring, the rear part of the second gun needle penetrates into the transverse air inlet channel in a sealing manner, so that air leakage is avoided when the second gun needle moves, meanwhile, the second gun needle is matched with the air inlet channel to open and close through a sealing end and a reducing hole on the second gun needle, the air inlet channel is closed when the sealing end is tightly attached to the reducing hole, and the air inlet channel is opened when the sealing end leaves the reducing hole; the transverse air inlet channel penetrates through the gun handle backwards and is sealed by a second tail cover so as to install a second gun needle spring, and the second gun needle spring can elastically push a second gun needle.

The end face of the sealing end is provided with a convex column, and one end of the second gun needle spring is sleeved on the convex column to abut against the sealing end. The convex column is used for limiting one end of a second gun needle spring sleeved on the convex column, so that the second gun needle spring is ensured to be opposite to the second gun needle in a propping mode, and the situation that the spring is not aligned with the second gun needle to influence the elastic reset of the second gun needle is avoided.

The reducing hole is in a conical shape with a large outer part and a small inner part. The sealed end laminating of bell mouth and corresponding shape matches the leakproofness good, can also aim at the laminating through aperture change guide both when sealed end is close to the bell mouth, and the bell mouth front end corresponds trigger one side aperture and is little, and the rear end corresponds second tail-hood one side aperture greatly.

The seal cover is sleeved in the transverse air inlet channel, the front portion and the rear portion of the seal cover are in sealing connection with the transverse air inlet channel, the center of the seal cover is provided with a hollow tube cavity extending along the length direction of the seal cover, the two ends of the hollow tube cavity are provided with openings, a second gun needle penetrates through the hollow tube cavity, the front portion of the seal cover corresponds to the tube cavity and is in sealing connection with the two gun needles, the rear portion of the seal cover corresponds to the tube cavity and is in clearance fit with the second gun needle, a middle groove hole of the seal cover is communicated with the tube cavity and is in butt joint with the air inlet channel extending upwards in the front portion of the transverse air inlet channel. The sealing sleeve is used for mounting a second gun needle in a penetrating manner, wherein the front part and the rear part of the sealing sleeve are in sealing connection with the transverse air inlet channel, only the middle slotted hole is used for connecting the pipe cavity of the sealing sleeve with the two sections of air inlet channels which are butted with the front part and the rear part of the transverse air inlet channel, so as to form an air supply channel, when the sealing end of the second gun needle is tightly attached 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 front part of the sealing sleeve corresponds to the tube cavity and is connected with the second gun needle in a sealing manner, so that air leakage caused by the movement of the gun needle can be prevented, and the rear part of the sealing sleeve corresponds to the tube cavity and is in clearance fit with the second gun needle, so that compressed air can pass through the clearance and is sent out from the slotted hole through the tube cavity.

The aperture of the opening at the rear end of the nozzle is shrunk from outside to inside, the front end of the first gun needle is an arc end, and the arc end is larger than the small-diameter end of the opening at the rear end of the nozzle. The rear end of the nozzle is provided with a hole with a variable diameter, the hole diameter is gradually reduced from outside to inside, meanwhile, the front end of the first gun needle is arc-shaped and is larger than the small-diameter end of the variable diameter hole, and when the arc end is matched with the rear end of the nozzle, the arc end and the rear end of the nozzle are better in fit and sealing performance.

The axial channel and the gas transmission channel extend forwards to the front end face of the gun barrel and respectively form a first opening and a second opening, the nozzle is fastened at the front end of the gun barrel through a top sleeve, the rear part of the nozzle is inserted into the axial passage from the first opening in a sealing way, the top sleeve comprises an end cover with a central opening and an end cover side wall which surrounds the periphery of the end cover by a circle, the end cover and the end cover side wall are of an integral structure, the end cover side wall is sleeved at the front end of the gun barrel, the end cover compresses the nozzle to enable the nozzle to be tightly fixed between the top sleeve and the gun barrel, the front end of the nozzle extends out of the central opening of the end cover, the middle part of the nozzle is surrounded by the side wall and is provided with a radial outward protrusion matched with the end cover in a fitting way and is covered in the top sleeve, the nozzle covered in the top, the second opening is communicated with the annular air passage and the air delivery channel, the air outlet channel extends outwards to the side wall of the nozzle to form an outer air hole, and the outer air hole is located in the annular air passage. The nozzle is fastened at the front end of the gun barrel through the side wall part of the end cover on the external top sleeve, the side wall of the end cover and the front end of the gun barrel can be connected by threads, so that the disassembly and the assembly are convenient, the nozzle can be taken down from the front end of the gun barrel by disassembling the top sleeve, the nozzle can be fastened at the front end of the gun barrel by assembling the top sleeve, and the radial outward protrusion in the middle of the nozzle is matched with the end cover so as to press the nozzle at; the rear part of the nozzle is inserted into the axial channel from the first opening in a sealing way to be butted with the axial channel, so that the inner cavity of the nozzle is supplied with coating; the top sleeve, the nozzle and the front end of the gun barrel are enclosed to form an annular air passage, and the annular air passage is communicated with the air delivery channel and the air outlet channel through the second opening and the outer air hole respectively, so that compressed air is ensured to be smoothly delivered into the inner cavity of the nozzle to be uniformly mixed with the coating.

The gun barrel is characterized in that the axial channel extends backwards to the outer wall of the gun barrel above the gun stock to form an opening, the opening is embedded into the front sealing sleeve in a sealing mode, the center of the front sealing sleeve is provided with an opening, the front part of the first gun needle penetrates into the axial channel from the opening, and the first gun needle is connected with the front sealing sleeve in a sealing mode. The opening is arranged on the outer wall of the gun barrel so that the first gun needle can be installed by the embedded front sealing sleeve, the front part of the first gun needle is ensured to penetrate into the axial channel in a sealing manner through the front sealing sleeve, and the first gun needle cannot leak gas outwards when opening and closing the gas transmission channel.

The trigger is provided with a movable lock catch which can rotate to abut against the gun stock, and the trigger is locked to open the material conveying channel and the air inlet channel. The movable lock catch has the advantages that a worker can conveniently hold the spray gun by hand to operate without directly pressing the trigger, and the trigger can be locked only by rotating the movable lock catch to abut against the gun stock, so that the elastic reset of the trigger is limited; the locking of the trigger can be released by reversely rotating the movable lock catch.

The utility model provides a double-linkage paint spray gun, which can be operated by only one hand, the trigger is pressed to control the material conveying channel and the air inlet channel to be synchronously opened and closed, the matching of air inlet and feeding is realized, the air supply and feeding are simultaneously opened or closed, and the operation is simple and convenient and is easy to operate; atomizing structure is more reasonable, and coating atomization effect is more even, and nozzle inner chamber center supplies coating, encircles the outlet channel of lateral wall and supplies compressed air, and compressed air encircles coating, and both mixes more evenly, and coating splashes for a short time during the spraying, and the coating utilization ratio improves, extravagant few.

Drawings

FIG. 1: the utility model discloses the schematic structure.

In the figure: 1. the gun barrel, the nozzle, the gun handle, the trigger, the nozzle, the gun handle, the trigger, the nozzle, the air delivery channel, the gun support, the feed port, the air outlet channel, the gun needle, the adjusting nut, the gun needle spring, the gun needle duct, the gun needle, the gun support, the gun feed port, the gun discharge channel, the gun needle duct, the gun needle spring, the gun needle duct, the gun needle spring, the gun needle duct, the gun needle duct, the gun cover, the gun duct, the gun support, 37. Movable lock catch 38 tail sleeve 39 inner hole.

Detailed Description

The invention will be further described with reference to the following description and embodiments in conjunction with the accompanying drawings.

As shown in fig. 1, a double-linkage paint spray gun comprises 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 nozzle 5 is formed by opening a hole at the front end of the nozzle 2, a gas transmission channel 6 and a material transmission channel 7 are arranged in the gun barrel 1, the two channels are communicated with an inner cavity of the nozzle 2, the gun handle 3 is connected with the rear part of the gun barrel 1, the trigger 4 is movably connected to the gun barrel 1 at the front side of the gun handle 3, a gas inlet channel 8 is arranged in the gun handle 3, the upper end of the gas inlet channel 8 is communicated with the gas transmission channel 6, the lower end is communicated with the bottom of the gun handle 3 and is provided with a gas inlet 9 for receiving gas, the material transmission channel 7 is arranged at the front part of the gun barrel 1 and is formed by connecting an axial channel 71 in the gun barrel 1 and a radial channel 72 in a butt joint stock, four evenly distributed air outlet channels 12 are arranged on the side wall of the inner cavity of the nozzle 2 in a surrounding mode and communicated with the air delivery channel 6, the air outlet channels 12 extend inwards to the side wall of the inner cavity of the nozzle 2 to form an inner air hole 39, the gun barrel 1 and the gun handle 3 are respectively provided with a discharging assembly and an air inlet assembly for controlling the material delivery channel 7 and the air inlet channel 8 to be opened and closed, the trigger 4 can simultaneously control the discharging assembly and the air inlet assembly to be synchronously opened and closed corresponding channels, the arrow A indicates feeding, and the arrow B indicates air delivery. The utility model can be operated by only one hand, the trigger is pressed to control the material conveying channel and the air inlet channel to be synchronously opened and closed, the matching of air inlet and feeding is realized, the air supply and feeding are simultaneously opened or closed, and the operation is simple and convenient and easy to operate; the atomizing structure is more reasonable, the atomizing effect is more uniform, the coating is supplied to the center of the inner cavity of the nozzle, the compressed air is supplied to the air outlet channel surrounding the side wall, the compressed air surrounds the coating, the coating and the compressed air are mixed more uniformly, the splashing of the coating is less during spraying, the utilization rate of the coating is improved, and the waste is less; the air inlet at the bottom of the gun handle and the feed inlet on the gun stock can be connected with an air supply source and a material supply source so as to continuously supply air and material and ensure that the paint spray gun can continuously work for a long time.

Further, the discharging assembly comprises a first gun needle 13, an adjusting nut 14 connected with a trigger 4 and a first gun needle spring 15, the front part of the first gun needle 13 penetrates into the axial passage 71 in a sealing manner and can be movably opened and closed along the axial direction of the gun barrel 1 at the butt joint of the axial passage 71 and the nozzle 2, the rear part of the first gun needle 13 penetrates through the adjusting nut 14 and then penetrates into the gun handle 3, a tail sleeve 38 is sleeved at the end part to abut against the first gun needle spring 15, the adjusting nut 14 is screwed on the first gun needle 13 through threads, a matched external thread is arranged at the butt joint part of the first gun needle 13 and the adjusting nut 14, and the first gun needle spring 15 is limited in a gun needle duct 16 arranged in the gun handle 3 to elastically push the first gun needle 13 forwards; the air inlet assembly comprises a second gun needle 17 and a second gun needle spring 18, the rear part of the second gun needle 17 penetrates into the air inlet channel 8 on the gun handle 3 in a sealing mode and can be movably opened and closed along the axial direction of the gun barrel 1, the front part of the second gun needle 17 extends out of the gun handle 3 to be pressed against the trigger 4 forwards, the second gun needle spring 18 is limited in the air inlet channel 8 to elastically push the second gun needle 17 forwards, and the second gun needle spring 18 is located below the first gun needle spring 15. When the device works, the first gun needle and the second gun needle can be driven to synchronously move to open corresponding channels by pressing the trigger, air supply and material supply are simultaneously opened, the two gun needles are elastically pushed to reset by releasing the trigger through respective gun needle springs, and the air supply and the material supply are simultaneously closed; the two gun needles respectively penetrate into the axial channel and the air inlet channel in a sealing way, so that the gun needles are prevented from leaking during movement. The trigger is pulled to drive the adjusting nut to drive the first gun needle to retreat to compress the first gun needle spring, the material conveying channel is opened to supply materials to the nozzle, the first gun needle spring is reset to push the first gun needle to return after the trigger is loosened, the material conveying channel is closed to supply materials to the nozzle, and the adjusting nut and the trigger also return; when the trigger is pulled, the second gun needle is synchronously pushed to synchronously retreat and compress the second gun needle spring, the air inlet channel is opened to supply air to the air delivery channel, the second gun needle spring is reset after the trigger is released to push the second gun needle to return, and the air inlet channel is closed to supply air to the air delivery channel.

The gun needle duct 16 is formed by butt joint of a mounting duct 19 transversely penetrating through the gun handle 3 and a sleeve 20 sleeved at the front part of the duct, the front part of the mounting duct 19 penetrates through the air inlet channel 8, an inward concave annular groove 21 is formed in the outer wall of the sleeve 20 at the position coinciding with the air inlet channel 8, the length of the annular groove 21 in the axial direction is larger than the size of the cross section of the air inlet channel at the coinciding position, so that an annular gap is formed between the air inlet channel 8 and the outer wall of the sleeve 20 at the coinciding position, the outer diameter of the sleeve 20 at the two sides of the annular groove 21 is matched with the inner diameter of the mounting duct 19 in a matching and sealing manner, a first tail cover 22 is arranged at the rear end of the; be equipped with a horizontal inlet channel 23 on the inlet channel 8 of first gun needle spring 15 below, inlet channel 8 that horizontal inlet channel 23 front end is connected upwards extends, and horizontal inlet channel 23 rear portion is connected inlet channel and air inlet 9 and is established reducing hole 27 in butt joint inlet channel's the department of turning to, and reducing hole 27 is the toper of outer big-end-up, and 1 aperture grow from left to right in the picture, horizontal inlet channel 23 backward extends and runs through stock 3 and establish second tail-hood 24 sealed, the sealed horizontal inlet channel 23 that penetrates in second gun needle 17 rear portion, and second gun needle 17 rear end forms the sealed end 25 that matches with reducing hole 27, is equipped with a projection 26 on the terminal surface of sealed end 25, supports sealed end 25 on the projection 26 is put to second gun needle spring 18 one end cover, and the other end supports second tail-hood 24. The gun needle duct is formed by butt joint of a mounting duct and a sleeve, the mounting duct realizes that the activity of a first gun needle and air inlet are not influenced by each other by using a built-in sleeve at a superposition position of passing through an air inlet channel, compressed air passes through an annular gap between an annular groove on the outer wall of the sleeve and the air inlet channel when reaching the superposition position to ensure smooth air transmission, the outer diameter of the sleeve at two sides of the annular groove is in sealing fit with the mounting duct to ensure that the air transmission in the annular gap is not leaked, the rear part of the first gun needle movably translates in an inner cavity of the sleeve and the mounting duct, and a first tail cover seal is arranged at the rear end opening of the mounting duct to facilitate mounting of; the transverse air inlet channel is used for mounting a second gun needle spring, the rear part of the second gun needle penetrates into the transverse air inlet channel in a sealing manner, so that air leakage is avoided when the second gun needle moves, meanwhile, the second gun needle is matched with the air inlet channel to open and close through a sealing end and a reducing hole on the second gun needle, the air inlet channel is closed when the sealing end is tightly attached to the reducing hole, and the air inlet channel is opened when the sealing end leaves the reducing hole; the tapered hole is conical, the tapered hole is attached to the sealing end with a corresponding shape, the sealing performance is good, and the sealing end can be aligned and attached through the change of the diameter when approaching the tapered hole; the transverse air inlet channel penetrates through the gun handle backwards and is sealed by a second tail cover so as to be convenient for mounting a second gun needle spring, and the second gun needle spring can elastically push a second gun needle; the convex column limits one end of a second gun needle spring sleeved on the convex column, so that the second gun needle spring is ensured to be just opposite to the second gun needle, and the spring is prevented from being misaligned with the second gun needle to influence the elastic reset of the second gun needle.

The seal cover 28 is arranged in the transverse air inlet channel 23, the front part and the rear part of the seal cover 28 are in sealing connection with the transverse air inlet channel 23, the seal cover 28 is arranged at the center and extends along the length direction of the seal cover, a hollow tube cavity with two open ends penetrates through the second gun needle 17, the front part of the seal cover 28 corresponds to the tube cavity and is in sealing connection with the second gun needle 17, the rear part of the seal cover 28 corresponds to the tube cavity and is in clearance fit with the second gun needle 17, a middle slotted hole 29 of the seal cover 28 is communicated with the tube cavity and is in butt joint with an air inlet channel 8 which extends upwards at the front part of the transverse air inlet channel 23, and a variable diameter hole 27 is arranged at the opening at the rear end. The sealing sleeve is used for mounting a second gun needle in a penetrating manner, wherein the front part and the rear part of the sealing sleeve are in sealing connection with the transverse air inlet channel, only the middle slotted hole is used for connecting the pipe cavity of the sealing sleeve with the two sections of air inlet channels which are butted with the front part and the rear part of the transverse air inlet channel, so as to form an air supply channel, when the sealing end of the second gun needle is tightly attached 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 front part of the sealing sleeve corresponds to the tube cavity and is connected with the second gun needle in a sealing manner, so that air leakage caused by the movement of the gun needle can be prevented, and the rear part of the sealing sleeve corresponds to the tube cavity and is in clearance fit with the second gun needle, so that compressed air can pass through the clearance and is sent out from the slotted hole through the tube cavity.

The rear end of the nozzle 2 is provided with an opening with an aperture contracting from outside to inside, the front end of the first gun needle 13 is an arc end, and the arc end is larger than the small-diameter end of the rear end of the nozzle 2. The diameter of the reducing hole at the rear end of the nozzle is gradually reduced from outside to inside, and the front end of the first gun needle is arc-shaped and matched with the reducing hole, so that the sealing property when the first gun needle and the reducing hole are attached can be improved.

The axial passage 71 and the gas transmission passage 6 extend forwards to the front end face of the barrel 1 and form a first opening 30 and a second opening 31 respectively, the nozzle 2 is fastened at the front end of the barrel 1 through a top sleeve 32, the rear part of the nozzle 2 is inserted into the axial passage 71 from the first opening 30 in a sealing way, the top sleeve 32 comprises an end cover 321 with a central opening and an end cover side wall 322 which surrounds the end cover in a circle, the end cover 321 and the end cover side wall 322 are of an integral structure, the end cover side wall 322 is sleeved at the front end of the barrel 1, the end cover 321 tightly presses the nozzle 2 to be clamped and fixed 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, the middle part of the nozzle 2 is provided with a radial convex 33 which is matched with the end cover 321 in an abutting mode and the radial convex 33 is covered in the top sleeve 32, the top sleeve 32 and the nozzle 2 and the front end of the barrel 1 which are covered, the air outlet channel 12 extends outwards to the side wall of the nozzle 2 to form an outer air hole 35, and the outer air hole 35 is communicated with the annular air passage 34. The nozzle is fastened at the front end of the gun barrel through the side wall part of the end cover on the external top sleeve, the side wall of the end cover and the front end of the gun barrel can be connected by threads, so that the disassembly and the assembly are convenient, the nozzle can be taken down from the front end of the gun barrel by disassembling the top sleeve, the nozzle can be fastened at the front end of the gun barrel by assembling the top sleeve, and the radial outward protrusion in the middle of the nozzle is matched with the end cover so as to press the nozzle at; the rear part of the nozzle is inserted into the axial channel from the first opening in a sealing way to be butted with the axial channel, so that the inner cavity of the nozzle is supplied with coating; the top sleeve, the nozzle and the front end of the gun barrel are enclosed to form an annular air passage, and the annular air passage is communicated with the air delivery channel and the air outlet channel through the second opening and the outer air hole respectively, so that compressed air is ensured to be smoothly delivered into the inner cavity of the nozzle to be uniformly mixed with the coating.

The axial passage 71 extends backwards to form an opening in the outer wall of the barrel 1 above the stock 10, the opening is embedded in the front sealing sleeve 36 in a sealing mode, the center of the front sealing sleeve 36 is provided with an opening, the front part of the first gun needle 13 penetrates into the axial passage 71 from the opening, and the first gun needle 13 is connected with the front sealing sleeve 36 in a sealing mode. The opening is arranged on the outer wall of the gun barrel so that the first gun needle can be installed by the embedded front sealing sleeve, the front part of the first gun needle can be ensured to penetrate into the axial channel in a sealing mode by the aid of the front sealing sleeve, and the first gun needle cannot leak air outwards when the air delivery channel is opened and closed movably.

The trigger 4 is also provided with a movable lock catch 37, the movable lock catch 37 can rotate to abut against the gun stock 10, and the trigger 4 is locked to open the material conveying channel 7 and the air inlet channel 8. The trigger can be locked only by rotating the movable lock catch to abut against the gun stock, so that the elastic reset of the trigger is limited, and a worker does not need to press the trigger all the time when holding the spray gun for operation; the locking of the trigger can be released by reversely rotating the movable lock catch.

Claims

1. A double-linkage paint spray gun comprises a gun barrel (1), a spray nozzle (2), a gun handle (3) and a trigger (4), wherein the spray nozzle (2) is arranged at the front end of the gun barrel (1), a spray opening (5) is formed in the front end of the spray nozzle (2), a gas transmission channel (6) and a material transmission channel (7) are arranged in the gun barrel (1), the two channels are communicated with an inner cavity of the spray nozzle (2), the gun handle (3) is connected to the rear part of the gun barrel (1), the trigger (4) is movably connected to the gun barrel (1) at the front side of the gun handle (3), the double-linkage paint spray gun is characterized in that a gas inlet channel (8) is arranged in the gun handle (3), the upper end of the gas inlet channel (8) is communicated with the gas transmission channel (6), the lower end of the gun handle (3) is communicated with the bottom of the air inlet (9) to connect with a gas source, the material transmission channel (7) is arranged at the front part of the gun barrel (1) and is formed by connecting an, axial passageway (71) extend sealed butt joint nozzle (2) rear end trompil forward, radial passageway (72) intercommunication stock (10) feed inlet (11) that the bottom was seted up, encircle on nozzle (2) inner chamber lateral wall and switch on gas transmission channel (6) of a plurality of gas outlet channel (12) of equipartition, gas outlet channel (12) inwards extend to nozzle (2) inner chamber lateral wall and form interior gas vent (39), establish the ejection of compact subassembly and the subassembly of admitting air of defeated material passageway (7), the switching of gas inlet channel (8) of control on barrel (1) and stock (3) branch, trigger (4) can control ejection of compact subassembly and the synchronous switching of subassembly of admitting air simultaneously and correspond the passageway.

2. The double-linkage paint spray gun according to claim 1, characterized in that the discharge assembly comprises a first needle (13), an adjusting nut (14) connected to the trigger (4) and a first needle spring (15), the front part of the first gun needle (13) penetrates into the axial passage (71) in a sealing way and can be movably opened and closed along the axial direction of the gun barrel (1) at the butt joint of the axial passage (71) and the nozzle (2), the rear part of the first gun needle (13) penetrates through the gun handle (3) after passing through the adjusting nut (14) and is sleeved with a tail sleeve (38) at the end part to abut against the first gun needle spring (15), the adjusting nut (14) is screwed on the first gun needle (13) through threads, a matched external thread is arranged at the butt joint part of the first gun needle (13) and the adjusting nut (14), and the first gun needle spring (15) is limited in a gun needle pore channel (16) arranged in the gun handle (3) and elastically pushes the first gun needle (13) forwards; the air inlet assembly comprises a second gun needle (17) and a second gun needle spring (18), the rear portion of the second gun needle (17) penetrates into an air inlet channel (8) on the gun handle (3) in a sealed mode and can be opened and closed along the axial direction of the gun barrel (1), the front portion of the second gun needle (17) extends out of the gun handle (3) to abut against a trigger (4) in an outward and forward mode, the second gun needle spring (18) is limited in the air inlet channel (8) to elastically push the second gun needle (17) forward, and the second gun needle spring (18) is located below the first gun needle spring (15).

3. A dual-linkage paint spray gun according to claim 2, characterised in that the needle duct (16) is formed by butt-joining a mounting duct (19) extending transversely through the shank (3) with a sleeve (20) fitted around the front of the duct, the front of the mounting duct (19) passing through the air inlet passage (8), the outer wall of the sleeve (20) being provided with an inwardly concave annular groove (21) at a position coinciding with the air inlet passage (8), the length of the annular groove (21) in the axial direction being greater than the cross-sectional dimension of the air inlet passage at the coinciding position, so that an annular gap is formed between the air inlet channel (8) and the outer wall of the sleeve (20) at the overlapped position, the outer diameter of the sleeve (20) at the two sides of the annular groove (21) is matched with the inner diameter of the mounting pore channel (19) in a matching and sealing way, the rear end of the mounting pore channel (19) is opened and provided with a first tail cover (22) for sealing, and the first gun needle spring (15) is pressed against the first tail cover (22) backwards; air inlet channel (8) of first gun needle spring (15) below include horizontal air inlet channel (23) that one section level extends, and horizontal air inlet channel (23) front portion intercommunication upwards extends air inlet channel (8), and rear portion intercommunication downwardly extending's air inlet channel (8) and turning to the department and establish reducing hole (27), and horizontal air inlet channel (23) extend backward and run through stock (3) and establish second tail-hood (24) and seal, sealed the penetrating horizontal air inlet channel (23) in second gun needle (17) rear portion, second gun needle (17) rear end formation and reducing hole (27) the sealed end (25) that match, second gun needle spring (18) are located in horizontal air inlet channel (23) and both ends are supported sealed end (25) and second tail-hood (24) respectively.

4. A dual-linkage paint spray gun according to claim 3, characterised in that the sealing end (25) is provided with a boss (26) on its end face, and the second needle spring (18) is fitted with the boss (26) on its one end against the sealing end (25).

5. A dual-linkage paint spray gun according to claim 3, characterised in that the reducing aperture (27) is tapered with a larger outer portion and a smaller inner portion.

6. The double-linkage paint spray gun according to claim 3, characterized in that a sealing sleeve (28) is sleeved in the transverse air inlet passage (23), the front part and the rear part of the sealing sleeve (28) are both connected with the transverse air inlet passage (23) in a sealing manner, the sealing sleeve (28) is provided with a hollow pipe cavity which extends along the length direction of the sealing sleeve and is provided with openings at two ends and penetrates through the second gun needle (17) in the center, the front part of the sealing sleeve (28) is connected with the second gun needle (17) in a sealing manner, the rear part of the sealing sleeve (28) is in clearance fit with the second gun needle (17) in a manner of corresponding to the pipe cavity, a middle slotted hole (29) of the sealing sleeve (28) is communicated with the pipe cavity and the air inlet passage (8), the reducing hole (27) is arranged at an opening at the rear end of the sealing sleeve (28) and communicated with an air inlet channel (8) which is connected with the transverse air inlet channel (23) and then extends downwards.

7. A dual-linkage paint spray gun according to claim 2, characterized in that the rear opening of the nozzle (2) is narrowed from outside to inside, and the front end of the first gun needle (13) is a circular arc end which is larger than the small diameter end of the rear opening of the nozzle (2).

8. A double-action paint spray gun according to claim 1, characterized in that said axial channel (71) and said air delivery channel (6) extend forward to the front end of the barrel (1) and form a first opening (30) and a second opening (31), respectively, said nozzle (2) is fastened to the front end of the barrel (1) by means of a crown (32), the rear part of the nozzle (2) is sealingly inserted into the axial channel (71) from the first opening (30), said crown (32) comprises a centrally open end cap (321) and a circumferentially surrounding end cap sidewall (322), the end cap (321) and the end cap sidewall (322) are of one piece construction, the end cap sidewall (322) is fitted over the front end of the barrel (1), the end cap (321) presses the nozzle (2) so as to be clamped between the crown (32) and the barrel (1), the front end of the nozzle (2) protrudes from the central opening of the end cap (321), and the middle part of the nozzle (2) is provided with a radially protruding outer wall (33) matching the outer protruding wall (321) and radially protrudes radially (33) The gun barrel is covered in the top sleeve (32), gaps are reserved between the top sleeve (32) and the front ends of the nozzle (2) and the gun barrel (1) covered in the top sleeve, the nozzle (2) and the gun barrel (1) enclose an annular air passage (34), the second opening (31) is communicated with the annular air passage (34) and the air transmission channel (6), the air output channel (12) extends outwards to the side wall of the nozzle (2) to form an outer air hole (35), and the outer air hole (35) is communicated with the annular air passage (34).

9. A dual-linkage paint spray gun according to one of claims 1 to 8, characterised in that the axial passage (71) extends rearwardly to form an opening in the outer wall of the barrel (1) above the butt (10), said opening being sealingly engaged by a front sealing sleeve (36), the front sealing sleeve (36) having a central opening, the front portion of the first needle (13) passing through the axial passage (71) from the opening, and the first needle (13) being sealingly connected to the front sealing sleeve (36).

10. A dual-linkage paint spray gun according to any one of claims 1 to 8, characterised in that the trigger (4) is provided with a movable catch (37), the movable catch (37) being rotatable against the butt (10) to lock the trigger (4) open the feed passage (7) and the air inlet passage (8).