CN111940158A

CN111940158A - Capsule type glue supplying and controlling spray gun

Info

Publication number: CN111940158A
Application number: CN202010821987.9A
Authority: CN
Inventors: 张国华; 邓宋明
Original assignee: Fujian Tongyi Environmental Protection Technology Co ltd
Current assignee: Fujian Tongyi Environmental Protection Technology Co ltd
Priority date: 2020-08-15
Filing date: 2020-08-15
Publication date: 2020-11-17
Anticipated expiration: 2040-08-15
Also published as: CN114832968A; CN114832968B; CN111940158B

Abstract

The invention discloses a capsule type spray gun for supplying and controlling glue, which comprises a gun body, wherein an air inlet channel, a valve cavity and a first air outlet channel which are sequentially communicated are arranged in the gun body, the air outlet end of the gun body is connected with an atomizing device through a fixing device, a rigid plastic glue outlet channel and a second air outlet channel are arranged in the atomizing device, the air outlet direction of the second air outlet channel is crossed with the glue outlet direction of the hard plastic glue outlet channel, a transition air channel for communicating the first air outlet channel with the second air outlet channel is arranged in the fixing device, an elastic plastic capsule is arranged in the fixing device, a glue inlet channel and a glue outlet cavity which are communicated are arranged in the elastic plastic capsule, the glue outlet cavity is communicated with a glue inlet of the hard plastic glue outlet channel, a movable plug is integrally arranged in the glue outlet cavity and controls the glue inlet of the hard plastic glue outlet channel to be opened or closed. The glue supply process of the invention is totally closed, so that the glue is completely isolated from metal and air, and the phenomena of caking, air leakage, material leakage and the like are avoided.

Description

Capsule type glue supplying and controlling spray gun

Technical Field

The invention belongs to the technical field of spray guns, and particularly relates to a capsule type spray gun for supplying and controlling glue.

Background

A spray gun is a device that uses a quick release of liquid or compressed air as a motive force. The spray gun is divided into a normal pressure type spray gun and a pressurized spray gun. The spray gun also comprises a pressure type spray gun, a Kale type spray gun and an automatic recovery type spray gun. The spray gun can be directly used for loading paint, sizing materials and the like in the industry, namely the simple spray gun can be installed in automatic equipment, such as an automatic glue sprayer, an automatic glue spreader, an automatic paint sprayer, an automatic coating machine and other spraying equipment. Current spray gun generally contains body of a gun and rifle head, and this body of a gun and rifle head pass through coupling mechanism and connect, and this rifle head contains the nozzle of metal material, and glue and pressurized air spout after the mixed atomizing in the nozzle, because glue and metal direct contact use easy production caking in the nozzle after a period of time, lead to blockking up and can not use, need often clear up, and is very inconvenient, and supplies glue in-process to take place easily phenomenons such as lou material, gas leakage, uses unreliable.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a capsule type spray gun for supplying and controlling glue, which does not generate the phenomena of caking, material leakage, air leakage and the like, and is convenient and reliable to use.

In order to achieve the purpose, the invention adopts the following technical scheme: a capsule type spray gun for supplying and controlling glue comprises a gun body, wherein a gas inlet channel, a valve cavity and a first gas outlet channel which are sequentially communicated are arranged in the gun body, the air outlet end of the gun body is connected with an atomizing device through a fixing device, a rigid plastic glue outlet channel and a second air outlet channel are arranged in the atomizing device, the air outlet direction of the second air outlet channel and the glue outlet direction of the hard plastic glue outlet channel are intersected in front of the atomizing device, a transition air passage communicated with the first air outlet channel and the second air outlet channel is arranged in the fixing device, an elastic plastic capsule is arranged in the fixing device, the elastic plastic capsule is internally provided with a glue inlet channel and a glue outlet cavity which are communicated, the glue outlet cavity is communicated with a glue inlet of the hard plastic glue outlet channel, the glue outlet cavity is internally and integrally provided with a movable plug which controls the opening or closing of a glue inlet of the hard plastic glue outlet channel.

Preferably, the glue inlet end of the glue inlet channel is exposed outside the gun body.

Preferably, fixing device includes protecgulum, preceding fixing base, back fixing base and hou gai, the fixed cover of back lid is established at the end of giving vent to anger of the rifle body, the rear end cover of back fixing base is established at the end of giving vent to anger of the rifle body and is covered fixed sealing connection with the back lid, the rear end of preceding fixing base and the fixed sealing connection of front end of back fixing base, elastic plastic capsule fixed mounting is between preceding fixing base and back fixing base, the protecgulum is connected with the fixed sealing connection of front end of preceding fixing base.

Preferably, the transition air passage includes a plurality of first transition passages, a plurality of second transition passages and a plurality of third transition passages, the plurality of first transition passages are uniformly provided in the side wall of the rear fixing seat, the rear end of the rear fixing seat is provided with a first annular ventilation groove, the first transition passages are communicated with the first air outlet passage through the first annular ventilation groove, the plurality of second transition passages are uniformly provided in the side wall of the front fixing seat, the second transition passages are communicated with the first transition passages in a sealing manner, the front end of the front fixing seat is provided with a second annular ventilation groove, the plurality of third transition passages are uniformly provided in the side wall of the front cover, and the third transition passages are communicated with the second transition passages through the second annular ventilation groove.

Preferably, atomizing device includes nozzle and hood, the nozzle includes outer mouth and interior mouth, interior mouth embedding is in outer mouth, the material of interior mouth is rigid plastic, rigid plastic goes out the center that the jiao dao seted up in the mouth, the rear end periphery of outer mouth and the interior circumferential thread of fixing device's front end are connected, the rear end of hood is interior to be connected with fixing device's front end periphery thread sealing, the hood covers outer mouth, form annular between the front end periphery side of outer mouth and the front end of hood inner periphery side second outlet channel.

Preferably, the middle part of the outer nozzle is provided with a second positioning outer flange, a third annular vent groove is formed in the rear side of the outer flange and communicated with the air outlet of the transition air passage, a plurality of uniformly distributed vent holes are formed in the third annular vent groove, and the vent holes are communicated with a second air outlet channel.

Preferably, an annular hard plastic seat is arranged between the rear end of the inner nozzle and the front end of the elastic plastic capsule, and the hard plastic seat is respectively in tight fit with the inner nozzle and the elastic plastic capsule.

Preferably, a control device for controlling the movable plug to open or close the glue inlet of the hard plastic glue outlet channel and controlling the air inlet of the first air outlet channel to open or close is mounted on the gun body.

Preferably, controlling means includes needle valve, trigger and material volume governing valve, the needle valve is installed in the valve chamber of the rifle body, the needle valve includes thimble and needle valve body, the front end of thimble and the rear end fixed connection of activity stopper, the top of trigger is through the middle activity hinge joint in the top of trigger round pin and the rifle body, the well upper portion of trigger is worn to be equipped with the thimble round pin of drive thimble back-and-forth movement, the rear end at the needle valve is installed to the material volume governing valve.

Preferably, the air inlet channel is arranged on the holding part of the gun body, an air pressure regulating valve for regulating the air inlet pressure of the air inlet channel is arranged on the gun body, and an air inlet joint is arranged at the air inlet of the air inlet channel on the gun body; a material pipe fixing groove is formed in the front side of the holding portion of the gun body, and a material pipe fixing connector is installed at the lower end of the material pipe fixing groove.

Compared with the prior art, the invention has the following beneficial effects: this spray gun adopts the elastic plastic capsule, adopts the passageway of advancing to glue that communicates in proper order, goes out to glue the chamber and rigid plastic goes out to glue the way, adopts first air outlet channel, transition air flue and the second air outlet channel that communicates in proper order, has realized that all glue ways and all air flues are isolated mutually, and it is totally closed to supply gluey process for glue (being the adhesive) is isolated with metal, air completely, can not produce phenomenons such as caking, gas leakage, hourglass material. The spray gun is compact in overall structure, light in weight design, convenient to use and good in market prospect, and a nozzle does not need to be cleaned.

Drawings

FIG. 1 is an assembly view of the structure of various embodiments of the present invention.

Fig. 2 is an exploded view of the structure of various embodiments of the present invention.

Fig. 3 is a structural sectional view of various embodiments of the present invention.

Fig. 4 is a perspective view of a rear fixing base in a third embodiment of the present invention.

Fig. 5 is a perspective view of a front fixing base in a third embodiment of the invention.

Fig. 6 is an exploded view of a nozzle structure according to a fourth embodiment of the present invention.

Fig. 7 is a perspective view of an elastic plastic capsule according to an eighth embodiment of the present invention.

The labels in the figure are: 100. a gun body; 101. an air intake passage; 102. a valve cavity; 103. a first air outlet channel; 104. a material pipe fixing groove; 110. an air pressure regulating valve; 120. an air inlet joint; 130. the material pipe is fixed with a joint; 140. hooking; 200. a fixing device; 201. a transition gas passage; 220. a front cover; 221. a third transition passage; 230. a front fixed seat; 231. a second transition channel; 232. a second annular vent groove; 240. a rear fixed seat; 241. a first transition passage; 242. a first annular vent groove; 250. a rear cover; 260. a rear fastening bolt; 270. a sealing ring is fixed; 280. a front fastening bolt; 290. a front fixed sealing ring; 300. an atomizing device; 301. a hard plastic glue outlet channel; 302. a second air outlet channel; 310. a nozzle; 311. an outer nozzle; 312. an inner nozzle; 313. a third annular vent groove; 314. a vent hole; 320. a hood; 330. a rigid plastic seat; 400. an elastic plastic capsule; 401. a glue inlet channel; 402. a glue outlet cavity; 410. a conical cylinder; 411. a movable plug; 412. a first positioning outer flange; 413. positioning the salient points; 420. feeding a rubber tube; 500. a control device; 510. a needle valve; 511. a thimble; 512. a needle valve body; 520. a trigger; 521. a trigger pin; 522. a thimble pin; 530. the material quantity regulating valve.

Detailed Description

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

The first embodiment is as follows: as shown in fig. 1 to 3, a capsule-type spray gun for supplying and controlling glue comprises a gun body 100 (made of metal), wherein a gas inlet passage 101, a valve cavity 102 (or called as a gas outlet cavity) and a first gas outlet passage 103 are arranged in the gun body 100 and sequentially communicated with each other, a gas outlet end of the gun body 100 is connected with an atomizing device 300 through a fixing device 200, a rigid plastic glue outlet passage 301 and a second gas outlet passage 302 are arranged in the atomizing device 300, a gas outlet direction of the second gas outlet passage 302 and a glue outlet direction of the rigid plastic glue outlet passage 301 are intersected in front of the atomizing device 300, a transition gas passage 201 communicated with the first gas outlet passage 103 and the second gas outlet passage 302 is arranged in the fixing device 200, an elastic plastic capsule 400 is arranged in the fixing device 200, a glue inlet passage 401 and a glue outlet cavity 402 communicated with each other are arranged in the elastic plastic capsule 400, the glue outlet cavity 402 is communicated with a glue inlet of the rigid plastic glue outlet passage 301, a movable plug 411 which is convex forwards is integrally arranged in the glue outlet cavity 402, and the movable plug 411 controls the opening or closing of a glue inlet of the hard plastic glue outlet channel 301. The front part of the movable plug 411 is preferably, but not limited to, in a cone shape with a small front part and a large rear part, which is beneficial to fast glue discharging.

When the glue is sprayed, no metal is contacted with the glue in the fixing device 200 and the atomizing device 300, so that the caking phenomenon cannot be generated; meanwhile, the glue outlet cavity 402 is isolated from the transition air passage 201, so that the phenomena of air leakage and material leakage are avoided; the glue supply is closed in the whole process, and does not contact with metal and air at all.

Example two: as shown in fig. 1 to 3, a capsule type spray gun for supplying and controlling glue has the following differences: the glue inlet end of the glue inlet channel 401 is exposed outside the gun body 100, and is convenient to be connected with a glue feeding pipe through a pipe joint.

Example three: as shown in fig. 1 to 5, a capsule type glue supplying and controlling spray gun according to one or two embodiments of the invention is characterized in that: fixing device 200 includes protecgulum 220 (its material is the metal), preceding fixing base 230 (its material is the metal), back fixing base 240 (its material is the metal) and back lid 250 (its material is the metal), the fixed end of giving vent to anger at rifle body 100 of establishing of back lid 250, the rear end cover of back fixing base 240 is established at the end of giving vent to anger of rifle body 100 and is fixed sealing connection with back lid 250, the rear end of preceding fixing base 230 and the fixed sealing connection of front end of back fixing base 240, elastic plastic capsule 400 fixed mounting is between preceding fixing base 230 and back fixing base 240, the fixed sealing connection of front end of protecgulum 220 and preceding fixing base 230.

In this embodiment, the transition air duct 201 includes a plurality of (e.g., four) first transition passages 241, a plurality of (e.g., four) second transition passages 231, and a plurality of (e.g., four) third transition passages 221, the plurality of first transition passages 241 are uniformly opened in the side wall of the rear fixing base 240, the rear end of the rear fixing seat 240 is provided with a first annular ventilation groove 242, the first transition channel 241 is communicated with (for example, four) first air outlet channels 103 through the first annular ventilation groove 242, the plurality of second transition channels 231 are uniformly arranged in the side wall of the front fixing seat 230, the second transition passage 231 is in sealed communication with the first transition passage 241 (e.g. via an O-ring seal), the front end of the front fixing seat 230 is provided with a second annular ventilation groove 232, a plurality of third transition channels 221 are uniformly arranged in the side wall of the front cover 220, the third transition passage 221 communicates with the second transition passage 231 through a second annular vent groove 232.

In this embodiment, the rear cover 250 may be sequentially and fixedly connected to the rear fixing seat 240 and the front fixing seat 230 by a rear fastening bolt 260, and a rear fixing sealing ring 270 is disposed between the rear cover 250 and the rear fixing seat 240, so as to ensure that the first transition channel 241 is communicated with the first air outlet channel 103 without leaking air; the front cover 220 may be fixedly connected to the front fixing base 230 by a front fastening bolt 280, and a front fixing sealing ring 290 is disposed between the front cover 220 and the front fixing base 230 to ensure that the third transition passage 221 and the second transition passage 231 do not leak air when communicating with each other.

Example four: as shown in fig. 1 to 6, a capsule type glue supplying and controlling spray gun according to the first, second or third embodiment is different in that: the atomizing device 300 includes a nozzle 310 and a cap 320 (made of metal), the nozzle 310 includes an outer nozzle 311 (made of metal) and an inner nozzle 312, the inner mouth 312 is embedded in the outer mouth 311, the material of the inner mouth 312 is hard plastic (particularly, but not limited to, polytetrafluoroethylene), the hard plastic glue outlet channel 301 is arranged at the center of the inner nozzle 312, the outer circumference of the rear end of the outer nozzle 311 is in threaded connection with the inner circumference of the front end of the fixing device 200 (specifically, the front cover 220), the inner circumference of the rear end of the hood 320 is in threaded sealing connection with the outer circumference of the front end of the fixing device 200 (specifically, the front cover 220) (i.e., threaded connection + O-ring seal to prevent the leakage of compressed air), the hood 320 covers the outer nozzle 311, and the second air outlet passage 302 is formed in a ring shape between the outer peripheral side of the front end of the outer nozzle 311 and the inner peripheral side of the front end of the hood 320.

In this embodiment, a second positioning outer flange is disposed in the middle of the outer nozzle 311, a third annular ventilation groove 313 is disposed on the rear side of the outer flange, the third annular ventilation groove 313 is communicated with the air outlet of the transition air duct 201, a plurality of (for example, ten) ventilation holes 314 uniformly distributed are disposed in the third annular ventilation groove 313, and the ventilation holes 314 are communicated with the second air outlet channel 302.

In this embodiment, an annular hard plastic seat 330 (specifically, preferably, but not limited to, a teflon material) is disposed between the rear end of the inner nozzle 312 and the front end of the elastic plastic capsule 400, and the hard plastic seat 330 is respectively tightly fitted with the inner nozzle 312 and the elastic plastic capsule 400, so as to ensure that the material does not leak outwards when the glue outlet cavity 402 is communicated with the hard plastic glue outlet channel 301, and ensure that air does not contact the glue in the glue outlet cavity 402.

Example five: as shown in fig. 1 to 3, a capsule type spray gun for supplying and controlling glue has the following differences: the gun body 100 is provided with a control device 500 for controlling the movable plug 411 to open or close the glue inlet of the hard plastic glue outlet channel 301 and controlling the air inlet of the first air outlet channel 103 to open or close. When the movable plug 411 opens the glue inlet of the hard plastic glue outlet channel 301, the air inlet of the first air outlet channel 103 is also opened at this time, and glue supply is started; when the movable plug 411 closes the glue inlet of the hard plastic glue outlet channel 301, the air inlet of the first air outlet channel 103 is also closed at this time, and the glue supply is stopped.

In the present embodiment, the control device 500 includes a needle valve 510, a trigger 520 and a material quantity regulating valve 530, wherein the needle valve 510 is installed in the valve cavity 102 of the gun body 100; the needle valve 510 may adopt an existing structure, and includes a thimble 511 and a needle valve body 512, wherein the needle valve body 512 cooperates with the valve cavity 102 to open or close an inlet of the first outlet passage 103; the front end of thimble 511 and the rear end fixed connection of activity stopper 411, the top of trigger 520 is through the middle activity hinge joint in the top of trigger round pin 521 and rifle body 100, the thimble pin 522 of drive thimble 511 back-and-forth movement is worn to be equipped with by the well upper portion of trigger 520, the rear end at needle valve 510 is installed to material quantity governing valve 530, material quantity governing valve 530 can adopt current structure, like manual formula screw rod type stroke control valve, has satisfied the demand that the customer adjusted the volume of gluing. To facilitate the suspension of the gun, the trigger pin 521 may be hinged with a hook 140.

The glue spraying method of the embodiment comprises the following steps: the trigger 520 is pressed to move the thimble 511 and the needle valve body 512 backward, the movable plug 411 of the elastic plastic capsule 400 leaves the glue inlet of the rigid plastic glue outlet channel 301, the needle valve body 512 leaves the air inlet of the first air outlet channel 103, glue in the glue outlet cavity 402 enters the plastic glue outlet channel at this time, compressed air in the valve cavity 102 sequentially enters the second air outlet channel 302, the transition air channel 201, (the vent hole 314) and the second air outlet channel 302, and the glue sprayed from the plastic glue outlet channel is atomized by air sprayed from the second air outlet channel 302 (specifically, atomized in front of the atomizing device 300) to start glue supply. When the trigger 520 is released, the thimble 511 and the needle valve body 512 move forward under the action of their respective return springs, the movable plug 411 of the elastic plastic capsule 400 abuts against the glue inlet of the sealed rigid plastic glue outlet channel 301, the needle valve body 512 abuts against the air inlet of the sealed first air outlet channel 103, at this time, the glue in the glue outlet cavity 402 cannot enter the plastic glue outlet channel, and the compressed air in the valve cavity 102 cannot enter the second air outlet channel 302, and stops supplying glue.

Example six: as shown in fig. 1 to 3, a capsule type glue supplying and controlling spray gun according to the first, second, third, fourth or fifth embodiment of the spray gun is different in that: the air inlet channel 101 is arranged at the holding part of the gun body 100, the gun body 100 is provided with an air pressure regulating valve 110 for regulating the air inlet pressure of the air inlet channel 101, and the air inlet joint 120 is arranged at the air inlet of the air inlet channel 101 of the gun body 100, so that the air inlet joint 120 is conveniently connected with an air supply pipe. Wherein, the air pressure regulating valve 110 adopts the existing structure, like manual screw rod type stroke control valve, has satisfied the demand that the customer adjusted the atmospheric pressure size.

Example seven: as shown in fig. 1 to 3, a capsule type spray gun for supplying and controlling glue has the following differences: a material tube fixing groove 104 is formed in the front side of the holding portion of the gun body 100, and a material tube fixing joint 130 is installed (e.g., screwed) at the lower end of the material tube fixing groove 104. When the rubber feeding device is used, the long rubber feeding pipe is connected with the material pipe fixing connector 130, the short rubber feeding pipe is connected with the short rubber feeding pipe through the material pipe fixing connector 130, the short rubber feeding pipe is fixedly embedded into the material pipe fixing groove 104, the short rubber feeding pipe is connected with the rubber feeding channel 401 of the elastic plastic capsule 400 through the double-head pipe connector, and the short rubber feeding pipe or the double-head pipe connector can penetrate through a through hole in the middle of the trigger 520.

Example eight: as shown in fig. 1 to 7, a capsule type spray gun for supplying and controlling glue has the following differences in the first, second, third, fourth, fifth, sixth or seventh embodiments: the front end and the rear end of the elastic plastic capsule 400 are respectively integrally provided with a first positioning outer flange 412, which is convenient to install in the fixing device 200, and specifically, the elastic plastic capsule 400 can be positioned between the front fixing seat 230 and the rear fixing seat 240 through the two first positioning outer flanges 412. The rear end of the elastic plastic capsule 400 is integrally (e.g. symmetrically) provided with two positioning protrusions 413, which facilitate positioning with the air outlet end of the gun body 100 (specifically, the positioning protrusions can be matched with the fabrication hole at the front end or the groove on the plug in the fabrication hole). The middle part of the elastic plastic capsule 400 is a cone 410 with a big front part and a small back part, and the inner cavity of the cone 410 is the glue outlet cavity 402; the lower part of the elastic plastic capsule 400 is integrally provided with a rubber inlet pipe 420, and the inner cavity of the rubber inlet pipe 420 is a rubber inlet channel 401.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and it should be understood by those skilled in the art that the above embodiments can be modified and equally varied without departing from the technical spirit of the present invention.

Claims

1. The utility model provides a capsule type supplies to glue spray gun of accuse glue, includes the rifle body, its characterized in that: the utility model discloses a glue gun, including the rifle body, the rifle body is equipped with inlet channel, valve pocket and the first air outlet channel that communicates in proper order, the end of giving vent to anger of the rifle body is connected with atomizing device through fixing device, it goes out to glue way and second air outlet channel to be equipped with rigid plastic in the atomizing device, the direction of giving vent to anger of second air outlet channel and rigid plastic go out the gluey direction of crossing in atomizing device's the place ahead of saying, be equipped with the transition air flue of first air outlet channel of intercommunication and second air outlet channel in the fixing device, install the elastic plastic capsule in the fixing device, be equipped with the gluey passageway of advancing and going out the gluey chamber that is linked together in the elastic plastic capsule, it goes out the gluey mouth of advancing that gluey way to go out gluey chamber and rigid plastic and is linked together, it is provided with.

2. The spray gun of claim 1, wherein: the glue inlet end of the glue inlet channel is exposed outside the gun body.

3. The spray gun of claim 1, wherein: fixing device includes protecgulum, preceding fixing base, back fixing base and hou gai, the fixed end of giving vent to anger at the rifle body is established to the back lid cover, the rear end cover of back fixing base establish the end of giving vent to anger at the rifle body and with back lid fixed sealing connection, the rear end of preceding fixing base and the front end fixed sealing connection of back fixing base, elastic plastic capsule fixed mounting is between preceding fixing base and back fixing base, the front end fixed sealing connection of protecgulum and preceding fixing base.

4. The spray gun of claim 3, wherein: the transition air passage comprises a plurality of first transition passages, a plurality of second transition passages and a plurality of third transition passages, the first transition passages are uniformly formed in the side wall of the rear fixing seat, a first annular vent groove is formed in the rear end of the rear fixing seat, the first transition passages are communicated with the first air outlet passage through the first annular vent groove, the second transition passages are uniformly formed in the side wall of the front fixing seat, the second transition passages are communicated with the first transition passages in a sealing mode, the front end of the front fixing seat is provided with the second annular vent groove, the third transition passages are uniformly formed in the side wall of the front cover, and the third transition passages are communicated with the second transition passages through the second annular vent groove.

5. The spray gun of claim 1, wherein: atomizing device includes nozzle and hood, the nozzle includes outer mouth and interior mouth, interior mouth embedding is in outer mouth, the material of interior mouth is rigid plastic, rigid plastic goes out to glue the center of saying and seting up in the mouth, the rear end periphery of outer mouth and the interior circumferential thread connection of fixing device's front end, the interior periphery of rear end of hood and fixing device's front end periphery thread sealing connection, the hood covers outer mouth, form annular between the front end periphery side of outer mouth and the front end interior periphery side of hood the second air outlet channel.

6. The spray gun of claim 5, wherein: the middle part of outer mouth is provided with the second location outward flange, the rear side of outward flange is opened and is equipped with third annular air channel, third annular air channel is linked together with the gas outlet of transition air flue, set up a plurality of evenly distributed's air vent in the third annular air channel, the air vent is linked together with second air outlet channel.

7. The spray gun of claim 5, wherein: an annular hard plastic seat is arranged between the rear end of the inner nozzle and the front end of the elastic plastic capsule, and the hard plastic seat is tightly matched with the inner nozzle and the elastic plastic capsule respectively.

8. The spray gun of claim 1, wherein: and the gun body is provided with a control device which controls the movable plug to open or close the glue inlet of the hard plastic glue outlet channel and controls the air inlet of the first air outlet channel to open or close.

9. The spray gun of claim 8, wherein: the control device comprises a needle valve, a trigger and a material quantity regulating valve, wherein the needle valve is installed in a valve cavity of the gun body, the needle valve comprises a thimble and a needle valve body, the front end of the thimble is fixedly connected with the rear end of the movable plug, the top of the trigger is movably hinged with the middle of the top of the gun body through a trigger pin, the middle upper part of the trigger is provided with the thimble pin for driving the thimble to move back and forth, and the material quantity regulating valve is installed at the rear end of the needle valve.

10. The spray gun of claim 1, wherein: the air inlet channel is arranged on the holding part of the gun body, an air pressure regulating valve for regulating the air inlet pressure of the air inlet channel is arranged on the gun body, and an air inlet joint is arranged at the air inlet of the air inlet channel on the gun body; a material pipe fixing groove is formed in the front side of the holding portion of the gun body, and a material pipe fixing connector is installed at the lower end of the material pipe fixing groove.