Out-gun mixing structure for two-component spray gun

Abstract

The utility model discloses an outside-gun mixing structure for a double-component spray gun, which comprises a spray gun body, a feeding adapter, a disposable plastic mixing pipe, a mixing screw and a disposable plastic spray head, and the disposable plastic mixing pipe and / or the disposable plastic spray head are / is made of plastic materials. The rear end of the disposable plastic mixing pipe is detachably connected with a discharging opening in the front end of the feeding adapter, the front end of the disposable plastic mixing pipe is detachably connected with a disposable plastic spray head, and a mixing screw rod is movably arranged in the cavity; the whole disposable plastic nozzle is of a T-shaped structure, a nozzle adapter at the rear end of the disposable plastic nozzle is detachably connected with a disposable plastic mixing pipe, an atomizing nozzle is arranged at the front end of the disposable plastic nozzle, and an air inlet connector at the lower end of the disposable plastic nozzle is externally connected with a high-pressure air source through a hose. The mixing pipe outside the gun is designed into a disposable quick-wear part, so that the spray gun is prevented from being blocked due to too fast reaction of materials, and the problem of non-uniform mixing outside the gun in the prior art is solved.

Description

Technical Field

[0001] This utility model belongs to the field of spray gun technology, and relates to a two-component mixing spray gun, and more particularly to an external mixing structure for a two-component spray gun. Background Technology

[0002] Two-component spray guns are used to mix and spray two or more different materials, mainly through two methods: in-gun mixing and out-of-gun mixing. Currently, in-gun mixing is the most common technology, but it can easily clog the spray gun for fast-reacting, highly reactive materials, and subsequent cleaning is also quite troublesome. Current out-of-gun mixing spraying technology suffers from problems such as difficulty in cleaning the mixer and uneven mixing outside the gun.

[0003] Patent 202223367305.5 discloses a self-cleaning two-component spray gun with multiple in-gun mixing. This spray gun features an atomizing cap and an air divider at the nozzle. Compressed air is evenly dispersed by the air divider, resulting in more uniform atomization of the raw material, thus ensuring even spraying of the concentrate. However, this technology is a pre-mixing-then-spraying type and is unsuitable for spraying rapidly curing materials.

[0004] In addition, patent 202323525706.3 discloses a two-component spray gun structure with a filter element, in which the first regulating valve and the second regulating valve are connected to the feed pipes of the two component materials respectively, and then the included angle between the two nozzles is adjusted so that the sprayed materials intersect to achieve external mixing. However, this mixing method cannot guarantee that materials with high viscosity are mixed evenly.

[0005] To address the technical deficiencies of existing two-component spray guns and to meet the construction requirements of externally mixed two-component materials, this study designs the external mixing head as a disposable consumable part. This avoids clogging of the spray gun due to excessively rapid material reaction and solves the problem of uneven external mixing (mixing in air) in existing technologies. Utility Model Content

[0006] This invention addresses the problem of uneven mixing (mixing in air) outside the gun in existing two-component spray guns by proposing an external mixing structure for two-component spray guns.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This utility model provides an external mixing structure for a two-component spray gun, including a feed adapter (200), a disposable plastic mixing tube (300), a mixing screw (400), and a disposable plastic nozzle (500), wherein: the rear end of the disposable plastic mixing tube (300) is detachably connected to the outlet of the front end of the feed adapter (200), and its front end is detachably connected to the disposable plastic nozzle (500), and the mixing screw (400) is movably arranged in the cavity; the disposable plastic nozzle (500) has an overall T-shaped structure, and its rear end nozzle adapter (502) is detachably connected to the disposable plastic mixing tube (300), its front end is provided with an atomizing nozzle (503), and its lower end air inlet connector (505) is connected to a high-pressure air source through a hose.

[0009] Preferably, the two feed ports at the rear end of the feed adapter (200) are respectively connected to the first discharge connector (101) and the second discharge connector (102) at the front end of the spray gun body (100), and the discharge port at the front end is connected to the two feed ports at the rear end in a Y-shape.

[0010] Preferably, the disposable plastic mixing tube (300) and / or disposable plastic nozzle (500) are made of transparent polystyrene (PS), polycarbonate (PC) or polymethyl methacrylate (PMMA).

[0011] Preferably, the disposable plastic mixing tube (300) includes a hollow tube body (301) arranged coaxially and connected as a whole, a rear end connecting part (302) and a head end tapered part (303). The diameter of the hollow tube body (301) is smaller than the diameter of the rear end connecting part (302), and at least two reinforcing ear plates (304) arranged circumferentially at intervals are provided at the connection between its rear end and the outer periphery of the rear end connecting part (302).

[0012] Preferably, the head-end tapered portion (303) is a slender tapered tube structure with a gradually changing diameter, or a tapered tube structure with external anti-slip texture, or a tapered tube structure with a slender outlet at the front end, and the diameter of the head-end tapered portion (303) is smaller than the diameter of the hollow tube (301), and the connection between the two is smooth.

[0013] More preferably, the outer periphery of the front end of the hollow tube (301) is provided with an external thread (305) that can be detachably connected to the disposable plastic nozzle (500), and the inner wall of the rear end of the rear end connection part (302) is provided with an internal thread that can be detachably connected to the front end of the feed adapter (200).

[0014] Preferably, the mixing screw (400) is a spiral agitator with a plurality of spiral blades, wherein the plurality of spiral blades are arranged at equal intervals.

[0015] Preferably, the disposable plastic nozzle (500) includes a nozzle intermediate tube (501), a nozzle adapter (502), and an atomizing nozzle (503) arranged coaxially and connected as a single unit, wherein:

[0016] The nozzle intermediate tube (501) is a tapered tube structure with one end larger than the other. Its rear end is detachably and sealed to the front end of the feed adapter (200) through the nozzle adapter (502), and the front end is connected to the atomizing nozzle (503).

[0017] More preferably, the rear end of the nozzle intermediate tube (501) is provided with the air inlet connector (505) communicating with it, and the air inlet connector (505) is externally connected to a pneumatic drive system.

[0018] More preferably, the air inlet connector (505) has an L-shaped structure and is provided with a one-way valve (504).

[0019] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0020] (1) The gun external mixing structure is mainly composed of a feeding adapter, a disposable plastic mixing tube, a mixing screw and a disposable plastic nozzle assembly. Its significant feature is that it can process material A and material B at the same time. The two materials are fully mixed in the gun nozzle through the disposable plastic mixing tube and the mixing screw, and then atomized and sprayed out from the disposable plastic nozzle.

[0021] (2) Detachable plastic mixing tube: To facilitate user replacement and cleaning, a detachable plastic mixing tube is specially designed. This mixing tube is a disposable item and can be directly replaced after use without a complicated cleaning process. The plastic mixing tube has a threaded mixing mechanism inside, ensuring uniform mixing of materials and adapting to materials of different viscosities.

[0022] (3) Replaceable plastic nozzle: In order to facilitate user replacement and cleaning, a plastic nozzle is specially designed. It can also be designed as a disposable item as needed. It is connected to the end of the detachable plastic mixing tube. The nozzle is equipped with an atomizing air inlet, which achieves uniform atomization spraying of materials through high-pressure gas.

[0023] (4) High-quality stainless steel gun body: The spray gun body is made of 403 or 416 stainless steel, which has excellent corrosion resistance and wear resistance, ensuring that the spray gun body can maintain good stability and durability during long-term use, and improving the service life of the spray gun body.

[0024] (5) Pneumatically driven atomized spraying: This gun is an externally mixed two-component spray gun connected to an external pneumatically driven system through a disposable plastic nozzle at its front end. The external pneumatically driven system provides a high-pressure air source, and the two-component mixture is sprayed out by air pressure. It is easy to operate and the spraying effect is uniform. Users only need to adjust the air pressure to easily control the spraying flow and coverage. Attached Figure Description

[0025] Figure 1 This is a front view schematic diagram of the external mixing structure of a two-component spray gun according to the present invention.

[0026] Figure 2 This is a cross-sectional view of the external mixing structure of a two-component spray gun according to the present invention.

[0027] Figure 3 This is a three-dimensional structural diagram of an external mixing structure for a two-component spray gun according to the present invention. Figure 1 ;

[0028] Figure 4 This is a schematic diagram of the explosive structure of an external mixing structure for a two-component spray gun according to the present invention. Figure 1 ;

[0029] Figure 5 This is a three-dimensional structural diagram of an external mixing structure for a two-component spray gun according to the present invention. Figure 2 ;

[0030] Figure 6 This is a schematic diagram of the explosive structure of an external mixing structure for a two-component spray gun according to the present invention. Figure 2 ;

[0031] Figure 7 This is a three-dimensional structural diagram of the spray gun body in the external mixing structure of a two-component spray gun according to the present invention. Figure 1 ;

[0032] Figure 8 This is a three-dimensional structural diagram of the spray gun body in the external mixing structure of a two-component spray gun according to the present invention. Figure 2 ;

[0033] Figure 9 This is a three-dimensional structural diagram of the feeding adapter in the external mixing structure of a two-component spray gun according to the present invention.

[0034] Figure 10 This is a three-dimensional structural diagram of a disposable plastic mixing tube in the external mixing structure of a two-component spray gun according to this utility model. Figure 1 ;

[0035] Figure 11This is a three-dimensional structural diagram of a disposable plastic mixing tube in the external mixing structure of a two-component spray gun according to this utility model. Figure 2 ;

[0036] Figure 12 This is a cross-sectional view of a disposable plastic mixing tube in the external mixing structure of a two-component spray gun according to the present invention.

[0037] Figure 13 This is a cross-sectional view of the mixing screw in the external mixing structure of a two-component spray gun according to the present invention.

[0038] Figure 14 This is a front view schematic diagram of a disposable plastic nozzle in the external mixing structure of a two-component spray gun according to the present invention.

[0039] Figure 15 This is a three-dimensional structural diagram of a disposable plastic nozzle in the external mixing structure of a two-component spray gun according to the present invention. Figure 1 ;

[0040] Figure 16 This is a three-dimensional structural diagram of a disposable plastic nozzle in the external mixing structure of a two-component spray gun according to the present invention. Figure 2 . Detailed Implementation

[0041] The present invention will be described in detail below through specific embodiments to enable a better understanding of the present invention. However, the following embodiments do not limit the scope of the present invention.

[0042] In some embodiments, to meet the current construction requirements of two-component materials mixed externally, and to overcome the problem of uneven mixing in the air caused by the spray gun clogging due to excessively rapid material reaction, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The present invention provides an external mixing structure for a two-component spray gun, comprising a spray gun body 100, a feeding adapter 200, a disposable plastic mixing tube 300, a mixing screw 400, and a disposable plastic nozzle 500. The disposable plastic mixing tube 300 and / or the disposable plastic nozzle 500 are disposable consumable parts made of plastic, which can be quickly replaced without subsequent cleaning. At the same time, the disposable plastic mixing tube 300 and the mixing screw 400 are used to fully mix the A and B materials externally, avoiding the problem of the spray gun being blocked due to the material reacting too quickly.

[0043] This external mixing structure for a two-component spray gun is a professional spraying device. Its significant feature is its ability to simultaneously process component A and component B, which are mixed at the nozzle through a plastic mixing tube. It is mainly composed of a spray gun body 100, a feed adapter 200, a disposable plastic mixing tube 300, a mixing screw 400, and a disposable plastic nozzle 500, all assembled as a single unit. Its key feature is its ability to simultaneously process component A and component B, which are thoroughly mixed at the nozzle through the disposable plastic mixing tube by the mixing screw, and then atomized and sprayed from the disposable plastic nozzle.

[0044] The disposable plastic mixing tube 300 and / or disposable plastic nozzle 500 are made of transparent or opaque plastic material, preferably transparent plastic material with good light transmittance and other physical properties, so as to facilitate real-time observation of the material mixing and conveying status. For example, the transparent material is made of polystyrene PS, polycarbonate PC or polymethyl methacrylate PMMA, also known as plexiglass or acrylic.

[0045] Specifically, the feed adapter 200 serves as a connecting component between the disposable plastic mixing tube 300 and the spray gun body 100. Its two rear feed ports are respectively connected to the first discharge connector 101 and the second discharge connector 102 at the front end of the spray gun body 100, and its front discharge port is Y-shapedly connected to the two rear feed ports. The feed adapter 200 serves two purposes: firstly, it is used to install the disposable plastic mixing tube 300; secondly, it serves as a conveying channel for the A and B components, allowing materials from the A and B storage tanks installed on the spray gun body 100 to be simultaneously introduced into the feed adapter 200.

[0046] The disposable plastic mixing tube 300 serves as the mixing chamber for the AB two-component materials. It has a hollow tubular structure with a certain length, providing sufficient transport channels for the AB two-component mixing reaction, thereby extending the mixing reaction time. The rear end of the disposable plastic mixing tube 300 is detachably connected to the outlet at the front end of the feed adapter 200, and its front end is detachably connected to the disposable plastic nozzle 500. The mixing screw 400 is movably disposed within the chamber. The front and rear ends are respectively connected to the feed adapter 200 and the disposable plastic nozzle 500 to form a material transport path.

[0047] The disposable plastic mixing tube 300 is designed separately from the spray gun body 100, and works in conjunction with the mixing screw 400 inside the cavity to thoroughly mix the A and B two-component materials, solving the problem of uneven mixing in the air outside the gun in existing technologies. The disposable plastic mixing tube 300 is made of plastic, making it a disposable product with low production costs and easy for users to replace and clean. Furthermore, the internal spiral mixing mechanism of the plastic mixing tube ensures uniform material mixing and can accommodate materials of varying viscosities.

[0048] The disposable plastic nozzle 500 is an atomizing nozzle structure used to receive the AB two-component material after it has been fully stirred and mixed by the mixing screw 400 in the feeding adapter 200. It has an atomizing nozzle 503 at its front end, and the air inlet 505 at its lower end is connected to a high-pressure air source through a hose to achieve uniform atomization spraying of the AB two-component material through high-pressure gas.

[0049] The disposable plastic nozzle 500 has a T-shaped structure, and the nozzle adapter 502 at its rear end can be detachably connected to the disposable plastic mixing tube 300. The detachable connection method makes it convenient for users to replace and clean the disposable plastic nozzle 500 and / or the disposable plastic mixing tube 300.

[0050] In some of these embodiments, such as Figure 7 and Figure 8 As shown, to ensure the stability and durability of the external mixing two-component spray gun, the spray gun body 100 is made of metal, preferably high-quality 403 or 416 stainless steel, which has excellent corrosion resistance and wear resistance, ensuring that the spray gun can maintain stable performance during long-term use.

[0051] The front end of the spray gun body 100 is provided with a first discharge connector 101 and a second discharge connector 102 arranged side by side, and the rear ends of the first discharge connector 101 and the second discharge connector 102 are respectively provided with a first material connector 103 and a second material connector 104 arranged vertically. The first material connector 103 and the second material connector 104 are connected to storage tank A and storage tank B to provide material A and material B to the spray gun.

[0052] The spray gun body 100 is also provided with a gun needle 105, a connecting rod 106, a trigger 108, and a gun handle 109. The gun needle 105, connecting rod 106, and trigger 108 constitute the firing mechanism of the spray gun. Its specific structure and working principle are conventional technologies and will not be described in detail here. Specifically, there are two gun needles 105, which are symmetrically installed on the left and right sides of the spray gun body 100, respectively. Their front ends are respectively installed in the inner cavities of the first discharge connector 101 and the second discharge connector 102, and their rear ends are detachably connected to the end of the connecting rod 106. The top end of the trigger 108 is hinged to the middle of the spray gun body 100 and is arranged opposite to the gun handle 109 located at the rear end of the spray gun body 100. The connecting rod 106 is movably inserted through the through hole at its upper end.

[0053] In use, hold the trigger 108 and the gun handle 109, and manually move the trigger 108. The horizontally arranged connecting rod 106 will simultaneously drive the gun needles 105 at both ends, thereby connecting the first material connector 103 with the first discharge connector 101 and the second material connector 104 with the second discharge connector 102. Then, the materials in storage tanks A and B are fed into the first discharge connector 101 and the second discharge connector 102, realizing the external mixing of the A and B dual-component materials.

[0054] In addition, such as Figure 7 and Figure 8 As shown, the rear end of the needle 105 passes through the through hole at the end of the connecting rod 106 and is adjustablely mounted on the connecting rod 106 using a rotating nut 107. By adjusting the position of the rotating nut 107 at the rear end of the needle 105, the magnitude of the forward and backward displacement of the needle 105 can be adjusted, thereby controlling the size of the opening between the front end of the needle 105 and the first discharge connector 101 and the second discharge connector 102, and thus easily controlling the conveying amount of AB materials.

[0055] In some of these embodiments, such as Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 9 As shown, the feeding adapter 200 is an isosceles triangle with a Y-shaped feeding channel inside. The left and right feed inlets at the rear end of the Y-shaped feeding channel are respectively provided with a first connecting joint 201 and a second connecting joint 202 with internal threads, and the discharge outlet at the front end is provided with a third connecting joint 203 with external threads.

[0056] It is worth noting that, such as Figure 9 As shown, the third connecting joint 203 serves as the outlet at the front end of the feed adapter 200. This outlet is divided into two independent semi-circular channels: a first material conveying outlet 2031 and a first material conveying outlet 2032. The first material conveying outlet 2031 connects to the first connecting joint 201, and the first material conveying outlet 2032 connects to the second connecting joint 202. The two-component materials A and B do not come into contact within the feed adapter 200, ensuring that the entire spray gun body will not experience blockage due to excessively rapid material curing. This guarantees continuous spraying and easy cleaning of the spray gun.

[0057] Specifically, storage tanks A and B respectively send materials A and B into the Y-shaped feeding channel through the two inlets at the rear end of the feeding adapter 200 via the first connecting joint 201 and the second connecting joint 202. The materials then converge at the first material conveying outlet 2031 and the first material conveying outlet 2032 at the front end of the Y-shaped feeding channel, and then enter the disposable plastic mixing tube 300 to achieve full mixing of materials A and B.

[0058] In some of these embodiments, such as Figure 10 , Figure 11 and Figure 12 As shown, the disposable plastic mixing tube 300 is a hollow tubular structure, which mainly includes a hollow 301, a rear connecting part 302 and a head tapered part 303 arranged coaxially and connected as one piece. The hollow 301, the rear connecting part 302 and the head tapered part 303 are integrally injection molded.

[0059] Specifically, the diameter of the hollow tube 301 is smaller than the diameter of the rear connecting part 302, and at least two reinforcing ear plates 304 arranged circumferentially at the connection between its rear end and the outer periphery of the rear connecting part 302 are provided; the head end tapered part 303 is a slender tapered tube structure with a gradually changing diameter, or a tapered tube structure with external anti-slip texture, or a tapered tube structure with a slender front end outlet, and the diameter of the head end tapered part 303 is smaller than the diameter of the hollow tube 301, and the connection between the two is smooth.

[0060] To facilitate the installation and disassembly of the disposable plastic mixing tube 300 with the front and rear feed adapters 200 and the disposable plastic nozzle 500, an external thread 305 is provided on the outer periphery of the front end of the hollow tube 301 to be detachably connected to the disposable plastic nozzle 500, and an internal thread is provided on the inner wall of the rear end of the rear end connection 302 to be detachably connected to the front end of the feed adapter 200.

[0061] In some of these embodiments, such as Figure 2 , Figure 4 , Figure 6 and Figure 13 As shown, the mixing screw 400 is a spiral agitator with several spiral blades, which are arranged at equal intervals. The mixing screw 400 is made of polymer plastic or metal, and has a certain degree of structural stability and durability.

[0062] In some of these embodiments, such as Figure 14 , Figure 15 and Figure 16 As shown, a plastic nozzle is specially designed for easy replacement and cleaning by the user, and is connected to the end of a detachable plastic mixing tube. The disposable plastic nozzle 500 includes a nozzle intermediate tube 501, a nozzle adapter 502, and an atomizing nozzle 503, which are coaxially arranged and connected as one unit. The nozzle intermediate tube 501 is a tapered tube structure with one end larger than the other. Its rear end is detachably and sealed to the front end of the feed adapter 200 through the nozzle adapter 502, and its front end is connected to the atomizing nozzle 503.

[0063] In addition, the disposable plastic nozzle 500 is equipped with an air inlet connector 505. The air inlet connector 505 has an L-shaped structure, with its top end connected to the rear end of the nozzle's intermediate tube 501. Its inlet end serves as an atomizing air inlet, allowing high-pressure gas to be introduced to achieve uniform atomization spraying of the material. If necessary, a one-way valve 504 is provided on the air inlet connector 505 to prevent material from entering the atomizing air inlet from the nozzle's intermediate tube 501.

[0064] This disposable plastic spray head 500 connects to an external pneumatic drive system via an air inlet connector 505. The external pneumatic drive system provides a high-pressure air source, allowing the two-component mixture to be sprayed out under pressure. Operation is simple, and the spraying effect is uniform. Users can easily control the spray flow and coverage area by simply adjusting the air pressure. The pneumatic drive system can be a high-pressure air tank or an air compressor unit.

[0065] The specific embodiments of this utility model have been described in detail above, but they are merely examples, and this utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to this utility model are also within the scope of this utility model. Therefore, all equivalent changes and modifications made without departing from the spirit and scope of this utility model should be covered within the scope of this utility model.

Claims

1. An external mixing structure for a two-component spray gun, characterized in that, The device includes a feed adapter (200), a disposable plastic mixing tube (300), a mixing screw (400), and a disposable plastic nozzle (500). The rear end of the disposable plastic mixing tube (300) is detachably connected to the outlet of the front end of the feed adapter (200), and its front end is detachably connected to the disposable plastic nozzle (500). The mixing screw (400) is movably arranged inside the cavity. The disposable plastic nozzle (500) has a T-shaped structure. The nozzle adapter (502) at its rear end is detachably connected to the disposable plastic mixing tube (300). Its front end is provided with an atomizing nozzle (503), and its lower end air inlet connector (505) is connected to a high-pressure air source through a hose.

2. The external mixing structure for a two-component spray gun according to claim 1, characterized in that, The two feed ports at the rear end of the feed adapter (200) are respectively connected to the first discharge connector (101) and the second discharge connector (102) at the front end of the spray gun body (100), and the discharge port at the front end is connected to the two feed ports at the rear end in a Y-shape.

3. The external mixing structure for a two-component spray gun according to claim 1, characterized in that, The disposable plastic mixing tube (300) and / or disposable plastic nozzle (500) are both made of transparent polystyrene (PS), polycarbonate (PC) or polymethyl methacrylate (PMMA).

4. The external mixing structure for a two-component spray gun according to claim 1, characterized in that, The disposable plastic mixing tube (300) includes a hollow tube body (301) arranged coaxially and connected as a whole, a rear end connecting part (302) and a head end tapered part (303). The diameter of the hollow tube body (301) is smaller than the diameter of the rear end connecting part (302), and at least two reinforcing ear plates (304) arranged circumferentially at intervals are provided at the connection between its rear end and the outer periphery of the rear end connecting part (302).

5. The external mixing structure for a two-component spray gun according to claim 4, characterized in that, The head-end tapered portion (303) is a slender tapered tube structure with a gradually changing diameter, or a tapered tube structure with external anti-slip texture, or a tapered tube structure with a slender outlet at the front end, and the diameter of the head-end tapered portion (303) is smaller than the diameter of the hollow tube (301), and the connection between the two is smooth.

6. The external mixing structure for a two-component spray gun according to claim 5, characterized in that, The outer periphery of the front end of the hollow tube (301) is provided with an external thread (305) that can be detachably connected to the disposable plastic nozzle (500), and the inner wall of the rear end of the rear end connection part (302) is provided with an internal thread that can be detachably connected to the front end of the feed adapter (200).

7. The external mixing structure for a two-component spray gun according to claim 1, characterized in that, The mixing screw (400) is a spiral agitator with several spiral blades, and the several spiral blades are arranged at equal intervals.

8. The external mixing structure for a two-component spray gun according to claim 1, characterized in that, The disposable plastic nozzle (500) includes a nozzle intermediate tube (501), a nozzle adapter (502), and an atomizing nozzle (503) arranged coaxially and connected as a single unit, wherein: The nozzle intermediate tube (501) is a tapered tube structure with one end larger than the other. Its rear end is detachably and sealed to the front end of the feed adapter (200) through the nozzle adapter (502), and the front end is connected to the atomizing nozzle (503).

9. The external mixing structure for a two-component spray gun according to claim 8, characterized in that, The nozzle intermediate tube (501) is provided with an air inlet connector (505) connected to its rear end, and the air inlet connector (505) is connected to an external air pressure drive system.

10. The external mixing structure for a two-component spray gun according to claim 9, characterized in that, The air intake connector (505) has an L-shaped structure and a one-way valve (504) is installed on it.

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