Portable two-component polyurethane spray gun

Abstract

The invention discloses a portable two-component polyurethane spray gun, which belongs to the technical field of polyurethane spray guns and comprises a spray gun body, a trigger locking mechanism used for limiting rotation of a trigger of the spray gun body, an anti-diffusion cover arranged outside a spray head of the spray gun body in a covering manner, and a clamping mounting part used for detachably mounting the anti-diffusion cover outside the spray head. According to the technical scheme, when the spray gun is not used, the rotating operation strip is rotated to the designated position, the arc-shaped strip is clamped by the limiting strip, at the moment, a spray gun trigger cannot be pulled, the trigger is prevented from being touched by mistake, meanwhile, the anti-diffusion cover is arranged on the head of the spray gun, negative pressure can be generated in the anti-diffusion cover under the influence of an external air pump, and the floating mist polyurethane is adsorbed; in addition, the rotation operation strip is rotated to the designated position, the fixing effect of the clamping installation piece on the anti-diffusion cover is invalid, the anti-diffusion cover can be conveniently detached, and replacement or cleaning is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of polyurethane spray guns, and specifically to a portable two-component polyurethane spray gun. Background Art

[0002] Polyurethane adhesive (PU adhesive) is an adhesive containing urethane groups or isocyanate groups in the molecular chain, which is obtained by reacting isocyanate with hydroxyl-containing compounds such as polyester, polyether, castor oil or other polyols. Two-component polyurethane adhesives usually consist of two components, namely component A and component B. They can be prepared in a certain proportion before use. Component A (main agent) is a component containing active hydrogen, and component B (curing agent) is a polyurethane prepolymer component containing -NCO groups. It belongs to a reactive adhesive, and the two components are mixed to undergo a cross-linking reaction and cure for bonding. When in use, it usually uses a spray gun to attach the pressurized mist to the surface of an object, thereby facilitating the bonding work.

[0003] The invention with the publication number CN116899773A is a polyurethane-polyurea spray gun, which includes a rear gun body, a connecting handle, and a front gun body. A mixing chamber is movably connected inside the front gun body, and a mixing cavity is provided inside the mixing chamber. There are also 2 second feeding channels communicating with the mixing cavity inside the front gun body. A feeding block is installed on the upper part of the front gun body, a ball valve and a columnar filter screen are installed on the top of the feeding block. A first blind hole is provided inside the filter screen, and the opening of the first blind hole communicates with the second feeding channel. Multiple rows of filter holes for communicating the first blind hole and the first feeding channel are provided on the side of the filter screen, and a screen for filtering that covers the filter holes is provided outside the filter holes. The installation space of the filter screen of this invention is larger, and multiple rows of filter holes can be set for the filter holes of the filter screen to avoid clogging of the filter holes.

[0004] When the above spray gun is in operation, the misty polyurethane is ejected by pressing the trigger, and the spraying stops when the trigger is not pressed. When spraying work is not carried out, this method is prone to accidental touch situations. For example, if the worker's hand accidentally exerts force or the spray gun drops and the trigger is pressed, it will cause the spray gun to work in a non-working state. In addition, when spraying misty polyurethane, inevitably, a small part of the mist will not adhere to the surface of the object and float in the air, which will pollute the working environment and bring inconvenience to the user. Especially in a windy environment, the above adverse effects will be further aggravated. Therefore, in view of the above problems, a portable two-component polyurethane spray gun is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a portable two-component polyurethane spray gun, which is provided with a rotatable trigger locking mechanism. When the spray gun is not in use, the spray gun trigger can be locked by the trigger locking mechanism to avoid the trigger being accidentally touched. At the same time, an anti-diffusion cover is provided on the head of the spray gun, and negative pressure can be generated inside the cover under the influence of an external air pump to adsorb the floating misty polyurethane to avoid it from diffusing in the air and causing adverse effects. In addition, rotating the trigger locking mechanism to a specified position can also make the fixing effect of the clamping mounting part on the anti-diffusion cover invalid, so that the anti-diffusion cover can be easily removed for replacement or cleaning, thereby solving the technical problems in the prior art that the spray gun is prone to accidental trigger touching and the mist floating out during use will cause adverse effects.

[0006] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0007] A portable two-component polyurethane spray gun comprises a spray gun body, a trigger locking mechanism for limiting the rotation of the trigger of the spray gun body, an anti-diffusion cover arranged outside the spray head of the spray gun body, and a clamping mounting piece for detachably mounting the anti-diffusion cover outside the spray head, wherein the trigger locking mechanism comprises an articulated seat, a rotation operating strip is rotatably provided on the articulated seat, a limit strip is provided on the inner side of the rotation operating strip, an arc strip is provided outside the trigger of the spray gun body, and the spacing between the limit strips is numerically equal to the width of the arc strip.

[0008] Through the above-mentioned structural form, when the spray gun is not in use, the rotating operation bar is rotated to the specified position so that the limit bar clamps the arc bar. At this time, the spray gun trigger cannot be pulled, which can avoid the situation where the trigger is accidentally triggered; at the same time, an anti-diffusion cover is provided on the head of the spray gun, and its interior can generate negative pressure under the influence of an external air pump, which has an adsorption effect on the floating mist-like polyurethane to prevent it from diffusing in the air and causing adverse effects; in addition, rotating the rotating operation bar to the specified position can also make the fixing effect of the clamping mounting part on the anti-diffusion cover invalid, so that the anti-diffusion cover can be easily removed for replacement or cleaning.

[0009] In one possible implementation, the anti-diffusion cover includes an outer cover, on the back of which fasteners and inserts are fixedly arranged, a magnetic inner ring, which is arranged on the inner wall of the outer cover, a front cover plate, which is adsorbed and fixed on the magnetic inner ring and has a plurality of absorption holes, and an air pipe interface, which is arranged on the outer cover and connected to an external air pump pipeline, wherein a negative pressure zone is enclosed between the outer cover and the front cover plate, and the air pipe interface is connected to the negative pressure zone.

[0010] With the above structural form, the external air pump can form a negative pressure in the negative pressure area through the air pipe interface, and the scattered fog-like polyurethane can be sucked and collected by the suction holes, preventing it from diffusing in the working environment. In addition, the front cover plate and the outer cover are detachably connected through the inner magnetic ring, which facilitates the disassembly and replacement of the front cover plate alone.

[0011] In a possible implementation manner, the clamping and mounting member includes a C-shaped mounting frame fixedly arranged on both sides of the front part of the spray gun body, and grooves are provided on both the upper and lower sides thereof; a resetable hinge member fixedly arranged on the spray gun body, and a strip-shaped clamping member is rotatably connected thereto, wherein the front end of the strip-shaped clamping member is located in the groove on the upper side of the C-shaped mounting frame, and the buckling member can cover the outside of the C-shaped mounting frame and can be snap-connected with the strip-shaped clamping member.

[0012] With the above structural form, after the buckling member covers the C-shaped mounting frame, the buckling member and the strip-shaped clamping member are mutually clamped, and at this time the buckling member is fixed on the C-shaped mounting frame, thereby completing the fixed installation of the anti-diffusion cover as a whole.

[0013] In a possible implementation manner, the strip-shaped clamping member includes an inclined strip, a clamping head is arranged at the front end of the inclined strip, and a limiting groove is provided on the clamping head.

[0014] With the above structural form, a clamping effect can be achieved through the clamping action between the clamping head and the buckling member, and the structural form of the inclined strip can facilitate the rotation of the operation bar to press down the inclined strip during rotation, so that the clamping head is separated from the buckling member.

[0015] In a possible implementation manner, a retaining piece is fixedly arranged in the groove on the upper side of the C-shaped mounting frame, and the thickness of the retaining piece is numerically the same as the depth of the limiting groove.

[0016] With the above structural form, the outermost position of the clamping head can be limited to prevent it from protruding outwards excessively and causing the buckling member to be unable to be inserted.

[0017] In a possible implementation manner, the resetable hinge member includes a mounting end piece mounted on the spray gun body, a rotating shaft fixedly connected to the end of the inclined strip and rotatably connected to the mounting end piece, and a torsion spring sleeved outside the rotating shaft, and one end of the torsion spring is fixedly connected to the mounting end piece and the other end is fixedly connected to the rotating shaft.

[0018] With the above structural form, a torque can be applied to the inclined strip by the torsion spring to make it rotate outwards, ensuring that the clamping head can always be in the outermost position and generating a mutual clamping action with the buckling member without external force intervention.

[0019] In a possible implementation, a locking position limit plate is fixedly provided on the side of the spray gun body. When the rotating operation bar contacts the locking position limit plate, the rotating operation bar is in a horizontal state, and at this time the limit bar is clamped outside the arc bar.

[0020] The above-mentioned structural form can restrict the rotation range of the rotation operation bar, thus facilitating the operation of the user.

[0021] In a possible implementation, a working position limiter is fixedly provided on the side of the spray gun body, and the working position limiter includes a connecting base plate, a sliding rod is fixedly provided on the connecting base plate, a sliding plug plate is slidably sleeved on the sliding rod, and a limiting slot is provided at the end of the rotating operation strip.

[0022] Through the above-mentioned structural form, when the rotating operating bar rotates so that the limit bar no longer constrains the arc bar, the position of the rotating operating bar can be fixed by inserting the sliding plug plate into the limit slot to prevent it from rotating and resetting under the action of gravity, thereby affecting the normal pulling of the trigger.

[0023] In a possible implementation, a paddle is fixedly provided on the rotating operation bar, and an extrusion groove is provided on the inner side thereof.

[0024] With the above-mentioned structural form, the user can use the paddle to easily poke the rotating operation strip, and the extruded groove can reduce the friction between the rotating operation strip and the oblique strip, thereby improving the smoothness of the operation.

[0025] In a possible implementation, a centrally arranged convex ring is fixedly provided on the front end surface of the front cover plate, and a rubber ring is fixedly sleeved on the convex ring.

[0026] With the above-mentioned structural form, the convex ring can facilitate the user to take out the front cover plate as a whole.

[0027] In a possible implementation, both upper and lower ends of the inner side surface of the limiting strip are processed with rounded corners, and both upper and lower ends of the arc strip are processed with rounded corners.

[0028] The above-mentioned structural form can avoid the situation where the limiting bar and the arc-shaped bar collide when the limiting bar rotates outside the arc-shaped bar.

[0029] In summary, the present invention includes the following beneficial technical effects:

[0030] When the spray gun is not in use, rotate the rotation operation bar to a specified position so that the limit bar clamps the arc bar. At this time, the trigger of the spray gun cannot be pulled, which can avoid accidental trigger; at the same time, the head of the spray gun is provided with an anti-diffusion cover, and a negative pressure can be generated inside it under the influence of an external air pump to adsorb the scattered fog-like polyurethane and prevent it from diffusing in the air and causing adverse effects; in addition, rotating the rotation operation bar to the specified position can also make the clamping and installation part lose its fixing effect on the anti-diffusion cover, so that the anti-diffusion cover can be easily removed for replacement or cleaning. Brief Description of the Drawings

[0031] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0032] In the drawings:

[0033] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 is a schematic diagram of the trigger locking mechanism structure of the present invention;

[0035] Figure 3 is a schematic diagram of the anti-diffusion cover structure of the present invention;

[0036] Figure 4 is a schematic diagram of the clamping and installation part structure of the present invention;

[0037] Figure 5 is a schematic diagram of the partial structure of the present invention;

[0038] Figure 6 is a schematic diagram of the rotation operation bar structure of the present invention.

[0039] In the figure: 1. Spray gun body; 2. Trigger locking mechanism; 21. Hinge seat; 22. Rotation operation bar; 221. Dial; 222. Limit card slot; 223. Extrusion groove; 23. Arc bar; 24. Limit bar; 25. Locking position limit plate; 26. Working position limit part; 261. Connecting bottom plate; 262. Slide bar; 263. Sliding plug board; 3. Anti-diffusion cover; 31. Outer cover; 321. Buckling part; 322. Insert bar; 33. Magnetic inner ring; 34. Front cover plate; 341. Absorption hole; 342. Convex ring; 35. Air pipe interface; 4. Clamping and installation part; 41. C-shaped installation frame; 411. Flap; 42. Resettable hinge part; 421. Installation end piece; 422. Rotation shaft; 423. Torsion spring; 43. Strip-shaped clamping part; 431. Inclined strip; 432. Clamping head; 433. Limit slot. Detailed Embodiment

[0040] The technical solution in the embodiments of the present application for solving the problems in the above background technology has the following general idea:

[0041] As Figure 1 shown, a portable two-component polyurethane spray gun provided in this embodiment includes a spray gun body 1, a trigger locking mechanism 2 for restricting the rotation of the trigger of the spray gun body 1, a diffusion prevention cover 3 covering the nozzle of the spray gun body 1, and a clamping installation part 4 for detachably installing the diffusion prevention cover 3 outside the nozzle. With the above structural form, when the spray gun is not in use, rotate the trigger locking mechanism 2 to a specified position to limit the trigger, so that the spray gun trigger cannot be pulled, which can avoid the situation of accidental trigger. At the same time, a diffusion prevention cover 3 is provided at the head of the spray gun, and a negative pressure can be generated inside it under the influence of an external air pump to adsorb the scattered fog-like polyurethane and prevent it from diffusing in the air and causing adverse effects. In addition, rotating the trigger locking mechanism 2 to a specified position can also make the fixing effect of the clamping installation part 4 on the diffusion prevention cover 3 ineffective, so that the diffusion prevention cover 3 can be easily removed for replacement or cleaning.

[0042] As Figure 2 shown, the trigger locking mechanism 2 includes a hinge seat 21, a rotating operation bar 22 rotatably provided on the hinge seat 21, a limiting bar 24 provided on the inner side of the rotating operation bar 22, and an arc bar 23 provided outside the trigger of the spray gun body 1. The distance between the limiting bars 24 is numerically equal to the width of the arc bar 23. With the above structural form, when the spray gun is not in use, rotate the rotating operation bar 22 to a specified position so that the limiting bars 24 clamp the arc bar 23, and at this time the spray gun trigger cannot be pulled, which can avoid the situation of accidental trigger.

[0043] As Figure 3 shown, the diffusion prevention cover 3 includes an outer cover 31, a buckling part 321 and an insertion bar 322 fixedly provided on the back of the outer cover 31, a magnetic inner ring 33 provided on the inner wall of the outer cover 31, a front cover plate 34 adsorbed and fixed on the magnetic inner ring 33, and a plurality of absorption holes 341 opened on the front cover plate 34. An air pipe interface 35 is provided on the outer cover 31 and is connected to the pipeline of an external air pump. Among them, a negative pressure area is formed by enclosing between the outer cover 31 and the front cover plate 34, and the air pipe interface 35 is communicated with the negative pressure area. With the above structural form, the external air pump can form a negative pressure in the negative pressure area through the air pipe interface 35, and the scattered fog-like polyurethane can be sucked and collected through the absorption holes 341 to prevent it from diffusing in the working environment. In addition, the front cover plate 34 and the outer cover 31 are detachably connected through the magnetic inner ring 33, which can facilitate the separate disassembly and replacement of the front cover plate 34.

[0044] As Figure 4As shown in the figure, the snap-in mounting member 4 includes a C-shaped mounting frame 41 which is fixedly arranged on both sides of the front part of the spray gun body 1, and slots are formed on both the upper and lower sides thereof. A reset hinge member 42 is fixedly arranged on the spray gun body 1, and a strip-shaped clamping member 43 is rotatably connected thereto. Among them, the front end of the strip-shaped clamping member 43 is located in the slot on the upper side of the C-shaped mounting frame 41. The buckling member 321 can cover the outside of the C-shaped mounting frame 41 and can be snap-connected with the strip-shaped clamping member 43. Through the above structural form, when the buckling member 321 covers the C-shaped mounting frame 41, the buckling member 321 and the strip-shaped clamping member 43 are snap-connected to each other. At this time, the buckling member 321 is fixed on the C-shaped mounting frame 41, and thus the overall fixing and installation of the anti-diffusion cover 3 is completed.

[0045] Among them, the strip-shaped clamping member 43 includes an inclined strip 431. A clamping head 432 is arranged at the front end of the inclined strip 431, and a limiting slot 433 is formed on the clamping head 432. Through the above structural form, a clamping effect can be generated between the clamping head 432 and the buckling member 321 to achieve a fixing effect. The structural form of the inclined strip 431 can facilitate the downward pressing of the inclined strip 431 by the rotating operation bar 22 during rotation to make it rotate, so that the clamping head 432 is separated from the buckling member 321.

[0046] In addition, a retaining piece 411 is fixedly arranged in the slot on the upper side of the C-shaped mounting frame 41. The thickness of the retaining piece 411 is numerically the same as the depth of the limiting slot 433. Through the above structural form, the outermost position of the clamping head 432 can be limited to prevent it from protruding excessively outward, resulting in the inability of the buckling member 321 to be inserted.

[0047] As Figure 4 shown, the reset hinge member 42 includes a mounting end piece 421 which is mounted on the spray gun body 1, a rotating shaft 422 which is fixedly connected to the end of the inclined strip 431 and is rotatably connected to the mounting end piece 421, and a torsion spring 423 which is sleeved outside the rotating shaft 422, and one end of the torsion spring 423 is fixedly connected to the mounting end piece 421, and the other end is fixedly connected to the rotating shaft 422. Through the above structural form, a torque can be applied to the inclined strip 431 by the torsion spring 423 to make it rotate outward, ensuring that the clamping head 432 can always be in the outermost position and generate a mutual clamping effect with the buckling member 321 without external force intervention.

[0048] As Figure 2 shown, a locking position limiting plate 25 is fixedly arranged on the side of the spray gun body 1. When the rotating operation bar 22 contacts the locking position limiting plate 25, the rotating operation bar 22 is in a horizontal state, and at this time, the limiting strip 24 is clamped outside the arc-shaped strip 23. Through the above structural form, the rotation range of the rotating operation bar 22 can be restricted, which is convenient for the user's operation.

[0049] As Figure 5As shown, a working position limiter 26 is fixedly provided on the side of the spray gun body 1, and the working position limiter 26 includes a connecting base plate 261, on which a slide rod 262 is fixedly provided, and a sliding plug plate 263 is slidably sleeved on the slide rod 262. In addition, a limiting slot 222 is provided at the end of the rotating operation bar 22. Through the above-mentioned structural form, when the rotating operation bar 22 is rotated so that the limiting bar 24 no longer constrains the arc bar 23, the position of the rotating operation bar 22 can be fixed by inserting the sliding plug plate 263 into the limiting slot 222, so as to prevent it from rotating and resetting under the action of gravity, thereby affecting the normal pulling of the trigger.

[0050] like Figure 2 , Figure 6 As shown, a paddle 221 is fixedly provided on the rotating operation bar 22, and an extrusion groove 223 is provided on its inner side. Through the above-mentioned structural form, the paddle 221 can facilitate the user to paddle the rotating operation bar 22, and the extrusion groove 223 can reduce the friction between the rotating operation bar 22 and the inclined bar 431, thereby improving the smoothness of the operation.

[0051] like Figure 3 As shown, a centrally arranged convex ring 342 is fixedly provided on the front end surface of the front cover plate 34, and a rubber ring is fixedly sleeved on the convex ring 342. Through the above-mentioned structural form, the convex ring 342 can facilitate the user to take out the front cover plate 34 as a whole.

[0052] like Figure 6 As shown, both upper and lower ends of the inner side of the limit bar 24 are processed with rounded corners, and both upper and lower ends of the arc bar 23 are processed with rounded corners. Through the above-mentioned structural form, it is possible to avoid collision between the limit bar 24 and the arc bar 23 when the limit bar 24 rotates to the outside of the arc bar 23.

[0053] The use principle and use process of the present invention:

[0054] When the spray gun is not in use, the rotating operating bar 22 is rotated until it contacts the locking position limit plate 25, and the rotating operating bar 22 is in a horizontal state. At this time, the limit bar 24 is clamped outside the arc bar 23, so that the limit bar 24 clamps the arc bar 23, and the spray gun trigger cannot be pulled, which can avoid the situation of accidental triggering.

[0055] At the same time, an anti-diffusion cover 3 is provided on the head of the spray gun, and a negative pressure area is formed between the outer cover 31 and the front cover plate 34. The external air pump can form negative pressure in the negative pressure area through the air pipe interface 35, and the floating mist polyurethane can be sucked and collected by the absorption hole 341 to prevent it from diffusing in the working environment. In addition, the front cover plate 34 and the outer cover 31 are detachably connected through the magnetic inner ring 33, which can facilitate the disassembly and replacement of the front cover plate 34 alone.

[0056] In addition, rotating the rotating operation bar 22 to a specified position can also invalidate the fixing effect of the clamping and mounting member 4 on the anti-diffusion cover 3, enabling the anti-diffusion cover 3 to be conveniently removed for replacement or cleaning. Specifically, during the upward rotation of the rotating operation bar 22, it can press down the inclined bar 431 to make it rotate, causing the clamping head 432 to separate from the buckling member 321, thereby facilitating the removal of the entire anti-diffusion cover 3.

[0057] Finally, it should be noted that: Obviously, the above embodiments are merely examples for clearly illustrating the present invention and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A portable two-component polyurethane spray gun, characterized in that: include: Spray gun body (1); A trigger locking mechanism (2) for limiting the rotation of the trigger of the spray gun body (1); An anti-diffusion cover (3) is arranged outside the spray head of the spray gun body (1); A clamping mounting member (4) is used to detachably mount the anti-diffusion cover (3) outside the nozzle; The trigger locking mechanism (2) comprises an articulated seat (21), a rotational operating strip (22) is rotatably provided on the articulated seat (21), a limit strip (24) is provided on the inner side of the rotational operating strip (22), an arc strip (23) is provided outside the trigger of the spray gun body (1), and the spacing of the limit strip (24) is equal to the width of the arc strip (23) in value.

2. A portable two-component polyurethane spray gun according to claim 1, characterized in that: The anti-diffusion cover (3) comprises: An outer cover (31) having a buckle (321) and an insert (322) fixedly disposed on the back side thereof; A magnetic inner ring (33) disposed on the inner wall of the outer cover (31); A front cover plate (34) is fixed on the inner ring (33) of the magnet by adsorption and has a plurality of absorption holes (341) formed thereon; An air pipe interface (35) is provided on the outer cover (31) and is connected to an external air pump pipeline; The outer cover (31) and the front cover plate (34) enclose a negative pressure zone, and the trachea interface (35) is in communication with the negative pressure zone.

3. A portable two-component polyurethane spray gun according to claim 2, characterized in that: The clamping mounting member (4) comprises: A C-shaped mounting frame (41) is fixedly arranged on both sides of the front of the spray gun body (1), and has grooves on its upper and lower sides; A repositionable hinge (42) which is fixedly arranged on the spray gun body (1) and on which a strip-shaped clamp (43) is rotatably connected; The front end of the strip clamp (43) is located in a groove on the upper side of the C-shaped mounting frame (41), and the buckle member (321) can be covered on the outside of the C-shaped mounting frame (41) and can be buckled and connected with the strip clamp (43).

4. A portable two-component polyurethane spray gun according to claim 3, characterized in that: The strip-shaped clamping member (43) comprises an inclined strip (431), a clamping head (432) is provided at the front end of the inclined strip (431), and a limiting groove (433) is provided on the clamping head (432).

5. A portable two-component polyurethane spray gun according to claim 4, characterized in that: A blocking piece (411) is fixedly arranged in the groove on the upper side of the C-shaped mounting frame (41), and the thickness of the blocking piece (411) is numerically consistent with the groove depth of the limiting groove (433).

6. A portable two-component polyurethane spray gun according to claim 4, characterized in that: The resettable hinge (42) comprises: An installation end piece (421) is installed on the spray gun body (1); A rotating shaft (422) is fixedly connected to the end of the inclined strip (431) and is rotatably connected to the mounting end piece (421); The torsion spring (423) is sleeved outside the rotating shaft (422), and one end of the torsion spring is fixedly connected to the mounting end plate (421), and the other end of the torsion spring is fixedly connected to the rotating shaft (422).

7. The portable two-component polyurethane spray gun according to claim 1, characterized in that: A locking position limiting plate (25) is fixedly arranged on the side of the spray gun body (1); when the rotating operation bar (22) contacts the locking position limiting plate (25), the rotating operation bar (22) is in a horizontal state, and at this time the limiting bar (24) is clamped outside the arc bar (23).

8. The portable two-component polyurethane spray gun according to claim 1, characterized in that: A working position limiting member (26) is fixedly arranged on the side of the spray gun body (1), and the working position limiting member (26) comprises a connecting base plate (261), a sliding rod (262) is fixedly arranged on the connecting base plate (261), and a sliding plug plate (263) is slidably sleeved on the sliding rod (262). In addition, a limiting slot (222) is provided at the end of the rotating operation strip (22).

9. The portable two-component polyurethane spray gun according to claim 1, characterized in that: A paddle (221) is fixedly arranged on the rotating operation bar (22), and an extrusion groove (223) is provided on the inner side surface thereof.

10. The portable two-component polyurethane spray gun according to claim 2, characterized in that: A centrally arranged convex ring (342) is fixedly provided on the front end surface of the front cover plate (34), and a rubber ring is fixedly sleeved on the convex ring (342).

11. The portable two-component polyurethane spray gun according to claim 1, characterized in that: The upper and lower ends of the inner side surface of the limiting strip (24) are both processed with rounded corners, and the upper and lower ends of the arc strip (23) are both processed with rounded corners.

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