A combination paint gun

Abstract

The application discloses a combined paint spraying gun, the paint spraying gun body is provided with a separable spray head, and a liquid adjusting needle is arranged on the paint spraying gun body; a connecting part on the paint spraying gun body comprises a connecting platform arranged on the paint spraying gun body and a locking ring capable of rotating in the circumferential direction relative to the connecting platform, an axial limiting structure for limiting the axial displacement of the locking ring is arranged between the connecting platform and the locking ring, the locking ring is provided with a first mechanical locking feature, and the part of the spray head towards the locking ring is provided with a second mechanical locking feature; the first mechanical locking feature and the second mechanical locking feature are combined to pull the paint spraying gun body and the spray head to form an integrated paint spraying gun. The first mechanical locking feature and the second mechanical locking feature are continuously engaged, the spray head and the paint spraying gun body are locked together, even if the second mechanical locking feature on the spray head is slightly worn, the locking ring can be continuously rotated, and the user is facilitated to quickly connect.

Description

Technical Field

[0001] This invention relates to paint spray guns, and more particularly to a combination paint spray gun. Background Technology

[0002] When repairing a vehicle after a respraying incident, spray guns are widely used in vehicle repair shops. In a known spray gun, liquid is contained in a reservoir connected to the spray gun, from where the liquid is delivered to the nozzle. Once sprayed from the nozzle, the liquid is atomized and forms a jet with the compressed air supplied to the nozzle. The liquid can be delivered by gravity, suction, or, most recently, by air pressure from a pressurized air line to the reservoir to the spray gun.

[0003] Chinese invention patent No. 201780075485.2, entitled "Spray Gun and Nozzle Assembly Attachment," uses a capture-type rotatable locking ring and a corresponding cam component to connect the paint gun and nozzle assembly. It positions the gun through an entry window and then locks the paint gun and nozzle assembly by rotating the capture-type rotatable locking ring at a certain angle. However, due to its inherent structure, the capture-type rotatable locking ring can only rotate a certain angle before it can no longer lock. If the capture-type rotatable locking ring is continuously rotated, causing the entry window to coincide with the cam lug, the capture-type rotatable locking ring and cam component will disengage, failing to complete the locking function. In actual use, the capture-type rotatable locking ring and cam structure need to be rotated repeatedly, causing wear on both the capture-type rotatable locking ring and the cam component. Since the capture-type rotatable locking ring cannot rotate continuously for locking, the nozzle assembly may fail to lock.

[0004] In particular, when the nozzle assembly is combined with the spray gun, the capture-type rotatable locking ring, cam lug and inlet window and other components need to be aligned before the capture-type rotatable locking ring is rotated to lock. That is, the capture-type rotatable locking ring needs to be reset before the locking operation can be performed. The operator needs to calibrate the operation, otherwise the locking operation between the gun body and the nozzle assembly cannot be completed, which makes the operation inconvenient.

[0005] Therefore, existing technologies need further improvement and development. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a combined paint spray gun that, while ensuring the locking strength between the paint spray gun and the nozzle, allows for convenient and quick locking operations, resulting in continuous locking and extending the service life of the paint spray gun.

[0007] To solve the above-mentioned technical problems, the present invention includes:

[0008] A combined paint spray gun includes a paint spray gun body with a detachable nozzle and a liquid adjustment needle. The nozzle has a liquid inlet and a liquid adjustment passage connected to it, and the liquid adjustment passage is adapted to the liquid adjustment needle. An air passage on the paint spray gun body is adapted to the air passage on the nozzle. The paint spray gun body has a connecting portion, including a connecting platform on the paint spray gun body, a locking ring rotatable relative to the connecting platform, and an axial limiting structure for restricting the axial displacement of the locking ring. The axial limiting structure can be located on the connecting platform, on the nozzle, or between the connecting platform and the nozzle. The locking ring has a first mechanical locking feature, and the nozzle or the connecting platform has a second mechanical locking feature adapted to the first mechanical locking feature on a corresponding portion facing the locking ring. Rotating the locking ring combines the first and second mechanical locking features, pulling the paint spray gun body and nozzle together to form an integrated paint spray gun.

[0009] The combined paint spray gun, wherein the first mechanical locking feature is an internal thread, an external thread, at least two thread segments, a number of pawls, or a number of grooves with bevels; and the second mechanical locking feature is an internal thread, an external thread, at least two thread segments, a number of pawls, or a number of grooves with bevels.

[0010] In the combined paint spray gun, the locking ring and the axial limiting structure are arranged on the connecting platform. The locking ring is provided with at least two internal thread sections, and the corresponding part of the spray head is provided with at least two external thread sections.

[0011] In the combined paint spray gun, the locking ring and the axial limiting structure are arranged at the corresponding positions of the spray head. The locking ring is provided with at least two internal thread sections, and the corresponding positions of the connecting platform are provided with at least two external thread sections.

[0012] The combined paint spray gun, wherein the aforementioned axial limiting structure includes a protruding component disposed at the corresponding location of the connecting platform or the nozzle, wherein at least the diameter of the maximum circumference of the outer edge of the protruding component is greater than the diameter of the maximum circumference of the inner edge of the blocking portion of the locking ring.

[0013] In the combined paint gun, the protruding part is a retaining ring, the front end of the connecting platform is provided with a mounting groove, the retaining ring is arranged in the mounting groove, and the connecting platform behind the mounting groove serves as the mounting position for the locking ring; the blocking part is a vertical wall extending downward from the rear end of the locking ring, and the inner wall of the part of the locking ring extending out of the connecting platform is provided with the first mechanical locking feature.

[0014] In the aforementioned combined paint spray gun, the retaining ring is a retaining spring or a clamp.

[0015] In the combined paint spray gun, the protruding part is a retaining ring, the front end of the connecting platform is provided with a mounting groove, the retaining ring is arranged in the mounting groove, and the connecting platform behind the mounting groove serves as the mounting position of the locking ring; the blocking part is the front end face of the locking ring, and the outer surface of the locking ring is provided with the first mechanical locking feature.

[0016] The combined paint spray gun, wherein the connecting platform is provided with at least two openings, and a stop is provided on the connecting platform behind the openings, the connecting platform between the stop and the openings serving as the mounting position for the locking ring; the protruding component includes a base arranged on the paint spray gun body, the outer periphery of the base extending outwards with a protruding block adapted to the opening, the protruding block extending out of the corresponding opening, the outer edge of the protruding block being located within the same circumference; the blocking part is a vertical wall extending downwards from the rear end face of the locking ring, and the inner wall of the portion of the locking ring extending out of the connecting platform is provided with the first mechanical locking feature.

[0017] The combined paint spray gun, wherein the protruding component includes a base arranged on the body of the paint spray gun, the outer periphery of which extends outward to form a retaining ring; the blocking part is a vertical wall extending downward from the rear end of the locking ring, and the inner wall of the portion of the locking ring extending outward from the connecting platform is provided with the first mechanical locking feature.

[0018] The combined paint spray gun, wherein multiple support blocks are evenly arranged on the front end face of the connecting platform, with gaps between adjacent support blocks, the front end of the support block is a wedge-shaped head, the small end of the wedge-shaped head faces the installation direction of the locking ring, the height of the large end of the wedge-shaped head is higher than the upper surface of the support block, and the height of the upper surface of the support block is lower than the maximum height of the front end face of the connecting platform, the outer edges of the large ends of the multiple wedge-shaped heads are located on the same circumference, the upper surface of the support block behind the multiple wedge-shaped heads serves as the installation position of the locking ring, and the multiple wedge-shaped heads form the aforementioned protruding component; the aforementioned blocking part is a vertical wall extending downward from the rear end face of the locking ring, and the aforementioned first mechanical locking feature is provided on the inner wall of the portion of the locking ring extending out of the connecting platform.

[0019] The combined paint spray gun is provided with a rotating handle on the outer surface of the locking ring.

[0020] This invention provides a combined paint spray gun, which uses an axial limiting structure to axially limit the locking ring, allowing the locking ring to rotate continuously relative to the connecting platform. During connection, no calibration is required; the nozzle is directly pushed into the connecting platform of the paint spray gun body, and the locking ring is quickly rotated. When the first mechanical locking feature, such as the thread or threaded segment on the locking ring, quickly engages with the corresponding second mechanical locking feature, the locking ring is further rotated to pull the nozzle and paint spray gun body together, allowing the operator to quickly connect or disconnect the nozzle and paint spray gun body.

[0021] Furthermore, as the user continuously rotates the locking ring, the first and second mechanical locking features continuously engage, locking the nozzle and the paint gun body together. With repeated use, even if the second mechanical locking feature on the nozzle shows slight wear, the locking ring can be rotated again to further engage the second mechanical locking feature. Through continuous locking force, the seal between the various air passages between the paint gun body and the nozzle can still be maintained, extending the service life of the paint gun. In addition, the locking ring of this invention is basically fixed to the paint gun body or nozzle through the axial limiting structure, preventing it from falling off and facilitating quick connection between the nozzle and the paint gun body. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the combination spray gun in this invention;

[0023] Figure 2 This is a schematic diagram showing the disassembled modular spray gun of the present invention;

[0024] Figure 3 This is a schematic diagram of the nozzle in this invention;

[0025] Figure 4 This is a cross-sectional schematic diagram of the nozzle in this invention;

[0026] Figure 5 This is a schematic diagram of the first embodiment of the present invention;

[0027] Figure 6 In this invention Figure 5 A schematic diagram of the main body of the spray gun;

[0028] Figure 7 In this invention Figure 5 Cross-sectional view of the locking ring and the connecting platform;

[0029] Figure 8 This is a front view of the locking ring in this invention;

[0030] Figure 9 This is a cross-sectional schematic diagram of the locking ring in this invention;

[0031] Figure 10 This is a schematic diagram of the second embodiment of the present invention;

[0032] Figure 11 In this invention Figure 10 A schematic diagram of the main body of the spray gun;

[0033] Figure 12 In this invention Figure 10 Cross-sectional view of the locking ring and the connecting platform;

[0034] Figure 13 In this invention Figure 10A schematic diagram of the locking ring;

[0035] Figure 14 This is a schematic diagram of the third embodiment of the present invention;

[0036] Figure 15 In this invention Figure 14 A schematic diagram of the main body of the spray gun;

[0037] Figure 16 This is a schematic diagram of the locking ring in this invention;

[0038] Figure 17 This is a schematic diagram of the fourth embodiment of the present invention;

[0039] Figure 18 This is a schematic diagram of the nozzle in this invention;

[0040] Figure 19 This is a schematic diagram of the locking ring in this invention;

[0041] Figure 20 This is a schematic diagram of the fifth embodiment of the present invention;

[0042] Figure 21 This is a schematic diagram of the nozzle in this invention;

[0043] Figure 22 This is a schematic diagram of the support block in this invention;

[0044] Figure 23 This is a schematic diagram of the locking ring in this invention;

[0045] Figure 24 This is a schematic diagram of the nozzle in the sixth embodiment of the present invention;

[0046] Figure 25 for Figure 24 A schematic diagram of the locking ring;

[0047] Figure 26 This is a schematic diagram of the seventh embodiment of the present invention;

[0048] Figure 27 This is a schematic diagram of the nozzle in the eighth embodiment of the present invention. Detailed Implementation

[0049] This invention provides a combined spray gun. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0050] This invention provides a combined paint spray gun, such as Figure 1 and Figure 2As shown, it includes a paint gun body 1, which can be made of metal casting or injection molding. The paint gun body 1 is generally equipped with a trigger, handle, air adjustment knob, liquid needle adjustment knob and various air passages to facilitate user operation. Its specific arrangement and related structure are not the focus of this invention and will not be described in detail here.

[0051] The main body 1 of the spray gun is equipped with a detachable nozzle 2, such as Figure 3 and Figure 4 As shown, the nozzle 2, also known as the nozzle assembly or spray head assembly, is generally equipped with various air passages, liquid inlets, spray caps and other components, thus providing a foundation for liquid spraying.

[0052] A liquid adjustment needle 3 is arranged on the body 1 of the paint spray gun. In this invention, "axial direction" generally refers to the centerline of the liquid adjustment needle 3 as a reference. Figure 4 As shown, the nozzle 2 is provided with a liquid inlet 4 and a liquid adjustment passage 5. The liquid inlet 4 and the liquid adjustment passage 5 are connected. The liquid adjustment passage 5 is adapted to the liquid adjustment needle 3. The liquid inlet 4 is generally provided with a connecting structure for connecting to a related fluid supply cup to provide the liquid for spraying, such as paint. Of course, the air passage on the paint gun body 1 is adapted to the air passage 6 on the nozzle 2 to provide high-pressure gas to the nozzle 2 so that the liquid is fully atomized when it leaves the nozzle 2. In particular, the paint gun body 1 of the present invention is provided with a connecting platform 7. The connecting platform 7 can be implemented in various ways. The paint gun body 1 is provided with a connecting part, which includes the connecting platform 7 arranged on the paint gun body 1, a locking ring 8 that can rotate circumferentially relative to the connecting platform 7, and an axial limiting structure for limiting the axial displacement of the locking ring, such as... Figure 5 , Figure 14 , Figure 17 and Figure 26 As shown, the axial limiting structure can be located on the connecting platform 7, on the nozzle 2, or between the connecting platform 7 and the nozzle 2. This will be described in detail in the following embodiments and will not be elaborated upon here. The locking ring 8 can be made of metal or plastic, such as… Figure 5 , Figure 14 , Figure 17 and Figure 26 As shown, the locking ring 8 and the axial limiting structure can be arranged on the connecting platform 7 or on the nozzle 2. The following focuses on describing the locking ring 8 and the axial limiting structure as being arranged on the connecting platform 7, which can be directly changed to the nozzle 2 as needed, and will not be repeated here.

[0053] In this embodiment, a locking ring 8 capable of continuous circumferential rotation is provided on the connecting platform 7, preventing the locking ring 8 from axially shifting and falling off the connecting platform 7, while still allowing continuous circumferential rotation around the connecting platform 7. An axial limiting structure is configured between the connecting platform 7 and the locking ring 8. The locking ring 8 is provided with a first mechanical locking feature 9, and the nozzle 2 is provided with a second mechanical locking feature 10 on the portion facing the locking ring 8. The liquid adjustment needle 3 is inserted into the liquid adjustment passage 5, pushing the nozzle 2 towards the connecting platform 7. That is, when the nozzle 2 and the paint gun body 1 are engaged, the continuous rotation of the locking ring 8 causes the first mechanical locking feature 9 and the second mechanical locking feature 10 to combine, for example, to continuously engage, so that the nozzle 2 and the paint gun body 1 form an integrated paint gun. Furthermore, under the continuous locking force provided by the first mechanical locking feature 9 and the second mechanical locking feature 10, the sealed state after the nozzle 2 and the paint gun body 1 are combined is also guaranteed. Of course, a positioning mechanism can be set up during the specific operation to facilitate user operation, but it is not the focus of this invention and will not be described in detail here. That is to say, when the nozzle 2 is pushed into the paint gun body 1, the relative position of the nozzle 2 and the paint gun body 1 is fixed by the positioning mechanism, and then the locking ring 8 can be continuously rotated to achieve the locking function. No calibration is required when locking, and there is no possibility of disengagement when continuously rotating the locking ring 8. Moreover, the locking ring 8 can rotate continuously. Even if the second mechanical locking feature 10 is worn, the locking ring 8 can still be rotated. Under the continuous rotation of the first mechanical locking feature 9, the worn part of the second mechanical locking feature 10 continues to engage, pulling the paint gun body 1 and the nozzle 2 to continuously lock together, maintaining the formation of an integrated paint gun while ensuring the sealing of all parts.

[0054] In a preferred embodiment of the present invention, such as Figure 2 As shown, the aforementioned axial limiting structure includes a protruding component 11 disposed on the connecting platform 7, such as... Figure 2 and Figure 25As shown, at least the diameter of the largest circumference of the outer edge 12 of the protruding member 11 is greater than the diameter of the largest circumference of the inner edge 35 of the blocking part 36 of the locking ring 8. That is to say, the protruding member 11 is fixed on the connecting platform 7 to play a limiting role. First, the locking ring 8 is installed at the corresponding position on the connecting platform 7, and then the protruding member 11 is used to fix it axially. Of course, the locking ring 8 can also be snapped into the corresponding position on the connecting platform 7 by using an elastic material inverted snapping method. The inverted snapping method prevents the locking ring 8 from falling off the connecting platform 7. Generally speaking, the connecting platform 7 behind the protruding member 11 can be used as the mounting position for the circumferential rotation of the locking ring 8. Of course, other corresponding methods can also be used to ensure that the locking ring 8 cannot fall off the connecting platform 7 and can rotate circumferentially on the connecting platform 7. When the locking ring 8 and the nozzle 2 are finally combined, the protruding member 11 also serves as a force-bearing fixing member, making the combination of the locking ring 8 and the nozzle 2 more secure. The rear or front face of the locking ring 8 is provided with a blocking part adapted to the protruding part 11. The blocking part and the protruding part 11 cooperate to form an axial limit for the locking ring 8. Alternatively, a mounting position for the locking ring 8 can be provided on the connecting platform 7, and the length of the mounting position will be slightly greater than the thickness of the blocking part, so as not to hinder the circumferential rotation of the locking ring 8. For example, when the locking ring 8 and the axial limiting structure are arranged on the connecting platform 7, the locking ring 8 can be limited by the axial limiting structure, i.e., by the protruding part 11, preventing the locking ring 8 from detaching from the front end of the connecting platform 7. The rearward displacement of the locking ring 8 can also be limited by components such as the trigger on the paint gun body 1. When the locking ring 8 and the axial limiting structure are arranged on the nozzle 2, the protruding part 11 prevents the locking ring 8 from detaching from the end of the nozzle 2 facing the connecting platform 7, while components such as the liquid inlet 4 limit the displacement of the locking ring 8 towards the liquid outlet of the nozzle 2. Alternatively, stops can be provided at corresponding locations on the connecting platform 7 and the nozzle 2 as needed, such as... Figure 14 , Figure 15 and Figure 16 The specific arrangement of the stop portion 21 shown is not detailed here, but please refer to the description in the following embodiments.

[0055] Furthermore, in another preferred embodiment of the invention, such as Figure 2 and Figure 10As shown, the first mechanical locking feature 9 can be an internal thread, an external thread, at least two thread segments, several claws, or several grooves with beveled surfaces; the second mechanical locking feature 10 can be an internal thread, an external thread, at least two thread segments, several claws, or several grooves with beveled surfaces. Since the locking ring 8 can rotate circumferentially, it can be used in various ways. More specifically: when the first mechanical locking feature 9 is an internal thread, the second mechanical locking feature 10 is an external thread; when the first mechanical locking feature 9 is an external thread, the second mechanical locking feature 10 is an internal thread. Of course, when the first mechanical locking feature 9 is an internal thread segment, the second mechanical locking feature 10 can be an external thread segment; of course, when the first mechanical locking feature 9 is an external thread segment, the second mechanical locking feature 10 is an internal thread segment; for example... Figure 24 and Figure 25 As shown, the locking ring 8 has two internal thread sections 37, and the corresponding part of the nozzle 2 has three external thread sections 38. Of course, the number of thread sections can be set according to needs. Obviously, the first mechanical locking feature 9 can also be set as a pawl adapted to the threaded bevel to achieve the above function, while the second mechanical locking feature 10 can adopt a groove or spiral groove with a bevel, such as... Figure 27 As shown, a spiral groove 39 is provided on the nozzle 2, and a corresponding claw (not shown in the figure) is configured on the locking ring 8. Of course, the claw is preferably also inclined. As the locking ring 8 rotates, the claw rotates in the spiral groove 39, tightening the paint gun body 1 and the nozzle 2. There are various variations in the combination or matching of the first mechanical locking feature 9 and the second mechanical locking feature 10, which will not be elaborated here.

[0056] To further describe the invention, as follows: Figures 5-9 As shown, the protruding component 11 is a retaining ring 12, and the front end of the connecting platform 7 is provided with a mounting groove 13. The retaining ring 12 is arranged in the mounting groove 13, and the connecting platform 7 behind the mounting groove 13 serves as the mounting position 14 of the locking ring 8; Figure 5 and Figure 6 As shown, the aforementioned blocking portion is a vertical wall 15 extending downward from the rear end face of the locking ring 8, and the aforementioned first mechanical locking feature 9 is provided on the inner wall of the portion of the locking ring 8 extending out from the connecting platform 7. In the embodiment, as... Figure 7 , Figure 8 and Figure 9 As shown, the vertical wall 15 is a ring-shaped piece that runs the entire length of the rear end face of the locking ring 8. Alternatively, multiple vertical walls 15 can form a ring-shaped catch, or only three, four, or other vertical walls 15 can be used to form a claw-like structure that engages with the rear side wall of the retaining ring 12. There are many specific forms, which will not be detailed here. Furthermore, the aforementioned retaining ring 12 can be a retaining spring or a clamp, or even a non-circular retaining spring.

[0057] In another preferred embodiment of the invention, such as Figure 10, Figure 11 , Figure 12 and Figure 13 As shown, the protruding part 11 is a retaining ring 16, and the front end of the connecting platform 7 is provided with a mounting groove 17. The retaining ring 16 is arranged in the mounting groove 17, and the connecting platform 7 behind the mounting groove 17 serves as the mounting position 18 of the locking ring. The blocking part is the front end face 19 of the locking ring 8, and the outer surface of the locking ring 8 is provided with the first mechanical locking feature 9. That is to say, the first mechanical locking feature 9 provided on the locking ring 8 is an external thread, and the connecting part of the nozzle 2 is a tube extending towards the spray gun body 1. The inner wall of the tube is provided with a second mechanical locking feature 10, that is, an internal thread. By continuously rotating the locking ring 8, the nozzle 2 is finally fixed together with the spray gun body 1 through the continuous meshing of the external thread and the internal thread.

[0058] In another preferred embodiment of the invention, such as Figure 14 , Figure 15 and Figure 16 As shown, the connecting platform 7 has at least two openings 20, and a stop 21 is provided on the connecting platform 7 behind the openings 20. The stop 21 can also be provided in the two embodiments described above, for example, on the connecting platform 7 behind the mounting grooves 13 and 17, so that the mounting positions 14 and 18 are located between the mounting grooves and the stop 21. This can better restrict the axial movement of the locking ring 8, but it will increase the processing difficulty. In the two embodiments described above, the stop 21 can be removed, and the above purpose can also be achieved by using a trigger or other components on the paint gun body 1 to block it.

[0059] like Figure 14 and Figure 15 As shown, the connecting platform 7 between the stop 21 and the opening 20 serves as the mounting position 22 for the locking ring 8; the protruding component 11 includes a base 23 arranged on the paint gun body 1. The base 23 can be arranged on the paint gun body 1 by means of bolts, clips or welding, and its specific fixing method can be arranged as needed.

[0060] The base 23 extends outward from its outer periphery with a protrusion 24 that matches the opening 20. The protrusion 24 extends outward corresponding to the opening 20, and its outer edge 35 is located within the same circumference. That is, when the base 23 is fixed to the spray gun body 1, the protrusion 24 extends outward and engages with the blocking portion on the locking ring 8, simultaneously engaging with the stop portion 21 to restrict the axial movement of the locking ring 8. Figure 16 As shown, the aforementioned blocking part is a vertical wall 25 extending downward from the rear end of the locking ring 8. The inner wall of the part of the locking ring 8 extending out of the connecting platform 7 is provided with the aforementioned first mechanical locking feature, which is generally an internal thread, and cooperates with the corresponding external thread of the nozzle 2 to realize the connection between the nozzle 2 and the spray gun body 1.

[0061] In another embodiment of the invention, such as Figure 17 , Figure 18 and Figure 19 As shown, the protruding component 11 includes a base 26 disposed on the body of the paint gun, the outer periphery of which extends outward to form a retaining ring 27; the blocking part is a vertical wall 36 extending downward from the rear end face of the locking ring 8, and the inner wall of the portion of the locking ring 8 extending outward from the connecting platform 7 is provided with the aforementioned first mechanical locking feature. The difference from the previous embodiment is that the base 26 forms an annular retaining ring, which is easier to process and eliminates the need for components such as the opening 20 on the body of the paint gun 1, thus appropriately reducing its processing cost.

[0062] In another preferred embodiment of the invention, such as Figure 20 , Figure 21 , Figure 22 and Figure 23 As shown, multiple support blocks 28 are evenly arranged on the front surface of the aforementioned connecting platform 7, and gaps 29 are provided between adjacent support blocks 28. The gaps 29 allow the support blocks 28 to deform to a limited extent, such as... Figure 22 As shown, the front end of the support block 28 is a wedge-shaped head, with the small end 30 of the wedge-shaped head facing the installation direction of the locking ring 8. The height of the large end 31 of the wedge-shaped head is higher than the upper surface of the support block 28, and the height of the upper surface of the support block 28 is lower than the maximum height of the front end face of the connecting platform 7. The outer edges of the large ends 31 of multiple wedge-shaped heads are located on the same circumference. The upper surface of the support block 28 behind the multiple wedge-shaped heads serves as the installation position 32 of the locking ring 8. The multiple wedge-shaped heads form the aforementioned protruding component 11; as Figure 23 As shown, the aforementioned blocking part is a vertical wall 33 extending downward from the rear end of the locking ring 8. The inner wall of the portion of the locking ring 8 extending out of the connecting platform 7 is provided with the aforementioned first mechanical locking feature 9, which is generally an internal thread. The connection feature of the nozzle 2 is generally an external thread. Since a gap 29 is provided between adjacent support blocks 28 and a wedge head is used, during installation, the blocking part of the locking ring 8 will slide along the outer surface of the wedge head towards the mounting position 32. During this process, the support block 28 will deform, allowing the blocking part to pass through and the support block 28 to quickly return to its original shape. The large head 31 of the wedge head will lock the blocking part of the locking ring 8, thus completing the axial limitation of the locking ring 8. Of course, the length of the mounting position 32 will be slightly greater than the thickness of the blocking part, so as not to hinder the axial rotation of the locking ring 8. The blocking part of the locking ring 8 can adopt the aforementioned appropriate method, which will not be described in detail here.

[0063] Furthermore, such as Figure 5As shown, a rotating handle 34 is provided on the outer surface of the locking ring 8. Of course, the rotating handle 34 can take many forms, such as a frosted surface, a uniform protrusion, a water ripple, or a recessed groove, etc. The main purpose is to facilitate the user to rotate the locking ring 8 continuously. The technical means to achieve this purpose can be appropriately modified and adopted.

[0064] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A combined spray gun, comprising a spray gun body, a detachable nozzle mounted on the spray gun body, and a liquid adjustment needle disposed on the spray gun body; the nozzle has a liquid inlet and a liquid adjustment passage connected to each other, the liquid adjustment passage being adapted to the liquid adjustment needle; an air passage on the spray gun body is adapted to the air passage on the nozzle; characterized in that, The spray gun body is provided with a connecting part, which includes a connecting platform arranged on the spray gun body, a locking ring that can rotate circumferentially relative to the connecting platform, and an axial limiting structure for limiting the axial displacement of the locking ring. The locking ring is provided with a first mechanical locking feature, and the spray head is provided with a second mechanical locking feature adapted to the first mechanical locking feature on the corresponding part facing the locking ring. The rotating locking ring combines the first mechanical locking feature with the second mechanical locking feature, pulling the paint gun body and the nozzle to form an integrated paint gun. The aforementioned axial limiting structure includes a protruding component on the connecting platform. The rear end face of the locking ring is provided with a blocking part adapted to the protruding component. Through the cooperation of the blocking part and the protruding component, the axial limiting of the locking ring is formed. At least the diameter of the largest circumference of the outer edge of the protruding component is greater than the diameter of the largest circumference of the inner edge of the blocking part of the locking ring. The connecting platform behind the protruding component can serve as a mounting position for the circumferential rotation of the locking ring, and the length of the mounting position will be greater than the thickness of the blocking part. When the locking ring and the nozzle are finally combined, the protruding component also serves as a force-bearing fixing component.

2. The combined paint spray gun according to claim 1, characterized in that, The first mechanical locking feature is one of internal thread, external thread, a plurality of jaws, or a plurality of grooves with bevels; the second mechanical locking feature is one of internal thread, external thread, a plurality of jaws, or a plurality of grooves with bevels.

3. The combined paint spray gun according to claim 2, characterized in that, The aforementioned locking ring and axial limiting structure are arranged on the connecting platform; the locking ring is provided with at least two internal thread sections, and the corresponding part of the nozzle is provided with at least two external thread sections.

4. The combined paint spray gun according to claim 2, characterized in that, The aforementioned locking ring and axial limiting structure are arranged at the corresponding positions of the nozzle. The locking ring is provided with at least two internal thread sections, and the corresponding positions of the connecting platform are provided with at least two external thread sections.

5. The combined paint spray gun according to claim 1, characterized in that, The aforementioned protruding component is a retaining ring. The front end of the aforementioned connecting platform is provided with a mounting groove, and the retaining ring is arranged in the mounting groove. The connecting platform behind the mounting groove serves as the mounting position for the locking ring. The aforementioned blocking part is a vertical wall extending downward from the rear end of the locking ring. The inner wall of the portion of the locking ring extending out of the connecting platform is provided with the aforementioned first mechanical locking feature.

6. The combined paint spray gun according to claim 5, characterized in that, The aforementioned retaining ring is a snap ring or a clamp.

7. The combined paint spray gun according to claim 1, characterized in that, The aforementioned protruding component is a retaining ring, and the front end of the aforementioned connecting platform is provided with a mounting groove, in which the retaining ring is arranged. The connecting platform behind the mounting groove serves as the mounting position for the locking ring. The aforementioned blocking part is the front end face of the locking ring, and the outer surface of the locking ring is provided with the aforementioned first mechanical locking feature.

8. The combined paint spray gun according to claim 1, characterized in that, The aforementioned connecting platform has at least two openings, and a stop is provided on the connecting platform behind the opening. The connecting platform between the stop and the opening serves as the mounting position for the locking ring. The aforementioned protruding component includes a base arranged on the body of the paint gun. A protruding block that matches the opening extends outward from the outer periphery of the base. The protruding block extends out of the corresponding opening, and the outer edge of the protruding block is located within the same circumference. The aforementioned blocking part is a vertical wall extending downward from the rear end face of the locking ring. The aforementioned first mechanical locking feature is provided on the inner wall of the portion of the locking ring that extends out of the connecting platform.

9. The combined paint spray gun according to claim 1, characterized in that, The aforementioned protruding component includes a base disposed on the body of the paint gun, the outer periphery of which extends outward to form a retaining ring; the aforementioned blocking part is a vertical wall extending downward from the rear end face of the locking ring, and the aforementioned first mechanical locking feature is provided on the inner wall of the portion of the locking ring extending out of the connecting platform.

10. The combined paint spray gun according to claim 1, characterized in that, Multiple support blocks are evenly arranged on the front end face of the aforementioned connecting platform, with gaps between adjacent support blocks. The front end of each support block is a wedge-shaped head, with the small end of the wedge-shaped head facing the installation direction of the locking ring. The height of the large end of the wedge-shaped head is higher than the upper surface of the support block, while the height of the upper surface of the support block is lower than the maximum height of the front end face of the connecting platform. The outer edges of the large ends of the multiple wedge-shaped heads are located on the same circumference. The upper surface of the support block behind the multiple wedge-shaped heads serves as the installation position for the locking ring, and the multiple wedge-shaped heads form the aforementioned protruding component. The aforementioned blocking part is a vertical wall extending downward from the rear end face of the locking ring, and the aforementioned first mechanical locking feature is provided on the inner wall of the portion of the locking ring extending out of the connecting platform.

11. The combined paint spray gun according to claim 1, characterized in that, A rotating handle is provided on the outer surface of the aforementioned locking ring.

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