Spray gun for precisely drawing lines
By introducing a buffer unit and a multi-coating interface design into the spray gun, the problem of coating leakage caused by wear of the ejector pin tip is solved, thereby improving the service life of the spray gun and the coating utilization efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN NANHAI DINGRONG PNEUMATIC TOOLS IND CO LTD
- Filing Date
- 2025-06-03
- Publication Date
- 2026-05-19
AI Technical Summary
When adjusting the paint spraying volume, the tip of the ejector pin rubs against the inner conical surface of the nozzle, causing wear and paint leakage.
A buffer unit, including a gasket, a spring seat, and a spring, is set between the ejector pin and the paint adjustment unit. The spring's buffering action slows down the speed at which the ejector pin tip inserts into the nozzle orifice, preventing wear. The multi-paint interface design enables paint mixing and recirculation.
It reduces wear on the ejector pin and nozzle, increases the service life of the spray gun, enables efficient mixing and recycling of paint, and avoids paint drying affecting its use.
Smart Images
Figure CN224253220U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of spraying equipment, and in particular to a spray gun for fine line drawing. Background Technology
[0002] In the current spray gun, the paint adjustment unit needs to be operated to adjust the paint spraying amount during use. The adjustment core rod in the paint adjustment unit is in direct contact with and pressed against the ejector pin. As a result, during the adjustment process, the tip of the ejector pin is directly inserted into the nozzle orifice. Since the nozzle has an inner conical surface and the tip of the ejector pin has an outer conical surface, the inner and outer conical surfaces rub against each other, causing wear and paint leakage. Utility Model Content
[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, an embodiment of this utility model proposes a spray gun for fine line drawing, including a gun body, a ejector pin, a nozzle unit, and a paint adjustment unit. The paint adjustment unit includes an adjustment core rod. The gun body has a main channel, the ejector pin is inserted into the main channel, the nozzle unit is installed at the front opening of the main channel, and the tip of the ejector pin is inserted into the nozzle unit. It also includes a buffer unit. The buffer unit is installed in a knob guide seat and includes a gasket, a spring seat, and a spring. The gasket contacts the front end of the adjustment core rod, the front of the spring seat abuts against a needle seat, the needle seat is installed at the tail end of the ejector pin, the spring is installed in the spring seat, and the rear end of the spring contacts the gasket.
[0004] According to some embodiments of the present invention, the needle holder is equipped with a locking screw, which is used to press and fix the ejector pin.
[0005] According to some embodiments of this utility model, the main channel is divided into a first channel and a second channel, a valve seat is installed between the first channel and the second channel, the ejector pin passes through the valve seat, the nozzle unit is installed at the front end opening of the first channel, and the first channel has a paint interface, with at least three paint interfaces.
[0006] The paint adjustment unit is installed at the rear end of the second channel. The gun needle holder and the buffer unit are installed inside the second channel. The second channel has a spray air inlet located in front of the gun needle holder.
[0007] According to some embodiments of the present invention, the nozzle unit includes a nozzle, a spray cap, and a cap nut. The nozzle is installed at the front opening of the first channel, the spray cap is fitted over the nozzle, and the cap nut is used to lock the spray cap onto the gun body.
[0008] The nozzle has a first nozzle opening at its front end, and the tip of the ejector pin is movably inserted into the first nozzle opening. An atomizing gas chamber is formed between the nozzle and the spray cover. A second nozzle opening is formed on the spray cover, and the second nozzle opening communicates with the atomizing gas chamber.
[0009] According to some embodiments of the present utility model, the front end of the gun body is provided with a mounting seat, the mounting seat is threadedly connected to the cap nut, a central hole is opened at the center of the mounting seat, the central hole communicates with the first channel, and the rear end of the nozzle is inserted into the central hole;
[0010] The gun body is provided with an atomizing gas channel. The air inlet of the atomizing gas channel is located at the rear end of the gun body. The mounting base has an air outlet. The air outlet communicates with the atomizing gas channel and faces the atomizing gas chamber. There are multiple air outlets, which are arranged around the central hole.
[0011] According to some embodiments of the present invention, the nozzle includes a nozzle head, a tail tube, and a retaining ring. The nozzle head has a first nozzle opening at its front end. The retaining ring is used to separate the nozzle head from the tail tube. The tail tube is inserted into the front opening of the first channel. The edge of the retaining ring has multiple notches arranged in a row.
[0012] According to some embodiments of the present invention, the spray head is conical, and the end of the spray head is located inside the spray cover.
[0013] According to some embodiments of the present invention, the front end of the nozzle is provided with a cylindrical portion, and the cylindrical portion protrudes from the second nozzle.
[0014] According to some embodiments of the present utility model, the paint adjustment unit further includes a knob, a fixing pin, and a fixing spring. The knob has an inner cavity, and the tail of the knob guide seat is equipped with a guide seat screw. The adjustment core rod is rotatably installed inside the guide seat screw (460). The rear section of the adjustment core rod enters the inner cavity and connects with the knob. The knob guide seat is inserted into the inner cavity.
[0015] The outer wall of the guide screw is engraved with multiple horizontal grooves, the inner side wall of the inner cavity is provided with an installation groove, the fixing pin is installed in the installation groove, the outer side wall of the knob is provided with an installation ring groove, the installation ring groove is provided with a window, the window is connected to the installation groove, the fixing spring is fitted on the window, and when the knob is rotated, the fixing pin rolls through multiple horizontal grooves in sequence.
[0016] According to some embodiments of this utility model, the gun body has a connecting screw hole, which passes through the gun body along the left and right axis.
[0017] The embodiments of this utility model have at least the following beneficial effects:
[0018] 1. A buffer unit is installed between the ejector pin and the paint adjustment unit. The buffer unit includes a shim, a spring seat, and a spring. The shim contacts the front end of the adjusting mandrel, the front of the spring seat abuts against the needle seat, the needle seat is installed at the tail end of the ejector pin, and the spring is installed inside the spring seat, with the rear end of the spring contacting the shim. When the paint adjustment unit is adjusted, the adjusting mandrel is rotated, causing the mandrel to push the shim, which in turn pushes the spring. The spring acts as a buffer, slowing down the speed at which the spring seat pushes the needle seat. This prevents the tip of the ejector pin from being directly inserted into the nozzle orifice when the ejector pin is adjusted by the paint adjustment unit, thus avoiding wear on the ejector pin and nozzle and improving service life.
[0019] 2. Connect multiple spray guns side by side using connecting screw holes to achieve efficient spraying and line drawing.
[0020] 3. The main body adopts a three-coating interface design. Two coating interfaces can be used for coating inlet to achieve dual coating mixing; the other coating interface can be used for coating return, or only two coating interfaces can be used, with the two coating interfaces used for coating inlet and coating return respectively. The above coating return design realizes the recycling treatment of coating inside the gun body, avoiding the coating inside the gun body from drying and affecting its use.
[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0023] Figure 1 This is an overall exploded view of an embodiment of the present utility model;
[0024] Figure 2 This is a schematic diagram of the overall usage state of an embodiment of the present utility model;
[0025] Figure 3 This is a top view of an embodiment of the present utility model;
[0026] Figure 4 for Figure 2 Schematic diagram of the AA section;
[0027] Figure 5 This is a schematic front view of an embodiment of the present utility model;
[0028] Figure 6 for Figure 4 Schematic diagram of the BB cross section;
[0029] Figure 7 This is an overall rear view schematic diagram of an embodiment of the present utility model;
[0030] Figure 8 for Figure 6 Schematic diagram of the CC section;
[0031] Figure 9 This is a schematic diagram of the overall left side of an embodiment of the present utility model;
[0032] Figure 10 for Figure 8 Schematic diagram of the DD section;
[0033] Figure 11 This is an exploded view of the nozzle unit according to an embodiment of the present invention;
[0034] Figure 12 This is a schematic diagram of an embodiment of the spray head of this utility model;
[0035] Figure 13 This is a schematic diagram of embodiment two of the spray head of this utility model;
[0036] Figure 14 This is a schematic diagram of the coating adjustment unit according to an embodiment of the present invention;
[0037] Figure 15 for Figure 4 Enlarged diagram of E in the middle;
[0038] Figure 16 This is a schematic diagram of the guide screw and knob in an embodiment of the present utility model. Detailed Implementation
[0039] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0040] In the description of this utility model, "more than" means two or more, and "greater than," "less than," "exceeding," etc., are understood to exclude the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.
[0041] The ejector pin 200 and the nozzle unit 300 play a crucial role in the spray gun. Together, they are responsible for controlling the amount of paint sprayed and guiding the direction of the spray flow. When the tip of the ejector pin 200 is fully inserted into the nozzle 310 of the nozzle unit 300, it can cut off the paint flow. The actual amount of paint sprayed in the spray gun is controlled by controlling the size of the gap between the tip of the ejector pin 200 and the inner wall of the nozzle 310. That is, as the gap between the tip of the ejector pin 200 and the inner wall of the nozzle 310 increases, the amount of paint sprayed increases.
[0042] Reference Figures 1 to 4 A spray gun for fine line drawing includes a gun body 100, a ejector pin 200, a nozzle unit 300, and a paint adjustment unit 400. The gun body 100 has a main channel 101, the ejector pin 200 is inserted into the main channel 101, the nozzle unit 300 is installed at the front opening of the main channel 101, and the tip of the ejector pin 200 is inserted into the nozzle unit 300. The spray gun also includes a paint adjustment unit 400 and a buffer unit 500. The paint adjustment unit 400 includes an adjustment core rod 450. The buffer unit 500 includes a gasket 510, a spring seat 520, and a spring 530. The gasket 510 contacts the front end of the adjustment core rod 450, the front of the spring seat 520 abuts against a needle seat 210, the needle seat 210 is installed at the tail end of the ejector pin 200, the spring 530 is installed in the spring seat 520, and the rear end of the spring 530 contacts the gasket 510.
[0043] A buffer unit 500 is provided between the ejector pin 200 and the paint adjusting unit 400. The buffer unit 500 includes a gasket 510, a spring seat 520, and a spring 530. The gasket 510 contacts the front end of the adjusting core rod 450. The front of the spring seat 520 abuts against the needle holder 210, which is installed at the tail end of the ejector pin 200. The spring 530 is installed inside the spring seat 520, and its rear end contacts the gasket 510. The paint adjusting unit 400... During adjustment, the adjusting mandrel 450 is rotated, causing the mandrel 450 to push the shim 510. The shim 510 pushes the spring 530, which acts as a buffer to slow down the speed at which the spring seat 520 pushes the needle seat 210. This prevents the tip of the ejector pin 200 from being directly inserted into the nozzle 310 when the paint adjusting unit 400 is adjusting it, thus avoiding wear on the ejector pin 200 and the nozzle 310 and improving their service life.
[0044] Reference Figure 4 As shown, the needle holder 210 is equipped with a locking screw 220, which is used to press and fix the ejector pin 200.
[0045] When replacing the ejector pin 200, loosen the locking screw 220 to release the pressure of the locking screw 220 on the ejector pin 200, pull the old ejector pin 200 out of the needle holder 210, insert the new ejector pin 200 into the needle holder, and tighten the locking screw 220 so that the locking screw 220 presses and fixes the new ejector pin 200, making the replacement operation of the ejector pin 200 easier.
[0046] Reference Figure 4 , 6 As shown in Figures 10 and 11, the main channel 101 is divided into a first channel 101A and a second channel 101B. A valve seat 600 is installed between the first channel 101A and the second channel 101B. The valve seat 600 separates the space of the first channel 101A from the space of the second channel 101B, preventing the paint in the first channel 101A from entering the second channel 101B and preventing air in the second channel 101B from entering the first channel 101A, which would disrupt the flow of paint into the first channel 101A and result in insufficient paint volume.
[0047] The ejector pin 200 passes through the valve seat 600. The nozzle unit 300 is installed at the front opening of the first channel 101A. The first channel 101A has a paint interface 110. At least three paint interfaces 110 are used. The three paint interfaces 110 are located at the top, bottom and side wall of the gun body 100, respectively.
[0048] In practical use, two of the paint inlets 110 can be used for paint inlet to achieve dual paint mixing; the other paint inlet 110 can be used for paint recirculation.
[0049] Alternatively, only two paint inlets 110 may be used, with the other paint inlet 110 sealed by a sealing screw. The two paint inlets 110 are used for paint inlet and paint return respectively.
[0050] The above-mentioned paint recirculation design enables the recycling of paint inside the gun body 100, preventing the paint inside the gun body 100 from drying and affecting its use.
[0051] Reference Figure 2 , 4 As shown, a paint adjustment unit 400 is installed at the rear end of the second channel 101B. A gun needle holder 210 and a buffer unit 500 are installed inside the second channel 101B. The second channel 101B has a spray air inlet 120, which is located in front of the gun needle holder 210.
[0052] Reference Figure 6 As shown, during the spraying operation, high-pressure air enters the second channel 101B through the spraying air inlet 120 and pushes the needle holder 210 backward. When the needle holder 210 is pushed backward, the spring seat 520 is compressed towards the pad 510.
[0053] The needle is moved backward, and then retracted within the nozzle 310 orifice, so that the needle does not close the nozzle 310 orifice, allowing the paint to be sprayed out. The size of the gap between the tip of the ejector pin 200 and the inner wall of the nozzle 310 orifice is related to the amount of paint sprayed out.
[0054] By rotating the adjusting mandrel 450, the adjusting mandrel 450 pushes the shim 510, reducing the gap between the shim 510 and the spring seat 520, thereby reducing the distance the gun needle moves backward; after the ejector pin 200 moves backward, there is a smaller gap between the tip of the ejector pin 200 and the inner wall of the nozzle 310, so that a small amount of paint can pass through.
[0055] When the adjusting mandrel 450 is rotated in the reverse direction, the distance between the shim 510 and the spring seat 520 is increased, thereby increasing the distance the gun needle moves backward; after the ejector pin 200 moves backward, there is a larger gap between the tip of the ejector pin 200 and the inner wall of the nozzle 310, allowing a large amount of paint to pass through.
[0056] After the spraying is completed, the high-pressure air is released from pushing the needle holder 210 backward. The elastic force of the spring 530 pushes the spring seat 520, which in turn pushes the needle holder 210 to reset the needle and re-close the nozzle 310, preventing paint from flowing out of the nozzle 310.
[0057] Reference Figure 4 , 11 As shown, the nozzle unit 300 includes a nozzle 310, a spray cap 320, and a cap nut 330. The nozzle 310 is installed at the front opening of the first channel 101A. The spray cap 320 is fitted over the nozzle 310. The cap nut 330 is used to lock the spray cap 320 onto the gun body 100. The front end of the gun body 100 is provided with a mounting seat 140, which is threadedly connected to the cap nut 330.
[0058] The inner wall of the cap nut 330 is provided with an inner protruding ring 331, and the outer wall of the spray cap 320 is provided with an outer protruding ring 322. During the process of threading the cap nut 330 to the mounting base 140, the inner protruding ring 331 will pull the outer protruding ring 322 backward, thereby pressing the rear end of the spray cap 320 against the front end face of the mounting base 140, thereby achieving the locking and fixing of the spray cap 320.
[0059] The nozzle 310 has a first nozzle 314 at its front end. The tip of the ejector pin 200 is inserted into the first nozzle 314. An atomizing chamber 301 is formed between the nozzle 310 and the spray cover 320. A second nozzle 321 is opened on the spray cover 320. The second nozzle 321 communicates with the atomizing chamber 301.
[0060] The mounting base 140 has a central hole 141 at its center, which communicates with the first channel 101A. The rear end of the nozzle 310 is inserted into the central hole 141.
[0061] Reference Figure 8 As shown, the gun body 100 is provided with an atomizing gas channel 130. The air inlet of the atomizing gas channel 130 is located at the rear end of the gun body 100. The mounting base 140 has an air outlet 142. The air outlet 142 is used to connect the atomizing gas channel 130 with the atomizing gas chamber 301, so that the atomizing gas enters the atomizing gas chamber 301 through the air outlet 142. Multiple air outlets 142 are used and arranged around the central hole 141.
[0062] During spraying, the atomized high-pressure gas passes through the atomizing gas channel 130, enters the atomizing gas chamber 301 through the air outlet 142, and is then sprayed out through the second nozzle 321. It comes into contact with the paint sprayed out through the first nozzle 314, breaking the paint into tiny, uniform droplets. This increases the spraying area, reduces the paint film thickness, improves adhesion and coverage efficiency, achieves precise coating, and reduces paint waste.
[0063] Reference Figure 11 As shown, the nozzle 310 includes a nozzle head 311, a tail tube 312, and a retaining ring 313. The nozzle head 311 has a first nozzle opening 314 at its front end. The retaining ring 313 is used to separate the nozzle head 311 from the tail tube 312. The tail tube 312 is inserted into the front opening of the first channel 101A. The edge of the retaining ring 313 has multiple notches 3131 arranged to allow atomized high-pressure gas to pass through, so that the atomized gas located at the rear of the atomizing gas chamber 301 enters the front of the atomizing gas chamber 301 through the notches 3131.
[0064] Depending on the type of paint to be sprayed and the desired spraying effect, the spray head 311 adopts the following implementation method:
[0065] Reference Figure 12 In one embodiment, the spray head 311 is conical, and the end of the spray head 311 is located inside the spray cap 320. It is suitable for low viscosity coatings and sprays finer lines.
[0066] Reference Figure 13 In the second embodiment, the front end of the spray head 311 is provided with a cylindrical part 3111, and the cylindrical part 3111 protrudes from the second nozzle 321, which is suitable for high viscosity coatings and spraying medium and coarse lines.
[0067] Reference Figure 1 , 14 As shown in Figure 16, the paint adjustment unit 400 also includes a knob guide 410, a knob 420, a fixing pin 430, a fixing spring 440, and a guide screw 460. The knob guide 410 serves as the basis for connecting the paint adjustment unit 400 to the gun body 100, and also serves as the basis for installing other components.
[0068] To fix the adjusting mandrel 450 and prevent it from wobbling during rotation, a guide screw 460 is used.
[0069] To facilitate the rotation of the adjusting mandrel 450, a knob 420 is required.
[0070] To ensure that the knob 420 remains in place without external force after rotation, a retaining pin 430 is required. The following is a detailed installation description of the above components:
[0071] The knob guide seat 410 is installed at the rear opening of the second channel 101B. The buffer unit 500 is installed inside the knob guide seat 410. The tail of the knob guide seat 410 is equipped with a guide seat screw 460. The adjusting core rod 450 is rotatably installed inside the guide seat screw 460. The knob 420 is provided with an inner cavity 421. The rear section of the adjusting core rod 450 enters the inner cavity 421 and connects with the knob 420. The knob guide seat 410 is inserted into the inner cavity 421.
[0072] When not in operation, the knob 420 will rotate on its own due to external force. For this purpose, multiple horizontal grooves 461 are engraved on the outer wall of the guide screw 460. The horizontal grooves 461 extend axially. The inner side wall of the inner cavity 421 has a mounting groove 422. A fixing pin 430 is installed in the mounting groove 422. During the rotation of the knob 420, the fixing pin 430 will rotate into the horizontal groove 461, so that the position of the knob 420 is fixed.
[0073] To further strengthen the fixation of the retaining pin 430 within the groove 461, a mounting ring groove 423 is provided on the outer wall of the knob 420. The mounting ring groove 423 has a window 424 that communicates with the mounting groove 422, allowing part of the retaining pin 430 to be exposed through the window 424, but the retaining pin 430 will not come out of the window 424. At the same time, a retaining spring 440 is fitted on the mounting ring groove 423, pressing the portion of the retaining pin 430 exposed through the window 424.
[0074] During operation, when the knob 420 is rotated, the fixing pin 430 rolls through the horizontal grooves 461 in sequence and generates vibration. This vibration is felt by the user's hand, which serves as a prompt for operation. When the adjustment is in place, the fixing pin 430 is pressed into the horizontal grooves 461 by the fixing spring 440, so that the position of the knob 420 is fixed, and the position of the ejector pin 200 is also fixed, thereby achieving the fixation of the paint volume adjustment.
[0075] Reference Figure 2 , 11 As shown, the gun body 100 has a connecting screw hole 150. The connecting screw hole 150 passes through the gun body 100 along the left and right axis. Multiple spray guns can be connected side by side using the connecting screw hole 150 to achieve efficient spraying and line drawing.
[0076] In the description of this specification, references to terms such as "some embodiments" or "as one might imagine" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one embodiment or example.
[0077] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A spray gun for fine line drawing, comprising a gun body (100), a ejector pin (200), a nozzle unit (300), and a paint adjusting unit (400); the gun body (100) has a main channel (101), the ejector pin (200) is inserted into the main channel (101), the nozzle unit (300) is installed at the front opening of the main channel (101), the tip of the ejector pin (200) is inserted into the nozzle unit (300), and the paint adjusting unit (400) includes an adjusting core rod (450), characterized in that, Also includes: The buffer unit (500) includes a pad (510), a spring seat (520), and a spring (530). The pad (510) contacts the front end of the adjusting core rod (450). The front of the spring seat (520) abuts against a needle seat (210). The needle seat (210) is installed at the tail end of the ejector pin (200). The spring (530) is installed inside the spring seat (520), and the rear end of the spring (530) contacts the pad (510).
2. The spray gun for fine line drawing according to claim 1, characterized in that, The needle holder (210) is equipped with a locking screw (220) for pressing and fixing the ejector pin (200).
3. The spray gun for fine line drawing according to claim 1, characterized in that, The main channel (101) is divided into a first channel (101A) and a second channel (101B). A valve seat (600) is installed between the first channel (101A) and the second channel (101B). The ejector pin (200) passes through the valve seat (600). The nozzle unit (300) is installed at the front end opening of the first channel (101A). The first channel (101A) has a paint inlet (110). At least three paint inlets (110) are used. The paint adjustment unit (400) is installed at the rear end of the second channel (101B). The gun needle holder (210) and the buffer unit (500) are installed inside the second channel (101B). The second channel (101B) has a spray air inlet (120) located in front of the gun needle holder (210).
4. The spray gun for fine line drawing according to claim 3, characterized in that, The nozzle unit (300) includes a nozzle (310), a spray cap (320), and a cap nut (330). The nozzle (310) is installed at the front opening of the first channel (101A). The spray cap (320) is fitted over the nozzle (310). The cap nut (330) is fitted over the spray cap (320). The inner wall of the cap nut (330) is provided with an inner convex ring (331). The outer wall of the spray cap (320) is provided with an outer convex ring (322). The inner convex ring (331) is used to pull the outer convex ring (322). The nozzle (310) has a first nozzle (314) at its front end. The tip of the ejector pin (200) is inserted into the first nozzle (314). An atomizing chamber (301) is formed between the nozzle (310) and the spray cap (320). A second nozzle (321) is opened on the spray cap (320). The second nozzle (321) communicates with the atomizing chamber (301).
5. The spray gun for fine line drawing according to claim 4, characterized in that, The gun body (100) has a mounting base (140) at the front end. The mounting base (140) is threadedly connected to the cap nut (330). The mounting base (140) has a central hole (141) at the center. The central hole (141) is connected to the first channel (101A). The rear end of the nozzle (310) is inserted into the central hole (141). The gun body (100) is provided with an atomizing gas channel (130). The air inlet of the atomizing gas channel (130) is located at the rear end of the gun body (100). The mounting base (140) has an air outlet (142). The air outlet (142) is used to connect the atomizing gas channel (130) with the atomizing gas chamber (301). Multiple air outlets (142) are used and arranged around the central hole (141).
6. The spray gun for fine line drawing according to claim 4, characterized in that, The nozzle (310) includes a nozzle head (311), a tail tube (312), and a retaining ring (313). The nozzle head (311) has a first nozzle opening (314) at its front end. The retaining ring (313) is used to separate the nozzle head (311) from the tail tube (312). The tail tube (312) is inserted into the front opening of the first channel (101A). The edge of the retaining ring (313) has multiple notches (3131). The atomized gas located at the rear of the atomizing gas chamber (301) enters the front of the atomizing gas chamber (301) through the notches (3131).
7. The spray gun for fine line drawing according to claim 6, characterized in that, The nozzle (311) is conical, and the end of the nozzle (311) is located inside the spray cap (320).
8. The spray gun for fine line drawing according to claim 6, characterized in that, The front end of the nozzle (311) is provided with a cylindrical part (3111), which protrudes from the second nozzle (321).
9. The spray gun for fine line drawing according to claim 3, characterized in that, The paint adjustment unit (400) further includes a knob guide seat (410), a knob (420), a fixing pin (430), and a fixing spring (440). The knob guide seat (410) is installed at the rear opening of the second channel (101B). The buffer unit (500) is installed inside the knob guide seat (410). The tail of the knob guide seat (410) is equipped with a guide screw (460). The adjustment core rod (450) is rotatably installed inside the guide screw (460). The knob (420) has an inner cavity (421). The rear section of the adjustment core rod (450) enters the inner cavity (421) and connects with the knob (420). The knob guide seat (410) is inserted into the inner cavity (421). The outer wall of the guide screw (460) is engraved with multiple horizontal grooves (461), which extend axially. The inner wall of the inner cavity (421) has an installation groove (422), in which the fixing pin (430) is installed. The outer wall of the knob (420) has an installation ring groove (423), which has a window (424) communicating with the installation groove (422). The fixing spring (440) is fitted onto the window (424). When the knob (420) is rotated, the fixing pin (430) rolls through the multiple horizontal grooves (461) in sequence.
10. The spray gun for fine line drawing according to claim 1, characterized in that, The gun body (100) has a connecting screw hole (150) that passes through the gun body (100) along the left and right axis.