Coating range adjusting device for spray gun

Abstract

The invention discloses a coating range adjusting device for a spray gun, and relates to the technical field of spray guns, the coating range adjusting device comprises a bottom plate, symmetrically distributed first electric sliding rails are mounted on the bottom plate, a sliding frame is slidably connected between the symmetrically distributed first electric sliding rails, a second electric sliding rail is slidably connected to the sliding frame, and a sliding block is slidably connected to the second electric sliding rail; a spray gun is fixedly connected in the sliding block, a conical barrel is fixedly connected to the middle of the sliding frame, the spray gun slides up and down in the conical barrel, a spring is connected between the sliding block and the conical barrel and wound on the spray gun, and symmetrically-distributed fixing frames are fixedly connected to the side, close to the first electric sliding rail, of the bottom plate. The moving route of the spray gun in the vertical direction can be controlled through the telescopic frame and the limiting rope, so that the spray gun can be correspondingly and dynamically adjusted according to the size of a coating range during spraying, the continuity and uniformity of a coating are ensured, and then the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of spray guns, and in particular to a coating range regulating device for a spray gun. Background Art

[0002] Using an adjustable range spray gun when painting canvas can bring many advantages, not only can it improve spraying efficiency, ensure coating uniformity, but also adapt to different artistic creation needs. By flexibly adjusting the spraying range, artists can switch freely between large-area coating and fine detail processing, significantly improving work efficiency.

[0003] Existing spray adjustment devices usually use fixed settings. When the spray range needs to be adjusted, the operation must be suspended or the distance between the spray gun and the canvas must be manually changed. This practice not only interrupts the continuity of the spray, but also easily leads to uneven thickness of the coating, which in turn affects the final artistic effect. In addition, frequent manual adjustments will increase the artist's workload and reduce work efficiency. It is also difficult to maintain consistent spray quality when dealing with complex patterns or details.

[0004] Based on the above situation, the present invention provides a coating range adjustment device for a spray gun. Summary of the invention

[0005] In order to overcome the disadvantage that when the spraying range needs to be adjusted, the operation must be paused or the distance between the spray gun and the painting canvas must be manually changed, which interrupts the continuity of the spraying and causes uneven thickness of the coating, the present invention provides a coating range adjustment device for a spray gun.

[0006] A coating range adjustment device for a spray gun comprises a base plate, a symmetrically distributed first electric slide rail is installed on the base plate, a slide is slidably connected between the symmetrically distributed first electric slide rails, a second electric slide rail is slidably connected to the slide rail, a slider is slidably connected to the second electric slide rail, a spray gun is fixedly connected in the slider, a cone cylinder is fixedly connected in the middle of the slide, the spray gun slides up and down in the cone cylinder, a spring is connected between the slider and the cone cylinder, the spring is wound around the spray gun, a symmetrically distributed fixed frame is fixedly connected to one side of the base plate close to the first electric slide rail, a telescopic frame is slidably connected to one side of the base plate close to the first electric slide rail, the telescopic frame is located between two horizontal fixed frames, two longitudinal fixed frames are fixedly connected to limit ropes, the movable ends of the limit ropes pass through the other two fixed frames, the telescopic parts of the telescopic frames are pressed on adjacent limit ropes, the longitudinal limit ropes are pressed on the second electric slide rail, the other two longitudinal fixed frames are threadedly connected with screws, and the bottoms of the screws are pressed on the adjacent limit ropes.

[0007] Furthermore, it also includes a liquid guide plate, the bottom of the cone is fixedly connected with the liquid guide plate, a liquid guide tube is fixedly connected to the liquid guide plate, and the movable end of the liquid guide tube passes through the cone and the slide frame in sequence.

[0008] Furthermore, it also includes a card rack, the bottom plate is slidably connected to the symmetrically distributed card racks, the symmetrically distributed first tension springs are connected between the symmetrically distributed card racks and the bottom plate, and the symmetrically distributed first tension springs are all wound around adjacent card racks.

[0009] Furthermore, it also includes an induction block, a symmetrically distributed induction block is fixed on the cone, a symmetrically distributed fixed plate is fixed on the bottom plate, the symmetrically distributed fixed plate and the slide are in a parallel position, the symmetrically distributed fixed plates are installed with induction switches, the symmetrically distributed fixed plates are rotatably connected with turntables, the bottoms of the symmetrically distributed turntables are fixed with screws, the symmetrically distributed screws are threadedly connected with sliding magnetic frames, the sliding magnetic frames and the adjacent fixed plates are slidably connected, symmetrically distributed second tension springs are connected between the sliding magnetic frames and the adjacent fixed plates, the symmetrically distributed second tension springs are wound around the adjacent sliding magnetic frames, the symmetrically distributed fixed plates are fixed with electromagnets, the symmetrically distributed turntables are slidably connected with scrapers, the symmetrically distributed fixed plates are fixed with guide rings, and the scrapers are slidably connected to the inner walls of the adjacent guide rings.

[0010] Furthermore, the induction switch is electrically connected to the adjacent electromagnet, and the electromagnet is magnetically matched to the adjacent sliding magnetic frame.

[0011] Furthermore, the scraper frame is provided with material guiding grooves evenly distributed along the circumferential direction.

[0012] Furthermore, it also includes material boxes, and the material boxes are placed on the symmetrically distributed turntables.

[0013] Furthermore, it also includes magnetic rods, symmetrically distributed card frames are slidably connected with symmetrically distributed magnetic rods, third tension springs are connected between two adjacent magnetic rods, and electromagnetic blocks symmetrically distributed along the card frames are fixed to the bottom plate.

[0014] Furthermore, the electromagnetic block and the adjacent magnetic rods are magnetically matched.

[0015] Furthermore, V-shaped grooves are formed on the inner walls of the symmetrically distributed guide rings.

[0016] Compared with the prior art, the present invention has the following advantages: the present invention can control the moving route of the spray gun in the vertical direction through the telescopic frame and the limiting rope, so that the spray gun can be dynamically adjusted accordingly according to the size of the coating range during spraying, thereby ensuring the continuity and uniformity of the coating, thereby improving work efficiency.

[0017] The present invention limits the telescopic frame by means of a clamping frame, thereby preventing the telescopic frame from being displaced during spraying and changing the spraying range, thereby improving the spraying effect.

[0018] The present invention first cleans the liquid guide plate by a scraper, and then recovers the scraped paint by a material guide trough and a material box, thereby preventing the paint adhering to the inner wall of the liquid guide plate from dripping onto the painting canvas and affecting the spraying thickness, thereby improving the spraying effect.

[0019] The present invention allows the clamping frame to continuously press the telescopic frame through the electromagnetic block and the magnetic rod, thereby preventing the telescopic frame from being displaced due to misoperation and affecting the coating range, thereby improving the spraying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the bottom plate, the sliding frame and the sliding block of the present invention.

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the components such as the slider, spray gun and cone tube of the present invention.

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the cone, liquid guide plate, liquid guide tube and other components of the present invention.

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the telescopic frame, the clamping frame, the first tension spring and other components of the present invention.

[0025] Figure 6 It is a three-dimensional structural schematic diagram of the induction block, fixing plate, induction switch and other components of the present invention.

[0026] Figure 7 It is a three-dimensional structural schematic diagram of the turntable, the sliding magnetic frame, the second tension spring and other components of the present invention.

[0027] Figure 8 It is a three-dimensional structural schematic diagram of the guide ring, material guide groove, material box and other components of the present invention.

[0028] Fig. 9 It is a schematic diagram of the three-dimensional structure of the components such as the magnetic rod, the third tension spring and the electromagnetic block of the present invention.

[0029] The markings of the components in the accompanying drawings are as follows: 1-bottom plate, 2-first electric slide rail, 3-slide frame, 4-second electric slide rail, 5-slider, 501-spray gun, 6-cone cylinder, 7-spring, 8-fixed frame, 9-telescopic frame, 10-limiting rope, 11-screw, 12-liquid guide plate, 13-liquid guide tube, 14-cage, 15-first tension spring, 16-sensing block, 161-fixed plate, 17-sensing switch, 18-turntable, 181-screw, 19-sliding magnetic frame, 20-second tension spring, 21-electromagnet, 22-scraper, 23-guide ring, 24-material guide trough, 25-material box, 26-magnetic rod, 27-third tension spring, 28-electromagnetic block. DETAILED DESCRIPTION

[0030] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

[0031] Embodiment 1: A coating range adjustment device for a spray gun, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes a bottom plate 1, first electric slide rails 2 are installed on both sides of the bottom plate 1, a slide 3 is slidably connected between the two first electric slide rails 2, the upper part of the slide 3 is slidably connected to the second electric slide rail 4, a connecting slider 5 is slidably connected to the second electric slide rail 4, a spray gun 501 is fixed in the slider 5, a feed interface for connecting to a paint pipe is provided on the upper part of the spray gun 501, a cone 6 is fixed in the middle of the slide 3, the spray gun 501 slides up and down in the cone 6, a spring 7 is connected between the slider 5 and the cone 6, the spring 7 is wound around the spray gun 501, and the bottom plate 1 is provided with a plurality of springs. The front and rear sides are both symmetrically fixed with fixed frames 8, the front and rear sides of the base plate 1 are both slidably connected with telescopic frames 9, the telescopic frame 9 is located between the two horizontal fixed frames 8, the two fixed frames 8 on the left are both fixed with limit ropes 10, the movable ends of the limit ropes 10 are respectively passed through the upper part of the fixed frames 8 on the right, the telescopic parts of the telescopic frames 9 are pressed on the adjacent limit ropes 10, the two limit ropes 10 are respectively pressed on the front and rear parts of the second electric slide rail 4, the two fixed frames 8 on the right are both threadedly connected with screws 11, and the bottoms of the screws 11 are pressed on the adjacent limit ropes 10.

[0032] like Figure 4 As shown, it also includes a drainage mechanism for collecting the paint adhered to the inner wall of the cone 6. The drainage mechanism is arranged in the cone 6. The drainage mechanism includes a liquid guide plate 12. The liquid guide plate 12 is fixedly connected to the bottom of the cone 6. The liquid guide tube 13 is fixedly connected to the rear side of the liquid guide plate 12. The movable end of the liquid guide tube 13 passes through the rear wall of the cone 6 and the rear part of the slide 3 in sequence.

[0033] When using the device, first align one end of the paint tube with the feed interface on the upper part of the spray gun 501, and use a suitable clamp or connector to firmly fix the paint tube on the feed interface of the spray gun 501, then lay the painted canvas to be sprayed flat on the bottom plate 1, and then adjust the limit rope 10 according to the required coating range. The specific operation is as follows: first loosen the screw 11 until it no longer presses the limit rope 10, and then place a corresponding number of telescopic frames 9 between the two fixed frames 8 on the front side according to the number of times the coating range changes, and let the telescopic frames 9 stop at each point where the coating range changes, and then adjust the height of the telescopic frames 9 extending upward according to the size of the coating range.

[0034] When the coating range is large, the telescopic part of the telescopic frame 9 is adjusted downward to a height lower than the slide 3. Conversely, when the coating range is small, the telescopic part of the telescopic frame 9 is adjusted upward to be flush with the slide 3. By analogy, the same number of telescopic frames 9 are also placed between the two fixed frames 8 on the rear side, and the staying position and the height of the telescopic part of the telescopic frame 9 are the same as those of the telescopic frame 9 on the front side. Then, the limit rope 10 is pulled to the right to tighten it, and the screw 11 is tightened to press the limit rope 10. The tightened limit rope 10 will contact the telescopic parts of each telescopic frame 9. Since the heights of the telescopic parts of the telescopic frames 9 are different, the limit rope 10 will be in a wavy trend.

[0035] At this time, the spray gun 501 can be controlled to spray, and at the same time, the first electric slide rail 2 can be controlled to drive the slide 3 to move left and right, and the second electric slide rail 4 can drive the slider 5 to move forward and backward. The slider 5 moving forward and backward will drive the spray gun 501 and the cone 6 to move forward and backward together, and the slide 3 moving left and right will drive the second electric slide rail 4, the slider 5, the spray gun 501, and the cone 6 to move left and right together. When the second electric slide rail 4 moves to the trough of the limit rope 10, the limit rope 10 will resist the second electric slide rail 4 to drive the slider 5, the spray gun 501, and the cone 6. The gun 501 moves downward, the spring 7 is deformed, and the nozzle of the spray gun 501 moves toward the opening direction of the cone 6. The spray gun 501 sprays more paint on the canvas and in a wider range. Similarly, when the second electric slide rail 4 moves to the wave front of the limiting rope 10, under the elastic action of the spring 7, the slider 5 will drive the spray gun 501 and the second electric slide rail 4 to move upward and reset, and the nozzle of the spray gun 501 returns to its original position. Most of the paint sprayed from the nozzle will be blocked by the inner wall of the cone 6, and a small part of the paint will be on the canvas, realizing small-scale spraying.

[0036] As the spraying time increases, the paint adhered to the inner wall of the cone 6 will be discharged through the liquid guide plate 12 and the liquid guide tube 13, and the staff can use a container to catch the paint flowing out of the liquid guide tube 13 for recycling. In summary, the telescopic frame 9 and the limiting rope 10 can control the vertical movement route of the spray gun 501, so that the spray gun 501 can be dynamically adjusted accordingly according to the size of the coating range during spraying, thereby ensuring the continuity and uniformity of the coating, thereby improving work efficiency.

[0037] Embodiment 2: Based on embodiment 1, Figure 5 As shown, it also includes a fixing mechanism for limiting the telescopic frame 9, the fixing mechanism is arranged on the base plate 1, and the fixing mechanism includes a clamping frame 14, the front and rear sides of the base plate 1 are slidably connected with the clamping frame 14, the clamping frame 14 is located above the adjacent telescopic frame 9, and symmetrically distributed first tension springs 15 are connected between the two clamping frames 14 and the base plate 1, and the symmetrically distributed first tension springs 15 are all wound around the adjacent clamping frames 14.

[0038] Initially, the slide 3 will be located at the left or right end of the first electric slide rail 2, and the slide 3 has no contact with the bracket 14. When the waveform of the limiting rope 10 is adjusted, the slide 3 moves left and right until it contacts with the bracket 14, the slide 3 will press the bracket 14 downward, and the bracket 14 will move downward. The first tension spring 15 will be deformed, and the downward moving bracket 14 will press the telescopic frame 9 to avoid displacement of the telescopic frame 9 during spraying. When the spraying is completed, the slide 3 will return to the initial position, and the slide 3 will no longer press on the bracket 14. Under the elastic action of the first tension spring 15, the bracket 14 will move upward and reset. In summary, the telescopic frame 9 is limited by the bracket 14 to avoid displacement of the telescopic frame 9 during spraying and change of the spraying range, thereby improving the spraying effect.

[0039] like Figure 6 , Figure 7 and Figure 8 As shown, a scraper mechanism for cleaning the liquid guide plate 12 is also included, the scraper mechanism is arranged on the bottom plate 1, the scraper mechanism includes a sensing block 16, the left and right parts of the lower side of the cone 6 are fixedly connected to the sensing block 16, the left and right parts of the bottom plate 1 are fixedly connected to the fixed plate 161, the two fixed plates 161 are installed with a sensing switch 17 on the side away from each other, the two fixed plates 161 are rotatably connected with a turntable 18, the bottom of the two turntables 18 are fixedly connected to the screw rod 181, the bottom of the screw rod 181 is in contact with the adjacent fixed plate 161, the two screws 181 are threadedly connected to the sliding magnetic frame 19, and the sliding magnetic frame 19 is slidably connected to the adjacent fixed plate 161 A symmetrically distributed second tension spring 20 is connected between the sliding magnetic frame 19 and the adjacent fixed plate 161, and the symmetrically distributed second tension spring 20 is wound around the adjacent sliding magnetic frame 19. An electromagnet 21 is fixedly connected to the two fixed plates 161. A scraper 22 is slidably connected to the two turntables 18. The scraper 22 has four material guide grooves 24 evenly distributed along the circumferential direction. A guide ring 23 is fixedly connected to the two fixed plates 161. V-shaped grooves are formed on the inner walls of the two guide rings 23. The scraper 22 slides on the adjacent V-shaped grooves. The induction switch 17 is electrically connected to the adjacent electromagnet 21, and the electromagnet 21 is magnetically matched with the adjacent sliding magnetic frame 19.

[0040] like Figure 8 As shown, there is also a material collecting mechanism for collecting the paint scraped off by the scraper 22 . The material collecting mechanism is arranged on the turntable 18 . The material collecting mechanism includes a material box 25 . The material boxes 25 are placed on both turntables 18 . The material boxes 25 are used to hold the paint scraped off by the scraper 22 .

[0041] When the slide 3 moves left and right, the slide 3 will drive the liquid guide plate 12 and the sensor block 16 to move left and right through the cone 6. When the sensor block 16 moving left and right contacts the sensor switch 17, the liquid guide plate 12 will be located directly above the scraper 22, and the sensor switch 17 will control the electromagnet 21 to generate magnetism. Under the action of the magnetic force, the electromagnet 21 will suck the sliding magnetic frame 19 downward to move it downward, and the second tension spring 20 will be deformed. The sliding magnetic frame 19 moving downward will drive the screw 181 to drive the turntable 18 and the scraper 22 to rotate forward. When the rotating scraper 22 moves from the low point to the high point along the V-shaped slide groove, the scraper 22 will slide upward until it contacts the inner wall of the liquid guide plate 12. As the scraper 22 continues to rotate, the scraper 22 extending into the liquid guide plate 12 will clean its inner wall.

[0042] When the scraper 22 moves from the high point of the V-shaped slide to the low point, the scraper 22 slides down into its original position again, and the scraped paint will flow into the material box 25 along the material guide groove 24. When the sensing block 16 moving left and right is separated from the sensing switch 17, the sensing switch 17 will control the electromagnet 21 to lose its magnetism, and the electromagnet 21 will no longer attract the sliding magnetic frame 19. Under the elastic action of the second tension spring 20, the sliding magnetic frame 19 will move upward, thereby driving the screw 181 to drive the turntable 18 and the scraper 22 to rotate in the opposite direction and reset. In summary, the liquid guide plate 12 is first cleaned by the scraper 22, and then the scraped paint is recovered through the material guide groove 24 and the material box 25 to avoid the paint adhering to the inner wall of the liquid guide plate 12 dripping on the painting canvas and affecting the spraying thickness, thereby improving the spraying effect.

[0043] like Fig. 9 As shown, it also includes a continuous mechanism for making the card frame 14 always press the telescopic frame 9. The continuous mechanism is arranged on the card frame 14. The continuous mechanism includes a magnetic rod 26. The two card frames 14 are both slidably connected with the magnetic rods 26 that are symmetrically distributed on the left and right. There are two third tension springs 27, and the third tension springs 27 are respectively connected between two adjacent magnetic rods 26. The front and rear sides of the base plate 1 are both symmetrically fixed with electromagnetic blocks 28. The electromagnetic blocks 28 are magnetically matched with the adjacent magnetic rods 26.

[0044] When it is necessary to maintain the position of the telescopic frame 9 unchanged, the slide 3 will not no longer press the clamping frame 14 due to the need to clean the liquid guide plate 12, so that the telescopic frame 9 may be displaced due to misoperation and change the coating range. At this time, the staff can control the electromagnetic block 28 to generate magnetism. Under the action of magnetic force, the electromagnetic block 28 will attract the adjacent magnetic rod 26, so that the two horizontal magnetic rods 26 move outward, and the third tension spring 27 will be stretched. Since the magnetic rod 26 and the electromagnetic block 28 are attracted together, the clamping frame 14 always keeps pressing the telescopic frame 9. On the contrary, when the electromagnetic block 28 is controlled to lose its magnetism, under the elastic action of the third tension spring 27, the two horizontal magnetic rods 26 move inward and reset. In summary, the electromagnetic block 28 and the magnetic rod 26 allow the clamping frame 14 to continue to press the telescopic frame 9, so as to avoid displacement due to misoperation and affect the coating range, thereby improving the spraying effect.

[0045] Although the present invention is described in detail with reference to the above embodiments, it is obvious to those skilled in the art through this disclosure that various changes or modifications may be made to the present invention without departing from the principle and spirit of the present invention defined by the claims. Therefore, the detailed description of the embodiments of the present disclosure is only used to explain, not to limit the present invention, but the scope of protection is limited by the content of the claims.

Claims

1. A coating range adjustment device for a spray gun, characterized in that: The invention comprises a bottom plate (1), on which symmetrically distributed first electric slide rails (2) are mounted, a slide frame (3) is slidably connected between the symmetrically distributed first electric slide rails (2), the slide frame (3) is slidably connected to a second electric slide rail (4), the second electric slide rail (4) is slidably connected to a slider (5), a spray gun (501) is fixedly connected in the slider (5), a cone (6) is fixedly connected in the middle of the slide frame (3), the spray gun (501) slides up and down in the cone (6), a spring (7) is connected between the slider (5) and the cone (6), the spring (7) is wound around the spray gun (501), and a pair of springs (7) are fixedly connected on one side of the bottom plate (1) close to the first electric slide rail (2). The invention relates to a fixed frame (8) distributed along the bottom plate (1), a side of the bottom plate (1) close to the first electric slide rail (2) is slidably connected with a telescopic frame (9), the telescopic frame (9) is located between the two horizontal fixed frames (8), the two longitudinal fixed frames (8) are fixedly connected with a limit rope (10), the movable ends of the limit rope (10) pass through the other two fixed frames (8), the telescopic parts of the telescopic frame (9) are pressed on the adjacent limit rope (10), the longitudinal limit rope (10) is pressed on the second electric slide rail (4), and the other two longitudinal fixed frames (8) are threadedly connected with screws (11), and the bottoms of the screws (11) are pressed on the adjacent limit rope (10).

2. A coating range adjustment device for a spray gun according to claim 1, characterized in that: The invention also comprises a liquid guide plate (12), the bottom of the cone (6) being fixedly connected to the liquid guide plate (12), a liquid guide tube (13) being fixedly connected to the liquid guide plate (12), and a movable end of the liquid guide tube (13) passing through the cone (6) and the slide (3) in sequence.

3. A coating range adjustment device for a spray gun according to claim 2, characterized in that: It also includes a card frame (14), the base plate (1) is slidably connected to the symmetrically distributed card frames (14), the symmetrically distributed card frames (14) and the base plate (1) are both connected to symmetrically distributed first tension springs (15), and the symmetrically distributed first tension springs (15) are all wound around adjacent card frames (14).

4. A coating range adjustment device for a spray gun according to claim 3, characterized in that: The device also includes an induction block (16), a symmetrically distributed induction block (16) is fixedly connected to the cone (6), a symmetrically distributed fixing plate (161) is fixedly connected to the bottom plate (1), the symmetrically distributed fixing plate (161) is in a parallel position with the slide frame (3), the symmetrically distributed fixing plate (161) is installed with an induction switch (17), the symmetrically distributed fixing plate (161) is rotatably connected with a turntable (18), the bottom of the symmetrically distributed turntable (18) is fixedly connected with a screw rod (181), the symmetrically distributed screw rod (181) is threadedly connected with a sliding magnetic frame (19), and the sliding magnetic frame (19) is slidably connected to the adjacent fixed plate (161), a symmetrically distributed second tension spring (20) is connected between the sliding magnetic frame (19) and the adjacent fixed plate (161), the symmetrically distributed second tension spring (20) is wound around the adjacent sliding magnetic frame (19), an electromagnet (21) is fixedly connected inside the symmetrically distributed fixed plate (161), a scraper (22) is slidably connected to the symmetrically distributed turntable (18), a guide ring (23) is fixedly connected to the symmetrically distributed fixed plate (161), and the scraper (22) is slidably connected to the inner wall of the adjacent guide ring (23).

5. A coating range adjustment device for a spray gun according to claim 4, characterized in that: The induction switch (17) is electrically connected to the adjacent electromagnet (21), and the electromagnet (21) is magnetically matched to the adjacent sliding magnetic frame (19).

6. A coating range adjustment device for a spray gun according to claim 5, characterized in that: The scraper (22) is provided with material guide grooves (24) evenly distributed along the circumferential direction.

7. A coating range adjustment device for a spray gun according to claim 6, characterized in that: It also includes material boxes (25), and the material boxes (25) are placed on the symmetrically distributed rotating disks (18).

8. A coating range adjustment device for a spray gun according to claim 7, characterized in that: It also comprises magnetic rods (26), the symmetrically distributed card frames (14) are all slidably connected with the symmetrically distributed magnetic rods (26), a third tension spring (27) is connected between two adjacent magnetic rods (26), and the bottom plate (1) is fixedly connected with electromagnetic blocks (28) symmetrically distributed along the card frames (14).

9. A coating range adjustment device for a spray gun according to claim 8, characterized in that: The electromagnetic block (28) and the adjacent magnetic rod (26) are magnetically matched.

10. A coating range adjustment device for a spray gun according to claim 9, characterized in that: The inner walls of the symmetrically distributed guide rings (23) are all provided with V-shaped sliding grooves.

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