A spray gun coating device

Abstract

The present invention discloses a spray gun coating device, which includes a base, a spray gun body installed on the base, a card seat installed on the base, a syringe installed on the card seat, a linear motion driver installed on the base, and an extrusion member installed on the linear motion driver and used to drive the core rod of the syringe to move; a groove for the barrel of the syringe to be snapped into is provided on the card seat, the barrel of the syringe has a flange, and the flange abuts against the outside of the card seat. The liquid inlet of the spray gun body is communicated with the injection port of the syringe. A first notch and a second notch are provided on the inner wall of the groove, and the first notch and the second notch are symmetrically distributed with the axis of the barrel of the syringe as the center. The present invention can realize automatic spraying and can quickly replace the coating at the same time, belonging to the technical field of spray gun coating mechanisms.

Description

Technical Field

[0001] The present invention relates to the technical field of spray gun coating mechanisms, and particularly to a spray gun coating device. Background Art

[0002] Traditional coatings require manual weighing, configuration, dispersion and other processes during the formulation preparation process. After the coating formula is made, a film is manually prepared to detect the various properties of the coating. There are too many drawbacks in terms of energy conservation, environmental protection and efficiency in the batching and sample preparation processes. Especially in the process of laboratory R & D samples, too much manpower and material resources are consumed each time. Moreover, when the existing spraying equipment changes the spray material sample, the spray gun and the coating pipeline need to be cleaned, and then the spray gun is connected to the corresponding material bucket. The coating consumption is large, and the samples in the R & D process are generally small, which is not suitable for small-dose R & D proofing. This process is very complex and cannot meet the requirements of intelligent manufacturing. Summary of the Invention

[0003] Aiming at the technical problems existing in the prior art, the object of the present invention is to provide a spray gun coating device, which can realize automatic spraying and can quickly change the coating at the same time.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A spray gun coating device includes a base, a spray gun body installed on the base, a card seat installed on the base, a syringe installed on the card seat, a linear motion driver installed on the base, and a pressing member installed on the linear motion driver and used to drive the movement of the plunger rod of the syringe.

[0006] The card seat is provided with a groove for the barrel of the syringe to be inserted. The barrel of the syringe has a flange, and the flange abuts against the outside of the card seat. The liquid inlet of the spray gun body is communicated with the injection port of the syringe.

[0007] Furthermore, the inner wall of the groove is provided with a first notch and a second notch, and the first notch and the second notch are symmetrically distributed with the axis of the barrel of the syringe as the center.

[0008] Furthermore, the inner wall of the groove is also provided with an injection hole for the needle of the syringe to be inserted and a first liquid channel communicated with the injection hole. A sealing plug is arranged between the injection hole and the first liquid channel. The needle installed at the injection port of the syringe passes through the sealing plug and extends into the first liquid channel. A connecting member connected to the spray gun body is fixedly arranged on the card seat, and a second liquid channel is arranged in the connecting member. The liquid inlet of the spray gun body is communicated with the first liquid channel through the second liquid channel.

[0009] Furthermore, the spray gun coating device further includes an infrared distance sensor installed on the base; a through hole is provided on the extrusion member, and the ray of the infrared distance sensor passes through the through hole and irradiates on the plunger rod of the syringe.

[0010] Furthermore, the linear motion driver includes a first support and a second support both fixed on the base, a first synchronous pulley rotatably installed on the first support, a second synchronous pulley rotatably installed on the second support, a motor with an output end connected to the first synchronous pulley, a synchronous belt sleeved on the first synchronous pulley and the second synchronous pulley, and a driving block fixed on the synchronous belt; the extrusion member is fixed on the driving block.

[0011] Furthermore, the linear motion driver further includes a first wheel shaft; a first bearing and a second bearing are rotatably installed on the first support, a first installation groove is provided between the first bearing and the second bearing, one end of the first wheel shaft is installed on the first bearing, the other end of the first wheel shaft is installed on the second bearing and connected to the output end of the motor, and the first synchronous pulley is located in the first installation groove and fixedly installed on the first wheel shaft.

[0012] Furthermore, the linear motion driver further includes a second wheel shaft; a third bearing and a fourth bearing are rotatably installed on the second support, a second installation groove is provided between the third bearing and the fourth bearing, one end of the second wheel shaft is installed on the third bearing, the other end of the second wheel shaft is installed on the fourth bearing, and the second synchronous pulley is located in the second installation groove and fixedly installed on the second wheel shaft.

[0013] Furthermore, the linear motion driver further includes a sleeper fixed on the base, a guide rail fixed on the sleeper, and a slider slidably installed on the guide rail; the slider is fixed on the synchronous belt, and the slider and the driving block are symmetrically distributed on both sides of the synchronous belt.

[0014] Furthermore, the spray gun coating device further includes a photoelectric switch installed on the base and an induction sheet that is relatively fixed to the driving block and used to block the emitted light of the photoelectric switch.

[0015] Furthermore, the linear motion driver further includes a dust cover; a strip-shaped groove is provided on the dust cover, the synchronous belt extends out from the strip-shaped groove, the first support, the second support, the first synchronous pulley, and the second synchronous pulley are all located inside the dust cover, and the driving block is located outside the dust cover.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The cavity of the syringe barrel of this device can directly hold the film-forming substance. The syringe is installed on the card seat. Driven by the linear motion driver, the syringe injects the coating into the spray gun body, and the spray gun body realizes automatic material discharge for film formation. During use, different formulations of coatings can be changed by replacing different syringes, enabling rapid sample preparation replacement, saving manpower and material resources, and being suitable for small-dose R & D sample preparation. This device has fewer coating common pipes, facilitating automatic cleaning, which is fast and convenient. This application can maintain the spraying performance of the spray gun body of each brand and model, and the spray gun body of each brand and model can be replaced at any time, making the application range of the spray gun coating device wider. This device uses disposable syringes, which can not only achieve rapid coating replacement but also small-dose spraying, and is particularly suitable for laboratory spraying sample preparation. This device can place the syringe manually or automatically in cooperation with a special mechanism or robot, etc. The interior of the spray gun body, the first liquid channel, and the second liquid channel of this application are in a vacuum state during the working state, enabling automatic color change of small-dose coatings and automated spraying. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the spray gun coating device.

[0018] Figure 2 is a schematic structural diagram of the spray gun body, card seat, and syringe.

[0019] Figure 3 is a cross-sectional view of the spray gun body, card seat, and syringe.

[0020] Figure 4 is Figure 3 an enlarged view of part A of

[0021] Figure 5 is a schematic structural diagram of the linear motion driver.

[0022] Figure 6 is a schematic structural diagram of the linear motion driver from another perspective.

[0023] Figure 7 is a schematic structural diagram of the dust cover.

[0024] In the figure, 1 is the base, 2 is the spray gun body, 3 is the card seat, 4 is the syringe, 5 is the linear motion driver, 6 is the extrusion piece, 7 is the adapter, 8 is the infrared distance sensor, 9 is the optoelectronic switch, 10 is the sensing piece, 11 is the dust cover, 12 is the strip-shaped groove, 21 is the third liquid channel, 22 is the detection hole, 31 is the groove, 32 is the first notch, 33 is the second notch, 34 is the injection hole channel, 35 is the first liquid channel, 36 is the sealing plug, 41 is the syringe barrel, 42 is the plunger rod, 43 is the needle head, 44 is the flange, 50 is the motor, 51 is the first support, 52 is the second support, 53 is the first synchronous pulley, 54 is the second synchronous pulley, 55 is the synchronous belt, 56 is the drive block, 57 is the sleeper, 58 is the guide rail, 59 is the slider, 61 is the through hole, 71 is the second liquid channel, 111 is the first limit block, 112 is the second limit block, 113 is the shaft hole, 510 is the first wheel shaft, 511 is the first bearing, 512 is the second bearing, 520 is the second wheel shaft, 521 is the third bearing, 522 is the fourth bearing. Detailed implementation manner

[0025] The following combines the drawings and embodiments to further describe in detail the specific implementation manner of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", and "communication" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] For the convenience of narration, unless otherwise stated, the up and down directions mentioned below are the same as Figure 1 the up and down directions of itself.

[0028] As Figures 1 to 4 shown, this embodiment provides a spray gun coating device, including a base 1, a spray gun body 2 installed on the base 1, a card seat 3 installed on the base 1, a syringe 4 installed on the card seat 3, a linear motion driver 5 installed on the base 1, and an extrusion piece 6 installed on the linear motion driver 5 and used to drive the plunger rod 42 of the syringe 4 to move; the spray gun body 2 can atomize and spray the coating. After the syringe barrel 41 of the syringe 4 is filled with the coating, it is installed on the card seat 3, and then the linear motion driver 5 drives the extrusion piece 6 to extrude the plunger rod 42 of the syringe 4. The plunger rod 42 pushes the piston of the syringe 4 to inject the coating in the syringe barrel 41 into the spray gun body 2, and finally sprays out from the nozzle of the spray gun body 2.

[0029] The card seat 3 is provided with a groove 31 for the barrel 41 of the syringe 4 to be snapped into. The barrel 41 of the syringe 4 has a flange, and the flange abuts against the outer side of the card seat 3. The liquid inlet of the spray gun body 2 is communicated with the injection port of the syringe 4. The linear motion driver 5 is placed vertically, and the linear motion driver 5 drives the extrusion block to move up and down in the vertical direction. The card seat 3 is cylindrical, the groove 31 is opened on the circumferential side surface of the card seat 3, and the upper end surface of the card seat 3 is provided with a jack communicated with the groove 31. When the syringe 4 is installed on the card seat 3, the barrel 41 of the syringe 4 moves horizontally and enters the groove 31 from the circumferential side surface of the card seat 3. A flange is provided on the circumferential side surface of the upper end of the barrel 41. After the barrel 41 is snapped into the groove 31, the flange is located on the upper end surface of the card seat 3 and contacts the upper end surface of the card seat 3. When the extrusion member 6 presses down the core rod 42, the upper end surface of the card seat 3 provides a supporting force for the barrel 41 to prevent the barrel 41 from moving down. By abutting the flange against the upper end surface of the card seat 3, as long as the diameter of the barrel 41 is smaller than the width of the groove 31, the degree of freedom of the barrel 41 in the vertical direction can be effectively restricted, preventing the barrel 41 from moving when the extrusion member 6 presses the core rod 42. Compared with setting a hole with the same diameter as the barrel 41, the design of the present application has a wider application range for the barrel 41.

[0030] Specifically, in one embodiment, the inner wall of the groove 31 is provided with a first notch 32 and a second notch 33, and the first notch 32 and the second notch 33 are symmetrically distributed centered on the axis of the barrel 41 of the syringe 4. After the barrel 41 of the syringe 4 is filled with the coating, it can be placed in the groove 31 of the card seat 3 manually or by means of a manipulator. The barrel 41 is located between the first notch 32 and the second notch 33, and the first notch 32 and the second notch 33 are separated on both sides of the barrel 41. When the barrel 41 is placed into the groove 31 horizontally by manually or by means of a manipulator to hold the barrel 41, the inner wall of the groove 31 will hinder the movement of the human hand or the manipulator. The first notch 32 and the second notch 33 can avoid the human hand or the manipulator, enabling the human hand or the manipulator to enter the groove 31, facilitating the placement of the barrel 41.

[0031] Specifically, in one embodiment, an injection hole passage 34 for inserting the needle 43 of the syringe 4 and a first liquid passage 35 communicating with the injection hole are further provided on the inner wall (bottom) of the groove 31; a sealing plug 36 is provided between the injection hole passage 34 and the first liquid passage 35. The needle 43 installed at the injection port of the syringe 4 passes through the sealing plug 36 and extends into the first liquid passage 35. A transfer member 7 connected to the spray gun body 2 is fixedly provided on the card seat 3. A second liquid passage 71 is provided in the transfer member 7. The liquid inlet of the spray gun body 2 is communicated with the first liquid passage 35 through the second liquid passage 71. When the flange of the syringe barrel 41 abuts against the upper end surface of the card seat 3, the needle 43 at the injection port of the syringe 4 passes through the sealing plug 36 from top to bottom and then inserts into the first liquid passage 35. The sealing plug 36 can play a role in blocking air, separating the first liquid passage 35, the second liquid passage 71 and the pipelines inside the spray gun body 2 from the outside, and preventing air from entering. The first liquid passage 35 penetrates through the lower end surface of the card seat 3 from top to bottom.

[0032] Specifically, in one embodiment, there is a gap between the lower end of the syringe barrel 41 of the syringe 4 and the inner wall of the groove 31 provided with the injection hole passage 34, preventing the injection port at the lower end of the syringe barrel 41 from being squeezed by the inner wall of the groove 31 and causing the lower end of the syringe barrel 41 to break. At the same time, it is also convenient for the air in the injection hole passage 34 to flow out, preventing the lower end of the syringe barrel 41 from blocking the outlet of the injection hole passage 34 and causing the gas pressure in the injection hole passage 34 to be too high, resulting in gas entering the first liquid passage 35 through the fine needle holes on the sealing plug 36.

[0033] Specifically, in one embodiment, the spray gun body 2 has a third liquid passage communicating with the nozzle. One end of the transfer member 7 is fixedly connected to the lower end surface of the card seat 3, and the other end of the transfer member 7 is inserted into the third liquid passage.

[0034] Specifically, in one embodiment, the spray gun body 2 further has a detection hole 22 communicating with the third liquid passage 21, and a detector for detecting the pressure of the third liquid passage is installed on the detection hole.

[0035] Specifically, in one embodiment, both the first liquid passage 35 and the second liquid passage 71 in the transfer member 7 are evacuated to a vacuum state, so that the second liquid passage 71 has suction. After the syringe 4 injects the paint into the first liquid passage 35, the suction of the second liquid passage 71 is used to suck the paint to the third liquid passage in the spray gun body 2.

[0036] Specifically, in one embodiment, the spray gun coating device further includes an infrared distance sensor 8 mounted on the base 1; a through hole 61 is provided on the extrusion member 6, and the ray of the infrared distance sensor 8 passes through the through hole 61 and irradiates on the plunger rod 42 of the syringe 4. The infrared distance sensor 8 is fixed on the base 1 and is located directly above the extrusion member 6. The position of the plunger rod 42 varies with the amount of coating in the syringe barrel 41. The transmitting end of the infrared distance sensor 8 emits infrared rays from top to bottom, and the infrared rays are reflected by the upper end surface of the plunger rod 42 to the receiving end of the infrared distance sensor 8. The distance of the plunger rod 42 is calculated through the time difference between transmission and reception, so that the linear motion driver 5 can accurately control the extrusion member 6 to accurately reach the upper end surface of the plunger rod 42 and contact the upper end surface of the plunger rod 42. The infrared distance sensor 8 can not only detect the position of the plunger rod 42 of the syringe 4, but also detect whether there is a syringe 4 on the card holder 3, so as to accurately control the movement of the linear motion driver 5.

[0037] As Figures 5 to 7 shown, specifically, in one embodiment, the linear motion driver 5 includes a first support 51 and a second support 52 both fixed on the base 1, a first synchronous pulley 53 rotatably mounted on the first support 51, a second synchronous pulley 54 rotatably mounted on the second support 52, a motor 50 whose output end is connected to the first synchronous pulley 55, a synchronous belt 55 sleeved on the first synchronous pulley 53 and the second synchronous pulley 54, and a driving block 56 fixed on the synchronous belt 55; the extrusion member 6 is fixed on the driving block 56. The first support 51 and the second support 52 are spaced apart in the vertical direction. The first synchronous pulley 53 is driven to rotate by the motor 50, so that the synchronous belt 55 moves, and finally the driving block 56 fixed on the synchronous belt 55 drives the extrusion member 6 to move.

[0038] Specifically, in one embodiment, the linear motion driver 5 further includes a first wheel shaft 510; a first bearing 511 and a second bearing 512 are rotatably mounted on the first support 51. A first mounting groove is provided between the first bearing 511 and the second bearing 512. One end of the first wheel shaft 510 is mounted on the first bearing 511, and the other end of the first wheel shaft 510 is mounted on the second bearing 512 and connected to the output end of the motor 50. The first synchronous pulley 53 is located in the first mounting groove and is fixedly mounted on the first wheel shaft 510. First key grooves are provided on both the first synchronous pulley 53 and the first wheel shaft 510. The first synchronous pulley 53 and the first wheel shaft 510 are fixedly connected through the cooperation of a first connecting key and the key grooves. The first synchronous pulley 53 and the first wheel shaft 510 are coaxial and rotate synchronously.

[0039] Specifically, in one embodiment, the linear motion driver 5 further includes a second wheel shaft 520; a third bearing 521 and a fourth bearing 522 are rotatably mounted on the second support 52. A second mounting groove is provided between the third bearing 521 and the fourth bearing 522. One end of the second wheel shaft 520 is mounted on the third bearing 521, and the other end of the second wheel shaft 520 is mounted on the fourth bearing 522. The second synchronous pulley 54 is located in the second mounting groove and fixedly mounted on the second wheel shaft 520. First key grooves are provided on both the second synchronous pulley 54 and the second wheel shaft 520. The second synchronous pulley 54 and the second wheel shaft 520 are fixedly connected through the cooperation of a second connecting key and the second key groove. The second synchronous pulley 54 and the second wheel shaft 520 are coaxial and rotate synchronously.

[0040] Specifically, in one embodiment, the linear motion driver 5 further includes a sleeper 57 fixed on the base 1, a guide rail 58 fixed on the sleeper 57, and a slider 59 slidably mounted on the guide rail 58; the slider 59 is fixed on the synchronous belt 55, and the slider 59 and the driving block 56 are symmetrically distributed on both sides of the synchronous belt 55. The moving direction of the slider 59 is the same as the moving direction of the synchronous belt 55. The synchronous belt 55 is annular, the sleeper 57 is located on the side of the synchronous belt 55, the guide rail 58 is fixed on the side of the sleeper 57, the guide rail 58 and the slider 59 are both located inside the inner ring of the synchronous belt 55, the synchronous belt 55 is clamped between the slider 59 and the driving block 56, the slider 59 and the driving block 56 are symmetrically distributed on both sides of the synchronous belt 55, and the slider 59 and the driving block 56 are relatively fixed.

[0041] Specifically, in one embodiment, the spray gun coating device further includes a photoelectric switch 9 mounted on the base 1 and an induction sheet 10 that is relatively fixed to the driving block 56 and is used to block the emitted light of the photoelectric switch 9. The photoelectric switch 9 is located above the base 1 and close to the first support 51. The photoelectric switch 9 has a ray emitting end and a receiving end, and the emitting end and the receiving end are horizontally spaced apart. The induction sheet 10 is fixed on the slider 59. When the driving block 56 is at the origin position (close to the first support 51), the induction sheet 10 blocks the ray emitted by the photoelectric switch 9, so as to detect whether the driving block 56 of the linear motion driver 5 is at the original position.

[0042] Specifically, in one embodiment, the linear motion driver 5 further includes a dust cover 11; a strip-shaped groove 12 is provided on the dust cover 11, a part of the synchronous belt 55 is located inside the dust cover, and the remaining part of the synchronous belt extends out from the strip-shaped groove 12. The first support 51, the second support 52, the first synchronous belt pulley 53, and the second synchronous belt pulley 54 are all located inside the dust cover 11, and the driving block 56 is located outside the dust cover 11. The first limiting block 111 and the second limiting block 112 are provided on the outside of the dust cover 11. The first limiting block and the second limiting block are respectively located at the upper and lower ends of the strip-shaped groove 12, and the first limiting block and the second limiting block can prevent the driving block 56 from sliding beyond the limit position when moving up and down and prevent the driving block 56 from colliding.

[0043] Specifically, in one embodiment, both the first limiting block and the second limiting block are provided with belt openings for the synchronous belt to pass through. When the synchronous belt rotates, it returns to the inside of the dust cover from the belt opening, making the dust-proof effect of the first synchronous belt pulley and the second synchronous belt pulley better.

[0044] Specifically, in one embodiment, a shaft hole 113 for the output shaft of the motor to penetrate is provided on the side surface of the dust cover 11.

[0045] The working process of the present invention: First, place the syringe into the groove of the card seat manually or by means of a manipulator, etc. After the syringe moves horizontally into the groove and then moves downward, the lower end surface of the flange of the syringe barrel abuts against the upper end surface of the base while the needle penetrates the sealing plug from top to bottom and enters the first liquid channel. The first notch and the second notch allow the hand or the manipulator to enter, realizing avoidance and preventing the card seat from interfering with the syringe. After the syringe is placed, the infrared distance sensor detects the distance position of the core rod of the injection needle, and then drives the pressing member to move downward through the linear motion driver and stops when the lower surface of the pressing member just touches the upper end of the core rod. When it is necessary to inject the coating into the spray gun body, start the linear motion driver, drive the pressing member to squeeze the core rod of the syringe through the linear motion driver, so that the coating on the syringe is injected into the spray gun body, and finally spray through the spray gun body. Different syringes can be filled with different coatings. When it is necessary to replace different coatings for spraying, only need to replace the syringe. The syringe can also be filled with cleaning fluids such as thinners. Before replacing different coatings, it is necessary to clean the channels of the card seat, the adapter, and the inner wall of the spray gun body. Inject the thinner through the above steps, and finally replace the syringe filled with other coatings.

[0046] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A spray gun coating device, characterized in that: It includes a base, a spray gun body mounted on the base, a card seat mounted on the base, a syringe mounted on the card seat, a linear motion driver mounted on the base, and an extrusion member mounted on the linear motion driver and used to drive the movement of the plunger of the syringe; The card seat is provided with a groove for the barrel of the syringe to be snapped into. The barrel of the syringe has a flange, and the flange abuts against the outside of the card seat. The liquid inlet of the spray gun body is communicated with the injection port of the syringe; The inner wall of the groove is further provided with an injection hole for the needle of the syringe to be inserted and a first liquid channel communicated with the injection hole. A sealing plug is arranged between the injection hole and the first liquid channel. The needle mounted at the injection port of the syringe passes through the sealing plug and extends into the first liquid channel. A transfer member connected to the spray gun body is fixedly arranged on the card seat. A second liquid channel is arranged in the transfer member. The liquid inlet of the spray gun body is communicated with the first liquid channel through the second liquid channel. The spray gun body has a third liquid channel communicated with the nozzle. The first liquid channel and the second liquid channel in the transfer member are both evacuated to a vacuum state, so that the second liquid channel has suction. After the syringe injects the paint into the first liquid channel, the suction of the second liquid channel is used to suck the paint onto the third liquid channel in the spray gun body; It further includes an infrared distance sensor mounted on the base. The extrusion member is provided with a through hole, and the ray of the infrared distance sensor passes through the through hole and irradiates on the plunger of the syringe; The linear motion driver includes a first support and a second support both fixed on the base, a first synchronous pulley rotatably mounted on the first support, a second synchronous pulley rotatably mounted on the second support, a motor with an output end connected to the first synchronous pulley, a synchronous belt sleeved on the first synchronous pulley and the second synchronous pulley, and a driving block fixed on the synchronous belt; The extrusion member is fixed on the driving block.

2. The spray gun coating device according to claim 1, wherein: The inner wall of the groove is provided with a first notch and a second notch, and the first notch and the second notch are symmetrically distributed with the axis of the barrel of the syringe as the center.

3. The spray gun coating device according to claim 1, wherein: The linear motion driver further includes a first wheel shaft. A first bearing and a second bearing are rotatably mounted on the first support. A first mounting groove is arranged between the first bearing and the second bearing. One end of the first wheel shaft is mounted on the first bearing, and the other end of the first wheel shaft is mounted on the second bearing and connected to the output end of the motor. The first synchronous pulley is located in the first mounting groove and fixedly mounted on the first wheel shaft.

4. A spray gun coating device according to claim 1, characterized in that: The linear motion driver further includes a second wheel shaft; a third bearing and a fourth bearing are rotatably mounted on the second support, a second mounting groove is provided between the third bearing and the fourth bearing, one end of the second wheel shaft is mounted on the third bearing, the other end of the second wheel shaft is mounted on the fourth bearing, and the second synchronous pulley is located in the second mounting groove and fixedly mounted on the second wheel shaft.

5. A spray gun coating device according to claim 1, characterized in that: The linear motion driver further includes a sleeper fixed on the base, a guide rail fixed on the sleeper, and a slider slidably mounted on the guide rail; the slider is fixed on the synchronous belt, and the slider and the driving block are symmetrically distributed on both sides of the synchronous belt.

6. The paint spraying device of a spray gun according to claim 1, characterized in that: It further includes a photoelectric switch mounted on the base and an induction sheet fixedly opposed to the driving block and used to block the emitted light of the photoelectric switch.

7. An airbrush coating device according to claim 1, characterized in that: The linear motion driver further includes a dust cover; a strip-shaped groove is provided on the dust cover, the synchronous belt extends out from the strip-shaped groove, the first support, the second support, the first synchronous pulley, and the second synchronous pulley are all located inside the dust cover, and the driving block is located outside the dust cover.

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