Pipe fitting machining surface spraying device and method

Abstract

The invention relates to the technical field of pipe fitting machining, in particular to a pipe fitting machining surface spraying device and method. Comprising a base assembly, a shifting assembly installed on the base assembly, a spraying assembly installed at the output end of the shifting assembly, an outer dust removing assembly installed on the spraying assembly, a first-stage driving assembly installed on the base assembly and a steering assembly connected to the output end of the first-stage driving assembly. The first-stage driving assembly is installed on the steering assembly, the second-stage driving assembly is installed on the steering assembly, the alignment assembly is movably connected to the steering assembly, the first-stage driving assembly is used for driving the steering assembly to rotate according to a preset angle, and the second-stage driving assembly is used for driving the alignment assembly to rotate; the gas spring pipe fitting is fixed, meanwhile, the small head end is turned over, the arc-shaped outer wall and the plane outer wall of the small head end are sprayed in the two directions, two coatings are formed at the internal corner, and the combination degree of the coating and the pipe fitting is better.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe fitting processing, and particularly relates to a surface spraying device and method for pipe fitting processing. Background Art

[0002] The gas spring assembly is a device that realizes the support and adjustment of an external load by changing the pressure of the internal gas based on the compressibility of the gas. The gas spring pipe fitting is the steel pipe used to make the gas spring assembly. Most of them are applied to the moving components of cylinders and oil cylinders, and it is a component with frequent movement and excessive operation. The tensile strength and fatigue resistance of the steel pipe used in the gas spring determine the service life of the gas spring assembly.

[0003] The design and manufacture of gas spring pipe fittings need to consider factors such as the pressure they bear, the environmental conditions of use, and the designed service life. Therefore, it is necessary to carry out anti-corrosion and rust-proof spraying treatment processes on their surfaces. Currently, the Al / Zn thin film protective layer is generally formed on the surface of gas spring pipe fittings by means of low-pressure cold spraying to avoid the influence of high temperature on the pipe fitting material and the coating material, increase the corrosion resistance of the steel pipe, and improve the impact toughness of the steel pipe. However, the tube end structure of the gas spring pipe fitting is inconsistent at both ends, showing a structure with one end large and one end small (the small end is used for assembling the piston part). The uniformity of the pipe body is good, and it is easier to control the spraying quality during spraying. However, when spraying the small end, because it forms an internal angle with the pipe body, local leakage points are likely to occur during spraying, and it is difficult to control the spraying quality.

[0004] Therefore, in view of the above problems, a spraying device and method can be designed to improve the spraying effect of the small end of the gas spring pipe fitting and avoid the occurrence of leakage points by flipping the pipe fitting and spraying it multiple times in multiple directions at its small end. Summary of the Invention

[0005] In order to overcome the problem that an internal angle is formed between the small end and the pipe body of the gas spring pipe fitting, local leakage points are likely to occur during spraying, and it is difficult to control the spraying quality.

[0006] The technical solution of the present invention is as follows: A surface spraying device for pipe fitting processing, which includes a base assembly, a displacement assembly installed on the base assembly, a spraying assembly installed on the output end of the displacement assembly, an external dust cleaning assembly installed on the spraying assembly, a primary driving assembly installed on the base assembly, a steering assembly connected to the output end of the primary driving assembly, a secondary driving assembly installed on the steering assembly, and an alignment assembly movably connected to the steering assembly. The displacement assembly is used to drive the spraying assembly to move horizontally or vertically. The gas in the spraying assembly can flow out through the external dust cleaning assembly. The primary driving assembly is used to drive the steering assembly to rotate at a preset angle. The alignment assembly is connected to the output end of the secondary driving assembly, and the secondary driving assembly is used to drive the alignment assembly to rotate; an exhaust assembly is installed on the alignment assembly, and a main positioning assembly is movably connected to the alignment assembly. The main positioning assembly is used to drive the gas to flow between the exhaust assembly and the alignment assembly; a second inflation assembly is installed on the main positioning assembly, and a limiting assembly is movably connected to the alignment assembly. A tertiary driving assembly is installed in the second inflation assembly, and the tertiary driving assembly is used to drive the gas to flow in the second inflation assembly. The second inflation assembly is used to control the movement of the limiting assembly.

[0007] Preferably, the base assembly includes a guide frame and a track groove opened on the guide frame. The track groove is an arc structure and the center of the circle is on the axis of the output end of the primary driving assembly. The primary driving assembly is used to drive the steering assembly to rotate along the track groove; the displacement assembly includes a longitudinal slide rail installed on the guide frame, a longitudinal moving machine movably installed on the longitudinal slide rail, a transverse slide rail installed on the longitudinal moving machine, a transverse moving machine movably installed on the transverse slide rail, a signal spring with one end connected to the transverse moving machine, and a sensor installed at one end of the transverse slide rail. The other end of the signal spring is connected to the sensor. The spraying assembly is installed on the transverse moving machine. The longitudinal moving machine is used to drive the spraying assembly to move vertically along the longitudinal slide rail, and the transverse moving machine is used to drive the spraying assembly to move horizontally along the transverse slide rail. The sensor is used to detect the tensile force value of the signal spring and send a signal to the control unit of the primary driving assembly.

[0008] Preferably, the spraying assembly includes a nozzle fixedly installed on the transverse moving machine, a pump pipe with one end connected inside the nozzle, an air duct arranged inside the nozzle, and a material pipe with one end connected inside the air duct. The other end of the pump pipe is connected to an external pump gas device, and the other end of the material pipe is connected to an external feeding device. The air duct is used to accelerate the gas conveyed by the pump pipe; the external dust cleaning assembly includes a wind ring installed on the nozzle, a plurality of first air holes opened on the wind ring, a first air duct connected between the air duct and the wind ring, and an electric valve installed on the first air duct. The gas flows between the wind ring and the air duct through the first air duct, and the electric valve is used to open or close the first air duct.

[0009] Preferably, the primary drive assembly includes a first motor mounted on the guide frame and a first gear mounted on the output end of the first motor. The first motor is used to drive the first gear to rotate, and the input end of the steering assembly is connected to the first gear. The steering assembly includes a support rod fixedly mounted on the first gear, a retaining ring fixedly mounted on the support rod, a connecting frame with one end connected to the support rod, a fixing ring connected to the other end of the connecting frame, and a sliding seat mounted on the fixing ring. The sliding seat is movably connected in the track groove, and the first motor is used to drive the retaining ring, the connecting frame, the fixing ring and the sliding seat to rotate.

[0010] Preferably, the secondary drive assembly includes a second motor mounted on the fixing ring and a second gear mounted on the output end of the second motor. The second motor is used to drive the second gear to rotate. The alignment assembly includes a toothed ring movably connected to the fixing ring, a collar fixedly mounted on the toothed ring, a shaft seat fixedly mounted on the collar, an air needle with one end fixedly mounted on the shaft seat, a plurality of air bags mounted on the air needle, and a plug bag mounted on the other end of the air needle. The toothed ring meshes with the second gear, and the second gear is used to drive the toothed ring, the collar, the shaft seat and the air needle to rotate. The air needle is of a hollow structure and is provided with channels on its surface. The air bags and the plug bag are communicated with the channels on the air needle, and gas can flow between the air needle, the air bags and the plug bag through the channels.

[0011] Preferably, when the large end of the pipe fitting approaches the main positioning assembly, the gas in the exhaust assembly flows into the alignment assembly; when the large end of the pipe fitting moves away from the main positioning assembly, the gas in the alignment assembly flows into the exhaust assembly; the exhaust assembly includes a gas hood installed in the ring sleeve and an air delivery pipe with one end connected to the gas hood, and the other end of the air delivery pipe is connected to the air needle, and the gas can flow between the gas hood and the air needle through the air delivery pipe; the main positioning assembly includes a pressure plate movably connected to the shaft seat, a tension sensor installed on the pressure plate, and a tension spring with one end connected to the tension sensor, the other end of the gas hood is connected to the pressure plate, and the other end of the tension spring is connected to the ring sleeve, and the tension sensor is used to detect the tension value of the tension spring and send a signal to the control unit of the three-stage driving assembly; when the large end approaches the pressure plate, the gas in the gas hood flows into the air needle, the airbag and the plug through the air delivery pipe; when the large end moves away from the pressure plate, the gas in the air needle, the airbag and the plug flows into the gas hood through the air delivery pipe; when the large end of the pipe fitting approaches the main positioning assembly and moves to a preset position, the second inflation assembly drives the limiting assembly to contact the port position of the pipe fitting; when the large end of the pipe fitting moves away from the main positioning assembly, the second inflation assembly drives the limiting assembly to leave the port position of the pipe fitting; the second inflation assembly includes a second air cylinder installed on the pressure plate, a second air delivery pipe with one end connected to the second air cylinder, and a third air cylinder connected to the other end of the second air delivery pipe, and the third air cylinder is installed in the shaft seat, and the gas flows between the second air cylinder and the third air cylinder through the second air delivery pipe; the limiting assembly includes a clamping plate movably connected in the shaft seat, a second plunger fixedly installed on the clamping plate, and a second return spring with one end connected to the second plunger, the second plunger is movably connected in the third air cylinder, and the other end of the second return spring is connected to the third air cylinder; when the gas flows from the second air cylinder into the third air cylinder, the clamping plate extends from the shaft seat and abuts against the large end; when the gas flows from the third air cylinder into the second air cylinder, the clamping plate retracts into the shaft seat and leaves the large end; the three-stage driving assembly includes a third motor installed in the second air cylinder, a first screw rod connected to the output end of the third motor, and a piston head threadedly connected to the first screw rod. When the large end of the pipe fitting approaches the pressure plate and moves to a preset position, the tension sensor detects that the tension value of the tension spring is F1 and sends a signal to the control unit of the third motor. The third motor is used to drive the first screw rod to rotate, the first screw rod is used to drive the piston head to move on the first screw rod, and the piston head is used to drive the gas to flow into or out of the second air cylinder.

[0012] Preferably, a first inflation assembly is installed on the main positioning assembly, a secondary positioning assembly is movably connected to the main positioning assembly, an inner dust cleaning assembly is provided on the alignment assembly, and gas flows between the first inflation assembly and the inner dust cleaning assembly; when the large end of the pipe fitting approaches the secondary positioning assembly, the gas in the first inflation assembly flows into the inner dust cleaning assembly; when the large end of the pipe fitting moves away from the secondary positioning assembly, the gas in the inner dust cleaning assembly flows into the first inflation assembly; a linkage assembly and a closing assembly are movably connected to the base assembly, the input end of the linkage assembly is connected to the output end of the primary drive assembly, the input end of the closing assembly is connected to the output end of the linkage assembly, and the linkage assembly is used to drive the closing assembly to move; when the small end of the pipe fitting rotates to the preset position M1, the linkage assembly drives the closing assembly to approach the small end of the pipe fitting; when the small end of the pipe fitting rotates to the preset position M2, the linkage assembly drives the closing assembly to move away from the small end of the pipe fitting.

[0013] Preferably, the first inflation assembly includes a first air cylinder installed on the pressing plate and a first air supply pipe with one end connected to the first air cylinder, the other end of the first air supply pipe is connected to the inner dust cleaning assembly, and gas flows between the first air cylinder and the inner dust cleaning assembly through the first air supply pipe; the secondary positioning assembly includes a pressing piece movably connected to the pressing plate, a first plunger fixedly connected to the pressing piece, and a first return spring with one end connected to the first plunger, the first plunger is movably connected inside the first air cylinder, the other end of the first return spring is connected inside the first air cylinder, and when the first plunger moves inside the first air cylinder, gas flows into or out of the first air cylinder; the inner dust cleaning assembly includes a second air duct provided inside the shaft seat and a second air hole opened on the surface of the shaft seat, the second air hole is communicated with the second air duct, the first air supply pipe is communicated with the second air duct, and gas flows into or out of the second air duct through the second air hole.

[0014] Preferably, the linkage assembly includes a toothed ring movably connected to the guide frame, a first linkage gear, a third linkage gear, and a second linkage gear fixedly connected to the first linkage gear, the toothed ring meshes with the first gear, the first linkage gear meshes with the toothed ring, the third linkage gear meshes with the second linkage gear, the first gear is used to drive the toothed ring to rotate, the toothed ring is used to drive the first linkage gear and the second linkage gear to rotate, and the second linkage gear is used to drive the third linkage gear to rotate; the closing assembly includes a slide rod movably connected to the guide frame, a second screw rod fixedly connected to one end of the slide rod, and a sealing plate fixedly connected to the other end of the slide rod, the second screw rod is threadedly connected inside the third linkage gear, and the third linkage gear is used to drive the second screw rod, the slide rod, and the sealing plate to move; when the small end of the pipe fitting rotates to the preset position M1, the sealing plate moves to the small end; when the small end of the pipe fitting rotates to the preset position M2, the sealing plate moves away from the small end of the pipe fitting.

[0015] A method for spraying the surface of a pipe fitting during processing, using a device for spraying the surface of a pipe fitting as described above, includes the following steps: S1: The user aligns the large - end of the pipe fitting horizontally with the end of the air needle, inserts it through the inside of the support ring, and sleeves it on the air needle along the axis direction of the air needle, making the large - end gradually approach the pressure plate. S2: When the large - end abuts against the pressure piece, the shaft seat enters the large - end. The pipe fitting first generates pressure on the pressure piece, overcoming the elastic force of the first return spring, causing the first plunger to move within the first air cylinder. The gas in the first air cylinder is pushed into the second air duct through the first air supply pipe and discharged through the second air hole, performing a wind purge on the inside of the pipe fitting, and blowing out the dust remaining in the pipe fitting through the small - end. S3: When the pressure piece is embedded in the pressure plate, the first plunger cannot move further. At this time, the pressure plate is subjected to the continuous pushing force of the moving pipe fitting, overcoming the elastic force of the tension spring, squeezing the air hood. The gas in the air hood flows into the air needle through the air delivery pipe, and the gas in the air needle further flows into the air bag and the plug bag. After the air bag and the plug bag expand, they closely fit the inner wall of the pipe fitting, locking the pipe fitting through friction. At the same time, the plug bag seals the connection between the small - end and the pipe body of the pipe fitting. S4: When the pressure plate and the collar abut against each other and cannot move further, at this time, the tension sensor detects that the tension value of the tension spring reaches F1 and sends a signal to the control unit of the third motor. S5: When the third motor starts, it drives the first screw rod to rotate. The rotating first screw rod drives the piston head to move within the second air cylinder. The gas in the second air cylinder is pushed into the third air cylinder through the second air supply pipe. The air pressure in the third air cylinder increases, overcoming the elastic force of the second return spring, pushing the second plunger to move. The second plunger drives the clamping plate to extend from the shaft seat and abut against the side wall of the large - end, limiting the pipe fitting. S6: The longitudinal moving machine and the transverse moving machine drive the nozzle into position. First, the electric valve is opened to connect the air duct and the first air duct. The transverse moving machine drives the nozzle to move from the small - end to the large - end. At the same time, the external air - pumping device flows into the air ring through the pump pipe, the air duct and the first air duct, and finally discharges from the first air hole, purging the surface of the pipe fitting. At the same time, the second motor drives the second gear to rotate. Through the meshing transmission of the second gear and the gear ring, the gear ring and the air needle are driven to rotate. The pipe fitting is driven to rotate by the friction between the air bag and the inner wall of the pipe fitting to clean the surface of the pipe fitting. S7: When the nozzle moves to the large - end, the external feeding device inputs particulate materials into the air duct through the material pipe. At the same time, the electric valve is closed. The high - speed gas flowing into the air duct drives the particulate materials to spray onto the pipe fitting. And the nozzle is driven by the transverse moving machine to slowly move towards the small - end side, successively spraying the large - end, the pipe body, the arc - shaped outer wall of the small - end and the inner corner. S8: When the nozzle moves to the small - end, the sensor detects that the stress value of the signal spring reaches F2 and sends a signal to the control unit of the first motor. S9: The first motor drives the first gear to rotate. Through the support rod and the connecting frame, it drives the support ring and the fixed ring to move along the arc direction of the track groove, causing the small head end to rotate from the M2 position to the M1 position. At the same time, the first gear transmits the power to the toothed ring, and then the toothed ring transmits it to the first linkage gear. Through the meshing drive of the second linkage gear and the third linkage gear, and the threaded drive of the third linkage gear and the second screw rod, the second screw rod is driven to move, making the sealing plate approach the small head end until it covers the open end of the small head end to form a seal; S10: The spray head then sprays the outer wall of the plane and the internal corner of the small head end. Combining with step S7, a secondary spraying area is formed at the internal corner.

[0016] Advantages of the present invention: 1. Through the steering component and the alignment component, while fixing the gas spring pipe fitting, the small head end is flipped, and the arc-shaped outer wall and the plane outer wall of the small head end are respectively sprayed from two directions. The spraying direction of the paint is perpendicular to the spraying surface, forming two layers of coatings at the internal corner, and the bonding degree between the paint and the pipe fitting is better; 2. The gas spring pipe fitting is locked by the method of internal support with the airbag. Compared with the traditional method of using clamps externally to fix, it will not cause local occlusion on the surface of the pipe fitting, facilitating the full spraying of the pipe fitting; 3. Through the setting of the limit component, after the pipe fitting is installed in place, the pipe fitting can be fixed by locking the large head end, preventing the pipe fitting from being pushed out of the air needle due to the elastic force of the tension spring, and the locking effect is better; 4. The open end of the small head end is blocked by the inflation of the plugging airbag, preventing paint particles from entering the interior of the pipe fitting through the open end of the small head end during the spraying of the small head end, eliminating the trouble of later cleaning; 5. Through the linkage of the primary drive component and the closing component, while the pipe fitting is flipped, the surface of the small head end is blocked, avoiding the ejection of particles into the interior of the small head end during the spraying of the plane outer wall of the small head end, and preventing the plugging airbag from being damaged by the impact of paint particles; 6. While protecting the plugging airbag, the closing component prevents the gas in the airbag from being disturbed by the impact of particles, avoiding affecting the friction locking effect between the airbag and the inner wall of the pipe fitting; 7. By the method of providing a high-speed air flow through an external air pumping device, the surface of the pipe fitting is purged and cleaned before spraying, making it easier for paint particles to bond with the surface of the pipe fitting; 8. By the cooperation of the first inflation component and the secondary positioning component, during the installation of the pipe fitting, the interior of the pipe fitting can be purged with wind, blowing out the dust and impurities remaining in the pipe fitting during the processing from the small head end, avoiding the remaining dust from affecting the fit between the inflated airbag and the inner wall of the pipe fitting, and ensuring a good frictional locking force. Description of the Drawings

[0017] Figure 1The figure shows a three-dimensional structural schematic diagram of the pipe fitting processing surface spraying device of the present invention; Figure 2 The figure shows a first sectional structural schematic diagram of the pipe fitting processing surface spraying device of the present invention; Figure 3 The figure shows a second sectional structural schematic diagram of the pipe fitting processing surface spraying device of the present invention; Figure 4 The figure shows a third sectional structural schematic diagram of the pipe fitting processing surface spraying device of the present invention; Figure 5 The figure shows a structural schematic diagram of the secondary drive assembly and the alignment assembly of the pipe fitting processing surface spraying device of the present invention; Figure 6 The figure shows a structural schematic diagram of the exhaust assembly and the main positioning assembly of the pipe fitting processing surface spraying device of the present invention; Figure 7 The figure shows a structural schematic diagram of the main positioning assembly, the first inflating assembly and the secondary positioning assembly of the pipe fitting processing surface spraying device of the present invention; Figure 8 The figure shows a structural schematic diagram of the second inflating assembly, the limiting assembly and the tertiary drive assembly of the pipe fitting processing surface spraying device of the present invention; Figure 9 The figure shows a structural schematic diagram of the primary drive assembly, the steering assembly, the linkage assembly and the closing assembly of the pipe fitting processing surface spraying device of the present invention; Figure 10 The figure shows the pipe fitting processing surface spraying device of the present invention Figure 2 Enlarged schematic diagram at position A; Figure 11 The figure shows the pipe fitting processing surface spraying device of the present invention Figure 2 Enlarged schematic diagram at position B; Figure 12 The figure shows the pipe fitting processing surface spraying device of the present invention Figure 3 Enlarged schematic diagram at position C; Figure 13 The figure shows the pipe fitting processing surface spraying device of the present invention Figure 3 Enlarged schematic diagram at position D; Figure 14 The figure shows the pipe fitting processing surface spraying device of the present invention Figure 4 Enlarged schematic diagram at position E.

[0018] Description of the reference numerals: 101, guide frame; 102, track groove; 201, longitudinal slide rail; 202, longitudinal moving machine; 203, transverse slide rail; 204, transverse moving machine; 205, signal spring; 206, inductor; 301, nozzle; 302, pump pipe; 303, air duct; 304, material pipe; 401, air ring; 402, first air hole; 403, first air duct; 404, electric valve; 501, first motor; 502, first gear; 601, support rod; 602, support ring; 603, connecting frame; 604, fixing ring; 605, sliding seat; 701, second motor; 702, second gear; 801, gear ring; 802, ring sleeve; 803, shaft seat; 804, air needle; 805, airbag; 806, airbag stopper; 901, air hood; 902, air delivery pipe; 1001, pressing plate; 1002, tension spring; 1003, tension sensor; 1101, first air cylinder; 1102, first air delivery pipe; 1201, pressing piece; 1202, first plunger; 1203, first return spring; 1301, second air duct; 1302, second air hole; 1401, second air cylinder; 1402, second air delivery pipe; 1403, third air cylinder; 1601, second plunger; 1602, second return spring; 1603, clamping plate; 1701, third motor; 1702, first screw rod; 1703, piston head; 1801, gear ring; 1802, first linkage gear; 1803, second linkage gear; 1804, third linkage gear; 1901, second screw rod; 1902, sliding rod; 1903, sealing plate; 1501, big head end; 1502, small head end. Detailed implementation mode

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Please refer to Figures 1 - 14, the present invention provides an embodiment: a surface spraying device for pipe fitting processing, comprising a base assembly, a displacement assembly mounted on the base assembly, a spraying assembly mounted on the output end of the displacement assembly, an external dust cleaning assembly mounted on the spraying assembly, a primary driving assembly mounted on the base assembly, a steering assembly connected to the output end of the primary driving assembly, a secondary driving assembly mounted on the steering assembly, and an alignment assembly movably connected to the steering assembly. The displacement assembly is used to drive the spraying assembly to move in the horizontal or vertical direction. The gas in the spraying assembly can flow out through the external dust cleaning assembly. The primary driving assembly is used to drive the steering assembly to rotate at a preset angle. The alignment assembly is connected to the output end of the secondary driving assembly, and the secondary driving assembly is used to drive the alignment assembly to rotate. An exhaust assembly is mounted on the alignment assembly, and a main positioning assembly is movably connected to the alignment assembly. The main positioning assembly is used to drive the gas to flow between the exhaust assembly and the alignment assembly. A second inflation assembly is mounted on the main positioning assembly, and a limiting assembly is movably connected to the alignment assembly. A tertiary driving assembly is mounted in the second inflation assembly, and the tertiary driving assembly is used to drive the gas to flow in the second inflation assembly. The second inflation assembly is used to control the movement of the limiting assembly. When the large end 1501 of the gas spring pipe fitting is loaded onto the alignment assembly, the main positioning assembly moves synchronously under the continuous thrust of the pipe fitting, controlling the gas in the exhaust assembly to be discharged into the alignment assembly, so that the alignment assembly locks the inner wall of the pipe fitting. At the same time of locking, the tertiary driving assembly runs simultaneously. Through the gas flow in the second inflation assembly, the limiting assembly locks the large end 1501 of the pipe fitting on the alignment assembly. First, the displacement assembly controls the spraying assembly to move along the axis of the pipe fitting, and the surface of the pipe fitting is purged and cleaned by an external air pumping device and the external dust cleaning assembly, and then the spraying operation is carried out (while cleaning and spraying, the primary driving assembly controls the alignment assembly to keep rotating, and the alignment assembly drives the locked pipe fitting to rotate together). After the arc-shaped outer wall of the small end 1502 is sprayed, the steering assembly drives the alignment assembly and the locked pipe fitting to rotate along the base assembly (the rotation angle can be set according to the program as needed. In this technical solution, it is 90 degrees, and in actual application, multiple rotation angles can also be designed. After each rotation to an angle, the spraying assembly performs a spraying operation on the small end 1502), and then the spraying assembly sprays the flat outer wall of the small end 1502. After two or more sprays, a thicker and more complete coating is obtained at the fillet formed between the arc-shaped outer wall and the flat outer wall of the small end 1502).

[0021] Please refer to Figures 1 - 4 、 Figure 11 and Figure 14, in this embodiment, the base assembly includes a guide frame 101 and a track groove 102 formed in the guide frame 101. The track groove 102 is an arc-shaped structure and the center of the circle is on the axis of the output end of the primary drive assembly. The primary drive assembly is used to drive the steering assembly to rotate along the track groove 102; the displacement assembly includes a longitudinal slide rail 201 mounted on the guide frame 101, a longitudinal moving machine 202 movably mounted on the longitudinal slide rail 201, a transverse slide rail 203 mounted on the longitudinal moving machine 202, a transverse moving machine 204 movably mounted on the transverse slide rail 203, a signal spring 205 with one end connected to the transverse moving machine 204, and a sensor 206 mounted at one end of the transverse slide rail 203. The other end of the signal spring 205 is connected to the sensor 206. The spraying assembly is mounted on the transverse moving machine 204. The longitudinal moving machine 202 is used to drive the spraying assembly to move vertically along the longitudinal slide rail 201, and the transverse moving machine 204 is used to drive the spraying assembly to move horizontally along the transverse slide rail 203. The sensor 206 is used to detect the tensile value of the signal spring 205 and send a signal to the control unit of the primary drive assembly; the spraying assembly includes a nozzle 301 fixedly mounted on the transverse moving machine 204, a pump pipe 302 with one end connected inside the nozzle 301, an air duct 303 provided inside the nozzle 301, and a material pipe 304 with one end connected inside the air duct 303. The other end of the pump pipe 302 is connected to an external pump air device, and the other end of the material pipe 304 is connected to an external feeding device. The air duct 303 is used to accelerate the gas transported by the pump pipe 302; the external dust cleaning assembly includes a wind ring 401 mounted on the nozzle 301, a plurality of first air holes 402 formed in the wind ring 401, a first air duct 403 connecting the air duct 303 and the wind ring 401, and an electric valve 404 mounted on the first air duct 403. The gas flows between the wind ring 401 and the air duct 303 through the first air duct 403, and the electric valve 404 is used to open or close the first air duct 403; before the spraying operation (when the pipe fitting is in a horizontal state), the transverse moving machine 204 drives the nozzle 301 to move from one side of the small end 1502 of the pipe fitting to the side of the large end 1501 (in actual application, the transverse moving machine 204 and the transverse slide rail 203, and the longitudinal moving machine 202 and the longitudinal slide rail 201 can all adopt devices such as linear motors). During the movement, the electric valve 404 is in an open state, and the first air duct 403 is communicated with the air duct 303. The external pump air device inputs high-speed air flow through the pump pipe 302 into the air duct 303, and then obtains secondary acceleration through the structure of the air duct 303 (including an expansion section and a converging section, such as a Laval nozzle, etc.). The gas flows into the wind ring 401 through the first air duct 403 and finally blows out from the first air holes 402 to purge and clean the outer wall of the pipe fitting (during the entire purging process, the pipe fitting is in a rotating state). During the movement of the nozzle 301, the stress value of the signal spring 205 changes and is detected by the sensor 206.

[0022] Please refer to Figures 1 - 4 and Figures 9 - 10, in this embodiment, the primary drive assembly includes a first motor 501 mounted on the guide frame 101 and a first gear 502 mounted on the output end of the first motor 501. The first motor 501 is used to drive the first gear 502 to rotate, and the input end of the steering assembly is connected to the first gear 502. The steering assembly includes a support rod 601 fixedly mounted on the first gear 502, a support ring 602 fixedly mounted on the support rod 601, a connecting frame 603 with one end connected to the support rod 601, a fixing ring 604 connected to the other end of the connecting frame 603, and a sliding seat 605 mounted on the fixing ring 604. The sliding seat 605 is movably connected in the track groove 102. The first motor 501 is used to drive the support ring 602, the connecting frame 603, the fixing ring 604, and the sliding seat 605 to rotate. The first motor 501 outputs power through the first gear 502 to control the rotation of the support rod 601 directly connected to the first gear 502 (in this solution, it is a 90-degree flip, and in actual applications, multiple flip angles can also be set within 90 degrees according to needs). The support ring 602 is customized to fit the pipe body of the pipe fitting (maintaining a sufficient gap with the pipe body to avoid coating peeling caused by scratching when the pipe fitting rotates). The connecting frame 603 is used to drive the fixing ring 604 to rotate together, and the fixing ring 604 stabilizes the direction through the movement of the sliding seat 605 in the track groove 102.

[0023] Please refer to Figures 1 - 5 , Figure 10 and Figure 13, in this embodiment, the secondary driving assembly includes a second motor 701 mounted on the fixed ring 604 and a second gear 702 mounted on the output end of the second motor 701. The second motor 701 is used to drive the second gear 702 to rotate; the alignment assembly includes a gear ring 801 movably connected to the fixed ring 604, a collar 802 fixedly mounted on the gear ring 801, a shaft seat 803 fixedly mounted on the collar 802, an air needle 804 with one end fixedly mounted on the shaft seat 803, a plurality of air bags 805 mounted on the air needle 804, and a plug bag 806 mounted on the other end of the air needle 804. The gear ring 801 meshes with the second gear 702. The second gear 702 is used to drive the gear ring 801, the collar 802, the shaft seat 803, and the air needle 804 to rotate. The air needle 804 is of a hollow structure and is provided with channels on its surface. The air bags 805 and the plug bag 806 are connected to the channels on the air needle 804, and gas can flow between the air needle 804, the air bags 805, and the plug bag 806 through the channels; the second motor 701 outputs power to the gear ring 801 through the second gear 702, controls the rotation of the gear ring 801, and drives the collar 802, the shaft seat 803, and the air needle 804 (including other components on the collar 802, the shaft seat 803, and the air needle 804) fixed to the gear ring 801 to rotate. After the air bags 805 and the plug bag 806 expand, they will closely adhere to the inner wall of the pipe fitting (gas can flow into the air bags 805 and the plug bag 806 through the channels on the air needle 804), forming a frictional resistance, and driving the pipe fitting to rotate together through the frictional resistance (it should be noted that the frictional resistance is greater than the self-gravity of the pipe fitting and the centrifugal force during rotation).

[0024] Please refer to Figures 1 - 8 、 Figure 10 and Figures 12 - 13, in this embodiment, when the large head end 1501 of the pipe fitting approaches the main positioning assembly, the gas in the exhaust assembly flows into the alignment assembly; when the large head end 1501 of the pipe fitting moves away from the main positioning assembly, the gas in the alignment assembly flows into the exhaust assembly; the exhaust assembly includes an air hood 901 installed inside the collar 802 and an air delivery pipe 902 with one end connected to the air hood 901, and the other end of the air delivery pipe 902 is connected inside the air needle 804, and the gas can flow between the air hood 901 and the air needle 804 through the air delivery pipe 902; the main positioning assembly includes a pressing plate 1001 movably connected to the shaft seat 803, a tensile force sensor 1003 installed on the pressing plate 1001, and a tension spring 1002 with one end connected to the tensile force sensor 1003, the other end of the air hood 901 is connected to the pressing plate 1001, the other end of the tension spring 1002 is connected to the collar 802, and the tensile force sensor 1003 is used to detect the tensile force value of the tension spring 1002 and send a signal to the control unit of the three-stage drive assembly; when the large head end 1501 approaches the pressing plate 1001, the gas in the air hood 901 flows into the air needle 804, the airbag 805, and the plugging bladder 806 through the air delivery pipe 902; when the large head end 1501 moves away from the pressing plate 1001, the gas in the air needle 804, the airbag 805, and the plugging bladder 806 flows into the air hood 901 through the air delivery pipe 902; when the large head end 1501 of the pipe fitting approaches the main positioning assembly and moves to a preset position, the second inflation assembly drives the limiting assembly to contact the port position of the pipe fitting; when the large head end 1501 of the pipe fitting moves away from the main positioning assembly, the second inflation assembly drives the limiting assembly to leave the port position of the pipe fitting; the second inflation assembly includes a second air cylinder 1401 installed on the pressing plate 1001, a second air delivery pipe 1402 with one end connected to the second air cylinder 1401, and a third air cylinder 1403 connected to the other end of the second air delivery pipe 1402, the third air cylinder 1403 is installed inside the shaft seat 803, and the gas flows between the second air cylinder 1401 and the third air cylinder 1403 through the second air delivery pipe 1402; the limiting assembly includes a clamping plate 1603 movably connected inside the shaft seat 803, a second plunger 1601 fixedly installed on the clamping plate 1603, and a second return spring 1602 with one end connected to the second plunger 1601, the second plunger 1601 is movably connected inside the third air cylinder 1403, and the other end of the second return spring 1602 is connected to the third air cylinder 1403; when the gas flows from the second air cylinder 1401 into the third air cylinder 1403, the clamping plate 1603 extends from the shaft seat 803 and abuts against the large head end 1501; when the gas flows from the third air cylinder 1403 into the second air cylinder 1401, the clamping plate 1603 retracts into the shaft seat 803 and leaves the large head end 1501;The three - stage drive assembly includes a third motor 1701 installed in the second air cylinder 1401, a first screw rod 1702 connected to the output end of the third motor 1701, and a piston head 1703 threadedly connected to the first screw rod 1702. When the large - end 1501 of the pipe fitting approaches the pressure plate 1001 and moves to a preset position, the tension sensor 1003 detects that the tension value of the tension spring 1002 is F1, and sends a signal to the control unit of the third motor 1701. The third motor 1701 is used to drive the first screw rod 1702 to rotate. The first screw rod 1702 is used to drive the piston head 1703 to move on the first screw rod 1702. The piston head 1703 is used to drive gas to flow into or out of the second air cylinder 1401. When installing the pipe fitting, at the moment when the large - end 1501 contacts the pressure plate 1001, it generates a thrust on the pressure plate 1001, causing the pressure plate 1001 to move on the shaft seat 803 and compress the air hood 901. The gas in the air hood 901 gradually flows into the air needle 804 through the air delivery pipe 902, and then flows into the airbag 805 and the plug - bag 806 through the channels on the air needle 804, causing the airbag 805 to expand and tightly adhere to the inner wall of the pipe fitting, while the plug - bag 806 also expands and abuts against the connection between the open end of the small - end 1502 and the pipe body to prevent paint particles during spraying from entering the pipe fitting through the small - end 1502 (it should be noted that the air hood 901 completely covers the shaft seat 803 in the natural state, and the large - end 1501 of the pipe fitting contacts the pressure plate 1001 only when it moves near the shaft seat 803, that is, the airbag 805 starts to be inflated after the pipe fitting has been sleeved on the air needle 804 for a certain distance). When the pressure plate 1001 abuts against the collar 802 (at this time, it cannot move further and the air hood 901 is compressed to the minimum), the first tension sensor 1003 detects that the tension value of the tension spring 1002 is F1 at this time, sends a signal to the third motor 1701, controls the first screw rod 1702 to rotate. Under the action of screw - thread transmission, the piston head 1703 moves in the second air cylinder 1401, and the gas in the second air cylinder 1401 is sent into the third air cylinder 1403 through the second air delivery pipe 1402. The increased pressure in the third air cylinder 1403 will push the second plunger 1601 to move, eject the clamping plate 1603 originally retracted in the shaft seat 803, and support it on the side wall of the large - end 1501 to prevent the pipe fitting from detaching from the pressure plate 1001.;

[0025] Please refer to Figures 1 - 7 、 Figures 9 - 10 、 Figure 12 and Figure 14, in this embodiment, a first inflating component is installed on the main positioning component, a secondary positioning component is movably connected to the main positioning component, an internal dust cleaning component is arranged on the alignment component, and gas flows between the first inflating component and the internal dust cleaning component; when the large end 1501 of the pipe fitting approaches the secondary positioning component, the gas in the first inflating component flows into the internal dust cleaning component; when the large end 1501 of the pipe fitting moves away from the secondary positioning component, the gas in the internal dust cleaning component flows into the first inflating component; a linkage component and a closing component are movably connected to the base component, the input end of the linkage component is connected to the output end of the first-level driving component, the input end of the closing component is connected to the output end of the linkage component, and the linkage component is used to drive the closing component to move; when the small end 1502 of the pipe fitting rotates to the preset position M1, the linkage component drives the closing component to approach the small end 1502 of the pipe fitting; when the small end 1502 of the pipe fitting rotates to the preset position M2, the linkage component drives the closing component to move away from the small end 1502 of the pipe fitting; when installing the pipe fitting, compared with the main positioning component, the large end 1501 will contact prior to the secondary positioning component, and by the pressure on the secondary positioning component, the gas in the first inflating component is controlled to flow into the internal dust cleaning component (it should be noted that at this time, a part of the shaft seat 803 enters the large end 1501 of the pipe fitting, and the pressing plate 1001 has not moved yet, so the air hood 901 does not inflate the airbag 805, and there is enough gap between the air needle 804 and the inner wall of the pipe fitting for gas to flow through), the internal dust cleaning component discharges gas into the pipe fitting, and blows the dust in the pipe out through the small end 1502. After the spraying operation is completed when the pipe fitting is in a horizontal state, the pipe fitting is flipped by controlling with the first-level driving component, and the first-level driving component simultaneously transmits power to the closing component through the linkage component, and the closing component moves to the small end 1502 that reaches the position M1 after flipping, and shields and closes the small end 1502.

[0026] Please refer to Figures 2 - 3 , Figures 6 - 7 , Figure 10 and Figure 12, in this embodiment, the first inflation assembly includes a first air cylinder 1101 installed on the pressing plate 1001 and a first air delivery pipe 1102 with one end connected to the first air cylinder 1101. The other end of the first air delivery pipe 1102 is connected to the inner dust cleaning assembly, and gas flows between the first air cylinder 1101 and the inner dust cleaning assembly through the first air delivery pipe 1102; the secondary positioning assembly includes a pressing piece 1201 movably connected to the pressing plate 1001, a first plunger 1202 fixedly connected to the pressing piece 1201, and a first return spring 1203 with one end connected to the first plunger 1202. The first plunger 1202 is movably connected inside the first air cylinder 1101, and the other end of the first return spring 1203 is connected inside the first air cylinder 1101. When the first plunger 1202 moves inside the first air cylinder 1101, gas flows into or out of the first air cylinder 1101; the inner dust cleaning assembly includes a second air duct 1301 arranged inside the shaft seat 803 and a second air hole 1302 opened on the surface of the shaft seat 803. The second air hole 1302 is communicated with the second air duct 1301, and the first air delivery pipe 1102 is communicated with the second air duct 1301. Gas flows into or out of the second air duct 1301 through the second air hole 1302; the large end 1501 of the pipe fitting first contacts the pressing piece 1201 (under the elastic action of the first return spring 1203, the first plunger 1202 will drive the pressing piece 1201 to protrude from the pressing plate 1001, and the elastic force of the first return spring 1203 is less than the elastic force of the tension spring 1002. Therefore, when the pressing piece 1201 is pushed by the pipe fitting, the pressing plate 1001 will not move). Overcoming the elastic force of the first return spring 1203, through the pressing piece 1201, the first plunger 1202 is made to move inside the first air cylinder 1101, so that the gas inside the first air cylinder 1101 flows into the second air duct 1301 through the first air delivery pipe 1102 and is discharged from the second air hole 1302 to blow the inside of the pipe fitting (in practical applications, the cross-section of the first air cylinder 1101 is designed to be large enough, and the aperture of the second air hole 1302 is designed into a structure similar to a Laval nozzle according to needs, so that the gas can obtain a higher speed and flow rate when ejected, and the cleaning effect is better).

[0027] Please refer to Figures 3 - 6, in this embodiment, the linkage assembly includes a gear ring 1801 movably connected to the guide frame 101, a first linkage gear 1802, a third linkage gear 1804, and a second linkage gear 1803 fixedly connected to the first linkage gear 1802. The gear ring 1801 meshes with the first gear 502, the first linkage gear 1802 meshes with the gear ring 1801, and the third linkage gear 1804 meshes with the second linkage gear 1803. The first gear 502 is used to drive the rotation of the gear ring 1801, the gear ring 1801 is used to drive the rotation of the first linkage gear 1802 and the second linkage gear 1803, and the second linkage gear 1803 is used to drive the rotation of the third linkage gear 1804; the closing assembly includes a slide bar 1902 movably connected to the guide frame 101, a second screw 1901 fixedly connected to one end of the slide bar 1902, and a sealing plate 1903 fixedly connected to the other end of the slide bar 1902. The second screw 1901 is threadedly connected to the third linkage gear 1804, and the third linkage gear 1804 is used to drive the movement of the second screw 1901, the slide bar 1902, and the sealing plate 1903; when the small end 1502 of the pipe fitting rotates to the preset position M1, the sealing plate 1903 moves to the small end 1502; when the small end 1502 of the pipe fitting rotates to the preset position M2, the sealing plate 1903 moves away from the small end 1502 of the pipe fitting. During the flipping process of the pipe fitting (the small end 1502 flips from the M2 position to the M1 position), the first gear 502 controls the rotation of the gear ring 1801 through the meshing drive with the gear ring 1801. The gear ring 1801 then transmits the power to the first linkage gear 1802 to control the rotation of the first linkage gear 1802. The second linkage gear 1803 follows the rotation of the first linkage gear 1802 and, through the meshing drive with the third linkage gear 1804 and the threaded drive between the third linkage gear 1804 and the second screw 1901, drives the movement of the second screw 1901, causing the slide bar 1902 to extend on the guide frame 101, so that the sealing plate 1903 approaches the small end 1502 until it covers the open end of the small end 1502 to form a seal. During spraying, the coating particles cannot enter through the open end of the small end 1502 and be ejected onto the plugging bladder 806, avoiding damage to the plugging bladder 806 or affecting the air pressure balance among the plugging bladder 806, the air needle 804, and the airbag 805.

[0028] Please refer to Figures 1 - 14 , in this embodiment, the present invention provides a method for spraying the surface of a pipe fitting during processing. Using a pipe fitting surface spraying device as described above, it includes the following steps: S1: The user aligns the large-head end 1501 of the pipe fitting horizontally with the end of the air needle 804 and inserts it into the inside of the support ring 602 (the support ring 602 is customized according to the outer shape of the pipe body of the pipe fitting and can be polished to reduce the friction with the outer wall of the pipe fitting), and slews it on the air needle 804 along the axial direction of the air needle 804, making the large-head end 1501 gradually approach the pressing plate 1001; S2: When the large-head end 1501 abuts against the pressing piece 1201, the shaft seat 803 enters the large-head end 1501. First, the pipe fitting generates a pressure on the pressing piece 1201, overcoming the elastic force of the first return spring 1203 (the elastic force of the first return spring 1203 is less than the elastic force of the tension spring 1002. When the first return spring 1203 is stretched, the tension spring 1002 does not deform), causing the first plunger 1202 to move in the first air cylinder 1101, pushing the gas in the first air cylinder 1101 into the second air duct 1301 through the first air delivery pipe 1102 and discharging it through the second air hole 1302 to conduct a wind purge inside the pipe fitting, and blowing out the dust remaining inside the pipe fitting through the small-head end 1502; S3: When the pressing piece 1201 is embedded in the pressing plate 1001, the first plunger 1202 cannot move further. At this time, the pressing plate 1001 receives the continuous pushing force of the moving pipe fitting, overcoming the elastic force of the tension spring 1002, squeezing the air hood 901, causing the gas in the air hood 901 to flow into the air needle 804 through the air delivery pipe 902, and the gas in the air needle 804 further flows into the airbag 805 and the plugging bladder 806 (through the channels between the airbag 805 and the plugging bladder 806. It should be noted that the air needle 804 penetrates through all the airbags 805 and plugging bladders 806). After the airbag 805 and the plugging bladder 806 expand, they closely adhere to the inner wall of the pipe fitting, locking the pipe fitting through friction. At the same time, the plugging bladder 806 seals the connection between the small-head end 1502 and the pipe body of the pipe fitting; S4: When the pressing plate 1001 and the ring sleeve 802 abut against each other and cannot move further, at this time, the tension sensor 1003 detects that the tension value of the tension spring 1002 reaches F1 and sends a signal to the control unit of the third motor 1701; S5: When the third motor 1701 starts, it drives the first screw rod 1702 to rotate. The rotating first screw rod 1702 drives the piston head 1703 to move in the second air cylinder 1401, pushing the gas in the second air cylinder 1401 into the third air cylinder 1403 through the second air delivery pipe 1402. The air pressure in the third air cylinder 1403 increases, overcoming the elastic force of the second return spring 1602, pushing the second plunger 1601 to move. The second plunger 1601 drives the clamping plate 1603 to protrude from the shaft seat 803 and abut against the side wall of the large-head end 1501 to limit the position of the pipe fitting; S6: Drive the nozzle 301 into position by the longitudinal moving machine 202 and the transverse moving machine 204. First, open the electric valve 404 to connect the air duct 303 and the first air duct 403. The transverse moving machine 204 drives the nozzle 301 to move from the small head end 1502 to the large head end 1501. At the same time, an external air pumping device flows into the air ring 401 through the pump pipe 302, the air duct 303 and the first air duct 403, and finally discharges from the first air hole 402 to blow the surface of the pipe fitting (it should be noted that blowing cannot be carried out during the spraying process, which will affect the spraying speed of the coating particles). At the same time, the second motor 701 drives the second gear 702 to rotate. Through the meshing transmission of the second gear 702 and the gear ring 801, drive the gear ring 801 and the air needle 804 to rotate, and drive the pipe fitting to rotate by using the friction force between the air bag 805 and the inner wall of the pipe fitting (the air bag 805 can be designed with a rough surface to increase the friction effect) to clean the surface of the pipe fitting; S7: When the nozzle 301 moves to the large head end 1501, an external feeding device inputs particulate material into the air duct 303 through the material pipe 304. At the same time, the electric valve 404 is closed, and the high-speed gas flowing into the air duct 303 drives the particulate material to be sprayed onto the pipe fitting (the pipe fitting remains rotating during the spraying process), and the nozzle 301 is driven by the transverse moving machine 204 to slowly move towards the small head end 1502 side, and successively spray the arc-shaped outer walls and the inner corners of the large head end 1501, the pipe body and the small head end 1502; S8: When the nozzle 301 moves to the small head end 1502, the sensor 206 detects that the stress value of the signal spring 205 reaches F2 and sends a signal to the control unit of the first motor 501; S9: The first motor 501 drives the first gear 502 to rotate. Through the support rod 601 and the connecting frame 603, drive the support ring 602 and the fixed ring 604 to move along the arc direction of the track groove 102, so that the small head end 1502 rotates from the M2 position to the M1 position. At the same time, the first gear 502 transmits the power to the gear ring 1801, and then the gear ring 1801 transmits it to the first linkage gear 1802. Through the meshing transmission of the second linkage gear 1803 and the third linkage gear 1804, and the threaded transmission of the third linkage gear 1804 and the second screw rod 1901, drive the second screw rod 1901 to move, so that the sealing plate 1903 approaches the small head end 1502 until it covers the open end of the small head end 1502 to form a seal; S10: The nozzle 301 then sprays the flat outer wall and the inner corner of the small head end 1502 (the pipe fitting remains rotating during the spraying process). Combining with step S7, a secondary spraying area is formed at the inner corner.

Claims

1. A spraying device for the surface of pipe fittings, characterized in that: It includes a base component, a displacement component installed on the base component, a spraying component installed on the output end of the displacement component, an external dust cleaning component installed on the spraying component, a primary driving component installed on the base component, a steering component connected to the output end of the primary driving component, a secondary driving component installed on the steering component, and an alignment component movably connected to the steering component. The displacement component is used to drive the spraying component to move horizontally or vertically. The gas in the spraying component can flow out through the external dust cleaning component. The primary driving component is used to drive the steering component to rotate at a preset angle. The alignment component is connected to the output end of the secondary driving component, and the secondary driving component is used to drive the alignment component to rotate; An exhaust component is installed on the alignment component, and a main positioning component is movably connected to the alignment component. The main positioning component is used to drive the gas to flow between the exhaust component and the alignment component; A second inflation component is installed on the main positioning component, and a limit component is movably connected to the alignment component. A tertiary driving component is installed in the second inflation component. The tertiary driving component is used to drive the gas to flow in the second inflation component, and the second inflation component is used to control the movement of the limit component.

2. The surface spraying device for pipe fitting processing according to claim 1, wherein: The base component includes a guide frame (101) and a track groove (102) opened on the guide frame (101). The track groove (102) is an arc structure and the center of the circle is on the axis of the output end of the primary driving component. The primary driving component is used to drive the steering component to rotate along the track groove (102); The displacement component includes a longitudinal slide rail (201) installed on the guide frame (101), a longitudinal moving machine (202) movably installed on the longitudinal slide rail (201), a transverse slide rail (203) installed on the longitudinal moving machine (202), a transverse moving machine (204) movably installed on the transverse slide rail (203), a signal spring (205) with one end connected to the transverse moving machine (204), and an inductor (206) installed at one end of the transverse slide rail (203). The other end of the signal spring (205) is connected to the inductor (206). The spraying component is installed on the transverse moving machine (204). The longitudinal moving machine (202) is used to drive the spraying component to move vertically along the longitudinal slide rail (201), the transverse moving machine (204) is used to drive the spraying component to move horizontally along the transverse slide rail (203), and the inductor (206) is used to detect the tensile value of the signal spring (205) and send a signal to the control unit of the primary driving component.

3. The surface spraying device for pipe fitting processing according to claim 2, wherein: The spraying component includes a nozzle (301) fixedly installed on the transverse moving machine (204), a pump tube (302) with one end connected inside the nozzle (301), an air duct (303) arranged inside the nozzle (301), and a material tube (304) with one end connected inside the air duct (303). The other end of the pump tube (302) is connected to an external pump gas device, the other end of the material tube (304) is connected to an external feeding device, and the air duct (303) is used to accelerate the gas transported by the pump tube (302); The external dust cleaning component includes an air ring (401) installed on the nozzle (301), a number of first air holes (402) opened on the air ring (401), a first air duct (403) connected between the air duct (303) and the air ring (401), and an electric valve (404) installed on the first air duct (403). Gas flows between the air ring (401) and the air duct (303) through the first air duct (403), and the electric valve (404) is used to open or close the first air duct (403).

4. A surface spraying device for pipe fitting processing according to claim 3, characterized in that: The primary drive component includes a first motor (501) installed on the guide frame (101) and a first gear (502) installed on the output end of the first motor (501). The first motor (501) is used to drive the first gear (502) to rotate, and the input end of the steering component is connected to the first gear (502); The steering component includes a support rod (601) fixedly installed on the first gear (502), a support ring (602) fixedly installed on the support rod (601), a connecting frame (603) with one end connected to the support rod (601), a fixed ring (604) connected to the other end of the connecting frame (603), and a sliding seat (605) installed on the fixed ring (604). The sliding seat (605) is movably connected in the track groove (102), and the first motor (501) is used to drive the support ring (602), the connecting frame (603), the fixed ring (604), and the sliding seat (605) to rotate.

5. The surface spraying device for pipe fitting processing according to claim 4, wherein: The secondary drive component includes a second motor (701) installed on the fixed ring (604) and a second gear (702) installed on the output end of the second motor (701). The second motor (701) is used to drive the second gear (702) to rotate; The alignment component includes a gear ring (801) movably connected to the fixed ring (604), a ring sleeve (802) fixedly installed on the gear ring (801), a shaft seat (803) fixedly installed on the ring sleeve (802), an air needle (804) with one end fixedly installed on the shaft seat (803), a number of air bags (805) installed on the air needle (804), and a plug bag (806) installed on the other end of the air needle (804). The gear ring (801) meshes with the second gear (702), and the second gear (702) is used to drive the gear ring (801), the ring sleeve (802), the shaft seat (803), and the air needle (804) to rotate. The air needle (804) is of a hollow structure and has channels arranged on its surface. The air bags (805) and the plug bag (806) are connected to the channels on the air needle (804), and gas can flow between the air needle (804), the air bags (805), and the plug bag (806) through the channels.

6. The surface spraying device for pipe fitting processing according to claim 5, characterized in that: When the large end (1501) of the pipe fitting approaches the main positioning component, the gas in the exhaust component flows into the alignment component; when the large end (1501) of the pipe fitting moves away from the main positioning component, the gas in the alignment component flows into the exhaust component; The exhaust assembly includes an air hood (901) installed inside the collar (802) and an air delivery pipe (902) with one end connected to the air hood (901). The other end of the air delivery pipe (902) is connected inside the air needle (804). Gas can flow between the air hood (901) and the air needle (804) through the air delivery pipe (902). The main positioning assembly includes a pressure plate (1001) movably connected to the shaft seat (803), a tension sensor (1003) installed on the pressure plate (1001), and a tension spring (1002) with one end connected to the tension sensor (1003). The other end of the air hood (901) is connected to the pressure plate (1001), and the other end of the tension spring (1002) is connected to the collar (802). The tension sensor (1003) is used to detect the tension value of the tension spring (1002) and send a signal to the control unit of the three-stage drive assembly. When the large head end (1501) approaches the pressure plate (1001), the gas in the air hood (901) flows into the air needle (804), the airbag (805), and the occlusion bag (806) through the air delivery pipe (902). When the large head end (1501) moves away from the pressure plate (1001), the gas in the air needle (804), the airbag (805), and the occlusion bag (806) flows into the air hood (901) through the air delivery pipe (902). When the large head end (1501) of the pipe fitting approaches the main positioning assembly and moves to a preset position, the second inflation assembly drives the limit assembly to contact the port position of the pipe fitting. When the large head end (1501) of the pipe fitting moves away from the main positioning assembly, the second inflation assembly drives the limit assembly to leave the port position of the pipe fitting. The second inflation assembly includes a second air cylinder (1401) installed on the pressure plate (1001), a second air delivery pipe (1402) with one end connected to the second air cylinder (1401), and a third air cylinder (1403) connected to the other end of the second air delivery pipe (1402). The third air cylinder (1403) is installed inside the shaft seat (803). Gas flows between the second air cylinder (1401) and the third air cylinder (1403) through the second air delivery pipe (1402). The limit assembly includes a clamping plate (1603) movably connected inside the shaft seat (803), a second plunger (1601) fixedly installed on the clamping plate (1603), and a second return spring (1602) with one end connected to the second plunger (1601). The second plunger (1601) is movably connected inside the third air cylinder (1403), and the other end of the second return spring (1602) is connected to the third air cylinder (1403). When gas flows from the second air cylinder (1401) into the third air cylinder (1403), the clamping plate (1603) extends from the shaft seat (803) and abuts against the large head end (1501). When gas flows from the third air cylinder (1403) into the second air cylinder (1401), the clamping plate (1603) retracts into the shaft seat (803) and leaves the large head end (1501). The three - stage drive assembly includes a third motor (1701) installed in the second air cylinder (1401), a first screw rod (1702) connected to the output end of the third motor (1701), and a piston head (1703) threadedly connected to the first screw rod (1702). When the large - end (1501) of the pipe fitting approaches the pressing plate (1001) and moves to a preset position, the tension sensor (1003) detects that the tension value of the tension spring (1002) is F1 and sends a signal to the control unit of the third motor (1701). The third motor (1701) is used to drive the first screw rod (1702) to rotate. The first screw rod (1702) is used to drive the piston head (1703) to move on the first screw rod (1702). The piston head (1703) is used to drive gas to flow into or out of the second air cylinder (1401).

7. The surface spraying device for pipe fitting processing according to claim 6, wherein: A first inflation assembly is installed on the main positioning assembly. A secondary positioning assembly is movably connected to the main positioning assembly. An inner dust - cleaning assembly is arranged on the alignment assembly. Gas flows between the first inflation assembly and the inner dust - cleaning assembly; When the large - end (1501) of the pipe fitting approaches the secondary positioning assembly, the gas in the first inflation assembly flows into the inner dust - cleaning assembly; when the large - end (1501) of the pipe fitting moves away from the secondary positioning assembly, the gas in the inner dust - cleaning assembly flows into the first inflation assembly; A linkage assembly and a closing assembly are movably connected to the base assembly. The input end of the linkage assembly is connected to the output end of the first - stage drive assembly. The input end of the closing assembly is connected to the output end of the linkage assembly. The linkage assembly is used to drive the closing assembly to move; When the small - end (1502) of the pipe fitting rotates to the preset position M1, the linkage assembly drives the closing assembly to approach the small - end (1502) of the pipe fitting; when the small - end (1502) of the pipe fitting rotates to the preset position M2, the linkage assembly drives the closing assembly to move away from the small - end (1502) of the pipe fitting.

8. A surface spraying device for pipe fitting processing according to claim 7, characterized in that: The first inflation assembly includes a first air cylinder (1101) installed on the pressing plate (1001) and a first air supply pipe (1102) with one end connected to the first air cylinder (1101). The other end of the first air supply pipe (1102) is connected to the inner dust - cleaning assembly. Gas flows between the first air cylinder (1101) and the inner dust - cleaning assembly through the first air supply pipe (1102); The secondary positioning assembly includes a pressing piece (1201) movably connected to the pressing plate (1001), a first plunger (1202) fixedly connected to the pressing piece (1201), and a first return spring (1203) with one end connected to the first plunger (1202). The first plunger (1202) is movably connected inside the first air cylinder (1101). The other end of the first return spring (1203) is connected inside the first air cylinder (1101). When the first plunger (1202) moves inside the first air cylinder (1101), gas flows into or out of the first air cylinder (1101); The internal dust cleaning component includes a second air duct (1301) arranged in the shaft seat (803) and a second air hole (1302) opened on the surface of the shaft seat (803). The second air hole (1302) is communicated with the second air duct (1301), and the first air supply pipe (1102) is communicated with the second air duct (1301). Gas flows into or out of the second air duct (1301) through the second air hole (1302).

9. The surface spraying device for pipe fitting processing according to claim 8, wherein: The linkage component includes a toothed ring (1801), a first linkage gear (1802), and a third linkage gear (1804) movably connected to the guide frame (101), and a second linkage gear (1803) fixedly connected to the first linkage gear (1802). The toothed ring (1801) meshes with the first gear (502), the first linkage gear (1802) meshes with the toothed ring (1801), the third linkage gear (1804) meshes with the second linkage gear (1803). The first gear (502) is used to drive the toothed ring (1801) to rotate, the toothed ring (1801) is used to drive the first linkage gear (1802) and the second linkage gear (1803) to rotate, and the second linkage gear (1803) is used to drive the third linkage gear (1804) to rotate; The closing component includes a slide rod (1902) movably connected to the guide frame (101), a second screw rod (1901) fixedly connected to one end of the slide rod (1902), and a sealing plate (1903) fixedly connected to the other end of the slide rod (1902). The second screw rod (1901) is threadedly connected to the third linkage gear (1804), and the third linkage gear (1804) is used to drive the second screw rod (1901), the slide rod (1902), and the sealing plate (1903) to move; When the small head end (1502) of the pipe fitting rotates to the preset position M1, the sealing plate (1903) moves onto the small head end (1502); when the small head end (1502) of the pipe fitting rotates to the preset position M2, the sealing plate (1903) moves away from the small head end (1502) of the pipe fitting.

10. A surface spraying method for pipe fittings processing, characterized in that: Adopt a surface spraying device for pipe fitting processing as described in claim 9, including the following steps: S1: The user aligns the large head end (1501) of the pipe fitting horizontally with the end of the air needle (804), inserts it into the inside of the support ring (602), and sleeved on the air needle (804) along the axial direction of the air needle (804), and makes the large head end (1501) gradually approach the pressing plate (1001); S2: When the large head end (1501) abuts against the pressing piece (1201), the shaft seat (803) enters the large head end (1501). The pipe fitting first generates pressure on the pressing piece (1201), overcomes the elastic force of the first return spring (1203), makes the first plunger (1202) move in the first air cylinder (1101), and pushes the gas in the first air cylinder (1101) into the second air duct (1301) through the first air supply pipe (1102), and discharges it through the second air hole (1302) to blow the inside of the pipe fitting with wind, and blows out the dust remaining in the pipe fitting through the small head end (1502); S3: When the tablet (1201) is inserted onto the pressing plate (1001), the first plunger (1202) cannot move further. At this time, the pressing plate (1001) is subjected to the continuous pushing force of the pipe fitting during movement, overcoming the elastic force of the tension spring (1002), squeezing the air hood (901), causing the gas in the air hood (901) to flow into the air needle (804) through the air delivery pipe (902). The gas in the air needle (804) further flows into the airbag (805) and the plugging bladder (806). After the airbag (805) and the plugging bladder (806) expand, they tightly fit against the inner wall of the pipe fitting, locking the pipe fitting through friction. At the same time, the plugging bladder (806) seals the connection between the small head end (1502) and the pipe body of the pipe fitting; S4: When the pressing plate (1001) cannot move further when it abuts against the collar (802), at this time, the tension sensor (1003) detects that the tension value of the tension spring (1002) reaches F1 and sends a signal to the control unit of the third motor (1701); S5: When the third motor (1701) starts, it drives the first screw rod (1702) to rotate. The rotating first screw rod (1702) drives the piston head (1703) to move within the second air cylinder (1401), pushing the gas in the second air cylinder (1401) into the third air cylinder (1403) through the second air delivery pipe (1402). The air pressure in the third air cylinder (1403) increases, overcoming the elastic force of the second return spring (1602), pushing the second plunger (1601) to move. The second plunger (1601) drives the clamping plate (1603) to protrude from the shaft seat (803) and abut against the side wall of the large head end (1501) to limit the pipe fitting; S6: Drive the nozzle (301) to be in place through the longitudinal moving machine (202) and the transverse moving machine (204). First, open the electric valve (404) to connect the air duct (303) and the first air duct (403). The transverse moving machine (204) drives the nozzle (301) to move from the small head end (1502) to the large head end (1501). At the same time, an external air pumping device flows into the air ring (401) through the pump pipe (302), the air duct (303) and the first air duct (403), and finally discharges from the first air hole (402) to blow the surface of the pipe fitting. At the same time, the second motor (701) drives the second gear (702) to rotate. Through the meshing transmission of the second gear (702) and the gear ring (801), it drives the gear ring (801) and the air needle (804) to rotate, and drives the pipe fitting to rotate by using the friction between the airbag (805) and the inner wall of the pipe fitting to clean the surface of the pipe fitting; S7: When the nozzle (301) moves to the large head end (1501), an external feeding device inputs particulate material into the air duct (303) through the material pipe (304). Meanwhile, the electric valve (404) closes, and the high-speed gas flowing into the air duct (303) drives the particulate material to be ejected onto the pipe fitting for spraying. Moreover, driven by the lateral moving machine (204), the nozzle (301) slowly moves towards the small head end (1502) side, and sprays the arc-shaped outer wall and the inner corner of the large head end (1501), the pipe body, and the small head end (1502) successively; S8: When the nozzle (301) moves to the small head end (1502), the sensor (206) detects that the stress value of the signal spring (205) reaches F2 and sends a signal to the control unit of the first motor (501); S9: The first motor (501) drives the first gear (502) to rotate. Through the support rod (601) and the connecting frame (603), it drives the support ring (602) and the fixed ring (604) to move along the arc direction of the track groove (102), so that the small head end (1502) rotates from the M2 position to the M1 position. Meanwhile, the first gear (502) transmits the power to the gear ring (1801), and then the gear ring (1801) transmits it to the first linkage gear (1802). Through the meshing transmission of the second linkage gear (1803) and the third linkage gear (1804), and the threaded transmission of the third linkage gear (1804) and the second screw rod (1901), the second screw rod (1901) is driven to move, making the sealing plate (1903) approach the small head end (1502) until it covers the open end of the small head end (1502) to form a seal; S10: The nozzle (301) then sprays the flat outer wall and the inner corner of the small head end (1502). Combining with step S7, a secondary spraying area is formed at the inner corner.

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