Anti-rust paint spraying device for steel structure surface

Abstract

The present invention provides an anti-rust paint spraying device for steel structure surface, and relates to the field of anti-rust treatment of steel structure. The anti-rust paint spraying device for steel structure surface comprises a paint spray gun body, a paint spray head is fixedly installed at the left end of the paint spray gun body, and a channel A, a channel B, a channel C, a channel D and a feeding area are opened inside the paint spray gun body, and both channels A and C are connected to channel B, and the two ends of the feeding area are connected to channel C and channel D respectively. The anti-rust paint spraying device for steel structure surface can make the inside of the paint spray gun body in a constant pressure state, and when the air pressure inside channel D increases, piston A can move left, increase the air pressure between piston A and the convex block, and make piston B descend, after spraying, piston B can reset, so that channel D and the inside of the paint spray head are in a negative pressure state, so that the residual anti-rust paint at the paint spray head can be sucked into channel D, and the anti-rust paint is prevented from dripping onto the surface of the steel structure and the ground.

Description

Technical Field

[0001] The invention relates to the field of anti-rust treatment of steel structures, in particular to an anti-rust paint spraying device for the surface of a steel structure. Background Art

[0002] When performing surface treatment on steel structures, the rusted areas must be removed first to prevent further corrosion. Surface treatment methods include sandblasting, electrolytic polishing, mechanical polishing, etc. This method can effectively remove surface rust and improve the surface quality of steel structures, but it cannot effectively prevent rust for a long time. By spraying anti-rust paint on the surface of steel structures, a protective layer can be formed, which is an effective method for rust prevention of steel structures. Adding special chemicals to the coating can increase the corrosion resistance of the coating and protect the steel structure from rust for a long time.

[0003] At the end of spraying, the existing spray device will have some residual anti-rust paint at the nozzle position of the spray device due to improper pressure adjustment and a certain viscosity of the anti-rust paint. After spraying, the anti-rust paint at the nozzle is easy to drip from the nozzle to the ground and the surface of the steel structure. When dripping on the surface of the steel structure, and because the source of the pressure is non-constant air pressure, the non-constant air pressure can cause the spraying amount to change, which will reduce the uniformity of the spraying surface and reduce the spraying quality of the workpiece. When the paint at the nozzle drips onto the ground, it will cause inconvenience to the subsequent cleaning. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides an anti-rust paint spraying device for the surface of a steel structure, which solves the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an anti-rust paint spraying device for the surface of a steel structure, comprising a paint spray gun body, a paint spray head is fixedly installed on the left end of the paint spray gun body, a channel A, a channel B, a channel C, a channel D and a feeding area are opened inside the paint spray gun body, channel A and channel C are both connected to channel B, and the two ends of the feeding area are respectively connected to channel C and channel D, the bottom end of the paint spray gun body is used to connect to an external air compressor, and high-pressure gas can be delivered to channel A through the air compressor, and a control mechanism and an adjustment mechanism are installed inside the paint spray gun body, the control mechanism can control the on and off of the gas inside channel B, and the adjustment mechanism can adjust the air pressure inside channel B.

[0006] A feed port is provided on the outer surface of the paint spray gun body, and a feed mechanism is fixedly connected to the upper end of the feed port. The feed mechanism is used to inject anti-rust paint into the feed area through the feed port. A conveying mechanism is installed inside the feed area. The conveying mechanism can convey the anti-rust paint inside the feed area to the channel D. A turbine is installed at the right end of the conveying mechanism. When the gas inside the channel C enters the feed area, the turbine can rotate.

[0007] The left end of the paint spray gun body is fixedly connected with pipe A and pipe B. Both pipe A and pipe B are U-shaped and both ends are connected with channel D. A protrusion is fixedly connected to the inner wall of channel D. A spring A is fixedly connected to the right side of the protrusion. A piston A is fixedly connected to the right end of spring A. Piston A can move back and forth in a straight line along channel D. A fixing ring is fixedly connected to the inner wall of pipe B. A spring B is fixedly connected to the upper surface of the fixing ring. Piston B is fixedly connected to the upper end of spring B. Piston B can move back and forth in a straight line along the inner wall of pipe B. When piston A drives spring A to compress, the air pressure inside pipe B increases, which can cause piston B to descend. After painting is completed, piston B can rise and make the left end of channel D in a negative pressure state.

[0008] Preferably, the longitudinal section of the feeding zone is circular, and both ends of the feeding zone are conical.

[0009] Preferably, a one-way valve A is installed inside the channel C, and the opening direction of the one-way valve A is set to upward.

[0010] Preferably, the anti-rust paint inside the channel D can enter the paint spray head, and the friction between the anti-rust paint and the air at the paint spray head can destroy the anti-rust paint flakes, causing them to first become fragments and finally become droplets, and begin to atomize.

[0011] Preferably, a one-way valve B is fixedly installed on the inner wall of the pipeline A, and the opening direction of the one-way valve B is upward.

[0012] Preferably, the adjustment mechanism consists of a handle and an adjustment cylinder, the handle is rotatably connected to the paint spray gun body, both ends of the adjustment cylinder are sealed, the adjustment cylinder is fixedly connected to the handle, an air inlet is provided at the bottom of the adjustment cylinder, and an exhaust port is provided at the top of the adjustment cylinder. The size of the exhaust port is larger than the size of the air inlet, and the exhaust port is always connected to channel C when rotating, and the air inlet is connected to channel A.

[0013] Preferably, the control mechanism consists of a handle, a push rod, a sealing plug and a fixed disk. The handle is hinged to the paint gun body, the push rod is hinged to the handle, the push rod is slidably connected to the paint gun body and can reciprocate linearly along the paint gun body, the right end of the push rod is slidably connected to the left side surface of the adjusting cylinder and is fixedly connected to the sealing plug, the sealing plug can block the air inlet and can move along the inner wall of the adjusting cylinder, the fixed disk is fixedly connected to the push rod, and starts to accumulate force when the fixed disk is forced to move to the right, and can reset when no force is applied.

[0014] Preferably, the conveying mechanism consists of a rotating rod, two crosses, two spiral blades and three stirring blades. The two crosses are fixedly connected to the inner wall of the feeding area, and the two ends of the rotating rod respectively pass through the two crosses and are respectively rotatably connected to the two crosses. The right end of the rotating rod is fixedly connected to the turbine, and the left end is fixedly connected to the three stirring blades.

[0015] Preferably, the feeding mechanism consists of a feeding barrel, a supporting frame, a ball and a stirring rod, the bottom end of the feeding barrel is fixedly connected to the paint spray gun body, the upper end of the feeding barrel is used to connect with an external paint tube, and the anti-rust paint is injected into the feeding barrel through a plunger pump and a paint tube, the supporting frame is fixedly connected to the bottom end of the feeding barrel, the ball is located inside the supporting frame and is rotatably connected to the supporting frame, the stirring rod passes through the ball and is slidably connected to the ball, the bottom end of the stirring rod is spherical, the outer surface of the stirring rod is fixedly connected with a connecting plate, a spring C is fixedly connected between the connecting plate and the supporting frame, the spring C is in a static state, and the spiral blade can collide with the bottom end of the stirring rod when rotating, and cause the stirring rod to swing under force.

[0016] Preferably, the feed port is in a cone shape, and its two ends are respectively connected to the feed area and the feed barrel.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the anti-rust paint spraying device for the surface of a steel structure, high-pressure gas can pass through channel A, channel B, channel C, a feeding area and channel D in sequence. When the high-pressure gas passes through the turbine, the turbine, the spiral blades and the stirring blades can be linked. The greater the gas flow rate, the faster the turbine speed, and thus the greater the discharge amount of the anti-rust paint. Moreover, when the spiral blades rotate, they can not only transport the anti-rust paint to the left, but also collide with the bottom end of the stirring rod and make the stirring rod swing under force, which can not only prevent blockage, but also stir the anti-rust paint and improve the spraying quality. By arranging pistons A and B, not only can the interior of the paint spray gun body be in a constant pressure state, but also when the air pressure in the channel D increases, the piston A can move to the left, increase the air pressure between the piston A and the bump, and make the piston B drop. After the spraying is completed, the piston B can be reset, so that the channel D and the interior of the paint spray head are in a negative pressure state, so that the residual anti-rust paint at the paint spray head can be drawn into the channel D to prevent the anti-rust paint from dripping onto the surface of the steel structure and the ground, thereby solving the problem raised in the background technology.

[0019] The anti-rust paint spraying device for the surface of a steel structure can disengage the sealing plug from the air inlet by pressing the handle, thereby facilitating the supply of high-pressure gas and achieving the purpose of spraying paint; loosening the handle can reset the sealing plug and thereby block the air inlet and achieve the purpose of stopping the spraying paint; the regulating cylinder can be rotated by rotating the handle, thereby changing the gas flow rate between the air inlet and the channel A, thereby adjusting the air pressure, and thus adjusting the discharge amount of the sprayed anti-rust paint. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the paint spray gun body of the present invention;

[0021] Figure 2 It is a cross-sectional view of the front view of the paint spray gun body of the present invention;

[0022] Figure 3 For the present invention Figure 2 A schematic diagram of the structure enlargement in the middle;

[0023] Figure 4 It is a schematic diagram of the structure of the conveying mechanism of the present invention;

[0024] Figure 5 It is a partial structural schematic diagram of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the regulating cylinder of the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the bump and the piston A of the present invention;

[0027] Figure 8 This is a schematic diagram of the guide blade structure of the present invention;

[0028] Fig. 9 It is a schematic diagram of the structure of the connecting piece of the present invention.

[0029] Among them: 1-paint gun body; 2-paint head; 3-channel A; 4-channel B; 5-channel C; 6-channel D; 7-feeding area; 8-control mechanism; 801-handle; 802-push rod; 803-sealing plug; 804-fixing plate; 9-adjusting mechanism; 901-handle; 902-adjusting cylinder; 10-feeding port; 11-feeding mechanism; 111-feeding barrel; 112-support frame; 113-round bead; 114-stirring rod; 12-conveying mechanism; 121-rotating rod; 122-cross; 123-spiral blade; 124-stirring blade; 13-turbine; 14-pipeline A; 15-pipeline B; 16-bump; 17-piston A; 18-guide blade; 19-piston B; 20-inlet; 21-exhaust port; 22-connecting plate; 23-adjusting plate; 24-rotating shaft; 25-connecting piece. DETAILED DESCRIPTION

[0030] Embodiment 1: Figure 1-7As shown, an anti-rust paint spraying device for the surface of a steel structure comprises a paint spray gun body 1, a paint spray head 2 is fixedly installed at the left end of the paint spray gun body 1, a channel A3, a channel B4, a channel C5, a channel D6 and a feeding area 7 are opened inside the paint spray gun body 1, a one-way valve A is installed inside the channel C5, and the opening direction of the one-way valve A is set to upward, the longitudinal section of the feeding area 7 is circular, and both ends of the feeding area 7 are conical, which can increase the pressure difference between the feeding area 7 and the channel D6, and can make the anti-rust paint inside the feeding area 7 not easy to enter the channel C5, and the anti-rust paint inside the channel D6 can enter the paint spray head 2, and the friction between the anti-rust paint and the air at the paint spray head 2 can destroy The flakes of anti-rust paint are first broken into fragments and finally into droplets, and begin to atomize. Channel A3 and channel C5 are both connected to channel B4. The two ends of the feeding area 7 are respectively connected to channel C5 and channel D6. The bottom end of the paint spray gun body 1 is used to connect to an external air compressor, and the high-pressure gas can be delivered to channel A3 through the air compressor. A control mechanism 8 and an adjustment mechanism 9 are installed inside the paint spray gun body 1. The control mechanism 8 consists of a handle 801, a push rod 802, a sealing plug 803 and a fixed plate 804. The handle 801 is hinged to the paint spray gun body 1, and the push rod 802 is hinged to the handle 801. The push rod 802 is slidably connected to the paint spray gun body 1 and can reciprocate in a straight line along the paint spray gun body 1. The right end of the push rod 802 is slidably connected to the left side of the regulating cylinder 902 and is fixedly connected to the sealing plug 803. The sealing plug 803 can block the air inlet 20 and can move along the inner wall of the regulating cylinder 902. The fixed disk 804 is fixedly connected to the push rod 802. When the fixed disk 804 is forced to move to the right, it begins to accumulate force and can be reset when no force is applied. Pressing the handle 801 can disengage the sealing plug 803 from the air inlet 20, which is convenient for supplying high-pressure gas to achieve the purpose of painting. Loosening the handle 801 can reset the sealing plug 803, thereby blocking the air inlet 20 to stop painting. The control mechanism 8 can control the on-off of the gas inside the channel B4. The regulating mechanism 9 can adjust the air pressure inside the channel B4. The regulating mechanism 9 consists of a handle 901 and an adjusting cylinder 902. The handle 901 is rotatably connected to the paint spray gun body 1. Both ends of the adjusting cylinder 902 are sealed. The adjusting cylinder 902 is fixedly connected to the handle 901. An air inlet 20 is provided at the bottom of the adjusting cylinder 902. An exhaust port 21 is provided at the upper part of the adjusting cylinder 902. The size of the exhaust port 21 is larger than the size of the air inlet 20. When the exhaust port 21 rotates, it is always connected with the channel C5. The air inlet 20 is connected with the channel A3. By rotating the handle 901, the adjusting cylinder 902 can be rotated, thereby changing the gas flow between the air inlet 20 and the channel A3, and thus the air pressure can be adjusted.

[0031] The outer surface of the paint spray gun body 1 is provided with a feed port 10, which is in a cone shape, and its two ends are respectively connected to the feed area 7 and the feed barrel 111, which can increase the pressure difference between the upper end and the bottom end of the feed port 10, which is conducive to the falling of the anti-rust paint. The upper end of the feed port 10 is fixedly connected with a feed mechanism 11, and the feed mechanism 11 is composed of a feed barrel 111, a support frame 112, a ball 113 and a stirring rod 114. The bottom end of the feed barrel 111 is fixedly connected to the paint spray gun body 1, and the upper end of the feed barrel 111 is used to connect with the paint pipe outside, and through the plunger pump and the paint pipe, the paint is poured into the paint spray gun body 1. The anti-rust paint is injected into the feed barrel 111, the support frame 112 is fixedly connected to the bottom end of the feed barrel 111, the ball 113 is located inside the support frame 112 and is rotatably connected to the support frame 112, the stirring rod 114 passes through the ball 113 and is slidably connected to the ball 113, the bottom end of the stirring rod 114 is spherical, the outer surface of the stirring rod 114 is fixedly connected with a connecting piece, and a spring C is fixedly connected between the connecting piece and the support frame 112, and the spring C is in a static state. When the spiral blade 123 rotates, it can collide with the bottom end of the stirring rod 114, and the stirring rod 114 is subjected to force to generate The feed mechanism 11 is used to inject the anti-rust paint into the feed area 7 through the feed port 10. The feed area 7 is provided with a conveying mechanism 12. The conveying mechanism 12 is composed of a rotating rod 121, two crosses 122, two spiral blades 123 and three stirring blades 124. The two crosses 122 are fixedly connected to the inner wall of the feed area 7. The two ends of the rotating rod 121 respectively penetrate the two crosses 122 and are rotatably connected to the two crosses 122 respectively. The right end of the rotating rod 121 is fixedly connected to the turbine 13. The left end of the conveying mechanism 12 is fixedly connected to the three stirring blades 124. When the turbine 13 rotates, it can drive the rotating rod 121 to rotate, thereby rotating the spiral blade 123 and the three stirring blades 124. The spiral blade 123 can transport the anti-rust paint in the direction of the channel D6. The three stirring blades 124 can evenly stir the anti-rust paint to improve the spraying effect. The conveying mechanism 12 can transport the anti-rust paint in the feeding area 7 to the channel D6. The right end of the conveying mechanism 12 is equipped with a turbine 13. When the gas in the channel C5 enters the feeding area 7, the turbine 13 can rotate.

[0032] The left end of the paint spray gun body 1 is fixedly connected with a pipe A14 and a pipe B15, both of which are U-shaped and are connected to the channel D6 at both ends. A one-way valve B is fixedly installed on the inner wall of the pipe A14, and the opening direction of the one-way valve B is upward. The anti-rust paint inside the feeding area 7 can enter the right end of the channel D6, and then enter the pipe A14, and open the one-way valve B to transport the anti-rust paint to the left end of the channel D6. The inner wall of the channel D6 is fixedly connected with a protrusion 16, and the right side of the protrusion 16 is fixedly connected with a spring A, and the right end of the spring A is fixedly connected There is a piston A17, and the spring A is in a static state. The piston A17 can move back and forth in a straight line along the channel D6. A fixing ring is fixedly connected to the inner wall of the pipe B15, and a spring B is fixedly connected to the upper surface of the fixing ring. The upper end of the spring B is fixedly connected to the piston B19. The spring B is in a static state, and the piston B19 can move back and forth in a straight line along the inner wall of the pipe B15. When the piston A17 drives the spring A to be compressed, the air pressure inside the pipe B15 increases, which can make the piston B19 descend. After the painting is completed, the piston B19 can rise and make the left end of the channel D6 in a negative pressure state.

[0033] When using, Figure 1-7 As shown, first, the anti-rust paint is injected into the feed barrel 111 through the plunger pump and the paint pipe, and the anti-rust paint in the feed barrel 111 enters the feed port 10 and then enters the feed area 7. Then, the bottom end of the paint spray gun body 1 is used to connect with the external air compressor, and the high-pressure gas can be delivered to the channel A3 through the air compressor. The handle 801 is pressed to drive the push rod 802 to move right, and the push rod 802 drives the sealing plug 803 to move right, so that the sealing plug 803 is separated from the air inlet 20, and the gas in the channel A3 enters the regulating cylinder 902 through the air inlet 20, and the gas in the regulating cylinder 902 enters the channel C5 from the exhaust port 21, and the one-way valve A in the channel C5 is opened to allow the gas to enter the feed area 7. When the gas enters the feed area 7, it can drive the turbine 13 to rotate, and the turbine 13 drives the rotating rod 121 to rotate, and the rotating rod 1 21 can drive the spiral blade 123 to rotate, and with a high air pressure to transport the anti-rust paint into the channel D6, when the spiral blade 123 rotates, it can not only transport the anti-rust paint to the left, but also collide with the bottom end of the stirring rod 114, causing the stirring rod 114 to deviate, the connecting piece and the spring C can provide a reset force for the stirring rod 114, so that the spiral blade 123 can drive the stirring rod 114 to swing during the rotation process, and the stirring rod 114 can swing with the ball 113 as the axis, the bottom end of the stirring rod 114 can stir the inside of the feed port 10, and the upper end of the stirring rod 114 can stir the inside of the feed barrel 111, which can not only prevent blockage, but also stir the anti-rust paint, and the rotating rod 121 can drive the three stirring blades 124 to rotate when rotating, and further stir, so that the anti-rust paint is more uniform and the spraying quality is improved.

[0034] When the pressure at the right end of channel D6 increases, piston A17 can be forced to move leftward. When piston A17 moves leftward, the air pressure between piston A17 and bump 16 can be increased, thereby increasing the air pressure in pipe B15 and pushing piston B19 down. At this time, spring A connected to piston A17 begins to compress and accumulate force, and spring B connected to piston B19 begins to compress and accumulate force. Since the air pressure delivered by the air compressor is non-constant, when the pressure on the right side of channel D6 decreases, piston A17 can move to the right to compensate for the lost pressure. When the pressure on the right side of channel D6 increases, When the air pressure delivered by the air compressor is non-constant, the air pressure inside the paint spray gun body 1 can be kept constant, so that the paint spraying is more uniform. The anti-rust paint at the right end of the channel D6 enters the pipe A14, and then opens the one-way valve B, and then enters the left end of the channel D6. The friction between the anti-rust paint and the air at the paint spray head 2 can destroy the anti-rust paint flakes, causing it to first become fragments and finally become droplets, and begin to atomize, and finally be sprayed out from the paint spray head 2 to spray the anti-rust paint on the surface of the steel structure.

[0035] When it is necessary to adjust the amount of paint sprayed, first turn the handle 901, which drives the adjusting cylinder 902 to rotate, and the air inlet 20 at the bottom of the adjusting cylinder 902 and the upper end of the channel A3 begin to move relative to each other and begin to move in a staggered direction, so that the contact surface between the air inlet 20 and the channel A3 is reduced, thereby reducing the air intake volume, and then reducing the air pressure supply inside the paint spray gun body 1. When the air pressure is reduced, the paint discharge volume will also be reduced, thereby achieving the purpose of changing the paint discharge volume.

[0036] After the painting work is completed, the handle is released, the sealing plug 803 is reset, and the air inlet 20 is blocked, the air supply to channel A3 stops, the pressure on piston A17 is reduced, and it begins to reset. When piston A17 resets, it moves to the right and increases the air pressure between piston A17 and bump 16, thereby increasing the air pressure inside pipe B15, piston B19 rises, and the bottom end of pipe B15 and the left end of channel D6 are in a negative pressure state, so that the anti-rust paint remaining at the paint spray head 2 is drawn into pipe D to prevent the paint spray head 2 from dripping.

[0037] Embodiment 2: Figure 2 , Figure 8 and Fig. 9As shown, a connecting disk 22 is installed on the outer surface of the turbine 13. The position of the connecting disk 22 is fixed and fixedly connected to the inner wall of the feeding area 7. An adjusting disk 23 is rotatably connected to one side of the connecting disk 22. The inside of the connecting disk 22 is rotatably connected to a plurality of rotating shafts 24 arranged in a circle. One end of each rotating shaft 24 is fixedly connected to a connecting piece 25, and the other end is fixedly connected to a guide blade 18. Every two guide blades 18 are in close contact with each other, and every two guide blades 18 are sealed. The plurality of guide blades 18 can be surrounded to form a sealed ring. Each guide blade 18 is clamped with the adjusting disk 23. The adjusting disk 23 is connected to a controller, and the adjusting disk 23 can be controlled to rotate by the controller. When the adjusting disk 23 rotates, the plurality of connecting pieces 25 can be driven to rotate. When the air pressure inside the paint spray gun body 1 is low, the controller can adjust the rotation of the disk 23 and open the plurality of guide blades 18 at a small angle. When the air pressure inside the paint spray gun body 1 is high, the opening angle of the plurality of guide blades 18 can be increased.

[0038] When using, Figure 2 , Figure 8 and Fig. 9 As shown, when the gas enters the feed zone 7 from the channel C5, the turbine 13 can rotate, and the guide vanes 18 are opened at a small angle when the turbine 13 runs at a low speed. Because the channel is small, a small amount of gas can also be swept onto the blades of the turbine 13 at a high flow rate, and the turbine 13 can also run at a high speed to increase the intake volume, which can effectively solve the problem of unstable air pressure caused by the hysteresis of the turbine 13, which is equivalent to using a small turbine 13. When the turbine 13 rotates at a high speed, the adjustment disk 23 is rotated by the controller, and the adjustment disk 23 drives the multiple connecting parts 25 to rotate, and the multiple connecting parts 25 respectively drive the multiple rotating shafts 24 to rotate, and the multiple rotating shafts 24 respectively drive the multiple guide vanes 18 to rotate. By changing the angle of the blades, not only can the channel of the airflow at the turbine 13 be enlarged and the exhaust resistance be reduced, but the rotation speed of the turbine 13 can also be slowed down, which is equivalent to using a large turbine 13, so that the air pressure inside the paint spray gun body 1 can be kept constant, and the paint spraying can be more uniform.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for spraying anti-rust paint on the surface of a steel structure, comprising a spray gun body (1), characterized in that: A paint spray head (2) is fixedly mounted on the left end of the paint spray gun body (1); a channel A (3), a channel B (4), a channel C (5), a channel D (6) and a feed area (7) are provided inside the paint spray gun body (1); channel A (3) and channel C (5) are both connected to channel B (4); two ends of the feed area (7) are respectively connected to channel C (5) and channel D (6); the bottom end of the paint spray gun body (1) is used to connect to an external air compressor, and the air compressor can deliver high-pressure gas to channel A (3); a control mechanism (8) and an adjustment mechanism (9) are installed inside the paint spray gun body (1); the control mechanism (8) can control the on and off of the gas inside channel B (4); and the adjustment mechanism (9) can adjust the air pressure inside channel B (4); The outer surface of the paint spray gun body (1) is provided with a feed port (10), and the upper end of the feed port (10) is fixedly connected to a feed mechanism (11), and the feed mechanism (11) is used to inject the anti-rust paint into the feed area (7) through the feed port (10). A conveying mechanism (12) is installed inside the feed area (7), and the conveying mechanism (12) can convey the anti-rust paint inside the feed area (7) to the channel D (6). A turbine (13) is installed at the right end of the conveying mechanism (12), and when the gas inside the channel C (5) enters the feed area (7), the turbine (13) can rotate; The left end of the paint spray gun body (1) is fixedly connected to a pipe A (14) and a pipe B (15). Both the pipe A (14) and the pipe B (15) are U-shaped and both ends are connected to the channel D (6). The inner wall of the channel D (6) is fixedly connected to a protrusion (16). The right side of the protrusion (16) is fixedly connected to a spring A. The right end of the spring A is fixedly connected to a piston A (17). The piston A (17) can move back and forth along the channel D (6). The inner wall of the pipe B (15) is fixedly connected to a fixing ring. The upper surface of the fixing ring is fixedly connected to a spring B. The upper end of the spring B is fixedly connected to a piston B (19). The piston B (19) can move back and forth along the inner wall of the pipe B (15). When the piston A (17) drives the spring A to compress, the internal air pressure of the pipe B (15) increases, which can cause the piston B (19) to descend. After the painting is completed, the piston B (19) can rise and make the left end of the channel D (6) in a negative pressure state.

2. The anti-rust paint spraying device for the surface of a steel structure according to claim 1, characterized in that: The longitudinal section of the feeding zone (7) is circular, and both ends of the feeding zone (7) are conical.

3. The anti-rust paint spraying device for the surface of a steel structure according to claim 1, characterized in that: A one-way valve A is installed inside the channel C (5), and the opening direction of the one-way valve A is set to be upward.

4. The anti-rust paint spraying device for the surface of a steel structure according to claim 1, characterized in that: The anti-rust paint inside the channel D (6) can enter the paint spray head (2), and the friction between the anti-rust paint and the air at the paint spray head (2) can destroy the anti-rust paint flakes, causing them to first become fragments and finally become droplets, and begin to atomize.

5. The anti-rust paint spraying device for the surface of a steel structure according to claim 1, characterized in that: A one-way valve B is fixedly installed on the inner wall of the pipeline A (14), and the opening direction of the one-way valve B is upward.

6. The anti-rust paint spraying device for the surface of a steel structure according to claim 1, characterized in that: The adjustment mechanism (9) is composed of a handle (901) and an adjustment cylinder (902); the handle (901) is rotatably connected to the paint spray gun body (1); both ends of the adjustment cylinder (902) are sealed; the adjustment cylinder (902) and the handle (901) are fixedly connected; an air inlet (20) is provided at the bottom of the adjustment cylinder (902); an exhaust port (21) is provided at the top of the adjustment cylinder (902); the size of the exhaust port (21) is larger than the size of the air inlet (20); the exhaust port (21) is always connected to the channel C (5) when rotating; and the air inlet (20) is connected to the channel A (3).

7. The anti-rust paint spraying device for the surface of a steel structure according to claim 1, characterized in that: The control mechanism (8) is composed of a handle (801), a push rod (802), a sealing plug (803) and a fixed disk (804); the handle (801) is hinged to the paint spray gun body (1); the push rod (802) is hinged to the handle (801); the push rod (802) is slidably connected to the paint spray gun body (1) and can reciprocate linearly along the paint spray gun body (1); the right end of the push rod (802) is slidably connected to the left side of the adjustment tube (902) and is fixedly connected to the sealing plug (803); the sealing plug (803) can block the air inlet (20) and can move along the inner wall of the adjustment tube (902); the fixed disk (804) is fixedly connected to the push rod (802); the fixed disk (804) starts to accumulate force when it is forced to move rightward and can reset when it is not forced.

8. The anti-rust paint spraying device for the surface of a steel structure according to claim 1, characterized in that: The conveying mechanism (12) is composed of a rotating rod (121), two crosses (122), two spiral blades (123) and three stirring blades (124); the two crosses (122) are fixedly connected to the inner wall of the feeding area (7); the two ends of the rotating rod (121) respectively penetrate the two crosses (122) and are respectively rotatably connected to the two crosses (122); the right end of the rotating rod (121) is fixedly connected to the turbine (13), and the left end is fixedly connected to the three stirring blades (124).

9. The anti-rust paint spraying device for the surface of a steel structure according to claim 1, characterized in that: The feeding mechanism (11) is composed of a feeding barrel (111), a support frame (112), a ball (113) and a stirring rod (114); the bottom end of the feeding barrel (111) is fixedly connected to the paint spray gun body (1); the top end of the feeding barrel (111) is used to connect to an external paint pipe, and the anti-rust paint is injected into the feeding barrel (111) through a plunger pump and a paint pipe; the support frame (112) is fixedly connected to the bottom end of the feeding barrel (111); the ball (113) is located on the support frame (112). The stirring rod (114) penetrates the ball (113) and is slidably connected to the ball (113). The bottom end of the stirring rod (114) is spherical. A connecting piece is fixedly connected to the outer surface of the stirring rod (114). A spring C is fixedly connected between the connecting piece and the supporting frame (112). The spring C is in a static state. When the spiral blade (123) rotates, it can collide with the bottom end of the stirring rod (114) and cause the stirring rod (114) to swing under force.

10. The anti-rust paint spraying device for the surface of a steel structure according to claim 1, characterized in that: The feed port (10) is in a cone shape, and its two ends are respectively connected to the feed area (7) and the feed barrel (111).

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