A gravity-type manual spray gun

Abstract

The application relates to the technical field of manual spray guns, and discloses a gravity type manual spray gun, a nozzle is arranged at the left end of the gun body, a joint is arranged at the bottom end of the gun body, the gun body is connected with the air outlet end of an external air compressor through an air pipe, an air passage and a pressure regulating cavity are arranged in the gun body, the air passage is in an L shape, and a feeding pipe is fixedly connected to the outer surface of the gun body. The gravity type manual spray gun can prevent paint from blocking the filter cartridge, can continuously keep the paint spraying path unblocked, can avoid the situation that air is discharged but paint is not sprayed, can automatically dredge by pulling the trigger without disassembling the filter cartridge, can make high-pressure gas flow through the air passage by pulling the trigger, can realize the spraying purpose, can increase the air pressure in the filter cartridge, can facilitate feeding, can avoid material backflow, and can control the spraying pressure by controlling the pressure regulating plug or the trigger, can make the two scraping brushes reverse, and can prevent the filter cartridge from being blocked.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of manual spray guns, in particular to a gravity type manual spray gun. BACKGROUND

[0002] The manual spray gun is a kind of spraying tool that needs to be operated by hand, and the manual spray gun needs to be connected with the air source when used, which is generally provided by the air compressor to ensure the stability of spraying, and then connected with the paint, the paint supply mode of the manual spray gun is divided into gravity type, pressure type and suction type, and the suction type and gravity type only need to pour paint into the spray pot of the spray gun.

[0003] The filter cartridge inside the gravity type manual spray gun is generally installed at the connection between the paint tank and the spray gun, and during use, the coating will accumulate at the filter cartridge, causing blockage, resulting in poor paint spraying path, and the problem of air out without paint spraying may occur, and when the blockage occurs, the filter cartridge needs to be disassembled and dredged, and when the blockage is serious, the filter cartridge needs to be replaced, which is troublesome. SUMMARY

[0004] The purpose of the present application is to provide a gravity type manual spray gun, which solves the problem of air out without paint spraying caused by easy blockage of the filter cartridge and poor paint spraying path.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a gravity type manual spray gun, comprising a gun body, a nozzle is installed at the left end of the gun body, a connector is installed at the bottom end of the gun body, the gun body is connected with the air outlet end of an external air compressor through a gas pipe, an air passage and a pressure regulating cavity are formed in the gun body, the air passage is L-shaped, a feed pipe is fixedly connected to the outer surface of the gun body, a first cavity and a second cavity are formed in the feed pipe, the bottom end of the first cavity is conical, the first cavity and the second cavity are connected, the second cavity is connected with the gun body, a sealing cover is placed on the upper surface of the feed pipe, a filter cartridge is fixedly connected to the bottom surface of the sealing cover, the filter cartridge is cylindrical, a filter plate is placed on the bottom surface of the filter cartridge, the filter plate is disc-shaped, a fixed cylinder penetrating upward and downward is fixedly embedded in the filter plate, and the fixed cylinder penetrates the gun body.

[0006] Two symmetrical scraping brushes are placed on the inner wall of the filter cartridge, the side surface of each scraping brush close to the inner wall of the filter cartridge is arc-shaped, three equidistantly arranged fixed rods are fixedly connected to the side surface of each scraping brush close to each other, a sleeve is sleeved with one end of each fixed rod close to the fixed cylinder, each sleeve is fixedly connected with the fixed cylinder, a spring is fixedly connected between each fixed rod and the fixed cylinder, each spring is in a compressed state, a first one-way valve is installed at the upper end of the fixed cylinder, a paint tank is placed above the gun body, the bottom end of the paint tank is rotatably connected with the sealing cover through a sealing bearing, a threaded groove is formed on the outer surface of the upper end of the feed pipe, a threaded cylinder is fixedly connected to the bottom end of the paint tank, and the threaded cylinder is screwedly connected with the threaded groove.

[0007] The interior of the gun body is fixedly embedded with a first air pipe and a second air pipe, one end of the first air pipe is communicated with the air channel, the other end of the first air pipe is rotatably connected with the bottom end of the fixed cylinder through a sealed bearing, the inner walls of the first air pipe and the air channel are respectively provided with a second one-way valve and two symmetrical third one-way valves, the third one-way valve located at the rightmost side is close to the nozzle, the right end of the second air pipe is communicated with the bottom end of the pressure regulating cavity, the left end of the second air pipe is fixedly communicated with a pressure reducing pipe, the two ends of the pressure reducing pipe are in a sealed state, the outer surface of the pressure reducing pipe is fixedly communicated with a third air pipe, the inner diameter of the pressure reducing pipe is larger than the inner diameter of the third air pipe, the inner wall of the third air pipe is slidably connected with a second piston, the right side surface of the second piston is fixedly connected with a push rod, the right end of the push rod is fixedly connected with a rack, the outer surface of the rack is meshingly connected with a gear, the gear is fixedly sleeved with the bottom end of the fixed cylinder, the bottom surface of the gun body is fixedly connected with a guide rail, the rack moves back and forth along the guide rail through a sliding block, the rack starts to store force when it moves to the right under force, and resets when it is not under force, the bottom surface of the gun body is fixedly connected with a fixed block, the third air pipe penetrates through the fixed block and is fixedly embedded with the fixed block.

[0008] Further, the upper surface of the feeding pipe is inserted with four insertion rods arranged in a circle, and the four insertion rods are fixedly connected with the sealing cover.

[0009] By adopting the above technical scheme, the stability between the sealing cover and the feeding pipe is improved, and the sealing cover is convenient to disassemble and assemble.

[0010] Further, the interior of the bottom end of the gun body is provided with a switch cavity, the interior of the switch cavity is slidably connected with a first piston, the first piston and the junction of the air channel are in a sealed state, the inner wall of the switch cavity is fixedly connected with a blocking ring, the interior of the blocking ring is inserted with a trigger, the right end of the trigger is fixedly connected with the first piston, and the first piston starts to store force when it moves to the right.

[0011] By adopting the above technical scheme, when the trigger is pushed to the right to drive the first piston to move to the right, the air at the upper and lower ends of the air channel can flow, and the first piston resets when it is not under force.

[0012] Further, the pressure regulating cavity is in an inclined shape and penetrates through the air channel, the inner wall of the pressure regulating cavity is slidably connected with a pressure regulating plug, the bottom end of the pressure regulating plug is in a conical shape, the upper end of the pressure regulating plug is fixedly connected with a lead screw, the outer surface of the upper end of the lead screw is threadedly connected with a threaded sleeve, and the threaded sleeve is fixedly connected with the gun body.

[0013] By adopting the above technical scheme, the position of the pressure regulating plug can be controlled by rotating the lead screw, so that the air pressure inside the air channel can be adjusted, and by setting the bottom end of the pressure regulating plug in a conical shape, the variation of air flow when adjusting the air pressure inside the air channel is reduced, and the accuracy of adjusting the air pressure is improved.

[0014] Further, the upper surface of the filter plate is provided with a first sealing groove in the shape of a ring, and a first sealing ring is inserted into the inner wall of the first sealing groove, and the first sealing ring is fixedly connected with the filter cartridge.

[0015] By adopting the above technical scheme, the sealing performance at the intersection of the filter cartridge and the filter plate is improved, and the stability between the filter cartridge and the filter plate is also improved.

[0016] Further, the inside of the gun body is provided with a second sealing groove, a second sealing ring is inserted into the second sealing groove, and the inner wall of the second sealing ring is fixedly connected with the outer surface of the fixing cylinder.

[0017] By adopting the above technical scheme, the sealing performance between the intersection of the fixing cylinder and the gun body is improved, and the conditions of air leakage and material leakage are avoided.

[0018] Compared with the prior art, the gravity type manual spray gun has the following beneficial effects:

[0019] 1. The paint of the present application does not block the filter cartridge, and the paint spraying path can continuously maintain an unobstructed state, so that the condition of air out but no paint spraying can be avoided, the filter cartridge can be automatically dredged by cocking the trigger without disassembly, the operation is simple during replacement, the high-pressure gas can flow through the air channel by cocking the trigger, the purpose of spraying can be achieved, the air pressure in the filter cartridge can be increased, the material supply is facilitated, the material backflow can be avoided, and the spraying pressure can be controlled whether by controlling the pressure regulating plug or the trigger, so that the two scraping brushes are positively and negatively reversed to prevent the filter cartridge from being blocked.

[0020] The air pressure entering from the bottom end of the air channel is large, the pressure regulating cavity and the pressure regulating plug are inclined, the resistance of the pressure regulating plug to the high-pressure gas is increased, the condition that the pressure regulating plug deviates due to excessive air pressure is avoided, the bottom end of the pressure regulating plug is conical, the high-pressure gas can flow outward along the bottom end of the pressure regulating plug when passing through the pressure regulating plug, the impact force of the air pressure is reduced, the pressure regulating plug is further prevented from deviating, the air pressure at the bottom end of the pressure regulating cavity is increased, the gas is beneficial to entering the second air pipe, the conical shape is used to improve the accuracy of pressure regulation.

[0021] The gas flowing out of the second air pipe enters the pressure reducing pipe, the gas flowing to the third air pipe is weakened under the action that the inner diameter of the pressure reducing pipe is larger than the inner diameter of the third air pipe, the air pressure during flow is reduced, and the piston is prevented from being difficult to reset due to excessive force.

[0022] The bottom end of the first cavity is conical, the air pressure in the first cavity is kept high at the top and low at the bottom under the action of the increased air of the fixing cylinder and the gravity of the material, the continuous material supply is facilitated, and the condition that the air out but no paint spraying occurs due to the backflow of the material is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a front view of the gun body of the present application;

[0024] Figure 2 is a sectional view of a rear view of the gun body of the present application;

[0025] Figure 3 is a sectional view of a front view of the gun body of the present application; Figure 2 is an enlarged schematic view of the structure at A in the present application;

[0026] Figure 4 is a sectional view of a front view of the gun body of the present application; Figure 2 is an enlarged schematic view of the structure at B in the present application;

[0027] Figure 5 is a sectional view of a schematic view of the gun body structure of the present application;

[0028] Figure 6 is a sectional view of a left view of the filter cartridge of the present application;

[0029] Figure 7 is a sectional view of a top view of the rack of the present application;

[0030] Figure 8 is a schematic view of the filter cartridge structure of the present application.

[0031] In the figure: 1, gun body; 2, air passage; 3, pressure regulating cavity; 4, feed pipe; 5, first cavity; 6, second cavity; 7, sealing cover; 8, filter cartridge; 9, filter plate; 10, fixed cylinder; 11, scraping brush; 12, fixed rod; 13, sleeve; 14, second sealing groove; 15, first one-way valve; 16, paint tank; 17, threaded cylinder; 18, first air pipe; 19, second air pipe; 20, second one-way valve; 21, third one-way valve; 22, pressure reducing pipe; 23, third air pipe; 24, second piston; 25, push rod; 26, rack; 27, gear; 28, guide rail; 29, switch cavity; 30, first piston; 31, second sealing ring; 32, blocking ring; 33, trigger; 34, pressure regulating plug; 35, screw rod; 36, threaded sleeve; 37, first sealing groove; 38, first sealing ring. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] Please refer to Figures 1-8The application provides a technical scheme: a gravity type manual spray gun, which comprises a gun body 1, a nozzle is installed at the left end of the gun body 1, a connector is installed at the bottom end of the gun body 1, the gun body 1 is connected with the air injection end of an external air compressor through a gas pipe, the gas injected by the air compressor can enter an air channel 2 through the connector, the outer surface of the gun body 1 is treated to prevent slipping, an opening and closing cavity 29 is formed in the inside of the bottom end of the gun body 1, the opening and closing cavity 29 is equal in size to the inner diameter of the air channel 2, a first piston 30 is slidably connected in the opening and closing cavity 29, the intersection between the first piston 30 and the air channel 2 is in a sealed state, a retaining ring 32 is fixedly connected to the inner wall of the opening and closing cavity 29, a trigger 33 is inserted into the retaining ring 32, the right end of the trigger 33 is fixedly connected with the first piston 30, the first piston 30 starts to accumulate force when moving to the right, when the first piston 30 moves to the right driven by the trigger 33 moving to the right, the air at the upper and lower ends of the air channel 2 can flow, and the first piston 30 resets when not under force.

[0034] An air channel 2 and a pressure regulating cavity 3 are formed in the inside of the gun body 1, the air channel 2 is equal in size to the inner diameter of the pressure regulating cavity 3, the air channel 2 is L-shaped, the pressure regulating cavity 3 is inclined, and the pressure regulating cavity 3 penetrates through the air channel 2, a pressure regulating plug 34 is slidably connected to the inner wall of the pressure regulating cavity 3, the bottom end of the pressure regulating plug 34 is conical, a lead screw 35 is fixedly connected to the upper end of the pressure regulating plug 34, a threaded sleeve 36 is threadedly connected to the outer surface of the upper end of the lead screw 35, and the threaded sleeve 36 is fixedly connected with the gun body 1, the position of the pressure regulating plug 34 can be controlled by rotating the lead screw 35, so that the air pressure in the air channel 2 can be adjusted, the bottom end of the pressure regulating plug 34 is conical, which reduces the change of air flow when adjusting the air pressure in the air channel 2, and improves the accuracy of adjusting the air pressure, a feeding pipe 4 is fixedly connected to the outer surface of the gun body 1, four insertion rods arranged in a circle are inserted into the upper surface of the feeding pipe 4, the four insertion rods are fixedly connected with a sealing cover 7, the stability between the sealing cover 7 and the feeding pipe 4 is improved, and the sealing cover 7 is convenient to disassemble and assemble.

[0035] The inside of the feeding pipe 4 is provided with a first cavity 5 and a second cavity 6, the bottom end of the first cavity 5 is conical, and the first cavity 5 is communicated with the second cavity 6, the second cavity 6 is communicated with the gun body 1, the upper surface of the feeding pipe 4 is placed with a sealing cover 7, the bottom surface of the sealing cover 7 is fixedly connected with a filter cylinder 8, the filter cylinder 8 is cylindrical, the bottom surface of the filter cylinder 8 is placed with a filter plate 9, the upper surface of the filter plate 9 is provided with a first sealing groove 37 in the shape of a ring, the inner wall of the first sealing groove 37 is inserted with a first sealing ring 38, the first sealing ring 38 is fixedly connected with the filter cylinder 8, the sealing property of the intersection of the filter cylinder 8 and the filter plate 9 is improved, and the stability between the filter cylinder 8 and the filter plate 9 is also improved, the filter plate 9 is disc-shaped, the inside of the filter plate 9 is fixedly embedded with a fixed cylinder 10 which penetrates up and down, and the fixed cylinder 10 penetrates the gun body 1, the inside of the gun body 1 is provided with a second sealing groove 14, the inside of the second sealing groove 14 is inserted with a second sealing ring 31, the inner wall of the second sealing ring 31 is fixedly connected with the outer surface of the fixed cylinder 10, the sealing property between the intersection of the fixed cylinder 10 and the gun body 1 is improved, and the situation of air leakage and material leakage is avoided.

[0036] The inner wall of the filter cylinder 8 is placed with two symmetrical scraping brushes 11, the side surface of each of the two scraping brushes 11 close to the inner wall of the filter cylinder 8 is arc-shaped, the side surface of each of the two scraping brushes 11 close to each other is fixedly connected with three fixed rods 12 which are arranged at equal distances, the end of each fixed rod 12 close to the fixed cylinder 10 is sleeved with a sleeve pipe 13, each sleeve pipe 13 is fixedly connected with the fixed cylinder 10, a spring is fixedly connected between each fixed rod 12 and the fixed cylinder 10, each spring is in a compressed state, the elastic deformation of the two groups of springs can respectively push the two groups of fixed rods 12 outward, which ensures that the two scraping brushes 11 can be in close contact with the inner wall of the filter cylinder 8, and facilitates the effective scraping work process, the upper end of the fixed cylinder 10 is installed with a first one-way valve 15, the upper side of the gun body 1 is placed with a paint tank 16, the bottom end of the paint tank 16 is rotatably connected with the sealing cover 7 through a sealing bearing, the upper end of the paint tank 16 is installed with a tank cover, the outer surface of the upper end of the feeding pipe 4 is provided with a threaded groove, the bottom end of the paint tank 16 is fixedly connected with a threaded cylinder 17, and the threaded cylinder 17 is screwedly connected with the threaded groove.

[0037] The inside of the gun body 1 is fixedly embedded with a first air pipe 18 and a second air pipe 19, one end of the first air pipe 18 is communicated with the air channel 2, the other end of the first air pipe 18 is rotatably connected with the bottom end of the fixed cylinder 10 through a sealed bearing, the inner walls of the first air pipe 18 and the air channel 2 are respectively provided with a second one-way valve 20 and two symmetrical third one-way valves 21, the third one-way valve 21 located at the rightmost side is close to the nozzle, the force bearing capacity of the second one-way valve 20 is smaller than that of the third one-way valve 21, the right end of the second air pipe 19 is communicated with the bottom end of the pressure regulating cavity 3, the left end of the second air pipe 19 is fixedly communicated with a pressure reducing pipe 22, the two ends of the pressure reducing pipe 22 are in a sealed state, the outer surface of the pressure reducing pipe 22 is fixedly communicated with a third air pipe 23, the inner diameter of the pressure reducing pipe 22 is larger than that of the third air pipe 23, the inner wall of the third air pipe 23 is slidably connected with a second piston 24, the right side surface of the second piston 24 is fixedly connected with a push rod 25, the right end of the push rod 25 is fixedly connected with a rack 26, the outer surface of the rack 26 is meshingly connected with a gear 27, the gear 27 is fixedly sleeved with the bottom end of the fixed cylinder 10, the bottom surface of the gun body 1 is fixedly connected with a guide rail 28, the rack 26 reciprocatingly moves along the guide rail 28 through a sliding block, the rack 26 starts to store force when it moves to the right under force, and resets when it is not under force, the bottom surface of the gun body 1 is fixedly connected with a fixed block, the third air pipe 23 penetrates through the fixed block and is fixedly embedded with the fixed block, thereby improving the stability of the third air pipe 23.

[0038] In use, first, the material is placed in the paint can 16, the paint in the paint can 16 enters the filter cartridge 8, the filter cartridge 8 and the filter plate 9 filter the paint, and the filtered paint enters the first cavity 5, the second cavity 6 and the air channel 2 in turn, at this time, the paint in the air channel 2 is located between the two third one-way valves 21, the joint at the bottom end of the gun body 1 is connected with an external air compressor through an air pipe, and the high-pressure gas sprayed by the air compressor enters the air channel 2;

[0039] Then, pull the trigger 33 will be the first piston 30 to the right end of the switch cavity 29, the air passage 2 bottom end of the high pressure gas to the top, when the gas to the intersection of air passage 2 and pressure regulating chamber 3, the pressure regulating plug 34 inside the pressure regulating chamber 3 to the air block, rotate the screw 35 control the position of the pressure regulating plug 34, can adjust the pressure of the gas to the right end of the flow, up to rotate the screw 35 driven pressure regulating plug 34 to move up, the volume of pressure regulating plug 34 in the air passage 2 decreases, the flow of gas pressure increases, similarly, down to rotate the screw 35 driven pressure regulating plug 34 to move down, the volume of pressure regulating plug 34 in the air passage 2 increases, the flow of gas pressure increases or decreases, the high pressure gas through the pressure regulating plug 34, can along the bottom end of the pressure regulating plug 34 to flow out, not only can reduce the impact force of gas pressure, further avoid the pressure regulating plug 34 offset, but also can enter the bottom end of the pressure regulating chamber 3, increase the gas pressure at the bottom end of the pressure regulating chamber 3, the gas at the bottom end of the pressure regulating chamber 3 into the second gas pipe 19, the pressure regulating chamber 3 is inclined, the bottom end of the pressure regulating plug 34 is conical, can increase the resistance of the pressure regulating plug 34 to high pressure gas, avoid the situation that the pressure regulating plug 34 offset caused by excessive gas pressure, the bottom end of the pressure regulating plug 34 moves, the gas can flow with the bottom end of the pressure regulating plug 34 slowly, so as to improve the accuracy of the pressure regulating;

[0040] Then, the gas in the air passage 2, the second one-way valve 20 is located in the leftmost third one-way valve 21 open, the gas will enter the first gas pipe 18, the gas in the first gas pipe 18 into the fixed cylinder 10, and force the first one-way valve 15 open, can increase the pressure in the filter cylinder 8, make the paint in the filter cylinder 8 can be filtered from the filter cylinder 8 and filter plate 9 and extruded to the first cavity 5, under the action of the first cavity 5 bottom end of the conical shape, the paint pressure in the first cavity 5 and the second cavity 6 is high at the top and low at the bottom, keep the first one-way valve 15 and the second one-way valve 20 can keep the storage of paint, then two third one-way valve 21 open, paint from the nozzle, achieve the effect of spraying paint, avoid the situation of out of gas;

[0041] Finally, the gas inside the second air pipe 19 enters the pressure reducing pipe 22 and the third air pipe 23 in turn, when the air pressure in the third air pipe 23 increases, the second piston 24 moves to the right, the second piston 24 pushes the push rod 25 to the right, the push rod 25 pushes the rack 26 to the right, the rack 26 drives the gear 27 to rotate, the gear 27 drives the fixed cylinder 10 to rotate, the fixed cylinder 10 drives the two sets of sleeve pipes 13 to rotate, the two sets of sleeve pipes 13 drive the two sets of fixed rods 12 to rotate respectively, the two sets of fixed rods 12 drive the two sets of scraping brushes 11 to rotate respectively, the elastic deformation of the two sets of springs can provide outward thrust for the two sets of fixed rods 12 respectively, so that the two scraping brushes 11 contact with the inner wall of the filter cartridge 8, and the two scraping brushes 11 can clean the inner wall of the filter cartridge 8 when rotating, so that the purpose of cleaning the filter cartridge 8 when the gun body 1 sprays paint is achieved, when the pressure regulating plug 34 is adjusted upward, most of the gas flows to the left end of the air channel 2, and the pressure reducing pipe 22 reduces the pressure, so that the air pressure in the third air pipe 23 decreases, the rack 26 resets, and the purpose of rotating the two scraping brushes 11 is achieved again, by controlling the trigger 33, the air pressure in the third air pipe 23 can also be reduced, whether the trigger 33 is controlled or the pressure regulating plug 34 is adjusted, the reciprocating movement of the rack 26 can be achieved, so that the two scraping brushes 11 can be forward and reverse rotated, avoiding the situation that the filter cartridge 8 is blocked, and in summary, the problem that the filter cartridge 8 is easily blocked and the paint spraying path is not smooth, causing the gas to not spray paint, can be solved.

[0042] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions.

[0043] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gravity-driven manual spray gun, comprising a gun body (1), characterized in that: A nozzle is installed at the left end of the gun body (1), and a connector is installed at the bottom end of the gun body (1). The gun body (1) is connected to the jet end of an external air compressor through the connector via an air pipe. An air passage (2) and a pressure regulating chamber (3) are provided inside the gun body (1). The air passage (2) is L-shaped. A feed pipe (4) is fixedly connected to the outer surface of the gun body (1). The feed pipe (4) has a first cavity (5) and a second cavity (6) inside. The bottom end of the first cavity (5) is round. The first cavity (5) and the second cavity (6) are connected. The second cavity (6) is connected to the gun body (1). A sealing cover (7) is placed on the upper surface of the feed pipe (4). A filter cylinder (8) is fixedly connected to the bottom surface of the sealing cover (7). The filter cylinder (8) is cylindrical. A filter plate (9) is placed on the bottom surface of the filter cylinder (8). The filter plate (9) is disc-shaped. A fixed cylinder (10) that runs through the upper and lower parts is fixedly embedded inside the filter plate (9). The fixed cylinder (10) runs through the gun body (1). Two symmetrical scraping brushes (11) are placed on the inner wall of the filter cylinder (8). The two scraping brushes (11) are rounded on one side of the inner wall of the filter cylinder (8). Three fixed rods (12) are fixedly connected to the two scraping brushes (11) on the side that are close to each other. Each fixed rod (12) is fitted with a sleeve (13) at one end near the fixed cylinder (10). Each sleeve (13) is fixedly connected to the fixed cylinder (10). Each fixed rod (12) is fixedly connected to the fixed cylinder (10). Each spring is in a compressed state. A first one-way valve (15) is installed at the upper end of the fixed cylinder (10). A paint can (16) is placed above the gun body (1). The bottom end of the paint can (16) is rotatably connected to the sealing cap (7) through a sealed bearing. A threaded groove is opened on the outer surface of the upper end of the feed pipe (4). A threaded cylinder (17) is fixedly connected to the bottom end of the paint can (16). The threaded cylinder (17) is threadedly connected to the threaded groove. The gun body (1) is internally fitted with a first air pipe (18) and a second air pipe (19). One end of the first air pipe (18) is connected to the air passage (2), and the other end of the first air pipe (18) is rotatably connected to the bottom end of the fixed cylinder (10) through a sealed bearing. The inner walls of the first air pipe (18) and the air passage (2) are respectively equipped with a second one-way valve (20) and two symmetrical third one-way valves (21). The third one-way valve (21) located on the far right is close to the nozzle. The right end of the second air pipe (19) is connected to the bottom end of the pressure regulating chamber (3). The left end of the second air pipe (19) is fixedly connected to a pressure reducing pipe (22). Both ends of the pressure reducing pipe (22) are set to a sealed state. The outer surface of the pressure reducing pipe (22) is fixedly connected to a third air pipe (23). The inner diameter of the decompression tube (22) is larger than the inner diameter of the third air tube (23). The inner wall of the third air tube (23) is slidably connected to the second piston (24). The right side of the second piston (24) is fixedly connected to the push rod (25). The right end of the push rod (25) is fixedly connected to the rack (26). The outer surface of the rack (26) is meshed with the gear (27). The gear (27) is fixedly sleeved with the bottom end of the fixed cylinder (10). The bottom surface of the gun body (1) is fixedly connected to the guide rail (28). The rack (26) moves back and forth along the guide rail (28) through the slider. When the rack (26) is subjected to force and moves to the right, it begins to store force. When it is not subjected to force, it resets. The bottom surface of the gun body (1) is fixedly connected to the fixed block. The third air tube (23) passes through the fixed block and is fixedly embedded with the fixed block.

2. The gravity-driven manual spray gun according to claim 1, characterized in that: The upper surface of the feed tube (4) is fitted with four rods arranged in a circle, and all four rods are fixedly connected to the sealing cover (7).

3. A gravity-driven manual spray gun according to claim 1, characterized in that: The gun body (1) has a switch chamber (29) at the bottom. A first piston (30) is slidably connected inside the switch chamber (29). The first piston (30) and the air passage (2) are sealed. A retaining ring (32) is fixedly connected to the inner wall of the switch chamber (29). A trigger (33) is inserted inside the retaining ring (32). The right end of the trigger (33) is fixedly connected to the first piston (30). When the first piston (30) moves to the right, it begins to store power.

4. A gravity-driven manual spray gun according to claim 1, characterized in that: The pressure regulating chamber (3) is inclined and passes through the air channel (2). The inner wall of the pressure regulating chamber (3) is slidably connected to a pressure regulating plug (34). The bottom end of the pressure regulating plug (34) is conical. The upper end of the pressure regulating plug (34) is fixedly connected to a lead screw (35). The outer surface of the upper end of the lead screw (35) is threadedly connected to a threaded sleeve (36), and the threaded sleeve (36) is fixedly connected to the gun body (1).

5. A gravity-driven manual spray gun according to claim 1, characterized in that: The filter plate (9) has a first sealing groove (37) in the shape of a ring on its upper surface. A first sealing ring (38) is inserted into the inner wall of the first sealing groove (37). The first sealing ring (38) is fixedly connected to the filter cylinder (8).

6. A gravity-driven manual spray gun according to claim 1, characterized in that: The gun body (1) has a second sealing groove (14) inside, and a second sealing ring (31) is inserted into the second sealing groove (14). The inner wall of the second sealing ring (31) is fixedly connected to the outer surface of the fixed cylinder (10).

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