A pneumatic screw stirring spray gun

Abstract

The present invention discloses a pneumatic spiral stirring spray gun, which comprises a spray pot, a pot cover and a spray gun body. The pot cover is hermetically covered on the mouth of the spray pot. A diversion cover is installed on the pot cover. An installation end is provided at the upper end of the diversion cover. The upper ends of the installation end and the central conduit are connected to a feed joint on the spray gun body. A hollow connecting rod is sleeved outside the parts of the spray pot and the diversion cover of the central conduit. The connecting rod and the central conduit are connected and installed through a bearing. A flywheel is installed in the diversion cover. The flywheel is fixedly installed at the upper end of the connecting rod. Uniform flywheel blades are arranged on the outer side wall of the flywheel. A positioning block is fixedly installed on the outer wall of the lower end of the connecting rod. A stirrer is fixedly installed at the bottom of the positioning block; By installing a pneumatic spiral stirring mechanism in the spray pot and driving the spiral stirring mechanism to stir through a pneumatic flywheel, the phenomenon of layering of the sprayed coating is avoided, so as to affect the uniformity, thickness and discreteness after spraying.

Description

Technical Field

[0001] The present invention relates to the technical field of spray gun structures, and particularly to a pneumatic spiral stirring suction type spray gun for use in suspension spraying. Background Art

[0002] Manual spray guns can be divided into three types according to their spraying principles: pressure-fed type - P, gravity-fed type - G, and suction type - S.

[0003] Pressure-fed manual spray gun: It is mainly supplied from an external paint supply pump or pressure tank / pressure barrel. Such a paint supply pressure method can supply paint to several spray guns simultaneously. This spray gun designs the paint nozzle and the air cap core hole on the same plane, so that no certain negative pressure will be formed at the front end of the paint nozzle.

[0004] Gravity-fed manual spray gun: Also known as an upper pot spray gun, it mainly uses gravity to draw the paint from the upper pot to the lower nozzle, and then uses wind power to atomize and spray it. It can perform comprehensive spraying. Its main advantage is that it can be used for small-area repairs and is very paint-saving. The gravity-fed spray gun is very suitable for spraying operations where the paint consumption is small and color change is required frequently. When the paint consumption is relatively large, a high-position paint tank can be added additionally and connected to the spray gun with a rubber hose. In this case, the paint spray volume can be adjusted by changing the height of the paint tank.

[0005] Suction type manual spray gun: The principle of the suction type spray gun is mainly to use high-speed air flow to make the local area of the spray gun in a vacuum state. Due to the suction generated, the paint is sucked from the pot to the nozzle and atomized for spraying. It is mainly used for large-area spraying. Its advantage is that the paint has a good atomization effect and can meet the requirements of the coating thickness and gloss.

[0006] The paint tank of the suction type spray gun is generally located at the lower part of the spray gun. The paint nozzle is generally in the center hole of the air cap and protrudes slightly forward. Compressed air will be ejected from the center hole of the air cap, that is, around the paint nozzle, forming a negative pressure at the front end of the paint nozzle, sucking the paint out of the paint tank and atomizing it. The paint spray volume of the suction type spray gun is significantly affected by the paint viscosity and density to a certain extent, and is very closely related to the diameter of the paint nozzle. The suction type spray gun is mainly suitable for general non-continuous spraying operation occasions and has a good effect.

[0007] During the actual use of a suction-type manual spray gun, due to the different materials of the sprayed coatings, especially when there is a large density difference between the coatings, the coatings will be stratified during continuous spraying, affecting the uniformity, thickness, and discreteness after spraying. To solve this problem, the present invention discloses a pneumatic spiral stirring device for use in the spray pot of a spray gun during the suspension spraying process. Summary of the Invention

[0008] The object of the present invention is to provide a pneumatic spiral stirring spray gun.

[0009] The above technical object of the present invention is achieved through the following technical solutions:

[0010] A pneumatic spiral stirring spray gun includes a spray pot, a pot cover, and a spray gun body. The pot cover is hermetically covered on the mouth of the spray pot. A diversion cover is installed on the pot cover. Through holes for the central conduit to pass through are provided on both the pot cover and the diversion cover. An installation end is provided at the upper end of the diversion cover. The upper ends of the installation end and the central conduit are connected to the feed joint on the spray gun body. A hollow connecting rod is sleeved outside the part of the central conduit located in the spray pot and the diversion cover. The connecting rod is connected and installed with the central conduit through a bearing. A flywheel is installed inside the diversion cover. The flywheel is fixedly installed at the upper end of the connecting rod. Uniformly distributed flywheel blades are provided on the outer side wall of the flywheel. A positioning block is fixedly installed on the outer wall of the lower end of the connecting rod. A stirrer is fixedly installed at the bottom of the positioning block. A sealing ring is provided between the inner wall of the bottom of the connecting rod and the central conduit. An air inlet for diversion and an air outlet for diversion are provided on the side wall of the diversion cover. The air inlet for diversion is connected to a gas source or a pneumatic control mechanism. The gas source is an air pump or a high-pressure gas storage tank, etc. The pneumatic control mechanism is installed on the base of the spray gun body. The air inlet end of the pneumatic control mechanism is connected to the gas source, and the air outlet end of the pneumatic control mechanism is connected to the diversion cover. The pneumatic control mechanism is used to control the on-off between the gas source and the diversion cover. The above gas source can be the same as the gas source of the air inlet joint of the spray gun, and there is no need to additionally set a stirring power source.

[0011] Further, the pneumatic control mechanism includes an adjusting knob, an air inlet chamber, a valve block, an air outlet valve chamber, a spring and a guide rod. The valve block is installed in the air outlet valve chamber. The valve block is fixedly connected to one end of the guide rod. The other end of the guide rod extends out of the base. A sealing ring is installed in the guide hole of the base through which the guide rod passes. A compressed spring is inserted outside the guide rod located in the air outlet valve chamber. The spring pushes the valve block to fit and seal with the air inlet sealing surface of the air outlet valve chamber, separating the air inlet chamber from the air outlet valve chamber. The adjusting knob is installed at the upper end of the air inlet chamber through a threaded structure, and the adjusting knob, the valve block and the guide rod are on the same axis. By rotating the adjusting knob, it can move up and down relative to the base, and push the valve block open or interfere with the inner buckle of the trigger. The air inlet of the air inlet chamber is equipped with a pneumatic air inlet joint, and the pneumatic air inlet joint is connected to the air source; the air outlet of the air outlet valve chamber is equipped with a pneumatic air outlet joint, and the pneumatic air outlet joint is connected to the air inlet of the diversion cover through an air pipe.

[0012] Further, the air inlet direction of the diversion air inlet and the air outlet direction of the diversion air outlet are set on the same straight line, and the distance between the connection line of the two and the axis of the diversion cover is half of the radius of the diversion cover. This setting can ensure that the contact area between the airflow entering the diversion cover and the blade surface of the flywheel is maximized, improving the airflow work efficiency.

[0013] Further, the inner wall of the bottom of the diversion cover is provided with an internal connecting thread, and the upper end of the kettle lid is provided with a protruding connecting ring, and the outer side of the connecting ring is provided with an external thread that matches the internal connecting thread.

[0014] Further, the stirrer is provided with mounting holes, and the stirring blades are connected to the fixing blocks through fixing screws passing through the mounting holes.

[0015] Further, the stirrer is installed with spiral blades. Compared with blades of other shapes, the spiral blades can better make liquids such as paint move up and down, reducing the layering phenomenon.

[0016] Preferably, both the flywheel and the positioning block are installed at both ends of the connecting rod by an interference fit method and are adhesively fixed again with glue. Similarly, other installation and fixing methods can also be adopted, such as setting threaded holes on the side wall of the flywheel middle shaft sleeve or the positioning block, and fixing them to the side wall of the connecting rod with screws.

[0017] In summary, the present invention has the following beneficial effects:

[0018] 1. By installing a pneumatic spiral stirring mechanism in the spray kettle and driving the spiral stirring mechanism to stir through a pneumatic flywheel, the layering phenomenon of the sprayed paint is avoided, thus affecting the uniformity, thickness and discreteness after spraying.

[0019] 2. By setting up a pneumatic control mechanism on the base of the spray gun, it can prompt the operator to open the valve for pre-stirring before normal spraying, thus avoiding misoperations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the internal installation structure of the spray pot;

[0021] Figure 2 is a schematic diagram of the installation part of the propeller;

[0022] Figure 3 is a schematic diagram of the structure of the deflector cover;

[0023] Figure 4 is a schematic diagram of the structure of the flywheel;

[0024] Figure 5 is a schematic diagram of the structure of the stirring blade;

[0025] Figure 6 is a schematic diagram of the external structure when the present invention is installed and used;

[0026] Figure 7 is a schematic diagram of the structure of the pneumatic control mechanism part.

[0027] In the figures, 1. Spray pot; 2. Pot cover; 3. Deflector cover; 4. Central conduit; 5. Connecting rod; 6. Flywheel; 7. Bearing; 8. Positioning block; 9. Stirrer; 10. Fixing screw; 11. Sealing ring; 12. Deflector air inlet; 13. Deflector air outlet; 14. Installation end; 15. Connecting internal thread; 16. Flywheel blade; 17. Helical blade; 18. Installation hole; 19. Spray gun body; 20. Feed joint; 21. Trigger; 22. Base; 23. Spray gun air inlet joint; 24. Pneumatic air inlet joint; 25. Adjusting knob; 26. Air inlet pipe; 27. Pneumatic air outlet joint; 28. Air inlet cavity; 29. Valve block; 30. Air outlet valve cavity; 31. Spring; 32. Guide rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following further describes the present invention in detail with reference to the accompanying drawings. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] As Figure 1-2As shown in the figure, a pneumatic spiral stirring spray gun includes a spray pot 1, a pot lid 2, and a spray gun body 19. The pot lid 2 is hermetically covered on the mouth of the spray pot 1. A diversion cover 3 is installed on the pot lid 2. Through holes for a central conduit 4 to pass through are provided on both the pot lid 2 and the diversion cover 3. An installation end 14 is provided at the upper end of the diversion cover 3. The upper ends of the installation end 14 and the central conduit 4 are connected to a feed joint 20 on the spray gun body 19. A hollow connecting rod 5 is sleeved outside the part of the central conduit 4 located in the spray pot 1 and the diversion cover 3. The connecting rod 5 and the central conduit 4 are connected and installed through a bearing 7. Shoulder parts (not shown in the figure) for installing the bearing 7 are provided on the outer side wall of the central conduit 4 and the inner side wall of the connecting rod 5. From top to bottom, the outer diameter of the central conduit 4 gradually increases along with the shoulder of the installation bearing 7. This setting can ensure the installation and positioning of the bearing 7. Solidifying glue can be applied to the inner and outer rings of the bearing 7 for solidification to ensure the connection stability between the central conduit 4, the connecting rod 5, and the bearing. The connecting rod 5 can only rotate relative to the central conduit 4 through the inner and outer rings of the bearing 7. A flywheel 6 is installed inside the diversion cover 3. The flywheel 6 is fixedly installed at the upper end of the connecting rod 5. Uniformly distributed flywheel blades 16 are provided on the outer side wall of the flywheel 6. A positioning block 8 is fixedly installed on the outer wall of the lower end of the connecting rod 5. A stirrer 9 is fixedly installed at the bottom of the positioning block 8. A sealing ring 11 is provided between the inner wall of the bottom of the connecting rod 5 and the central conduit 4. A diversion air inlet 12 and a diversion air outlet 13 are provided on the side wall of the diversion cover 3. Preferably, the air inlet direction of the diversion air inlet 12 and the air outlet direction of the diversion air outlet 13 are set on the same straight line, and the distance between the connection line of the two and the axis of the diversion cover 3 is half of the radius of the diversion cover 3. This setting can ensure the maximum contact area between the air flow entering the diversion cover 3 and the leaf surface of the flywheel blades 16 and improve the working efficiency of the air flow in pushing the flywheel blades 16. The diversion air inlet 12 is connected to a gas source or a pneumatic control mechanism. The gas source is an air pump or a high-pressure gas storage tank, etc. The pneumatic control mechanism is installed on the base 22 of the spray gun body 19. The air inlet end of the pneumatic control mechanism is connected to the gas source, and the air outlet end of the pneumatic control mechanism is connected to the diversion cover 3. The pneumatic control mechanism is used to control the opening and closing between the gas source and the diversion cover 3. The diversion air inlet 12 of the diversion cover 3 can also be directly connected to the gas source. The above gas source can be the same as the gas source of the gas inlet joint 23 of the spray gun, and there is no need to additionally set a stirring power source.

[0030] Further, as Figure 6 and Figure 7As shown in the figure, the pneumatic control mechanism includes an adjustment knob 25, an air inlet chamber 28, a valve block 29, an air outlet valve chamber 30, a spring 31, and a guide rod 32. The valve block 29 is installed in the air outlet valve chamber 30. The valve block 29 is fixedly connected to one end of the guide rod 32. The other end of the guide rod 32 extends outside the base 22. A sealing ring is installed in the guide hole of the base 22 through which the guide rod 32 is inserted. A compressed spring 31 is inserted outside the guide rod 32 located in the air outlet valve chamber 30. The spring 31 pushes the valve block 29 to fit and seal with the air inlet sealing surface of the air outlet valve chamber 30. When designing the elastic force of the spring 31, it should be greater than the thrust of the high air pressure formed by the air source in the air inlet chamber 28 on the top of the valve block 29 (to prevent the high-pressure gas from directly pushing open the valve block 29, and only the valve block 29 can be pushed open by rotating the adjustment knob 25), separating the air inlet chamber 28 from the air outlet valve chamber 30. The adjustment knob 25 is installed at the upper end of the air inlet chamber 28 through a threaded structure, and the adjustment knob 25, the valve block 29, and the guide rod 32 are on the same axis. By rotating the adjustment knob 25, it can move up and down relative to the base 22, and push open the valve block 29 or interfere with the inner buckle of the trigger 21. A pneumatic air inlet joint 24 is installed at the air inlet of the air inlet chamber 28, and the pneumatic air inlet joint 24 is connected to the air source; a pneumatic air outlet joint 27 is installed at the air outlet of the air outlet valve chamber 30, and the pneumatic air outlet joint 27 is connected to the air inlet 12 of the flow guide cover 3 through an air pipe 26. Specifically, when the adjustment knob 25 rotates downward and pushes open the valve block 29, the air source is connected to the flow guide cover 3, and the air flow passes through the flow guide cover 3 to drive the flywheel 6 to drive the connecting rod 5 and the stirrer 9 to rotate and stir. At this time, the trigger 21 can be freely buckled inward for spraying operation; when the adjustment knob 25 moves upward, the valve block 29 is sealed, and the upper end of the adjustment knob 25 interferes with the inner buckle of the trigger 21, and the spray gun cannot perform normal spraying operation at this time, prompting the operator to first lower the adjustment knob 25, push open the valve block 29 for pre-stirring and then perform spraying operation.

[0031] Further, as Figure 3 shown, the inner wall of the bottom of the flow guide cover 3 is provided with a connecting internal thread 15, and the upper end of the kettle lid 2 is provided with a protruding connecting ring. The outer side of the connecting ring is provided with an external thread that matches the connecting internal thread 15. The flow guide cover 3 and the kettle lid 2 are connected by a threaded structure, which is convenient for disassembling the flow guide cover for the maintenance of the flywheel 6.

[0032] Further, referring to Figure 2 shown, the stirrer 9 is provided with a mounting hole 18. The stirring blade 9 is connected to the fixing block 8 through a fixing screw 10 passing through the mounting hole 18 and is fixed by the fixing bolt 10, which is convenient for the replacement of the stirrer 9.

[0033] Further, as Figure 4As shown, the spiral blade 17 is installed on the stirrer 9. Compared with blades of other shapes, the spiral blade 17 can better make liquids such as paint move up and down, reducing the layering phenomenon.

[0034] Preferably, both the flywheel 6 and the positioning block 8 are installed at both ends of the connecting rod 5 by interference fit and are adhesively fixed again with glue. Similarly, other installation and fixing methods can also be adopted. For example, a threaded hole is provided in the bushing of the flywheel 6 or on the side wall of the positioning block 8, and it is fixed to the side wall of the connecting rod 5 with a screw.

[0035] Working principle: During use, first rotate the adjustment knob 25 to move it downward to push open the valve block 29. The high-pressure gas in the air source flows into the diversion cover 3 through the air inlet 12, pushing the flywheel 6 to rotate. The rotation of the flywheel 6 drives the connecting rod 5 and the stirrer to stir, avoiding the phenomenon of uneven paint layering. If the adjustment knob 25 is not rotated first, the adjustment knob 25 will interfere with the inward buckling of the trigger 21, avoiding the misoperation of spraying without stirring. After spraying, release the trigger 21, and then the adjustment knob 25 returns to its original position, cutting off the stirring power source. The air source for stirring and the air source for spraying can use the same air source without the need to additionally increase a power source.

[0036] This specific embodiment is only an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A pneumatic spiral stirring spray gun, comprising a spray pot (1), a pot lid (2) and a spray gun body (19), wherein the pot lid (2) is sealingly covered on the mouth of the spray pot (1), and is characterized in that: A flow guide cover (3) is installed on the kettle lid (2). Through holes for a central conduit (4) to pass through are provided on both the kettle lid (2) and the flow guide cover (3). An installation end (14) is provided at the upper end of the flow guide cover (3). The upper ends of the installation end (14) and the central conduit (4) are connected to a feed joint (20) on the spray gun body (19). A hollow connecting rod (5) is sleeved outside the parts of the central conduit (4) located in the spray kettle (1) and the flow guide cover (3). The connecting rod (5) and the central conduit (4) are connected and installed through a bearing (7). A flywheel (6) is installed inside the flow guide cover (3). The flywheel (6) is fixedly installed at the upper end of the connecting rod (5). Uniform flywheel blades (16) are provided on the outer side wall of the flywheel (6). A positioning block (8) is fixedly installed on the outer wall of the lower end of the connecting rod (5). A stirrer (9) is fixedly installed at the bottom of the positioning block (8). A sealing ring (11) is provided between the inner wall of the bottom of the connecting rod (5) and the central conduit (4). A flow guide air inlet (12) and a flow guide air outlet (13) are provided on the side wall of the flow guide cover (3). The flow guide air inlet (12) is connected to a pneumatic control mechanism. The pneumatic control mechanism is installed on the base (22) of the spray gun body (19). The air inlet end of the pneumatic control mechanism is connected to a gas source, and the air outlet end of the pneumatic control mechanism is connected to the flow guide cover (3). The pneumatic control mechanism is used to control the opening and closing between the gas source and the flow guide cover (3). The pneumatic control mechanism includes an adjustment knob (25), an air inlet cavity (28), a valve block (29), an air outlet valve cavity (30), a spring (31), and a guide rod (32). The valve block (29) is installed in the air outlet valve cavity (30). The valve block (29) is fixedly connected to one end of the guide rod (32). The other end of the guide rod (32) extends outside the base (22). A sealing ring is installed in the guide hole of the base (22) through which the guide rod (32) passes. A compressed spring (31) is sleeved outside the guide rod (32) located in the air outlet valve cavity (30). The spring (31) pushes the valve block (29) to fit and seal with the air inlet sealing surface of the air outlet valve cavity (30), separating the air inlet cavity (28) from the air outlet valve cavity (30). The adjustment knob (25) is installed at the upper end of the air inlet cavity (28) through a threaded structure, and the adjustment knob (25), the valve block (29), and the guide rod (32) are on the same axis. By rotating the adjustment knob (25), it can move downward or upward relative to the base (22), and push the valve block (29) open or interfere with the inner buckle of the trigger (21). A pneumatic air inlet joint (24) is installed at the air inlet of the air inlet cavity (28). The pneumatic air inlet joint (24) is connected to the gas source. A pneumatic air outlet joint (27) is installed at the air outlet of the air outlet valve cavity (30). The pneumatic air outlet joint (27) is connected to the flow guide air inlet (12) of the flow guide cover (3) through an air inlet pipe (26).

2. The pneumatic spiral stirring spray gun according to claim 1, wherein: The intake direction of the diversion air inlet (12) and the outlet direction of the diversion air outlet (13) are set on the same straight line, and the distance between the connection line of the two and the axis of the diversion cover (3) is half of the radius of the diversion cover (3).

3. The pneumatic spiral stirring spray gun according to claim 2, characterized in that: The inner wall of the bottom of the diversion cover (3) is provided with an internal connecting thread (15), and the upper end of the kettle lid (2) is provided with a protruding connecting ring, and the outer side of the connecting ring is provided with an external thread that cooperates with the internal connecting thread (15).

4. The pneumatic spiral stirring spray gun according to claim 3, characterized in that: The stirrer (9) is provided with a mounting hole (18), and the stirrer (9) is connected to the positioning block (8) through a fixing screw (10) passing through the mounting hole (18).

5. The pneumatic spiral stirring spray gun according to claim 4, characterized in that: The stirrer (9) is installed with a spiral blade (17) in a spiral shape.

6. The pneumatic spiral stirring spray gun according to claim 1, characterized in that: Both the flywheel (6) and the positioning block (8) are installed at both ends of the connecting rod (5) by an interference fit method and are adhesively fixed again with glue.

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