A spraying device

Abstract

The present invention relates to the technical field of spraying devices, and specifically discloses a spraying device, wherein a coaxial and rotatable filter cartridge is arranged in a gun barrel, the top end of the filter cartridge is closed and the bottom end is open, a filter hole is arranged on the circumferential wall of the filter cartridge, a recoil push piece is mounted on the inner wall surface of the circumferential wall of the filter cartridge to slide radially along the filter cartridge, and an interlayer cavity is formed between the recoil push piece and the circumferential wall; a cam column is concentrically arranged in the filter cartridge and connected to the gun barrel, the cam column has a cam section located on the inner side of the recoil push piece, and the cam section has a protruding portion for sequentially pushing each recoil push piece outward when the filter cartridge and the cam column rotate relative to each other, so as to squeeze the solution in the interlayer cavity and force part of the solution to flow out from the filter hole in the reverse direction to clean the filter cartridge. The spraying device of the present invention can backwash the filter cartridge by arranging the cam column and the recoil push piece, thereby extending the service life of a single filter cartridge, reducing the replacement frequency of the filter cartridge, and reducing the labor of the operator.

Description

Technical Field

[0001] The invention relates to the technical field of spraying devices, and in particular to a spraying device. Background Art

[0002] Polyimide solution is a high-performance polymer solution, mainly formed by dissolving polyimide resin in an appropriate solvent. Polyimide solution can be cured at high temperature to form a coating or film with excellent mechanical properties and thermal stability. Therefore, polyimide solution is often used in electronics, aerospace, automobile and other fields to prepare high-performance coatings, films, composite materials, etc.

[0003] A Chinese patent document with authorization announcement number CN220195304U discloses a spray machine for preventing back contamination, which includes a spray mechanism, which includes a lifting frame and a spray assembly installed on the lifting frame. The substrate is placed on a support table, and the polyimide solution is sprayed onto the substrate using the spray assembly, thereby realizing the spraying operation of the substrate. After completion, the substrate is moved to the next process manually or by an external robot.

[0004] In the prior art, the spraying assembly of the polyimide solution generally adopts a spray gun. Some polyimide solutions contain impurities such as dust, metal chips, solid particles, etc. Direct spraying may affect the coating quality, and the impurities flow in the spray gun, which may cause collision, wear, blockage and other phenomena with the spray gun, thereby affecting the service life of the spray gun. Therefore, the prior art will filter and remove impurities from the polyimide solution before spraying, and the filtering structure can be integrated inside the spray gun. However, after filtering for a period of time, the filter material is easily blocked by impurities, so the filter material needs to be replaced and cleaned. In this way, the filter material needs to be replaced more frequently due to the blockage phenomenon during use, which increases the workload of the operator.

[0005] Therefore, the art needs a spraying device to solve the above problems. Summary of the invention

[0006] The present invention provides a spraying device, aiming to solve the problem in the related art that filter materials need to be replaced frequently due to clogging of the filter materials.

[0007] The spraying device of the present invention comprises a frame, on which a spray gun for spraying a spray object is installed, the spray gun comprises a gun barrel and a cam column, the top end of the gun barrel is provided with a liquid inlet for introducing a polyimide solution, a coaxial and rotatable filter cartridge is provided in the gun barrel, the top end of the filter cartridge is closed and the bottom end is open, a filter hole connected to the liquid inlet is provided on the circumferential wall of the filter cartridge; a recoil thrust piece is mounted on the inner wall surface of the circumferential wall along the radial sliding direction of the filter cartridge, a plurality of recoil thrust pieces are distributed at intervals along the circumferential direction, and a sandwich cavity is formed between each recoil thrust piece and the circumferential wall. The interlayer cavity is connected with the filter hole and the bottom opening of the filter cartridge, so that the solution filtered from the filter hole into the filter cartridge flows to the bottom opening of the filter cartridge through the interlayer cavity; the cam column is concentrically placed in the filter cartridge and connected to the gun barrel, and the cam column has a cam section located on the inner side of the recoil push piece, and the cam section has a protruding portion for sequentially pushing each recoil push piece outward when the filter cartridge and the cam column rotate relative to each other, so as to squeeze the solution in the interlayer cavity and force part of the solution to flow out from the filter hole in the reverse direction to clean the filter cartridge; the bottom end of the gun barrel is provided with a nozzle connected with the bottom opening of the filter cartridge.

[0008] The effect is that when the spray gun is used normally, the solution is discharged from the liquid inlet, the filter hole of the filter cartridge, the interlayer cavity and the nozzle at the bottom of the spray gun, and is normally filtered through the filter hole of the filter cartridge. After a period of use, the filter cartridge can be rotated relative to the cam column, so that the cam segments on the cam column can be used to push the recoil push piece outward in sequence. The recoil push piece moves outward, which can squeeze the solution in the interlayer cavity and force part of the solution to flow out from the filter hole in the reverse direction. When flowing out, the solution can backwash the impurities attached to the outer wall of the filter cartridge, thereby keeping the filter hole of the filter cartridge unobstructed and avoiding it from being blocked by impurities. By setting the cam column and the recoil push piece, the filter cartridge can be backwashed, which prolongs the service life of a single filter cartridge, reduces the replacement frequency of the filter cartridge, and reduces the operator's labor.

[0009] Preferably, a closing plate for closing the opening area of ​​the bottom of the filter cartridge is provided at the bottom end of the cam column, and the closing plate corresponds to the position of the raised portion of the cam column in the circumferential direction of the cam column, so as to block the interlayer cavity corresponding to the recoil push piece when the raised portion pushes the corresponding recoil push piece to move outward.

[0010] The effect is that when the filter cartridge drives the sandwich cavity to rotate toward the protruding part, the bottom of the sandwich cavity will be gradually closed by the closing plate, preventing the polyimide solution in the sandwich cavity from flowing downward. When the recoil pusher is pushed outward, the polyimide solution in the sandwich cavity can only be recoiled to the outside through the filter hole of the filter cartridge, ensuring the uniqueness and stability of the flow of the polyimide solution in the sandwich cavity. When the sandwich cavity gradually moves away from the protruding part during rotation, the bottom of the sandwich cavity will gradually break away from the closing plate and remain unobstructed, so that the polyimide solution entering the sandwich cavity can flow downward under its own weight.

[0011] Preferably, at least two inner pushers are mounted on the cam column for radial sliding along the filter cartridge, and when sliding outward, the inner pushers can push the corresponding recoil pushers outward to the extreme position so that the solution in the interlayer cavity can be emptied; and a driving assembly for driving the inner pushers to slide outward is provided on the gun barrel.

[0012] The effect is that when the inner push piece pushes the recoil push piece to move outward to the limit position, the outer surface of the recoil push piece fits with the wall of the filter cartridge, thereby making the volume of the interlayer cavity approach zero, realizing the emptying of the polyimide solution in the interlayer cavity, avoiding the solidification and condensation of the polyimide solution in the interlayer cavity, and ensuring the sustainable use of the recoil push piece.

[0013] Preferably, the driving assembly includes a push rod and a telescope, the push rod is vertically inserted into the cam column and can slide up and down, the push rod is connected to the inner push member through a transmission member, so that when the push rod moves downward, it can push the inner push member to slide outward; the telescope is installed on the gun barrel and connected to the push rod to drive the push rod to slide up and down.

[0014] Preferably, the transmission member comprises a connecting rod, and two ends of the connecting rod are respectively hinged to the push rod and the inner push member.

[0015] The effect is that the connecting rod can convert the up-and-down movement of the push rod into the horizontal movement of the inner push member through its planar movement.

[0016] Preferably, the gun barrel is divided into a first pipe section, a sliding pipe section and a second pipe section from top to bottom, the first pipe section and the second pipe section are connected by a connecting rod, the sliding pipe section is clamped between the first pipe section and the second pipe section and can slide up and down, and during sliding, the sliding pipe section keeps the interval area between the first pipe section and the second pipe section closed; the sliding pipe section is connected to the top end of the push rod; the telescope is installed on the outside of the second pipe section and connected to the sliding pipe section.

[0017] The effect is that the sliding pipe section still keeps the interval area between the first pipe section and the second pipe section closed during sliding, thereby preventing foreign matter from entering the gun barrel and preventing the polyimide solution in the gun barrel from leaking. At the same time, the sliding pipe section also plays a role of connecting and converting between the push rod and the telescopic device, serving as a connecting medium between the two.

[0018] Preferably, an inner tube body is rotatably mounted on the inner wall of the gun barrel, and the inner tube body is sleeved on the outer peripheral side of the filter cartridge, and there is an annular gap between the two, the top end of the annular gap is open and the bottom end is closed, and the annular gap is respectively connected to the liquid inlet and the filter hole;

[0019] The gun barrel is provided with a liquid spray chamber, the liquid spray chamber is located below the annular gap and above the nozzle, the filter cartridge is connected with a stirring member, and the stirring member extends into the liquid spray chamber.

[0020] The effect is that when the spraying work is suspended, the filter cartridge can control the rotation of the stirring member, and the stirring member stirs the polyimide solution in the spray chamber to prevent its condensation and precipitation, ensure its fluidization characteristics, and thus maintain its use effect.

[0021] Preferably, a blocking plate is provided at the bottom end of the recoil push member, and the blocking plate is used to block another part of the bottom opening of the filter cartridge when the recoil push member moves outward to the extreme position.

[0022] The effect is that under the double sealing effect of the blocking plate and the closing plate, the internal space of the filter cartridge is isolated from the spray chamber, so that the spray chamber can be treated separately.

[0023] Preferably, the inner tube body is provided with an inner liquid outlet, the gun barrel is provided with an outer liquid outlet corresponding to the inner liquid outlet, and the outer liquid outlet and the inner liquid outlet are connectable; the gun barrel is provided with a cleaning agent inlet and a cleaning agent outlet connected to the liquid spray chamber, and the outer liquid outlet, the cleaning agent inlet and the cleaning agent outlet are all equipped with detachable threaded plugs.

[0024] Preferably, a driver for driving the inner tube body to rotate is installed on the gun barrel.

[0025] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0026] The present invention can backwash the filter cartridge by arranging the cam column and the backwash push piece, thereby extending the service life of a single filter cartridge, reducing the replacement frequency of the filter cartridge, and reducing the labor of the operator.

[0027] The present invention provides a stirring member so that when the spraying work is suspended, the stirring member rotates with the filter cartridge to stir the polyimide solution in the spray chamber to avoid its condensation and precipitation, ensure its fluidization characteristics, and thus maintain its use effect.

[0028] The present invention provides an inner push piece so that it can push the recoil push piece to move outward, thereby achieving the effect of the outer surface of the recoil push piece being in contact with the wall of the filter cartridge, thereby making the volume of the interlayer cavity approach zero, achieving the emptying treatment of the polyimide solution in the interlayer cavity, avoiding the solidification and condensation of the polyimide solution in the interlayer cavity, and ensuring the sustainable use of the recoil push piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the appearance of the spraying device of the present invention.

[0030] Figure 2 It is an axonometric schematic diagram of the spray gun of the present invention.

[0031] Figure 3 It is a schematic cross-sectional view of a spray gun of the present invention.

[0032] Figure 4 It is a schematic cross-sectional view of the spray gun of the present invention.

[0033] Figure 5 It is an axonometric schematic diagram of the push rod to cam column portion of the present invention.

[0034] Figure 6 It is a schematic structural diagram of the push rod to the inner push piece portion of the present invention.

[0035] Figure 7 It is a schematic structural diagram of the blocking plate of the present invention when the annular groove is not closed.

[0036] Figure 8 It is a schematic structural diagram of the blocking plate of the present invention when the annular groove is closed.

[0037] Fig. 9 It is an axonometric schematic diagram of the inner tube body portion of the present invention.

[0038] Reference numerals:

[0039] 100, rack; 101, stage; 1011, suction cup; 200, three-dimensional moving mechanism; 201, X-axis slide rail; 202, Y-axis slide rail; 203, Z-axis mounting rod; 300, spray gun;

[0040] 1. Gun barrel; 11. Liquid inlet pipe; 12. Inner tube body; 121. Gear ring; 122. Inner liquid outlet; 13. Liquid spray chamber; 14. Spray nozzle; 15. External liquid outlet; 16. First tube section; 161. Connecting rod; 17. Sliding tube section; 171. Connecting plate; 1711. Liquid through hole; 18. Second tube section; 181. Cleaning agent inlet; 182. Cleaning agent outlet;

[0041] 2. Cam column; 21. Closing plate; 211. Circular plate body; 212. Arc plate body; 22. Inner push piece; 23. Main shaft portion; 24. Protruding portion;

[0042] 3. Filter cartridge; 31. Recoil push piece; 311. Interlayer cavity; 312. Blocking plate; 32. Ring groove;

[0043] 4. Annular gap;

[0044] 5. flange; 51. stirring member;

[0045] 6. Push rod; 61. Joint; 62. Clamp;

[0046] 7. Telescopic device;

[0047] 8. Connecting rod. DETAILED DESCRIPTION

[0048] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0049] Combine the following Figures 1 to 9 The spraying device of the present invention is described.

[0050] like Figure 1 As shown, the spraying device of the present invention includes a frame 100, a three-dimensional moving mechanism 200 and a spray gun 300.

[0051] The frame 100 has a carrier 101 for placing the object to be sprayed. A suction cup 1011 can be provided on the carrier 101 , and the object to be sprayed is adsorbed on the suction cup 1011 , thereby being firmly fixed to the carrier 101 .

[0052] The three-dimensional moving mechanism 200 is installed on the frame 100, and the spray gun 300 is connected thereto. The three-dimensional moving mechanism 200 includes an X-direction slide rail 201, a Y-direction slide rail 202, a mounting seat, and a Z-direction mounting rod 203. The X-direction slide rail 201 is fixed on the frame 100, the Y-direction slide rail 202 is mounted on the X-direction slide rail 201 in a sliding manner along the X direction, a mounting seat is mounted on the Y-direction slide rail 202 in a sliding manner along the Y direction, and the Z-direction mounting rod 203 is mounted on the mounting seat in a manner that it can be lifted and lowered along the Z direction, and the spray gun 300 is mounted at the bottom end of the Z-direction mounting rod 203. By controlling the Z-direction lifting and lowering of the Z-direction mounting rod 203, the Y-direction movement of the mounting seat, and the X-direction sliding of the Y-direction slide rail 202, the spray gun 300 can be driven to move in the three directions of X, Y, and Z, so that the spray gun 300 can spray the object to be sprayed on the carrier 101.

[0053] In this embodiment, the three-dimensional moving mechanism 200 specifically adopts an X-direction slide rail 201, a Y-direction slide rail 202, a mounting seat and a Z-direction mounting rod 203. In other embodiments, it can also be a truss manipulator, a joint manipulator, etc., to achieve the movement and adjustment of the spray gun 300 in the three directions of XYZ. Specifically, the three directions of XYZ mentioned here are the front-back direction, the left-right direction and the up-down direction.

[0054] Continue to refer Figures 1 to 3 The spray gun 300 includes a gun barrel 1 and a cam column 2.

[0055] The gun barrel 1 is connected to the execution end of the three-dimensional moving mechanism 200, and the top of the gun barrel 1 is connected to a liquid inlet pipe 11, and the connection between the liquid inlet pipe 11 and the gun barrel 1 forms a liquid inlet, and the polyimide solution from the outside can be passed into the gun barrel 1 through the liquid inlet pipe 11 and the liquid inlet. An inner tube body 12 is rotatably mounted on the inner wall of the gun barrel 1, and a coaxial and rotatable filter cartridge 3 is provided on the inner side of the gun barrel 1, and the filter cartridge 3 is coaxially arranged on the inner side of the inner tube body 12, and an annular gap 4 exists between the circumference of the filter cartridge 3 and the inner tube body 12, and the top of the annular gap 4 is open and connected to the liquid inlet, and the bottom end of the filter cartridge 3 is integrally connected to the bottom end of the inner tube body 12 through an annular flange 5, and the flange 5 is used to close the bottom end of the annular gap 4 to prevent the polyimide solution in the annular gap 4 from continuing to flow downward; and when the inner tube body 12 rotates, the filter cartridge 3 can be driven to rotate synchronously through the flange 5. The barrel 1 is provided with a driver (not shown in the figure) for driving the inner tube body 12 to rotate. Specifically, the driver includes a driving motor and a gear. Fig. 9 A gear ring 121 is provided on the outer periphery of the inner tube body 12, and the driving motor is installed on the outer wall of the barrel 1. The gear is connected to the driving motor and meshes with the gear ring 121. When the driving motor drives the gear to rotate, the gear drives the gear ring 121 to rotate, and the gear ring 121 drives the inner tube body 12 to rotate, thereby controlling the rotation of the filter cartridge 3.

[0056] The top end of the filter cartridge 3 is closed and the bottom end is open, so as to prevent the polyimide solution passed into the gun barrel 1 from entering the filter cartridge 3 through the top end of the filter cartridge 3. That is to say, the closed top end of the filter cartridge 3 can disperse the polyimide solution into the annular gap 4. The circumferential wall of the filter cartridge 3 is evenly distributed with filter holes connected to the annular gap 4. The polyimide solution in the annular gap 4 can penetrate into the filter cartridge 3 through the filter holes. During the penetration process, the filter cartridge 3 filters the polyimide solution, so that impurities such as dust, metal chips, and solid particles in the polyimide solution are isolated on the outside of the filter cartridge 3 wall.

[0057] Continue to refer Figure 3 and Figure 4 A plurality of circumferentially evenly distributed side edges are fixed on the inner wall surface of the circumferential wall of the filter cartridge 3, a recoil push piece 31 is slidably mounted between two adjacent side edges, the sliding direction of the recoil push piece 31 is along the radial direction of the filter cartridge 3, and an interlayer cavity 311 is formed between each recoil push piece 31 and the circumferential wall of the filter cartridge 3, the interlayer cavity 311 is respectively connected with the filter hole and the bottom end opening of the filter cartridge 3, so that the solution filtered from the filter hole into the filter cartridge 3 flows to the bottom end opening of the filter cartridge 3 through the interlayer cavity 311.

[0058] The cam column 2 is concentrically placed in the filter cartridge 3 and connected to the gun barrel 1. The cam column 2 has a cam section on the inner side of the recoil push piece 31. The cam section has a protruding portion 24 for sequentially pushing each recoil push piece 31 outward when the filter cartridge 3 rotates relative to the cam column 2, so as to squeeze the solution in the interlayer cavity 311 to force part of the solution to flow out from the filter hole in the reverse direction to clean the filter cartridge 3. Thus, the polyimide solution can recoil the impurities attached to the outer wall of the filter cartridge 3, thereby keeping the filter holes of the filter cartridge 3 unobstructed and avoiding clogging by impurities, thereby reducing the replacement frequency of the filter cartridge 3 and the labor of the operator.

[0059] Continue to refer Figure 4 , Figure 5 and Figure 7 The bottom end of the cam column 2 is fixed with a closing plate 21 located in the bottom opening area of ​​the filter cartridge 3. The closing plate 21 includes a circular plate body 211 and an arc plate body 212. The circular plate body 211 is coaxial with the filter cartridge 3 and forms an annular groove 32 with the cylinder wall of the filter cartridge 3. The arc plate body 212 is arranged on the outer periphery of the circular plate body 211 and corresponds to the position of the raised portion 24 of the cam column 2 in the circumferential direction of the cam column 2. The arc plate body 212 closes a part of the annular groove 32. The arc plate body 212 is used to block the interlayer cavity 311 corresponding to the recoil pusher 31 when the raised portion 24 pushes the corresponding recoil pusher 31 to move outward. It should be noted that the arc center angle of the arc plate body 212 is substantially 180 degrees, which ensures that the arc plate body 212 has a larger closed area for the annular groove 32.

[0060] When the filter cartridge 3 drives the interlayer cavity 311 to rotate toward the protruding portion 24, the bottom of the interlayer cavity 311 will gradually be closed by the arc plate body 212, preventing the polyimide solution in the interlayer cavity 311 from flowing downward. In this way, when the recoil pusher 31 is pushed outward, the polyimide solution in the interlayer cavity 311 can only be recoiled to the outside through the filter hole of the filter cartridge 3, ensuring the uniqueness and stability of the flow of the polyimide solution in the interlayer cavity 311. When the interlayer cavity 311 gradually moves away from the protruding portion 24 during rotation, the bottom of the interlayer cavity 311 will gradually break away from the arc plate body 212 and remain unobstructed. In this way, the polyimide solution entering the interlayer cavity 311 can flow downward under its own weight. It is worth noting that at this time, the recoil pusher 31 will gradually move away from the circumferential wall of the filter cartridge 3 under the pressure of the polyimide solution, and the volume of the interlayer cavity 311 will gradually increase, which is just conducive to the passage of the polyimide solution. In summary, the bottom of the interlayer cavity 311 is closed when the volume is reduced, preventing the polyimide solution from flowing downward and ensuring the recoil effect of the polyimide solution on the filter holes of the filter cartridge 3; the bottom of the interlayer cavity 311 is opened when the volume is expanded, facilitating the polyimide solution therein to flow downward.

[0061] Continue to refer Figure 2 , Figure 3 and Figure 7The gun barrel 1 has a spray chamber 13 located below the flange 5, and the bottom end of the gun barrel 1 is provided with a nozzle 14 located below the spray chamber 13 and connected to the spray chamber 13, and the nozzle 14 is in the shape of a trumpet that diffuses outward. When the polyimide solution in the interlayer cavity 311 flows downward, it first enters the spray chamber 13 through the annular groove 32, and then sprays outward from the nozzle 14. The diffuse design of the nozzle 14 increases the spray range of the polyimide solution and improves the atomization effect.

[0062] During the spraying operation, the spray gun 300 has a pause time due to the replacement of the object to be sprayed and the rest of the staff. During the short pause time, it is necessary to prevent the polyimide solution in the spray gun 300 from condensing and precipitating.

[0063] To this end, a stirring member 51 extending into the spray chamber 13 is fixedly connected to the flange 5, and the number of stirring members 51 can be multiple and evenly distributed along the circumference of the filter cartridge 3. When the spraying work is suspended, the drive motor can still control the filter cartridge 3 to rotate, and the filter cartridge 3 controls the stirring member 51 to rotate through the flange 5. The stirring member 51 stirs the polyimide solution in the spray chamber 13 to prevent its condensation and precipitation, ensure its fluidization characteristics, and thus maintain its use effect.

[0064] Key References Figures 2 to 6 When the spraying operation is completed and the spray gun 300 is closed, there is still a lot of polyimide solution left in the filter cartridge 3, that is, in the interlayer cavity 311. If this part of the solution is not emptied, the polyimide solution is easy to solidify and coagulate over time, affecting the use of subsequent devices.

[0065] To this end, a plurality of inner push members 22 are slidably assembled on the cam column 2, and the sliding direction of the inner push members 22 is the radial direction of the filter cartridge 3. When sliding outward, the inner push members 22 can push the corresponding recoil push members 31 to move outward to the extreme position, that is, the outer surface of the recoil push member 31 is in contact with the circumferential wall of the filter cartridge 3, so that the volume in the interlayer cavity 311 approaches zero, so that the polyimide solution in the interlayer cavity 311 is emptied and processed, thereby avoiding the solidification and condensation of the polyimide solution in the interlayer cavity 311, and ensuring the sustainable use of the recoil push member 31; a driving component for driving the inner push member 22 to slide outward is provided on the barrel 1, so as to realize the automatic sliding of the inner push member 22.

[0066] It is worth noting that the number of the inner pusher 22 is one less than the number of the recoil pusher 31. For example, if the number of the recoil pusher 31 is six, the number of the inner pusher 22 is five. When the spraying operation is completed, the filter cartridge 3 is rotated to make one of the recoil pushers 31 be located at the position of the protruding portion 24, and the recoil pusher 31 is pushed to the limit position by the protruding portion 24, so that the protruding portion 24 replaces the pushing effect of the missing inner pusher 22, and the polyimide solution in the interlayer cavity 311 is emptied.

[0067] Key References Figure 7 After the polyimide solution is discharged from the interlayer cavity 311, it enters the outside of the filter cartridge 3, that is, the annular gap 4. In order to allow the polyimide solution to continue to flow out, an inner liquid outlet 122 is provided on the tube wall of the inner tube body 12, and an outer liquid outlet 15 corresponding to the inner liquid outlet 122 is provided on the tube wall of the gun barrel 1. Through the rotation of the inner tube body 12, the inner liquid outlet 122 and the outer liquid outlet 15 can be connected, thereby facilitating the polyimide solution to flow out of the annular gap 4 from the inner liquid outlet 122 and the outer liquid outlet 15, achieving the purpose of external discharge. Of course, a negative pressure suction device can also be added, which is connected to the outer liquid outlet 15 to suck the polyimide solution in the annular gap 4 to the outside.

[0068] Continue to refer Figures 2 to 6 The driving assembly includes a push rod 6 and a telescopic device 7. The push rod 6 is concentric with the cam column 2 and is vertically slidably inserted into the cam column 2. The bottom end of the push rod 6 forms a joint 61. The joint 61 is connected to each inner push member 22 through a transmission member. The transmission member includes a connecting rod 8. The two ends of the connecting rod 8 are respectively hinged to the joint 61 and the inner push member 22. When the push rod 6 moves downward, the connecting rod 8 can push the multiple inner push members 22 to slide outward, thereby realizing the outward movement of the recoil push member 31.

[0069] It should be noted that the gun barrel 1 is divided into a first pipe section 16, a sliding pipe section 17 and a second pipe section 18 from top to bottom. The first pipe section 16 and the second pipe section 18 are spaced apart, and the outer wall of the first pipe section 16 is fixedly connected to the outer wall of the second pipe section 18 by a connecting rod 161. The number of the connecting rods 161 can be multiple and are distributed at intervals along the circumference of the first pipe section 16 / the second pipe section 18. The first pipe section 16 and the second pipe section 18 constitute the basic part of the gun barrel 1. The sliding pipe section 17 is sandwiched between the first pipe section 16 and the second pipe section 18. The pipe walls on the upper and lower sides of the sliding pipe section 17 are relatively thin and are respectively slidably embedded in the pipe walls of the first pipe section 16 and the second pipe section 18, so that the sliding pipe section 17 can slide vertically, and during the sliding, the sliding pipe section 17 and the pipe walls on the upper and lower sides can maintain a closed state, that is, the sliding pipe section 17 still maintains a closed state to the interval area between the first pipe section 16 and the second pipe section 18 during the sliding, thereby preventing foreign impurities from entering the gun barrel 1 and preventing the polyimide solution in the gun barrel 1 from leaking. A clamp 62 is formed at the top of the push rod 6, and a connecting plate 171 is fixedly provided on the inner side of the sliding pipe section 17. The clamp 62 is fixedly embedded on the connecting plate 171. It is worth noting that a plurality of liquid holes 1711 for passing the polyimide solution are distributed on the connecting plate 171. The arrangement of the liquid holes 1711 ensures that the polyimide solution flows smoothly in the gun barrel 1 and avoids the formation of a blockage phenomenon.

[0070] The outer wall of the sliding pipe section 17 is provided with an ear plate, the telescope 7 is installed on the outer side of the second pipe section 18 and the telescopic end is connected to the ear plate. The telescope 7 can control the up and down sliding of the sliding pipe section 17 through the telescopic action, so that the sliding pipe section 17 transmits the power to the push rod 6 through the connecting plate 171 and the clamping head 62, thereby realizing the up and down sliding of the push rod 6.

[0071] Key References Figure 7 and Figure 8 The bottom end of the recoil pusher 31 is fixed with a plugging plate 312. When the recoil pusher 31 moves outward to the limit position, that is, when the recoil pusher 31 is in contact with the wall of the filter cartridge 3, the plugging plate 312 slides to the position of the annular groove 32, and the plugging plate 312 blocks another part of the annular groove 32. In other words, the area of ​​the annular groove 32 that is not closed by the arc plate body 212 is blocked by the plugging plate 312 at this time. In this way, under the sealing effect of the plugging plate 312 and the arc plate body 212, the internal space of the filter cartridge 3 is isolated from the spray chamber 13, so that the spray chamber 13 can be processed separately.

[0072] A cleaning agent inlet 181 and a cleaning agent outlet 182 are provided on the tube wall of the gun barrel 1, and the cleaning agent inlet 181 and the cleaning agent outlet 182 are opposite to each other in the radial direction of the gun barrel 1 and are both connected to the liquid spray chamber 13. When the spraying operation is completely completed and the spray gun 300 is in an idle state, it is necessary to clean the liquid spray chamber 13 and the nozzle 14 to prevent the polyimide solution from remaining and forming precipitation, thereby causing the phenomenon of blockage and accumulation. At this time, external clean water or cleaning agent can be introduced through the cleaning agent inlet 181, and after flowing through the liquid spray chamber 13 and the nozzle 14, the clean water or cleaning agent is discharged from the cleaning agent outlet 182, thereby carrying out the residual polyimide solution at the liquid spray chamber 13 and the nozzle 14, realizing the cleaning of the liquid spray chamber 13 and the nozzle 14, thereby avoiding the phenomenon of precipitation and blockage at the liquid spray chamber 13 and the nozzle 14.

[0073] It can be understood that the cleaning agent inlet 181, the cleaning agent outlet 182 and the outgoing liquid port 15 are all threaded with detachable threaded plugs. During spraying, the cleaning agent inlet 181, the cleaning agent outlet 182 and the outgoing liquid port 15 are all blocked by the threaded plugs to prevent the outflow of the polyimide solution in the barrel 1; during drainage and cleaning, the threaded plugs on the three can be removed for easy drainage and cleaning.

[0074] refer to Figures 1 to 9 , the working principle of the spraying device of the present invention is as follows:

[0075] First, solution filtration, the external device pumps the polyimide solution into the barrel 1 through the liquid inlet pipe 11, the polyimide solution flows into the annular gap 4, and then penetrates into the filter cartridge 3 through the filter holes on the circumferential wall of the filter cartridge 3, then flows into the interlayer cavity 311, and is sprayed out through the annular groove 32, the spray chamber 13, and the nozzle 14 to achieve spraying of the object to be sprayed. In this process, the filter holes of the filter cartridge 3 filter the polyimide solution and improve the purity of the polyimide solution. The filtered impurities adhere to the outer wall of the filter cartridge 3.

[0076] Second, the recoil prevention, the driving motor controls the filter cartridge 3 to rotate, and the filter cartridge 3 drives the multiple recoil pushers 31 to revolve. Under the liquid pressure of the polyimide solution, the recoil pushers 31 will press against the outer contour surface of the cam column 2 and revolve along the outer contour surface of the cam column 2. When the recoil pusher 31 approaches the protrusion 24, the recoil pusher 31 will be moved outward by the protrusion 24, so that the recoil pusher 31 can push the polyimide solution in the interlayer cavity 311 out of the filter cartridge 3 in the reverse direction, so that the polyimide solution can recoil the impurities attached to the outer wall of the filter cartridge 3, thereby keeping the filter holes of the filter cartridge 3 unobstructed and preventing them from being blocked by impurities, reducing the replacement frequency of the filter cartridge 3 and reducing the operator's workload.

[0077] Third, when stirring is temporarily stopped, when the spraying operation is temporarily stopped, the driving motor can still control the filter cartridge 3 to rotate. The filter cartridge 3 controls the rotation of the stirring member 51 through the flange 5. The stirring member 51 stirs the polyimide solution in the spray chamber 13 to prevent it from condensing and precipitating, thereby ensuring its fluidized characteristics and maintaining its use effect.

[0078] Fourth, shutdown treatment, after the spraying operation is completed, when the inner pusher 22 pushes the recoil pusher 31 to move outward to the limit position, the outer surface of the recoil pusher 31 fits with the circumferential wall of the filter cartridge 3, thereby making the volume of the interlayer cavity 311 approach zero, realizing the emptying treatment of the polyimide solution in the interlayer cavity 311, avoiding the solidification and condensation of the polyimide solution in the interlayer cavity 311, and ensuring the sustainable use of the recoil pusher 31. After the polyimide solution is discharged from the interlayer cavity 311, it enters the annular gap 4, and then flows out of the annular gap 4 through the inner liquid outlet 122 and the outer liquid outlet 15, achieving the purpose of external discharge.

[0079] In addition, clean water or cleaning agent from the outside can be introduced through the cleaning agent inlet 181, and after flowing through the spray chamber 13 and the nozzle 14, the clean water or cleaning agent is discharged from the cleaning agent outlet 182, thereby carrying out the residual polyimide solution in the spray chamber 13 and the nozzle 14, thereby cleaning the spray chamber 13 and the nozzle 14, thereby avoiding the formation of precipitation blockage in the spray chamber 13 and the nozzle 14.

[0080] It should be noted that during spraying, the cleaning agent inlet 181, the cleaning agent outlet 182, and the outflow port 15 can all be blocked by threaded plugs to prevent the outflow of the polyimide solution in the barrel 1; during drainage and cleaning, the threaded plugs on the three can be removed to facilitate drainage and cleaning.

[0081] It can be understood that the spraying device in this embodiment is not limited to the application of polyimide solution, but can also be applied to other coatings in industry and life, such as paint.

[0082] In this embodiment, the top of the cam column 2 has a main shaft portion 23, which is rotatably connected to the top of the filter cartridge 3, and the push rod 6 is vertically slidably connected to the cam column 2. Therefore, when the filter cartridge 3 rotates, the cam column 2 is restricted by the push rod 6 and cannot rotate, thereby realizing relative rotation with the filter cartridge 3; when the push rod 6 moves up and down, the cam column 2 is restricted by the filter cartridge 3 and cannot move, thereby realizing relative movement with the push rod 6. In other words, the cam column 2 is indirectly connected to the gun barrel 1 through the two-way restriction of the filter cartridge 3 and the push rod 6.

[0083] In this embodiment, the outer surface of the recoil push piece 31 can be a curved surface so as to fit with the wall of the filter cartridge 3 .

[0084] In the present embodiment, the stirring element 51 is usually in the shape of a rod, a strip, etc. Of course, the plurality of stirring elements 51 may be replaced with stirring blades.

[0085] In this embodiment, the transmission member can also be a wedge-shaped structure, specifically, it can be a wedge-shaped block separately arranged on the push rod 6 and the inner push member 22. When the push rod 6 moves downward, the wedge-shaped block on it can squeeze the wedge block on the inner push member 22, so that the inner push member 22 moves outward.

[0086] In this embodiment, the telescopic device 7 can be a hydraulic rod, a pneumatic telescopic rod, an electric push rod, a telescopic motor, etc.

[0087] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0088] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0089] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A spraying device, comprising a frame, on which a spray gun for spraying an object to be sprayed is mounted, characterized in that: The spray gun comprises: A gun barrel, wherein the top of the gun barrel is provided with a liquid inlet for introducing a polyimide solution, and a coaxial and rotatable filter cartridge is arranged in the gun barrel, the top of the filter cartridge is closed and the bottom is open, and a filter hole connected with the liquid inlet is arranged on the circumferential wall of the filter cartridge; a recoil push piece is mounted on the inner wall surface of the circumferential wall for radial sliding movement along the filter cartridge, and a plurality of recoil push pieces are distributed at intervals along the circumferential direction, and an interlayer cavity is formed between each recoil push piece and the circumferential wall, and the interlayer cavity is connected with the filter hole and the bottom opening of the filter cartridge, so that the solution filtered from the filter hole and entering the filter cartridge flows to the bottom opening of the filter cartridge through the interlayer cavity; A cam column, wherein the cam column is concentrically disposed in the filter cartridge and connected to the gun barrel, the cam column having a cam section located on the inner side of the recoil push piece, the cam section having a raised portion for sequentially pushing each recoil push piece outward when the filter cartridge and the cam column rotate relative to each other, so as to squeeze the solution in the interlayer cavity and force part of the solution to flow out from the filter hole in the reverse direction to clean the filter cartridge; the bottom end of the gun barrel is provided with a nozzle communicating with the bottom end opening of the filter cartridge.

2. The spraying device according to claim 1, characterized in that: A closing plate for closing the bottom opening area of ​​the filter cartridge is provided at the bottom end of the cam column, and the closing plate corresponds to the position of the raised portion of the cam column in the circumferential direction of the cam column, so as to block the interlayer cavity corresponding to the recoil push piece when the raised portion pushes the corresponding recoil push piece to move outward.

3. The spraying device according to claim 2, characterized in that: At least two inner pushers are mounted on the cam column for radial sliding along the filter cartridge. When sliding outward, the inner pushers can push the corresponding recoil pushers to move outward to the extreme position so that the solution in the interlayer cavity can be emptied. A driving assembly for driving the inner pushers to slide outward is provided on the gun barrel.

4. The spraying device according to claim 3, characterized in that: The driving assembly includes a push rod and a telescope. The push rod is vertically inserted into the cam column and can slide up and down. The push rod is connected to the inner push member through a transmission member so that when the push rod moves downward, it can push the inner push member to slide outward. The telescope is installed on the gun barrel and connected to the push rod to drive the push rod to slide up and down.

5. The spraying device according to claim 4, characterized in that: The transmission member comprises a connecting rod, and two ends of the connecting rod are respectively hinged to the pushing rod and the inner pushing member.

6. The spraying device according to claim 4, characterized in that: The gun barrel is divided into a first pipe section, a sliding pipe section and a second pipe section from top to bottom. The first pipe section and the second pipe section are connected by a connecting rod. The sliding pipe section is clamped between the first pipe section and the second pipe section and can slide up and down. During sliding, the sliding pipe section keeps the interval area between the first pipe section and the second pipe section closed; the sliding pipe section is connected to the top end of the push rod; the telescope is installed on the outside of the second pipe section and connected to the sliding pipe section.

7. The spraying device according to claim 1, characterized in that: An inner tube body is rotatably mounted on the inner wall of the gun barrel, and the inner tube body is sleeved on the outer peripheral side of the filter cartridge, and an annular gap is formed between the two, the top end of the annular gap is open and the bottom end is closed, and the annular gap is respectively connected to the liquid inlet and the filter hole; The gun barrel is provided with a liquid spray chamber, the liquid spray chamber is located below the annular gap and above the nozzle, the filter cartridge is connected with a stirring member, and the stirring member extends into the liquid spray chamber.

8. The spraying device according to claim 3, characterized in that: The closing plate includes a circular plate body and an arc plate body, an annular groove is formed between the circular plate body and the cylinder wall of the filter cartridge, the arc plate body is arranged on the outer periphery of the circular plate body, and corresponds to the position of the raised portion of the cam column in the circumferential direction of the cam column, the arc plate body closes a portion of the annular groove, and a blocking plate is provided at the bottom end of the recoil push piece, the blocking plate is used to block the area of ​​the annular groove that is not closed by the arc plate body when the recoil push piece moves outward to the extreme position.

9. The spraying device according to claim 7, characterized in that: The inner tube body is provided with an inner liquid outlet, the gun barrel is provided with an outer liquid outlet corresponding to the inner liquid outlet, and the outer liquid outlet and the inner liquid outlet are connectable; the gun barrel is provided with a cleaning agent inlet and a cleaning agent outlet connected with the liquid spraying chamber, and the outer liquid outlet, the cleaning agent inlet and the cleaning agent outlet are all equipped with detachable threaded plugs.

10. The spraying device according to claim 7, characterized in that: A driver for driving the inner tube body to rotate is installed on the gun barrel.

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