A high-efficiency electrostatic coating equipment for rod-shaped workpieces

Abstract

This invention belongs to the field of electrostatic coating equipment, and particularly relates to a high-efficiency electrostatic coating equipment for rod-shaped workpieces. It includes a spray booth and a guide rail passing through the spray booth. Rod-shaped workpieces are suspended on the guide rail. At least one set of electrostatic spraying mechanisms is installed inside the spray booth. Each electrostatic spraying mechanism includes a liquid paint tank, a spray frame, a paint receiving frame, a paint recovery tank, and a fan. The spray frame is mounted on the liquid paint tank and has several nozzles installed inside, with the nozzles facing rearward. The paint recovery tank is located behind the paint receiving frame, and its upper end is connected to both the paint receiving frame and the fan via pipes. A spray baffle is installed inside the spray booth between the paint receiving frame and the paint recovery tank. With the cooperation of the nozzles and the spray baffle, the atomized paint is always maintained in the spraying area directly below the guide rail for the rod-shaped workpiece to pass through, increasing the contact time between the paint and the rod-shaped workpiece and thus improving the spraying quality.

Description

Technical Field

[0001] This invention belongs to the field of electrostatic coating equipment, and particularly relates to a high-efficiency electrostatic coating equipment for rod-shaped workpieces. Background Technology

[0002] Electrostatic spraying equipment uses the principle of electrostatic attraction to make the sprayed mist coating negatively charged and the workpiece positively charged. The mist coating adheres to the workpiece surface along the electric field lines, providing better coverage for curved or irregular surfaces.

[0003] Traditional vertical electrostatic spraying equipment still has the drawback of not being able to spray both the front and back sides of a workpiece simultaneously. It requires rotating the workpiece 180 degrees or setting up two sets of nozzles to achieve the function of spraying both sides. If the workpiece is flipped, the volume of the spraying box needs to be increased, and the nozzles need to be far away from the workpiece to allow space for the workpiece to rotate. If two sets of nozzles are used, there is a drawback that the atomized paint sprayed by the two sets of nozzles collide with each other, preventing the paint from adhering to the workpiece. Summary of the Invention

[0004] To achieve the above objectives, the present invention employs the following technical solutions:

[0005] A high-efficiency electrostatic coating equipment for rod-shaped workpieces includes a spray booth and a guide rail passing through the spray booth. Rod-shaped workpieces are suspended on the guide rail. At least one set of electrostatic spraying mechanisms is installed inside the spray booth. Each electrostatic spraying mechanism includes a liquid paint tank, a spray frame, a paint receiving frame, a paint recovery tank, and a fan. The spray frame is mounted on the liquid paint tank and contains several nozzles with their nozzles facing rearward. The paint receiving frame is located behind the liquid paint tank, and the paint recovery tank is located behind the paint receiving frame. The upper end of the paint recovery tank is connected to the paint receiving frame and the fan via pipes. A spray baffle is installed inside the spray booth between the paint receiving frame and the paint recovery tank. The nozzles are inclined downwards. Pressurized pipes connected to the liquid paint tank and each nozzle are installed inside the spray frame. The upper part of the paint recovery tank is cylindrical, and the lower part is an inverted cone.

[0006] As a preferred embodiment, the lower end of the paint recycling bin is connected to a base and a support platform set inside the base. A crushing rod extending into the paint recycling bin is installed on the support platform. A slot is provided at the upper end of the support platform, and a locking block extending into the slot is provided at the lower end of the crushing rod. A support plate is slidably installed inside the support platform, abutting against the lower end of the crushing rod. A support spring is provided between the lower end of the support plate and the inner wall of the support platform. When the crushing rod moves downward in the support platform, the locking block can disengage from the slot.

[0007] As a preferred embodiment, the upper end of the crushing rod is provided with several telescopic frames that are inclined along the central axis of the crushing rod. A crushing blade is slidably arranged inside the telescopic frame. The outer end of the crushing blade is provided with a triangular groove. A telescopic spring is provided between the inner end of the crushing blade and the inner wall of the telescopic frame.

[0008] As a preferred embodiment, a funnel-shaped collection trough is provided inside the paint receiving rack, and a pipe extending from the paint recycling box is connected to the collection trough.

[0009] As a preferred option, the front end of the spray baffle is an arc shape that is narrower at the top and wider at the bottom. The spray baffle is provided with several exhaust ports that correspond to the front and rear directions of the spray head. The exhaust ports are inclined upwards, and the fan is connected to the ventilation cavity inside the spray baffle through a pipe.

[0010] As a preferred embodiment, a sieving box is installed inside the spray booth, which is connected to the liquid paint tank and the base respectively. A sieve plate is rotatably connected to the rear end of the sieving box. A return spring is provided between the upper end of the sieve plate and the inner wall of the sieving box. A collision platform is provided at the upper end of the sieving box, and several circular protrusions are provided at the lower end of the collision platform. When the sieve plate swings upward, the sieve plate can contact the collision platform.

[0011] As a preferred embodiment, waste discharge outlets and baffles slidably installed at the waste discharge outlets are provided on both the left and right sides of the front end of the screening box. An electric motor and a gear connected to the electric motor are installed on the upper end of the screening box. Racks that mesh with the gears are respectively provided on the upper ends of the left and right baffles, and the left and right racks are respectively placed on the front and rear sides of the gears.

[0012] As a preferred embodiment, a conveyor belt and several sliders connected to the conveyor belt are installed inside the guide rail. A connecting rod extending to the lower side of the guide rail is provided at the lower end of the slider. A suspension frame is rotatably connected to the lower end of the connecting rod. A workpiece support frame and several rod-shaped workpieces fixed in the workpiece support frame are suspended at the lower end of the suspension frame.

[0013] Compared with existing technologies, the advantages of this invention are:

[0014] 1. The downwardly tilted nozzle of this invention sprays a mist of paint that can expand the coverage area, while the airflow from the upwardly tilted exhaust port causes the mist of paint passing through the rod-shaped workpiece to move forward again, allowing the mist of paint to cover the rear end area of ​​the workpiece. Without additional nozzles or rotating the rod-shaped workpiece, the effect of uniformly spraying both sides of the rod-shaped workpiece is achieved. In addition, with the cooperation of the nozzle and exhaust port, the mist of paint is always maintained in the spraying area directly below the guide rail for the rod-shaped workpiece to pass through, and only slowly sinks, increasing the contact time between the paint and the rod-shaped workpiece, thereby improving the spraying quality.

[0015] 2. The fan designed in this invention causes the sinking mist coating to enter the coating recovery tank along the tangential direction. Under the action of centrifugal force, the mist coating separates from the airflow and rotates and sinks to re-aggregate into liquid coating. This allows the collected liquid coating to be transported back into the liquid coating tank in a timely manner, avoiding the coating from hardening and becoming unrecoverable for the spraying process due to excessive time, thus improving the utilization rate of coating. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the interior of the spray booth of the present invention.

[0018] Figure 3 This is a schematic diagram showing the positional relationship between the spraying frame and the spraying baffle of the present invention.

[0019] Figure 4 This is a schematic diagram of the spraying baffle rear device of the present invention.

[0020] Figure 5 This is a schematic diagram of the connection relationship between the rod-shaped workpiece and the guide rail according to the present invention.

[0021] Figure 6 This is a schematic diagram showing the positional relationship between the spraying rack, paint receiving rack, and paint recycling bin of the present invention.

[0022] Figure 7 This is a schematic diagram showing the positional relationship between the liquid coating tank, the screening tank, and the coating recovery tank of the present invention.

[0023] Figure 8 This is a schematic diagram of the interior of the paint recycling bin of the present invention.

[0024] Figure 9 This is a schematic diagram of the interior of the sieving box of the present invention.

[0025] Figure 10 This is a schematic diagram of the waste material being cleaned by the screening box of the present invention.

[0026] The following are the labels in the diagram: 1. Spray booth; 2. Guide rail; 3. Liquid paint tank; 4. Spraying frame; 5. Spray nozzle; 6. Paint receiving frame; 7. Paint recycling box; 8. Fan; 9. Spraying baffle; 10. Rod-shaped workpiece; 20. Base; 21. Support platform; 22. Crushing rod; 23. Clamping block; 24. Support plate; 25. Support spring; 26. Telescopic frame; 27. Crushing blade; 28. Telescopic spring; 29. ​​Slot; 31. Collection tank; 32. Pressurized pipeline; 33. Exhaust outlet; 40. Screening box; 41. Screen plate; 42. Return spring; 43. Collision platform; 44. Protrusion; 45. Baffle; 46. Motor; 47. Gear; 48. Rack; 50. Conveyor belt; 51. Slider; 52. Connecting rod; 53. Suspension frame; 54. Workpiece support frame. Detailed Implementation

[0027] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following embodiments and drawings are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0028] A high-efficiency electrostatic coating equipment for rod-shaped workpieces, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the system includes a spray booth 1 and a guide rail 2 passing through the spray booth 1. A rod-shaped workpiece 10 is suspended on the guide rail 2. At least one set of electrostatic spraying mechanism is installed inside the spray booth 1. The electrostatic spraying mechanism includes a liquid paint tank 3, a spray frame 4, a paint receiving frame 6, a paint recovery box 7, and a fan 8. The spray frame 4 is installed on the liquid paint tank 3 and has several nozzles 5 installed inside it. The nozzles of the nozzles are arranged facing the rear side. The paint receiving frame 6 is located behind the liquid paint tank 3. The paint recovery box 7 is located behind the paint receiving frame 6 and its upper end is connected to the paint receiving frame 6 and the fan 8 respectively by means of pipes. A spray baffle 9 is installed inside the spray booth 1 between the paint receiving frame 6 and the paint recovery box 7.

[0029] The upper part of the paint recycling box 7 is cylindrical, and the lower part of the paint recycling box 7 is an inverted cone. The pipe connecting the paint recycling box 7 and the paint receiving frame 6 is set along the tangent of the inner cavity of the paint recycling box 7. The pipe connecting the paint recycling box 7 and the fan 8 is located at the top of the paint recycling box 7.

[0030] like Figure 5 As shown, a conveyor belt 50 and several sliders 51 connected to the conveyor belt 50 are installed inside the guide rail 2. A connecting rod 52 extending to the lower side of the guide rail 2 is provided at the lower end of the slider 51. A suspension frame 53 is rotatably connected to the lower end of the connecting rod 52. A workpiece support frame 54 and six rod-shaped workpieces 10 fixed in the workpiece support frame 54 are suspended at the lower end of the suspension frame 53.

[0031] like Figure 6As shown, a funnel-shaped collection trough 31 is provided inside the paint receiving rack 6, and the pipe extending from the paint recycling box 7 is connected to the collection trough 31.

[0032] like Figure 3 and Figure 7 As shown, the nozzle 5 is tilted downwards, and the spray frame 4 is equipped with pressurized pipes 32 that are connected to the liquid paint tank 3 and each nozzle 5 respectively. The front end of the spray baffle 9 is an arc shape that is narrow at the top and wide at the bottom. The spray baffle 9 is provided with four exhaust ports 33 that correspond to the front and rear directions of the nozzle 5. The exhaust ports 33 are tilted upwards, and the fan 8 is connected to the ventilation cavity inside the spray baffle 9 through a pipe.

[0033] The nozzle 5 sprays a negatively charged mist of paint in a downward-sloping rear direction, and the exhaust port 33 discharges air in a forward-sloping upward direction, so that the mist of paint is always maintained in the spraying area directly below the guide rail 2 for the rod-shaped workpiece 10 to pass through. The rod-shaped workpiece 10 is grounded and positively charged through the guide rail 2. The mist of paint sinks into the collection tank 31 of the paint receiving frame 6, and is finally sucked into the paint recovery box 7 by the fan 8 for recycling.

[0034] like Figure 6 , Figure 7 and Figure 8 As shown, the lower end of the paint recycling bin 7 is connected to a base 20 and a support platform 21 disposed inside the base 20. A breaking rod 22 extending into the paint recycling bin 7 is installed on the support platform 21. A slot 29 is provided at the upper end of the support platform 21. A locking block 23 extending into the slot 29 is provided at the lower end of the breaking rod 22. A support plate 24 is slidably disposed inside the support platform 21 and abuts against the lower end of the breaking rod 22. A support spring 25 is provided between the lower end of the support plate 24 and the inner wall of the support platform 21. When the breaking rod 22 moves downward in the support platform 21, the locking block 23 can disengage from the slot 29.

[0035] like Figure 8 As shown, the upper end of the crushing rod 22 is provided with six telescopic frames 26 that are inclined along the central axis of the crushing rod 22. The crushing blades 27 are slidably arranged inside the telescopic frames 26. The outer end of the crushing blades 27 is provided with a triangular groove. The inner end of the crushing blades 27 is provided with a telescopic spring 28 between it and the inner wall of the telescopic frame 26. When the crushing rod 22 is rotating, the crushing blades 27 can overcome the action of the telescopic springs 28 under the action of centrifugal force and move outward from the telescopic frame 26 and contact the inner wall of the paint recovery box 7.

[0036] like Figure 7 , Figure 9 and Figure 10As shown, a sieving box 40 is installed in the spray booth 1, which is connected to the liquid paint tank 3 and the base 20 respectively. A sieve plate 41 is rotatably connected to the rear end of the sieving box 40. A return spring 42 is provided between the upper end of the sieve plate 41 and the inner wall of the sieving box 40. A collision platform 43 is provided at the upper end of the sieving box 40, and multiple circular protrusions 44 are provided at the lower end of the collision platform 43. When the sieve plate 41 swings upward, the sieve plate 41 can contact the collision platform 43.

[0037] Waste discharge outlets 49 and baffles 45 slidably installed at the waste discharge outlets 49 are provided on the left and right sides of the front end of the screening box 40. The outer end of the baffle 45 is provided with an inclined surface. The upper end of the screening box 40 is equipped with a motor 46 and a gear 47 that is powered by the motor 46. The upper ends of the left and right baffles 45 are respectively provided with racks 48 that mesh with the gears 47. The left and right racks 48 are respectively placed on the front and rear sides of the gears 47.

[0038] The misty paint entering the paint recycling tank 7 gathers into liquid and flows back to the liquid paint tank 3 through the base 20 and the sieve box 40. A one-way valve is installed at the connection between the liquid paint tank 3 and the sieve box 40. The sieve plate 41 prevents solidified paint fragments from entering the liquid paint tank 3.

[0039] Working principle:

[0040] The airflow generated by the forward rotation of the blower 8 enters the paint recovery box 7 from the paint receiving frame 6 and is discharged directly through the upper pipe of the paint recovery box 7. The misty paint that enters the paint recovery box 7 with the airflow rotates along the inner wall of the paint recovery box 7 and separates from the airflow under the action of centrifugal force. It rotates and sinks along the conical inner wall at the lower end of the paint recovery box 7. During this process, the misty paint re-aggregates into liquid paint. The liquid paint is finally returned to the liquid paint box 3 through the screening box 40.

[0041] After the equipment stops spraying, it is necessary to clean the residual liquid paint in the paint recovery box 7, base 20 and screening box 40. Control the fan 8 to reverse, and generate an airflow from top to bottom in the paint recovery box 7. The airflow passes through the base 20 and enters the screening box 40. The airflow exerts a force on the upper end of the inclined telescopic frame 26, which not only drives the crushing rod 22 to overcome the elastic force of the support spring 25 and move downward, so that the locking block 23 is disengaged from the locking slot 29, but also drives the crushing rod 22 to rotate after the locking block 23 is disengaged from the locking slot 29. Under the action of centrifugal force, the crushing blade 27 overcomes the action of the telescopic spring 28 and moves towards the outside of the telescopic frame 26 and contacts the inner wall of the paint recovery box 7. The crushing blade 27 scrapes off the liquid paint and crushed solidified paint adhering to the inner wall of the paint recovery box 7.

[0042] In addition, the motor 46 is controlled to rotate forward and, with the cooperation of gear 47 and rack 48, the two baffles 45 on the left and right move towards the inside of the screening box 40. The two baffles 45 block the channel between the liquid paint box 3 and open the waste discharge port 49. Under the action of airflow, the baffles 45 repeatedly overcome the return spring 42 and swing upward and collide with the collision platform 43 before falling down. Therefore, the residual liquid paint and solidified paint fragments are discharged through the waste discharge port 49 with the airflow.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A high-efficiency electrostatic coating equipment for rod-shaped workpieces, comprising a spray booth (1) and a guide rail (2) passing through the spray booth (1), wherein a rod-shaped workpiece (10) is suspended on the guide rail (2), and at least one set of electrostatic spraying mechanisms is installed inside the spray booth (1). The electrostatic spraying mechanism includes a liquid paint tank (3), a spray frame (4), a paint receiving frame (6), a paint recycling tank (7), and a fan (8). The spray frame (4) is installed on the liquid paint tank (3) and has several nozzles (5) installed inside, with the nozzles of the nozzles facing the rear. The paint receiving frame (6) is located on the liquid paint tank. Behind the box (3), the paint recycling box (7) is located behind the paint receiving frame (6), and the upper end of the paint recycling box (7) is connected to the paint receiving frame (6) and the fan (8) respectively by pipes. The spray booth (1) is equipped with a spray baffle (9) located between the paint receiving frame (6) and the paint recycling box (7). The nozzles (5) are tilted downwards. The spray frame (4) is equipped with pressurized pipes (32) that are connected to the liquid paint box (3) and each nozzle (5) respectively. The upper part of the paint recycling box (7) is cylindrical, and the lower part of the paint recycling box (7) is an inverted cone. The lower end of the paint recycling bin (7) is connected to a base (20) and a support platform (21) set inside the base (20). A breaking rod (22) extending into the paint recycling bin (7) is installed on the support platform (21). A slot (29) is provided at the upper end of the support platform (21). A locking block (23) extending into the slot (29) is provided at the lower end of the breaking rod (22). A support plate (24) that abuts against the lower end of the breaking rod (22) is slidably provided inside the support platform (21). A support spring (25) is provided between the lower end of the support plate (24) and the inner wall of the support platform (21). When the breaking rod (22) moves downward in the support platform (21), the locking block (23) can disengage from the slot (29). The upper end of the crushing rod (22) is provided with several telescopic frames (26) that are inclined along the central axis of the crushing rod (22). A crushing blade (27) is slidably arranged inside the telescopic frame (26). A triangular groove is provided at the outer end of the crushing blade (27). A telescopic spring (28) is provided between the inner end of the crushing blade (27) and the inner wall of the telescopic frame (26). After the equipment stops spraying, it is necessary to clean the residual liquid paint in the paint recovery box (7), control the fan (8) to reverse, and generate airflow from top to bottom in the paint recovery box (7). The airflow exerts a force on the upper end face of the inclined telescopic frame (26), which can not only drive the crushing rod (22) to overcome the elastic force of the support spring (25) and move downward, so that the locking block (23) is disengaged from the slot (29), but also drive the crushing rod (22) to rotate after the locking block (23) is disengaged from the slot (29). Under the action of centrifugal force, the crushing blade (27) overcomes the action of the telescopic spring (28) and moves towards the outside of the telescopic frame (26) and contacts the inner wall of the paint recovery box (7). The crushing blade (27) scrapes off the liquid paint and the crushed solidified paint adhering to the inner wall of the paint recovery box (7).

2. The high-efficiency electrostatic coating equipment for rod-shaped workpieces according to claim 1, characterized in that: The paint receiving frame (6) is provided with a funnel-shaped collection trough (31), and the pipe extending from the paint recycling box (7) is connected to the collection trough (31).

3. The high-efficiency electrostatic coating equipment for rod-shaped workpieces according to claim 1, characterized in that: The front end of the spray baffle (9) is an arc shape that is narrow at the top and wide at the bottom. The spray baffle (9) is provided with several exhaust ports (33) corresponding to the front and rear directions of the nozzle (5). The exhaust ports (33) are inclined upwards. The fan (8) is connected to the ventilation cavity inside the spray baffle (9) through a pipe.

4. The high-efficiency electrostatic coating equipment for rod-shaped workpieces according to claim 1, characterized in that: The spray booth (1) is equipped with a sieving box (40) that is connected to the liquid paint tank (3) and the base (20) respectively. The rear end of the sieving box (40) is rotatably connected to a sieve plate (41). A reset spring (42) is provided between the upper end of the sieve plate (41) and the inner wall of the sieving box (40). A collision platform (43) is provided at the upper end of the sieving box (40), and several circular protrusions (44) are provided at the lower end of the collision platform (43). When the sieve plate (41) swings upward, the sieve plate (41) can contact the collision platform (43).

5. The high-efficiency electrostatic coating equipment for rod-shaped workpieces according to claim 4, characterized in that: The screening box (40) is provided with waste discharge outlets (49) and baffles (45) slidably installed at the waste discharge outlets (49) on both the left and right sides of the front end. The screening box (40) is equipped with an electric motor (46) and a gear (47) that is powered by the electric motor (46). The upper ends of the two baffles (45) are respectively provided with racks (48) that mesh with the gears (47). The two racks (48) are respectively placed on the front and rear sides of the gears (47).

6. The high-efficiency electrostatic coating equipment for rod-shaped workpieces according to claim 1, characterized in that: The guide rail (2) is equipped with a conveyor belt (50) and a number of sliders (51) connected to the conveyor belt (50). The lower end of the slider (51) is provided with a connecting rod (52) extending to the lower side of the guide rail (2). The lower end of the connecting rod (52) is rotatably connected to a suspension frame (53). The lower end of the suspension frame (53) is suspended by a workpiece support frame (54) and a number of rod-shaped workpieces (10) fixed in the workpiece support frame (54).

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