A powder recovery device for electrostatic spray line

Abstract

The application discloses a powder recovery device for electrostatic spraying assembly line, and belongs to the technical field of powder recovery. The opening and closing mechanism is arranged, the powder guide hopper is rotated, the second universal joint is driven to rotate through the mounting seat, the first universal joint is driven to rotate through the connecting rod, the first universal joint drives the rotating ring to rotate, the shutter is driven to rotate to the position corresponding to the through hole, the through hole blocks the gas channel at this time, the separation cavity stops inhaling the powder-containing airflow, the number of parallel gas channels is reduced, the air volume is redistributed and concentrated to the separation cavity with the open gas channel, the cross-sectional flow and the flow rate at the inlet of the separation cavity are increased, the centrifugal acceleration is increased, the same fine powder separation effect as frequency conversion speed-up is obtained under the condition that the total air volume is unchanged, and the energy-saving advantage of constant total power consumption is achieved.

Description

Technical Field

[0001] This invention relates to the field of powder recycling technology, and in particular to a powder recycling device for an electrostatic spraying production line. Background Technology

[0002] In electrostatic spraying production lines, cyclone separators, as the primary coarse separation unit of the powder recovery system, undertake the core function of separating the oversprayed powder carried in the micro-negative pressure airflow of the spray booth into solid and gas phases through centrifugal force. The type of powder has a significant impact on the cyclone recovery effect of electrostatic spraying. The particle size distribution, flowability, density and other characteristics of the powder will affect the actual collection efficiency and powder discharge smoothness of the cyclone separator, and ultimately affect the recovery rate and production line stability. In existing technologies, different powder systems are generally adapted by adjusting the wind speed. The inlet wind speed of the cyclone separator is adjusted by a variable frequency fan. When separating coarse powder, the inlet wind speed and centrifugal force are moderate. When separating fine powder, the inlet wind speed is increased to enhance the centrifugal force and improve the fine powder collection rate, thereby adapting to difficult-to-collect systems such as low-density powder, fine powder, and metallic powder. Since variable frequency speed regulation adjusts air volume by changing the fan speed, the impeller kinetic energy increases significantly as the speed increases. If high-speed operation is maintained for a long time, the current surge will exceed the inverter's tolerance range, easily triggering overvoltage stall and causing the protection to trip. At this time, the fan is forced to reduce its speed. As the speed decreases and the air speed slows down, the centrifugal separation effect of the cyclone separator decreases, and fine powder escapes, resulting in a reduced recovery rate. Therefore, variable frequency speed regulation cannot guarantee both safety and efficiency under this operating condition. Summary of the Invention

[0003] The purpose of this invention is to address the problem that as the rotational speed increases, the impeller's kinetic energy increases significantly. If high-speed operation is maintained for a long time, the current surge exceeds the inverter's tolerance range, easily triggering overvoltage stall and causing the protection circuit breaker to trip. At this time, the fan is forced to reduce its speed. As the rotational speed decreases and the wind speed slows down, the centrifugal separation effect of the cyclone separator decreases, and fine powder escapes, resulting in a reduced recovery rate. Therefore, variable frequency speed regulation cannot simultaneously guarantee safety and efficiency under this operating condition. Therefore, this invention proposes a powder recovery device for electrostatic spraying production lines.

[0004] To achieve the above objectives, the present invention employs the following technology: a powder recovery device for an electrostatic spraying production line. The device includes a recovery unit body and at least two parallel cyclone separators installed on the recovery unit body. Each cyclone separator includes a separation chamber and a gas channel located in the middle of the separation chamber. The powder-containing gas flow is diverted into the separation chamber through the recovery unit body. After separation, the gas flow is discharged through the gas channel, and the powder enters the recovery unit body. The recovery unit body includes a powder hopper for storing powder. The separation chamber is connected to the powder hopper through a powder discharge channel installed at the end, and the powder enters the powder hopper through the powder discharge channel. The powder discharge channel is rotatably equipped with an opening and closing mechanism for controlling the opening and closing of the separation chamber. The opening and closing mechanism includes a gate installed at the gas channel inlet and a powder guide hopper rotatably equipped on the powder discharge channel for controlling the opening and closing of the gate. The powder guide hopper is connected to the gate through a transmission rod. The powder guiding hopper is driven to rotate by a synchronization mechanism, which includes a gear set on the powder guiding hopper and several racks rotated inside the powder hopper. After the racks rotate and mesh with at least one gear, they drive the powder guiding hopper to rotate and close the gas passage. The air volume is redistributed and concentrated at the separation chamber where the gas passage is not closed, and the flow rate and velocity at the inlet of the separation chamber increase.

[0005] A further description of a powder recovery device for an electrostatic spraying production line as described above: The main body of the recovery device also includes a parallel flow chamber installed on the powder chamber. The parallel flow chamber is connected to the gas channel through an exhaust pipe. The separation chamber is connected to the distributor through a connecting pipe. An air inlet pipe that draws in the powder-containing gas flow is installed on the distributor. When a negative pressure is generated in the parallel flow chamber, the powder-containing gas flow in the splitter is drawn in through the connecting pipe. When the gas channel is closed, the separation chamber stops drawing in the powder-containing gas flow, while the intake speed of the separation chamber with the gas channel open increases.

[0006] A further description of a powder recovery device for an electrostatic spraying production line as described above: The gate includes a fixed ring fixedly installed on the gas channel and a rotating ring rotatably installed. The rotating ring is provided with a gate plate for sealing the through hole opened on the surface of the fixed ring. The powder guide hopper is connected to the rotating ring through a transmission rod.

[0007] A further description of a powder recovery device for an electrostatic spraying production line as described above: The transmission rod includes a first universal joint mounted on a rotating ring, and a second universal joint is mounted on the powder guide hopper via a mounting base. The first universal joint and the second universal joint are connected by a connecting rod.

[0008] A further description of a powder recovery device for an electrostatic spraying production line as described above: The synchronization mechanism also includes a turntable that is rotatably installed inside the powder hopper, and a rack mounted on the turntable that meshes with at least two gears in sequence as the turntable rotates.

[0009] A further description of a powder recovery device for an electrostatic spraying production line as described above: The synchronization mechanism also includes a damping strip disposed on the powder discharge channel, and the powder guide hopper is slidably embedded in the damping strip.

[0010] A further description of a powder recovery device for an electrostatic spraying production line as described above: The surface of the turntable is provided with an arc-shaped groove for the powder discharge channel to pass through, and the arc-shaped groove is provided with a head end and an end end; When the powder discharge channel closest to the beginning of the arc-shaped groove is in contact with the arc-shaped groove, all gas channels are opened; When the powder discharge channel closest to the end of the arc-shaped groove is in contact with the arc-shaped groove, the gas channels are completely closed; When neither end of the arc-shaped groove is in contact with the powder discharge channel, the gas channel is partially closed.

[0011] A further description of a powder recovery device for an electrostatic spraying production line as described above: The powder guiding hopper is equipped with at least one crushing mechanism. The crushing mechanism includes a chute opened on the powder guiding hopper, a slider is slidably embedded in the chute, and an insert rod is installed at the end of the slider. When the slider rises along the length of the chute, the insert rod is vertically inclined and inserted into the powder discharge channel. When the gate is opened, the insert rod is kept in the descending position.

[0012] A further description of a powder recovery device for an electrostatic spraying production line as described above: The slider is reciprocated by a lifting mechanism. The lifting mechanism includes a guide ring fixedly installed on the inner wall of the powder hopper by a mounting bracket. The guide ring is sleeved on the surface of the powder guide hopper, and the surface of the guide ring is provided with a wavy through-hole groove. The slider is equipped with a telescopic rod, which passes through a straight groove and a wavy through-hole groove on the surface of the slide groove in sequence. A positioning element that fits the surface of the guide ring is installed at the end of the telescopic rod.

[0013] A further description of a powder recovery device for an electrostatic spraying production line as described above: The guide ring includes an upper plate and a lower plate respectively mounted on two mounting brackets, and the upper plate and the lower plate are rotatably connected to the powder guiding hopper through a fitting groove; The upper plate and the lower plate are respectively equipped with a first guide rail and a second guide rail, and the first guide rail and the second guide rail are combined to form a wave-shaped through-hole groove that cooperates with the telescopic rod.

[0014] One of the above technical solutions has the following advantages or beneficial effects: 1. Through the set opening and closing mechanism, by rotating the powder guide hopper, the powder guide hopper drives the second universal joint to rotate through the mounting base. The second universal joint drives the first universal joint to rotate through the connecting rod, which in turn drives the rotating ring to rotate. The gate plate rotates to the position corresponding to the through hole under the drive of the rotating ring. At this time, the gas passage of the through hole is closed, and the separation chamber stops sucking in the powder-containing airflow. By reducing the number of parallel gas passages, the air volume is redistributed and concentrated to the separation chamber where the gas passage is not closed. The cross-sectional flow rate and velocity at the inlet of the separation chamber increase, and the centrifugal acceleration increases accordingly. Under the condition that the total air volume remains unchanged, the same fine powder separation effect as frequency conversion speed increase is achieved, and the energy-saving advantage of unchanged total power consumption is also achieved. 2. Through the set synchronization mechanism, when it is necessary to recover fine powder, the rotating turntable drives the four racks to mesh with the four gears respectively, so that the gears drive the powder guide bucket to rotate under the restriction of the damping strip. At the same time, the powder guide bucket drives the gate to rotate and close through the transmission rod, closing the four gas channels. The inlet wind speed of the remaining four separation chambers increases, and the fine powder is captured and recovered by the cyclone separator. At this time, neither end of the arc groove is in contact with the powder discharge channel, and the turntable can continue to rotate in the forward or reverse direction. Attached Figure Description

[0015] Figure 1 A three-dimensional structural schematic diagram of a powder recovery device for an electrostatic spraying production line is shown; Figure 2 A three-dimensional cross-sectional schematic diagram of a powder recovery device for an electrostatic spraying production line and a schematic diagram of the gas and powder flow direction are shown. Figure 3 A three-dimensional structural schematic diagram of a cyclone separator is shown; Figure 4 A three-dimensional cross-sectional structural diagram of a cyclone separator is shown; Figure 5 A schematic diagram of the first three-dimensional structure of the opening and closing mechanism is shown; Figure 6 A schematic diagram of the second three-dimensional structure of the opening and closing mechanism is shown; Figure 7 A three-dimensional cross-sectional structural diagram of the powder guiding hopper is shown; Figure 8 A first three-dimensional cross-sectional structural diagram of a synchronization mechanism simultaneously controlling multiple opening and closing mechanisms is shown. Figure 9 A second three-dimensional cross-sectional structural diagram of a synchronization mechanism simultaneously controlling multiple opening and closing mechanisms is shown. Figure 10 A three-dimensional structural diagram of the turntable is shown; Figure 11 It shows Figure 7 Enlarged structural diagram at point A; Figure 12A three-dimensional structural schematic diagram of the crushing mechanism inside the powder guiding hopper is shown; Figure 13 A three-dimensional structural schematic diagram of the crushing mechanism is shown; Figure 14 A three-dimensional structural diagram of the lifting mechanism is shown; Figure 15 A three-dimensional structural diagram of the upper plate is shown; Figure 16 A three-dimensional structural diagram of the lower plate is shown; Figure 17 This diagram shows a three-dimensional cross-sectional view of the crushing mechanism when it is inserted into the powder discharge channel via a lifting mechanism. Figure 18 This diagram shows a three-dimensional cross-sectional view of the crushing mechanism as it exits the powder discharge channel via a lifting mechanism. Figure 19 A three-dimensional structural schematic diagram of the drive mechanism is shown; Figure 20 A three-dimensional cross-sectional structural diagram of the drive mechanism is shown.

[0016] Legend: 10. Recovery device body; 11. Inlet pipe; 12. Diverter; 13. Connecting pipe; 14. Exhaust pipe; 15. Parallel flow chamber; 16. Powder chamber; 17. Negative pressure pipeline; 20. Cyclone separator; 21. Separation chamber; 22. Gas passage; 23. Powder discharge passage; 30. Opening and closing mechanism; 31. Gate; 311. Fixed ring; 312. Through hole; 313. Rotating ring; 314. Gate plate; 32. Powder guide hopper; 321. Mounting base; 33. Transmission rod; 331. First universal joint; 332. Connecting rod; 333. Second universal joint; 40. Synchronization mechanism; 41. Turntable; 42. Arc groove; 43. Rack; 44. Gear; 45. Damping bar; 50. Crushing mechanism; 51. Slide chute; 52. Sliding block; 53. Inserting rod; 60. Lifting mechanism; 61. Telescopic rod; 62. Positioning component; 63. Mounting bracket; 64. Guide ring; 641. Upper plate; 642. First guide rail; 643. Lower plate; 644. Second guide rail; 645. Fitting groove; 70. Drive mechanism; 71. Servo motor; 72. Pulley; 73. Transmission belt; 74. Rotating groove; 75. Rotating frame. Detailed Implementation

[0017] The powder recovery device for an electrostatic spraying production line according to the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To address the issue that as the impeller's kinetic energy increases significantly with rotational speed, prolonged high-speed operation can cause current surges exceeding the inverter's tolerance, easily triggering overvoltage stall and causing protection tripping. In this situation, the fan is forced to reduce speed. However, the reduced speed and airflow decrease the centrifugal separation efficiency of the cyclone separator, leading to fine powder escape and a lower recovery rate. Therefore, variable frequency speed control cannot simultaneously guarantee safety and efficiency under this condition. This invention proposes a powder recovery device for electrostatic spraying production lines, such as... Figure 1 - Figure 20 As shown: The device includes a recovery unit body 10 and at least two parallel cyclone separators 20 installed on the recovery unit body 10. Preferably, there are eight cyclone separators 20, and the cyclone separators 20 are installed at an angle on the recovery unit body 10. The angled installation allows the powder to slide down naturally under the action of gravity, avoiding powder accumulation and blockage. The cyclone separator 20 includes a separation chamber 21 and a gas channel 22 located in the middle of the separation chamber 21. The powder-containing gas flow is diverted into the separation chamber 21 through the recovery unit body 10. After separation, the gas is discharged through the gas channel 22, and the powder enters the recovery unit body 10. The recovery unit body 10 includes a powder bin 16 for storing powder. The separation chamber 21 is connected to the powder bin 16 through a powder discharge channel 23 installed at the end. The powder enters the powder bin 16 through the powder discharge channel 23. like Figure 1 and Figure 2 As shown, the main body 10 of the recovery device also includes a parallel flow chamber 15 installed on the powder chamber 16. Preferably, the negative pressure pipe 17 installed on the parallel flow chamber 15 is connected to a vacuum pump (not shown in the figure). The vacuum pump continuously extracts the gas in the parallel flow chamber 15 to form a negative pressure in the parallel flow chamber 15. The parallel flow chamber 15 is connected to the gas channel 22 through the exhaust pipe 14. The separation chamber 21 is connected to the distributor 12 through the connecting pipe 13. The distributor 12 is equipped with an air inlet pipe 11 for drawing in the powder-containing gas flow. like Figure 2As shown, under the influence of negative pressure in the co-flow chamber 15, the powder-containing air at the production line is drawn into the splitter 12 through the air inlet pipe 11, and then split by the splitter 12 to form a powder-containing airflow. The powder-containing airflow enters the separation chamber 21 through the connecting pipe 13. Under the guidance of the tangential inlet of the separation chamber 21, the powder-containing airflow spontaneously generates an external swirling flow field, causing the powder to migrate to the wall of the separation chamber 21 under the action of centrifugal acceleration, and slide down along the inner wall of the cone of the separation chamber 21 to the bottom powder discharge channel 23. The purified airflow is discharged from the separation chamber 21 through the gas channel 22. Multiple exhaust pipes 14 guide the purified airflow into the co-flow chamber 15 for convergence, and then discharge or conduct it to other secondary fine separation structures through the negative pressure pipe 17.

[0019] To improve the collection rate of fine powder without increasing the speed through frequency conversion and while maintaining a constant total air volume, such as... Figure 1 - Figure 4 , Figure 8 and Figure 9 As shown, an opening and closing mechanism 30 for controlling the opening and closing of the separation chamber 21 is rotatably provided on the powder discharge channel 23. The opening and closing mechanism 30 includes a gate 31 provided at the inlet of the gas channel 22. A powder guide hopper 32 for controlling the opening and closing of the gate 31 is rotatably provided on the powder discharge channel 23. The powder guide hopper 32 is connected to the gate 31 through a transmission rod 33. Preferred, such as Figure 5 and Figure 6 As shown, the gate 31 includes a fixed ring 311 fixedly disposed on the gas passage 22 and a rotating ring 313 rotatably disposed on the gas passage 22. The rotating ring 313 is provided with a gate plate 314 for sealing the through hole 312 opened on the surface of the fixed ring 311. The powder guide hopper 32 is connected to the rotating ring 313 through a transmission rod 33. Furthermore, the transmission rod 33 includes a first universal joint 331 mounted on the rotating ring 313, and the powder guide hopper 32 is mounted with a second universal joint 333 via the mounting base 321. The first universal joint 331 and the second universal joint 333 are connected by a connecting rod 332. Since the separation chamber 21 is conical and inclined, the rotation axes of the rotating ring 313 and the powder guide hopper 32 are not on the same straight line. Therefore, through this design, the second universal joint 333 can transmit torque to the first universal joint 331 via the connecting rod 332, avoiding the influence caused by the included angle between the rotation axes of the rotating ring 313 and the powder guide hopper 32, and preventing jamming due to rotational interference.

[0020] By rotating the powder guide hopper 32, the powder guide hopper 32 drives the second universal joint 333 to rotate through the mounting base 321. The second universal joint 333 drives the first universal joint 331 to rotate through the connecting rod 332. The first universal joint 331 drives the rotating ring 313 to rotate. The gate 314 rotates to the position corresponding to the through hole 312 under the drive of the rotating ring 313. At this time, the through hole 312 blocks the gas channel 22 and closes. The separation chamber 21 stops sucking in the powder-containing airflow. By reducing the number of parallel gas channels 22, the air volume is redistributed and concentrated to the separation chamber 21 where the gas channel 22 is not closed. The cross-sectional flow rate and velocity at the inlet of the separation chamber 21 increase, and the centrifugal acceleration increases accordingly. Under the condition that the total air volume remains unchanged, the same fine powder separation effect as frequency conversion speed increase is achieved, and the energy-saving advantage of unchanged total power consumption is also achieved. To achieve synchronous control of the rotation of the powder guide hopper 32, such as Figure 7 - Figure 11 As shown, the powder guide hopper 32 is driven to rotate by a synchronization mechanism 40. The synchronization mechanism 40 includes a gear 44 mounted on the powder guide hopper 32 and a turntable 41 rotatably mounted in the powder hopper 16. Several racks 43 are rotatably mounted in the powder hopper 16. The racks 43 are mounted on the turntable 41 and rotate with the turntable 41. Preferably, there are four racks 43. Each rack 43 meshes with two gears 44 in sequence when it rotates with the turntable 41. After the racks 43 rotate and mesh with the gears 44, they drive the powder guide hopper 32 to rotate and close the gas passage 22. In order to control the rotation angle of the turntable 41, an arc-shaped groove 42 is provided on the surface of the turntable 41 for the powder discharge passage 23 to pass through. The arc-shaped groove 42 is provided with a head end and an end end. Preferably, the synchronization mechanism 40 further includes a damping strip 45 disposed on the powder discharge channel 23, and the powder guide hopper 32 is slidably embedded in the damping strip 45. The damping strip 45 provides rotational damping to prevent the powder guide hopper 32 from rotating erroneously under the impact of airflow. Specifically, when fine powder needs to be recovered, the rotating disc 41 drives the four racks 43 to mesh with the four gears 44 respectively, so that the gears 44 drive the powder guide hopper 32 to rotate under the restriction of the damping strip 45. At the same time, the powder guide hopper 32 drives the gate 31 to rotate and close through the transmission rod 33, the four gas channels 22 are closed, and the inlet wind speed of the remaining four separation chambers 21 is increased. The fine powder is captured and recovered by the cyclone separator 20. At this time, neither end of the arc groove 42 is in contact with the powder discharge channel 23, and the disc 41 can continue to rotate in the forward or reverse direction. When it is necessary to recycle standard powder, the turntable 41 is rotated in the opposite direction. The four racks 43 drive the four gears 44 to rotate in the opposite direction. The gate 31 rotates and opens and closes the four gas channels 22. All eight gas channels 22 are opened, and the low wind speed operation is restored. At this time, the powder discharge channel 23 closest to the beginning of the arc groove 42 fits into the arc groove 42, and the turntable 41 can no longer rotate in the opposite direction. When a shutdown for maintenance is required, the turntable 41 is rotated so that the four racks 43 mesh with the eight gears 44 in sequence, and all eight gas channels 22 are closed. At this time, when the powder discharge channel 23 closest to the end of the arc groove 42 is in contact with the arc groove 42, all gas channels 22 are closed. At this time, the powder discharge channel 23 closest to the end of the arc groove 42 is in contact with the arc groove 42, and the turntable 41 cannot continue to rotate in the forward direction.

[0021] When only four gas channels 22 are open, the amount of powder passing through the powder discharge channel 23 per unit time doubles under high wind speed, while the cross-sectional area of ​​the powder discharge channel 23 remains unchanged. Therefore, when recovering powders with poor flowability, blockage of the powder discharge channel 23 is likely to occur. To avoid this problem, such as... Figure 12 and Figure 13 As shown, at least one crushing mechanism 50 is provided inside the powder guiding hopper 32. The crushing mechanism 50 includes a groove 51 opened on the powder guiding hopper 32. A slider 52 is slidably embedded in the groove 51, and an insertion rod 53 is installed at the end of the slider 52. Preferably, the end of the insertion rod 53 is pointed. When the slider 52 rises along the length direction of the groove 51, the insertion rod 53 is vertically inclined and inserted into the powder discharge channel 23 to break up the blocking powder, thereby clearing the powder discharge channel 23 and avoiding the complete blockage of the powder discharge channel 23 due to powder accumulation. It should be noted that when the gate 31 is opened, the insertion rod 53 is kept in the descending position to avoid interfering with the passage of powder.

[0022] Furthermore, such as Figure 14 , Figure 17 and Figure 18 As shown, the slider 52 reciprocates and rises via the lifting mechanism 60. The lifting mechanism 60 includes a guide ring 64 fixedly mounted on the inner wall of the powder hopper 16 via a mounting bracket 63. The guide ring 64 is sleeved on the surface of the powder guide hopper 32, and a wavy through-hole groove is opened on the surface of the guide ring 64. A telescopic rod 61 is installed on the slider 52. The telescopic rod 61 passes through the straight groove and the wavy through-hole groove opened on the surface of the slide groove 51 in sequence. A positioning part 62 that fits the surface of the guide ring 64 is installed at the end of the telescopic rod 61. With this design, when the gas channel 22 is opened and closed by rotating the turntable 41, the powder guide hopper 32 rotates under the drive of the gear 44. At the same time, the powder guide hopper 32 drives the telescopic rod 61 to slide in the wave-shaped through-hole groove opened on the surface of the guide ring 64. Due to the restriction of the positioning part 62, the telescopic rod 61 pushes the slider 52 to move up and down in the slide groove 51 while reciprocating. Without the need for an additional power source, the powder guide hopper 32 drives the insertion rod 53 to perform crushing work by rotating on its own. Preferred, such as Figure 15 and Figure 16As shown, the guide ring 64 includes an upper plate 641 and a lower plate 643 respectively mounted on two mounting brackets 63, and the upper plate 641 and the lower plate 643 are rotatably connected to the powder guiding hopper 32 through a fitting groove 645. A first guide rail 642 and a second guide rail 644 are respectively mounted on the upper plate 641 and the lower plate 643. The first guide rail 642 and the second guide rail 644 are combined to form a wave-shaped through-hole groove that cooperates with the telescopic rod 61. The guide ring 64 is composed of an upper plate 641 and a lower plate 643. It is rotatably connected to the powder guide hopper 32 through a fitting groove 645, which prevents the powder guide hopper 32 from driving the guide ring 64 to rotate synchronously. At the same time, since there is a difference in direction and force when the first guide rail 642 and the second guide rail 644 push the telescopic rod 61 to move, the second guide rail 644 wears faster than the first guide rail 642. By realizing the independent disassembly and assembly of the upper plate 641 or the lower plate 643, the purpose of facilitating assembly and maintenance and reducing operation and maintenance costs is achieved.

[0023] like Figure 19 and Figure 20 As shown, in order to drive the turntable 41 to rotate, a drive mechanism 70 is installed on the outer wall of the powder chamber 16. The drive mechanism 70 includes a servo motor 71 and a rotating groove 74 opened on the outer wall of the powder chamber 16. A rotating frame 75 is rotatably arranged in the rotating groove 74. A pulley 72 is mounted on the servo motor 71. A transmission belt 73 is fitted onto the surface of the pulley 72 and the rotating frame 75. By starting the servo motor 71, the pulley 72 is driven to rotate, which in turn drives the rotating frame 75 to rotate under the constraint of the rotating groove 74 via the transmission belt 73. The rotating frame 75 drives the turntable 41 to rotate, controlling the opening and closing of the gas channel 22. The servo motor 71 drives the precise control of the rotation angle of the turntable 41.

[0024] Working principle: When it is necessary to recover fine powder: Start the servo motor 71 to rotate the turntable 41 in the forward direction; The four racks 43 on the turntable 41 mesh with the four gears 44 in sequence. The gears 44 drive the powder guide hopper 32 to rotate under the restriction of the damping strip 45. At the same time, the powder guide hopper 32 drives the gate 31 to rotate and close through the transmission rod 33. The four gas passages 22 are blocked by the gate plate 314. The total air volume remains unchanged, but the air volume is concentrated in the remaining four separation chambers 21, the inlet air velocity doubles, the centrifugal acceleration increases, and the fine powder collection rate is significantly improved. At this time, neither end of the arc groove 42 is in contact with the powder discharge channel 23, and the turntable 41 can continue to rotate in either the forward or reverse direction. At the same time, the rotation of the powder guide hopper 32 drives the telescopic rod 61 to slide in the wave-shaped through-hole groove of the guide ring 64, the positioning part 62 pushes the slider 52 to move up and down in the slide groove 51, and the insertion rod 53 automatically inserts into the powder discharge channel 23 to disperse the clogging powder and prevent the channel from becoming blocked under high powder discharge volume. When it is necessary to recycle standard powder: When the turntable 41 is rotated in the opposite direction, the four racks 43 drive the four gears 44 to rotate in the opposite direction, and the gate 31 rotates and opens accordingly. The four previously closed gas channels 22 are all opened, all eight channels are restored to work, and the inlet wind speed returns to a low wind speed state, which is suitable for recycling standard particle size powder. At this time, the first end of the arc-shaped groove 42 is in contact with the powder discharge channel 23, and the turntable 41 is locked and cannot continue to rotate in the opposite direction to prevent accidental operation. During shutdown for maintenance: As the turntable 41 continues to rotate in the forward direction, the four racks 43 mesh with all eight gears 44 in sequence, all eight gas passages 22 are closed by the gate 31, and all separation chambers 21 stop working. At this time, the end of the arc groove 42 is in contact with the powder discharge channel 23, and the turntable 41 is locked and cannot continue to rotate in the forward direction, ensuring maintenance safety. The damping strip 45 provides rotational damping to prevent the powder guide hopper 32 from rotating accidentally under the impact of airflow. It is not removable.

[0025] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the present invention's technology, to a powder recovery device for an electrostatic spraying production line and its inventive concept, should be covered within the scope of protection of the present invention.

Claims

1. A powder recovery device for an electrostatic spraying production line, comprising a recovery device body (10) and at least two parallel cyclone separators (20) mounted on the recovery device body (10), wherein each cyclone separator (20) includes a separation chamber (21) and a gas channel (22) disposed in the middle of the separation chamber (21), wherein the powder-containing gas flow is diverted into the separation chamber (21) through the recovery device body (10), and the separated gas flow is discharged through the gas channel (22), while the powder enters the recovery device body (10), characterized in that, The main body (10) of the recycling device includes a powder bin (16) for storing powder, and a separation chamber (21) is connected to the powder bin (16) through a powder discharge channel (23) installed at the end. The powder enters the powder bin (16) through the powder discharge channel (23). The powder discharge channel (23) is rotatably provided with an opening and closing mechanism (30) for controlling the opening and closing of the separation chamber (21). The opening and closing mechanism (30) includes a gate (31) provided at the inlet of the gas channel (22). The powder discharge channel (23) is rotatably provided with a powder guide hopper (32) for controlling the opening and closing of the gate (31). The powder guide hopper (32) is connected to the gate (31) through a transmission rod (33). The powder guiding hopper (32) is driven to rotate by a synchronization mechanism (40). The synchronization mechanism (40) includes a gear (44) set on the powder guiding hopper (32) and several racks (43) rotatably set inside the powder hopper (16). After the racks (43) rotate and mesh with at least one gear (44), they drive the powder guiding hopper (32) to rotate and close the gas passage (22). The air volume is redistributed and concentrated at the separation chamber (21) where the gas passage (22) is not closed. The flow rate and velocity at the inlet of the separation chamber (21) increase.

2. The powder recovery device for an electrostatic spraying production line according to claim 1, characterized in that, The main body (10) of the recovery device also includes a parallel flow chamber (15) installed on the powder chamber (16). The parallel flow chamber (15) is connected to the gas channel (22) through the exhaust pipe (14). The separation chamber (21) is connected to the splitter (12) through the connecting pipe (13). The splitter (12) is equipped with an air inlet pipe (11) for drawing in the powder-containing gas flow. When a negative pressure is generated in the parallel flow chamber (15), the powder-containing airflow in the splitter (12) is drawn in through the connecting pipe (13). When the gas channel (22) is closed, the separation chamber (21) stops drawing in the powder-containing airflow, and at the same time, the drawing speed of the separation chamber (21) with the gas channel (22) not closed increases.

3. The powder recovery device for an electrostatic spraying production line according to claim 1, characterized in that, The gate (31) includes a fixed ring (311) fixedly installed on the gas channel (22) and a rotating ring (313) rotatably installed. The rotating ring (313) is provided with a gate plate (314) for blocking the through hole (312) opened on the surface of the fixed ring (311). The powder guide hopper (32) is connected to the rotating ring (313) through a transmission rod (33).

4. A powder recovery device for an electrostatic spraying production line according to claim 3, characterized in that, The transmission rod (33) includes a first universal joint (331) mounted on a rotating ring (313), and a second universal joint (333) is mounted on a powder guide hopper (32) via a mounting base (321). The first universal joint (331) and the second universal joint (333) are connected by a connecting rod (332).

5. A powder recovery device for an electrostatic spraying production line according to claim 1, characterized in that, The synchronization mechanism (40) also includes a turntable (41) rotatably disposed in the powder chamber (16), and a rack (43) is mounted on the turntable (41) and meshes with at least two gears (44) in sequence as the turntable (41) rotates.

6. A powder recovery device for an electrostatic spraying production line according to claim 5, characterized in that, The synchronization mechanism (40) also includes a damping strip (45) disposed on the powder discharge channel (23), and the powder guide hopper (32) is slidably embedded on the damping strip (45).

7. A powder recovery device for an electrostatic spraying production line according to claim 5, characterized in that, The surface of the turntable (41) is provided with an arc-shaped groove (42) through which the powder discharge channel (23) passes. The arc-shaped groove (42) is provided with a head end and an end end. When the powder discharge channel (23) closest to the beginning of the arc groove (42) is in contact with the arc groove (42), the gas channel (22) is fully opened; When the powder discharge channel (23) closest to the end of the arc groove (42) is in contact with the arc groove (42), the gas channel (22) is completely closed; When neither end of the arc groove (42) is in contact with the powder discharge channel (23), the gas channel (22) is partially closed.

8. A powder recovery device for an electrostatic spraying production line according to claim 1, characterized in that, The powder guiding hopper (32) is provided with at least one crushing mechanism (50). The crushing mechanism (50) includes a groove (51) opened on the powder guiding hopper (32). A slider (52) is slidably embedded in the groove (51), and a rod (53) is installed at the end of the slider (52). When the slider (52) rises along the length of the groove (51), the rod (53) remains vertically inclined and is inserted into the powder discharge channel (23). When the gate (31) is opened, the rod (53) remains in the descending position.

9. A powder recovery device for an electrostatic spraying production line according to claim 8, characterized in that, The slider (52) is reciprocated by the lifting mechanism (60). The lifting mechanism (60) includes a guide ring (64) fixedly installed on the inner wall of the powder hopper (16) by the mounting bracket (63). The guide ring (64) is sleeved on the surface of the powder guide hopper (32), and the surface of the guide ring (64) is provided with a wave-shaped through hole groove. The slider (52) is equipped with a telescopic rod (61), which passes through the straight groove and the wavy through hole groove opened on the surface of the slide groove (51) in sequence. The end of the telescopic rod (61) is equipped with a positioning part (62) that fits the surface of the guide ring (64).

10. A powder recovery device for an electrostatic spraying production line according to claim 9, characterized in that, The guide ring (64) includes an upper plate (641) and a lower plate (643) respectively mounted on two mounting brackets (63), and the upper plate (641) and the lower plate (643) are rotatably connected to the powder guide hopper (32) through a fitting groove (645); The upper plate (641) and the lower plate (643) are respectively equipped with a first guide rail (642) and a second guide rail (644), and the first guide rail (642) and the second guide rail (644) are combined to form a wave-shaped through-hole groove that cooperates with the telescopic rod (61).

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