Sieving equipment for controlling polyester resin particles for powder coating

Abstract

The invention discloses screening equipment for controlling polyester resin particles for powder coating, and belongs to the technical field of polyester resin powder coating production. A discharging pipe is arranged on the bottom wall of the shell, a blocking driving shaft is rotationally arranged in the discharging pipe, a blocking plate is fixedly connected to the blocking driving shaft through a connecting plate, and the blocking plate is configured to be driven by the blocking driving shaft to slide in a manner of being attached to the inner wall of the discharging pipe; the screen drum is rotationally arranged in the shell, a supporting frame is fixedly arranged in the shell, the upper portion of the supporting frame extends into the screen drum, a first magnet is slidably arranged on the supporting frame, a cleaning plate is fixedly arranged at the end, facing the side wall of the screen drum, of the first magnet, a cleaning brush is installed on the cleaning plate, a rotating shaft is rotationally arranged on the inner top wall of the shell, and a second magnet is fixedly arranged on the rotating shaft. Magnetic poles at two ends of the second magnet are opposite. According to the screening equipment for controlling the polyester resin particles for the powder coating, the side wall of a screen can be cleaned in the screening process, and the screening efficiency is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of polyester resin powder coating production, in particular to a screening device for controlling polyester resin particles used for powder coating. Background Art

[0002] Powder coatings are widely used in the fields of aluminum extrusion coating for doors and windows, home appliances and furniture, bicycle bodies, etc. Polyester resin powder coatings are a common powder coating and have better weather resistance and heat resistance than other powder coatings.

[0003] When polyester resin particles are used as powder coatings, they need to be processed into powder. Since polyester resin has strong hygroscopicity and easily absorbs water vapor in the air, some of the processed powder coatings may be in block form or granular form with larger particle size during actual processing and production. In order to ensure the quality of the finished powder coating, the coating processed into powder needs to be screened to obtain the required fineness and particle size. At present, a screen is usually used as a screening device to screen the polyester resin for powder coating. When the existing screening equipment is used to screen the polyester resin particles for powder coating, the powder coating is very easy to adhere to the surface of the screen, and as the use time increases, it may even cause a large number of screen meshes to be blocked, resulting in the inability to smoothly perform the screening work, thereby affecting the overall screening efficiency. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a screening device for controlling polyester resin particles for powder coatings, so as to at least partially solve the problems raised in the above background technology.

[0005] The present invention provides the following technical solution: A screening device for controlling polyester resin particles for powder coatings proposed by the present invention comprises: shell; A screen drum is rotatably arranged in the outer shell; A support frame, wherein the support frame is fixedly disposed in the outer shell, and an upper portion of the support frame extends into the screen drum; Wherein, a first magnet is slidably provided on the support frame, a cleaning plate is fixedly provided at one end of the first magnet facing the side wall of the screen drum, and a cleaning brush is installed on the cleaning plate; A rotating shaft is rotatably provided on the inner top wall of the shell, and a second magnet is fixedly provided on the rotating shaft. The magnetic poles at both ends of the second magnet are opposite, and the second magnet is driven by the rotating shaft to change the magnetic pole toward the first magnet. The first magnet is magnetically attracted and magnetically repelled by the second magnet and slides up and down along the support frame. When the first magnet is lifted and slid, it drives the cleaning brush to clean the side wall of the screen drum.

[0006] Furthermore, the support frame includes a fixed frame, a vertical support column, a transverse support plate and a guide slide column. The fixed frame is fixedly arranged on the bottom wall of the outer shell, the vertical support column is fixedly arranged on the fixed frame, the middle part of the transverse support plate is fixedly connected to the upper end of the vertical support column, the transverse support plate is located in the screen cylinder, the guide slide column is vertically arranged on the transverse support plate, and the first magnet is slidably arranged on the guide slide column.

[0007] Furthermore, in order to ensure the vertical sliding of the first magnet along the guide slide column, two guide slide columns are provided, and the first magnet is slidably arranged on the two groups of guide slide columns.

[0008] Furthermore, a driving motor is fixedly provided on the top wall of the shell, an active bevel gear is fixedly provided on the output shaft of the driving motor, a feed hopper is rotatably provided on the top wall of the shell, the screen cylinder is fixedly connected to the lower end of the feed hopper, a driven bevel gear is fixedly provided on the feed hopper, and the driven bevel gear is meshed with the active bevel gear.

[0009] Furthermore, a shaft seat is fixedly provided on the inner top wall of the shell, the rotating shaft is rotatably provided on the shaft seat, a transmission bevel gear is fixedly provided on the feed hopper, a driving bevel gear is fixedly provided on the rotating shaft, and the driving bevel gear is meshed with the transmission bevel gear.

[0010] Furthermore, a connecting column is fixedly provided in the middle of the bottom wall of the sieve cylinder, a connecting frame is fixedly provided on the connecting column, a scraper is fixedly installed on the connecting frame, the scraper is fitted with the inner bottom wall of the outer shell, and the vertical support column passes through the connecting column and extends into the sieve cylinder.

[0011] Furthermore, a crushing motor is fixedly arranged on the fixed frame, and an output shaft of the crushing motor sequentially passes through the middle of the vertical support column and the horizontal support plate and extends into the screen cylinder, and a crushing blade is fixedly arranged on the output shaft of the crushing motor.

[0012] Furthermore, a discharge pipe is provided on the bottom wall of the outer shell, and a blocking drive shaft is rotatably provided in the discharge pipe. A blocking plate is fixedly connected to the blocking drive shaft via a connecting plate. The blocking plate is configured to be driven by the blocking drive shaft to slide against the inner wall of the discharge pipe, and the blocking plate is used to block the outlet of the discharge pipe.

[0013] Furthermore, the middle part of the discharge pipe is a spherical body, the sealing plate is a spherical crown, a motor base plate is fixedly provided on the bottom wall of the shell, a sealing motor is fixedly provided on the motor base plate, and the sealing drive shaft is connected to the output shaft of the sealing motor.

[0014] Furthermore, a transfer mechanism is provided under the shell, and the transfer mechanism includes a transfer component and a placement table. The placement table is fixed on the transfer component. Two groups of the placement tables are provided on the transfer component. The two groups of the placement tables are placed under the discharge pipe in turn. A packaging box is detachably provided on the placement table.

[0015] Furthermore, the transfer assembly includes a support seat, a transfer screw, a transfer slide rod and a transfer motor, the transfer screw is rotatably arranged on the support seat, the transfer motor is fixedly arranged on the support seat, the transfer screw is fixedly connected to the output shaft of the transfer motor, the transfer slide rod is fixedly arranged on the support seat, the transfer screw is threadedly connected to a transfer plate, and the transfer plate is slidably arranged on the transfer slide rod.

[0016] Furthermore, a lifting cylinder is provided on the upper surface of the transfer plate, and the placement table is fixedly connected to the free end of the lifting cylinder. Two groups of the lifting cylinder and the placement table are correspondingly provided. A fixed cavity is provided in the placement table, and a fixed motor is fixedly provided on the bottom wall of the fixed cavity. Two groups of bidirectional screws are rotatably provided on the inner wall of the fixed cavity. A belt pulley is fixedly provided on the middle part of the bidirectional screw corresponding to the output shaft of the fixed motor, and a synchronous belt is sleeved on the belt pulley. Both ends of the bidirectional screw are respectively connected to a driving plate by threads, and a driving column is fixedly provided on the driving plate. The driving column is slidably provided on the side wall of the fixed cavity, and a fixed splint is fixedly provided on the free end of the driving column. The fixed splint is used to fix the packaging box.

[0017] Furthermore, a weighing scale is installed on the upper surface of the placement table, and the weighing scale is electrically connected to the blocking motor.

[0018] Furthermore, since the polyester resin particles are processed into powder, in order to avoid dust generation when the powder coating falls and is packaged, a cover plate is fixedly provided at the lower end of the discharge pipe, and the size of the cover plate is not less than the size of the opening of the packaging box.

[0019] The beneficial effects achieved by the present invention using the above structure are as follows: The rotating setting of the screen drum can realize efficient screening of polyester resin particles for powder coatings on the one hand; and the second magnet is synchronously driven to rotate while the screen drum rotates and screens, and the magnetic pole of the rotating second magnet changes relative to one end of the first magnet. Based on the principle of "like poles attract, unlike poles repel", the first magnet is driven to rise and fall along the guide slide column, thereby cleaning the side wall of the screen drum and ensuring the screening efficiency of polyester resin particles for powder coatings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 The overall structure of the embodiment of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of the embodiment of the present invention is shown in FIG. Figure 2 ; Figure 3 This is a schematic diagram of the overall structure of the embodiment of the present invention with the packaging box pair removed; Figure 4 It is a schematic diagram of a three-dimensional cross-sectional structure of an embodiment of the present invention; Figure 5 is a schematic diagram of a three-dimensional cross-sectional structure of a housing according to an embodiment of the present invention; Figure 6 for Figure 5 A partial enlarged view of part A; Figure 7 for Figure 5 A partial enlarged view of part B; Figure 8 for Figure 5 A partial enlarged view of part C; Fig. 9 is a schematic diagram of a three-dimensional cross-sectional structure of a transfer mechanism according to an embodiment of the present invention; Fig.10 It is a schematic diagram of a three-dimensional cross-sectional structure of a placement table according to an embodiment of the present invention.

[0021] Among them, 1. shell, 2. discharge pipe, 3. blocking drive shaft, 4. blocking plate, 5. screen drum, 6. first magnet, 7. cleaning plate, 8. cleaning brush, 9. rotating shaft, 10. second magnet, 11. fixing frame, 12. vertical support column, 13. horizontal support plate, 14. guide slide column, 15. driving motor, 16. active bevel gear, 17. feed hopper, 18. driven bevel gear, 19. shaft seat, 20. transmission bevel gear, 21. driving bevel gear, 22. connecting column, 23. , connecting frame, 24, scraper, 25, crushing motor, 26, crushing blade, 27, motor base plate, 28, blocking motor, 29, placing table, 30, packing box, 31, support seat, 32, transfer screw, 33, transfer slide, 34, transfer motor, 35, transfer plate, 36, lifting cylinder, 37, fixed cavity, 38, fixed motor, 39, bidirectional screw, 40, synchronous belt, 41, drive plate, 42, drive column, 43, fixed splint, 44, weighing scale, 45, cover plate. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0024] This embodiment is an improvement made to the technical problem that in the existing screening equipment for controlling polyester resin particles for powder coatings, the powder coatings tend to adhere to the surface of the screen as the screening proceeds, and even the mesh of the screen is clogged.

[0025] See also Figure 1-Figure 7 The present embodiment provides a screening device for controlling polyester resin particles for powder coatings, comprising: Shell 1; A screen drum 5 is rotatably disposed in the housing 1; A support frame, the support frame is fixedly arranged in the housing 1, and the upper part of the support frame extends into the screen drum 5; Among them, a first magnet 6 is slidably provided on the support frame, a cleaning plate 7 is fixedly provided at one end of the first magnet 6 facing the side wall of the screen drum 5, a cleaning brush 8 is installed on the cleaning plate 7, a rotating shaft 9 is rotatably provided on the inner top wall of the shell 1, a second magnet 10 is fixedly provided on the rotating shaft 9, the magnetic poles at both ends of the second magnet 10 are opposite, the second magnet 10 is driven by the rotating shaft 9 to change the magnetic pole of the side of the first magnet 6, the first magnet 6 is magnetically attracted and magnetically repelled by the second magnet 10 and slides up and down along the support frame, and the first magnet 6 drives the cleaning brush 8 to clean the side wall of the screen drum 5 when it slides up and down. When the second magnet 10 and the first magnet 6 have the same magnetic poles on one side close to each other, based on the principle of "like poles repel each other", the first magnet 6 slides downward along the support frame under the magnetic repulsion; when the second magnet 10 and the first magnet 6 have opposite magnetic poles on one side close to each other, based on the principle of "different poles attract each other", the first magnet 6 slides upward along the support frame under the magnetic attraction. In the process of the first magnet 6 rising and falling along the support frame, the first magnet 6 drives the cleaning brush 8 to clean the side wall of the sieve drum 5 through the cleaning plate 7 to prevent powder coating from adhering to the side wall of the sieve drum 5.

[0026] It should be noted that in this embodiment, in order to ensure that the first magnet 6 slides smoothly along the support frame, the magnetic attraction or magnetic repulsion between the second magnet 10 and the first magnet 6 must be greater than the sum of the gravity of the second magnet 10 itself and the sliding friction between the second magnet 10 and the support frame.

[0027] As a preferred technical solution of this embodiment, the second magnet 10 is a spherical structure, and the second magnet 10 is coaxial with the rotating shaft 9.

[0028] Specifically, see Figure 5 , Figure 6 and Figure 8 In this embodiment, the support frame includes a fixed frame 11, a vertical support column 12, a horizontal support plate 13 and a guide slide column 14. The fixed frame 11 is fixedly arranged on the bottom wall of the shell 1, the vertical support column 12 is fixedly arranged on the fixed frame 11, the middle part of the horizontal support plate 13 is fixedly connected to the upper end of the vertical support column 12, the horizontal support plate 13 is located in the screen drum 5, and the guide slide column 14 is vertically arranged on the horizontal support plate 13. The first magnet 6 is slidably arranged on the guide slide column 14, and the guide slide column 14 plays a guiding and limiting role in the sliding of the first magnet 6; there are two guide slide columns 14, and the first magnet 6 is slidably arranged on two groups of guide slide columns 14. The first magnet 6 is vertically lifted and slid by the cooperation of the two guide slide columns 14. During the vertical lifting and sliding of the first magnet 6, the cleaning brush 8 is in contact with the side wall of the screen drum 5.

[0029] It is worth noting that, in the specific implementation of this embodiment, guide slide columns 14 may be correspondingly arranged at multiple ends of the transverse support plate 13 , so as to cooperate with the multi-point arrangement of the cleaning brush 8 , and the cooperation of the multiple cleaning brushes 8 improves the cleaning of the screen drum 5 .

[0030] Specifically, see Figure 5 and Figure 7 In this embodiment, a driving motor 15 is fixedly provided on the top wall of the housing 1, and an active bevel gear 16 is fixedly provided on the output shaft of the driving motor 15. A feed hopper 17 is rotatably provided on the top wall of the housing 1. The screen drum 5 is fixedly connected to the lower end of the feed hopper 17. A driven bevel gear 18 is fixedly provided on the feed hopper 17. The driven bevel gear 18 meshes with the active bevel gear 16. The meshing of the active bevel gear 16 and the driven bevel gear 18 drives the screen drum 5 to rotate. When the screen drum 5 rotates, the centrifugal The polyester resin particles for powder coating are screened under the action of force; an axle seat 19 is fixedly provided on the inner top wall of the outer shell 1, and the rotating shaft 9 is rotatably provided on the axle seat 19, a transmission bevel gear 20 is fixedly provided on the feed hopper 17, and a driving bevel gear 21 is fixedly provided on the rotating shaft 9, and the driving bevel gear 21 is meshed with the transmission bevel gear 20. Under the meshing action of the transmission bevel gear 20 and the driving bevel gear 21, the rotating shaft 9 is driven to rotate, thereby driving the magnetic pole of the second magnet 10 to change toward the first magnet 6.

[0031] It is worth noting that the rotating shaft 9 , the second magnet 10 , and the first magnet 6 are all arranged corresponding to the guide slide column 14 .

[0032] Specifically, see Figure 5and Figure 8 In this embodiment, a connecting column 22 is fixedly provided in the middle of the bottom wall of the sieve drum 5, a connecting frame 23 is fixedly provided on the connecting column 22, a scraper 24 is fixedly installed on the connecting frame 23, and the scraper 24 is in contact with the inner bottom wall of the outer shell 1. When the sieve drum 5 rotates, the scraper 24 is driven to rotate by the connecting column 22 and the connecting frame 23. The rotating scraper 24 can improve the efficient discharge of the screened polyester resin particles for powder coating. The vertical support column 12 passes through the connecting column 22 and extends into the sieve drum 5. During specific operation, the connecting column 22 rotates with the sieve drum 5, and the vertical support column 12 is fixedly arranged, thereby ensuring that only the vertical position movement is performed between the first magnet 6 and the second magnet 10.

[0033] Specifically, see Figure 5 and Figure 8 In this embodiment, a crushing motor 25 is fixed on the fixed frame 11, and the output shaft of the crushing motor 25 passes through the middle of the vertical support column 12 and the horizontal support plate 13 in sequence and extends into the screen drum 5. A crushing blade 26 is fixed on the output shaft of the crushing motor 25. Under the action of the rotating crushing blade 26, the polyester resin particles in the screen drum 5 can be crushed, so that the block-shaped and large-granular polyester resin particles can be processed into powder coatings of the required fineness and particle size, and are smoothly sieved through the screen drum 5 under the action of centrifugal force.

[0034] Specifically, see Figure 1 , Figure 2 , Figure 4 and Figure 5 In this embodiment, a discharge pipe 2 is provided on the bottom wall of the shell 1, and a blocking drive shaft 3 is rotatably provided in the discharge pipe 2. A blocking plate 4 is fixedly connected to the blocking drive shaft 3 through a connecting plate. The blocking plate 4 is configured to be driven by the blocking drive shaft 3 to slide against the inner wall of the discharge pipe 2, and the blocking plate 4 is used to block the outlet of the discharge pipe 2. When the blocking plate 4 blocks the outlet of the discharge pipe 2, the polyester resin particles for powder coating are kept in the shell 1. When the blocking plate 4 is removed from the outlet of the discharge pipe 2, the polyester resin particles for powder coating that have been sieved in the shell 1 are discharged; the middle part of the discharge pipe 2 is a spherical body, and the blocking plate 4 is a spherical crown. A motor seat plate 27 is fixedly provided on the bottom wall of the shell 1, and a blocking motor 28 is fixedly provided on the motor seat plate 27. The blocking drive shaft 3 is connected to the output shaft of the blocking motor 28, and the blocking drive shaft 3 is driven to rotate under the action of the blocking motor 28, and the blocking drive shaft 3 drives the blocking plate 4 to adjust its position relative to the opening of the discharge pipe 2.

[0035] Specifically, see Figure 1-Figure 4 and Fig. 9In the present embodiment, since the polyester resin particles processed into powder coating are in powder form, dust will be generated during manual packaging. Therefore, in the present embodiment, a transfer mechanism is provided below the outer shell 1, and the polyester resin particles for powder coating that have been screened are automatically packaged in cooperation with the sealing plate 4. The transfer mechanism includes a transfer component and a placement table 29. The placement table 29 is fixedly provided on the transfer component. Two groups of placement tables 29 are provided on the transfer component. The two groups of placement tables 29 are placed under the discharge pipe 2 in turn. A packing box 30 is detachably provided on the placement table 29. The packing box 30 is an existing packing box 30 for powder coating. A packing bag is set inside the packing box 30, and the powder coating is packaged by the packing bag and the packing box 30.

[0036] Specifically, see Figure 1-Figure 4 In this embodiment, the transfer assembly includes a support seat 31, a transfer screw 32, a transfer slide 33 and a transfer motor 34. The transfer screw 32 is rotatably arranged on the support seat 31, the transfer motor 34 is fixedly arranged on the support seat 31, the transfer screw 32 is fixedly connected to the output shaft of the transfer motor 34, the transfer slide 33 is fixedly arranged on the support seat 31, and a transfer plate 35 is threadedly connected to the transfer screw 32. The transfer plate 35 is slidably arranged on the transfer slide 33. The position adjustment of the transfer plate 35 can be achieved under the driving action of the transfer screw 32 and the guiding action of the transfer slide 33.

[0037] Specifically, see Fig. 9 and Fig.10 In this embodiment, a lifting cylinder 36 is provided on the upper surface of the transfer plate 35, and the placement platform 29 is fixedly connected to the free end of the lifting cylinder 36. Two groups of lifting cylinders 36 and the placement platform 29 are correspondingly provided. Under the action of the lifting cylinder 36, the position of the packaging box 30 relative to the outlet of the discharge pipe 2 is adjusted. A fixed cavity 37 is provided in the placement platform 29, and a fixed motor 38 is fixedly provided on the bottom wall of the fixed cavity 37. Two groups of bidirectional screws 39 are rotatably provided on the inner wall of the fixed cavity 37. A belt pulley is fixedly provided in the middle of the bidirectional screw 39 and the output shaft of the fixed motor 38, and a synchronous belt 40 is sleeved on the belt pulley. Under the action of the belt 40, the fixed motor 38 drives the bidirectional screw 39 to rotate. The two ends of the bidirectional screw 39 are respectively connected to the driving plates 41 through threads. A driving column 42 is fixed on the driving plate 41. The driving column 42 is slidably set on the side wall of the fixed cavity 37. The free end of the driving column 42 is fixed with a fixed clamping plate 43. The fixed clamping plate 43 is used to fix the packaging box 30. Under the action of the bidirectional screw 39, the fixed clamping plate 43 is driven to move relative to the packaging box 30 through the driving plate 41 and the driving column 42. When the fixed clamping plate 43 is close to the fixed box, the fixed box is clamped and fixed, so that the fixed box moves synchronously with the placement table 29.

[0038] Specifically, see Figure 3In this embodiment, a weighing scale 44 is installed on the upper surface of the placement table 29, and the weighing scale 44 is electrically connected to the blocking motor 28. When the weight of the packaging box 30 weighed by any group of weighing scales 44 reaches the set weight, the blocking plate 4 driven by the blocking motor 28 blocks the outlet of the discharge pipe 2.

[0039] Specifically, see Figure 4 and Figure 5 In this embodiment, since the polyester resin particles are processed into powder, in order to avoid dust generation when the powder coating falls and is packaged, a cover plate 45 is fixedly provided at the lower end of the discharge pipe 2. The size of the cover plate 45 is not less than the opening size of the packaging box 30. The position of the packaging box 30 relative to the cover plate 45 is adjusted under the action of the lifting cylinder 36. When the powder coating in the shell 1 falls and is packaged into the packaging box 30, the cover plate 45 is adjusted to seal the opening of the packaging box 30.

[0040] The present embodiment provides a screening device for controlling polyester resin particles for powder coatings, and its working principle is as follows: (1) In the initial state, a group of packaging boxes 30 are stably located below the outlet of the discharge pipe 2 under the action of the fixed clamping plate 43, and the cover plate 45 contacts the upper end of the packaging box 30 under the action of the lifting cylinder 36, and the cover plate 45 seals the upper end opening of the packaging box 30. At the same time, the blocking plate 4 is moved away from the outlet of the discharge pipe 2 and fits with the inner wall of the discharge pipe 2. There is a channel for powder coating to be discharged between the blocking plate 4 and the side wall of the discharge pipe 2; (2) The polyester resin particles for powder coating to be screened are added from the feed hopper 17 into the sieve drum 5. During the feeding process, the drive motor 15 is synchronously started. The drive motor 15 drives the active bevel gear 16 to rotate. The active bevel gear 16 meshes with the driven bevel gear 18 to drive the feed hopper 17 and the sieve drum 5 to rotate. The sieve drum 5 rotates under the action of centrifugal force to efficiently screen the polyester resin particles for powder coating. The screened polyester resin particles for powder coating fall into the housing 1. In the screening process, the connection column 22 drives the scraper 24 to scrape the powder coating on the bottom wall of the housing 1 through the connection, so as to promote the discharge of the powder coating through the outlet of the discharge pipe 2 and collect it in the packaging box 30. During the screening process, the crushing motor 25 drives the crushing blade 26 to rotate, and the crushing blade 26 crushes the large particles that have not been successfully screened out; (3) When the feed hopper 17 rotates, the transmission bevel gear 20 is driven to rotate. The transmission bevel gear 20 meshes with the driving bevel gear 21 to drive the rotating shaft 9 to rotate. The rotating shaft 9 drives the second magnet 10 to rotate, thereby adjusting the magnetic pole of the second magnet 10 facing the end of the first magnet 6. When the magnetic poles of the second magnet 10 facing the first magnet 6 are the same, a repulsive force is generated between the two, and the first magnet 6 rises along the guide slide 14. When the magnetic poles of the second magnet 10 facing the first magnet 6 are opposite, an attractive force is generated between the two, and the first magnet 6 descends along the guide slide 14. During the rising and falling process of the first magnet 6, the cleaning plate 7 and the cleaning brush 8 are driven to rise and fall relative to the screen drum 5, thereby cleaning the side wall of the screen drum 5 to prevent the powder coating from adhering to the side wall of the screen drum 5, thereby ensuring the screening efficiency; (4) When the weight of the powder coating in the packaging box 30 reaches the set value, the weighing scale 44 transmits a signal to the blocking motor 28, and the blocking motor 28 drives the blocking plate 4 to rotate 90° counterclockwise through the rotating shaft 9. The blocking plate 4 rotates to the outlet of the discharge pipe 2 to block the outlet of the discharge pipe 2, and no more material is discharged at this time; (5) The lifting cylinder 36 drives the packaging box 30 containing the powder coating away from the cover plate 45, and the transfer motor 34 is started. The transfer motor 34 drives the transfer screw 32 to rotate. Under the guidance of the transfer slide bar 33, the transfer screw 32 drives the transfer plate 35 to move. The transfer plate 35 drives the packaging box 30 to move through the placement table 29. The packaging box 30 containing the powder coating moves away from under the discharge pipe 2. At this time, another group of packaging boxes 30 just moves to under the discharge pipe 2, and the upper edge of the packaging box 30 of this group is driven to fit with the cover plate 45 by the lifting cylinder 36. (6) The fixed motor 38 in the corresponding placement table 29 of the packaging box 30 containing the powder coating is started to rotate forward. Under the action of the synchronous belt 40, the fixed motor 38 drives the bidirectional screw 39 to rotate. Under the driving action of the bidirectional screw 39, the driving plate 41 drives the two groups of fixed clamping plates 43 to move away from each other through the driving column 42, thereby releasing the fixation of the group of packaging boxes 30, and removing the packaging box 30 containing the powder coating from the placement table 29. At this time, the weighing scale 44 detects that there is no corresponding pressure on the two placement tables 29. The blocking motor 28 drives the blocking plate 4 to rotate 90° clockwise through the rotating shaft 9, and the outlet of the discharge pipe 2 is opened again to discharge and package the material into another group of packaging boxes 30. During the process of unloading and packaging, the new packaging box 30 is placed on the empty placement table 29 again, and the fixed motor 38 corresponding to the group of placement tables 29 is started to reverse, and the new packaging box 30 is fixed, waiting for the next powder material to be loaded.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, material or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, material or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A screening device for controlling polyester resin particles for powder coatings, characterized in that: include: Housing (1); A sieve drum (5) is arranged in the housing (1), and the sieve drum (5) is configured to be rotatable; A support frame, the support frame being fixedly arranged in the outer shell (1), the upper portion of the support frame extending into the screen drum (5); Wherein, a first magnet (6) is slidably provided on the support frame, a cleaning plate (7) is fixedly provided at one end of the first magnet (6) facing the side wall of the screen drum (5), and a cleaning brush (8) is installed on the cleaning plate (7); A rotating shaft (9) is rotatably provided on the inner top wall of the shell (1), and a second magnet (10) is fixedly provided on the rotating shaft (9). The magnetic poles at both ends of the second magnet (10) are opposite to each other. The second magnet (10) is driven by the rotating shaft (9) to change the magnetic pole toward the first magnet (6). The first magnet (6) is lifted and slid along the support frame due to the magnetic attraction and magnetic repulsion of the second magnet (10). When the first magnet (6) is lifted and slid, it drives the cleaning brush (8) to clean the side wall of the screen drum (5).

2. The screening device for controlling polyester resin particles for powder coatings according to claim 1, characterized in that: The support frame comprises a fixed frame (11), a vertical support column (12), a transverse support plate (13) and a guide slide column (14); the fixed frame (11) is fixedly mounted on the bottom wall of the housing (1); the vertical support column (12) is fixedly mounted on the fixed frame (11); the middle portion of the transverse support plate (13) is fixedly connected to the upper end of the vertical support column (12); the transverse support plate (13) is located in the screen drum (5); the guide slide column (14) is vertically mounted on the transverse support plate (13); and the first magnet (6) is slidably mounted on the guide slide column (14); Two guide slide posts (14) are provided, and the first magnet (6) is slidably arranged on the two groups of guide slide posts (14).

3. The screening device for controlling polyester resin particles for powder coatings according to claim 1, characterized in that: A driving motor (15) is fixedly provided on the top wall of the housing (1), an active bevel gear (16) is fixedly provided on the output shaft of the driving motor (15), a feed hopper (17) is rotatably provided on the top wall of the housing (1), the screen drum (5) is fixedly connected to the lower end of the feed hopper (17), a driven bevel gear (18) is fixedly provided on the feed hopper (17), and the driven bevel gear (18) is meshed with the active bevel gear (16); A shaft seat (19) is fixedly provided on the inner top wall of the housing (1), the rotating shaft (9) is rotatably provided on the shaft seat (19), a transmission bevel gear (20) is fixedly provided on the feed hopper (17), a driving bevel gear (21) is fixedly provided on the rotating shaft (9), and the driving bevel gear (21) is meshed with the transmission bevel gear (20).

4. The screening device for controlling polyester resin particles for powder coatings according to claim 2, characterized in that: A connecting column (22) is fixedly provided at the middle of the bottom wall of the sieve cylinder (5), a connecting frame (23) is fixedly provided on the connecting column (22), a scraper (24) is fixedly mounted on the connecting frame (23), the scraper (24) is in contact with the inner bottom wall of the outer shell (1), and the vertical support column (12) passes through the connecting column (22) and extends into the sieve cylinder (5).

5. The screening device for controlling polyester resin particles for powder coatings according to claim 2, characterized in that: A pulverizing motor (25) is fixedly mounted on the fixed frame (11), and an output shaft of the pulverizing motor (25) sequentially passes through the middle of the vertical support column (12) and the horizontal support plate (13) and extends into the screen drum (5). A pulverizing blade (26) is fixedly mounted on the output shaft of the pulverizing motor (25).

6. The screening device for controlling polyester resin particles for powder coatings according to claim 1, characterized in that: A discharge pipe (2) is provided on the bottom wall of the housing (1), a plugging drive shaft (3) is rotatably provided in the discharge pipe (2), a plugging plate (4) is fixedly connected to the plugging drive shaft (3) via a connecting plate, the plugging plate (4) is configured to be driven by the plugging drive shaft (3) to slide against the inner wall of the discharge pipe (2), and the plugging plate (4) is used to plug the outlet of the discharge pipe (2); The middle part of the discharge pipe (2) is a spherical body, the blocking plate (4) is in the shape of a spherical crown, a motor base plate (27) is fixedly provided on the bottom wall of the housing (1), a blocking motor (28) is fixedly provided on the motor base plate (27), and the blocking drive shaft (3) is connected to the output shaft of the blocking motor (28).

7. The screening device for controlling polyester resin particles for powder coatings according to claim 6, characterized in that: A transfer mechanism is provided below the shell (1), the transfer mechanism comprising a transfer assembly and a placement table (29), the placement table (29) being fixedly provided on the transfer assembly, two groups of the placement tables (29) being provided on the transfer assembly, the two groups of the placement tables (29) being placed in turn below the discharge pipe (2), and a packaging box (30) being detachably provided on the placement table (29).

8. The screening device for controlling polyester resin particles for powder coatings according to claim 7, characterized in that: The transfer assembly comprises a support seat (31), a transfer screw (32), a transfer slide bar (33) and a transfer motor (34); the transfer screw (32) is rotatably mounted on the support seat (31); the transfer motor (34) is fixedly mounted on the support seat (31); the transfer screw (32) is fixedly connected to an output shaft of the transfer motor (34); the transfer slide bar (33) is fixedly mounted on the support seat (31); a transfer plate (35) is threadedly connected to the transfer screw (32); and the transfer plate (35) is slidably mounted on the transfer slide bar (33).

9. The screening device for controlling polyester resin particles for powder coatings according to claim 8, characterized in that: A lifting cylinder (36) is provided on the upper surface of the transfer plate (35); the placement platform (29) is fixedly connected to the free end of the lifting cylinder (36); two groups of the lifting cylinder (36) and the placement platform (29) are provided correspondingly; a fixed cavity (37) is provided inside the placement platform (29); a fixed motor (38) is fixedly provided on the bottom wall of the fixed cavity (37); two groups of bidirectional screws (39) are rotatably provided on the inner wall of the fixed cavity (37); the middle part of the bidirectional screws (39) is connected to the fixed A belt pulley is fixedly provided on the output shaft of the fixed motor (38), a synchronous belt (40) is sleeved on the belt pulley, two ends of the bidirectional screw (39) are respectively connected to a driving plate (41) by threads, a driving column (42) is fixedly provided on the driving plate (41), the driving column (42) is slidably provided on the side wall of the fixed cavity (37), a fixed clamping plate (43) is fixedly provided on the free end of the driving column (42), and the fixed clamping plate (43) is used to fix the packaging box (30); A weighing scale (44) is installed on the upper surface of the placement table (29), and the weighing scale (44) is electrically connected to the blocking motor (28).

10. The screening device for controlling polyester resin particles for powder coatings according to claim 7, characterized in that: A cover plate (45) is fixedly provided at the lower end of the discharge pipe (2), and the size of the cover plate (45) is not less than the size of the opening of the packaging box (30).

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