Plastic particle screening device
By designing a plastic particle screening device with integrated multi-stage screening function, the existing equipment covers a large area and is easy to introduce foreign matters, achieving efficient removal of impurities and improving product quality.
Patent Information
- Application Number
- CN202420953968.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-04-30
AI Technical Summary
The existing plastic particle screening equipment has a large number of equipment, a large area of land and easy introduction of foreign objects at the connection, resulting in product quality problems.
Design a plastic particle screening device that integrates powder, flakes, and continuous particle sieving equipment, including frames, cyclone separation components and vibrating screening components. The screen and cyclone separation components are used to achieve multi-stage screening to reduce the entry of foreign matter. .
Effectively remove impurities from powder, flakes, and continuous particle in plastic particles, reduce the number of equipment and floor area, avoid foreign matters entering, and improve product purity and quality.
Smart Images
Figure CN222473069U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of plastic screening, and more specifically, to a plastic particle screening device. Background Art
[0002] Plastic granules are usually obtained by extrusion, pelletization, cooling and screening. In the extrusion production process of plastic granules such as low-smoke halogen-free cable materials, the equipment can be normally pelletized, cooled and screened to obtain finished particles. Because of the screen changing operation, the melt pressure fluctuates after the screen changing. If the pressure is too small, the pellets will be in the form of flakes, accompanied by a large amount of powder. If the pressure is too high, the length of the particles after pelletizing will be too long, resulting in the presence of impurities such as powder, flakes, and connected particles in the cable granules. In order to ensure the purity and quality of the granules, the finished particles need to be screened. At present, the screening method used is: after the particles are cooled, they are air-selected to remove flakes and powder first; then they are screened to remove the remaining powder and connected particles; each screening step is equipped with corresponding screening equipment, the number of equipment is large, the floor space is large, and the connection parts of each equipment are easy to attract foreign matter, thus causing product quality problems. Utility Model Content
[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a plastic particle screening device that integrates powder, flake, and continuous particle screening equipment into one, occupies a small area, and prevents foreign matter from entering, thereby ensuring product quality.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:
[0005] Provided is a plastic particle screening device, comprising a frame, a cyclone separation component and a vibrating screening component installed on the frame, the vibrating screening component comprising a screen mesh having a powder screening section, a thin sheet screening section and a continuous particle screening section arranged in sequence along the advancing direction of the plastic particles, the aperture of the screen mesh of the powder screening section is larger than the diameter of the powder and smaller than the diameter of the plastic particles, a first material receiving tray is arranged below the powder screening section, the cyclone separation component is arranged above the thin sheet screening section, the aperture of the screen mesh of the continuous particle screening section is larger than the diameter of the plastic particles and smaller than the diameter of the continuous particle particles, and a second material receiving tray is arranged below the continuous particle screening section.
[0006] The utility model discloses a plastic particle screening device, in which plastic particles are transported forward on a screen, and successively pass through a powder screening section, a thin-sheet screening section and a continuous-particle screening section. In the powder screening section, since the aperture of the screen of the powder screening section is larger than the diameter of the powder and smaller than the diameter of the plastic particles, the powder falls into a first receiving tray; the plastic particles and the continuous-particles continue to move forward on the screen, and enter the thin-sheet screening section. In the thin-sheet screening section, since the mass of the thin sheets is lighter than that of the plastic particles, a cyclone separation component extracts the thin sheets; the plastic particles continue to move forward, and enter the continuous-particle screening section. Since the aperture of the screen of the continuous-particle screening section is larger than the diameter of the plastic particles and smaller than the diameter of the continuous-particles, the plastic particles fall from the screen holes to be collected in a second receiving tray, and the continuous-particles continue to move forward along the screen surface and are collected. The utility model integrates powder, flake and continuous particle screening equipment in one body, occupies a small area, effectively removes powder, flake and continuous particle impurities in plastic particles, avoids the entry of foreign matter at the connection of different functional equipment, ensures the purity and quality of plastic particles, and thus ensures product quality.
[0007] Furthermore, a screen cover is provided above the screen, a cavity is formed between the screen cover, the first receiving tray, and the second receiving tray, the cyclone separation assembly is connected to the cavity, and the screen cover is provided with a feed port connected to the cavity. A relatively closed space is formed between the screen cover, the first receiving tray, and the second receiving tray, thereby creating conditions for the cyclone separation to generate negative pressure, the material enters from the feed port, reciprocates on the screen, and the material is spread on the screen.
[0008] Furthermore, the cyclone separation assembly includes a support frame, a cyclone separator and a connecting pipe, the cyclone separator is installed on the support frame, the cyclone separator is provided with an air inlet at the top and a thin-sheet particle outlet at the bottom, and the cyclone separator is connected to the screen cover through a connecting pipe. The diameter of the thin sheet of the utility model is equal to or close to the diameter of the plastic particles, because of its small thickness and lighter weight, the thin sheet can be separated from the plastic particles by setting the size of the negative pressure generated.
[0009] Furthermore, a connected particle collecting section is connected in front of the connected particle screening section, and the connected particle collecting section includes a first conveying section whose width gradually decreases along the advancing direction of the connected particle and a first collecting section connected to the end of the first conveying section. The first conveying section gradually decreases in width along the advancing direction of the connected particle, so that the connected particle is collected while advancing and is collected by the first collecting section.
[0010] Furthermore, a soft curtain is provided at the connection between the continuous particle screening section and the first conveying part. The provision of the soft curtain can help to form a relatively closed cavity, while not affecting the conveying of the continuous particles from the continuous particle screening section to the first conveying part.
[0011] Furthermore, the aperture of the powder screening segment screen is equal to the aperture of the sheet screening segment screen. This arrangement facilitates the processing of the screen.
[0012] Furthermore, an elastic member is provided at the connection between the vibration screening assembly and the frame, and the provision of the elastic member can help to achieve the reciprocating vibration of the screen.
[0013] Furthermore, the second receiving tray is provided with a first outlet for outputting iron particles and a second outlet for outputting finished particles, the first outlet is connected to the second outlet, and an iron particle removal component is provided at the first outlet. The presence of iron particles in plastic particles will seriously threaten the processing safety of plastic particles, and the iron particle removal component is provided to remove iron particles in plastic particles to ensure the quality of plastic particles.
[0014] Furthermore, the iron particle removal assembly includes a drive motor installed on the second receiving tray, a magnetic roller connected to the output end of the drive motor and rotatably connected to the second receiving tray, and a brush for brushing iron particles off the surface of the magnetic roller is provided between the magnetic roller and the side wall of the first outlet. The drive motor drives the magnetic roller to rotate, and the iron particles are adsorbed on the surface of the magnetic roller during the rotation of the magnetic roller, thereby achieving the removal of iron particles.
[0015] Furthermore, the second receiving tray includes a second conveying portion and a second collecting portion which are connected to each other, the first outlet and the second outlet are both arranged at the second collecting portion, the end of the second conveying portion is connected to an inclined guide plate, and the end of the guide plate is arranged above the magnetic roller. The guide plate is used to guide the movement direction of the plastic particles to prevent the plastic particles which are not adsorbed by the magnetic roller from directly flowing to the second outlet.
[0016] Compared with the prior art, the beneficial effects of the utility model are:
[0017] The plastic particle screening device of the utility model integrates powder, flake and continuous particle screening equipment in one body, occupies a small area, effectively removes powder, flake and continuous particle impurities in plastic particles, avoids the entry of foreign matter at the connection of different functional equipment, ensures the purity and quality of plastic particles, and thus ensures product quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of a plastic particle screening device;
[0019] Figure 2 A structural diagram of the plastic particle screening device from another perspective
[0020] Figure 3 It is a schematic diagram of the structure of the screen of the plastic particle screening device;
[0021] Figure 4A schematic diagram of the structure of an iron particle removal component of a plastic particle screening device;
[0022] In the accompanying drawings: 1. frame; 2. cyclone separation component; 21. support frame; 22. cyclone separator; 23. connecting pipe; 24. exhaust port; 25. flake particle outlet; 26. rubber sleeve; 3. vibration screening component; 31. screen; 311. powder screening section; 312. flake screening section; 313. continuous particle screening section; 314. first conveying part; 315. first collecting part; 316. soft curtain; 32. vibration motor; 33. sieve cover; 34. feed port; 4. first receiving tray; 41. powder outlet; 5. second receiving tray; 51. first outlet; 52. second outlet; 53. second conveying part; 54. second collecting part; 55. guide plate; 6. iron particle removal component; 61. drive motor; 62. magnetic roller; 63. brush; 7. elastic member. DETAILED DESCRIPTION
[0023] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.
[0024] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0025] Embodiment 1
[0026] like Figures 1 to 3The first embodiment of the plastic particle screening device of the utility model is shown, which includes a frame 1, a cyclone separation component 2 and a vibration screening component 3 installed on the frame 1, the vibration screening component 3 includes a screen 31 with a powder screening section 311, a thin film screening section 312 and a continuous particle screening section 313 arranged in sequence along the forward direction of the plastic particles, the pore size of the screen 31 of the powder screening section 311 is larger than the diameter of the powder and smaller than the diameter of the plastic particles, a first receiving tray 4 is provided below the powder screening section 311, the cyclone separation component 2 is provided above the thin film screening section 312, the pore size of the screen 31 of the continuous particle screening section 313 is larger than the diameter of the plastic particles and smaller than the diameter of the continuous particles, and a second receiving tray 5 is provided below the continuous particle screening section 313. Among them, in order to facilitate the processing of the screen 31, the aperture of the screen 31 of the powder screening segment 311 in this embodiment is equal to the aperture of the screen 31 of the thin film screening segment 312, but the aperture setting of the screen 31 of the powder screening segment 311 and the aperture setting of the screen 31 of the thin film screening segment 312 are not limited to the present invention.
[0027] When this embodiment is implemented, the plastic particles are transported forward on the screen 31, and successively pass through the powder screening section 311, the thin film screening section 312 and the continuous particle screening section 313. In the powder screening section 311, since the aperture of the screen 31 of the powder screening section 311 is larger than the diameter of the powder and smaller than the diameter of the plastic particles, the powder falls into the first receiving tray 4; the plastic particles and the continuous particles continue to move forward on the screen 31 and enter the thin film screening section 312. In the thin film screening section 312, since the mass of the thin film is lighter than that of the plastic particles, the cyclone separation component 2 extracts the thin film; the plastic particles continue to move forward and enter the continuous particle screening section 313. Since the aperture of the screen 31 of the continuous particle screening section 313 is larger than the diameter of the plastic particles and smaller than the diameter of the continuous particles, the plastic particles fall from the screen holes to the second receiving tray 5 for collection, and the continuous particles continue to move forward along the surface of the screen 31 for collection. The plastic particles received by the second receiving tray 5 effectively remove powder and connected particles in the plastic particles, thereby ensuring the product quality of the plastic particles.
[0028] In this embodiment, the vibrating screening assembly 3 includes a screen 31, a first material receiving tray 4, a second material receiving tray 5, and a vibration motor 32 fixed to the first material receiving tray 4 or the second material receiving tray 5. The screen 31 vibrates reciprocatingly under the action of the vibration motor 32. The working principle is consistent with the working principle of the currently commercially available vibrating screen, which will not be elaborated here. The sum of the lengths of the first receiving tray 4 and the second receiving tray 5 is equal to the sum of the lengths of the powder screening section 311, the thin sheet screening section 312 and the continuous particle screening section 313. Since powder falls from the powder screening section 311, plastic particles fall from the continuous particle screening section 313, and no material falls or a small amount of powder falls from the thin sheet screening section 312, in this embodiment, the sum of the lengths of the powder screening section 311 and the thin sheet screening section 312 is equal to the length of the first receiving tray 4. A conical collecting hopper can be provided below the first receiving tray 4, and a powder outlet 41 is provided at the bottom of the collecting hopper. The length of the continuous particle screening section 313 is equal to the length of the second receiving tray 5. The first receiving tray 4 and the second receiving tray 5 can be provided as an integrated structure, and a partition plate is provided between the first receiving tray 4 and the second receiving tray 5 to prevent the powder in the first receiving tray 4 from contaminating the plastic particles in the second receiving tray 5. In addition, in this embodiment, an elastic member 7 is provided at the connection between the vibration screening assembly 3 and the frame 1 to help achieve the reciprocating vibration of the screen 31 and avoid damage to the equipment caused by rigid collision.
[0029] The diameter of the flakes formed in the pelletizing process is equal to or close to the diameter of the plastic particles. Because of its small thickness and lighter weight, the flakes can be separated from the plastic particles by setting the size of the negative pressure generated. The flakes in the plastic particles can be separated by cyclone separation. Cyclone separation uses the principle of negative pressure adsorption for separation. Only in a relatively sealed space can a better negative pressure separation effect be achieved. Therefore, in this embodiment, a screen cover 33 is provided above the screen 31, and a cavity is formed between the screen cover 33, the first receiving tray 4, and the second receiving tray 5. The cyclone separation component 2 is connected to the cavity, and the screen cover 33 is provided with a feed port 34 connected to the cavity. In this way, a relatively closed space is formed between the screen cover 33, the first receiving tray 4, and the second receiving tray 5, thereby creating conditions for the cyclone separation to generate negative pressure. In this embodiment, the negative pressure generated by the cyclone separation can act only on the thin-sheet screening section 312, or can act simultaneously on two or three sections among the powder screening section 311, the thin-sheet screening section 312, and the continuous particle screening section 313. When acting on two or three sections, the powder in the plastic particles on the powder screening section 311 and the powder in the plastic particles on the continuous particle screening section 313 are adsorbed, which can further improve the purity and quality of the plastic particles. Specifically, in this embodiment, the cyclone separation component 2 can be any vacuum forming device that can generate a negative pressure adsorption effect.
[0030] In order to collect the sieved connected particles, in this embodiment, a connected particle collection section is connected in front of the connected particle screening section 313, where the front refers to the advancing direction of the plastic particles. The connected particle collection section includes a first conveying section 314 whose width gradually decreases along the advancing direction of the connected particles and a first collecting section 315 connected to the end of the first conveying section 314. The first conveying section 314 gradually decreases in width along the advancing direction of the connected particles, so that the connected particles are collected while advancing and are collected by the first collecting section 315. Figure 3 In this embodiment, the first conveying part 314 can be tilted so that the first collecting part 315 is suspended. The first collecting part 315 is a cylindrical structure arranged at the end of the continuous particle collection section. A collecting bag can be arranged below the cylindrical structure to collect the continuous particles.
[0031] In order to realize the conveyance of the concatenated particles from the concatenated particle screening section 313 to the first conveying section 314, a conveying channel must be reserved at the connection between the two, but the reserved conveying channel will inevitably affect the sealing effect of the cavity and the effect of cyclone separation. In this embodiment, a soft curtain 316 is provided at the connection between the concatenated particle screening section 313 and the first conveying section 314. The soft curtain 316 is square and only the top is fixed. In this way, when the concatenated particles are conveyed from the concatenated particle screening section 313 to the first conveying section 314, the concatenated particles can lift the soft curtain 316, and when no concatenated particles pass through, the soft curtain 316 can play a certain sealing effect.
[0032] Embodiment 2
[0033] This embodiment is the second embodiment of the plastic particle screening device of the utility model. This embodiment is similar to the first embodiment, except that, in this embodiment, the cyclone separation assembly 2 includes a support frame 21, a cyclone separator 22 and a connecting pipe 23. The cyclone separator 22 is installed on the support frame 21. The cyclone separator 22 is provided with an air suction port 24 at the top and a flake particle outlet 25 at the bottom. The cyclone separator 22 is connected to the screen cover 33 through the connecting pipe 23. In order to ensure the relative sealing of the cavity, a rubber sleeve 26 is provided at the connection between the connecting pipe 23 and the screen cover 33 in this embodiment.
[0034] When this embodiment is implemented, the cyclone separator 22 is fixed on the support frame 21, and air is drawn through the exhaust port 24 to generate negative pressure in the cavity. The flakes are sucked into the cyclone separator 22, rotate downward in the cyclone separator 22, and are discharged through the flake particle outlet 25. A collection bag can be connected to the flake particle outlet 25 for collection.
[0035] Embodiment 3
[0036] This embodiment is the third embodiment of the plastic particle screening device of the utility model. This embodiment is similar to the first embodiment, except that: since the presence of iron particles in plastic particles will seriously threaten the processing safety of plastic particles, an iron particle removal component 6 is provided to remove iron particles in plastic particles, thereby ensuring the quality of plastic particles. Therefore, this embodiment also includes an iron particle removal component 6 for removing iron particles in plastic particles.
[0037] Specifically, Figure 4 As shown, the second receiving tray 5 is provided with a first outlet 51 for outputting iron particles and a second outlet 52 for outputting finished particles, the first outlet 51 and the second outlet 52 are connected, and the iron particle removal component 6 is arranged at the first outlet 51. Among them, one side wall of the first outlet 51 is a vertical side wall, and the other side wall is an inclined side wall; both side walls of the second outlet 52 are inclined side walls, wherein the inclination means that an angle is formed with the horizontal plane or the vertical plane.
[0038] The iron particle removal assembly 6 includes a driving motor 61 installed on the second receiving tray 5, a magnetic roller 62 connected to the output end of the driving motor 61 and rotatably connected to the second receiving tray 5, and a brush 63 for brushing iron particles from the surface of the magnetic roller 62 is provided between the magnetic roller 62 and the inner wall of the first outlet 51. The driving motor 61 drives the magnetic roller 62 to rotate, and the magnetic roller 62 adsorbs iron particles on the surface of the magnetic roller 62 during the rotation of the magnetic roller 62, thereby achieving the removal of iron particles. Wherein, the axial width of the magnetic roller 62 should be as close as possible to the width of the first outlet 51 without affecting the rotation of the magnetic roller 62, so as to avoid the plastic particles that have not been iron-removed by the magnetic roller 62 from flowing out of the first outlet 51 or the second outlet 52; in addition, the brush 63 can be a long strip structure, the width of the brush 63 is equal to the width of the first outlet 51, and it runs across the entire width direction of the first outlet 51, and one side of the brush 63 is fixed on the vertical side wall of the first outlet 51, and one side is tangent to the magnetic roller 62. The brush 63 of this embodiment may be made of a soft plastic structure, which may have a stronger scraping force, thereby quickly and effectively scraping off the iron particles from the surface of the magnetic roller 62 .
[0039] The second receiving tray 5 includes a second conveying portion 53 and a second collecting portion 54 which are connected to each other. The end of the second conveying portion 53 is connected to a guide plate 55 which is arranged obliquely. The end of the guide plate 55 is arranged above the magnetic roller 62. The second conveying portion 53 can be arranged obliquely so that the plastic particles can move forward to the second collecting portion 54 under the action of their own gravity. The first outlet 51 and the second outlet 52 are both arranged in the second collecting portion 54. The first outlet 51 is located between the second outlet 52 and the second conveying portion 53. The guide plate 55 is used to guide the movement direction of the plastic particles and guide the plastic particles to the surface of the magnetic roller 62 to avoid the situation that the plastic particles which are not adsorbed by the magnetic roller 62 directly flow to the second outlet 52. When the present embodiment is implemented, the magnetic roller 62 rotates clockwise to provide a force for the plastic particles to be transported to the second outlet 52. The end of the guide plate 55 is arranged above the magnetic roller 62. The combination of the two can make all the plastic particles flow smoothly to the second outlet 52 after iron removal by the magnetic roller 62.
[0040] Compared with the first or second embodiment, the present embodiment adds an iron particle removal component 6 for removing iron particles from the plastic particles, which can ensure the quality of the plastic particles and prevent the iron particles contained in the plastic particles from causing safety problems in the subsequent processing and molding of the plastic particles.
[0041] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0042] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.
Claims
1. A plastic particle screening device, characterized in that: The invention comprises a frame (1), a cyclone separation component (2) and a vibration screening component (3) installed on the frame (1); the vibration screening component (3) comprises a screen (31) having a powder screening section (311), a thin sheet screening section (312) and a continuous particle screening section (313) arranged in sequence along the advancing direction of the plastic particles; the pore size of the screen (31) of the powder screening section (311) is larger than the diameter of the powder and smaller than the diameter of the plastic particles; a first material receiving tray (4) is arranged below the powder screening section (311); the cyclone separation component (2) is arranged above the thin sheet screening section (312); the pore size of the screen (31) of the continuous particle screening section (313) is larger than the diameter of the plastic particles and smaller than the diameter of the continuous particle; and a second material receiving tray (5) is arranged below the continuous particle screening section (313).
2. The plastic particle screening device according to claim 1, characterized in that: A sieve cover (33) is provided above the sieve (31); a cavity is formed between the sieve cover (33), the first material receiving tray (4) and the second material receiving tray (5); the cyclone separation assembly (2) is in communication with the cavity; and the sieve cover (33) is provided with a feed port (34) in communication with the cavity.
3. The plastic particle screening device according to claim 2, characterized in that: The cyclone separator assembly (2) comprises a support frame (21), a cyclone separator (22) and a connecting pipe (23); the cyclone separator (22) is mounted on the support frame (21); the cyclone separator (22) is provided with an air suction port (24) at the top and a flake particle outlet (25) at the bottom; the cyclone separator (22) is connected to the screen cover (33) via the connecting pipe (23).
4. The plastic particle screening device according to claim 1, characterized in that: A connected particle collecting section is connected in front of the connected particle screening section (313), and the connected particle collecting section includes a first conveying section (314) whose width gradually decreases along the forward direction of the connected particles and a first collecting section (315) connected to the end of the first conveying section (314).
5. The plastic particle screening device according to claim 4, characterized in that: A soft curtain (316) is provided at the connection between the continuous particle screening section (313) and the first conveying section (314).
6. The plastic particle screening device according to claim 1, characterized in that: The aperture of the sieve (31) of the powder screening section (311) is equal to the aperture of the sieve (31) of the sheet screening section (312).
7. The plastic particle screening device according to claim 1, characterized in that: An elastic member (7) is provided at the connection between the vibration screening assembly (3) and the frame (1).
8. The plastic particle screening device according to any one of claims 1 to 7, characterized in that: The second receiving tray (5) is provided with a first outlet (51) for outputting iron particles and a second outlet (52) for outputting finished particles, the first outlet (51) is connected to the second outlet (52), and an iron particle removal component (6) is provided at the first outlet (51).
9. The plastic particle screening device according to claim 8, characterized in that: The iron particle removal component (6) comprises a driving motor (61) mounted on the second receiving tray (5), a magnetic roller (62) connected to the output end of the driving motor (61) and rotatably connected to the second receiving tray (5), and a brush (63) for brushing iron particles off the surface of the magnetic roller (62) is provided between the magnetic roller (62) and the side wall of the first outlet (51).
10. The plastic particle screening device according to claim 9, characterized in that: The second receiving tray (5) comprises a second conveying portion (53) and a second collecting portion (54) which are connected to each other, the first outlet (51) and the second outlet (52) are both arranged in the second collecting portion (54), and the end of the second conveying portion (53) is connected to an inclined guide plate (55), and the end of the guide plate is arranged above the magnetic roller (62).