Waste PCB copper powder extraction device

Abstract

The utility model provides a waste PCB (printed circuit board) copper powder extraction device which comprises a sorting box, and a separation assembly used for separating and extracting copper powder in crushed waste PCB particles is arranged in the sorting box. The vibrating dispersion base disperses and guides falling waste PCB particles, meanwhile, the working electric heating piece can heat the upper end face of the dispersion base, so that the upper end face of the dispersion base and part of moisture on the surfaces of the waste PCB particles making contact with the dispersion base are heated and dehumidified, and a low-speed motor drives a first electrostatic roller to rotate through a driving supporting shaft; and meanwhile, the driving supporting shaft can drive the driven supporting shaft to rotate synchronously through the driving belt wheel, the transmission belt and the driven belt wheel, so that the driven supporting shaft drives the second electrostatic roller to rotate together, and the first electrostatic roller and the second electrostatic roller which rotate synchronously in the same direction can separate and extract the copper powder in the sliding waste PCB particles for multiple times.

Description

Technical Field

[0001] The utility model relates to the technical field of copper powder extraction from PCB boards, in particular to a device for extracting copper powder from waste PCB boards. Background Art

[0002] PCB is a printed circuit board, also known as a printed circuit board. It is an important electronic component, a support for electronic components, and a carrier for electrical connections of electronic components. Because it is made using electronic printing technology, it is called a "printed" circuit board and is widely used in various electronic devices. With the increasing demand for PCB boards, a large number of waste PCB boards will be generated during the production and use process. Waste PCB boards contain a large amount of copper. In order to reduce environmental pollution and recycle the copper in PCB boards, an electrostatic separator is needed to separate the conductive material (copper powder) from the non-conductive material through high-voltage static electricity, so as to separate the metal (copper powder) from the non-metal in the waste circuit boards and extract them for reuse.

[0003] Publication No. "CN 219985026 U" provides an electrostatic screening copper powder equipment, which is equipped with a screening box, a servo motor, a transmission shaft, an electrostatic roller, a collecting box, a guide seat, a copper powder guide trough, a storage box, a control panel and a scraper. It can effectively and thoroughly screen the crushed materials mixed with copper powder, fully separate the copper powder and copper chips in the materials, so as to recover the copper powder, improve the recovery rate of the copper powder, and effectively solve the problems and shortcomings of the existing equipment.

[0004] However, the above technical solutions and the prior art have the following defects:

[0005] Although the electrostatic screening copper powder equipment can separate the copper powder and copper chips in the material for recycling, it only relies on a set of electrostatic rollers for electrostatic separation in actual use. It cannot fully separate and extract the copper powder in the material. Therefore, the staff is required to pour the separated non-metallic particles back into the electrostatic screening ventilation equipment for secondary separation. Not only is the separation effect poor, but it also increases the labor intensity of the staff. In addition, the feed hopper in the electrostatic screening copper powder equipment does not have the ability to disperse and heat the material, which makes it easy for the material entering the screening box to accumulate. The accumulated material will again affect the electrostatic separation effect of the electrostatic roller. At the same time, if the moisture adhering to the surface of the material is too heavy, it will also affect the electrostatic separation effect of the electrostatic roller. Utility Model Content

[0006] The purpose of the utility model is to provide a device for extracting copper powder from waste PCB boards to solve the problems raised in the above-mentioned background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A device for extracting copper powder from waste PCB boards comprises a sorting box, a feeding hopper, supporting legs and a collecting box, wherein the bottom of the sorting box is fixedly connected to the supporting legs, the middle position of the upper end surface of the sorting box is fixedly connected to the feeding hopper, collecting boxes are placed on both the front and rear sides of the sorting box, a separation component for separating and extracting copper powder from crushed waste PCB board particles is arranged inside the sorting box, and a dispersion component for dispersing and heating the input waste PCB board particles is arranged inside the feeding hopper.

[0009] Preferably, the separation component includes a diverter seat, a first electrostatic roller, an active support shaft, a first guide drop inclined plate, a first silicone scraper and a first support beam. A low-speed motor is installed on the upper side of the left end surface of the sorting box, and the right end of the low-speed motor is connected to the active support shaft. The first electrostatic roller is arranged on the annular side of the active support shaft. A first support beam is installed on the front side of the sorting box, and a first silicone scraper is installed on the rear end of the first support beam. The first guide drop inclined plate is fixedly connected to the upper side of the inner wall of the sorting box, and the diverter seat is fixedly connected to the lower side of the inside of the sorting box.

[0010] Preferably, a driving pulley is provided on the right side of the annular side of the active support shaft, a driven support shaft is installed on the lower side of the inner part of the sorting box, a second electrostatic roller is provided on the annular side of the driven support shaft, a driven pulley is provided on the right side of the annular side of the driven support shaft, and a transmission belt is provided between the driven pulley and the driving pulley.

[0011] Preferably, the dispersion assembly includes a dispersion seat, a vibration motor, an electric heater, a bottom sealing plate and a support rod. The dispersion seat is installed on the lower side of the inside of the feeding hopper, support rods are symmetrically installed on the left and right end surfaces of the dispersion seat, a bottom sealing plate is installed at the bottom of the dispersion seat, a vibration motor is installed in the middle position of the lower end surface of the bottom sealing plate, and an electric heater is pasted on the upper side of the inner wall of the dispersion seat.

[0012] Preferably, a second support beam is installed in front of the second electrostatic roller, a second silicone scraper is installed at the rear end of the second support beam, and a second guide inclined plate is fixedly connected to the inside of the sorting box.

[0013] Preferably, a front discharge shell is fixedly connected to the lower side of the front end surface of the sorting box, and the front discharge shell is communicated with the sorting box, a rear discharge shell is fixedly connected to the lower side of the rear end surface of the sorting box, and the rear discharge shell is communicated with the sorting box, a through cavity is opened in the middle position of the upper end surface of the sorting box, a control panel is installed on the upper side of the rear end surface of the sorting box, and an inspection panel is installed on the front end surface of the sorting box.

[0014] Preferably, the right ends of the driven support shaft and the active support shaft are both equipped with electric slip rings, the left end of the driven support shaft is provided with a limit plate, and the left side of the inner wall of the sorting box is equipped with a limit stop ring.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. After the waste PCB particles slide into the sorting box, the low-speed motor will drive the first electrostatic roller to rotate through the active support shaft, and at the same time, the active support shaft will drive the driven support shaft to rotate synchronously through the active pulley, the transmission belt and the driven pulley, so that the driven support shaft drives the second electrostatic roller to rotate together, so that the first electrostatic roller and the second electrostatic roller rotating synchronously in the same direction use the electrostatic adsorption principle to adsorb the copper powder in the waste PCB particles that slide down for multiple times, so as to separate the copper powder in the waste PCB particles, and the separation effect is good;

[0017] 2. After the crushed waste PCB board particles are poured into the feeding hopper, the vibration motor will vibrate the dispersion seat through the bottom sealing plate, so that the vibrating dispersion seat can disperse and guide the fallen waste PCB board particles. At the same time, the working electric heater will heat the upper end surface of the dispersion seat, so as to heat and dehumidify part of the moisture on the surface of the waste PCB board particles in contact with the upper end surface of the dispersion seat, so as to avoid the waste PCB board particles entering the sorting box from being over-humidified and over-accumulated, so as to ensure the separation component to separate the copper powder from the waste PCB board particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 It is a right side cross-sectional view of the separation component and the dispersion component in the utility model;

[0020] Figure 3 It is a partial structural diagram of the separation component in the utility model;

[0021] Figure 4 It is a front cross-sectional view of the separation component and the dispersion component in the utility model;

[0022] Figure 5 It is a structural diagram of the dispersed components in the utility model.

[0023] In the figure: 1, sorting box; 11, inspection panel; 12, control panel; 13, through cavity; 14, limit ring; 2, separation assembly; 21, rear discharge shell; 22, diverter seat; 23, second electrostatic roller; 24, driven support shaft; 241, limit plate; 25, first electrostatic roller; 26, active support shaft; 27, first guide inclined plate; 28, first silicone scraper; 29, first support beam; 211, second The guide inclined plate; 212, the second support beam; 213, the second silicone scraper; 214, the low-speed motor; 215, the driven pulley; 216, the driving pulley; 217, the transmission belt; 218, the electric slip ring; 219, the front discharge shell; 3, the feeding hopper; 4, the dispersion component; 41, the dispersion seat; 42, the vibration motor; 43, the electric heating plate; 44, the bottom sealing plate; 45, the support rod; 5, the support leg; 6, the collection box. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-5 , the utility model provides a technical solution:

[0026] Embodiment 1:

[0027] A device for extracting copper powder from waste PCB boards comprises a sorting box 1, a feeding hopper 3, a support leg 5 and a collecting box 6. The bottom of the sorting box 1 is fixedly connected with the support leg 5, and the bottom of the support leg 5 is fixed to the external ground through external expansion bolts. The support leg 5 supports and fixes the sorting box 1. The middle position of the upper end surface of the sorting box 1 is fixedly connected with the feeding hopper 3. The feeding hopper 3 facilitates the staff to pour the crushed waste PCB board particles into the sorting box 1. The collecting boxes 6 are placed on both the front and rear sides of the sorting box 1. The collecting boxes 6 are placed with two groups, and the two groups of collecting boxes are placed in the collecting boxes. The collecting boxes 6 have the same specifications. The two groups of collecting boxes 6 are convenient for collecting the materials discharged from the front discharge shell 219 and the rear discharge shell 21. An inspection panel 11 is installed on the front end face of the sorting box 1. The inspection panel 11 is a detachable structure. The detachable inspection panel 11 facilitates the later work principle to inspect and maintain the inside of the sorting box 1. A separation component 2 for separating and extracting copper powder from the crushed waste PCB board particles is arranged inside the sorting box 1, and a dispersion component 4 for dispersing and heating the input waste PCB board particles is arranged inside the feeding hopper 3.

[0028] The separation component 2 includes a diverter seat 22, a first electrostatic roller 25, an active support shaft 26, a first guide inclined plate 27, a first silicone scraper 28 and a first support beam 29. A low-speed motor 214 is installed on the upper side of the left end surface of the sorting box 1. The low-speed motor 214 is connected to the control panel 12 through a wire. The low-speed motor 214 will drive the active support shaft 26 to rotate at a low speed when working. The right end of the low-speed motor 214 is connected to the active support shaft 26, and the active support shaft 26 will drive the first electrostatic roller 25 to rotate. The first electrostatic roller 25 is arranged on the annular side of the active support shaft 26. The first electrostatic roller 25 and the active support shaft 26 are an integrated structure. The first electrostatic roller 25 is electrically connected to the electric slip ring 218 on the upper side through a wire. The first electrostatic roller 25 will form an electric charge when it is powered on, and according to the principle of electrostatic adsorption, it has Copper powder with complementary charge will be adsorbed on the annular side of the first electrostatic roller 25, while non-metallic particles without charge will not be adsorbed on the annular side of the first electrostatic roller 25, so as to classify and extract copper powder in the crushed waste PCB board particles. Since the internal detailed structure and working principle of the first electrostatic roller 25 are relatively mature technologies in the prior art, they will not be described in detail here. A first support beam 29 is installed on the front side of the sorting box 1, and the first support beam 29 will support the first silicone scraper 28. A first silicone scraper 28 is installed on the rear end of the first support beam 29. The first silicone scraper 28 is a detachable structure. The rear end face of the first silicone scraper 28 is in contact with the front side of the annular side of the first electrostatic roller 25. The first silicone scraper 28 will scrape off the copper powder adsorbed on the annular side of the first electrostatic roller 25.

[0029] A first guide falling inclined plate 27 is fixedly connected to the upper side of the inner wall of the sorting box 1. The first guide falling inclined plate 27 will guide the waste PCB board particles in the through cavity 13 to the rear side and fall on the rear side of the annular side of the first electrostatic roller 25. A diverter seat 22 is fixedly connected to the lower side of the interior of the sorting box 1. The diverter seat 22 is triangular in shape. The triangular diverter seat 22 will guide the separated copper powder and non-metallic particles to the front discharge shell 219 and the rear discharge shell 21 respectively. A driving pulley 216 is arranged on the right side of the annular side of the active support shaft 26. The active pulley 216 is connected to the active support shaft 26 by welding. The active pulley 216 will drive the driven pulley 215 to rotate through the transmission belt 217. A driven support shaft 24 is installed on the lower side of the interior of the sorting box 1. The driven support shaft 24 makes the rotation stability of the second electrostatic roller 23 better. The driven support shaft 24 is annular A second electrostatic roller 23 is arranged on the side, and the second electrostatic roller 23 is electrically connected to the electric slip ring 218 on the lower side through a wire. The second electrostatic roller 23 has the same specifications as the first electrostatic roller 25. The second electrostatic roller 23 will perform secondary separation and extraction on the waste PCB board particles when working. Since the working principle of the second electrostatic roller 23 is the same as that of the first electrostatic roller, no further details will be given here. A driven pulley 215 is arranged on the right side of the annular side of the driven support shaft 24, and the driven pulley 215 is connected to the driven support shaft 24 by welding. A transmission belt 217 is arranged between the driven pulley 215 and the driving pulley 216, and the driven pulley 215 will drive the driven support shaft 24 to rotate. A second support beam 212 is installed in front of the second electrostatic roller 23, and the second support beam 212 will support the second silicone scraper 213.

[0030] A second silicone scraper 213 is installed at the rear end of the second support beam 212. The second silicone scraper 213 is a detachable structure. The rear end face of the second silicone scraper 213 contacts the front side of the annular side of the second electrostatic roller 23. The second silicone scraper 213 will scrape off the copper powder adsorbed on the annular side of the second electrostatic roller 23. A second guide inclined plate 211 is fixedly connected inside the sorting box 1. The second guide inclined plate 211 will guide the copper powder scraped off by the first silicone scraper 28 downward to prevent the copper powder from falling on the second support beam 212 and the second silicone scraper 213. The front end face of the sorting box 1 A front discharge shell 219 is fixedly connected to the lower side, and the front discharge shell 219 is communicated with the sorting box 1. The front discharge shell 219 will guide the separated copper powder to the collection box 6 on the front side. A rear discharge shell 21 is fixedly connected to the lower side of the rear end surface of the sorting box 1, and the rear discharge shell 21 is communicated with the sorting box 1. The rear discharge shell 21 will guide the separated non-metallic waste PCB board particles to the collection box 6 on the rear side. A through cavity 13 is provided in the middle position of the upper end surface of the sorting box 1. The through cavity 13 facilitates the waste PCB board particles in the feeding hopper 3 to slide down into the sorting box 1.

[0031] A control panel 12 is installed on the upper side of the rear end surface of the sorting box 1. The control panel 12 is electrically connected to the electric slip rings 218 on the upper and lower sides through wires. The input end of the control panel 12 is connected to the external electrostatic generator through wires. The control panel 12 is convenient for the staff to control the low-speed motor 214, the vibration motor 42, the first electrostatic roller 25 and the second electrostatic roller 23 respectively. Since the internal detailed structure and working principle of the control panel 12 belong to the relatively mature technology in the prior art, they are not described in detail here. The right ends of the driven support shaft 24 and the active support shaft 26 are both installed with electric slip rings 218. The electric slip rings 218 facilitate the first and second electrostatic rollers 25 and 23 to be electrically connected to the control panel 12 for rotation. A limit plate 241 is set at the left end of the driven support shaft 24. The limit plate 241 is connected to the driven support shaft 24 by welding. A limit stop ring 14 is installed on the left side of the inner wall of the sorting box 1. The limit stop ring 14 and the limit plate 241 prevent the driven support shaft 24 from displacement or shaking during rotation.

[0032] Embodiment 2:

[0033] On the basis of the first embodiment, in this embodiment, the vibration motor 42 will vibrate the dispersion seat 41 through the bottom sealing plate 44, so that the vibrating dispersion seat 41 disperses and guides the fallen waste PCB board particles, and the working electric heater 43 will heat the upper end surface of the dispersion seat 41, so that the upper end surface of the dispersion seat 41 and the contacting waste PCB board particles on the surface of the heat dehumidification part of the moisture, to avoid the waste PCB board particles entering the sorting box 1 from being over-humidified and over-accumulated, thereby ensuring the separation component 2 to separate the copper powder of the waste PCB board particles.

[0034] The dispersion assembly 4 includes a dispersion seat 41, a vibration motor 42, an electric heater 43, a bottom sealing plate 44 and a support rod 45. The dispersion seat 41 is installed on the lower side of the inside of the feeding hopper 3. The dispersion seat 41 is connected to the support rod 45 by welding. The upper end face of the dispersion seat 41 is triangular. The dispersion seat 41 with a triangular upper end face will disperse and guide the waste PCB board particles poured into the feeding hopper 3 to the front and rear sides respectively to prevent the waste PCB board particles from piling up in the process of sliding downward. The left and right end faces of the dispersion seat 41 are symmetrically installed with support rods 45. The support rods 45 are a detachable structure, and the support rods 45 will support and fix the dispersion seat 41.

[0035] A bottom sealing plate 44 is installed at the bottom of the dispersion seat 41. The bottom sealing plate 44 is a detachable structure. The bottom sealing plate 44 not only supports the vibration motor 42, but also blocks the bottom of the dispersion seat 41. A vibration motor 42 is installed at the middle position of the lower end surface of the bottom sealing plate 44. The vibration motor 42 is connected to the control panel 12 through a wire. The vibration motor 42 drives the dispersion seat 41 to vibrate when working, so that the waste PCB board particles on the upper end surface of the dispersion seat 41 are dispersed and slide downward. An electric heating plate 43 is attached to the upper side of the inner wall of the dispersion seat 41. The electric heating plate 43 is connected to the external temperature controller through a wire. The electric heating plate 43 heats the upper end of the dispersion seat 41 when working, so that the waste PCB board particles in contact with the upper end surface of the dispersion seat 41 are heated to prevent the waste PCB board particles from being too wet and affecting the separation effect of the separation component 2.

[0036] Working principle: the staff first crushes the waste PCB boards from the outside with the help of external crushing equipment, and then respectively makes the low-speed motor 214, the electric heater 43, the vibration motor 42, the first electrostatic roller 25 and the second electrostatic roller 23 work, at this time, an appropriate amount of crushed waste PCB board particles can be poured into the feeding hopper 3. In this process, the vibration motor 42 will vibrate the dispersion seat 41 through the bottom sealing plate 44, so that the vibrating dispersion seat 41 can disperse and guide the waste PCB board particles poured into the feeding hopper 3. At the same time, the working electric heater 43 will heat the upper end surface of the dispersion seat 41, so that the upper end surface of the dispersion seat 41 and the contacted waste PCB board particles are heated and dehumidified to avoid excessive moisture affecting the subsequent electrostatic separation effect; the waste PCB board particles dispersed and guided down by the dispersion seat 41 are The PCB board particles will slide down to the rear side of the annular side of the first electrostatic roller 25 through the through cavity 13 and the first guide inclined plate 27 in turn. At this time, the first electrostatic roller 25 driven by the low-speed motor 214 through the active support shaft 26 to rotate and work at a low speed will adsorb the copper powder in the waste PCB board particles that slide down, and the non-metallic waste PCB board particles will continue to slide down to the annular side of the working second electrostatic roller 23 for secondary copper powder sorting. In this process, the active support shaft 26 will drive the driven support shaft 24 to rotate synchronously through the active pulley 216, the transmission belt 217 and the driven pulley 215, so that the driven support shaft 24 drives the second electrostatic roller 23 to rotate together, thereby making the first electrostatic roller 25 and the second electrostatic roller 23 rotate synchronously in the same direction (the rotation direction of the first electrostatic roller 25 and the second electrostatic roller 23 is in the same direction). Figure 2The copper powder scraped off will be concentratedly guided to the front discharge shell 219 by the second guide inclined plate 211 and the diverter seat 22, so that the front discharge shell 219 can concentrate the copper powder to the collection box 6 on the front side. At the same time, the non-metallic waste PCB board particles will fall downward and be concentratedly guided to the rear side by the dispersion seat 41 to the rear side discharge shell 21, so that the rear side discharge shell 21 can concentrate the copper powder to the collection box 6 on the rear side, so as to separate and extract the copper powder from the waste PCB board particles. After the separation is completed, the staff only needs to turn off the low-speed motor 214, the electric heater 43, the vibration motor 42, the first electrostatic roller 25 and the second electrostatic roller 23 respectively.

[0037] 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 device for extracting copper powder from waste PCBs, comprising a sorting box (1), a feeding hopper (3), a supporting leg (5) and a collecting box (6), characterized in that: The bottom of the sorting box (1) is fixedly connected to a support leg (5), the middle position of the upper end surface of the sorting box (1) is fixedly connected to a feeding hopper (3), and collection boxes (6) are placed on both the front and rear sides of the sorting box (1); The separation box (1) is provided with a separation component (2) for separating and extracting copper powder from the crushed waste PCB board particles, and the feeding hopper (3) is provided with a dispersion component (4) for dispersing and heating the input waste PCB board particles.

2. A waste PCB copper powder extraction device according to claim 1, characterized in that: The separation assembly (2) comprises a diverter seat (22), a first electrostatic roller (25), an active support shaft (26), a first guide drop inclined plate (27), a first silicone scraper (28) and a first support beam (29); a low-speed motor (214) is installed on the upper side of the left end surface of the sorting box (1); the right end of the low-speed motor (214) is connected to the active support shaft (26); the annular side surface of the active support shaft (26) is provided with a first electrostatic roller (25); the front side of the interior of the sorting box (1) is installed with a first support beam (29); the rear end of the first support beam (29) is installed with a first silicone scraper (28); the upper side of the inner wall of the sorting box (1) is fixedly connected with the first guide drop inclined plate (27); and the lower side of the interior of the sorting box (1) is fixedly connected with the diverter seat (22).

3. A waste PCB copper powder extraction device according to claim 2, characterized in that: A driving pulley (216) is arranged on the right side of the annular side of the active support shaft (26); a driven support shaft (24) is installed on the lower side of the interior of the sorting box (1); a second electrostatic roller (23) is arranged on the annular side of the driven support shaft (24); a driven pulley (215) is arranged on the right side of the annular side of the driven support shaft (24); and a transmission belt (217) is arranged between the driven pulley (215) and the active pulley (216).

4. A waste PCB copper powder extraction device according to claim 1, characterized in that: The dispersion assembly (4) comprises a dispersion seat (41), a vibration motor (42), an electric heater (43), a bottom sealing plate (44) and a support rod (45); the dispersion seat (41) is installed on the lower side of the inside of the feeding hopper (3); the support rods (45) are symmetrically installed on the left and right end surfaces of the dispersion seat (41); the bottom of the dispersion seat (41) is installed with a bottom sealing plate (44); the vibration motor (42) is installed at the middle position of the lower end surface of the bottom sealing plate (44); and the electric heater (43) is pasted on the upper side of the inner wall of the dispersion seat (41).

5. The device for extracting copper powder from waste PCB according to claim 3, characterized in that: A second support beam (212) is installed in front of the second electrostatic roller (23), a second silicone scraper (213) is installed at the rear end of the second support beam (212), and a second guide inclined plate (211) is fixedly connected inside the sorting box (1).

6. The device for extracting copper powder from waste PCB according to claim 1, characterized in that: A front discharge shell (219) is fixedly connected to the lower side of the front end surface of the sorting box (1), and the front discharge shell (219) is in communication with the sorting box (1); a rear discharge shell (21) is fixedly connected to the lower side of the rear end surface of the sorting box (1), and the rear discharge shell (21) is in communication with the sorting box (1); a through cavity (13) is provided in the middle of the upper end surface of the sorting box (1); a control panel (12) is installed on the upper side of the rear end surface of the sorting box (1); and an inspection panel (11) is installed on the front end surface of the sorting box (1).

7. The device for extracting copper powder from waste PCBs according to claim 3, characterized in that: The right ends of the driven support shaft (24) and the active support shaft (26) are both equipped with electric slip rings (218), the left end of the driven support shaft (24) is provided with a limit plate (241), and the left side of the inner wall of the sorting box (1) is equipped with a limit stop ring (14).

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