Plastic powder separating device with multi-stage filtering function

Abstract

This invention discloses a plastic powder separation device with multi-stage filtration function, including a separation chamber and a feeding hopper installed at the upper end of the separation chamber. A discharge device is provided at the lower end of the separation chamber. A rotary material handling device is rotatably installed through the separation chamber. A housing is provided at the end of the rotary material handling device away from the separation chamber. A negative pressure fan is installed through the housing. When the negative pressure fan is working, a negative pressure is generated in the rotary material handling device, and the plastic powder particles located in the separation chamber are adsorbed by the negative pressure. A slot is provided on the back of the housing, through which a storage device for storing plastic powder slides in. This device adopts a combination of screening and air separation, which can effectively realize the screening of plastic powder particles.

Description

Technical Field

[0001] This invention relates to a plastic powder separation device with multi-stage filtration function. Background Technology

[0002] After plastic products are recycled, they are crushed by a pulverizer to obtain plastic powder particles. These plastic powder particles inevitably contain some particles that are too large, and these coarse particles need to be screened out before subsequent processing.

[0003] In existing technologies, the separation of plastic powder particles mainly employs two methods: air classification and sieving. Air classification uses wind power to separate particles; larger plastic powder particles are relatively heavier and therefore cannot be captured by air classification, while smaller particles can be captured. Sieving uses a screen with a fixed mesh size, and the plastic powder particles are forced through the screen by vibration or other means to achieve the purpose of sieving.

[0004] In the above technical solution, the sieve screening is a passive screening method with low screening efficiency. Furthermore, the sieve is always facing upwards on one side, and it cannot be cleared in time after being blocked by coarse particles, resulting in increasingly lower screening efficiency until manual cleaning is required.

[0005] During air separation, plastic powder particles may clump together due to static electricity and other reasons, making it impossible to separate the fine powder particles.

[0006] Based on the above problems, we designed a plastic powder separation device with multi-stage filtration function that combines screening and air separation to effectively separate plastic powder particles. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a plastic powder separation device with multi-stage filtration function that combines screening and air separation to effectively screen plastic powder particles.

[0008] To solve the above problems, the present invention adopts the following technical solution: A plastic powder separation device with multi-stage filtration function includes a separation chamber and a feed hopper installed at the upper end of the separation chamber. A discharge device is provided at the lower end of the separation chamber. A rotary material handling device is rotatably installed through the separation chamber. A housing is provided at the end of the rotary material handling device away from the separation chamber. A negative pressure fan is installed through the housing. When the negative pressure fan is working, a negative pressure is generated in the rotary material handling device, and the plastic powder particles located in the separation chamber are adsorbed by the negative pressure. A slot is provided on the back of the housing, and a storage device for storing plastic powder slides in through the slot.

[0009] Preferably, the separation chamber includes a cylindrical chamber body with an end cap at one end. The chamber body includes a small-diameter portion and a large-diameter portion. A connecting pipe is provided at the top of the small-diameter portion, which connects to the feed hopper. A shaft tube is provided at the axial center of the end of the chamber body away from the end cap. The rotary material handling device is inserted into the chamber body through the shaft tube. The discharge device is installed at the bottom of the large-diameter portion.

[0010] Preferably, the discharge device includes a discharge pipe welded to the bottom of the large-diameter portion and communicating with the inner cavity of the hopper. An electric push rod is installed at the bottom of the discharge pipe, and a sliding rod is connected to the telescopic end of the electric push rod. The sliding rod slides along the axis of the discharge pipe. A discharge port is provided at the upper part of the outer wall of the discharge pipe. A slider is provided at the upper end of the sliding rod. The slider fits into the inner wall of the discharge rod. An arc-shaped fitting groove is machined on the top of the slider. When the electric push rod is pushed to its limit position, the outer wall of the slider closes the discharge port. At the same time, the fitting groove and the inner wall of the hopper transition arc-shaped. A discharge guide plate is provided at the lower part of the outer wall of the discharge pipe corresponding to the discharge port.

[0011] Preferably, the rotary material handling device includes a material handling pipe and a rotary motor. One end of the material handling pipe is inserted into the hopper, and the other end is inserted into the chassis. The material handling pipe is rotatably connected to both the hopper and the chassis, and the rotation is supported by bearings. A shaft seal is installed at the gap position to prevent air leakage. The end of the material handling pipe inserted into the hopper is sealed. Multiple negative pressure material handling units are arranged in a ring on the outer wall of the material handling pipe, and the negative pressure material handling units correspond to the large diameter portion. An intermittent feeding unit is also installed on the outer wall of the material handling pipe. The intermittent feeding unit is located at the small diameter portion and cooperates with the feeding hopper. A transmission unit, which is a belt drive unit, is connected between the rotary motor and the material handling pipe.

[0012] Preferably, the negative pressure material handling unit includes a fan blade, inside which a screen is provided. The end of the fan blade is connected to the material handling pipe, and the screen faces the rotation direction of the fan blade. As the fan blade rotates, the plastic powder particles located in the large diameter portion are scooped into the screen. Fine particles are actively adsorbed and pass through the screen under the action of negative pressure, while coarse particles are intercepted. A rubber scraper is provided on the outer end face of the fan blade. The thickness of the rubber scraper gradually decreases in the direction away from the fan blade, and the end of the rubber scraper acts on the inner wall of the large diameter portion.

[0013] Preferably, the intermittent feeding unit includes an annular plate, which is clearance-fitted with the inner wall of the small-diameter portion, with a clearance of less than 0.2 mm; a plurality of material dropping holes are arranged in a ring on the surface of the annular plate; under normal conditions, the annular plate closes the bottom of the connecting pipe; when the material dropping hole corresponds to the connecting pipe, the plastic powder particles located in the connecting pipe fall into the hopper; a connecting plate is welded between the annular plate and the material receiving pipe.

[0014] Preferably, the upper end of the casing is provided with a mounting groove, in which an equipment box is movably detachable. The negative pressure fan is installed inside the casing. The negative pressure fan is connected to an inlet pipe and an outlet pipe. The inlet pipe passes through the front end of the equipment box and faces the material receiving pipe. The outlet pipe passes through the equipment box upward. A filter cup is provided on the inner wall of the inlet pipe. A portion of the material receiving pipe is inserted into the filter cup. When the negative pressure fan is working, a negative pressure suction is generated in the material receiving pipe after passing through the filter cup. The plastic powder particles are adsorbed and pass through the material receiving pipe, enter the casing, and are then stored downward into the storage device.

[0015] Preferably, the filter cup is conical, with its diameter gradually increasing towards the feed tube. Multiple support bodies are arranged in a ring at the end of the outer wall of the feed tube. An inclined surface is provided on the outer side of the support body, and the inclined surface is parallel to the inner conical surface of the filter cup. Brush bristles are placed on the inclined surface, and the brush bristles act on the inner wall surface of the filter cup.

[0016] Preferably, the storage device includes a lower box and an upper box, with one or more upper boxes overlapping the top of the lower box. A vibration motor is provided at the outer end face of the upper box, and a sieve plate is provided at the bottom of the upper box. The upper box slides into the slot and fits against the inner wall of the casing, so that the negative pressure of the negative pressure fan can effectively act on the material picking pipe. Right-angle grooves are provided on both sides of the bottom of the lower box, and rollers are installed in the right-angle grooves. A protruding part is provided at the bottom of the upper box, which fits against the inner wall of the lower box.

[0017] Preferably, a light-transmitting plate is provided at the end face of the end cap.

[0018] The beneficial effects of this invention are: This device uses a rotary material handling unit to agitate the plastic powder particles falling into the hopper. During the rotation, the active movement of the screen scoops up the plastic powder particles, which are then collected on the surface of the screen. As the rotary material handling unit continues to rotate, the plastic powder particles that have been screened by the screen enter the material receiving pipe and are discharged after being adsorbed by negative pressure. At the same time, the negative pressure suction generated by the negative pressure fan also actively captures plastic powder particles of the correct size through the screen, improving the screening efficiency.

[0019] After screening, the plastic powder particles are drawn in by the negative pressure of the negative pressure fan and fall into the storage device. The storage device can vibrate independently and undergo secondary screening through its matching sieve plate to further refine the plastic powder particles.

[0020] This device has a simple structure and low cost, making it suitable for widespread use. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the storage device sliding out. Figure 3 This is a partial schematic diagram of the device; Figure 4 This is a cross-sectional view of the discharge device; Figure 5 This is a schematic diagram of the rotary material handling device; Figure 6 This is a 3D view of the negative pressure material handling unit; Figure 7 This is a cross-sectional view of the negative pressure material handling unit; Figure 8 for Figure 7 Enlarged view at point A; Figure 9 This is a schematic diagram showing the fit between the chassis and the material handling tube; Figure 10 This is a schematic diagram showing the connection between the feed tube and the filter cup; Figure 11 A perspective view of the storage device; Figure 12 This is a partial sectional view of the upper box body. Detailed Implementation

[0023] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0024] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0025] In the description of this invention, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0026] Furthermore, in the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "set," "socket," "connect," "through," and "plug-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] See Figure 1 , Figure 2 and Figure 3 The illustrated plastic powder separation device includes a separation chamber 1 and a feed hopper 2 installed on the upper end of the separation chamber 1. A discharge device 3 is provided at the lower end of the separation chamber 1. A rotary material handling device 4 is rotatably installed on the separation chamber 1. A housing 5 is provided at the end of the rotary material handling device 4 away from the separation chamber 1. A negative pressure fan is installed through the housing 5. When the negative pressure fan is working, a negative pressure is generated in the rotary material handling device 4, and the plastic powder particles located in the separation chamber 1 are adsorbed by the negative pressure. A slot is provided on the back of the housing 5, and a storage device 7 for storing plastic powder slides in through the slot.

[0029] In the above technical solution, the plastic powder particles to be screened enter through the feed hopper 2. The plastic powder particles enter the separation chamber 1 for preliminary separation. The coarse particles are intercepted and discharged through the discharge device 3, while the fine particles are air-separated and screened through the rotary feeding device 4, and then conveyed to the machine box 5. They are then screened a second time through the storage device 7 to complete the multi-stage screening of the plastic powder.

[0030] The advantages of the above screening method are: The rotary feeding device 4 is used to stir the plastic powder particles, so as to effectively select the plastic powder particles that meet the particle size standard. This stirring action will also disperse the clumps of plastic powder particles, which will help the qualified particles to be screened out.

[0031] See Figure 2 and Figure 3 As shown, the separation chamber 1 includes a cylindrical chamber body 101, with an end cap 102 at one end. The chamber body 101 includes a small-diameter portion 111 and a large-diameter portion 112. A connecting pipe 103 is provided at the top of the small-diameter portion 111, which connects to the feed hopper 2. A shaft tube 104 is provided at the axial center of the end of the chamber body 101 away from the end cap 102. The rotary material handling device 4 is inserted into the chamber body 101 via the shaft tube 104. The discharge device 3 is installed at the bottom of the large-diameter portion 112.

[0032] See Figure 3 and Figure 4 As shown, the discharge device 3 includes a discharge pipe 301, which is welded to the bottom of the large-diameter portion 112 and communicates with the inner cavity of the hopper 101. An electric push rod 302 is installed at the bottom of the discharge pipe 301. A sliding rod 303 is connected to the telescopic end of the electric push rod 302. The sliding rod 303 slides along the axis of the discharge pipe 301. A discharge port 304 is provided at the upper part of the outer wall of the discharge pipe 301. A slider 305 is provided at the upper end of the discharge rod 301. The slider 305 fits into the inner wall of the discharge rod 301. An arc-shaped fitting groove 306 is machined on the top of the slider 305. When the electric push rod 302 is pushed to the limit position, the outer wall of the slider 305 closes the discharge port 304. At the same time, the fitting groove 306 and the inner wall of the hopper 301 are arc-shaped transitions. At the outer wall of the discharge pipe 301, a discharge guide plate 307 is provided at the lower part corresponding to the discharge port 304.

[0033] In the above technical solution, during the rotation of the rotary material handling device 4, the electric push rod 302 needs to be kept moving upward. After the rotation of the rotary material handling device 4 is completed, the intercepted coarse plastic powder particles need to be discharged. At this time, the electric push rod 302 retracts, causing the slider 305 to descend until the fitting groove 306 is exposed at the discharge port 304. The plastic powder particles are then discharged along the discharge port 304, completing the discharge of coarse particles.

[0034] See Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the rotary material handling device 4 includes a material handling pipe 401 and a rotary motor 402. One end of the material handling pipe 401 is inserted into the hopper 101, and the other end is inserted into the chassis 5. The material handling pipe 401 is rotatably connected to the hopper 101 and the chassis 5, respectively. Rotation is supported by bearings, and a shaft seal is installed at the gap position to prevent air leakage. The end of the material handling pipe 401 inserted into the hopper 101 is closed. Multiple negative pressure material handling units 403 are arranged in a ring on the outer wall of the material handling pipe 401. The negative pressure material handling units 403 correspond to the large diameter portion 112. An intermittent feeding unit 404 is also installed on the outer wall of the material handling pipe 401. The intermittent feeding unit 404 is located at the small diameter portion 111 and cooperates with the feed hopper 2. A transmission unit 405 is connected between the rotary motor 402 and the material handling pipe 401. The transmission unit 405 is a belt drive unit.

[0035] In the above technical solution, the material feeding pipe 401 rotates, which drives the intermittent feeding unit 404 to rotate. The intermittent feeding unit 404 realizes intermittent feeding, avoiding material blockage caused by feeding too much material at once.

[0036] The material receiving pipe 401 rotates, driving the negative pressure material receiving unit 403 to stir and feed the plastic powder particles into the bin 101, completing the screening and air separation of the plastic powder particles, and realizing the extraction of fine plastic powder particles.

[0037] See Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the negative pressure material handling unit 403 includes a fan blade 441, and a screen 442 is provided inside the fan blade 441. The end of the fan blade 441 is connected to the material handling pipe 401. The screen 442 faces the rotation direction of the fan blade 441. As the fan blade 441 rotates, the plastic powder particles located at the large diameter portion 112 are scooped onto the screen 442. Fine particles are actively adsorbed and pass through the screen 442 under the action of negative pressure, while coarse particles are intercepted. A rubber scraper 443 is provided at the outer end face of the fan blade 441. The thickness of the rubber scraper 443 gradually decreases in the direction away from the fan blade 441. The end of the rubber scraper 443 acts on the inner wall of the large diameter portion 112.

[0038] In the above technical solution, the rotation of the material picking pipe 401 causes the fan blade 441 to rotate and scoop up plastic powder particles. After passing through the screen 442, the plastic powder particles fall into the inner side of the material picking pipe 401 and are sucked into the storage device 7 by negative pressure, thus completing the separation of fine plastic powder particles.

[0039] As the screen 442 continues to rotate, when the screen 442 rotates to face downwards, the coarse powder particles that cannot be screened off its surface fall off.

[0040] Because a 442 screen is used for primary screening, the negative pressure fan is kept running at full power. This can improve the absorption efficiency while avoiding the separation of coarse plastic powder particles by air separation. Therefore, this combination of air separation and screening can greatly improve the screening efficiency.

[0041] See Figure 5 As shown, the intermittent feeding unit 404 includes an annular plate 444, which is clearance-fitted with the inner wall of the small-diameter portion 111, with a gap of less than 0.2 mm. A plurality of discharge holes 445 are arranged in a ring on the surface of the annular plate 444. Under normal conditions, the annular plate 444 closes the bottom of the connecting pipe 103. When the discharge hole 445 corresponds to the connecting pipe 103, the plastic powder particles located in the connecting pipe 103 fall into the hopper 101. A connecting plate 446 is welded between the annular plate 444 and the feeding pipe 401.

[0042] In the above technical solution, the connecting pipe 103 is blocked by the annular plate 444, and the material will only be discharged when the discharge hole 445 corresponds to the connecting pipe 103, thus avoiding the material blockage problem caused by continuous material discharge.

[0043] Compared to traditional technologies that use a separate feeding device to control the amount of material fed, the operating method in this case is more energy-efficient and lower in cost.

[0044] See Figure 2 , Figure 9 and Figure 10 As shown, the upper end of the casing 5 is provided with a mounting groove, in which an equipment box 51 is movably detachable. The negative pressure fan is installed inside the casing 5. The negative pressure fan is connected to an air inlet pipe 61 and an air outlet pipe 62. The air inlet pipe 61 passes through the front end of the equipment box 51 and faces the material receiving pipe 401. The air outlet pipe 62 passes upward through the equipment box 51. A filter cup 63 is provided on the inner wall of the air inlet pipe 61. A portion of the material receiving pipe 401 is inserted into the filter cup 63. When the negative pressure fan is working, a negative pressure suction is generated in the material receiving pipe 401 after passing through the filter cup 63. The plastic powder particles are adsorbed and pass through the material receiving pipe 401 and enter the casing 5. Then they are stored downward into the storage device 7.

[0045] In the above technical solution, the design of the filter cup 63 prevents ultrafine powder particles from being sucked into the negative pressure fan.

[0046] See Figure 9 and Figure 10As shown, the filter cup 63 is conical, and its diameter gradually increases towards the feed tube 401. At the end of the outer wall of the feed tube 401, a plurality of support bodies 4441 are arranged in a ring. An inclined surface 4442 is provided on the outer side of the support body 4441. The inclined surface 4442 is parallel to the inner conical surface of the filter cup 63. Brush bristles 4443 are placed on the inclined surface 4442, and the brush bristles 4443 act on the inner wall surface of the filter cup 63.

[0047] In the above technical solution, the rotation of the feed tube 401 can also drive the bristles 4443 to clean the inner wall of the filter cup 63, maintaining effective ventilation efficiency.

[0048] See Figure 11 and Figure 12 As shown, the storage device 7 includes a lower box 701 and an upper box 702. One or more upper boxes 702 are provided, overlapping the top of the lower box 701. A vibration motor 703 is provided at the outer end face of the upper box 702. A sieve plate 704 is provided at the bottom of the upper box 702. After sliding into the slot, the upper box 702 fits against the inner wall of the casing 5, allowing the negative pressure from the negative pressure fan to effectively act on the material receiving pipe 401. Right-angle grooves are provided on both sides of the bottom of the lower box 701, and rollers 705 are installed in the right-angle grooves. A protruding portion 771 is provided at the bottom of the upper box 702, fitting against the inner wall of the lower box 701.

[0049] In the above technical solution, secondary screening can be achieved by overlapping the lower box 701 and the upper box 702. The secondary screening is carried out by vibrating screening.

[0050] See Figure 3 As shown, a light-transmitting plate 122 is provided at the end face of the end cap 102.

[0051] The light-transmitting plate 122 allows observation of whether there is material blockage inside the hopper 101.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A plastic powder separation device with multi-stage filtration function, characterized in that: The device includes a separation chamber (1) and a feed hopper (2) installed at the upper end of the separation chamber (1). A discharge device (3) is provided at the lower end of the separation chamber (1). A rotary material handling device (4) is rotatably installed on the separation chamber (1). A housing (5) is provided at the end of the rotary material handling device (4) away from the separation chamber (1). A negative pressure fan is installed through the housing (5). When the negative pressure fan is working, a negative pressure is generated in the rotary material handling device (4). The negative pressure adsorbs the plastic powder particles located in the separation chamber (1). A slot is provided on the back of the housing (5). A storage device (7) for storing plastic powder is inserted into the separation chamber (1); the separation chamber (1) includes a cylindrical chamber body (101), one end of which is provided with an end cap (102). The chamber body (101) includes a small diameter portion (111) and a large diameter portion (112). A connecting pipe (103) is provided at the top of the small diameter portion (111), and the feed hopper (2) is connected through the connecting pipe (103). A shaft tube (104) is provided at the axial center of the end of the chamber body (101) away from the end cap (102). The rotary material handling device (4) is connected to the feed hopper (2) via the shaft tube (104). 04) Inserted into the hopper (101), the discharge device (3) is installed at the bottom of the large diameter part (112); the rotary material handling device (4) includes a material handling pipe (401) and a rotary motor (402), and a plurality of negative pressure material handling units (403) are arranged in a ring on the outer wall of the material handling pipe (401); the negative pressure material handling unit (403) includes a fan blade (441), and a screen (442) is arranged inside the fan blade (441). The end of the fan blade (441) is connected to the material handling pipe (401), and the screen (442) faces towards As the fan blade (441) rotates, the plastic powder particles located in the large diameter portion (112) are scooped onto the screen (442). Fine particles are actively adsorbed and pass through the screen (442) under the action of negative pressure, while coarse particles are intercepted. A rubber scraper (443) is provided on the outer end face of the fan blade (441). The thickness of the rubber scraper (443) gradually decreases in the direction away from the fan blade (441), and the end of the rubber scraper (443) acts on the inner wall of the large diameter portion (112).

2. The plastic powder separation equipment with multi-stage filtration function according to claim 1, characterized in that: The discharge device (3) includes a discharge pipe (301), which is welded to the bottom of the large-diameter portion (112) and communicates with the inner cavity of the silo (101). An electric push rod (302) is installed at the bottom of the discharge pipe (301), and a sliding rod (303) is connected to the telescopic end of the electric push rod (302). The sliding rod (303) slides along the axis of the discharge pipe (301). A discharge port (304) is provided at the upper part of the outer wall of the discharge pipe (301). The sliding rod (303) has a discharge port (304) at the upper part of the outer wall of the discharge pipe (301). A slider (305) is provided at the upper end, which fits into the inner wall of the discharge pipe (301). An arc-shaped fitting groove (306) is machined on the top of the slider (305). When the electric push rod (302) is pushed to the limit position, the outer wall of the slider (305) closes the discharge port (304). At the same time, the fitting groove (306) and the inner wall of the hopper (101) are arc-shaped transitions. At the outer wall of the discharge pipe (301), a discharge guide plate (307) is provided at the lower part of the discharge port (304).

3. The plastic powder separation equipment with multi-stage filtration function according to claim 2, characterized in that: One end of the material taking pipe (401) is inserted into the silo body (101), and the other end is inserted into the machine box (5). The material taking pipe (401) is rotatably connected to the silo body (101) and the machine box (5) respectively. The rotation is supported by bearings. A shaft seal is installed at the gap position to prevent air leakage. The end of the material taking pipe (401) inserted into the silo body (101) is closed. The negative pressure material taking unit (403) corresponds to the large diameter part (112). An intermittent feeding unit (404) is also installed on the outer wall of the material taking pipe (401). The intermittent feeding unit (404) is located at the small diameter part (111) and cooperates with the feeding hopper (2). A transmission unit (405) is cooperated between the rotary motor (402) and the material taking pipe (401). The transmission unit (405) is a belt drive unit.

4. The plastic powder separation equipment with multi-stage filtration function according to claim 3, characterized in that: The intermittent feeding unit (404) includes an annular plate (444), which is in clearance fit with the inner wall of the small diameter portion (111) with a gap of less than 0.2 mm. Multiple dropping holes (445) are arranged in a ring on the surface of the annular plate (444). Under normal conditions, the annular plate (444) closes the bottom of the connecting pipe (103). When the dropping hole (445) corresponds to the connecting pipe (103), the plastic powder particles in the connecting pipe (103) fall into the hopper (101). A connecting plate (446) is welded between the annular plate (444) and the feeding pipe (401).

5. The plastic powder separation equipment with multi-stage filtration function according to claim 3, characterized in that: The upper end of the casing (5) is provided with an installation groove, and an equipment box (51) is movably detachable in the installation groove. The negative pressure fan is installed in the casing (5). The negative pressure fan is connected to an air inlet pipe (61) and an air outlet pipe (62). The air inlet pipe (61) passes through the front end of the equipment box (51) and faces the material taking pipe (401). The air outlet pipe (62) passes through the equipment box (51) upward. A filter cup (63) is provided on the inner wall of the air inlet pipe (61). A portion of the material taking pipe (401) is inserted into the filter cup (63). When the negative pressure fan is working, it generates negative pressure suction in the material taking pipe (401) after passing through the filter cup (63). The plastic powder particles are adsorbed and pass through the material taking pipe (401) and enter the casing (5). Then they are stored downward into the storage device (7).

6. The plastic powder separation equipment with multi-stage filtration function according to claim 5, characterized in that: The filter cup (63) is conical, and its diameter gradually increases towards the feed tube (401). Multiple support bodies (4441) are arranged in a ring at the end of the outer wall of the feed tube (401). An inclined surface (4442) is provided on the outer side of the support body (4441). The inclined surface (4442) is parallel to the inner conical surface of the filter cup (63). Brush bristles (4443) are placed on the inclined surface (4442), and the brush bristles (4443) act on the inner wall surface of the filter cup (63).

7. The plastic powder separation equipment with multi-stage filtration function according to claim 5, characterized in that: The storage device (7) includes a lower box (701) and an upper box (702). There is one or more upper boxes (702). The upper boxes (702) overlap the top of the lower box (701). A vibration motor (703) is provided at the outer end face of the upper box (702). A sieve plate (704) is provided at the bottom of the upper box (702). After the upper box (702) slides into the slot, it fits the inner wall of the casing (5), so that the negative pressure of the negative pressure fan can effectively act on the material picking pipe (401). Right angle grooves are provided on both sides of the bottom of the lower box (701), and rollers (705) are installed in the right angle grooves. A protruding part (771) is provided at the bottom of the upper box (702), and the protruding part (771) fits the inner wall of the lower box (701).

8. The plastic powder separation equipment with multi-stage filtration function according to claim 1, characterized in that: A light-transmitting plate (122) is provided at the end face of the end cap (102).

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