A waste plastic cleaning surface impurity treatment device

Abstract

This invention relates to the field of waste plastic cleaning technology and proposes a device for treating surface impurities in waste plastic cleaning. The device includes a frame, a processing tank fixedly connected to the top of the frame, hollow tubes rotatably connected to both ends of the processing tank and penetrating its side walls, and a centrifuge cylinder fixedly connected between the two hollow tubes. Pipe joints are fixedly connected to both ends of the frame; a feed pipe is fixedly connected to the top of one pipe joint, and a discharge pipe is fixedly connected to the bottom of the other pipe joint. A drive mechanism is located inside the frame. A discharge pipe is fixedly connected to the bottom of the processing tank, and a sedimentation tank is fixedly connected to the outlet end of the discharge pipe. A discharge pipe is fixedly connected to the top of the sedimentation tank, and a suction mechanism is located at the outlet end of the discharge pipe. This invention achieves deep impurity removal through centrifugal peeling combined with dynamic tapping, and combines a closed discharge system and intermittent suction from the sedimentation tank for dual anti-pollution design, significantly improving the surface cleaning effect of waste plastics.

Description

Technical Field

[0001] This invention relates to the field of waste plastic cleaning technology, specifically to a device for treating surface impurities in waste plastic cleaning. Background Technology

[0002] In the field of waste plastic recycling, cleaning surface impurities is a key pretreatment step. Generally, waste plastics are first crushed and then cleaned and sorted. In waste plastic crushing, sorting and cleaning equipment, after the material passes through the flotation tank to remove impurities such as metal or mud, it is directly sent to the rinsing tank for further cleaning to remove light impurities from the surface of the material. A search revealed a Chinese patent (publication number: CN103112102B) disclosing a "multi-functional friction separation device for cleaning waste plastics," comprising a cylinder, a rotating shaft, and beating blades. The cylinder has an inlet and an outlet at both ends. The cylinder is a hollow cylindrical structure closed at both ends. The space inside the cylinder near the inlet is a friction section, and the space inside the cylinder near the outlet is a separation and dehydration section. Multiple through holes are distributed on the side wall of the separation and dehydration section. The sidewalls of the cylinder are closed. In the friction section, as the beater blades rotate at high speed, the material (including waste plastics and fluid media, such as water or brine) is beaten and thrown at high speed against the inner wall of the cylinder, causing impacts. Impurities such as labels, oil stains, and fluid media from the flotation cell attached to the surface of the waste plastics are separated. In the separation and dewatering section, as the beater blades rotate, the separated impurities are centrifugally ejected from the cylinder through the through holes along with the fluid media, and the waste plastics are sent to the discharge port.

[0003] However, in the process of implementing the relevant technologies, this type of technical solution has certain technical defects: First, although this type of patent removes some firmly attached impurities (such as oil, label adhesive, and mud) by rotating the flapping blades, the impurities that fall off during the cleaning process are easily mixed with plastic fragments and re-attach to the plastic surface when draining water, causing secondary pollution.

[0004] Secondly, the mixture needs to be allowed to settle after cleaning, but plastic fragments can easily come into physical contact with the sediment layer, causing impurities to mix in again, resulting in poor cleaning effect.

[0005] In view of this, the present invention proposes a device for treating surface impurities in waste plastic cleaning. Summary of the Invention

[0006] This invention proposes a device for treating surface impurities in waste plastic cleaning, which solves the problem of secondary pollution during the drainage process in the prior art.

[0007] The technical solution of the present invention is as follows: A waste plastic cleaning surface impurity treatment device includes a frame, a treatment box fixedly connected to the top of the frame, hollow tubes rotatably connected to both ends of the treatment box and penetrating the side wall of the treatment box, a centrifuge tube fixedly connected between the two hollow tubes, pipe joints fixedly connected to both ends of the frame, the two pipe joints rotatably connected to the ends of the two hollow tubes respectively and communicating with the inside of the hollow tubes, a feed pipe fixedly connected to the top of one pipe joint, a discharge pipe fixedly connected to the bottom of the other pipe joint, a drive mechanism for driving the hollow tubes to rotate is provided on the inner side of the frame, a discharge pipe is fixedly connected to the bottom of the treatment box, a sedimentation tank is fixedly connected to the outlet end of the discharge pipe, a discharge pipe is fixedly connected to the top of the sedimentation tank, and a suction mechanism is provided at the outlet end of the discharge pipe to intermittently discharge the plastic floating in the sedimentation tank by cooperating with the activation of the drive mechanism.

[0008] Preferably, an installation rod is provided on the inner side of the centrifuge tube, and a plurality of beating blades equidistantly distributed along the length direction of the installation rod are fixedly connected to the outer side of the installation rod. A connecting rod is fixedly connected to one end of the installation rod, and one end of the connecting rod passes through the corresponding hollow tube and is fixedly connected to the inner wall of the hollow tube.

[0009] Preferably, the drive mechanism includes a motor fixedly mounted at one end of the frame, the output shaft of the motor being fixedly connected to a first gear, and a second gear being fixedly connected to the outer side of one of the hollow tubes, the second gear meshing with the first gear.

[0010] Preferably, the ratio of the number of teeth of the second gear to the number of teeth of the first gear is 1:10-12.

[0011] Preferably, the material extraction mechanism includes a material extraction cylinder fixedly connected to the outside of the sedimentation tank, a push-pull rod slidably connected to the top of the material extraction cylinder and penetrating the top wall of the material extraction cylinder, a piston fixedly connected to the bottom of the push-pull rod, the piston being slidably connected to the inner wall of the material extraction cylinder, the inlet end of the material extraction cylinder being connected to the outlet pipe, a plastic recycling pipe being fixedly connected to the outlet end of the material extraction cylinder, and a linkage component provided at the top of the push-pull rod to drive the push-pull rod to slide up and down reciprocally by cooperating with the start of a motor.

[0012] Preferably, the inlet end of the extraction cylinder is fixedly connected to a feed check valve that communicates with the discharge pipe, and the plastic recycling pipe is fixedly connected to a discharge check valve.

[0013] Preferably, the linkage component includes a cam, which is fixedly connected to the output shaft of the motor. A screw is provided on the outer edge of the cam, and a connecting plate is rotatably connected to one end of the screw. A connecting seat is hinged to the end of the connecting plate away from the screw, and one end of the connecting seat is fixedly connected to the push-pull rod.

[0014] Preferably, the cam has a groove along its center line that slides with the screw, and the threaded end of the screw is threaded with a locking nut.

[0015] Preferably, a sealing ring is provided at the connection between the two hollow tubes and the corresponding pipe joints.

[0016] The working principle and beneficial effects of this invention are as follows: 1. When the centrifuge drum rotates at high speed, the waste plastic fragments and the washing water generate intense friction. The centrifugal force causes large impurities (such as labels and glue blocks) to detach from the plastic surface and be discharged immediately through the discharge pipe connected by the hollow tube. The beater blades rotate at high speed synchronously with the centrifuge drum, dynamically impacting the plastic fragments to further peel off loose impurities (such as mud and oil). The impurities are dispersed by the water flow to prevent them from re-attaching. After being separated by the centrifuge drum, the impurities are directly discharged from the system through the hollow tube and the discharge pipe, preventing the impurities from coming into contact with the plastic fragments again during the drainage process, thus completely solving the problem of secondary pollution.

[0017] 2. The centrifuged plastic fragments and wastewater enter the sedimentation tank through the feed pipe. Impurities settle to the bottom, while plastic fragments float on the surface. The pumping mechanism operates synchronously with the motor of the drive mechanism through a linkage component. The cam drives the push-pull rod to move up and down, driving the piston to slide back and forth in the pumping cylinder. When the piston moves upward, the feed check valve opens, only pumping the plastic fragments from the upper layer of the sedimentation tank; when the piston moves downward, the discharge check valve opens, discharging the plastic to the recovery pipe. This intermittent pumping ensures that impurities settle sufficiently and avoids agitating the bottom impurities during pumping.

[0018] 3. The material extraction mechanism is directly driven by the motor through the linkage component, without the need for an additional power source, which reduces energy consumption and ensures synchronous operation; the screw in the linkage component can slide along the cam slide groove, and the position is fixed by the locking nut, and the stroke of the push-pull rod can be flexibly adjusted to adapt to different material extraction requirements. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of a waste plastic cleaning and surface impurity treatment device according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a waste plastic cleaning and surface impurity treatment device according to the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the internal structure of the centrifuge tube of the present invention; Figure 4 This is a schematic diagram of the drive mechanism of the present invention; Figure 5This is a schematic diagram of the material extraction cylinder of the present invention; Figure 6 This is a schematic diagram of the linkage component of the present invention; Figure 7 This is a schematic diagram of the cam structure of the present invention.

[0021] In the diagram: 1. Frame; 2. Processing box; 3. Pipe connector; 4. Hollow pipe; 5. Centrifuge cylinder; 51. Connecting rod; 52. Mounting rod; 53. Beating blade; 6. Feed pipe; 7. Drive mechanism; 71. Motor; 72. First gear; 73. Second gear; 8. Waste discharge pipe; 9. Discharge pipe; 10. Sedimentation tank; 11. Discharge pipe; 12. Material extraction mechanism; 121. Material extraction cylinder; 122. Push-pull rod; 123. Piston; 124. Feed check valve; 125. Plastic recycling pipe; 126. Discharge check valve; 127. Linkage assembly; 1271. Cam; 1272. Screw; 1273. Connecting plate; 1274. Connecting seat; 1275. Locking nut; 1276. Slide groove. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figures 1 to 7 As shown, this embodiment proposes a waste plastic surface impurity treatment device, including a frame 1, a treatment box 2 fixedly connected to the top of the frame 1, hollow tubes 4 penetrating the side walls of the treatment box 2 rotatably connected to both ends of the treatment box 2, a centrifuge cylinder 5 fixedly connected between the two hollow tubes 4, pipe joints 3 fixedly connected to both ends of the frame 1, the two pipe joints 3 being rotatably connected to the ends of the two hollow tubes 4 respectively and communicating with the interior of the hollow tubes 4, and sealing rings are provided at the connection points between the two hollow tubes 4 and the corresponding pipe joints 3; One of the pipe joints 3 is fixedly connected to the top of the feed pipe 6, and the other pipe joint 3 is fixedly connected to the bottom of the discharge pipe 8. The inner side of the frame 1 is provided with a drive mechanism 7 for driving the hollow tube 4 to rotate. The bottom of the processing box 2 is fixedly connected to the discharge pipe 9. The outlet end of the discharge pipe 9 is fixedly connected to the sedimentation tank 10. The top of the sedimentation tank 10 is fixedly connected to the discharge pipe 11. The outlet end of the discharge pipe 11 is provided with a suction mechanism 12 that, in conjunction with the start of the drive mechanism 7, intermittently discharges the floating plastic in the sedimentation tank 10.

[0024] The shredded plastic and cleaning water are fed into the pipe connector 3 through the feed pipe 6, and then further fed into the centrifuge drum 5 through the hollow pipe 4. The drive mechanism 7 drives the hollow pipe 4 to rotate, causing the centrifuge drum 5 to rotate at high speed. This causes the shredded plastic and cleaning water inside the centrifuge drum 5 to undergo centrifugal motion simultaneously, resulting in intense friction between the shredded plastic and the cleaning water. This causes large impurities on the surface of the shredded plastic to detach from the water, while the shredded plastic can flow with the water through the filter holes of the centrifuge drum 5 into the bottom wall of the treatment tank 2. The large impurities are blocked inside the centrifuge drum 5, thus achieving complete separation of large impurities from the shredded plastic. The shredded plastic and cleaning water are then fed into the sedimentation tank 10 through the discharge pipe 9 for sedimentation, while the large impurities inside the centrifuge drum 5 are discharged through the discharge pipe 8. This treatment method can greatly improve the cleaning effect on the surface of the shredded plastic and avoid the problem of large impurities re-adhering to the surface of the shredded plastic during the cleaning process, causing secondary pollution.

[0025] Furthermore, an installation rod 52 is provided on the inner side of the centrifuge tube 5, and several beating blades 53 are fixedly connected to the outer side of the installation rod 52, which are equidistantly distributed along the length direction of the installation rod 52. A connecting rod 51 is fixedly connected to one end of the installation rod 52, and one end of the connecting rod 51 passes through the corresponding hollow tube 4 and is fixedly connected to the inner wall of the hollow tube 4.

[0026] By activating the drive mechanism 7, the hollow tube 4 is driven to rotate, causing the centrifuge drum 5 to rotate at high speed. This causes the shredded plastic and the cleaning water inside the centrifuge drum 5 to undergo centrifugal motion simultaneously. As a result, the shredded plastic and the cleaning water will dynamically collide with the beating blades 53, which will cause the beating blades 53 to peel off the loose impurities (dirt, some labels, and some glue) on the surface of the shredded plastic. At the same time, the cleaning water will disperse the loose impurities so that they cannot re-adhere, further improving the cleaning effect.

[0027] Furthermore, the drive mechanism 7 includes a motor 71 fixedly mounted on one end of the frame 1. The output shaft of the motor 71 is fixedly connected to a first gear 72, and a second gear 73 is fixedly connected to the outside of one of the hollow tubes 4. The second gear 73 meshes with the first gear 72, and the gear ratio of the second gear 73 to the first gear 72 is 1:10.

[0028] By starting the motor 71, the first gear 72 is driven to rotate, which causes the second gear 73 to rotate synchronously. Since the gear ratio of the second gear 73 to the first gear 72 is 1:10, the second gear 73 rotates at a faster speed, thereby driving the hollow tube 4 to rotate at high speed. This causes the centrifuge drum 5 to rotate at high speed, and the crushed plastic and the washing water inside the centrifuge drum 5 to move in a centrifugal motion simultaneously. This causes intense friction between the crushed plastic and the washing water, thereby causing large impurities on the surface of the crushed plastic to detach from it.

[0029] Furthermore, the material extraction mechanism 12 includes an extraction cylinder 121 fixedly connected to the outside of the sedimentation tank 10. A push-pull rod 122, penetrating the top wall of the extraction cylinder 121, is slidably connected to the top of the extraction cylinder 121. A piston 123 is fixedly connected to the bottom end of the push-pull rod 122. The piston 123 is slidably connected to the inner wall of the extraction cylinder 121. The inlet end of the extraction cylinder 121 is connected to the outlet pipe 11. A plastic recycling pipe 125 is fixedly connected to the outlet end of the extraction cylinder 121. A feed check valve 124, connected to the outlet pipe 11, is fixedly connected to the inlet end of the extraction cylinder 121. The plastic recycling pipe 125... A discharge check valve 126 is fixedly connected. The top of the push-pull rod 122 is provided with a linkage component 127 that drives the push-pull rod 122 to slide up and down reciprocally when the motor 71 is started. The linkage component 127 includes a cam 1271, which is fixedly connected to the output shaft of the motor 71. A screw 1272 is provided on the outer edge of the cam 1271. A connecting plate 1273 is rotatably connected to one end of the screw 1272. A connecting seat 1274 is hinged to the end of the connecting plate 1273 away from the screw 1272. One end of the connecting seat 1274 is fixedly connected to the push-pull rod 122.

[0030] By starting the motor 71, the cam 1271 is driven to rotate, causing the connecting plate 1273 to drive the push-pull rod 122 to slide up and down. This causes the piston 123 to slide up and down inside the suction cylinder 121. When the piston 123 slides upward, the pressure inside the suction cylinder 121 decreases, causing the discharge pipe 11 to extract the plastic floating at the top of the sedimentation tank 10 and guide it into the suction cylinder 121. When the piston 123 slides downward, the pressure inside the suction cylinder 121 increases, causing the plastic recovery pipe 125 to discharge the plastic inside the suction cylinder 121 for collection and recycling. This cycle continues, and the plastic recovery pipe 125 can intermittently discharge the plastic floating at the top of the sedimentation tank 10. This intermittent suction method allows impurities in the washing water inside the sedimentation tank 10 to settle sufficiently, thereby improving the treatment effect of impurities on the plastic surface.

[0031] Furthermore, the cam 1271 has a groove 1276 along its center line that slides with the screw 1272, and the threaded end of the screw 1272 is threadedly connected to a locking nut 1275. By loosening the locking nut 1275, the screw 1272 can slide along the groove 1276, thus adjusting the distance between the rotation center of the screw 1272 and the cam 1271. This changes the stroke of the connecting seat 1274, which in turn adjusts the reciprocating stroke of the piston 123, thereby adjusting the amount of plastic extracted by the extraction cylinder 121 in a single cycle to meet the actual extraction flow rate requirements, offering high flexibility.

[0032] Working principle: First, shredded plastic and cleaning water are introduced into the pipe connector 3 through the feed pipe 6. Then, the shredded plastic and cleaning water are introduced into the centrifuge drum 5 through the hollow pipe 4. The motor 71 drives the first gear 72 to rotate, which causes the second gear 73 to rotate synchronously. Since the gear ratio of the second gear 73 to the first gear 72 is 1:10, the second gear 73 rotates at a faster speed, which drives the hollow pipe 4 to rotate at high speed. This causes the centrifuge drum 5 to rotate at high speed. As a result, the shredded plastic and cleaning water inside the centrifuge drum 5 undergo centrifugal motion simultaneously, which generates intense friction between the shredded plastic and the cleaning water, causing large impurities on the surface of the shredded plastic to detach from it. At the same time, the shredded plastic and cleaning water dynamically impact the beating blades 53, which peel off loose impurities (dirt, some labels, and some glue) from the surface of the shredded plastic. The cleaning water further disperses the loose impurities, preventing them from re-adhering, thus further improving the cleaning effect. When the motor 71 starts, it synchronously drives the cam 1271 to rotate, causing the connecting plate 1273 to drive the push-pull rod 122 to slide up and down. This causes the piston 123 to slide up and down inside the suction cylinder 121. When the piston 123 slides upward, the pressure inside the suction cylinder 121 decreases, causing the discharge pipe 11 to extract the plastic floating at the top of the sedimentation tank 10 and guide it into the suction cylinder 121. When the piston 123 slides downward, the pressure inside the suction cylinder 121 increases, causing the plastic recovery pipe 125 to discharge the plastic inside the suction cylinder 121 for collection and recycling. This cycle continues, and the plastic recovery pipe 125 can intermittently discharge the plastic floating at the top of the sedimentation tank 10. This intermittent suction method allows impurities in the washing water inside the sedimentation tank 10 to settle sufficiently, thereby improving the treatment effect of impurities on the plastic surface.

[0033] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A waste plastic cleaning surface impurity treatment device, comprising a frame (1), wherein a treatment box (2) is fixedly connected to the top of the frame (1), characterized in that, Both ends of the processing box (2) are rotatably connected to hollow tubes (4) that penetrate the side wall of the processing box (2). A centrifuge cylinder (5) is fixedly connected between the two hollow tubes (4). Both ends of the frame (1) are fixedly connected to pipe joints (3). The two pipe joints (3) are rotatably connected to the ends of the two hollow tubes (4) and communicate with the inside of the hollow tubes (4). A feed pipe (6) is fixedly connected to the top of one of the pipe joints (3), and a discharge pipe is fixedly connected to the bottom of the other pipe joint (3). The inner side of the frame (1) is provided with a drive mechanism (7) for driving the hollow tube (4) to rotate. The bottom of the processing box (2) is fixedly connected to a feeding pipe (9). The outlet end of the feeding pipe (9) is fixedly connected to a sedimentation tank (10). The top end of the sedimentation tank (10) is fixedly connected to a discharge pipe (11). The outlet end of the discharge pipe (11) is provided with a material extraction mechanism (12) that, in conjunction with the start of the drive mechanism (7), intermittently discharges the plastic floating in the sedimentation tank (10).

2. The waste plastic cleaning surface impurity treatment device according to claim 1, characterized in that, An installation rod (52) is provided on the inner side of the centrifuge tube (5). Several beating blades (53) are fixedly connected to the outer side of the installation rod (52) and are distributed at equal intervals along the length direction of the installation rod (52). A connecting rod (51) is fixedly connected to one end of the installation rod (52). One end of the connecting rod (51) passes through the corresponding hollow tube (4) and is fixedly connected to the inner wall of the hollow tube (4).

3. The waste plastic cleaning surface impurity treatment device according to claim 1, characterized in that, The drive mechanism (7) includes a motor (71) fixedly installed at one end of the frame (1), the output shaft of the motor (71) is fixedly connected to a first gear (72), and a second gear (73) is fixedly connected to the outside of one of the hollow tubes (4), the second gear (73) meshing with the first gear (72).

4. The waste plastic cleaning surface impurity treatment device according to claim 3, characterized in that, The ratio of the number of teeth of the second gear (73) to the number of teeth of the first gear (72) is 1:(10-12).

5. The waste plastic cleaning surface impurity treatment device according to claim 3, characterized in that, The material extraction mechanism (12) includes a material extraction cylinder (121) fixedly connected to the outside of the sedimentation tank (10). A push-pull rod (122) that penetrates the top wall of the material extraction cylinder (121) is slidably connected to the top of the material extraction cylinder (121). A piston (123) is fixedly connected to the bottom of the push-pull rod (122). The piston (123) is slidably connected to the inner wall of the material extraction cylinder (121). The inlet end of the material extraction cylinder (121) is connected to the outlet pipe (11). A plastic recycling pipe (125) is fixedly connected to the outlet end of the material extraction cylinder (121). A linkage component (127) is provided at the top of the push-pull rod (122) to drive the push-pull rod (122) to slide up and down repeatedly by cooperating with the start of the motor (71).

6. The waste plastic cleaning surface impurity treatment device according to claim 5, characterized in that, The inlet end of the material extraction cylinder (121) is fixedly connected to a feed check valve (124) that is connected to the discharge pipe (11), and the plastic recycling pipe (125) is fixedly connected to a discharge check valve (126).

7. The waste plastic cleaning surface impurity treatment device according to claim 6, characterized in that, The linkage component (127) includes a cam (1271), which is fixedly connected to the output shaft of the motor (71). A screw (1272) is provided on the outer edge of the cam (1271). A connecting plate (1273) is rotatably connected to one end of the screw (1272). A connecting seat (1274) is hinged to the end of the connecting plate (1273) away from the screw (1272). One end of the connecting seat (1274) is fixedly connected to the push-pull rod (122).

8. The waste plastic cleaning surface impurity treatment device according to claim 7, characterized in that, The cam (1271) has a groove (1276) along its center line that slides with the screw (1272), and the threaded end of the screw (1272) is threaded with a locking nut (1275).

9. The waste plastic cleaning surface impurity treatment device according to claim 1, characterized in that, A sealing ring is provided at the connection between the two hollow tubes (4) and the corresponding pipe joints (3).

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