Polyethylene plastic scrap recycling extruder

Abstract

The present application relates to the field of plastic processing equipment, and in particular to a polyethylene plastic edge material recovery extruder. The polyethylene plastic edge material recovery extruder comprises an extrusion pipe, a feed hopper, a cooling mechanism, a scraping mechanism and a driving mechanism. The feed hopper comprises a first feed pipe and a second feed pipe which are coaxially arranged. The first feed pipe is a straight tube, and the second feed pipe is a tapered tube. The first feed pipe adopts a cooling mechanism for water cooling to prevent the plastic from melting and sticking in the first feed pipe. The second feed pipe adopts a scraping mechanism to prevent the plastic from sticking in the second feed pipe. Therefore, the present application adopts a combination of scraping and water cooling. According to the different cooling requirements of the first feed pipe and the second feed pipe and the characteristics of their respective structures, the respective adapted anti-adhesion structures are adopted, which effectively reduces the possibility of plastic adhesion during the extruder feeding process, and at the same time reduces the manufacturing cost of the extruder.

Description

Technical Field

[0001] The present application relates to the field of plastic processing equipment, and in particular to a polyethylene plastic edge material recovery extruder. Background Art

[0002] Polyethylene is mainly used to manufacture films, packaging materials, containers, pipes, daily necessities, etc. Waste and scrap materials are often generated in production, processing and daily life and need to be recycled. Otherwise, a large amount of plastic waste will cause serious pollution to the environment.

[0003] An extruder is an extrusion device used to process recycled plastic into particles. An extruder usually includes an extrusion system, a feed hopper, a heating device, and a cooling device. The extrusion system often uses a variable diameter screw to pressurize and convey the plastic. The feed hopper provides the extrusion system with recycled and crushed plastic raw materials, and the heating device provides high temperature for the plastic to melt during the process of the extrusion system. The feed hopper is affected by the heating device, which can easily cause the plastic to melt on the feed hopper and then adhere to the feed hopper, eventually blocking the feed hopper and hindering normal feeding. One of the functions of the cooling device is to cool the feed hopper and increase the solid conveying rate of the feed hopper.

[0004] However, in order to prevent plastic adhesion in the feed hopper as much as possible, higher requirements are placed on the cooling device, thereby increasing the manufacturing cost of the extruder. Summary of the invention

[0005] In order to reduce the possibility of plastic adhesion during the feeding process of the extruder and reduce the manufacturing cost of the extruder, the present application provides a polyethylene plastic edge material recovery extruder.

[0006] The present application provides a polyethylene plastic edge material recycling extruder, comprising:

[0007] An extrusion pipe, in which a screw is rotatably arranged;

[0008] A feed hopper, the feed hopper is located at one end of the extrusion pipeline, the feed hopper is connected to the extrusion pipeline; the feed hopper includes a first feed pipe and a second feed pipe, the first feed pipe is connected between the second feed pipe and the extrusion pipeline;

[0009] A cooling mechanism, comprising a cooling cylinder and an extrusion block, wherein the cooling cylinder is sleeved on the outside of the first feed pipe, the cooling cylinder has a receiving cavity surrounding the first feed pipe, the receiving cavity is used to fill the cooling liquid, the cooling cylinder is elastic, and the extrusion block is used to extrude the cooling cylinder;

[0010] a scraping mechanism, comprising a scraping rod, wherein the scraping rod is slidably fitted to the inner wall of the second feeding pipe; and

[0011] The driving mechanism is used to drive the extrusion block and the scraper rod to rotate around the axis of the feed hopper at the same time.

[0012] Optionally, the driving mechanism includes a driving part, a first pulley, a second pulley and a synchronous belt, the synchronous belt is sleeved on the first pulley and the second pulley, the driving part is transmission-connected to the first pulley, and the scraper rod and the extrusion block are both connected to the second pulley.

[0013] Optionally, the driving unit is connected to the screw driving rod.

[0014] Optionally, the inner diameter of the second feeding pipe gradually increases in a direction away from the extrusion pipe.

[0015] Optionally, the extrusion block includes a rotating block and a cam, the driving mechanism is transmission-connected to the rotating block, the cam is detachably connected to the rotating block, the cam is used to extrude the cooling cylinder, and the degree of extrusion of the cooling cylinder by the cam is adjustable.

[0016] Optionally, the rotating block is slidably fitted to the outer wall of the second feeding pipe.

[0017] Optionally, a first magnetic block is connected to the rotating block, and a second magnetic block is connected to the scraper rod, and there is magnetic attraction between the first magnetic block and the second magnetic block.

[0018] Optionally, the first magnetic block and the second magnetic block are both close to the bottom end of the second feeding pipe.

[0019] Optionally, the cooling cylinder includes a heat conductive sheet and a heat insulating cover, the heat conductive sheet is annular and fits onto the outer side of the first feed pipe, the heat insulating cover is connected to the side of the heat conductive sheet facing away from the first feed pipe, and the accommodating cavity is formed between the heat insulating cover and the heat conductive sheet.

[0020] Optionally, the heat conducting sheet is a metal sheet, and the heat insulating cover is a rubber cover.

[0021] In summary, this application has the following beneficial technical effects:

[0022] 1. The polyethylene plastic edge material recovery extruder of the present application is provided with an extrusion pipeline, a scraping mechanism, a cooling mechanism and a driving mechanism. While the driving mechanism drives the scraper rod to rotate, the driving mechanism can also drive the extrusion block to rotate, thereby disturbing the coolant in the cooling cylinder, so that the coolant flows regularly around the first feed pipe, thereby achieving sufficient heat absorption and cooling of the first feed pipe by the coolant during the flow process. The operation mode of using a pump as a driving source to drive the circulation of the coolant is saved, thereby achieving the effect of energy saving and material reduction. The present application adopts a method of scraping the inner wall of the second feed pipe with a scraper rod and a method of water cooling the first feed pipe with a cooling mechanism, which can make full use of the difference in the cooling requirements of the first feed pipe and the second feed pipe and their respective structural characteristics, simplify the structural design of the cooling mechanism, effectively reduce the possibility of plastic adhesion during the extruder feeding process, and reduce the manufacturing cost of the extruder.

[0023] 2. There is magnetic attraction between the extrusion block and the scraper rod, so that the scraper rod can be closely attached to the inner wall of the second feed tube during rotation without being easily deformed, and the extrusion block can be closely attached to the outer wall of the second feed tube during rotation. When the extrusion block is extruding the cooling cylinder, a certain resistance is imposed on the extrusion block, which hinders the rotation of the extrusion block. However, the magnetic force can overcome the resistance, so that the extrusion block can rotate stably.

[0024] 3. The extrusion block includes a rotating block and a cam, and the rotating block and the cam are detachably connected. By adjusting the angle of the cam relative to the rotating block, the degree of extrusion of the cam on the cooling cylinder can be adjusted, and then the angle of the extrusion block can be adjusted according to the size of the cooling cylinder, so that the extrusion block has better adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the polyethylene plastic edge material recovery extruder according to an embodiment of the present application.

[0026] Figure 2 yes Figure 1 The enlarged view of the part A of the polyethylene plastic edge material recycling extruder is shown.

[0027] Figure 3 It is a schematic diagram of the structure of the screw rod of an embodiment of the present application.

[0028] Figure 4 It is a schematic diagram of the structure of the mounting frame, feed hopper and cooling cylinder of an embodiment of the present application.

[0029] Figure 5 yes Figure 4 Top view of mounting frame, feed hopper and cooling cylinder shown.

[0030] Figure 6 yes Figure 5The BB sectional view of the mounting frame, feed hopper and cooling cylinder is shown.

[0031] Figure 7 yes Figure 6 A partial enlarged view of point C in the cross-sectional view shown.

[0032] Description of reference numerals:

[0033] 1. Frame; 11. Mounting frame; 111. Loading plate; 112. Guide ring; 2. Extrusion pipe; 21. Screw; 3. Heating mechanism; 4. Feed hopper; 41. First feed pipe; 42. Second feed pipe; 5. Cooling mechanism; 51. Cooling cylinder; 511. Accommodating chamber; 512. Heat conducting plate; 513. Heat insulating cover; 514; Inlet and outlet pipe; 52. Extrusion block; 521. Rotating block; 5211. First magnetic block; 522. Cam; 6. Scraping mechanism; 61. Scraping rod; 611. Second magnetic block; 7. Driving mechanism; 71. Driving unit; 72. First pulley; 73. Second pulley; 74. Synchronous belt; 75. Connecting rod; 76. Connecting ring. DETAILED DESCRIPTION

[0034] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. In addition, the terms "vertical", "horizontal", "upper", "lower" and similar expressions used in the present application are positional relationships with reference to the accompanying drawings, and do not represent the expression of the only embodiment.

[0035] The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings.

[0036] Reference Figure 1 and Figure 2 The embodiment of the present application discloses a polyethylene plastic edge material recycling extruder, comprising a frame 1 and an extrusion pipe 2 fixed on the frame 1, the axis of the extrusion pipe 2 is horizontally arranged, and a plurality of heating mechanisms 3 are connected to the extrusion pipe 2. A feed hopper 4 is connected above the extrusion pipe 2, the feed hopper 4 is located at one end of the extrusion pipe 2 in the horizontal direction, and the feed hopper 4 is connected to the extrusion pipe 2.

[0037] Reference Figure 1 and Figure 3 A screw 21 is rotatably arranged in the extrusion pipe 2, and the diameter of the screw 21 gradually increases along the conveying direction of the plastic, thereby meeting the changing requirements of the extrusion force at different stages of the plastic melting. The specific structural type of the screw 21 can refer to the conventional screw 21 extruder, and this embodiment will not be repeated here.

[0038] Reference Figure 4 , Figure 5 and Figure 6 The feed hopper 4 includes a first feed pipe 41 and a second feed pipe 42, which are coaxially arranged. The first feed pipe 41 is connected between the second feed pipe 42 and the extrusion pipe 2. That is, the first feed pipe 41 is located below the second feed pipe 42. The first feed pipe 41 is a cylindrical pipe with a uniform inner diameter, and the second feed pipe 42 is a conical pipe. The inner diameter of the second feed pipe 42 gradually increases in the direction away from the extrusion pipe 2, that is, the top opening of the second feed pipe 42 is larger than the bottom opening, so that it is convenient to put the crushed polyethylene plastic into the feed hopper 4, and then it is easy to feed into the extrusion pipe 2.

[0039] Reference Figure 4 and Figure 6 Since the first feed pipe 41 is close to the extrusion pipe 2 and is severely affected by the high temperature, the first feed pipe 41 is cooled efficiently by water, and the first feed pipe 41 is a straight pipe, which is convenient for designing the structure of the water cooling device. The second feed pipe 42 is far from the extrusion pipe 2 and is less affected by the high temperature, and the second feed pipe 42 is conical, so it is not easy to design an appropriate water cooling device. Therefore, in this embodiment, the inner wall of the second feed pipe 42 is scraped to prevent the plastic from sticking to the inner wall of the second feed pipe 42, thereby reducing the possibility of clogging of the feed hopper 4.

[0040] Reference Figure 6 and Figure 7 In order to achieve water cooling of the first feed pipe 41 and scraping action of the second feed pipe 42, the polyethylene plastic edge material recovery extruder in this embodiment also includes a cooling mechanism 5 and a scraping mechanism 6.

[0041] Reference Figure 6 and Figure 7 The cooling mechanism 5 includes a cooling cylinder 51 and an extrusion block 52. The cooling cylinder 51 is sleeved on the outside of the first feed pipe 41. The cooling cylinder 51 has a receiving cavity 511 surrounding the first feed pipe 41, and the receiving cavity 511 is used to fill the cooling liquid. The cooling cylinder 51 is elastic, and the extrusion block 52 is used to squeeze the top side of the cooling cylinder 51. By driving the extrusion block 52 to rotate around the axis of the first feed pipe 41, the extrusion block 52 can be rotated along the axis of the cooling cylinder 51, and then under the extrusion and rotation of the extrusion block 52, the cooling liquid in the cooling cylinder 51 can fluctuate, so that the cooling liquid in the cooling cylinder 51 fully absorbs the heat of the second feed pipe 42 during the movement. If the cooling liquid in the cooling cylinder 51 remains stationary, it is easy to cause the problem of uneven temperature of the cooling liquid in the cooling cylinder 51, thereby causing insufficient cooling of the first feed pipe 41. The cooling mechanism 5 of this embodiment effectively avoids this problem.

[0042] Reference Figure 6 and Figure 7In order to achieve sufficient heat conduction, the cooling cylinder 51 includes a heat conducting sheet 512 and a heat insulating cover 513. The heat conducting sheet 512 is annular and fits on the outer side of the first feed pipe 41. The heat insulating cover 513 is connected to the side of the heat conducting sheet 512 away from the first feed pipe 41, that is, the heat insulating cover 513 is fixed on the outer circumferential wall of the heat conducting sheet 512. The heat insulating cover 513 is annular and has a cross-section similar to the shape of the letter C. The above-mentioned accommodating cavity 511 is between the heat insulating cover 513 and the heat conducting sheet 512. The heat conducting sheet 512 can be selected as a metal sheet, which can improve the thermal conductivity while ensuring a certain rigidity. The metal heat conducting sheet 512 can stably contact the outer wall of the first feed hopper 4 and is not easy to separate. The heat insulating cover 513 can be selected as a rubber cover, and the specific material can be polyurethane rubber, so that the heat insulating cover 513 can have high elasticity while ensuring a certain heat insulation effect. The heat insulating cover 513 makes it difficult for the heat absorbed by the coolant to dissipate outward.

[0043] Reference Figure 4 and Figure 6 The heat shield 513 is connected with an inlet and outlet pipe 514, so that after the coolant has been used for a long time and is difficult to play a cooling role, new coolant is replaced through the inlet and outlet pipe 514. A valve for controlling opening and closing is provided on the inlet and outlet pipe 514.

[0044] Reference Figure 6 In order to support the cooling cylinder 51 , a mounting frame 11 is fixed on the frame 1 , a bearing plate 111 is fixed on the mounting frame 11 , and the cooling cylinder 51 is placed on the bearing plate 111 .

[0045] Reference Figure 7 The extrusion block 52 includes a rotating block 521 and a cam 522. The rotating block 521 is slidably fitted to the outer wall of the second feed tube 42, and the cam 522 is used to extrude the cooling cylinder 51. Since the cam 522 has resistance in the process of extruding the cooling cylinder 51, the rotating block 521 is fitted to the second feed tube 42 and rotated, which can improve the stability of the rotating block 521 when rotating. The cam 522 is detachably connected to the rotating block 521. Specifically, the rotating block 521 can be detachably connected to the rotating block 521 by bolts. The angle of the cam 522 relative to the rotating block 521 can be adjusted by bolts, so that the degree of extrusion of the cooling cylinder 51 by the cam 522 can be adjusted.

[0046] Reference Figure 6 The scraping mechanism 6 includes a scraping rod 61, which is slidably attached to the inner wall of the second feed pipe 42. By driving the scraping rod 61 to rotate around the axis of the second feed pipe 42, the scraping rod 61 can continuously scrape the inner wall of the second feed pipe 42, thereby reducing the possibility of plastic sticking in the second feed pipe 42.

[0047] Reference Figure 2 and Figure 6In order to facilitate the driving of the scraper rod 61 and the extrusion block 52 to rotate, the polyethylene plastic edge material recovery extruder in this embodiment also includes a driving mechanism 7, which is used to drive the extrusion block 52 and the scraper rod 61 to rotate around the axis of the feed hopper 4 at the same time.

[0048] Reference Figure 2 and Figure 6 The driving mechanism 7 includes a driving part 71, a first pulley 72, a second pulley 73 and a synchronous belt 74. The driving part 71 is a reduction motor. The reduction motor has two output shafts, one of which is connected to the screw 21 by transmission, and the other output shaft of the reduction motor is connected to the first pulley 72 by transmission through a bevel gear transmission group. The bevel gear transmission group is a conventional staggered axis transmission method. It should be understood that other staggered axis transmission methods can also be used instead, and this embodiment does not limit this. The synchronous belt 74 is sleeved on the first pulley 72 and the second pulley 73, and the scraper rod 61 and the extrusion block 52 are both connected to the second pulley 73. A guide ring 112 is fixed on the mounting frame 11, and the second pulley 73 is rotatably connected to the top of the guide ring 112. A connecting rod 75 is fixedly connected between the second pulley 73 and the rotating block 521, and a connecting ring 76 is fixedly connected between the second pulley 73 and the scraper rod 61.

[0049] Reference Figure 7 In order to improve the stability of the scraper rod 61 and the rotating block 521 during rotation, the rotating block 521 is connected to a first magnetic block 5211, and the scraper rod 61 is connected to a second magnetic block 611, and there is magnetic attraction between the first magnetic block 5211 and the second magnetic block 611. This can further ensure that the scraper rod 61 is stably attached to the inner wall of the second feeding tube 42 during rotation, and ensure the stability of the extrusion block 52 during rotation.

[0050] The implementation principle of the polyethylene plastic scrap recycling extruder of the embodiment of the present application is as follows: the recycled waste plastic scraps are crushed and put into the feed hopper 4, and the waste plastic scraps pass through the second feed pipe 42 and the first feed pipe 41 in turn and fall into the extrusion pipe 2, the drive unit 71 drives the screw 21 to rotate, the screw 21 drives the plastic forward and extrude the plastic, and under the heating action of the heating mechanism 3, the recycled waste plastic is melted during the feeding process.

[0051] During the operation of the driving unit 71, the first pulley 72 is driven to rotate simultaneously. The first pulley 72 drives the second pulley 73 to rotate through the synchronous belt 74. The second pulley 73 simultaneously drives the scraper rod 61 and the connecting rod 75 to rotate around the axis of the feed hopper 4. When the scraper rod 61 rotates, the plastic attached to the inner wall of the second feed pipe 42 is scraped off, thereby reducing the possibility of the plastic sticking to the inner wall of the second feed hopper 4.

[0052] The rotation of the connecting rod 75 drives the rotating block 521 to rotate at the same time. The rotating block 521 and the scraper rod 61 can rotate only by fitting on the second feed tube 42 through magnetic attraction, thereby improving the stability of the rotation of the rotating block 521 and the scraper rod 61, and avoiding deformation of the scraper rod 61 during the collision with the plastic in the second feed tube 42 as much as possible. The rotating block 521 drives the cam 522 to rotate during the rotation. Since the cam 522 has an extrusion force on the cooling cylinder 51, the coolant in the cooling cylinder 51 is driven out during the rotation of the cam 522, so that the coolant in the cooling cylinder 51 can flow in an orderly manner around the first feed tube 41, so that the coolant can fully absorb the heat on the first feed tube 41 during the orderly flow, and effectively cool down the first feed tube 41.

[0053] By combining scraping and water cooling, only the first feed pipe 41 close to the extrusion pipe 2 needs to be water-cooled, thereby reducing the cooling range of the cooling mechanism 5 and reducing the cost of the cooling mechanism 5. The scraper 61 and the extrusion block 52 use the same driving mechanism 7, which can achieve orderly disturbance of the coolant in the cooling cylinder 51, omitting the use of a pump driving method to achieve the circulation of the coolant, thereby saving cost and energy.

[0054] The present application adopts respective adaptive anti-adhesion structures according to the different cooling requirements and the structural characteristics of the first feed pipe 41 and the second feed pipe 42. Specifically, the temperature of the first feed pipe is easy to increase while the temperature of the second feed pipe is not easy to increase. The first feed pipe is a straight tube, which is convenient for designing a water cooling mechanism. The second feed pipe is a tapered tube, which is relatively special and not easy to design a more adaptive water cooling mechanism. Therefore, the present application can effectively reduce the possibility of plastic adhesion to the feed hopper 4 during the extruder feeding process, resulting in feed blockage, while reducing the manufacturing cost of the extruder, and having the effect of energy saving and material reduction.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A polyethylene plastic edge material recovery extruder, characterized in that: include: An extrusion pipe (2), wherein a screw (21) is rotatably arranged in the extrusion pipe (2); a feed hopper (4), the feed hopper (4) being located at one end of the extrusion pipe (2), the feed hopper (4) being in communication with the extrusion pipe (2); the feed hopper (4) comprising a first feed pipe (41) and a second feed pipe (42), the first feed pipe (41) being in communication between the second feed pipe (42) and the extrusion pipe (2); A cooling mechanism (5), comprising a cooling cylinder (51) and an extrusion block (52), wherein the cooling cylinder (51) is sleeved on the outside of the first feed pipe (41), the cooling cylinder (51) has a receiving cavity (511) surrounding the first feed pipe (41), the receiving cavity (511) is used to be filled with a cooling liquid, the cooling cylinder (51) is elastic, and the extrusion block (52) is used to extrude the cooling cylinder (51); a scraping mechanism (6), comprising a scraping rod (61), wherein the scraping rod (61) is slidably fitted to the inner wall of the second feeding pipe (42); and A driving mechanism (7) for driving the extrusion block (52) and the scraper rod (61) to rotate around the axis of the feed hopper (4) simultaneously; The extrusion block (52) comprises a rotating block (521) and a cam (522); the driving mechanism (7) is transmission-connected to the rotating block (521); the cam (522) is detachably connected to the rotating block (521); the cam (522) is used to extrude the cooling cylinder (51); and the degree of extrusion of the cooling cylinder (51) by the cam (522) is adjustable.

2. The polyethylene plastic edge material recovery extruder according to claim 1, characterized in that: The driving mechanism (7) comprises a driving part (71), a first pulley (72), a second pulley (73) and a synchronous belt (74); the synchronous belt (74) is sleeved on the first pulley (72) and the second pulley (73); the driving part (71) is transmission-connected to the first pulley (72); the scraper rod (61) and the extrusion block (52) are both connected to the second pulley (73).

3. The polyethylene plastic edge material recovery extruder according to claim 2, characterized in that: The driving part (71) is drivingly connected to the screw rod (21).

4. The polyethylene plastic edge material recovery extruder according to claim 1, characterized in that: The inner diameter of the second feeding pipe (42) gradually increases in a direction away from the extrusion pipe (2).

5. The polyethylene plastic edge material recovery extruder according to claim 1, characterized in that: The rotating block (521) is slidably fitted on the outer wall of the second feeding pipe (42).

6. The polyethylene plastic edge material recovery extruder according to claim 5, characterized in that: The rotating block (521) is connected to a first magnetic block (5211), the scraper rod (61) is connected to a second magnetic block (611), and there is magnetic attraction between the first magnetic block (5211) and the second magnetic block (611).

7. The polyethylene plastic edge material recovery extruder according to claim 6, characterized in that: The first magnetic block (5211) and the second magnetic block (611) are both close to the bottom end of the second feeding pipe (42).

8. The polyethylene plastic edge material recovery extruder according to claim 1, characterized in that: The cooling cylinder (51) comprises a heat conducting plate (512) and a heat insulating cover (513); the heat conducting plate (512) is annular and fits the outer side of the first feed pipe (41); the heat insulating cover (513) is connected to the side of the heat conducting plate (512) facing away from the first feed pipe (41); the accommodating cavity (511) is formed between the heat insulating cover (513) and the heat conducting plate (512).

9. The polyethylene plastic edge material recovery extruder according to claim 8, characterized in that: The heat conducting sheet (512) is a metal sheet, and the heat insulating cover (513) is a rubber cover.

Images