Polyethylene particle preparation process

Abstract

The invention relates to the field of polyethylene particle preparation, in particular to a polyethylene particle preparation process. Comprising a material conveying pipe and a communicating pipe fixedly connected to the upper portion of the material conveying pipe, one side of a discharging port of the communicating pipe is fixedly connected with an end frame I, the end frame I is fixedly connected with a rotary frame, the end frame I is rotationally connected with a switching frame, the switching frame is fixedly connected with a plurality of granulation plates which can coincide with the axis of the material conveying pipe, and each granulation plate is provided with a plurality of granulation holes. The end frame I is fixedly connected with a gear motor II driving the switching frame to rotate, the other end of the material conveying pipe is fixedly connected with an end frame II, the end frame II is rotationally connected with a spiral frame attached to the inner wall of the material conveying pipe to push polyethylene particle raw materials to be conveyed, and the end frame II is fixedly connected with a gear motor I driving the spiral frame to rotate. And the positions of particle forming parts can be replaced, dredging and cleaning can be conducted, and the preparation speed and effect of polyethylene particles are ensured.

Description

Technical Field

[0001] The invention relates to the field of polyethylene particle preparation, and more specifically to a polyethylene particle preparation process. Background Art

[0002] Polyethylene is a polymer with the simplest structure formed by the combination of ethylene. It is relatively soft and feels waxy. Compared with the same plastic, it is relatively light and has a certain degree of transparency. Polyethylene particles can be used to make plastic wrap, vest-type plastic bags, plastic food bags, baby bottles, buckets, kettles, films, etc. Generally, old polyethylene plastics are recycled to make polyethylene plastic particles, and then polyethylene plastic particles are used as raw materials for plastic food bags, etc., thereby reducing production costs. The processing method of polyethylene plastic particles is as follows: the waste polyethylene is crushed, cleaned, dehydrated and dried to obtain waste polyethylene raw materials; the waste polyethylene raw materials and the antioxidant with a mass of 1.5%-4% of the waste polyethylene raw materials and the anti-ultraviolet agent with a mass of 0.1%-3% of the waste polyethylene raw materials are mixed at high speed at room temperature; the uniformly mixed materials are melted and extruded by a co-rotating twin screw, stretched, pelletized, and vacuum dried to obtain a matrix masterbatch. However, in the prior art, the parts used to form particles for extrusion of the material are fixed, and the extrusion holes are easily blocked, which cannot ensure the preparation speed and effect of polyethylene particles. Summary of the invention

[0003] In order to improve the deficiencies of the prior art, the present invention provides a polyethylene particle preparation process, which can replace the position of parts of the formed particles and perform dredging and cleaning, thereby ensuring the preparation speed and effect of the polyethylene particles.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A polyethylene granule preparation process comprises a material transport pipe and a connecting pipe fixedly connected to the upper part of the material transport pipe, an end frame I is fixedly connected to one side of the material outlet of the connecting pipe, a rotating frame is fixedly connected to the end frame I, a switching frame is rotatably connected to the end frame I, a plurality of granulation plates that can coincide with the axis of the material transport pipe are fixedly connected to the switching frame, a plurality of granulation holes are arranged on each granulation plate, a reduction motor II is fixedly connected to the end frame I for driving the switching frame to rotate, the other end of the material transport pipe is fixedly connected to the end frame II, a spiral frame that fits the inner wall of the material transport pipe and promotes the transportation of polyethylene granule raw materials is rotatably connected to the end frame II, and a reduction motor I is fixedly connected to the end frame II for driving the spiral frame to rotate.

[0006] Furthermore, a push plate is slidably connected between the spiral frame and the material transport pipe, and two cylinders I are fixedly connected to the end frame II for driving the push plate to slide back and forth.

[0007] Furthermore, a side frame is fixedly connected to the end frame I, a cylinder II is fixedly connected to the side frame, and a cutting knife is fixedly connected to the cylinder rod of the cylinder II.

[0008] Furthermore, the cutting knife is fixedly connected to two guide rods which are slidably connected to the side frame.

[0009] Furthermore, a cylinder III is fixedly connected to the end frame I, a circular plate is fixedly connected to the cylinder rod of the cylinder III, a plurality of cleaning rods are fixedly connected to the circular plate, and the plurality of cleaning rods correspond one by one to the corresponding plurality of granulation holes.

[0010] Further, according to the above-mentioned polyethylene particle preparation process, the process comprises the following steps:

[0011] Step 1: Add the melted fluid material into the connecting pipe, drive the spiral frame to rotate, and push the material out for granulation;

[0012] Step 2: Cutting and shaping the materials extruded from the multiple granulation holes to complete the preparation of polyethylene particles;

[0013] Step 3: driving the switching frame to rotate and drive the multiple granulation plates to switch positions, and cleaning the multiple granulation holes on the switched granulation plates;

[0014] Step 4: Repeat steps 1, 2 and 3 to continuously prepare polyethylene particles.

[0015] The beneficial effects of the polyethylene particle preparation process of the present invention are: the structure of the formed particles can be replaced and unblocked and cleaned to ensure the preparation speed and effect of the polyethylene particles; the material in the tubular container can be pushed out by the rotation of the spiral blade and the sliding of the circular plate, and the rapid preparation of the polyethylene particles can be achieved by cooperating with the sliding of the cutting knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0017] Figure 1 It is a schematic diagram of the structure of preparing polyethylene particles;

[0018] Figure 2 It is a schematic diagram of the structure of extruded material molding;

[0019] Figure 3 A schematic diagram of the structure to facilitate material transportation;

[0020] Figure 4 Schematic diagram of the position structure of the push plate;

[0021] Figure 5 It is a structural schematic diagram of cutting materials;

[0022] Figure 6 A schematic diagram of the structure of the spray-cleaned shaped particles;

[0023] Figure 7Schematic diagram of the structure for cleaning blocked materials.

[0024] In the figure: material transport pipe 11; connecting pipe 12; end frame II 13; end frame I 14; side frame 15; rotating frame 16; spiral frame 21; reduction motor I 22; push plate 23; cylinder I 24; cylinder II 31; guide rod 32; cutting knife 33; switching frame 41; granulation plate 42; reduction motor II 43; granulation hole 44; supply pipe 51; spray pipe 52; cylinder III 61; round plate 62; slide rod 63; cleaning rod 64. DETAILED DESCRIPTION

[0025] refer to Figure 1 , 2 , 3, 4 and 5, detailed description of the examples of preparing polyethylene particles:

[0026] A polyethylene granule preparation process comprises a material transport pipe 11 and a connecting pipe 12 fixedly connected to the upper part of the material transport pipe 11. The mixed and heated melted materials are added into the material transport pipe 11 from the connecting pipe 12 for transportation. An end frame Ⅰ14 is fixedly connected to one side of the material outlet of the connecting pipe 12. A rotating frame 16 is fixedly connected to the end frame Ⅰ14. A switching frame 41 is rotatably connected to the end frame Ⅰ14. A plurality of granulating plates 42 that can coincide with the axis of the material transport pipe 11 are fixedly connected to the switching frame 41. A plurality of granulating holes 44 are arranged on each granulating plate 42, so that the material in the material transport pipe 11 is pushed out. The pushed out material is extruded from the plurality of granulating holes 44. After extrusion, the extruded material is cut into granules by cutting, so that the polyethylene granules are prepared after the granules are solidified. After long-term use, the granulating plates 42 and the plurality of granulating holes 44 are easily clogged due to the blockage of individual granulating holes 44, which affects the preparation speed and preparation effect of the polyethylene granules. Therefore, the plurality of granulating plates 42 are driven to switch. Then, the preparation speed and preparation effect of polyethylene particles can be ensured by recycling multiple granulation plates 42. The end frame Ⅰ14 is fixedly connected with a reduction motor Ⅱ43 that drives the switching frame 41 to rotate. The reduction motor Ⅱ43 is started, and the output shaft of the reduction motor Ⅱ43 drives the switching frame 41 to rotate. The switching frame 41 rotates and drives the granulation plate 42 to rotate, so that the granulation plate 42 can be switched, and the granulation plate 42 is clean, ensuring the preparation speed and preparation effect of polyethylene particles. The other end of the conveying pipe 11 is fixedly connected with the end frame Ⅱ13. The end frame Ⅱ13 is rotatably connected with a spiral frame 21 that fits the inner wall of the conveying pipe 11 and promotes the transportation of polyethylene particle raw materials. The end frame Ⅱ13 is fixedly connected with a reduction motor Ⅰ22 that drives the spiral frame 21 to rotate. The reduction motor Ⅰ22 is started, and the output shaft of the reduction motor Ⅰ22 drives the spiral frame 21 to rotate. The spiral frame 21 rotates and promotes the transportation of materials in the conveying pipe 11 for extrusion, and the polyethylene particles are continuously prepared.

[0027] refer to Figure 4, detailed description of the embodiment of promoting material extrusion to prepare polyethylene particles:

[0028] A push plate 23 is slidably connected between the spiral frame 21 and the material transport pipe 11, and two cylinders I24 are fixedly connected to the end frame II13 to drive the push plate 23 to slide back and forth. When the two cylinders I24 are started, the cylinder rods of the two cylinders I24 drive the push plate 23 to slide back and forth. After the push plate 23 slides back and forth, it pushes the material to be extruded, thereby continuously preparing polyethylene particles.

[0029] refer to Figure 1 and 5 , details an example of cutting the extruded material to prepare polyethylene particles:

[0030] The end frame I 14 is fixedly connected to a side frame 15, and a cylinder II 31 is fixedly connected to the side frame 15. A cutting knife 33 is fixedly connected to the cylinder rod of the cylinder II 31. The cutting knife 33 is fixedly connected to two guide rods 32 that are slidably connected to the side frame 15. When the cylinder II 31 is started, the cylinder rod of the cylinder II 31 drives the cutting knife 33 to slide back and forth. The cutting knife 33 cuts the extruded material under the condition that the side frame 15 limits and guides the two guide rods 32. When the cutting knife 33 cuts the material and resets, the spiral frame 21 notifies to rotate, thereby resetting. The cutting knife 33 and the spiral frame 21 work alternately to ensure that the spiral frame 21 rotates to push the material to extrude. The spiral frame 21 stops rotating and stops pushing the material. The cutting knife 33 slides to cut the material. The cutting knife 33 resets and the spiral frame 21 starts to rotate to push the material to extrude the cycle process, ensuring the preparation of polyethylene particles.

[0031] refer to Figure 1 and 7 , an embodiment of cleaning the switched granulating plate 42 is described in detail:

[0032] The end frame Ⅰ14 is fixedly connected with a cylinder III 61, and a circular plate 62 is fixedly connected to the cylinder rod of the cylinder III 61, and a plurality of cleaning rods 64 are fixedly connected to the circular plate 62, and the plurality of cleaning rods 64 correspond to the corresponding plurality of granulation holes 44 one by one. The circular plate 62 is fixedly connected with two sliding rods 63 slidably connected with the end frame Ⅰ14, and the cylinder III 61 is started, and the cylinder rod of the cylinder III 61 drives the circular plate 62 to slide back and forth under the guidance of the sliding rods 63 by the end frame Ⅰ14, and the circular plate 62 drives the plurality of cleaning rods 64 to insert into the plurality of granulation holes 44, and clean the plurality of granulation holes 44, so as to ensure the effect of preparing polyethylene particles.

[0033] refer to Figure 1 and 6 , an embodiment of the granulation hole 44 after cleaning is described in detail:

[0034] The end frame Ⅰ14 is fixedly connected with a supply pipe 51, and a spray pipe 52 is fixedly connected with the supply pipe 51. The supply pipe 51 is communicated with an external cleaning liquid supply device, and a pump is provided on the supply pipe 51. The end of the spray pipe 52 is provided with a plurality of high-pressure atomizing nozzles. The pump can increase the pressure of the transported liquid so that the liquid is sprayed out from the spray pipe 52 at high pressure, so that the cleaning liquid is supplied to the supply pipe 51 through the external cleaning liquid supply device, and sprayed out through the spray pipe 52, so as to clean the granulation holes 44 after the plurality of cleaning rods 64 are inserted into the plurality of granulation holes 44.

[0035] refer to Figure 5 , an example of cutting extruded material is described in detail:

[0036] The cutting knife 33 is arc-shaped and is provided with a circular blade. The blade diameter of the cutting knife 33 is larger than the diameter of the inner wall of the material conveying pipe 11, so that when the cutting knife 33 slides, the cutting knife 33 can fully cut the material extruded from the granulation hole 44 to prepare polyethylene particles.

[0037] refer to Figure 1 , 2 , 6 and 7, detailed description of the examples of preparing polyethylene particles:

[0038] According to the above-mentioned polyethylene particle preparation process, the process comprises the following steps:

[0039] Step 1: Add the melted material into the connecting pipe 12, drive the spiral frame 21 to rotate, push the material out for granulation, and realize continuous transportation of the material;

[0040] Step 2: The material extruded from the plurality of granulation holes 44 is cut and shaped to complete the preparation of polyethylene particles. By extruding a cylindrical material and cutting it during extrusion, the wear of the cutting tool is reduced, and the processing can be more convenient, and the prepared polyethylene particles are easy to store;

[0041] Step 3: driving the switching frame 41 to rotate and drive the multiple granulation plates 42 to switch positions, and cleaning the multiple granulation holes 44 on the switched granulation plates 42, so as to ensure the quality of the polyethylene granules;

[0042] Step 4: Repeat steps 1, 2 and 3 to continuously prepare polyethylene particles.

Claims

1. A process for preparing polyethylene particles, Features: The invention comprises a material transport pipe (11) and a connecting pipe (12) fixedly connected to the upper part of the material transport pipe (11); an end frame I (14) is fixedly connected to one side of the material outlet of the connecting pipe (12); a rotating frame (16) is fixedly connected to the end frame I (14); a switching frame (41) is rotatably connected to the end frame I (14); a plurality of granulating plates (42) that can coincide with the axis of the material transport pipe (11) are fixedly connected to the switching frame (41); each granulating plate (42) is provided with A plurality of granulation holes (44) are arranged, a reduction motor II (43) is fixedly connected to the end frame I (14) for driving the switching frame (41) to rotate, the other end of the material transport pipe (11) is fixedly connected to the end frame II (13), a spiral frame (21) is rotatably connected to the end frame II (13) and is in contact with the inner wall of the material transport pipe (11) to push the polyethylene granule raw material to be transported, and a reduction motor I (22) is fixedly connected to the end frame II (13) for driving the spiral frame (21) to rotate.

2. A process for preparing polyethylene particles according to claim 1, Features: A push plate (23) is slidably connected between the spiral frame (21) and the material transport pipe (11), and two cylinders I (24) for driving the push plate (23) to slide back and forth are fixedly connected to the end frame II (13).

3. A process for preparing polyethylene particles according to claim 1, Features: The end frame I (14) is fixedly connected to a side frame (15), the side frame (15) is fixedly connected to a cylinder II (31), and a cutting knife (33) is fixedly connected to the cylinder rod of the cylinder II (31).

4. A process for preparing polyethylene particles according to claim 3, Features: The cutting knife (33) is fixedly connected to two guide rods (32) which are slidably connected to the side frame (15).

5. A process for preparing polyethylene particles according to claim 1, Features: The end frame I (14) is fixedly connected to a cylinder III (61), a cylinder rod of the cylinder III (61) is fixedly connected to a circular plate (62), a plurality of cleaning rods (64) are fixedly connected to the circular plate (62), and the plurality of cleaning rods (64) correspond one to one to the corresponding plurality of granulation holes (44).

6. A process for preparing polyethylene particles according to claim 5, Features: The circular plate (62) is fixedly provided with two sliding rods (63) which are slidably connected to the end frame I (14).

7. A process for preparing polyethylene particles according to claim 1, Features: The end frame I (14) is fixedly connected with a supply pipe (51), and the supply pipe (51) is fixedly connected with a spray pipe (52).

8. A process for preparing polyethylene particles according to claim 7, Features: The supply pipe (51) is connected to an external cleaning liquid supply device, a pump is provided on the supply pipe (51), and a plurality of high-pressure atomizing nozzles are provided at the end of the spray pipe (52).

9. A process for preparing polyethylene particles according to claim 3, Features: The cutting knife (33) is arc-shaped and is provided with a circular blade. The diameter of the blade of the cutting knife (33) is greater than the diameter of the inner wall of the material transport pipe (11).

10. A process for preparing polyethylene particles according to any one of claims 1 to 9, It is characterized in that The process includes the following steps: Step 1: Add the melted material into the connecting pipe (12), drive the spiral frame (21) to rotate, and push the material out to granulate; Step 2: cutting and shaping the materials extruded from the plurality of granulation holes (44) to complete the preparation of polyethylene granules; Step 3: driving the switching frame (41) to rotate and drive the plurality of granulation plates (42) to switch positions, and cleaning the plurality of granulation holes (44) on the switched granulation plates (42); Step 4: Repeat steps 1, 2 and 3 to continuously prepare polyethylene particles.

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