A method for producing low-temperature resistant plastic granules for pipes

Abstract

This invention discloses a method for producing low-temperature resistant plastic granules for pipes, comprising the following steps: Step 1, cleaning the waste material, and then adding the raw material to a high-speed mixer to obtain a premix; Step 2, adding the premix to a twin-screw extruder and heating it to a molten state for plasticization. This invention relates to the field of plastic granule preparation technology. In this method for producing low-temperature resistant plastic granules for pipes, wastewater is discharged into a circulation tank, driving a turbulence impeller to rotate. While the wastewater is filtered through a grading filter plate, a scraper removes dirt from the surface of the grading filter plate, preventing clogging. Furthermore, the drainage area of ​​the drainage channel can be increased by adjusting the water flow, increasing the water pressure and the impact force on the turbulence impeller, thus increasing the thrust on the scraper and improving the cleaning effect.

Description

Technical Field

[0001] This invention relates to the field of plastic granule preparation technology, specifically a method for producing low-temperature resistant plastic granules for pipes. Background Technology

[0002] When processing low-temperature resistant pipe plastic granules, most of the recycling of old low-temperature resistant plastics requires modification of the waste low-temperature resistant plastics. Currently, the processing of recycled plastic products requires cutting and washing operations. The washing tank needs to be filled with water during the washing process. This method cannot be adjusted according to the actual amount of plastic to be washed and has poor washing convenience. Therefore, a plastic recycling granule production device and preparation method are proposed to solve the problem of convenient washing of recycled plastic products and avoid certain resource waste.

[0003] According to the apparatus and method for producing plastic recycling pellets described in patent number CN114953266B, the effect of wastewater recycling is poor during use, and the output plastic pellets have a high water content, making subsequent processing troublesome. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for producing low-temperature resistant plastic granules for pipes, thus solving the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for producing low-temperature resistant plastic granules for pipes, comprising the following steps:

[0006] Step 1: Clean the waste material. After cleaning, add the raw material to a high-speed mixer to obtain a premix.

[0007] Step 2: Add the premixed material to the twin-screw extruder and heat it to a molten state for plasticization;

[0008] Step 3: Extrude the melt into strip-shaped structures using an extruder and allow it to cool and harden.

[0009] Step 4: Perform cold pressing and hot pressing processes;

[0010] Step 6: Granulate the pellets using a pelletizer and then sieve them to obtain the finished product.

[0011] As a further aspect of the present invention: when cleaning the waste in step one, it is first pre-cleaned by a pre-treatment device, then finely cleaned, and finally output after centrifugation to remove water.

[0012] As a further aspect of the present invention: in step one, the wastewater generated during waste cleaning is circulated through the circulation tank of the pretreatment equipment.

[0013] As a further aspect of the present invention: during the pre-cleaning process in step one, plastic granules are fed into the feed box. The pull rope is pulled by the take-up reel to move the movable filter plate. After the plastic granules are cleaned, the movable filter plate is lowered to discharge the material. The vibration can effectively discharge debris and homogenize the plastic, allowing more plastic to be rinsed. At this time, the spray plate at the top of the feed box cavity sprays water to initially rinse the plastic. The cleaned plastic granules enter the cleaning box from the discharge port on one side of the feed box.

[0014] As a further aspect of the present invention: during the fine cleaning in step one, the cleaning is performed using the cleaning components inside the cleaning tank.

[0015] As a further aspect of the present invention: during centrifugal dewatering in step one, the plastic is lifted out of the washing tank by setting the plastic frame, the plastic particles fall into the centrifuge drum, the centrifuge drum rotates to discharge the water, and then the solenoid valve in the discharge channel is opened. When the centrifuge drum rotates, the plastic particles inside are discharged from the discharge channel through the hole of the collar.

[0016] As a further aspect of the present invention: during the circulation process in step one, the sewage is transported to the circulation tank through the drainage channel, which drives the turbulence impeller to rotate. While the sewage is being filtered through the graded filter plate, a scraper is used to scrape off the dirt on the surface of the graded filter plate to prevent the graded filter plate from clogging. The dirt is scraped into the storage tank for storage. After being filtered through the filter screen, the water is transported to the cleaning tank through the return pipe. A switch valve is provided on one side of the storage tank to open and discharge the accumulated dirt inside at regular intervals for cleaning.

[0017] As a further aspect of the present invention: during the cyclic processing in step one, the expansion airbag is guided by a guide rod so that it can only contract and expand in the direction of the guide rod. An electric actuator is provided on one side of the drainage channel to drive the expansion airbag, which pushes the expansion airbag to expand and contract in the drainage channel to regulate the water flow. When dirt accumulates on the surface of the graded filter plate, the expansion airbag is driven to contract, increasing the drainage area of ​​the drainage channel, increasing the water pressure, increasing the impact force on the turbulence impeller, and increasing the thrust on the scraper.

[0018] The pretreatment equipment includes a washing tank, a feeding tank, and a circulation tank. The feeding tank is positioned above the washing tank for preliminary washing of the raw materials. The washed wastewater is then circulated through the circulation tank. The pre-washed plastic is then transported back to the washing tank for further cleaning. A movable filter plate is rotatably mounted inside the feeding tank. A motor-driven take-up reel is located at the top of the feeding tank, with a pull rope connected to its surface. One end of the pull rope passes through and extends into the inner cavity of the feeding tank, movably mounted to the inner cavity. One end of the pull rope is fixedly connected to one side of the movable filter plate. Pulling the pull rope via the take-up reel moves the movable filter plate, cleaning the plastic granules. After cleaning, the movable filter plate is lowered for unloading. It can effectively vibrate and discharge debris and homogenize the plastic discharge, allowing for more plastic to be washed. At this time, the spray plate at the top of the feed box provides initial rinsing of the plastic. The bottom of the feed box is connected to the inner cavity of the circulation box via a drainage channel, and wastewater is transported to the circulation box through the drainage channel. The washed plastic particles enter the washing box from the discharge port on one side of the feed box. A turbulence impeller is rotatably installed inside the circulation box, and a scraper is fixedly connected to the bottom of the turbulence impeller via a connecting shaft. A grading filter plate is installed inside the circulation box, and the surface of the connecting shaft is rotatably connected to the inner cavity of the grading filter plate. The scraper abuts against the surface of the grading filter plate. Wastewater is discharged into the circulation box, driving the turbulence impeller to rotate, and then... While filtering wastewater, the graded filter plate uses a scraper to remove dirt from its surface, preventing clogging. A storage tank is located on the left side of the circulation tank, with its connection to the circulation tank situated above one side of the graded filter plate. A return pipe connects to the bottom of the storage tank, with one end connected to the inner cavity of the cleaning tank. A filter screen is installed at the end of the return pipe within the storage tank. The connection between the return pipe and the storage tank is located above the cleaning tank. Dirt is scraped into the storage tank by the scraper for storage. Water, after being filtered by the filter screen, is transported to the cleaning tank through the return pipe. A valve is located on one side of the storage tank to periodically open and drain accumulated dirt for cleaning. The inner cavity of the drainage channel... An inflatable airbag and a guide rod are fixedly connected to each other. The guide rod guides the inflatable airbag, ensuring it can only contract and expand in the direction of the guide rod. An electric actuator is installed on one side of the drainage channel to drive the inflatable airbag, causing it to expand and contract within the drainage channel to regulate the water flow. When dirt accumulates on the surface of the grading filter plate, the inflatable airbag contracts, increasing the drainage area of ​​the drainage channel, increasing water pressure, increasing the impact force on the turbulence impeller, and increasing the thrust on the scraper, resulting in better cleaning. The circulation box and the feed box are connected by a pumped circulation pipe. A pneumatic ball valve is installed inside the circulation pipe. The inner cavity of the inflatable airbag is connected to the pneumatic chamber of the pneumatic ball valve through an air supply pipe. When the inflatable airbag contracts...With the increased drainage area of ​​the drainage channel, gas from the inflatable bladder is delivered to the pneumatic ball valve, widening its opening. The circulation pipe is also connected to an external water source, increasing the water inflow and spray intensity. This also increases the water flow into the drainage channel, making cleaning of the graded filter plates easier. After cleaning, the inflatable bladder expands, reducing the opening of the pneumatic ball valve and decreasing the water pressure to continue spray cleaning. The cleaning tank's inner cavity is equipped with a discharge conveyor belt, and the surface of the discharge conveyor belt is fitted with a plastic frame. The plastic frame holds the plastic... The material is lifted out of the washing tank for further processing. A drain tank is located on one side of the washing tank, and the right end of the discharge conveyor belt is positioned above the drain tank. A centrifuge drum driven by a motor is rotatably connected to the inner cavity of the drain tank. A collar fitted onto the surface of the centrifuge drum is fixedly connected to the inner cavity of the drain tank. One side of the collar is connected to a discharge channel. Plastic particles fall into the centrifuge drum, and as the drum rotates, water is discharged. Then, a solenoid valve in the discharge channel is opened, and as the centrifuge drum rotates, the plastic particles inside are discharged through the holes in the collar and out of the discharge channel.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. In this invention, wastewater is discharged into a circulation tank, which drives the turbulence impeller to rotate. While the wastewater is filtered through the graded filter plate, the dirt on the surface of the graded filter plate is scraped off by a scraper to prevent the graded filter plate from clogging. Furthermore, the drainage area of ​​the drainage channel can be increased by adjusting the water flow, thereby increasing the water pressure, increasing the impact force on the turbulence impeller, and increasing the thrust on the scraper, resulting in a better cleaning effect.

[0021] 2. In this invention, plastic particles fall into a centrifuge drum, the centrifuge drum rotates to discharge water, and then the solenoid valve in the discharge channel is opened. When the centrifuge drum rotates, the plastic particles inside are discharged from the discharge channel through the holes of the collar. This method has a better dewatering effect and is more convenient for subsequent processing.

[0022] 3. In this invention, the pull rope is pulled by the take-up reel to move the movable filter plate. After the plastic particles are cleaned, the movable filter plate is lowered to discharge the material. It can also vibrate to effectively discharge debris and homogenize the plastic discharge. It can accommodate more plastic for washing. At this time, the spray plate set at the top of the inner cavity of the feed box discharges water to initially wash the plastic. The cleaned plastic particles enter the cleaning box from the discharge port on one side of the feed box. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the pretreatment equipment of the present invention;

[0024] Figure 2 This is a schematic diagram of the pretreatment equipment of the present invention;

[0025] Figure 3 For the present invention Figure 1 A magnified view of a section at point A in the middle;

[0026] Figure 4 For the present invention Figure 1 A magnified view of a section at point B.

[0027] In the diagram: 1. Cleaning tank; 2. Feeding tank; 3. Movable filter plate; 4. Take-up reel; 5. Pull rope; 6. Circulation tank; 7. Drainage channel; 8. Guide rod; 9. Inflatable air bladder; 10. Electric actuator; 11. Turbulent impeller; 12. Connecting shaft; 13. Grading filter plate; 14. Scraper; 15. Storage tank; 16. Return pipe; 17. Circulation pipe; 18. Pneumatic ball valve; 19. Air supply pipe; 20. Discharge conveyor belt; 21. Plastic frame; 22. Water tank; 23. Guide frame; 24. Centrifuge cylinder; 25. Collar; 26. Discharge channel. Detailed Implementation

[0028] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0029] Please see Figure 1-4 This invention provides a technical solution: a method for producing low-temperature resistant plastic granules for pipes, comprising the following steps:

[0030] Step 1: Clean the waste material. After cleaning, add the raw material to a high-speed mixer to obtain a premix.

[0031] Step 2: Add the premixed material to the twin-screw extruder and heat it to a molten state for plasticization;

[0032] Step 3: Extrude the melt into strip-shaped structures using an extruder and allow it to cool and harden.

[0033] Step 4: Perform cold pressing and hot pressing processes;

[0034] Step 6: Granulate the pellets using a pelletizer and then sieve them to obtain the finished product.

[0035] In step one, when cleaning the waste, it is first pre-cleaned using pre-treatment equipment, then finely cleaned, and finally discharged after centrifugation to remove water.

[0036] In step one, the wastewater generated during the cleaning of waste materials is recycled through the circulation tank 6 of the pretreatment equipment.

[0037] During the pre-cleaning process in step one, plastic granules are fed into the feed box 2. The pull rope 5 is pulled by the take-up reel 4 to move the movable filter plate 3. After the plastic granules are cleaned, the movable filter plate 3 is lowered to discharge the material. It can also vibrate to effectively discharge debris and homogenize the plastic, allowing more plastic to be rinsed. At this time, the spray plate set at the top of the inner cavity of the feed box 2 sprays water to initially rinse the plastic. The cleaned plastic granules enter the cleaning box 1 from the discharge port on one side of the feed box 2.

[0038] During the detailed cleaning in step one, the cleaning is performed using the cleaning components inside the cleaning tank 1.

[0039] In step one, during centrifugal dewatering, the plastic is lifted out of the washing tank 1 by the plastic frame 21, and the plastic particles fall into the centrifuge drum 24. The centrifuge drum 24 rotates to discharge the water. Then, the solenoid valve in the discharge channel 26 is opened. When the centrifuge drum 24 rotates, the plastic particles inside are discharged from the hole of the collar 25 through the discharge channel 26 for discharge.

[0040] During the circulation process in step one, the wastewater is transported to the circulation tank 6 through the drainage channel 7, which drives the turbulence impeller 11 to rotate. While the wastewater is being filtered through the graded filter plate 13, the scraper 14 scrapes off the dirt on the surface of the graded filter plate 13 to prevent the graded filter plate 13 from clogging. The dirt is scraped into the storage tank 15 by the scraper 14 for storage. After being filtered by the filter screen, the water is transported to the cleaning tank 1 through the return pipe 16. A switch valve is provided on one side of the storage tank 15 to open and discharge the accumulated dirt inside for cleaning at regular intervals.

[0041] During the cyclic processing in step one, the expansion airbag 9 is guided by the guide rod 8 so that it can only contract and expand in the direction of the guide rod 8. An electric actuator 10 is provided on one side of the drainage channel 7 to drive the expansion airbag 9, which pushes the expansion airbag 9 to expand and contract in the drainage channel 7 to regulate the water flow. When dirt accumulates on the surface of the graded filter plate 13, the expansion airbag 9 is driven to contract, increasing the drainage area of ​​the drainage channel 7, increasing the water pressure, increasing the impact force on the turbulence impeller 11, and increasing the thrust on the scraper 14.

[0042] The pretreatment equipment includes a washing tank 1, a feeding tank 2, and a circulation tank 6. The feeding tank 2 is positioned above the washing tank 1 for preliminary washing of the raw materials. The washed wastewater is then circulated through the circulation tank 6. The pre-washed plastic is then transported back to the washing tank 1 for further washing. A movable filter plate 3 is rotatably mounted inside the feeding tank 2. A motor-driven take-up reel 4 is mounted on the top of the feeding tank 2. A pull rope 5 is connected to the surface of the take-up reel 4, with one end extending through and into the inner cavity of the feeding tank 2. The surface of the pull rope 5 is movably mounted within the inner cavity of the feeding tank 2. One end of the pull rope 5 is fixedly connected to one side of the movable filter plate 3. Pulling the pull rope 5 via the take-up reel 4 causes the movable filter plate 3 to move, cleaning the plastic particles and then retracting the movable filter plate 3. Plate 3 is lowered for material feeding, and the vibration effectively removes debris and homogenizes the plastic discharge, allowing for more plastic to be washed. At this time, the spray plate at the top of the inner cavity of the feed box 2 provides initial rinsing of the plastic. The bottom of the feed box 2 is connected to the inner cavity of the circulation box 6 via a drainage channel 7, and wastewater is transported to the circulation box 6 through the drainage channel 7. The washed plastic particles enter the cleaning box 1 from the discharge port on one side of the feed box 2. A turbulence impeller 11 is rotatably installed inside the circulation box 6, and a scraper 14 is fixedly connected to the bottom of the turbulence impeller 11 via a connecting shaft 12. A grading filter plate 13 is installed inside the circulation box 6, and the surface of the connecting shaft 12 is rotatably connected to the inner cavity of the grading filter plate 13. The scraper 14 is connected to the grading filter plate 13... The wastewater is discharged into the circulation tank 6, causing the impeller 11 to rotate. While the wastewater is filtered through the graded filter plate 13, the scraper 14 scrapes off the dirt on the surface of the graded filter plate 13 to prevent clogging. A storage tank 15 is located on the left side of the circulation tank 6. The connection between the storage tank 15 and the circulation tank 6 is located above one side of the graded filter plate 13. A return pipe 16 is connected to the bottom of the storage tank 15. One end of the return pipe 16 is connected to the inner cavity of the cleaning tank 1. A filter screen is installed at the end of the return pipe 16 located inside the storage tank 15. The connection between the return pipe 16 and the storage tank 15 is located above the cleaning tank 1. Dirt is scraped into the storage tank 15 by the scraper 14 for storage. Water is filtered through the filter screen and then returned to the storage tank 15. The water is transported to the cleaning tank 1 through the flow pipe 16. A switch valve is installed on one side of the storage tank 15 to periodically open and discharge accumulated dirt for cleaning. An expansion air bladder 9 and a guide rod 8 are fixedly connected to the inner cavity of the drainage channel 7. The guide rod 8 guides the expansion air bladder 9, ensuring it can only contract and expand in the direction of the guide rod 8. An electric actuator 10 is installed on one side of the drainage channel 7 to drive the expansion air bladder 9, causing it to expand and contract within the drainage channel 7 to regulate the water flow. When dirt accumulates on the surface of the graded filter plate 13, the expansion air bladder 9 contracts, increasing the drainage area of ​​the drainage channel 7, increasing water pressure, increasing the impact force on the turbulence impeller 11, and increasing the thrust on the scraper 14, resulting in better cleaning.The circulation tank 6 and the feed tank 2 are connected by a pumped circulation pipe 17. A pneumatic ball valve 18 is installed inside the circulation pipe 17. The inner cavity of the expansion bladder 9 is connected to the pneumatic chamber of the pneumatic ball valve 18 via an air supply pipe 19. When the expansion bladder 9 contracts, the drainage area of ​​the drainage channel 7 increases, and the gas inside the expansion bladder 9 is delivered to the pneumatic ball valve 18, pushing the opening of the pneumatic ball valve 18 to increase. The circulation pipe 17 is also connected to an external water source, increasing the water inflow and spraying force. The water flow into the drainage channel 7 also increases, making cleaning of the graded filter plate 13 easier. After cleaning, the expansion bladder 9 expands, and the opening of the pneumatic ball valve 18 decreases, reducing water pressure to continue spraying and cleaning. The inner cavity of the cleaning tank 1 is equipped with a discharge conveyor belt 20. A plastic frame 21 is provided on the surface of the conveyor belt 20. The plastic is lifted from the washing tank 1 through the plastic frame 21 for further processing. A drain tank 22 is provided on one side of the washing tank 1. The right end of the discharge conveyor belt 20 is located above the drain tank 22. A centrifuge cylinder 24 driven by a motor is rotatably connected to the inner cavity of the drain tank 22. A collar 25 is fixedly connected to the inner cavity of the drain tank 22 and fitted onto the surface of the centrifuge cylinder 24. A discharge channel 26 is connected to one side of the collar 25. Plastic particles fall into the centrifuge cylinder 24. The centrifuge cylinder 24 rotates to discharge water, and then the solenoid valve in the discharge channel 26 is opened. When the centrifuge cylinder 24 rotates, the plastic particles inside are discharged from the holes in the collar 25 through the discharge channel 26. A guide frame 23 is provided inside the drain tank 22 for guiding.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for producing low-temperature resistant plastic granules for pipes, characterized in that: Includes the following steps: Step 1: Clean the waste material. After cleaning, add the raw material to a high-speed mixer to obtain a premix. Step 2: Add the premixed material to the twin-screw extruder and heat it to a molten state for plasticization; Step 3: Extrude the melt into strip-shaped structures using an extruder and allow it to cool and harden. Step 4: Perform cold pressing and hot pressing processes; Step 6: Granulate the pellets using a pelletizer and then sieve them to obtain the finished product; In step one, the waste material is first pre-cleaned using pre-treatment equipment, then finely cleaned, and finally discharged after centrifugation to remove water. In step one, the wastewater generated during waste cleaning is circulated through the circulation tank (6) of the pretreatment equipment; During the pre-cleaning process in step one, plastic granules are fed into the feed box (2). The pull rope (5) is pulled by the take-up reel (4) to move the movable filter plate (3). After the plastic granules are cleaned, the movable filter plate (3) is lowered to discharge more plastic. At this time, the spray plate set at the top of the inner cavity of the feed box (2) sprays water to pre-wash the plastic. The cleaned plastic granules enter the cleaning box (1) from the discharge port on one side of the feed box (2). During the detailed cleaning in step one, cleaning is performed using the cleaning components inside the cleaning tank (1); In step one, during centrifugal dewatering, the plastic is lifted out of the washing tank (1) by setting the plastic frame (21), and the plastic particles fall into the centrifuge drum (24). The centrifuge drum rotates to discharge the water. Then, the solenoid valve in the discharge channel (26) is opened. When the centrifuge drum (24) rotates, the plastic particles inside are discharged from the hole of the collar (25) through the discharge channel (26) for discharge. During the circulation process in step one, the sewage is transported to the circulation tank (6) through the drainage channel (7), which drives the turbulence impeller (11) to rotate. While the sewage is filtered through the graded filter plate (13), the dirt on the surface of the graded filter plate (13) is scraped off by the scraper (14) to prevent the graded filter plate (13) from clogging. The dirt is scraped into the storage tank (15) by the scraper (14) for storage. After the water is filtered by the filter screen, it is transported to the cleaning tank (1) through the return pipe (16). A switch valve is provided on one side of the storage tank (15) to open and discharge the dirt accumulated inside for cleaning at regular intervals. During the cyclic processing in step one, the expansion airbag (9) is guided by the guide rod (8) so that it can only contract and expand in the direction of the guide rod (8). An electric push rod (10) for driving the expansion airbag (9) is provided on one side of the drainage channel (7). The expansion airbag (9) is pushed to expand and contract in the drainage channel (7) to regulate the water flow. When dirt accumulates on the surface of the graded filter plate (13), the expansion airbag (9) is driven to contract, increasing the drainage area of ​​the drainage channel (7), increasing the water pressure, increasing the impact force on the turbulence impeller (11), and increasing the thrust on the scraper (14).

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