A plastic pipe production process for recycling waste plastics

Abstract

The present application relates to the field of producing plastic pipes by using waste plastics, and specifically discloses a plastic pipe production process for recycling waste plastics, which includes cleaning the waste plastics; crushing the waste plastics after cleaning the stains into particles; re-cleaning the granular waste plastics and air-drying them; placing the air-dried granular waste plastics into a furnace for melting to obtain molten plastics; removing metal parts from the molten plastics to obtain high-purity molten plastics; discharging the high-purity molten plastics from the furnace and extruding them through an extruder and cooling them through a pipe forming machine to obtain plastic pipes. The present application has the effect of removing metal from the molten plastics when the metal is not melted after the plastics are melted, thereby better ensuring the purity of the plastics.

Description

Technical Field

[0001] The present application relates to the field of producing plastic pipes by utilizing waste plastics, and in particular to a plastic pipe production process by recycling waste plastics. Background Art

[0002] At present, the production process of plastic pipes requires a series of steps of melting, extruding and cooling to form granular plastics as raw materials. A part of the granular plastics is obtained by recycling and reusing waste plastics. During the recycling and reusing of waste plastics, impurities in the waste plastics need to be removed to ensure the purity of the plastics.

[0003] In the related art, the Chinese patent with application number CN202211587390.8 proposes a technology for separating some impurities mixed in plastic particles from plastic particles, mainly by filtering to remove impurities of a specific volume size;

[0004] With respect to the above-mentioned related technologies, the inventor believes that there are the following defects:

[0005] In some cases, waste plastics may come from toys, household appliances or remote controls that contain screws, or from plastic products that contain very small metal parts. Some screws are very small. After the above-mentioned plastic products are crushed into granular plastics, screws or metal parts may exist in the granular plastics. In this case, it is difficult to accurately remove the granular plastics containing screws or metal parts by screening impurities by a specific volume, resulting in impurities in the plastic that are difficult to remove, affecting the production quality of the pipeline. Summary of the invention

[0006] In order to improve the problem of difficulty in removing extremely small screws or metal parts from plastics, the present application provides a plastic pipe production process for recycling waste plastics.

[0007] The present application provides a plastic pipe production process for recycling waste plastics using the following technical solutions:

[0008] A plastic pipe production process for recycling waste plastics comprises: cleaning the waste plastics from stains; crushing the cleaned waste plastics into particles; re-cleaning the granular waste plastics and air-drying them; placing the air-dried granular waste plastics into a furnace for melting to obtain molten plastics; removing metal parts from the molten plastics to obtain high-purity molten plastics; discharging the high-purity molten plastics from the furnace and extruding them into shape through an extruder and cooling them into shape through a pipe forming machine to obtain plastic pipes.

[0009] By adopting the above technical solution, the waste plastics are first cleaned to reduce the impurity content in the waste plastics. Then, when the waste plastics are recycled, the purity of the plastics can be greatly improved, thereby greatly improving the purity and quality of the final produced pipes. After the waste plastics are crushed, the waste plastics are cleaned again. Then, the effect of cleaning the waste plastics will be greatly improved, thereby further ensuring the purity of the reused waste plastics. Removing metal parts from the molten waste plastics can better utilize the difference in melting points between plastics and metals to separate plastics from metal parts, thereby removing metal parts, further improving the purity of the plastics, and thus greatly improving the plastic purity and quality of the water pipe body.

[0010] Optionally, removing metal parts from the molten plastic includes: using a stirring component to stir the molten plastic so that the molten plastic is in a high-speed motion state; placing a filter component that can form a accommodating chamber into a furnace, and after a period of time, after the filter component accommodates the metal parts, taking the filter component out and removing the metal parts from the filter component; repeating the above steps to remove all metal parts from the molten plastic; wherein the molten plastic can pass through the filter component, but the metal parts cannot pass through the filter component.

[0011] By adopting the above technical solution, the stirring component stirs the molten plastic, and the molten plastic is always in motion, making it difficult for the molten plastic to solidify. Then, when the filter component is placed in the molten plastic, since the molten plastic is not easy to solidify, it has better fluidity, so that the molten plastic can be better moved to the containing chamber, and the molten plastic can better penetrate the containing chamber and leave the metal parts in the containing chamber, thereby achieving a higher removal efficiency of the metal parts.

[0012] Optionally, an inlet is formed in the filter component for allowing molten plastic and metal parts to enter the accommodating chamber; when the filter component is placed inside the molten plastic, the opening direction of the inlet coincides with the movement direction of the molten plastic.

[0013] By adopting the above technical solution, the inlet is aligned with the movement direction of the molten plastic, which makes it easier for the molten plastic to directly enter the containing chamber, and the molten plastic still has greater kinetic energy after entering the containing chamber, so that the molten plastic can quickly pass through the containing chamber, thereby achieving the rapid penetration of the molten plastic through the containing chamber, avoiding blockage in the containing chamber, and better ensuring the removal of metal parts.

[0014] Optionally, taking the filter component outward and removing the metal parts in the filter component include: blocking the entrance by a baffle that can move relative to the filter component; moving the filter component by a driving component until the filter component leaves the molten plastic; after the filter component leaves the molten plastic, the filter component is eccentrically rotated relative to the center of the filter component by the driving component to throw the molten plastic in the accommodating chamber outward; a collection box that can collect metal parts is moved to the bottom of the filter component by the driving component, and the baffle is opened by the driving component to allow the metal parts to be discharged into the collection box.

[0015] By adopting the above technical scheme, the entrance can be opened and blocked under the action of the blocking member. Then, after the metal parts collected in the accommodating chamber reach a certain value, the entrance is blocked, so that the metal parts are sealed in the accommodating chamber. Subsequently, the eccentric rotation of the filter component relative to the center of the filter component can make the metal parts in the accommodating chamber continuously hit the inner wall surface of the accommodating chamber due to the action of inertia. Since the viscosity of the molten plastic is relatively high, when the filter component moves to the outside of the molten plastic, part of the molten plastic will adhere to the filter component and the metal parts in the filter component. Then, when the filter component rotates eccentrically, the molten plastic adhered to the filter component will be thrown outward, and the metal parts move in the accommodating chamber and hit the inner wall surface of the accommodating chamber, which will separate the molten plastic adhered to the metal parts from the metal parts and throw them outward, thereby greatly reducing the loss of molten plastic when taking out the metal parts from the molten plastic, and better removing the metal parts.

[0016] Optionally, the filter component includes a first filter shell and a second filter shell; wherein a plurality of filter holes are formed on the first filter shell and the second filter shell; the first filter shell and the second filter shell overlap with each other, and the filter holes of the first filter shell partially overlap with the filter holes of the second filter shell, so that a plurality of through holes are formed in the accommodating chamber through which molten plastic can pass but metal parts cannot pass.

[0017] Optionally, placing the filter component capable of forming a accommodating chamber into the furnace includes: moving the first filter shell and the second filter shell relative to each other through the driving member so that the filter holes of the first filter shell partially overlap with the filter holes of the second filter shell, thereby changing the size of the through hole; when the filter holes of the first filter shell partially overlap with the filter holes of the second filter shell, the metal part cannot pass through the through hole; when the filter holes of the first filter shell completely overlap with the filter holes of the second filter shell, the metal part can pass through the through hole.

[0018] By adopting the above technical scheme, the first filter shell and the second filter shell can move relative to each other, so that the size of the through hole can be controlled. In some cases, the size of the through hole can be adjusted according to the size of the metal part in the molten plastic, which greatly improves the versatility during use; in some cases, the size of the through hole is ensured to be large, so that the molten plastic can quickly pass through the through hole, and more volume of molten plastic can quickly pass through the through hole, so that the metal parts can be quickly recovered; when the size of the metal part is small, making the size of the through hole smaller will cause the collection speed of the metal parts to decrease, but when there are both large-sized and small-sized metal parts in the molten plastic, the large-sized metal parts can be collected first, and then the small-sized metal parts can be collected to increase the collection and removal speed of the metal parts.

[0019] Optional methods for cleaning stains on waste plastics include: using a water source mixed with a detergent to rinse the waste plastics with water and to wash them with agitated water.

[0020] Optionally, the temperature of the water source mixed with the detergent is 80-90°C.

[0021] Optionally, a discharge plate is provided in the accommodating chamber, and the discharge plate and the bottom surface of the accommodating chamber form an inclined surface extending obliquely downward, so that the metal parts on the discharge plate are discharged outward from the inlet due to their own gravity.

[0022] By adopting the above technical solution, the inclined surface extending obliquely downward improves the efficiency of discharging the metal parts out of the accommodating chamber.

[0023] Optionally, the process of opening the baffle by the driving member to discharge the metal parts into the collection box includes: the driving member drives the baffle to move so that the entrance is opened; the driving member also drives the discharge plate to move so that the end of the discharge plate away from the entrance moves upward, so that the metal parts on the discharge plate are discharged outward.

[0024] By adopting the above technical solution, when the entrance is opened, the unloading plate moves so that one end of the unloading plate moves upward, thereby forming an inclined surface extending downwardly. Then, when the filter component is placed in the molten plastic, it can effectively ensure that the metal parts enter the accommodating chamber, and the unloading plate is controlled so that the inclined surface is not formed, and the metal parts will not leave the accommodating chamber. When the metal parts need to be discharged outward, the unloading plate forms an inclined surface and discharges the metal parts, thereby better ensuring the efficiency of collecting and removing the metal parts.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. Melt the plastic, and use the principle that the melting point of plastic is different from that of metal. When the metal is not melted after the plastic is melted, remove the metal from the molten plastic to better ensure the purity of the plastic;

[0027] 2. Multi-step cleaning of waste plastics improves the effect of removing plastic stains, thereby ensuring the purity of plastics;

[0028] 3. Place the filter component into the molten plastic, and make the molten plastic pass through the filter component, while the metal parts cannot pass through the filter component, so that the metal parts are retained in the molten plastic and the metal parts are removed;

[0029] 4. The molten plastic is put into motion by the stirring component, so that the molten plastic at different positions can pass through the filtering component, thereby realizing the removal of metal parts in all the molten plastics;

[0030] 5. The filter component is separated from the molten plastic by a driving member, and after the filter component is separated from the molten plastic, the filter component is rotated eccentrically, so that the plastic adhering to the filter component is thrown outward, thereby avoiding the waste of plastic in the process of removing metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic block diagram of the overall process flow of the embodiment of the present application;

[0032] Figure 2 It is a structural schematic diagram of a part of the embodiment, mainly showing a flow chart of equipment for processing waste plastics;

[0033] Figure 3 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure of the melting furnace and the fixing bracket;

[0034] Figure 4 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure of the stirring rod and some surrounding parts;

[0035] Figure 5 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure of the filter component and the driving component;

[0036] Figure 6 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure inside the protective cover;

[0037] Figure 7 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure of the third hydraulic cylinder, the third drive motor and some surrounding parts;

[0038] Figure 8 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure of another implementation scheme of the driving member;

[0039] Fig. 9 It is a structural diagram of a part of the embodiment, mainly showing Figure 5 The cross-sectional structure of

[0040] Fig.10 yes Fig. 9 Enlarged view of part A in the middle;

[0041] Fig.11 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure when the filter holes of the first filter housing and the filter holes of the second filter housing do not overlap at all;

[0042] Fig.12 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure when the filter holes of the first filter housing and the filter holes of the second filter housing partially overlap;

[0043] Fig.13 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure of the first filter housing, the second filter housing and the backing plate;

[0044] Fig.14 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure of the stopper, the connecting rod, the unloading plate and some surrounding parts;

[0045] Fig.15 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure when the blocking member moves upward to open the inlet and one end of the discharge plate moves upward;

[0046] Fig.16 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure of a scheme in which the filter component is a filter net.

[0047] 1. The invention relates to a first transmission element, wherein the first transmission element is a cylinder, and the second transmission element is a cylinder. The cylinder has two ends, and the ends are connected to each other with a check valve. The cylinder has two ends, and the ends are connected with a check valve. The cylinder has two ends, and the ends are connected with a check valve. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1-16This application is described in further detail.

[0049] The embodiment of the present application discloses a plastic pipe production process for recycling waste plastics.

[0050] Reference Figure 1-2 , a plastic pipe production process for recycling waste plastics, comprising:

[0051] Clean stains from waste plastics;

[0052] Crushing the waste plastics after cleaning into particles;

[0053] Re-cleaning and air-drying the granular waste plastics;

[0054] The air-dried granular waste plastic is placed in a melting furnace 1 to be melted, and a molten plastic is obtained;

[0055] The metal parts in the molten plastic are removed to obtain high-purity molten plastic;

[0056] The high-purity molten plastic is discharged from the melting furnace 1 and is extruded and formed by an extruder and cooled and formed by a pipe forming machine to obtain a plastic pipe.

[0057] Optional methods of cleaning the waste plastic stains include: using a water source mixed with a detergent to rinse the waste plastic with water and to stir the water. The detergent is a plastic detergent.

[0058] Optionally, the temperature of the water source mixed with the detergent is 80-90°C.

[0059] Reference Figure 1-2 In this embodiment, the waste plastic is cleaned of stains by the first cleaning device, the waste plastic is crushed into particles by the crushing device, the granular waste plastic is cleaned again by the second cleaning device, and the granular waste plastic is air-dried by the industrial fan. Among them, the first cleaning device and the second cleaning device both adopt the existing technology of immersion cleaning. The crushing device is a crusher. The waste plastic cleaned by the first cleaning device is moved to the crushing device through a conveyor, the granular plastic crushed by the crushing device is moved to the second cleaning device through another conveyor, and the granular plastic cleaned by the second cleaning device is moved to the melting furnace 1 through a third conveyor for melting. Both the first cleaning device and the second cleaning device can use a washing machine to achieve stirring and water washing of the waste plastic.

[0060] In this embodiment, the method for removing metal parts from molten plastic is to use filtering to make the molten plastic flow in one direction, and then set a filter net 31, which will block the metal parts and allow the molten plastic to pass through, thereby realizing the process of removing metal parts and molten plastic.

[0061] In this embodiment, the molten plastic is extruded into a tube through an extruder, and the extruded water pipe body is then adhered to a traction tube. The traction tube then pulls the extruded water pipe body outward and is cooled and formed by a water-cooling device.

[0062] By adopting the above technical solution, the waste plastics are first cleaned to reduce the impurity content in the waste plastics. Then, when the waste plastics are recycled, the purity of the plastics can be greatly improved, thereby greatly improving the purity and quality of the final produced pipes. After the waste plastics are crushed, the waste plastics are cleaned again. Then, the effect of cleaning the waste plastics will be greatly improved at this time, thereby further ensuring the purity of the reused waste plastics. Removing metal parts from the molten waste plastics can better utilize the difference in melting points between plastics and metals to separate the plastics from the metal parts, thereby removing the metal parts, further improving the purity of the plastics, and thus greatly improving the plastic purity and quality of the water pipe body. In some cases, there are multiple screws on the plastic, and the screws are difficult to separate directly from the plastic. Then, after the plastic is molten, the screws are easy to separate from the plastic.

[0063] Reference Figure 1-4 In some embodiments, removing metal parts from molten plastic includes: stirring the molten plastic using a stirring component 2 to make the molten plastic move at a high speed; placing a filter component 3 that can form a receiving chamber 32 into the furnace 1, and after a period of time, after the filter component 3 receives the metal parts, taking the filter component 3 out and removing the metal parts from the filter component 3; repeating the above steps to remove all metal parts from the molten plastic; wherein the molten plastic can pass through the filter component 3, but the metal parts cannot pass through the filter component 3.

[0064] In this embodiment, a fixed bracket 4 is provided outside the melting furnace 1, and the stirring component 2 includes a first drive motor 21, a first rotating shaft 22, and a plurality of stirring rods 23 mounted on the first rotating shaft 22. The output end of the first drive motor 21 is connected to the first rotating shaft 22, so that the first drive motor 21 can drive the first rotating shaft 22 to rotate, and the first drive motor 21 is mounted on the fixed bracket 4. Among them, a melting chamber is formed in the melting furnace 1, the first rotating shaft 22 is located in the middle of the melting chamber, the stirring rod 23 is located in the middle of the melting chamber, and there is no stirring component 2 at the edge of the melting chamber, so that the stirring component 2 stirs in the middle of the melting chamber, and the molten plastic at the edge of the melting chamber will also move.

[0065] The filter component 3 in this embodiment is a filter screen 31. The filter screen 31 is a flexible structure or a rigid structure. When the filter screen 31 is a flexible structure, the filter screen 31 can be deformed by external interference to form a receiving chamber 32. For example, the method of deformation by external interference is to use a rectangular frame, so that the edge of the filter screen 31 and the rectangular frame are partially fixed in position, then the filter screen 31 is deformed in the shape of the rectangular frame, so that the receiving chamber 32 can be formed. When the filter screen 31 is a rigid structure, the filter screen 31 is constructed as a rigid plate body with a receiving chamber 32, and a hole is opened on the plate body, so that the molten plastic can pass through the filter component 3, and the metal parts cannot pass through the filter component 3.

[0066] By adopting the above technical solution, the stirring component 2 stirs the molten plastic, and the molten plastic is always in motion, making it difficult for the molten plastic to solidify. Then, when the filter component 3 is placed in the molten plastic, since the molten plastic is not easy to solidify, it has better fluidity, so that the molten plastic can be better moved to the accommodating chamber 32, and the molten plastic can better penetrate the accommodating chamber 32 and leave the metal parts in the accommodating chamber 32, thereby achieving a higher removal efficiency for the metal parts.

[0067] Reference Figure 3-4In other embodiments, the filter component 3 is formed with an inlet 33 for allowing molten plastic and metal parts to enter the receiving chamber 32; when the filter component 3 is placed inside the molten plastic, the opening direction of the inlet 33 coincides with the moving direction of the molten plastic. The inlet 33 coincides with the moving direction of the molten plastic, which makes it easier for the molten plastic to directly enter the receiving chamber 32, and the molten plastic still has greater kinetic energy after entering the receiving chamber 32, so that the molten plastic can quickly pass through the receiving chamber 32, thereby achieving the rapid penetration of the molten plastic through the receiving chamber 32, avoiding the blockage in the receiving chamber 32 due to the greater viscosity of the molten plastic, thereby better ensuring the removal of metal parts.

[0068] Taking out the filter component 3 and removing the metal parts in the filter component 3 includes:

[0069] The inlet 33 is blocked by a blocking member 5 that is movable relative to the filter element 3; the blocking member 5 is a filter plate.

[0070] The filter element 3 is moved by a driving member until the filter element 3 leaves the molten plastic;

[0071] After the filter component 3 leaves the molten plastic, the filter component 3 is rotated eccentrically relative to the center of the filter component 3 by the driving member, so that the molten plastic in the accommodating chamber 32 is thrown outwards;

[0072] The driving member moves a collection box capable of collecting metal parts to the bottom of the filter component 3, and the driving member opens the blocking member 5 to discharge the metal parts into the collection box. The collection box is fixed to the fixing bracket 4 by a manipulator. The manipulator is used to drive the collection box to move.

[0073] Reference Fig.16 In this embodiment, a specific solution for the filter component 3 is that the filter component 3 is a flexible filter screen 31, and the driving member is a structure having multiple movable driving points, and the multiple driving points are distributed on the edge of the filter component 3, so that the multiple driving points can move so that the filter screen 31 has a receiving chamber 32 and an entrance 33, and the multiple driving points can also move so that the entrance 33 of the filter screen 31 is closed. Among them, the blocking member 5 is the edge of the filter screen 31, and the edge of the filter screen 31 is a hard thickened material, and the hard thickened material is convenient for closing the opening. The multiple driving points are formed by the output ends of the multiple electric push rods 6.

[0074] Reference Figure 5-6Another preferred specific solution for the filter component 3 is that the filter component 3 is a box body having a accommodating chamber 32 and an entrance 33 formed by piecing together a plurality of rigid filter plates, the blocker 5 is a rigid filter plate, and the driving member includes two electric push rods 6, one of the electric push rods 6 drives the filter component 3 to move up and down, and the other electric push rod 6 drives the blocker 5 to move up and down, and the blocker 5 moves relative to the filter component 3 so that the blocker 5 blocks and opens the entrance 33.

[0075] Reference Figure 8 A specific example of a driving member is that the driving member includes a first hydraulic cylinder 7, a second driving motor 71, a first connecting frame 72, a second connecting frame 73 and a plurality of electric push rods 6. The first hydraulic cylinder 7 is mounted on a fixed bracket 4, the second connecting frame 73 is connected to the output end of the first hydraulic cylinder 7, the rotating motor is mounted on the second connecting frame 73, the first connecting frame 72 is connected to the output end of the rotating motor, and the plurality of electric push rods 6 are all fixedly mounted on the first connecting frame 72; when the filter component 3 is a box body having a accommodating chamber 32 and an inlet 33 formed by piecing together a plurality of rigid filter plates, the filter component 3 is fixed to the first connecting frame 72, and the electric push rod 6 is connected to the blocking member 5; when the filter component 3 is a flexible filter net 31, the plurality of electric push rods 6 are all connected to the edge of the filter net 31. Refer to Figure 5 A protective cover is arranged on the third connecting plate, and the protective cover is used to cover part of the driving parts for protection.

[0076] Reference Figure 5-79-10, in this embodiment, as a preferred solution, the filter component 3 is a box body with a accommodating chamber 32 and an inlet 33 formed by piecing together a plurality of rigid filter plates. The driving member includes: a second hydraulic cylinder 8, a third connecting frame 81, a third driving motor 82, a first gear 83, a second gear 84, a telescopic transmission tube 85, a third hydraulic cylinder 86, a first connecting block 87, a second connecting block 88 and a connecting rod 89. Among them, the second hydraulic cylinder 8 is fixedly mounted on the third connecting frame 81, the third connecting frame 81 is connected to the fixed bracket 4, the third drive motor 82 is mounted on the third connecting frame 81, the first gear 83 is connected to the output end of the third drive motor 82, the second gear 84 is meshed with the first gear 83, the second gear 84 is fixed to the telescopic transmission tube 85, and the telescopic transmission tube 85 is fixed to the filter component 3; the third hydraulic cylinder 86 is fixedly mounted on the third connecting frame 81, the first connecting block 87 is connected to the output end of the third hydraulic cylinder 86, the second connecting block 88 is fixed to the connecting rod 89, the first connecting block 87 is rotatably connected to the second connecting block 88, one end of the connecting rod 89 is fixed to the second connecting block 88, and the other end is fixed to the stopper 5; the output end of the third hydraulic cylinder 86 is located in the middle of the telescopic transmission tube 85, the third drive motor 82 drives the telescopic transmission tube 85 to rotate through the first gear 83 and the second gear 84, and the output end of the second hydraulic cylinder 8 is rotatably connected to the end of the telescopic transmission tube 85 through the connecting plate.

[0077] Specifically, the first connection block 87 and the second connection block 88 match the rotary joint structure, so that the first connection block 87 and the second connection block 88 can rotate relative to each other and cannot be separated when subjected to axial tension. As a further preferred embodiment, the first connection block 87 includes a first connection shell and a second connection shell, the first connection shell and the second connection shell are butted together to form the first connection block 87, the end of the second connection block 88 forms a clamping block 871, and a clamping groove is formed in both the first connection shell and the second connection shell. After the clamping block 871 is embedded in the clamping groove in the first connection shell, the second connection shell is butted against the first connection shell, so that the first connection block 87 and the second connection block 88 can rotate relative to each other and cannot be separated when subjected to axial tension.

[0078] In other embodiments, the third hydraulic cylinder 86 is a multi-section telescopic tube 861 and a hydraulic pump 862. One end of the multi-section telescopic tube 861 is fixed to the third connecting frame 81, and the other end is connected to the first connecting block 87. The hydraulic pump 862 applies pressure to the multi-section telescopic tube 861 to extend and shorten the multi-section telescopic rod to drive the first connecting block 87 to move.

[0079] More specifically, the blocking member 5 is slidably connected to the filter component 3 through the cooperation of the sliding groove and the sliding block.

[0080] The working process of this embodiment in actual use is as follows: the second hydraulic cylinder 8 drives the end of the telescopic transmission tube 85 to move downward, the telescopic transmission tube 85 extends to drive the filter component 3 to move into the molten plastic, and the third hydraulic cylinder 86 drives the block 5 to move upward through the first connecting block 87, the second connecting block 88 and the connecting rod 89, so that the block 5 opens the inlet 33. After a period of time, the third hydraulic cylinder 86 moves the block 5 upward to block the inlet 33; the inlet 33 can be opened and blocked under the action of the block 5, so that when the metal pieces collected in the accommodating chamber 32 reach a certain value, the inlet 33 is blocked, and the metal pieces are sealed in the accommodating chamber 32; the second hydraulic cylinder 8 drives the end of the telescopic transmission tube 85 to move upward, thereby driving the filter component 3 to move upward, and the filter component 3 moves to the top of the molten plastic, and the third drive motor 82 drives the telescopic transmission tube 85 to rotate through the first gear 83 and the second gear 84, and the telescopic transmission tube 85 drives the filter component 3 to rotate eccentrically. Since the viscosity of the molten plastic is relatively high, the filter component When the filter element 3 moves to the outside of the molten plastic, some molten plastic will adhere to the filter element 3 and the metal parts in the filter element 3. Then, when the filter element 3 rotates eccentrically, the molten plastic adhered to the filter element 3 will be thrown outward. The metal parts move in the accommodating chamber 32 and hit the inner wall surface of the accommodating chamber 32, which will separate the molten plastic adhered to the metal parts from the metal parts and throw them outward, thereby greatly reducing the loss of molten plastic when taking out the metal parts from the molten plastic. The stopper 5, the connecting rod 89 and the second connecting block 88 rotate together with the filter element 3, and the first connecting block 87 and the second connecting block 88 rotate relative to avoid interference.

[0081] Reference Figure 11-13 Based on the above embodiment, another preferred specific solution of the filter component 3 is as follows:

[0082] The filter component 3 includes a first filter housing 34 and a second filter housing 35. A plurality of filter holes 36 are formed on each of the first filter housing 34 and the second filter housing 35. The first filter housing 34 and the second filter housing 35 overlap each other, and the filter holes 36 of the first filter housing 34 partially overlap with the filter holes 36 of the second filter housing 35, so that a plurality of through holes are formed in the accommodating chamber 32 through which molten plastic can pass and metal parts cannot pass.

[0083] Specifically, the first filter housing 34 and the second filter housing 35 are both rectangular boxes with one end open. The first filter housing 34 is located inside the second filter housing 35, and the first filter housing 34 is slidably connected to the second filter housing 35. The distance between the upper end surface of the second filter housing 35 and the lower end surface of the second filter housing 35 is greater than the distance between the upper end surface of the first filter housing 34 and the lower end surface of the second filter housing 35. When the upper end surface of the first filter housing 34 abuts against the upper end surface of the second filter housing 35, the through hole formed by the filter hole 36 of the first filter housing 34 and the filter hole 36 of the second filter housing 35 does not exist, that is, the filter hole 36 of the first filter housing 34 and the filter hole 36 of the second filter housing 35 do not overlap at all; when the first filter housing 34 moves downward relative to the second filter housing 35 until the lower end surface of the first filter housing 34 abuts against the lower end surface of the second filter housing 35, the through hole formed by the filter hole 36 of the first filter housing 34 and the filter hole 36 of the second filter housing 35 does not exist, that is, the filter hole 36 of the first filter housing 34 and the filter hole 36 of the second filter housing 35 do not overlap at all. In the process of the first filter housing 34 moving downward relative to the second filter housing 35, the size of the through hole gradually increases and then gradually decreases.

[0084] More specifically, a pad 37 is provided on the first filter housing 34, and the pad 37 is used to change the size of the through hole when the upper end surface of the first filter housing 34 abuts against the upper end surface of the second filter housing 35. In some other solutions, the pad 37 can also be replaced by a high temperature resistant electric push rod 6.

[0085] Placing the filter element 3 capable of forming the receiving chamber 32 into the furnace 1 comprises:

[0086] The first filter housing 34 and the second filter housing 35 are moved relative to each other by the driving member, so that the filter holes 36 of the first filter housing 34 partially overlap with the filter holes 36 of the second filter housing 35, thereby changing the size of the through holes;

[0087] Specifically, the second hydraulic cylinder 8 drives the first filter housing 34 to move, thereby realizing the movement of the first filter housing 34 relative to the second filter housing 35, and when the first filter housing 34 moves to the point where the upper end surface of the first filter housing 34 abuts against the upper end surface of the second filter housing 35, the first filter housing 34 drives the second filter housing 35 to move together to move the filter component 3 upward.

[0088] When the filter holes 36 of the first filter housing 34 partially overlap with the filter holes 36 of the second filter housing 35, the metal parts cannot pass through the through holes; when the filter holes 36 of the first filter housing 34 completely overlap with the filter holes 36 of the second filter housing 35, the metal parts can pass through the through holes.

[0089] By adopting the above technical solution, the first filter housing 34 and the second filter housing 35 can move relative to each other, so that the size of the through hole can be controlled. In some cases, the size of the through hole can be adjusted according to the size of the metal parts in the molten plastic, which greatly improves the versatility during use; in some cases, the size of the through hole is ensured to be large, so that the molten plastic can quickly pass through the through hole, and a larger volume of molten plastic can quickly pass through the through hole, so that the metal parts can be quickly recovered; and when the size of the metal parts is small, making the size of the through hole smaller will cause the collection speed of the metal parts to decrease, but when there are both large-sized and small-sized metal parts in the molten plastic, the large-sized metal parts can be collected first, and then the small-sized metal parts can be collected to increase the collection and removal speed of the metal parts.

[0090] Reference Figure 11-15 In some other preferred embodiments, a discharge plate 9 is provided in the accommodating chamber 32, and the discharge plate 9 and the bottom surface of the accommodating chamber 32 form an inclined surface extending downwardly, so that the metal parts on the discharge plate 9 are discharged outward from the inlet 33 under their own gravity.

[0091] The step of opening the blocking member 5 by the driving member to discharge the metal parts into the collection box comprises:

[0092] The driving member drives the blocking member 5 to move, so that the entrance 33 is opened; the driving member also drives the unloading plate 9 to move, so that the end of the unloading plate 9 away from the entrance 33 moves upward, so that the metal parts on the unloading plate 9 are discharged outward.

[0093] The driving member further comprises a hinge rod 91, one end of which is hinged to the second connection block 88 and the other end is hinged to the discharge plate 9, so that when the first connection block 87 moves upward, the second connection block 88 moves upward and drives the blocking member 5 to open through the connection rod 89, and drives one end of the discharge plate 9 to move upward through the hinge rod 91. When the inlet 33 is opened, the discharge plate 9 moves, so that one end of the discharge plate 9 moves upward, thereby forming an inclined surface extending downward, so that when the filter component 3 is placed in the molten plastic, it can effectively ensure that the metal parts enter the accommodating chamber 32, and the discharge plate 9 is controlled so that the inclined surface is not formed, and the metal parts will not leave the accommodating chamber 32. When the metal parts need to be discharged outward, the discharge plate 9 forms an inclined surface and discharges the metal parts, so as to better ensure the efficiency of collecting and removing the metal parts.

[0094] Among them, a first rotation groove is opened on one end of the telescopic transmission tube 85 connected to the third connecting frame 81, and the first rotation groove is clamped on the third connecting frame 81. A second rotation groove is opened on the end of the telescopic transmission tube 85 connected to the connecting plate, and the second rotation groove is clamped on the connecting plate.

[0095] The preferred implementation principle of a plastic pipe production process for recycling waste plastics in the embodiment of the present application is:

[0096] Washing large volumes of waste plastics, crushing large plastic particles into granules after washing, and then washing the granular plastics again, drying them after washing and adding them to the melting furnace 1;

[0097] The second hydraulic cylinder 8 drives the end of the telescopic transmission tube 85 to move downward, so that the end of the telescopic transmission tube 85 drives the first filter housing 34 to move downward, and the second filter housing 35 moves downward together with the first filter housing 34. After the lower part of the second filter housing 35 contacts the bottom surface of the melting chamber, the second filter housing 35 stops moving downward, and the first filter housing 34 continues to move downward until the filter hole 36 on the first filter housing 34 overlaps with the filter hole 36 on the second filter housing 35 to form a through hole size that meets the requirements, and then the second hydraulic cylinder 8 stops the first filter housing 34 from moving downward; the hydraulic pump 862 drives the stopper 5 to move upward to open the inlet 33 by controlling the liquid hydraulic pressure in the multi-section telescopic tube 861, and the stirring component 2 stirs the middle part of the melting chamber, so that the molten plastic in the melting chamber is in a moving state, and the molten plastic and the metal parts are moved to the inside of the first filter housing 34, the molten plastic passes through the through hole, and the metal parts cannot pass through the through hole and remain in the first filter housing 34, thereby achieving the separation of the metal parts and the plastic;

[0098] The hydraulic pump 862 and the multi-section telescopic tube 861 move the blocking member 5 downward to block the inlet 33, and the second hydraulic cylinder 8 drives the end of the telescopic transmission tube 85 upward to move the first filter housing 34 upward, and the upper end surface of the first filter housing 34 abuts against the upper end surface of the second filter housing 35, thereby driving the second filter housing 35 to move upward at the same time. When the filter component 3 is completely separated from the molten plastic, it stops moving;

[0099] The third driving motor 82 drives the telescopic transmission tube 85 to rotate through the first gear 83 and the second gear 84 , thereby driving the first filter housing 34 and the second filter housing 35 to rotate eccentrically.

[0100] 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 plastic pipe production process for recycling waste plastics, characterized by: include: Clean stains from waste plastics; Crushing the waste plastics after cleaning into particles; Re-cleaning and air-drying the granular waste plastics; The air-dried granular waste plastic is placed in a furnace for melting to obtain molten plastic; The metal parts in the molten plastic are removed to obtain high-purity molten plastic; The high-purity molten plastic is discharged from the furnace and extruded by an extruder and cooled by a pipe forming machine to obtain a plastic pipe; Removing metal parts from molten plastic includes: The molten plastic is stirred by a stirring component to make the molten plastic move at a high speed; Putting a filter component capable of forming a receiving chamber into a furnace, after a period of time, after the filter component receives the metal component, taking the filter component outward and removing the metal component from the filter component; Repeat the above steps to remove all metal parts from the molten plastic; Wherein, the molten plastic can pass through the filter component, but the metal part cannot pass through the filter component; The filter component is formed with an inlet for allowing molten plastic and metal parts to enter the containing chamber; When the filter component is placed inside the molten plastic, the opening direction of the inlet is in line with the moving direction of the molten plastic; Taking out the filter component and removing the metal parts in the filter component includes: blocking the entrance by a blocking member that can move relative to the filter component; The filter element is moved by a driving member until the filter element leaves the molten plastic; After the filter component leaves the molten plastic, the filter component is rotated eccentrically relative to the center of the filter component by the driving member to throw the molten plastic in the containing chamber outward; A collection box capable of collecting metal pieces is moved to the bottom of the filter component by the driving member, and a blocking member is opened by the driving member to discharge the metal pieces into the collection box.

2. The process for producing plastic pipes by recycling waste plastics according to claim 1, characterized in that: The filter component comprises a first filter housing and a second filter housing; wherein a plurality of filter holes are formed on the first filter housing and the second filter housing; The first filter housing and the second filter housing overlap each other, and the filter holes of the first filter housing and the filter holes of the second filter housing partially overlap, so that a plurality of through holes through which molten plastic can pass but metal parts cannot pass are formed in the accommodating chamber.

3. The process for producing plastic pipes by recycling waste plastics according to claim 2, characterized in that: Placing the filter component capable of forming a receiving chamber into the furnace comprises: moving the first filter housing and the second filter housing relative to each other through the driving member, so that the filter holes of the first filter housing partially overlap with the filter holes of the second filter housing, and changing the size of the through hole; When the filter hole of the first filter housing partially overlaps with the filter hole of the second filter housing, the metal part cannot pass through the through hole; When the filter hole of the first filter housing completely overlaps with the filter hole of the second filter housing, the metal member can pass through the through hole.

4. The process for producing plastic pipes by recycling waste plastics according to claim 1, characterized in that: Cleaning stains on waste plastics includes: Use water mixed with detergent to rinse and agitate the waste plastics.

5. The process for producing plastic pipes by recycling waste plastics according to claim 4, characterized in that: The temperature of the water source mixed with the detergent is 80-90°C.

6. The process for producing plastic pipes by recycling waste plastics according to claim 2, characterized in that: A discharge plate is arranged in the accommodating chamber, and the discharge plate and the bottom surface of the accommodating chamber form an inclined surface extending downwardly, so that the metal parts on the discharge plate are discharged outward from the entrance due to their own gravity.

7. The process for producing plastic pipes by recycling waste plastics according to claim 6, characterized in that: The step of opening the blocking member by the driving member to discharge the metal members into the collection box comprises: the driving member drives the blocking member to move so that the inlet is opened; The driving member also drives the stripping plate to move, so that the end of the stripping plate away from the inlet moves upward, so that the metal parts on the stripping plate are discharged outward.

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