Regenerated plastic internal mixer

Abstract

The invention belongs to the technical field of reprocessed plastic mixing equipment, and particularly relates to a reprocessed plastic internal mixer which comprises a mixing machine box, a first hydraulic cylinder, an airflow channel and a fiber brush, two stirring rotors meshed with each other are arranged in the mixing machine box, the first hydraulic cylinder is arranged at the top of the mixing machine box, and an upper top bolt is installed on a cylinder rod of the first hydraulic cylinder; isolation spokes used for preventing blockage are fixed to the bottom of the airflow channel, and a rotating shaft, a three-jaw disc located on the rotating shaft and staggered with the isolation spokes and a driving element used for rotating the rotating shaft are arranged in the airflow channel; during banburying, the three-jaw disc extrudes mixed materials and leaks volatile matters at intervals between the three-jaw disc and the isolation spokes to prevent the volatile matters from gathering, so that the volatile matters are devolatilized along the airflow channel or refrigeration gas is introduced, and the regenerated plastic is banburying at one time. According to the invention, during pressure-maintaining internal mixing, a gap is reserved to leak volatile matters or refrigeration gas is introduced to prevent the volatile matters from gathering, and mixed materials are pushed to promote stirring, so that the regenerated plastic is internally mixed at one time.

Description

Technical Field

[0001] The present invention belongs to the technical field of recycled plastic blending equipment, and particularly relates to a recycled plastic internal mixer. Background Art

[0002] An internal mixer (also known as a closed rubber mixer) is a key equipment for mixing rubber compounds in industry. Its core function is to uniformly mix raw materials such as rubber (plastic), carbon black, fillers, and additives under high temperature and high pressure. In the aspect of recycled plastic recycling, the internal mixer extrudes, mixes, and cuts the recycled materials that have undergone pretreatment such as cleaning, sorting, and crushing through the rotor. The mixing time is usually shorter than that of virgin materials, avoiding the decrease in plasticity caused by long-term high temperature.

[0003] When mixing, recycled plastics have more volatile substances, such as moisture and degradation products. After retrieval, a Chinese invention with the publication number CN119347986A, an energy-saving variable-speed internal mixer for mixing rubber, adsorbs and treats volatile substances through an air supply pipe connected to the upper end face of the installation shell, avoiding the problem that a large amount of pungent odor generated during the processing reaction affects the working environment, and filtering and cooling the impurities carried in the volatile substances.

[0004] Existing mixing processes mostly use paired rotors to blend and mix materials through shear action and axial pushing action. However, there are still the following aspects that need to be improved when dealing with volatile substances: The pipeline connecting the mixing chamber sucks volatile substances under negative pressure conditions. However, recycled plastics expand when heated, easily blocking the pipe orifice, blocking the escape of volatile substances, causing the accumulation of volatile substances, which may cause bubbles, holes, or roughness on the surface of the mixed products.

[0005] There is an upper ram at the top of the mixing chamber. By lifting it for a short time to leave a certain gap for the volatile substances to escape, but the volatile substances will separate from the recycled plastics, unable to maintain pressure, which is not conducive to the one-time mixing of recycled plastics. Summary of the Invention

[0006] The purpose of the present invention is to provide a recycled plastic internal mixer that leaves a gap to leak volatile substances or introduce refrigerating gas while maintaining pressure and mixing, preventing the accumulation of volatile substances, and promoting stirring of the mixed materials, so as to mix recycled plastics in one go.

[0007] The technical solution adopted by the present invention is specifically as follows: A recycled plastic internal mixer, comprising: A mixing machine case, inside which two mutually meshing stirring rotors are arranged; A first hydraulic cylinder, which is arranged on the top of the mixing machine case and has an upper ram installed on its cylinder rod; An airflow channel, wherein isolation spokes for preventing blockage are fixed to the bottom of the airflow channel, and a rotating shaft, a three-claw disc intersecting the rotating shaft and the isolation spokes, and a driving element for rotating the rotating shaft are provided inside the airflow channel; During banburying, the three-claw disc extrude the mixed material and the volatiles are leaked out through the gaps between the disc and the isolation spokes, thereby preventing the volatiles from accumulating, and devolatilizing or introducing refrigerant gas along the air flow channel, thereby banburying the recycled plastics at one time; A fiber brush is arranged on the top wall of the air flow channel and is used to remove attachments on the surface of the three-claw disc and filter impurities during the devolatilization process.

[0008] As an optional solution, two fans are installed on the top of the air flow channel, respectively used to blow in refrigerant gas and discharge volatiles. The air flow channel is connected to a bellows, and a control branch and a refrigerant gas tank connected to the bellows are provided outside the mixing chassis.

[0009] As an optional solution, the outer side of the three-claw disc is provided with ventilation grooves, a carrying belt and a buffer groove at intervals, and pusher teeth for pushing the mixed material and memory alloy plates for buffering the pusher teeth are fixed on both sides of the carrying belt respectively, and a magnetic arc plate is fixed between the outer side of the memory alloy plate and the inner wall of the buffer groove; When part of the mixed material sticks to the gap between the isolating spokes, the pusher teeth push away this part of the mixed material due to the rebound effect of the memory alloy plate, and at the same time, the magnetic arc plate attracts and limits the pusher teeth through its magnetic field; When the breathable groove is connected to the isolation spoke interval, it is used to circulate volatile substances or refrigerant gas; When the pusher teeth enter the spacing between the isolating spokes, they are used to push the mixed material to contact the stirring rotor, thereby increasing the friction of the mixed material.

[0010] As an optional solution, the fiber brush includes a curved supporting plate located on the top wall of the airflow channel and bristles mounted on the inner curved surface of the supporting plate; The bristles are forked in a "Y" shape, and the forked portion is used to remove attachments on the surface of the pusher teeth. The bristles are made of fiber material and filter impurities during the devolatilization process.

[0011] As an optional solution, the inner arc surface of the carrying plate is provided with a slide groove, a slide key located inside the slide groove, and an elastic member, and the outer surface of the slide key is fixedly connected to the root of the bristle; When the fiber brush is squeezed, it drives the sliding key to slide along the sliding groove, compressing the elastic member until the elastic member rebounds, so that the fiber brush is reset to brush the three-claw disc back and forth.

[0012] As an optional solution, the control branch includes a controller arranged outside the mixing box, a three-way valve and an outlet valve connected to the controller, and two interfaces of the three-way valve are respectively connected to the outlet end of the outlet valve and the top of the bellows; When opened, the three-way valve circulates refrigerant gas or clean air.

[0013] As an optional solution, a base, a hopper and a first gear box are spaced apart at the bottom of the mixing chassis, a bearing bracket for supporting the stirring rotor is installed on the base, and the stirring rotor passes through the hopper and the first gear box.

[0014] As an optional solution, the machine base is equipped with a servo motor, a transmission member, a reducer and a transmission shaft connected in sequence; Wherein, the transmission shaft is coaxially connected to one of the stirring rotors.

[0015] As an optional solution, it further includes a second hydraulic cylinder, and an articulated arm and an articulated seat respectively located at two ends of the second hydraulic cylinder; Wherein, the top of the articulated arm is fixed to one side of the hopper, and the articulated seat is fixed to the upper surface of the machine base.

[0016] As an optional solution, the driving unit includes a servo motor installed inside the air flow channel and a second gear box, and the second gear box transmission is used for transmission between the servo motor and the rotating shaft.

[0017] The technical effects achieved by the present invention are: During mixing, the three-claw disc squeezes the mixed material and the gaps between the spokes allow volatiles to escape, preventing their accumulation. This allows for devolatilization or the introduction of refrigerant gas along the airflow path, maintaining pressure throughout the entire process without the need to lift the top bolt, thereby allowing the recycled plastic to be mixed in one go. A fiber brush with good air permeability filters out some impurities while also shaking away any impurities attached to the surface of the three-claw disc.

[0018] The "V"-shaped breathable groove and pusher teeth on the outer side of the three-claw disc of the present invention can cooperate with the isolation spokes to achieve simultaneous pressure maintenance and devolatilization; when the breathable groove is connected to the isolation spoke interval, the interval and the air flow channel remain unobstructed, which is used to circulate volatile substances or refrigerant gases; or when the pusher teeth enter the isolation spoke interval, the interval is temporarily closed, and the pusher teeth are used to push the mixed material to contact the stirring rotor, thereby improving the stirring effect, and the isolation spokes continuously press down the mixed material, which can maintain pressure throughout the entire process and prevent interruption of the production rhythm.

[0019] When the mixing part of the present invention adheres to the gap of the isolation spoke, through the resilience of the shape memory alloy plate, the pushing teeth push aside this part of the mixture. At the same time, since the pushing teeth are made of magnetic metal material with a wear-resistant and anti-sticking coating, the magnetic arc plate attracts and limits the pushing teeth through its magnetic field, preventing the pushing teeth from pulling the carrier belt out of the air flow channel and preventing the mixture from penetrating into the gap between the carrier belt and the air flow channel.

[0020] When the "Y"-shaped fiber brush of the present invention is squeezed, it drives the sliding key to slide along the sliding groove and compress the elastic member until the elastic member rebounds to reset the fiber brush, so as to reciprocally brush the three-jaw disc, and shake off impurities such as organic matter particles and inorganic fillers through the inertia of the reciprocating motion. The impurities can fall back into the hopper and be combined with the mixture to achieve recycling. Among them, the particle size of the pyrolytic carbide is small and can pass through the bristles to achieve devolatilization, preventing the quality of the product from being reduced. Description of the Drawings

[0021] Figure 1 is the front view of a regenerative plastic internal mixer of the present invention; Figure 2 is the side view of a regenerative plastic internal mixer of the present invention; Figure 3 is the rear view of the discharging state of the hopper of a regenerative plastic internal mixer of the present invention; Figure 4 is the side view of the hopper of the present invention; Figure 5 is the front view of the hopper of the present invention; Figure 6 is the front view of the meshing state of two stirring rotors of the present invention; Figure 7 is the cross-sectional view of the upper plug of the present invention; Figure 8 is the front view of the rotating shaft of the present invention; Figure 9 is the side view of the rotating shaft of the present invention; Figure 10 is the side view of the three-jaw disc of the present invention; Figure 11 is the front view of the magnetic arc plate and the shape memory alloy plate welded together of the present invention; Figure 12 is the bottom view of the carrier plate of the present invention; Figure 13 is the front view of the sliding key of the present invention; Figure 14 is the system block diagram of the controller of the present invention.

[0022] In the drawings, the list of components represented by each reference numeral is as follows: 1. Mixing chassis; 101. Stirring rotor; 102. Machine base; 103. Bearing bracket; 104. Hopper; 105. First gearbox; 2. First hydraulic cylinder; 201. Upper plug; 202. Fan; 203. Bellows; 204. Refrigerant gas tank; 205. Controller; 206. Three-way valve; 207. Exhaust valve; 3. Air flow channel; 301. Isolation spoke; 302. Rotating shaft; 303. Three-jaw disc; 3031. Venting groove; 3032. Carrier belt; 3033. Pushing teeth; 3034. Buffer groove; 3035. Magnetic arc plate; 3036. Shape memory alloy plate; 304. Servo motor; 305. Second gearbox; 4. Fiber brush; 401. Carrier plate; 402. Brush bristles; 403. Slide groove; 404. Slide key; 405. Elastic member; 5. Servo motor; 6. Transmission member; 7. Reducer; 8. Transmission shaft; 9. Hinge arm; 10. Second hydraulic cylinder; 11. Hinge seat. Detailed implementation manners

[0023] In order to make the objectives and advantages of the present invention clearer and more understandable, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0024] For the recycling of recycled plastics, generally, the recycled materials are put into a mixer and mixed with additives. For example, PE (polyethylene) is added with POE elastomer through mixing. Setting the temperature at 170 (taking LDPE, low-density polyethylene as an example) and controlling the rotation speed at 80 r / min, through the stirring action, folding action, and axial reciprocating cutting / stirring action of the rotor, they can be mixed evenly, improving consistency, compatibility, and restoring a certain degree of strength and toughness.

[0025] As Figures 1 - 14 shown, a recycled plastic mixer includes a mixing chassis 1 and a first hydraulic cylinder 2. During operation, the recycled materials and additives are mixed into a mixture and added to the mixing chassis 1. Since there are two mutually meshing stirring rotors 101 inside the mixing chassis 1, the shearing and pushing actions of the stirring rotors 101 can be used for mixing. The first hydraulic cylinder 2 is arranged on the top of the mixing chassis 1 and the cylinder rod is equipped with an upper plug 201. At the same time, the first hydraulic cylinder 2 is used to lower the upper plug 201 to press the mixture down to enhance friction and promote mixing.

[0026] Among them, the first hydraulic cylinder 2 controls the oil circuit through a reversing valve to achieve extension and retraction. Among them, under the action of an external oil pump, the pressure oil enters from the rodless cavity, pushing the piston to move forward to lower the upper plug 201. Conversely, the pressure oil enters from the rod cavity, pushing the piston to move backward to drive the upper plug 201 to reset. During this process, the output force is proportional to the pressure.

[0027] Refer to the attached Figure 2 , Figure 3 and Figure 4 , in order to make the two stirring rotors 101 mesh stably, the base 102, the hopper 104 and the first gearbox 105 are arranged at intervals at the bottom of the mixing machine case 1. The two stirring rotors 101 penetrate through the hopper 104 and the first gearbox 105, so that the two stirring rotors 101 are driven by the first gear and can rotate synchronously to extrude and shear the mixed materials. In order to make the hopper 104 suspended, a bearing bracket 103 for supporting the stirring rotor 101 is installed on the base 102, and one of the stirring rotors 101 is supported by the bearing of the bearing bracket 103, while the other stirring rotor 101 is mainly supported by the hopper 104.

[0028] Refer to the attached Figure 1 , Figure 2 and Figure 3 , in order to make the two stirring rotors 101 rotate stably, a servo motor 5, a transmission member 6, a reducer 7 and a transmission shaft 8 are sequentially connected and installed on the base 102; among them, since the transmission shaft 8 is coaxially connected to one of the stirring rotors 101, when the servo motor 5 is started, the inner gear of the reducer 7 is driven to rotate through the transmission member 6 to provide power for the transmission shaft 8, and then drive the two stirring rotors 101 to rotate. And due to the tooth module ratio of the inner gear of the reducer 7, the rotation speed of the stirring rotor 101 can be reduced, and the servo motor 5 can be selected from the YEJ series three-phase asynchronous motor, and the output power is relatively stable.

[0029] For the selection of the transmission member 6, it can be belt drive or hinge drive. Preferably, 4 belts are arranged side by side for transmission, and it can brake without dead angle at 360°.

[0030] Refer to the attached Figure 3 , Figure 4 and Figure 14 , in order to automatically switch the state of the hopper 104, the present embodiment also sets a second hydraulic cylinder 10, and a hinge arm 9 and a hinge seat 11 respectively located at both ends of the second hydraulic cylinder 10. The hinge seat 11 is fixed on the upper surface of the base 102 by bolts for load bearing. The second hydraulic cylinder 10 also uses a reversing valve to control the oil circuit like the first hydraulic cylinder 2 to realize extension and retraction. Under the action of an external oil pump, when feeding, the cylinder rod extends to push the hinge arm 9 and the hopper 104 to rotate forward until the upper arc surface of the hopper 104 abuts against the arc surface of the feeding channel of the mixing machine case 1 and closes tightly. On the contrary, when discharging, the cylinder rod retracts to pull the hinge arm 9 and the hopper 104 to rotate backward until the hopper 104 is inclined downward relative to the ground so that the mixed materials can slide down; Among them, the top of the articulated arm 9 is welded to one side of the hopper 104, and the bottom is bifurcated and hinged to the rod of the second hydraulic cylinder 10, and the hinge point is far from the hopper 104, and this welding point is aligned with one of the stirring rotors 101, so that when the hopper 104 is pushed or pulled, it can rotate around this stirring rotor 101.

[0031] The upper plug 201 of the traditional internal mixer leaves a certain gap for a short time to allow volatile substances to escape, but it will separate from the mixed material and cannot maintain pressure, which is not conducive to the one-time internal mixing of the mixed material. In addition, the capacity of the hopper 104 is limited. As the number of times of waiting for volatile substances increases, the production plan is delayed to a certain extent.

[0032] Refer to the appendix Figure 1 、 Figure 7 and Figure 8 In order to facilitate the one-time internal mixing of the mixed material, in this embodiment, 2 air flow channels 3 are also arranged at intervals on the upper plug 201 for devolatilization. Since 9 isolation spokes 301 for anti-blocking are welded side by side at the bottom of the air flow channels 3, while blocking the mixed material, volatile substances can flow through the gap, and it is also convenient for the upper plug 201 to maintain pressure. There is no need to lift the upper plug 201 during the internal mixing process, and the production rhythm will not be interrupted; Furthermore, a rotating shaft 302, a three-jaw disc 303 located at the intersection of the rotating shaft 302 and the isolation spokes 301, and a driving element for rotating the rotating shaft 302 are arranged inside the air flow channel 3; when internal mixing, the driving element rotates the rotating shaft 302 and the three-jaw disc 303 until the protrusion of the three-jaw disc 303 passes through the gap between the isolation spokes 301, and the mixed material can be extruded by the three-jaw disc 303 and volatile substances can leak out through the interval between the isolation spokes 301 to prevent the accumulation of volatile substances, so as to devolatilize along the air flow channel 3, thereby internally mixing recycled plastics at one time; Still further, the isolation spokes 301 have a double-bent arc, which can extrude the mixed material with the arc surface, can also avoid the stirring rotor 101, and a certain space is left at the middle position of the double bend for exposing the protrusion of the three-jaw disc 303 for pushing the mixed material.

[0033] Refer to the appendix Figure 2 、 Figure 7 and Figure 14 In order to accelerate devolatilization, in this embodiment, two fans 202 are respectively installed at the tops of the two air flow channels 3 and fixed with screws, which are respectively used for blowing in refrigerating gas and discharging volatile substances, and the air flow channel 3 is communicated with a corrugated pipe 203. When the upper plug 201 rises, the corrugated pipe 203 will be compressed, or when it descends, the corrugated pipe 203 will be stretched, so that the gas path remains unobstructed.

[0034] Refer to the appendix Figure 2 、 Figure 7 and Figure 13In order to facilitate the provision of refrigerant gas, this embodiment further provides a refrigerant gas tank 204, a controller 205, a three-way valve 206 connected to the controller 205, and an outlet valve 207 outside the mixing box 1. The two interfaces of the three-way valve 206 are respectively connected to the air outlet of the air conditioning system and the top of the bellows 203, and the other interface is connected to the refrigerant gas tank 204 through the outlet valve 207. When the refrigerant gas tank 204 is opened, the three-way valve 206 is controlled to circulate refrigerant gas. Refrigerant gas can be added along the two air flow channels 3 to remove the heat of the mixed material and prevent burning, or clean air can be introduced to increase the internal pressure of the hopper 104, thereby squeezing out volatiles and improving the devolatilization efficiency. The controller 205 may be a Mitsubishi series PLC or an industrial computer of another brand, the three-way valve 206 may be a VB3000 or VB7000 electric three-way valve, the outlet valve 207 may be a 2W025-08 electric valve, and the refrigeration tank 204 may be filled with argon or nitrogen as a refrigerant gas, which does not react with the mixed material but only takes away the heat of the mixed material to prevent the product from being burned due to overheating. As an optional embodiment, see Figure 14 The controller 205 controls the first hydraulic cylinder 2, the three-way valve 206, the outlet valve 207, the second hydraulic cylinder 10, and the servo motor 5 with RS485 signals. The program can be written in advance for control without manual operation or opening of the valve.

[0035] Refer to the attached Figure 8 、 Figure 9 and Figure 10 , the outer side of the three-claw disc 303 is provided with "V"-shaped breathable grooves 3031, a carrying belt 3032 and a buffer groove 3034 at intervals. Pushing teeth 3033 for pushing the mixed material and memory alloy plates 3036 for buffering the pushing teeth 3033 are respectively bonded on both sides of the carrying belt 3032 with high-temperature resistant glue, wherein the pushing teeth 3033 can cooperate with the isolation spokes 301 to achieve simultaneous pressure maintenance and devolatilization. Since a magnetic arc plate 3035 is welded between the outer side of the memory alloy plate 3036 and the inner wall of the buffer groove 3034, the intersecting magnetic arc plates 3035 and the memory alloy plates 3036 jointly support the carrying belt 3032. Once the pushing teeth 3033 come into contact with the mixed material, they will squeeze the carrying belt 3032 and the memory alloy plate 3036 into the buffer groove 3034 for buffering; When the mixed material partially sticks to the gap between the isolation spokes 301, the pusher teeth 3033 push this part of the mixed material away due to the rebound effect of the memory alloy plate 3036. At the same time, because the pusher teeth 3033 are made of a magnetic metal material with a wear-resistant and anti-stick coating, the magnetic arc plate 3035 attracts the limiting pusher teeth 3033 through its magnetic field, preventing the pusher teeth 3033 from pulling the carrier belt 3032 out of the air flow channel 3, thereby preventing the mixed material from penetrating the gap between the carrier belt 3032 and the air flow channel 3. When the ventilation groove 3031 communicates with the intervals of the isolation spokes 301, the intervals are kept unobstructed from the air flow channel 3 for circulating volatile substances or refrigerating gases; When the pushing teeth 3033 enter the intervals of the isolation spokes 301, the intervals are temporarily closed to push the mixed material into contact with the stirring rotor 101, thereby enhancing the stirring effect. Moreover, the isolation spokes 301 continuously press down on the mixed material to maintain pressure throughout the process and prevent interruption of the production rhythm.

[0036] Among them, referring to Figure 10 , the pushing teeth 3033 can be semi-circular, double-pointed folded or one-way arcuate arrow-shaped. Taking the semi-circular shape as an example, it can extend out of the intervals of the isolation spokes 301 to contact the mixed material to achieve pushing and extrusion, and can also rotate with the three-jaw disc 303 and hide inside the air flow channel 3 to leave space for the ventilation groove 3031 for devolatilization.

[0037] Referring to the appendix Figure 7 , Figure 8 and Figure 9 , the driving element includes a servo motor 304 and a second gearbox 305 installed inside the air flow channel 3. The controller 205 controls the servo motor 304 with RS485 signals. When the servo motor 304 is started, since the second gearbox 305 is used for the transmission between the servo motor 304 and the rotating shaft 302, it can rotate the rotating shaft 302 and the three-jaw disc 303. Moreover, the driving element avoids the first hydraulic cylinder 2 to leave enough compression area for the first hydraulic cylinder 2 to press down the upper plug 201 to prevent collapse caused by extrusion. At the same time, through the modulus ratio effect of the second gears in the second gearbox 305, the rotating shaft 302 rotates the three-jaw disc 303 at a lower speed.

[0038] Referring to the appendix Figure 7 and Figure 8 , in this embodiment, a fiber brush 4 is further provided on the top wall of the air flow channel 3. Since the fiber brush 4 is in interference fit with the protrusions of the three-jaw disc 303, it is used to brush off the attachments on the surface of the three-jaw disc 303. Moreover, since the fiber brush 4 is made of breathable fiber material, it can allow volatile gases to pass through and filter particles to filter impurities during the devolatilization process.

[0039] Referring to the appendix Figure 8 , Figure 12 and Figure 13 , the fiber brush 4 includes a curved bearing plate 401 located on the top wall of the air flow channel 3 and bristles 402 installed on the inner arc surface of the bearing plate 401. Since the bearing plate 401 is installed on the top wall of the air flow channel 3 by screws, it can drive the bristles 402 to be suspended to prevent blockage; Among them, the bristles 402 are in a "Y"-shaped fork, and the fork is used to remove the attachments on the surface of the push teeth 3033. The bristles 402 are made of one or more blends of nylon, carbon fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, and pertex (microfiber nylon), which are convenient for ventilation and can filter impurities during the devolatilization process. They are also wear-resistant, not easy to break, and can keep in contact with the three-claw disc 303 for a long time.

[0040] Refer to the attached Figure 8 、 Figure 12 and Figure 13 As impurities accumulate, the air permeability of the bristles 402 decreases. For this reason, in this embodiment, a slide groove 403, a slide key 404 located inside the slide groove 403 and an elastic member 405 are provided on the inner arc surface of the carrier plate 401. Since the outer surface of the slide key 404 is bonded to the root of the bristles 402, when the fiber brush 4 is squeezed, the slide key 404 is driven to slide along the slide groove 403, compressing the elastic member 405 until the elastic member 405 rebounds, so that the fiber brush 4 is reset, and the three-claw disc 303 is brushed back and forth, and impurities such as organic particles and inorganic fillers are shaken off by the inertia of the reciprocating motion, which can fall back into the hopper 104 and combine with the mixed material to achieve recycling. The particle size of the pyrolytic carbide is small and can pass through the bristles 402 to achieve devolatilization and prevent the quality of the product from being reduced.

[0041] The working principle of the present invention is: when working, the recycled material and the additive are mixed into a mixture and added into the mixing box 1, and the mixing is carried out by the shearing and pushing action of the stirring rotor 101, and the upper push bolt 201 is lowered by the first hydraulic cylinder 2 to press the mixture downward to enhance friction and promote mixing.

[0042] At the same time, the driving unit rotates the rotating shaft 302 and the three-claw disc 303 until the protrusion of the three-claw disc 303 passes through the gap between the isolation spokes 301. The three-claw disc 303 can extrude the mixed material and the volatiles can leak out through the gap between the three-claw disc 303 and the isolation spokes 301, preventing the volatiles from accumulating and devolatilizing along the air flow channel 3, thereby refining the recycled plastic in one go.

[0043] When the refrigeration tank 204 is opened, the three-way valve 206 is controlled to circulate the refrigeration gas. Refrigeration gas can be added along the two air flow channels 3 to remove the heat of the mixture and prevent burning, or clean air can be introduced to increase the internal pressure of the hopper 104, thereby squeezing out volatiles and improving the devolatilization efficiency.

[0044] Since the fiber brush 4 has an interference fit with the protrusions of the three-jaw disc 303, the attachments on the surface of the three-jaw disc 303 are brushed off by the fiber brush 4. And because the fiber brush 4 is made of breathable fiber material, volatile gases and filtered particles can pass through it to filter impurities during the devolatilization process. When the fiber brush 4 is squeezed, it drives the sliding key 404 to slide along the chute 403, compressing the elastic member 405 until the elastic member 405 rebounds, resetting the fiber brush 4 to brush the three-jaw disc 303 reciprocally, and shaking off impurities such as organic particles and inorganic fillers through the inertial effect of the reciprocating motion, which then fall back into the hopper 104 and combine with the mixed material to achieve recycling. Among them, the pyrolytic carbide has a smaller particle size and passes through the bristles 402 to achieve devolatilization.

[0045] When discharging, the cylinder rod retracts, pulling the articulated arm 9 and the hopper 104 to reverse until the hopper 104 is inclined downward relative to the ground, enabling the mixed material to slide off.

[0046] The above are only optional embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention are implemented according to the conventional means in the art without special instructions and limitations.

Claims

1. A recycled plastic internal mixer, characterized in that Including: A mixing cabinet (1), inside which there are two mutually meshing stirring rotors (101); A first hydraulic cylinder (2), which is arranged on the top of the mixing cabinet (1) and a top plug (201) is installed on the cylinder rod; An air flow channel (3), at the bottom of which there is an isolation spoke (301) for preventing blockage, inside which there is a rotating shaft (302), a three-claw disc (303) located at the intersection of the rotating shaft (302) and the isolation spoke (301), and a driving element for rotating the rotating shaft (302); During internal mixer operation, the three-claw disc (303) extrudes the mixed material, and the volatiles leak out through the space between the isolation spokes (301) to prevent the volatiles from accumulating, so as to devolatilize along the air flow channel (3) or introduce refrigerating gas, thereby regenerating plastic by internal mixer operation at one time; A fiber brush (4), which is arranged on the top wall of the air flow channel (3) and is used for brushing off the attachments on the surface of the three-claw disc (303) and the filter impurities during the devolatilization process.

2. The regenerated plastic internal mixer according to claim 1, wherein: Two fans (202) are installed at the top of the air flow channel (3), which are respectively used for blowing in refrigerating gas and discharging volatiles. The air flow channel (3) is communicated with a corrugated pipe (203), and outside the mixing cabinet (1) there is a control branch and a refrigerating gas tank (204) communicated with the corrugated pipe (203).

3. The internal mixer for recycled plastics according to claim 1, wherein: Ventilation grooves (3031), a carrier belt (3032) and buffer grooves (3034) are arranged at intervals on the outside of the three-claw disc (303). On both sides of the carrier belt (3032), there are respectively a pusher tooth (3033) for pushing the mixed material and a shape memory alloy plate (3036) for buffering the pusher tooth (3033). A magnetic arc plate (3035) is fixed between the outside of the shape memory alloy plate (3036) and the inner wall of the buffer groove (3034); When a part of the mixed material adheres to the gap between the isolation spokes (301), through the rebounding action of the shape memory alloy plate (3036), the pusher tooth (3033) pushes away this part of the mixed material, and at the same time the magnetic arc plate (3035) attracts and limits the pusher tooth (3033) through its magnetic field.

4. The regenerated plastic internal mixer according to claim 3, characterized in that: The fiber brush (4) includes a curved bearing plate (401) located on the top wall of the air flow channel (3) and bristles (402) installed on the inner arc surface of the bearing plate (401); Among them, the bristles (402) are in a "Y"-shaped bifurcated shape, and the bifurcated part is used for brushing off the attachments on the surface of the pusher tooth (3032), and the bristles (402) are made of fiber material and filter impurities during the devolatilization process.

5. The regenerated plastic internal mixer according to claim 4, characterized in that: A chute (403), a sliding key (404) located inside the chute (403) and an elastic member (405) are arranged on the inner arc surface of the bearing plate (401), and the outer surface of the sliding key (404) is fixedly connected to the root of the bristle (402); When the fiber brush (4) is squeezed, it drives the sliding key (404) to slide along the sliding groove (403), compresses the elastic member (405), until the elastic member (405) rebounds, causing the fiber brush (4) to reset, so as to reciprocally brush the three-jaw disc (303).

6. The a kind of regenerated plastics internal mixer according to claim 2, characterized in that: The control branch includes a controller (205) disposed outside the mixing machine case (1), a three-way valve (206) and an air outlet valve (207) connected to the controller (205). Two interfaces of the three-way valve (206) are respectively communicated with the air outlet end of the air outlet valve (207) and the top of the corrugated pipe (203). When opened, the three-way valve (206) circulates refrigerating gas or clean air.

7. A regenerated plastic internal mixer according to claim 1, characterized in that: The bottom of the mixing machine case (1) is provided with a machine base (102), a hopper (104) and a first gear box (105) at intervals. A bearing bracket (103) for supporting the stirring rotor (101) is installed on the machine base (102), and the stirring rotor (101) penetrates through the hopper (104) and the first gear box (105).

8. The a regenerated plastic internal mixer according to claim 7, wherein: A servo motor (5), a transmission member (6), a speed reducer (7) and a transmission shaft (8) are sequentially connected and installed on the machine base (102). Wherein, the transmission shaft (8) is coaxially connected to one of the stirring rotors (101).

9. The a kind of recycled plastic internal mixer according to claim 7, characterized in that: It further includes a second hydraulic cylinder (10), and a hinge arm (9) and a hinge seat (11) respectively located at both ends of the second hydraulic cylinder (10). Wherein, the top of the hinge arm (9) is fixed to one side of the hopper (104), and the hinge seat (11) is fixed to the upper surface of the machine base (102).

10. A regenerated plastic internal mixer according to claim 1, characterized in that: The driving element includes a servo motor (304) and a second gear box (305) installed inside the air flow channel (3). The second gear box (305) is used for transmission between the servo motor (304) and the rotating shaft (302).

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