Extrusion friction granulation device and production process of regenerated chips

Abstract

The application relates to the technical field of regenerated chip production, in particular to an extrusion and sending type friction granulation device and a regenerated chip production process, which comprises a base, the base is provided with a spiral feeding device and a disc type friction device, the disc type friction device comprises: an outer shell body connected with the spiral feeding device, the outer shell body is provided with oppositely arranged first and second friction discs, the first and second friction discs can be matched to make the material entering the outer shell body hot melt; a scraping piece arranged in the scraping piece, the scraping piece is used for scraping the molten material; an adjusting mechanism capable of adjusting the gap and pressure between the first and second friction discs; an extension rod connected with the second friction disc, the end of the extension rod is provided with an abutting portion matched with a protruding portion arranged on the side of the first friction disc, the abutting portion can rotate the scraping piece when the gap between the first and second friction discs is smaller than a preset value, so that wall sticking or excessive load is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of regenerated chip production, and particularly relates to an extrusion type friction granulation device and a regenerated chip production process. BACKGROUND

[0002] In the production of the existing regenerated chip, the color of the regenerated material is often grayish or yellowish, so a proper amount of black master batch is added to effectively cover the mixed color by using the high-concentration carbon black in the black master batch, so that the chip presents a uniform black color.

[0003] The production steps of the existing regenerated chip are: crushing, melting and extruding, filtering, adding black master batch and blending, underwater granulation, centrifugal dewatering, vibration screening, homogenizing and mixing, detection and packaging.

[0004] The friction granulation is a link in the production of regenerated chips, and in the existing friction granulation machine, the friction gap and pressure need to be controlled according to the properties of the hot-melt material, which leads to different heat generated by the friction of raw materials with different properties, and the heat will form different temperatures on the inner wall of the equipment through conduction. In the high-temperature case, the hot-melt material is prone to adhere to the inner wall of the equipment to form a risk of wall sticking, at which time a rotary scraper is needed to forcibly scrape the inner wall of the equipment. However, in the low-temperature case, the above-mentioned wall sticking phenomenon rarely occurs or even does not occur, and in the low-temperature case, the hot-melt material has poor flowability, and if the scraper rotates, the load of the equipment will increase. In these two cases, the existing friction granulation machine cannot well adapt to materials with different properties. SUMMARY

[0005] The present application aims to provide an extrusion type friction granulation device and a regenerated chip production process to solve the problems in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an extrusion type friction granulation device, comprising: a base, a screw feeding device and a disc friction device are arranged on the base; the disc friction device comprises: an outer shell connected with the screw feeding device, a first friction disc and a second friction disc are arranged oppositely in the outer shell, and the first friction disc and the second friction disc cooperate to enable the material entering the outer shell to be hot-melted; a scraping member is arranged in the scraping member, and the scraping member is used for scraping the molten material adhered in the outer shell; an adjusting mechanism is arranged on the outer shell and connected with the second friction disc, and the adjusting mechanism can adjust the gap and pressure between the first friction disc and the second friction disc; an extension rod is connected with the second friction disc, and an abutting portion is arranged at the end of the extension rod, the abutting portion cooperates with a protruding portion arranged on the side of the first friction disc, and when the gap between the first friction disc and the second friction disc is less than a preset value, the scraping member can be rotated.

[0007] As a further scheme of the present application: the first friction disc is rotatably installed in the outer shell; the opposite sides of the first friction disc and the second friction disc are respectively provided with a plurality of friction planes, the plurality of friction planes are connected through annular material guiding slopes, and the first friction disc and the second friction disc are provided with protrusions; along the radial direction of the first friction disc, the gaps between the plurality of friction planes on the first friction disc and the second friction disc gradually increase or decrease.

[0008] As a further scheme of the present application: the adjusting mechanism comprises: an elastic component connected to the second friction disc and penetrating through the outer shell; a threaded propulsion component connected to the elastic component, the threaded propulsion component can store or release elastic potential energy when in action; an annular support fixedly installed on the outer shell, a plurality of grooved wheels are circumferentially and equidistantly arranged on the annular support, a tooth ring is arranged between the plurality of grooved wheels, the tooth ring is engaged with a gear connected to the threaded propulsion component, and the tooth ring is connected to a driving device arranged on the spiral feeding device.

[0009] As a further scheme of the present application: the elastic component comprises a lagging sleeve connected to the second friction disc and penetrating through the outer shell, an abutting plate is slidably installed in the lagging sleeve, a connecting shaft penetrating through the lagging sleeve is arranged on the abutting plate, and the cross section of the connecting shaft is square; a cylindrical spring is further arranged in the lagging sleeve, one end of the cylindrical spring is connected to the inner wall of the lagging sleeve, and the other end of the cylindrical spring is connected to the abutting plate.

[0010] As a further scheme of the present application: the threaded propulsion component comprises a threaded rod fixedly connected to the connecting shaft, a threaded sleeve threadedly connected to the threaded rod is arranged on the threaded rod, the threaded sleeve is rotatably installed on the annular support, and the threaded sleeve is coaxially and fixedly connected to the gear.

[0011] As a further scheme of the present application: a plurality of hollow grooves are circumferentially and equidistantly arranged on the scraping member, a material scraping slope is arranged on one side of the hollow groove; a plurality of lagging grooves are circumferentially and equidistantly arranged on the scraping member, and the extension rod is slidably arranged in the lagging groove.

[0012] As a further scheme of the present application: a follow-up ring is rotatably arranged on the side of the second friction disc, a plurality of fitting parts adapted to the hollow grooves are circumferentially and equidistantly arranged on the side of the follow-up ring; the extension rod is fixedly connected to the follow-up ring.

[0013] As a further scheme of the present application: an inclined shovel part is arranged on the end of the extension rod away from the follow-up ring, when the follow-up ring moves towards the first friction disc following the second friction disc, the inclined shovel part can shovel out the material in the lagging groove.

[0014] A process for regenerating slices, comprising the following steps: the raw material is crushed by a crusher and then conveyed to the above-mentioned extrusion friction pelletizing device, the material generated by friction pelletizing is sucked into four large material tanks for storage by a suction machine, then the raw material is mixed by a mixer and conveyed to a drying tower for drying treatment, after drying is completed, the injection strip is extruded and cooled by a double screw extruder in a vacuum state, and finally the injection strip is cut and pelletized by a pelletizer.

[0015] Compared with the prior art, the beneficial effects of the present application are: by setting the scraping part, the extension rod, the abutting part, the protruding part, when the material of different materials is frictionally hot-melted, the scraping part can be selectively driven to rotate according to the distance between the first friction disc and the second friction disc, so that the scraping part does not follow the first friction disc to rotate when the inner wall of the outer shell is low temperature and does not cause wall sticking, thereby reducing the rotating resistance of the first friction disc and preventing the external driving motor from being overloaded, and when the inner wall of the outer shell is high temperature and causes wall sticking, the scraping part can follow the first friction disc to rotate to scrape the material adhered to the inner wall of the outer shell, thereby preventing the "wall sticking risk".

[0016] By setting the first friction disc and the second friction disc, the friction of the material can be gradually intensified during movement, so that the material can gradually heat-melt, the heat-melting effect of the material is improved to a certain extent, and the situation that the local material is completely heat-melted due to the movement of the heat-melted material wrapping the non-heat-melted material is prevented. At the same time, since the distance between the two outermost friction planes is smaller, the material can be restrained between the first friction disc and the second friction disc during the initial entry of the material into the first friction disc and the second friction disc. Compared with the existing flat friction disc, the present application effectively avoids the situation that the material slips off the first friction disc and the second friction disc and causes the local material to be unable to heat-melt. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Structure schematic view of an embodiment of the extrusion friction pelletizing device;

[0018] Figure 2 Structure explosion view of an embodiment of the extrusion friction pelletizing device;

[0019] Figure 3 Structure schematic view of the disc friction equipment in an embodiment of the extrusion friction pelletizing device;

[0020] Figure 4 Structure explosion view of the disc friction equipment in an embodiment of the extrusion friction pelletizing device;

[0021] Figure 5 Structure schematic view of the first friction disc in an embodiment of the extrusion friction pelletizing device;

[0022] Figure 6 Structure diagram of the second friction disc and the follower ring in one embodiment of the extruding friction granulating device;

[0023] Figure 7 Structure diagram of the adjusting mechanism in one embodiment of the extruding friction granulating device;

[0024] Figure 8 Structure diagram of the elastic assembly and the threaded advancing assembly in one embodiment of the extruding friction granulating device;

[0025] Figure 9 Structure diagram of the scraping member and the follower ring in one embodiment of the extruding friction granulating device.

[0026] In the figure: 1, base; 2, screw feeding device; 3, outer shell; 4, first friction disc; 401, friction plane; 402, material guiding slope; 403, protrusion; 5, second friction disc; 6, scraping member; 601, hollow groove; 602, material scraping slope; 603, lagging groove; 7, driving device; 8, gear ring; 9, gear; 10, threaded sleeve; 11, threaded rod; 12, connecting shaft; 13, abutting plate; 14, cylindrical spring; 15, lagging sleeve; 16, follower ring; 1601, fitting part; 17, extension rod; 1701, abutting part; 18, protruding part; 19, annular support; 20, groove wheel. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] In addition, the elements in the present application are referred to as "fixed to" or "provided on" another element, which can be directly on another element or can have a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or can have a middle element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0029] Please refer to Figures 1-9 In the embodiments of the present application, an extruding friction granulating device comprises a base 1, wherein the base 1 is provided with a screw feeding device 2 and a disc friction device.

[0030] The outer shell 3 is connected with the spiral feeding device 2, the first friction disc 4 and the second friction disc 5 are arranged oppositely in the outer shell 3, the first friction disc 4 and the second friction disc 5 can make the material in the outer shell 3 heat melt, the first friction disc 4 is rotatably installed in the outer shell 3, the opposite side of the first friction disc 4 and the second friction disc 5 is provided with a plurality of groups of friction planes 401, a plurality of groups of the friction planes 401 are connected through the annular material guiding slope 402, and the first friction disc 4 and the second friction disc 5 are provided with the protrusion 403, along the radial direction of the first friction disc 4, the gap between a plurality of groups of the friction planes 401 on the first friction disc 4 and the second friction disc 5 gradually increases or decreases.

[0031] In the embodiment, the first friction disc 4 is rotatably installed on the outer shell 3, and the second friction disc 5 is in the state of axial locking with the outer shell 3, specifically, the side of the second friction disc 5 facing the spiral feeding device 2 is provided with an extension pipe, the extension pipe extends into the discharge pipe of the spiral feeding device 2, and the extension pipe is provided with a limiting groove along the length direction, the limiting groove is matched with the limiting block arranged in the discharge pipe of the spiral feeding device 2, and the extension pipe can be axially relative to the discharge pipe in a certain state and the two are in the state of relative axial locking, so that the position of the second friction disc 5 can be adjusted, and the gap between the first friction disc 4 and the second friction disc 5 is adjustable to meet different production requirements.

[0032] Further, the friction planes 401 on the first friction disc 4 and the second friction disc 5 are concentrically arranged, and the distance between the two groups of friction planes 401 arranged oppositely is smaller as being closer to the edge of the first friction disc 4 and the second friction disc 5, which makes the material enter the larger space formed between the two centers when the spiral feeding device 2 delivers the material to the first friction disc 4 and the second friction disc 5, and then the material can enter the outer friction planes 401 through the material guiding slope 402 as the first friction disc 4 rotates, and the distance between the two groups of outer friction planes 401 is smaller, so that the friction between the materials is intensified, and the materials also move towards the edge of the first friction disc 4 and the second friction disc 5 as the materials move, so that the materials are subjected to more intense friction under the action of the two groups of friction planes 401 with smaller gap, so that the materials are sufficiently heat melted.

[0033] Based on the above setting, the material can gradually increase the friction in the process of movement, so that the material can produce the effect of gradual hot melting, which improves the hot melting effect of the material to a certain extent, prevents the hot melting material from wrapping the non-hot melting material and moving to cause the local material to be completely hot melting, and enables the material to be bound between the first friction disc 4 and the second friction disc 5 during the initial process of entering the first friction disc 4 and the second friction disc 5. Compared with the existing flat plate friction disc, the application effectively avoids the situation that the material slides on the first friction disc 4 and the second friction disc 5 to cause the local material to be unable to hot melt.

[0034] Please refer to Figures 2-4 、 Figures 6-8 , the adjusting mechanism is arranged on the outer shell 3 connected to the second friction disc 5, and the adjusting mechanism can adjust the gap and pressure between the first friction disc 4 and the second friction disc 5. Specifically, the adjusting mechanism comprises: an elastic component connected to the second friction disc 5 and penetrating the outer shell 3; a threaded propulsion component connected to the elastic component, which can store or release elastic potential energy when in action; an annular support 19 fixedly installed on the outer shell 3, a plurality of groove wheels 20 are circumferentially and equidistantly arranged on the annular support 19, a plurality of the groove wheels 20 are arranged between the tooth ring 8, the tooth ring 8 is limited by the plurality of groove wheels 20 to ensure that the tooth ring 8 can be fully engaged with the gear 9, the tooth ring 8 is engaged with the gear 9 connected to the threaded propulsion component, and the tooth ring 8 is connected to the driving device 7 arranged on the screw feeding device 2; the elastic component comprises a containment sleeve 15 connected to the second friction disc 5 and penetrating the outer shell 3, an abutment plate 13 is slidably installed in the containment sleeve 15, a connecting shaft 12 penetrating the containment sleeve 15 is arranged on the abutment plate 13, and the cross section of the connecting shaft 12 is square; a cylindrical spring 14 is further arranged in the containment sleeve 15, one end of the cylindrical spring 14 is connected to the inner wall of the containment sleeve 15, and the other end is connected to the abutment plate 13; the threaded propulsion component comprises a threaded rod 11 fixedly connected to the connecting shaft 12, a threaded sleeve 10 threadedly connected to the threaded rod 11 is arranged on the threaded rod 11, the threaded sleeve 10 is rotationally installed on the annular support 19, and the threaded sleeve 10 is coaxially and fixedly connected with the gear 9.

[0035] In this embodiment, the gap and pressure between the first friction disc 4 and the second friction disc 5 can be adjusted according to the production needs. Specifically, by controlling the operation of the driving device 7, the gear ring 8 engaged therewith can be rotated, and the gear ring 8 is in engagement with the gear 9, so that the gear 9 will also rotate and drive the threaded sleeve 10 to rotate. The threaded sleeve 10 is rotatably installed on the annular support 19, and the cross section of the connecting shaft 12 is square, so that the connecting shaft 12 and the lag sleeve 15 can be axially locked with the threaded rod 11. In this way, during the rotation of the threaded sleeve 10, the threaded rod 11 will not rotate. Based on this arrangement, when the threaded sleeve 10 rotates, the threaded rod 11 can move along the length direction of the threaded sleeve 10, and push the cylindrical spring 14 to move through the abutting plate 13, so that the second friction disc 5 can move relative to the first friction disc 4, thereby adjusting the distance between the first friction disc 4 and the second friction disc 5.

[0036] In the initial state, the first friction disc 4 and the second friction disc 5 are in a bonded state, so that the material can be confined in the cavity formed between the two when entering therebetween. After the material is completely melted in the initial stage, the rotation of the gear ring 8 can control the compression amount of the cylindrical spring 14, so that the friction force pressure can be adjusted according to different materials, and the applicability of the device when rubbing materials of different materials is ensured.

[0037] Please refer to Figures 4-6 , Figure 9 , the scraping piece 6 is arranged in the scraping piece 6, and the scraping piece 6 is used for scraping the adhered molten material in the outer shell 3. A plurality of groups of hollow grooves 601 are circumferentially and equidistantly arranged on the scraping piece 6, and a material scraping inclined surface 602 is arranged on one side of the hollow groove 601. A plurality of groups of lag grooves 603 are also circumferentially and equidistantly arranged on the scraping piece 6, and the extension rod 17 is slidingly arranged in the lag groove 603. The extension rod 17 is connected to the second friction disc 5, and the end of the extension rod 17 is provided with an abutting portion 1701 which cooperates with the protruding portion 18 arranged on the side of the first friction disc 4, so that the scraping piece 6 can be rotated when the gap between the first friction disc 4 and the second friction disc 5 is less than a predetermined value. The side of the second friction disc 5 is rotatably sleeved with a follow-up ring 16, and the side of the follow-up ring 16 is circumferentially and equidistantly provided with an embedded portion 1601 which is adapted to the hollow groove 601. When the second friction disc 5 moves, the follow-up ring 16 connected thereto will also move. At this time, since the embedded portion 1601 is adapted to the hollow groove 601, the side of the scraping piece 6 facing the second friction disc 5 can be blocked, so as to prevent the molten material from entering the space on the side of the second friction disc 5 away from the first friction disc 4.

[0038] The extension rod 17 is fixedly connected with the follow-up ring 16, and an inclined shovel part is arranged at an end of the extension rod 17 away from the follow-up ring 16, and when the follow-up ring 16 moves towards the first friction disc 4 following the second friction disc 5, the inclined shovel part can shovel out the material in the holding groove 603.

[0039] In the initial state, the abutting part 1701 on the extension rod 17 is in a misaligned state with the protruding part 18, at this time, when the first friction disc 4 rotates, only the first friction disc 4 rotates, and the scraping member 6 is in a static state, in this state, the gap between the first friction disc 4 and the second friction disc 5 is large, the temperature generated by the friction of the material is low, and the inner wall of the outer shell 3 will not be high-temperature, and the material will not adhere to the inner wall of the outer shell 3, in this case, the scraping member 6 will not rotate with the first friction disc 4, thereby reducing the friction resistance of the first friction disc 4 when rotating.

[0040] When the gap between the first friction disc 4 and the second friction disc 5 is reduced according to the production needs, the temperature generated by the friction of the material will rise, at this time, the temperature of the inner wall of the outer shell 3 will also rise, in this state, the material will adhere to the inner wall of the outer shell 3, and in this state, the abutting part 1701 on the extension rod 17 is in a coincident state with the protruding part 18, so that when the first friction disc 4 rotates, the abutting part 1701 can drive the extension rod 17 to rotate, and the extension rod 17 is arranged inside the holding groove 603, so that the scraping member 6 will rotate, and the material adhered to the inner wall of the outer shell 3 is scraped by the material scraping slope 602, to prevent the "wall sticking risk".

[0041] Through the above arrangement, when the material of different materials is frictionally hot-melted, the scraping member 6 can be selectively driven to rotate according to the distance between the first friction disc 4 and the second friction disc 5, so that when the inner wall of the outer shell 3 is low-temperature and the wall sticking does not occur, the scraping member 6 does not rotate with the first friction disc 4, thereby reducing the rotating resistance of the first friction disc 4, preventing the external driving motor from being overloaded, and when the inner wall of the outer shell 3 is high-temperature and causes wall sticking, the scraping member 6 can rotate with the first friction disc 4 to scrape the material adhered to the inner wall of the outer shell 3, to prevent the "wall sticking risk".

[0042] It should be noted that in the case that the inner wall of the outer shell 3 is high-temperature, the hot-melt temperature of the material is also relatively high, at this time, the flowability of the material is relatively high, so that even in this case, the load increased by the rotation of the scraping member 6 is relatively small.

[0043] As an embodiment of the present application, a process for regenerating the slice is also proposed, comprising the following steps: the raw material is crushed by a crusher and then conveyed to the above-mentioned extrusion friction granulation device, the material generated by friction granulation is sucked into four large material tanks by a suction machine for storage, then the raw material is mixed by a mixer and conveyed to a drying tower for drying treatment, after drying, the injection strip is extruded by a double screw extruder under vacuum and cooled, and finally the injection strip is cut by a granulator.

[0044] The regenerated slice produced by the above production steps can make products that are black and bright from the basic mixed color material without using black masterbatch, which is darker and brighter than all the regenerated slices on the market, does not use black masterbatch, and is more cost-saving.

[0045] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of the equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0046] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. An extrusion frictional massing device comprising: The base is provided with a spiral feeding device and a disc friction device; The disc friction device comprises: An outer shell connected with the spiral feeding device, the outer shell is provided with a first friction disc and a second friction disc arranged oppositely, the first friction disc and the second friction disc are matched to heat melt the material entering the outer shell; A scraping member arranged in the outer shell, the scraping member is used for scraping the molten material adhered in the outer shell; An adjusting mechanism arranged on the outer shell and connected with the second friction disc, the adjusting mechanism is capable of adjusting the gap and pressure between the first friction disc and the second friction disc; An extension rod connected with the second friction disc, an end of the extension rod is provided with an abutting portion matched with a protruding portion arranged on the side of the first friction disc, the abutting portion is capable of rotating the scraping member when the gap between the first friction disc and the second friction disc is less than a preset value; The adjusting mechanism comprises: An elastic assembly connected with the second friction disc and penetrating through the outer shell; A threaded advancing assembly connected with the elastic assembly, the threaded advancing assembly is capable of storing or releasing elastic potential energy of the elastic assembly when in action; A ring-shaped support fixedly installed on the outer shell, a plurality of sets of grooved wheels are arranged on the ring-shaped support at equal intervals in a circumferential direction, a plurality of sets of the grooved wheels are provided with a tooth ring, the tooth ring is engaged with a gear connected with the threaded advancing assembly, and the tooth ring is connected with a driving device arranged on the spiral feeding device; A plurality of sets of hollow grooves are arranged on the scraping member at equal intervals in a circumferential direction, one side of the hollow groove is provided with a material scraping inclined surface; A plurality of sets of material retaining grooves are also arranged on the scraping member at equal intervals in a circumferential direction, the extension rod is slidingly arranged in the material retaining groove; A follower ring is rotatably arranged on the side of the second friction disc, the side of the follower ring is arranged with a plurality of sets of embedded portions matched with the hollow grooves at equal intervals in a circumferential direction; The extension rod is fixedly connected with the follower ring.

2. A squeeze-type friction particle agglomerator according to claim 1, wherein The first friction disc is rotatably installed in the outer shell; The first friction disc and the second friction disc are provided with a plurality of sets of friction planes on opposite sides, the plurality of sets of friction planes are connected through an annular material guiding inclined surface, and the first friction disc and the second friction disc are provided with protrusions; In the radial direction of the first friction disc, the gap between the plurality of sets of friction planes on the first friction disc and the second friction disc gradually increases or decreases.

3. A device according to claim 1, wherein The elastic assembly comprises a material retaining sleeve connected with the second friction disc and penetrating through the outer shell, an abutting plate is slidingly installed in the material retaining sleeve, the abutting plate is provided with a connecting shaft penetrating through the material retaining sleeve, and the cross section of the connecting shaft is square; The material retaining sleeve is also provided with a cylindrical spring, one end of the cylindrical spring is connected with the inner wall of the material retaining sleeve, and the other end is connected with the abutting plate.

4. A squeeze-type friction particle agglomerator according to claim 3, wherein The threaded advancing assembly comprises a threaded rod fixedly connected with the connecting shaft, the threaded rod is provided with a threaded sleeve threadedly connected therewith, the threaded sleeve is rotatably installed on the ring-shaped support, and the threaded sleeve is coaxially and fixedly connected with the gear.

5. A device according to claim 1, wherein The extending rod is provided with a bevel shovel part at one end away from the follow-up ring, which can shovel out the material in the holding groove when the follow-up ring moves towards the first friction disc following the second friction disc.

6. A process for regenerating a slice, characterized in that, The method comprises the following steps: The raw material is crushed by a crusher and then conveyed into the extrusion friction pelletizing device according to any one of claims 1-5, the material generated by friction pelletizing is sucked into a material tank by a suction machine for storage, then a mixer mixes the raw material and conveys it into a drying tower for drying treatment, after drying, the injection band is extruded by a double screw extruder under vacuum and cooled into an injection band strip, and finally the injection band strip is cut by a pelletizer.

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