Plastic resin sample preparation equipment disassembly-free cleaning device and cleaning method

Abstract

The application relates to the technical field of plastic processing equipment maintenance, and specifically discloses a plastic resin sample preparation equipment disassembly-free cleaning device and cleaning method, which comprises a mounting rack, an extrusion mixing device, a hard abrasive storage tank and a carrier resin storage tank, the hard abrasive storage tank stores corundum, silicon carbide or zirconium oxide, and the carrier resin storage tank stores low-density polyethylene, ethylene-vinyl acetate copolymer or polystyrene. The extrusion mixing device comprises a heating mixing cavity, a flexible mixing container and a swing extrusion component, the heating mixing cavity provides a carrier resin preliminary melting temperature, and the swing extrusion component periodically extrudes the flexible mixing container, so that the hard abrasive is uniformly mixed with the preliminarily melted carrier resin to form a composite cleaning material. The preparation and direct conveying of the cleaning material are realized, the flexible container swing extrusion is adopted to realize uniform mixing without dead angles, efficient cleaning can be completed without disassembling the core components of the extruder, the equipment maintenance time is greatly shortened, and the damage of disassembly to the equipment precision is avoided.

Description

Technical Field

[0001] This application relates to the field of plastic processing equipment maintenance technology, and in particular to a non-disassembly cleaning device and cleaning method for plastic resin sample preparation equipment. Background Technology

[0002] During the research and development and production of plastic resins, thermoplastic resins are prone to degradation, cross-linking and carbonization under high-temperature processing conditions, which can form stubborn residues that are difficult to remove from the screw, barrel inner wall and die flow channel of small precision extruders.

[0003] Currently, the industry mainly uses a disassembly and cleaning method: after the machine is stopped and cooled, the machine head, flange, and screw are disassembled in sequence, and carbon deposits are manually scraped off using tools such as copper brushes and scrapers. This method has many fatal flaws: First, the downtime is extremely long. A single cleaning usually takes more than 4 hours, and after reassembly, precision calibration is required, resulting in an overall downtime of more than 6 hours, which seriously affects R&D and production efficiency. Secondly, the tools can easily damage the equipment. They can easily scratch the chrome plating on the screw surface and the precision mating surfaces, leading to a decrease in equipment accuracy and a shortened service life. Third, there are significant safety hazards. Operators need to come into contact with high-temperature components and heavy parts, which can easily lead to burns and crushing accidents.

[0004] In addition, chemical cleaning agents are highly corrosive to the metal parts of the equipment, and the waste liquid is hazardous waste, which is costly to treat and easily causes environmental pollution. The material replacement and ejection method can only remove loose residues and is extremely inefficient for carbonized stubborn deposits. It is also very ineffective when switching from dark resin to light resin and requires several times the amount of new resin raw materials compared to normal production.

[0005] The aforementioned problems have long constrained the maintenance efficiency and operating costs of plastic sample preparation equipment, thus necessitating the development of a highly efficient cleaning solution that does not require disassembly of the main equipment structure. Summary of the Invention

[0006] This application provides a non-disassembly cleaning device for plastic resin sample preparation equipment, which solves the technical problems of long downtime and equipment damage caused by the need to disassemble the extruder for cleaning, as well as the cumbersome process of external premixed cleaning materials and the existence of dead zones and uneven mixing. It realizes the in-situ preparation and direct transportation of cleaning materials, and uses flexible container swing extrusion to achieve uniform mixing without dead zones. It can complete efficient cleaning without disassembling any core components of the extruder, which greatly shortens the equipment maintenance time and avoids damage to the equipment precision caused by disassembly.

[0007] In a first aspect, embodiments of the present invention provide a non-disassembly cleaning device for plastic resin sample preparation equipment, comprising: a mounting frame, having a multi-layer frame structure, and mounted on one side of the extruder inlet; an extrusion mixing device, mounted on the mounting frame, with its output port mounted on the upper part of the extruder; a hard abrasive storage tank and a carrier resin storage tank, respectively mounted on the mounting frame, and both connected to the inlet of the extrusion mixing device via a negative pressure conveying unit; wherein the hard abrasive storage tank is used to store hard inorganic abrasive, which is one or more of corundum, silicon carbide, and zirconium oxide; the carrier resin storage tank is used to store thermoplastic carrier resin, and... The thermoplastic carrier resin is selected from at least one of low-density polyethylene, ethylene-vinyl acetate copolymer, and polystyrene; the extrusion mixing device includes: a heated mixing chamber, a flexible mixing container disposed in the heated mixing chamber, and a swinging extrusion member disposed corresponding to the flexible mixing container; the heated mixing chamber is used to provide a temperature for initial melting of the carrier resin; the swinging extrusion member is used to periodically extrude the flexible mixing container, so that the hard abrasive and the initially melted carrier resin are uniformly mixed in the flexible mixing container to form a composite cleaning material; the composite cleaning material is a uniform mixture of hard inorganic abrasive and thermoplastic carrier resin.

[0008] In one possible implementation, the extrusion mixing device further includes: a drive unit, with its top end mounted on the mounting frame and its bottom end connected to the oscillating extrusion member; wherein the drive unit is used to drive the oscillating extrusion member to oscillate conically around the central axis of the flexible mixing container; the drive unit includes: a linear drive unit, vertically arranged, with a mounting base connected to the mounting frame; and a drive motor, with its top end connected to the telescopic end of the linear drive unit and its bottom end connected to the oscillating extrusion member.

[0009] In one possible implementation, the oscillating extrusion component includes: a drive rod, with its top end connected to the drive motor and its bottom end passing through the heating and mixing chamber; a rotating cup with its opening facing downwards and its bottom connected to the drive rod; a liquid-filled elastic drive bladder with its inlet connected to the bottom end of the drive rod; wherein the drive rod near the liquid-filled elastic drive bladder has a hollow tubular structure, and the liquid-filled elastic drive bladder communicates with the bottom end of the drive rod; the drive rod near the drive motor has an inlet, one end of which communicates with the interior of the drive rod; a water supply pipe, one end of which is rotary sealed to the drive rod near the inlet, and the other end of which is connected to a liquid supply device; a limiting baffle, located on one side of the liquid-filled elastic drive bladder, with its top end installed on the bottom surface of the rotating cup; and a swinging part on the side of the liquid-filled elastic drive bladder away from the limiting baffle, wherein the liquid-filled elastic drive bladder, after being inflated with liquid, is used to push the swinging part to move.

[0010] In one possible implementation, the swinging part includes: a limiting plate, horizontally installed in the bottom opening of the rotating cup; a strip-shaped hole, formed on the surface of the limiting plate; a swinging shaft, one end of which passes through the strip-shaped hole and is located on the side of the liquid-filled elastic drive bladder away from the limiting baffle; a tension spring, one end of which is installed on the side of the strip-shaped hole near the limiting baffle, and the other end of which is connected to the outer wall of the swinging shaft; a circular pressure plate, located at the lower part of the swinging shaft, and the bottom end of the swinging shaft is coaxially connected to the surface of the circular pressure plate; wherein the end of the swinging shaft near the circular pressure plate forms a tapered expansion section, the diameter of which gradually increases in the direction toward the circular pressure plate; a slot is formed at the bottom end of the limiting baffle and the middle position of the strip-shaped hole, and after the liquid-filled elastic drive bladder drains liquid, the tension spring pulls the swinging shaft into the slot, which is used by the linear drive unit to push the circular pressure plate to squeeze the flexible mixing container.

[0011] In one possible implementation, the oscillating extrusion component further includes: an elastic guide support unit disposed within the heating and mixing chamber; wherein the elastic guide support unit includes: a telescopic sleeve, at least two sets of which are symmetrically arranged about the axis of the heating and mixing chamber, with their top ends connected to the inner top surface of the heating and mixing chamber; guide contacts, corresponding one-to-one with the number of telescopic sleeves and respectively connected to the bottom end of the telescopic sleeve, the bottom end being conical and abutting against the surface of the circular pressure plate; and springs, corresponding one-to-one with the number of telescopic sleeves and respectively disposed within the telescopic sleeves, one end connected to the top surface of the guide contacts and the other end connected to the inner top surface of the heating and mixing chamber.

[0012] In one possible implementation, the oscillating extrusion component further includes: a liquid-filled deformable support platform, which is disposed within the heating and mixing chamber and coaxially arranged with the rotating cup body; the liquid-filled deformable support platform includes: a cup-shaped base, installed at the bottom end of the heating and mixing chamber, with its edge sealed to the inner wall of the bottom end of the heating and mixing chamber; an elastic cone apex, the bottom opening of which is connected to the top opening of the cup-shaped base; spokes, spaced apart, the spokes all radiating outwards from the top of the elastic cone apex on the inner wall of the elastic cone apex; and a support platform, coaxially arranged within the cup-shaped base, for supporting the elastic cone apex after the liquid-filled deformable support platform discharges liquid; The fluid-filled deformable support pipe is connected to the fluid supply equipment; the flexible mixing container is integrally molded from peroxide-cured fluororubber, with a flat, round, sac-like structure, its edges are rounded, and its upper and lower surfaces are symmetrical arc-shaped curved surfaces, located between the circular pressure plate and the elastic cone top; a feed pipe is provided on one side of the flexible mixing container, one end of which connects to the interior of the flexible mixing container, and the other end passes through the heating mixing chamber and is connected to the hard abrasive storage tank and the carrier resin storage tank respectively; a discharge pipe is also provided on the other side of the flexible mixing container, one end of which connects to the interior of the flexible mixing container, and the other end passes through the heating mixing chamber and is connected to a solenoid valve, which is arranged at the feed inlet of the extruder.

[0013] On the other hand, embodiments of the present invention also provide a cleaning method, comprising the following steps: S1, feeding hard inorganic abrasive and thermoplastic carrier resin into the flexible mixing container of a swing extrusion premixing device via a negative pressure conveying unit, heating the mixing chamber to 70°C~120°C to initially soften and melt the carrier resin, and periodically extruding the flexible mixing container with the swing extrusion component to uniformly mix the hard abrasive and the initially softened and melted carrier resin to form a composite cleaning material; S2, heating the plastic resin sample preparation equipment to be cleaned to the melting processing temperature of the carrier resin, maintaining... The temperature inside the barrel is maintained at 180℃~280℃; S3, start the screw of the extruder and feed the composite cleaning material directly into the barrel from the oscillating extrusion premixing device in low-speed operation mode. Under the shearing action of the screw and the friction of the inner wall of the barrel, the composite cleaning material uses hard abrasive to grind and peel off the cured resin adhering to the metal surface; S4, after cleaning and circulating for 10~30 minutes, reduce the screw speed and discharge the waste residue and residual composite cleaning material; S5, introduce new resin raw material for production into the barrel to replace the residual composite cleaning material in the barrel until the extrudate is free of black spots and impurities.

[0014] In one possible implementation, in step S1, the hard inorganic abrasive has a particle size of 80~300μm and is surface modified with a silane coupling agent; the melt flow rate of the thermoplastic carrier resin is 5~50g / 10min; and the mass ratio of the hard inorganic abrasive to the thermoplastic carrier resin is 1:1~1:5.

[0015] In one possible implementation, in step S3, the screw speed in the low-speed operation mode is controlled at 10~30 rpm; for plastic resin sample preparation equipment with a length-to-diameter ratio greater than 30, the cleaning time is not less than 20 minutes.

[0016] In one possible implementation, an auxiliary purging step is included after step S4: high-pressure compressed air or inert gas is introduced into the barrel to purge the residual fine abrasive powder.

[0017] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: To address the core issues of existing extruder cleaning systems, such as the need for disassembly and the potential for contamination and uneven mixing of externally premixed cleaning materials, an in-situ integrated, non-disassembly-required cleaning system has been developed. The mounting frame employs a multi-layered frame structure, fixing the hard abrasive storage tank, carrier resin storage tank, and extrusion mixing device layer by layer from top to bottom. The entire system is hoisted directly above the extruder inlet, requiring no modifications to the original extruder structure. The hard abrasive storage tank contains sealed corundum, silicon carbide, or zirconium oxide particles, while the carrier resin storage tank contains sealed low-density polyethylene, ethylene-vinyl acetate copolymer, or polystyrene particles. The outlets of both tanks are connected to the inlet of a negative pressure conveying unit via independent pipelines. Upon activation, the negative pressure conveying unit generates a stable negative pressure, simultaneously extracting and conveying the two materials in a preset ratio to a flexible mixing container within the heated mixing chamber. The electric heating element in the heating mixing chamber generates heat, uniformly raising the air temperature inside the chamber to 70℃~120℃. This heat, through heat transfer, gradually softens the carrier resin within the flexible mixing container, achieving a semi-solid, viscous flow state capable of adhering to and encapsulating abrasive particles. Driven by a power source, the oscillating extrusion component performs periodic oscillating extrusion movements around the central axis of the flexible mixing container. Each extrusion causes localized deformation of the flexible mixing container, forcing the internal material to flow from the pressurized area to the unpressurized area, creating omnidirectional tumbling, shearing, and convection motion. This allows the hard abrasive particles to be uniformly embedded in the semi-solid carrier resin, ultimately forming a homogeneous and stable composite cleaning material.

[0018] This method solves the technical challenge of traditional cleaning methods requiring the disassembly of the extruder screw, die head, and barrel. It completely avoids scratches and impact damage to the precision mating surfaces and chrome plating of the screw during disassembly, significantly reducing downtime for cleaning. It enables in-situ preparation and direct delivery of the cleaning material, eliminating the need for external mixing and transfer, thus reducing material loss and environmental pollution. The flexible container oscillating extrusion mixing method completely eliminates the mixing dead zones present in traditional rigid agitators, ensuring the uniformity of the composite cleaning material and providing a reliable guarantee for efficient cleaning of the extruder's internal channels and dead zones. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the cleaning device structure provided in the embodiments of this application; Figure 2 This is a schematic diagram of the heating and mixing chamber structure provided in an embodiment of this application; Figure 3 This is a schematic diagram of the drive unit structure provided in an embodiment of this application; Figure 4 This is a schematic diagram of the elastic guide support unit structure provided in the embodiments of this application; Figure 5 This is a schematic diagram of the swinging part structure provided in an embodiment of this application; Figure 6 This is a schematic diagram of a flexible hybrid container structure provided in an embodiment of this application; Figure 7 This is a schematic diagram of a liquid-filled deformable support structure provided in an embodiment of this application; Figure 8 A flowchart illustrating the cleaning method provided in this application embodiment.

[0021] icon: 100 - Mounting rack; 200-Extruder; 300 - Hard abrasive storage tank; 400 - Carrier resin storage tank; 500 - Heated mixing chamber; 600 - Flexible mixing container; 700-Oscillating extrusion component; 710-Drive rod; 720-Rotating cup body; 730-Liquid-filled elastic drive bladder; 740-Water supply pipe; 750-Limit baffle; 760-Swinging section; 761-Limiting plate; 762-Strip hole; 763-Swing shaft; 764-Tension spring; 765-Circular pressure plate; 766-Slot; 770 - Flexible Guided Support Unit; 771-Telescopic sleeve; 772-Guide contact block; 773-Spring; 780 - Liquid-filled deformable bearing platform; 781-Cup-shaped base; 782-Elastic cone top; 783-Spokes; 784-Support platform; 785-Feed tube; 786-Discharge tube; 800-Drive Unit; 810 - Linear drive unit; 820 - Drive motor. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0024] Example 1 Please see Figures 1-8A non-disassembly cleaning device for plastic resin sample preparation equipment includes: a mounting frame 100, which has a multi-layer frame structure and is installed on one side of the feed inlet of an extruder 200; an extrusion mixing device installed on the mounting frame 100, with its output port mounted on the upper part of the extruder 200; a hard abrasive storage tank 300 and a carrier resin storage tank 400, respectively installed on the mounting frame 100 and connected to the feed inlet of the extrusion mixing device via a negative pressure conveying unit; wherein the hard abrasive storage tank 300 is used to store hard inorganic abrasive, which is one or more of corundum, silicon carbide, and zirconium oxide; the carrier resin storage tank 400 is used to store thermoplastic carrier resin, which is... The resin is selected from at least one of low-density polyethylene, ethylene-vinyl acetate copolymer, and polystyrene; the extrusion mixing device includes: a heated mixing chamber 500, a flexible mixing container 600 disposed within the heated mixing chamber 500, and a swinging extrusion member 700 corresponding to the flexible mixing container 600; the heated mixing chamber 500 is used to provide a temperature for initial melting of the carrier resin; the swinging extrusion member 700 is used to periodically extrude the flexible mixing container 600, so that the hard abrasive and the initially melted carrier resin are uniformly mixed within the flexible mixing container 600 to form a composite cleaning material; the composite cleaning material is a uniform mixture of hard inorganic abrasive and thermoplastic carrier resin.

[0025] In the above embodiments, addressing the core issues of existing extruders 200 requiring disassembly for cleaning and the easy contamination and uneven mixing of external premixed cleaning materials, an in-situ integrated cleaning system that does not require disassembly was constructed. The mounting frame 100 adopts a multi-layered frame structure, fixing the hard abrasive storage tank 300, carrier resin storage tank 400, and extrusion mixing device layer by layer from top to bottom. The entire system is hoisted directly above the feed inlet of the extruder 200, requiring no modification to the original structure of the extruder 200. The hard abrasive storage tank 300 contains sealed corundum, silicon carbide, or zirconium oxide particles, while the carrier resin storage tank 400 contains sealed low-density polyethylene, ethylene-vinyl acetate copolymer, or polystyrene particles. The outlets of the two tanks are connected to the feed end of the negative pressure conveying unit via independent pipelines. After the negative pressure conveying unit is activated, it generates a stable negative pressure, simultaneously extracting and conveying the two materials in a preset ratio to the flexible mixing container 600 within the heated mixing chamber 500. The electric heating element of the heating mixing chamber 500 is energized and heats up, uniformly raising the air temperature inside the chamber to 70℃~120℃. The heat, through heat transfer, gradually softens the carrier resin inside the flexible mixing container 600, reaching a semi-solid viscous flow state where it can adhere to and encapsulate abrasive particles. Driven by power, the oscillating extrusion component 700 performs periodic oscillating extrusion movements with the central axis of the flexible mixing container 600 as a reference. Each extrusion causes local deformation of the flexible mixing container 600, forcing the internal material to flow from the pressurized area to the unpressurized area, forming a full-range tumbling, shearing, and convection motion. This allows the hard abrasive particles to be uniformly embedded in the semi-solid carrier resin, ultimately forming a homogeneous and stable composite cleaning material.

[0026] This method solves the technical challenge of traditional cleaning methods requiring the disassembly of the extruder 200 screw, die head, and barrel. It completely avoids scratches and impact damage to the precision mating surfaces and chrome plating of the screw during disassembly, significantly reducing downtime for cleaning. It enables in-situ preparation and direct delivery of the cleaning material, eliminating the need for external mixing and transfer, thus reducing material loss and environmental pollution. The flexible container oscillating extrusion mixing method completely eliminates the mixing dead zones present in traditional rigid agitators, ensuring the uniformity of the composite cleaning material and providing a reliable guarantee for efficient cleaning of the internal flow channels and dead zones of the extruder 200.

[0027] Example 2 Please see Figures 1-8The extrusion mixing device further includes: a drive unit 800, with its top end mounted on the mounting frame 100 and its bottom end connected to the oscillating extrusion member 700; wherein the drive unit 800 is used to drive the oscillating extrusion member to oscillate conically around the central axis of the flexible mixing container 600; the drive unit 800 includes: a linear drive unit 810, vertically arranged, with its mounting base connected to the mounting frame 100; and a drive motor 820, with its top end connected to the telescopic end of the linear drive unit 810 and its bottom end connected to the oscillating extrusion member.

[0028] In the above embodiment, the drive motor 820 provides rotational power, and its output shaft drives the oscillating extrusion component 700 to rotate around its central axis. The linear drive unit 810 is arranged vertically, with its mounting base fixedly connected to the mounting frame 100, and its telescopic end fixedly connected to the housing of the drive motor 820, enabling it to drive the drive motor 820 and the entire oscillating extrusion component 700 to perform vertical reciprocating motion. The linear drive unit 810 can be flexibly selected from any one of electric telescopic rod, pneumatic cylinder, or hydraulic cylinder according to actual working conditions. Different types of linear drive units 810 can adjust the swing amplitude of the oscillating extrusion component 700 by controlling the telescopic amount. When the linear drive unit 810 performs periodic telescopic motion, it will cause the output shaft of the drive motor 820 to tilt, thereby causing the bottom end of the oscillating extrusion component 700 to perform conical oscillating motion around its central axis, realizing alternating extrusion of different parts of the flexible mixing container 600.

[0029] Through the coordinated operation of the drive motor 820 and the linear drive unit 810, precise control of the conical oscillation motion of the oscillating extrusion component 700 is achieved, ensuring that the extrusion force is evenly applied to all parts of the flexible mixing container 600, further improving the mixing effect. The linear drive unit 810 adopts a modular design, which can be flexibly replaced according to different application scenarios and power requirements, reducing the manufacturing cost and maintenance difficulty of the device. Compared with traditional linear extrusion, the conical oscillation motion can generate a more complex three-dimensional flow state of materials, resulting in higher mixing efficiency and shorter mixing time.

[0030] Example 3 Please see Figures 1-8The oscillating extrusion component includes: a drive rod 710, with its top end connected to the drive motor 820 and its bottom end passing through the heating and mixing chamber 500; a rotating cup 720, with its opening facing downwards and its bottom connected to the drive rod 710; and a liquid-filled elastic drive bladder 730, with its inlet connected to the bottom end of the drive rod 710; wherein the end of the drive rod 710 near the liquid-filled elastic drive bladder 730 has a hollow tubular structure, and the liquid-filled elastic drive bladder 730 communicates with the bottom end of the drive rod 710; the drive rod 710 near the drive motor 820... One end of the motor 820 has an inlet, which is connected to the inside of the drive rod 710; one end of the water supply pipe 740 is rotary sealed to the drive rod 710 near the inlet, and the other end is connected to the liquid supply device; a limiting baffle 750 is provided on one side of the liquid-filled elastic drive bladder 730, and its top end is installed on the inner bottom surface of the rotating cup body 720; a swing part 760 is provided on the side of the liquid-filled elastic drive bladder 730 away from the limiting baffle 750, and the liquid-filled elastic drive bladder 730 is used to push the swing part 760 to move after it is filled with liquid and expanded.

[0031] In the above embodiments, The rotating cup 720 is a cylindrical structure with its opening facing downwards. Its bottom center is fixedly connected to the bottom end of the drive rod 710, and it rotates together with the drive rod 710. The drive rod 710 is a hollow tube structure with a radial liquid inlet at its end near the drive motor 820. One end of the water supply pipe 740 is connected to this liquid inlet via a rotary sealing joint, and the other end is connected to an external liquid supply device. The bottom opening of the drive rod 710 is sealed to the liquid inlet of the liquid-filled elastic drive bladder 730. The limiting baffle 750 is a vertically arranged flat plate structure, with its top fixed to the inner bottom surface of the rotating cup 720, located on one side of the liquid-filled elastic drive bladder 730. When the liquid supply device supplies liquid into the drive rod 710 through the water supply pipe 740, the liquid flows into the liquid-filled elastic drive bladder 730 along the hollow channel of the drive rod 710, causing the liquid-filled elastic drive bladder 730 to gradually expand. Because the limiting baffle 750 blocks the expansion and deformation of the liquid-filled elastic drive bladder 730 to one side, it forces the liquid-filled elastic drive bladder 730 to expand directionally to the side away from the limiting baffle 750, thereby pushing the swing part 760 to produce displacement.

[0032] A liquid-filled elastic drive capsule 730 is used as the power transmission component. Utilizing the incompressibility of liquid, power can be evenly transmitted to all parts of the swing section 760, avoiding the impact and vibration problems associated with rigid transmission. The liquid-filled drive method allows for stepless adjustment; the displacement and tilt angle of the swing section 760 can be precisely controlled by adjusting the amount of liquid, resulting in high adjustment accuracy. The entire drive structure is compact and occupies little space, effectively utilizing the limited space inside the rotating cup 720, making the overall device structure more compact.

[0033] Example 4 Please see Figures 1-8 The swinging part 760 includes: a limiting plate 761, horizontally installed in the bottom opening of the rotating cup body 720; a strip-shaped hole 762, formed on the surface of the limiting plate 761; a swinging shaft 763, one end of which passes through the strip-shaped hole 762 and is located on the side of the liquid-filled elastic drive bladder 730 away from the limiting baffle 750; a tension spring 764, one end of which is installed on the side of the strip-shaped hole 762 near the limiting baffle 750, and the other end is connected to the outer wall of the swinging shaft 763; and a circular pressure plate 765, located at the lower part of the swinging shaft 763. The bottom end is coaxially connected to the surface of the circular pressure plate 765; wherein the end of the swing shaft 763 near the circular pressure plate 765 forms a tapered expansion section, the diameter of which gradually increases in the direction toward the circular pressure plate 765; the bottom end of the limiting baffle 750 and the middle position of the strip hole 762 are both provided with slots 766. After the liquid-filled elastic drive bladder 730 drains the liquid, the tension spring 764 pulls the swing shaft 763 into the slots 766, so that the linear drive unit 810 can push the circular pressure plate 765 to squeeze the flexible mixing container 600.

[0034] In the above embodiment, the upper end of the swing shaft 763 extends into the rotating cup body 720 through the strip hole 762, located on the side of the liquid-filled elastic drive bladder 730 away from the limiting baffle 750; the lower end is coaxially and fixedly connected to the center of the upper surface of the circular pressure plate 765. One end of the tension spring 764 is fixed to the inner wall of the strip hole 762 near the limiting baffle 750, and the other end is fixed to the outer wall of the swing shaft 763. When the liquid-filled elastic drive bladder 730 expands, it pushes the swing shaft 763 to slide along the strip hole 762 away from the limiting baffle 750, causing the swing shaft 763 to tilt the circular pressure plate 765, while the tension spring 764 is stretched to store elastic potential energy. When the fluid-filled elastic drive bladder 730 contracts and discharges fluid, the tension spring 764 releases its elastic potential energy, pulling the swing shaft 763 along the strip hole 762 towards the limiting baffle 750, thus restoring the swing shaft 763 and the circular pressure plate 765 to a vertical position. At this time, the upper end of the swing shaft 763 engages with the groove 766 at the bottom of the limiting baffle 750 and the middle of the strip hole 762, achieving precise positioning and keeping the circular pressure plate 765 horizontal. The end of the swing shaft 763 near the circular pressure plate 765 forms a tapered expansion section, which increases the contact area with the circular pressure plate 765, allowing the compressive force to be distributed more evenly on the circular pressure plate 765.

[0035] The automatic adjustment and reset of the tilt angle of the swing shaft 763 is achieved through the cooperation of the strip hole 762 and the tension spring 764. The structure is simple and reliable, requiring no additional control components. The design of the slot 766 enables precise positioning of the swing shaft 763 during the discharge stage, ensuring that the circular pressure plate 765 can horizontally compress the flexible mixing container 600, resulting in more thorough discharge. The design of the tapered expansion section improves the connection strength between the swing shaft 763 and the circular pressure plate 765, preventing breakage at the connection point during long-term use and extending the service life of the components.

[0036] Example 5 Please see Figures 1-8 The swinging extrusion component further includes: an elastic guide support unit 770, disposed within the heating and mixing chamber 500; wherein the elastic guide support unit 770 includes: a telescopic sleeve 771, at least two sets of which are symmetrically arranged about the axis of the heating and mixing chamber 500, with their top ends connected to the inner top surface of the heating and mixing chamber 500; guide contacts 772, corresponding one-to-one with the telescopic sleeves 771, and respectively connected to the bottom end of the telescopic sleeves 771, with the bottom end being conical and abutting against the surface of the circular pressure plate 765; and springs 773, corresponding one-to-one with the telescopic sleeves 771, respectively disposed within the telescopic sleeves 771, with one end connected to the top surface of the guide contacts 772 and the other end connected to the inner top surface of the heating and mixing chamber 500.

[0037] In the above embodiment, the top end of the guide contact 772 is fixedly connected to the bottom end of the telescopic sleeve 771, and the bottom end is machined into a conical structure, always maintaining contact with the upper surface of the circular pressure plate 765. A spring 773 is disposed inside the telescopic sleeve 771, with one end fixedly connected to the top surface of the guide contact 772 and the other end fixedly connected to the inner top surface of the heating mixing chamber 500. When the oscillating extrusion member 700 performs a conical oscillating motion, the upper surface of the circular pressure plate 765 will periodically tilt relative to the horizontal direction, pushing the guide contacts 772 at different positions to drive the telescopic sleeve 771 to perform oscillation and extension. The spring 773 generates elastic force during the oscillation and extension process, providing continuous buffering and support for the circular pressure plate 765. Simultaneously, the two symmetrically arranged sets of elastic guide support units 770 can limit the radial offset of the circular pressure plate 765, ensuring the stability and accuracy of the conical oscillation action.

[0038] The design of the elastic guide support unit 770 effectively absorbs the vibration generated by the oscillating extrusion component 700 during movement, reducing noise during equipment operation and extending the service life of the components. The tapered design of the guide block 772 ensures a good fit with the upper surface of the circular pressure plate 765, guaranteeing the continuity of guiding and supporting functions. The elastic force of the spring 773 ensures that the guide block 772 always maintains contact with the circular pressure plate 765, preventing gaps between them from affecting the guiding effect and further improving the stability of the conical oscillation motion.

[0039] Example 6 Please see Figures 1-8 The oscillating extrusion component further includes: a liquid-filled deformable support platform 780, which is disposed within the heating and mixing chamber 500 and coaxially arranged with the rotating cup body 720; the liquid-filled deformable support platform 780 includes: a cup-shaped base 781, installed at the bottom end of the heating and mixing chamber 500, with its edge sealed to the inner wall of the bottom end of the heating and mixing chamber 500; an elastic cone 782, the bottom opening of which is connected to the top opening of the cup-shaped base 781; spokes 783, spaced apart, all of which are arranged radially from the top of the elastic cone 782 on the inner wall of the elastic cone 782; and a support platform 784, coaxially arranged within the cup-shaped base 781, used to support the elastic cone 782 after the liquid-filled deformable support platform 780 discharges liquid; the liquid-filled... The deformable support 780 is connected to the liquid supply equipment; the flexible mixing container 600 is integrally molded from peroxide-cured fluororubber, with a flat, round, sac-like structure, its edges are rounded, and its upper and lower surfaces are symmetrical arc-shaped surfaces, located between the circular pressure plate 765 and the elastic cone apex 782; one side of the flexible mixing container 600 is provided with a feed pipe 785, one end of which is connected to the interior of the flexible mixing container 600, and the other end passes through the heating mixing chamber 500 and is connected to the hard abrasive storage tank 300 and the carrier resin storage tank 400 respectively; the other side of the flexible mixing container 600 is also provided with a discharge pipe 786, one end of which is connected to the interior of the flexible mixing container 600, and the other end passes through the heating mixing chamber 500 and is connected to a solenoid valve, which is located at the feed inlet of the extruder 200.

[0040] In the above embodiment, the elastic cone 782 is a downward-facing conical flexible structure, with its bottom opening sealed to the top opening of the cup-shaped base 781, forming a closed liquid-filled cavity. Several spokes 783 are fixed to the inner wall of the elastic cone 782 in a radiating pattern, centered on the top of the cone 782. The support platform 784 is coaxially fixed to the center of the cup-shaped base 781. During the mixing stage, liquid is filled into the liquid-filled cavity of the liquid-filled deformable support platform 780, causing the elastic cone 782 to bulge upwards into a cone shape. The spokes 783 deform along with the elastic cone 782, providing uniform support and preventing excessive expansion. The flexible mixing container 600 is placed on the upper surface of the elastic cone 782, located between the circular pressure plate 765 and the elastic cone 782. After mixing, the liquid in the filling chamber is extracted. The elastic cone 782 deforms downward under its own elasticity and the gravity of the material above, eventually landing on the support platform 784 to form a flat upper surface. At this time, the linear drive unit 810 pushes the drive rod 710 and the rotating cup 720 downward, causing the horizontal circular pressure plate 765 to press down on the flexible mixing container 600, so that the composite cleaning material inside is extruded through the discharge pipe 786 and sent into the feed port of the extruder 200 through the solenoid valve.

[0041] It can present different shapes in the mixing and discharging stages to adapt to the working requirements of different stages. The conical surface in the mixing stage allows materials to gather towards the center, improving the mixing effect; the flat surface in the discharging stage can cooperate with the circular pressure plate 765 to achieve full compression of the flexible mixing container 600, making the discharging more thorough. The design of the spokes 783 improves the structural strength of the elastic cone top 782, preventing excessive deformation during filling and discharging, and extending its service life.

[0042] Example 7 Please see Figures 1-8A cleaning method includes the following steps: S1, hard inorganic abrasive and thermoplastic carrier resin are respectively fed into the flexible mixing container 600 of a swing extrusion premixing device through a negative pressure conveying unit; the heating mixing chamber 500 is heated to 70℃~120℃ to initially soften and melt the carrier resin; the swing extrusion component 700 periodically extrudes the flexible mixing container 600 to uniformly mix the hard abrasive and the initially softened and melted carrier resin to form a composite cleaning material; S2, the plastic resin sample preparation equipment to be cleaned is heated to the melting processing temperature of the carrier resin, and the temperature is maintained... The barrel temperature is 180℃~280℃; S3, start the screw of extruder 200 and feed the composite cleaning material directly into the barrel from the oscillating extrusion premixing device in low-speed operation mode. Under the shearing action of the screw and the friction of the inner wall of the barrel, the composite cleaning material uses hard abrasive to grind and peel off the cured resin adhering to the metal surface; S4, after cleaning cycle for 10~30 minutes, reduce the screw speed and discharge the waste residue and residual composite cleaning material; S5, introduce new resin raw material for production into the barrel to replace the residual composite cleaning material in the barrel until the extrudate is free of black spots and impurities.

[0043] In the above embodiment, the negative pressure conveying unit is first activated to quantitatively convey the hard inorganic abrasive and thermoplastic carrier resin from their respective storage tanks into the flexible mixing container 600. Then, the heating system of the heating mixing chamber 500 is activated to raise the temperature to 70°C~120°C, causing the carrier resin to initially soften and melt. Next, the drive unit 800 is activated, driving the oscillating extrusion component 700 to perform a conical oscillating motion, periodically extruding the flexible mixing container 600 to uniformly mix the two materials into a composite cleaning material. After mixing, the extruder 200 to be cleaned is heated to the melting processing temperature of the carrier resin, maintaining the barrel temperature at 180°C~280°C. The screw of the extruder 200 is started and operated in a low-speed mode, while simultaneously opening the solenoid valve on the discharge pipe 786 of the flexible mixing container 600 to directly feed the composite cleaning material into the barrel of the extruder 200. Under the shearing action of the screw and the friction of the inner wall of the barrel, the composite cleaning material forms a semi-solid fluid with abrasive capabilities, which uses the micro-cutting action of hard abrasives to peel off the cured resin adhering to the metal surface. After cleaning for 10-30 minutes, the screw speed is reduced, and the waste residue and residual composite cleaning material are discharged from the die of extruder 200. Finally, fresh production resin is introduced into the barrel to displace the residual composite cleaning material until the extrudate is free of black spots and impurities.

[0044] The cleaning method requires no disassembly of any core components of the extruder 200, significantly reducing downtime and improving production efficiency. The on-site preparation of composite cleaning materials ensures freshness and uniform mixing, enhancing cleaning effectiveness. The entire cleaning process is highly automated and simple to operate, reducing operator workload and avoiding contact with high-temperature components and chemical cleaning agents, thus improving operational safety.

[0045] Example 8 Please see Figures 1-8 In step S1, the particle size of the hard inorganic abrasive is 80~300μm and it has been surface modified by a silane coupling agent; the melt flow rate of the thermoplastic carrier resin is 5~50g / 10min; and the mass ratio of the hard inorganic abrasive to the thermoplastic carrier resin is 1:1~1:5.

[0046] In the above embodiments, the hard inorganic abrasive is selected with a particle size of 80~300μm. This particle size range provides sufficient grinding power without damaging the metal surface of the extruder 200. After surface modification treatment with a silane coupling agent, an organic film forms on the surface of the abrasive, significantly improving the interfacial bonding force between the abrasive and the carrier resin. This allows the abrasive particles to adhere more firmly to the carrier resin, preventing abrasive particles from falling off and agglomerating during the cleaning process. The thermoplastic carrier resin is selected with a melt flow rate of 5~50g / 10min. Resins with this melt flow rate range can reach an ideal softening and melting state at 70℃~120℃, effectively encapsulating the abrasive particles without leaking out of the gaps in the flexible mixing container 600 due to excessive fluidity. By controlling the mass ratio of the hard inorganic abrasive to the thermoplastic carrier resin to 1:1~1:5, the composite cleaning material has suitable hardness and fluidity, ensuring cleaning effectiveness while avoiding damage to the equipment.

[0047] Technical Effects: This embodiment further enhances the performance of the composite cleaning material by optimizing material parameters, enabling abrasive particles to be uniformly dispersed in the carrier resin and forming a stable grinding system. Surface modification treatment with a silane coupling agent improves the compatibility between the abrasive and the resin, reduces abrasive settling and agglomeration, and extends the stabilization time of the composite cleaning material. A suitable mass ratio ensures that the composite cleaning material possesses sufficient grinding power to thoroughly peel off stubborn cured resin, while also allowing for smooth flow within the barrel, guaranteeing a successful cleaning process.

[0048] Example 9 Please see Figures 1-8 In step S3, the screw speed in the low-speed operation mode is controlled at 10~30 rpm; for plastic resin sample preparation equipment with a length-to-diameter ratio greater than 30, the cleaning time is not less than 20 minutes.

[0049] In the above embodiments, during the dynamic cleaning stage, the screw of the extruder 200 is controlled to operate at a low speed of 10~30 rpm. This speed range allows the composite cleaning material to have sufficient residence time in the barrel, fully contacting the residues on the inner wall of the barrel and the surface of the screw. At the same time, it avoids the composite cleaning material from passing through the barrel too quickly due to excessive speed, which would prevent effective grinding. Since the barrel is long and has more dead corners in the flow channel, it ensures that the composite cleaning material can flow through all parts of the barrel, especially the dead corners that are difficult to clean, such as the root of the screw and the flow channel of the die head. By controlling the screw speed and cleaning time, the cleaning intensity can be adjusted, which can thoroughly remove stubborn cured resin without damaging the metal surface of the equipment due to excessive grinding.

[0050] It achieves precise control of cleaning intensity, allowing for flexible adjustments based on different equipment types and varying degrees of contamination, ensuring thorough cleaning. The low-speed operation mode reduces energy consumption and minimizes wear on the screw and barrel, extending the equipment's lifespan. For equipment with a long-to-diameter ratio, the extended cleaning time effectively solves the problem of traditional cleaning methods failing to clean dead zones in the flow channels, improving the overall cleaning comprehensiveness.

[0051] Example 10 Please see Figures 1-8 After step S4, an auxiliary purging step is also included: high-pressure compressed air or inert gas is introduced into the barrel to purge the residual fine abrasive powder.

[0052] In the above embodiments, after discharging the waste residue and residual composite cleaning material, the heating system of the extruder 200 is turned off, and high-pressure compressed air or inert gas is introduced into the barrel through the main feed port of the extruder 200. The high-pressure gas flows at high speed in the barrel, forming strong turbulence, which can blow away the fine abrasive powder remaining on the inner wall of the barrel, the screw groove, and the dead corners of the die flow channel, so as to avoid these powder residues affecting the subsequent production quality. The blowing process lasts for 3 to 5 minutes until there are no obvious powder particles in the gas discharged from the die. After the blowing is completed, new resin raw material is introduced for replacement to further ensure the cleanliness of the barrel.

[0053] By adding an auxiliary purging step, the problem of traditional cleaning methods failing to remove fine abrasive powder is effectively solved, further improving the thoroughness of cleaning. High-pressure gas purging can reach dead zones in the flow channel that are difficult for new resin raw materials to access, removing residual powder impurities. This prevents abrasive powder from mixing into subsequent products, ensuring product quality. At the same time, the purging process is fast and efficient, does not significantly prolong the overall cleaning time, and has minimal impact on production efficiency.

[0054] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0055] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A non-disassembly cleaning device for plastic resin sample preparation equipment, characterized in that, include: The mounting frame (100) has a multi-layer frame structure and is installed on one side of the feed inlet of the extruder (200); An extrusion mixing device is installed on the mounting frame (100), and the output port is mounted on the upper part of the extruder (200); The hard abrasive storage tank (300) and the carrier resin storage tank (400) are respectively installed on the mounting frame (100), and are both connected to the feed inlet of the extrusion mixing device through a negative pressure conveying unit; wherein The hard abrasive storage tank (300) is used to store hard inorganic abrasive, which is one or more of corundum, silicon carbide, and zirconium oxide; The carrier resin storage tank (400) is used to store thermoplastic carrier resin, which is selected from at least one of low-density polyethylene, ethylene-vinyl acetate copolymer, and polystyrene. The extrusion mixing device includes: A heating mixing chamber (500), a flexible mixing container (600) disposed within the heating mixing chamber (500), and a swing extrusion member (700) disposed corresponding to the flexible mixing container (600); The heating mixing chamber (500) is used to provide a temperature that allows the carrier resin to initially melt; The oscillating extrusion member (700) is used to periodically extrude the flexible mixing container (600) so that the hard abrasive and the initially molten carrier resin are uniformly mixed in the flexible mixing container (600) to form a composite cleaning material. The composite cleaning material is a homogeneous mixture of hard inorganic abrasive and thermoplastic carrier resin.

2. The non-disassembly cleaning device for plastic resin sample preparation equipment according to claim 1, characterized in that, The extrusion mixing device further includes: The drive unit (800) is mounted on the mounting frame (100) at its top end and connected to the swing extrusion member (700) at its bottom end; wherein The drive unit (800) is used to drive the oscillating extrusion component to oscillate conically around the central axis of the flexible mixing container (600); The drive unit (800) includes: A linear drive unit (810) is vertically arranged, and its mounting base is connected to the mounting frame (100); The drive motor (820) is connected at its top end to the telescopic end of the linear drive unit (810) and at its bottom end to the oscillating extrusion component.

3. The non-disassembly cleaning device for plastic resin sample preparation equipment according to claim 2, characterized in that, The swing extrusion component includes: The drive rod (710) is connected at its top end to the drive motor (820) and at its bottom end passes through the heating and mixing chamber (500); The cup body (720) is rotated with its opening facing downwards, and the bottom of the cup is connected to the drive rod (710); A liquid-filled elastic actuation bladder (730) has an inlet connected to the bottom end of the actuation rod (710); wherein The drive rod (710) has a hollow tube structure at one end near the liquid-filled elastic drive bladder (730), and the liquid-filled elastic drive bladder (730) is connected to the bottom end of the drive rod (710). The drive rod (710) has an inlet at one end near the drive motor (820), and one end of the inlet is connected to the interior of the drive rod (710); The water supply pipe (740) has one end rotated and sealed near the inlet of the drive rod (710), and the other end is connected to the liquid supply device; A limiting baffle (750) is provided on one side of the liquid-filled elastic drive bladder (730), and its top end is installed on the inner bottom surface of the rotating cup body (720); The liquid-filled elastic drive bladder (730) has a swing part (760) on the side away from the limiting baffle (750). After the liquid-filled elastic drive bladder (730) is filled and expanded, it is used to push the swing part (760) to move.

4. The non-disassembly cleaning device for plastic resin sample preparation equipment according to claim 3, characterized in that, The swinging part (760) includes: A limiting plate (761) is horizontally installed inside the bottom opening of the rotating cup body (720); A strip-shaped hole (762) is formed on the surface of the limiting plate (761); The swing shaft (763) has one end passing through the strip hole (762) and is located on the side of the liquid-filled elastic drive bladder (730) away from the limiting baffle (750); A tension spring (764) is installed at one end on the side of the strip hole (762) near the limiting baffle (750), and the other end is connected to the outer wall of the swing shaft (763); A circular pressure plate (765) is disposed below the swing shaft (763), and the bottom end of the swing shaft (763) is coaxially connected to the surface of the circular pressure plate (765); wherein The swing shaft (763) forms a tapered expansion section at one end near the circular pressure plate (765), and its diameter gradually increases in the direction toward the circular pressure plate (765); The bottom end of the limiting baffle (750) and the middle position of the strip hole (762) are both provided with slots (766). After the liquid-filled elastic drive bladder (730) drains, the tension spring (764) pulls the swing shaft (763) into the slot (766), which is used by the linear drive unit (810) to push the circular pressure plate (765) to squeeze the flexible mixing container (600).

5. The non-disassembly cleaning device for plastic resin sample preparation equipment according to claim 4, characterized in that, The swing extrusion component also includes: An elastic guide support unit (770) is disposed within the heating and mixing chamber (500); wherein The elastic guide support unit (770) includes: The telescopic sleeve (771) is provided in at least two sets. The two sets of telescopic sleeves (771) are symmetrically arranged with the axis of the heating mixing chamber (500) as the axis of symmetry, and the top end is connected to the inner top surface of the heating mixing chamber (500). The number of guide contacts (772) corresponds one-to-one with the number of telescopic sleeves (771), and they are respectively connected to the bottom end of the telescopic sleeves (771). The bottom end is conical and abuts against the surface of the circular pressure plate (765). The springs (773) are arranged in a one-to-one correspondence with the telescopic sleeves (771), and are respectively arranged inside the telescopic sleeves (771). One end is connected to the top surface of the guide contact block (772), and the other end is connected to the top surface inside the heating and mixing chamber (500).

6. The non-disassembly cleaning device for plastic resin sample preparation equipment according to claim 5, characterized in that, The swing extrusion component also includes: A liquid-filled deformable support platform (780) is disposed in the heating and mixing chamber (500) and is coaxially arranged with the rotating cup body (720); The fluid-filled deformable bearing platform (780) includes: A cup-shaped base (781) is installed at the bottom of the heating mixing chamber (500), and its edge is sealed to the inner wall of the bottom of the heating mixing chamber (500); The elastic cone top (782) has a bottom opening that connects to the top opening of the cup-shaped base (781); Spokes (783) are provided at intervals, and the spokes (783) are arranged in a radiating manner on the inner wall of the elastic cone apex (782) with the top of the elastic cone apex (782) as the center; A support platform (784) is coaxially arranged inside the cup-shaped base (781) to support the elastic cone top (782) after the liquid-filled deformable support platform (780) discharges liquid; The liquid-filled deformable support (780) is connected to the liquid supply equipment; The flexible mixing container (600) is integrally molded from peroxide vulcanized fluororubber, and has a flat circular bladder structure with rounded edges and symmetrical arc surfaces on the upper and lower surfaces. It is located between the circular pressure plate (765) and the elastic cone top (782). The flexible mixing container (600) is provided with a feed pipe (785) on one side. One end of the feed pipe (785) is connected to the interior of the flexible mixing container (600), and the other end passes through the heating mixing chamber (500) and is connected to the hard abrasive storage tank (300) and the carrier resin storage tank (400) respectively. The flexible mixing container (600) is also provided with a discharge pipe (786) on the other side. One end of the storage tank is connected to the interior of the flexible mixing container (600), and the other end passes through the heating mixing chamber (500) and is connected to a solenoid valve. The solenoid valve is arranged at the feed port of the extruder (200).

7. A cleaning method, applicable to the cleaning apparatus as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Hard inorganic abrasive and thermoplastic carrier resin are fed into the flexible mixing container (600) of the oscillating extrusion premixing device through a negative pressure conveying unit. The heating mixing chamber (500) is heated to 70℃~120℃ to soften and melt the carrier resin. The oscillating extrusion component (700) periodically extrudes the flexible mixing container (600) to uniformly mix the hard abrasive and the initially softened and melted carrier resin to form a composite cleaning material. S2. Heat the plastic resin sample preparation equipment to be cleaned to the melting processing temperature of the carrier resin, and maintain the temperature inside the barrel at 180℃~280℃. S3. Start the screw of the extruder (200) and feed the composite cleaning material directly into the barrel from the oscillating extrusion premixing device in a low-speed operation mode. Under the shearing action of the screw and the friction of the inner wall of the barrel, the composite cleaning material uses hard abrasive to grind and peel off the cured resin adhering to the metal surface. S4. After cleaning and circulating for 10-30 minutes, reduce the screw speed to discharge the waste residue and residual composite cleaning material. S5. Introduce new resin raw material for production into the barrel to replace the residual composite cleaning material in the barrel until the extrudate is free of black spots and impurities.

8. The cleaning method according to claim 7, characterized in that, In step S1, the hard inorganic abrasive has a particle size of 80~300μm and is surface modified with a silane coupling agent; the melt flow rate of the thermoplastic carrier resin is 5~50g / 10min; and the mass ratio of the hard inorganic abrasive to the thermoplastic carrier resin is 1:1~1:

5.

9. The cleaning method according to claim 8, characterized in that, In step S3, the screw speed in the low-speed operation mode is controlled at 10~30 rpm; for plastic resin sample preparation equipment with a length-to-diameter ratio greater than 30, the cleaning time is not less than 20 minutes.

10. The cleaning method according to claim 9, characterized in that, After step S4, an auxiliary purging step is also included: high-pressure compressed air or inert gas is introduced into the barrel to purge the residual fine abrasive powder.

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