A waste plastic crusher

Abstract

The invention relates to the technical field of pulverizers, and discloses a waste plastic pulverizer, comprising a box body, a pulverizing roller, and a driving structure. Two or more pulverizing rollers are symmetrically and rotatably installed in the box body. The driving structure is arranged at both ends of the pulverizing rollers and drives the pulverizing rollers to rotate. A cooling chamber and a steam chamber are coaxially provided in the pulverizing roller. The diameter of the cooling chamber is larger than the diameter of the steam chamber. A filter ring that only allows water vapor to pass through is arranged between the cooling chamber and the steam chamber. Pure water is introduced into the cooling chamber. A plurality of nozzles connected to the steam chamber are also arranged on the surface of the pulverizing roller, and a safety valve is arranged on the nozzle. When the surface temperature of the pulverizing roller rises, the pure water in the cooling chamber absorbs heat and evaporates, so that the surface temperature of the pulverizing roller is reduced and maintained within a reasonable range, thereby avoiding equipment damage caused by overheating, and preventing local overheating of the plastic and melting, thereby ensuring the pulverizing quality, and preventing the plastic from being deformed or adhering to the equipment due to high temperature.

Description

Technical Field

[0001] The invention relates to the technical field of pulverizers, in particular to a waste plastic pulverizer. Background Art

[0002] Plastic pulverizer is a kind of equipment widely used in the field of plastic recycling and regeneration. It is mainly used to crush and pulverize various waste plastics for subsequent treatment and reuse. With the widespread application of plastic products in daily life and industrial production, a large amount of plastic waste is also generated. In order to achieve the recycling of resources and reduce environmental pollution, plastic pulverizer has become an indispensable and important equipment. The working principle of plastic pulverizer is mainly to drive the blade to rotate through the motor to shear, tear and squeeze the plastic waste entering the machine into small pieces or particles. According to the design and purpose of the pulverizer, plastic pulverizer can be divided into many types, including shear pulverizer, shredder and impact pulverizer. Each type of pulverizer has its own unique structure and working mode, which is suitable for the treatment of plastic waste of different types and shapes. Plastic pulverizer plays a vital role in the process of plastic recycling and regeneration. Crushing plastic waste into small pieces or particles by pulverizer can greatly reduce the difficulty and cost of subsequent treatment. For example, in the plastic granulation process, the crushed plastic particles are easier to melt and mix, thereby improving the granulation efficiency and product quality. In addition, the shredder can also be used for the pretreatment of plastic waste, such as cleaning and dehydration, to provide good raw material conditions for subsequent recycling processes.

[0003] However, during the long-term operation of the existing plastic crusher, the high-speed rotation of the blade will generate a lot of friction between the plastic waste and the fixed blade or other parts inside the machine body. This friction is not only between the blade and the plastic, but also between mechanical bearings, gears and other parts. These friction forces are converted into heat energy, causing the temperature inside the machine to rise. In addition, different types of plastics will have different thermoplastic reactions after being subjected to force during the crushing process. For example, some thermoplastics will partially melt when subjected to shear force and friction. This melting process will also release heat, exacerbating the rise in temperature inside the crusher. Continuous high temperature will cause the key components of the equipment (such as bearings, blades and motors) to be subjected to greater thermal stress, causing these components to age and wear faster. This not only reduces the service life of the equipment, but may also increase the frequency of maintenance and replacement, thereby increasing operating costs. At the same time, when the temperature inside the equipment is too high, the mechanical parts may expand, resulting in smaller assembly gaps and increased friction. This will make the equipment more difficult to operate, reduce efficiency, and even cause mechanical failures, further affecting the normal operation of the equipment. And plastics will begin to soften or even melt at high temperatures. The melting of plastic caused by high temperature will make the crushed plastic particles uneven in size, and even produce a large number of molten blocks, affecting the quality and effect of subsequent processing. The melted plastic will also adhere to the blades and the inside of the machine body, hindering the normal crushing process. The adhered plastic not only affects the crushing effect, but also increases the difficulty of cleaning the equipment and affects production efficiency. In addition, when the crushing roller of the existing plastic crusher rotates at a high speed, a large amount of plastic dust will be generated. This dust will be affected by the centrifugal force of the crushing roller and fly out from the feed port, affecting the environment around the equipment. In addition, the plastic material will also generate static electricity during the crushing process, which will also cause the plastic dust to fly and be adsorbed inside the equipment. Summary of the invention

[0004] (I) Technical problems to be solved: In view of the shortcomings of the prior art, the present invention provides a waste plastic pulverizer, which has the advantages of reducing the heat generated by the high-speed rotation of the pulverizing roller to pulverize plastic, while reducing the dust generated in the process of pulverizing plastic by the equipment, and reducing the static electricity generated when pulverizing plastic. This solves the problem that in the process of pulverizing plastic by the existing plastic pulverizer, due to the high-speed rotation of the pulverizing roller and pulverizing the plastic, a large amount of heat will accumulate on the surface of the pulverizing roller, affecting the life of the equipment and the quality of plastic pulverization, and a large amount of plastic dust will be generated to fly around and affect the surrounding environment. The static electricity generated inside the equipment during the plastic pulverization process will cause some plastic dust to be adsorbed in the equipment.

[0005] (II) Technical solution: In order to achieve the above-mentioned purpose of reducing the heat generated by the high-speed rotation of the crushing roller to crush the plastic, reducing the dust generated in the process of the equipment crushing the plastic, and reducing the static electricity generated when crushing the plastic, the present invention provides the following technical solution: a waste plastic crusher, including a box body, a crushing roller, and a driving structure, two or more crushing rollers are symmetrically installed in the box body for rotation, the driving structure is arranged at both ends of the crushing roller and drives the crushing roller to rotate, a cooling chamber and a steam chamber are coaxially opened in the crushing roller, the diameter of the cooling chamber is larger than the diameter of the steam chamber, and a filter ring that only allows water vapor to pass through is arranged between the cooling chamber and the steam chamber, pure water is introduced into the cooling chamber, and a plurality of nozzles connected to the steam chamber are also opened on the surface of the crushing roller, and a safety valve is arranged on the nozzle; after the surface of the crushing roller is heated, the heat is transferred to the pure water in the cooling chamber and evaporated into the steam chamber, and when the pressure in the steam chamber reaches the set value of the safety valve, steam is sprayed into the box body from the nozzle.

[0006] Preferably, both ends of the filter ring are fixedly connected to the crushing roller.

[0007] Preferably, sealing rings are rotatably provided on both end surfaces of the pulverizing roller, a water injection pipe is provided on the sealing ring, the water injection pipe is connected to the cooling chamber, the sealing ring passes through the box body, and the sealing ring is rotatably connected to the box body.

[0008] Preferably, the distance and diameter between two or more pulverizing rollers are adjusted according to the different pulverizing sizes required for the plastics.

[0009] Preferably, inclined plates are further provided on both sides of the box body, and a refrigeration plate is fixedly provided inside the inclined plates, and the refrigeration plate reduces the surface temperature of the inclined plates and the temperature inside the box body when the refrigeration plate is in operation.

[0010] Preferably, a feed port is provided above the box body, and a discharge port is provided below the box body, and the cross-sectional shapes of the feed port and the discharge port are both inverted trapezoidal.

[0011] Preferably, the nozzles are arranged in an array along the axial direction of the crushing roller.

[0012] Preferably, the surface of the pulverizing roller is tooth-shaped or spiral blade-shaped.

[0013] (III) Beneficial effects: Compared with the prior art, the present invention provides a waste plastic crusher, which has the following beneficial effects: 1. The waste plastic crusher, through the coordinated use of a crushing roller structure, a filter ring structure, a cooling chamber structure, and a steam chamber structure, is compared with a traditional crushing roller. When the surface temperature of the crushing roller increases, the pure water in the cooling chamber will absorb heat and evaporate. Pure water has a high specific heat capacity and can absorb a large amount of heat, resulting in a temperature increase, and the pure water begins to evaporate to form water vapor. The evaporation process requires the absorption of a large amount of heat, which will greatly reduce the temperature of the surrounding environment, that is, the surface temperature of the crushing roller. Through the endothermic evaporation of pure water, the temperature of the crushing roller surface will decrease and be maintained within a reasonable range, avoiding equipment damage caused by overheating. Excessive temperature will accelerate the aging and wear of equipment components, and the endothermic evaporation of pure water can effectively reduce the temperature, thereby extending the service life of the equipment. In addition, by controlling the temperature of the crushing roller, local overheating of the plastic can be prevented, and melting can be avoided, thereby ensuring the crushing quality. It can also prevent the plastic from deforming or adhering to the equipment due to high temperature, ensuring that the crushed particles are uniform and of stable quality.

[0014] 2. The waste plastic pulverizer, through the coordinated use of the pulverizing roller structure, the filter ring structure, the cooling chamber structure, the steam chamber structure, the nozzle structure, and the safety valve structure, will generate a large amount of plastic dust in the pulverizing process compared with the traditional technical structure, and static electricity will also be generated in the plastic pulverizing process. After the water vapor in the steam chamber inside the pulverizing roller of the waste plastic pulverizer gradually increases, when the pressure inside the steam chamber reaches the pressure set by the safety valve, the steam will be ejected from the nozzle position through the safety valve, and because the pulverizing roller is in high-speed rotation, the ejected steam will cover the entire interior of the box. After the steam is ejected into the interior of the box, the water vapor content inside the box will increase, thereby increasing the humidity inside the box. The increase in humidity helps to further absorb and conduct heat, reduce the static electricity generated by the plastic and the scattering of plastic dust, maintain a suitable working environment, and improve the efficiency and service life of the pulverizer. At the same time, this structure spontaneously increases the humidity in the box, and adjusts the humidity by using the heat generated during the pulverizing process, which not only effectively reduces the temperature of the pulverizing roller and the plastic, but also uses the heat generated by them to adjust the humidity in the box. This design not only improves the overall energy efficiency of the system, but also simplifies the structure and maintenance requirements of the equipment.

[0015] 3. The waste plastic shredder uses a ramp plate structure and a refrigeration plate structure in combination. Compared with the traditional technical structure, it cannot adjust the humidity in the box and will also generate a large amount of plastic dust at the discharge port. When the temperature or humidity in the box is too high, the refrigeration plate quickly absorbs and transfers the heat on the surface of the ramp plate through the working mechanism, so that the temperature of the ramp plate surface drops rapidly. This refrigeration plate usually has a high-efficiency heat exchange capacity and can significantly reduce the temperature of the ramp plate surface in a short time, so that the temperature in the box drops rapidly. The lower temperature can reduce the friction between the equipment and the material, thereby improving the pulverizing efficiency, and through effective temperature control, the powder can be prolonged. The service life of the crusher is extended and the maintenance cost is reduced. When the steam in the box meets the inclined plate, it will condense into water droplets on the surface of the inclined plate and be discharged from the discharge port along the inclined plate. Condensing the steam into water droplets and discharging them can effectively prevent excessive accumulation of humidity in the box and avoid the adverse effects of excessive humidity on equipment and materials. At the same time, when the steam condenses into water droplets on the surface of the inclined plate, a liquid film will form on the surface of the water droplets. This liquid film can effectively capture and adhere to fine plastic dust particles. Under the action of gravity, the water droplets adhered to the plastic dust will slide down along the inclined plate and finally be discharged from the discharge port, further reducing the plastic dust at the discharge port of the equipment, reducing dust pollution and improving the air quality of the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the waste plastic crusher in the present invention.

[0017] Figure 2 It is a structural front view of the waste plastic crusher in the present invention.

[0018] Figure 3 It is a structural side view of the waste plastic crusher in the present invention.

[0019] Figure 4 It is a structural top view of the waste plastic crusher in the present invention.

[0020] Figure 5 It is the structural AA cross-sectional view of the waste plastic pulverizer in the present invention.

[0021] Figure 6 It is the structure BB cross-sectional view of the waste plastic crusher in the present invention.

[0022] Figure 7 It is a schematic diagram of the local structure A of the waste plastic crusher in the present invention.

[0023] Figure 8 It is a schematic diagram of the local structure B of the waste plastic crusher in the present invention.

[0024] Fig. 9It is a cross-sectional view of the crushing roller structure of the waste plastic crusher in the present invention.

[0025] In the figure: 1-box, 2-feed port, 3-discharge port, 4-driving structure, 500-crushing roller, 501-filter ring, 502-cooling chamber, 503-steam chamber, 510-nozzle, 511-safety valve, 520-sealing ring, 521-water injection pipe, 6-inclined plate, 7-refrigeration plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , Fig. 9A waste plastic crusher includes a housing 1, a crushing roller 500, and a driving structure 4. Two or more crushing rollers 500 are symmetrically installed in the housing 1 for rotation. The symmetrical installation of multiple crushing rollers 500 can ensure that the crusher is evenly stressed during operation, avoid the unbalanced stress caused by a single crushing roller 500, reduce the vibration and noise of the equipment, and thus improve the crushing efficiency. Multiple crushing rollers 500 can process more plastics at the same time, and improve the overall crushing capacity and efficiency. The driving structure 4 is arranged at both ends of the crushing roller 500 and drives the crushing roller 500 to rotate. The driving structure 4 is arranged at both ends of the crushing roller 500 to ensure that the rotation of the crushing roller 500 is more stable and uniform, and avoids the tilting and instability caused by the single-end drive. The double-end drive can evenly distribute the transmission load, reduce the single-point load, and improve the driving efficiency and equipment life. The surface of the crushing roller 500 is toothed or spiral blade-shaped. The toothed or spiral blade-shaped surface design can increase the ability to grab and cut plastics, making the crushing more thorough and efficient. The spiral blade can guide the plastic to move along the surface of the crushing roller 500, reduce the possibility of blockage and material accumulation, and improve the continuous working capacity of the crusher. The plastic to be crushed is arranged between the crushing rollers 500. The plastic is placed between the two high-speed rotating crushing rollers 500, and a strong mechanical force can be applied to crush it, thereby improving the crushing efficiency and effect. A cooling chamber 502 and a steam chamber 503 are coaxially opened in the crushing roller 500. The diameter of the cooling chamber 502 is larger than the diameter of the steam chamber 503, and a filter ring 501 that only allows water vapor to pass is arranged between the cooling chamber 502 and the steam chamber 503. The filter ring 501 material adopts porous ceramic or hydrophobic polymer membrane or hydrophobic microporous filter or selective permeable membrane. The filter ring 501 only allows water vapor to pass, which can prevent the pure water in the cooling chamber 502 from entering the steam chamber 503, thereby ensuring the purity of the steam. The design of the filter ring 501 can ensure that the water in the cooling chamber 502 evaporates effectively, improve the heat exchange efficiency, and achieve a better cooling effect. Pure water is introduced into the cooling chamber 502. During the crushing process, friction will generate a large amount of heat. Plastic is a heat-sensitive material. Excessive temperature may cause the plastic to soften, melt or produce bad odors, or even damage the equipment. Pure water has a high specific heat capacity and can effectively absorb the heat on the surface of the crushing roller 500. It absorbs a large amount of latent heat by evaporation, thereby reducing the temperature of the surface of the crushing roller 500 and ensuring that the crushing process is carried out within a suitable temperature range. By controlling the temperature of the crushing roller 500, it is possible to prevent the plastic from deforming or adhering to the equipment at high temperatures, ensuring that the crushed particles are uniform and of stable quality. The surface of the crushing roller 500 is also provided with a plurality of nozzles 510 connected to the steam chamber 503. The water vapor inside the crushing roller 500 is ejected through the nozzles 510, which can effectively release the pressure in the steam chamber 503, and use these steam to increase the humidity inside the box 1. The increase in humidity can further absorb and conduct heat, reduce static electricity and dust scattering generated by plastics, and improve crushing efficiency.The nozzle 510 allows steam to be ejected, which helps to control the temperature inside the crushing roller 500 and prevent the equipment from overheating. The design of multiple nozzles 510 ensures that the steam can be evenly distributed throughout the box 1, improving the uniformity of humidity distribution inside the box 1. The nozzles 510 are arranged in an array along the axial direction of the crushing roller 500. The nozzles 510 arranged in the axial array can ensure that the steam is evenly sprayed to various areas inside the box 1, thereby improving the uniformity of humidity inside the box 1 and ensuring that the entire crushing area has a suitable humidity level. The nozzles 510 arranged in an array can better utilize the rotating centrifugal force of the crushing roller 500, so that the ejected steam is more evenly and efficiently diffused throughout the box 1. A safety valve 511 is provided on the nozzle 510. The main function of the safety valve 511 is to prevent the pressure in the steam chamber 503 from being too high and ensure that the equipment operates within a safe working range. When the pressure inside the steam chamber 503 reaches the value set by the safety valve 511, the safety valve 511 will automatically open to release steam; after the surface of the crushing roller 500 is heated, the pure water in the cooling chamber 502 will absorb heat and evaporate. Pure water has a high specific heat capacity and can absorb a large amount of heat, resulting in a temperature increase. The pure water begins to evaporate and forms water vapor. The evaporation process requires the absorption of a large amount of latent heat, which will greatly reduce the temperature of the surrounding environment, that is, the surface temperature of the crushing roller 500. Through the heat absorption and evaporation of pure water, the temperature of the surface of the crushing roller 500 will be reduced and maintained within a reasonable range, avoiding equipment damage caused by overheating. Excessive temperature will accelerate the aging and wear of equipment components, while the heat absorption and evaporation of pure water can effectively reduce the temperature, thereby extending the service life of the equipment, and by controlling the temperature of the crushing roller 500, the plastic can be prevented from being locally overheated and melted, thereby ensuring the crushing quality, and preventing the plastic from being deformed or adhering to the equipment due to high temperature, ensuring that the crushed particles are uniform and of stable quality. When the water vapor in the steam chamber 503 inside the crushing roller 500 gradually increases, when the pressure inside the steam chamber 503 reaches the pressure set by the safety valve 511, the steam will be ejected from the nozzle 510 through the safety valve 511, and because the crushing roller 500 is rotating at a high speed, the ejected steam will cover the entire interior of the box 1. After the steam is ejected into the interior of the box 1, the water vapor content inside the box 1 will increase, thereby increasing the humidity inside the box 1. The increase in humidity helps to further absorb and conduct heat, reduce static electricity generated by plastics and the dispersion of plastic dust, maintain a suitable working environment, and improve the efficiency and service life of the crusher. At the same time, this structure spontaneously increases the humidity in the box 1, and adjusts the humidity by utilizing the heat generated during the crushing process, which not only effectively reduces the temperature of the crushing roller 500 and the plastic, but also uses the heat generated by them to adjust the humidity in the box 1. This design not only improves the overall energy efficiency of the system, but also simplifies the structure and maintenance requirements of the equipment.

[0028] See also Figure 6 and Figure 8, both ends of the filter ring 501 are fixedly connected to the crushing roller 500. The main function of the filter ring 501 is to isolate the cooling chamber 502 and the steam chamber 503, but allow water vapor to pass through. This design can ensure that the pure water in the cooling chamber 502 will not directly enter the steam chamber 503, but only allow water vapor to pass through, so as to achieve a clear division of labor between cooling and steam generation and avoid mixing. The filter ring 501 is fixedly connected to the crushing roller 500, which can improve the stability of the overall structure, prevent loosening or displacement when the crushing roller 500 rotates at high speed, and ensure long-term stable working performance. Sealing rings 520 are rotatably arranged on the two end surfaces of the crushing roller 500. The sealing rings 520 are mainly used to prevent the pure water or generated water vapor in the cooling chamber 502 from leaking to the external environment, ensuring the sealing and working efficiency of the system. The sealing ring 520 can protect the internal and external structures of the crushing roller 500 from being polluted or damaged by the external environment, and improve the durability and service life of the equipment. The sealing ring 520 is provided with a water injection pipe 521, which is connected to the cooling chamber 502. The water injection pipe 521 is connected to the cooling chamber 502, and can continuously replenish pure water for the cooling chamber 502, ensuring that there is always enough pure water in the cooling chamber 502 for heat absorption and evaporation during long-term operation. Through the water injection pipe 521, the pure water in the cooling chamber 502 can be replenished in time to ensure the continuity and efficiency of the cooling function, thereby effectively controlling the temperature of the crushing roller 500 and avoiding equipment damage or crushing quality problems caused by overheating. The sealing ring 520 runs through the housing 1, and the sealing ring 520 is rotatably connected to the housing 1. When the crushing roller 500 rotates at a high speed, the rotatable connection between the sealing ring 520 and the housing 1 can realize dynamic sealing, avoiding sealing failure caused by vibration or displacement caused by rotation. Since the sealing ring 520 is rotatably connected to the crushing roller 500, the rotation of the crushing roller 500 will not affect the stability of the sealing ring 520, ensuring that the water injection pipe 521 can fill water into the cooling chamber 502 at a fixed position. When the crushing roller 500 rotates at high speed, since the sealing ring and the crushing roller 500 are rotationally connected, the rotation of the crushing roller 500 does not affect the sealing ring, so that the water injection pipe 521 can fill water into the cooling chamber 502 at a fixed position. The design of the water injection pipe 521 at a fixed position avoids a complex rotating water supply system, simplifies the structure of the equipment, and reduces the failure rate and maintenance cost. The design of the water injection pipe 521 at a fixed position makes cooling management more efficient, and can control the amount of water in the cooling chamber 502 in real time and accurately, thereby effectively controlling the temperature of the surface of the crushing roller 500 and ensuring the continuity and stability of the crushing process.

[0029] See also Figure 4 and Figure 2, the distance and diameter between two or more crushing rollers 500 are adjusted according to the different crushing sizes required for the plastic. There are many types of plastics and crushing requirements. By adjusting the distance and diameter between the crushing rollers 500, it is possible to adapt to plastics of different types and sizes, thereby achieving the best crushing effect. By adjusting the distance and diameter between the crushing rollers 500, the size of the crushed plastic particles can be accurately controlled to meet the needs of different application scenarios. Different plastic materials have different requirements for crushing force and crushing conditions. By adjusting the parameters of the crushing rollers 500, the crushing efficiency can be optimized and the productivity of the equipment can be improved. Adapt to the crushing needs of different plastics, avoid the operation of the equipment under inappropriate conditions, reduce wear and damage, and extend the life of the equipment.

[0030] See also Figure 5 , inclined plates 6 are also provided on both sides of the box body 1, and a cooling plate 7 is fixedly provided inside the inclined plate 6. When the cooling plate 7 is working, the surface temperature of the inclined plate 6 and the temperature inside the box body 1 are reduced. During the crushing process, the temperature will increase significantly due to friction and mechanical force. The cooling plate 7 inside the inclined plate 6 can quickly reduce the temperature inside the box body 1 to prevent the equipment from overheating. Plastic materials are easy to melt and deform at high temperatures, affecting the crushing quality. The cooling plate 7 effectively reduces the temperature inside the box body 1 and maintains the stable state of the plastic. Under high temperature conditions, water vapor is easy to accumulate in the box body 1 and increase humidity. The cooling plate 7 reduces the temperature, so that the water vapor condenses into water droplets on the surface of the inclined plate 6 and is discharged through the inclined plate 6 to prevent excessive humidity accumulation. The condensed water droplets form a liquid film, which can capture and adhere to fine plastic dust particles, reduce dust pollution, and improve the working environment. A feed port 2 is provided above the box body 1, and a discharge port 3 is provided below the box body 1. The cross-sectional shapes of the feed port 2 and the discharge port 3 are both inverted trapezoids. The design of the upper feed port 2 and the lower discharge port 3 utilizes gravity to facilitate the entry and exit of materials, reduce manual intervention, and improve work efficiency. The inverted trapezoidal design of the feed port 2 and the discharge port 3 can avoid accumulation and blockage of materials during the entry and exit process, ensuring smooth flow of materials.

[0031] Working principle: During the operation of the waste plastic crusher, the plastic to be crushed is first put into the feed port 2. The plastic will fall between the high-speed rotating crushing rollers 500 and be crushed. When the plastic enters between the high-speed rotating crushing rollers 500, the crushing rollers 500 apply mechanical force to the plastic to crush it. In this process, the plastic and the surface of the crushing roller 500 will have severe friction, and the heat generated by the friction will cause the temperature to rise. And plastic is usually a heat-sensitive material. When subjected to mechanical force, the internal molecular chain will move and deform, and the friction between molecules will be converted into heat energy. In addition, the thermal conductivity of plastic is poor, and the heat is not easy to dissipate, resulting in a rapid increase in local temperature. After the temperature is increased, the heat will first be transferred to the grinding roller 500 to increase its surface temperature. When the surface temperature of the grinding roller 500 increases, it will heat the pure water in the cooling chamber 502 attached to it. The pure water will absorb the heat from the surface of the grinding roller 500, so that the surface temperature of the grinding roller 500 will decrease. After absorbing a certain amount of heat, the pure water will evaporate to form water vapor, and enter the steam chamber 503 through the filter ring 501. When the water vapor in the steam chamber 503 gradually increases, the pressure in the steam chamber 503 will gradually increase. When the pressure inside the cavity 503 reaches the pressure set by the safety valve 511, the steam will be ejected from the nozzle 510 through the safety valve 511, and because the crushing roller 500 is rotating at high speed, the crushing roller 500 will generate a strong centrifugal force when rotating at high speed, and the centrifugal force will cause the steam to diffuse outward from the nozzle 510 quickly, and the high-speed rotating crushing roller 500 will also form eddies around it, which will help the steam to diffuse quickly inside the box 1, so that the steam can cover every corner of the box 1, thereby increasing the humidity inside the box 1. When the temperature or humidity inside the box 1 is too high, the surface temperature of the inclined plate 6 can be greatly reduced by starting the refrigeration plate 7 inside the inclined plate 6, so that the temperature inside the box 1 is rapidly reduced, and when the steam in the box 1 encounters the inclined plate 6, it will condense into water droplets on the surface of the inclined plate 6 and be discharged from the discharge port 3 along the inclined plate 6.

[0032] In the above working process, when the surface temperature of the crushing roller 500 rises, the pure water in the cooling chamber 502 will absorb heat and evaporate. Pure water has a high specific heat capacity and can absorb a large amount of heat, resulting in a temperature rise. The pure water begins to evaporate and forms water vapor. The evaporation process needs to absorb a large amount of latent heat, which will greatly reduce the temperature of the surrounding environment, that is, the surface temperature of the crushing roller 500. Through the heat absorption and evaporation of pure water, the surface temperature of the crushing roller 500 will be reduced and maintained within a reasonable range to avoid equipment damage caused by overheating. Excessive temperature will accelerate the aging and wear of equipment components, and the heat absorption and evaporation of pure water can effectively reduce the temperature, thereby extending the service life of the equipment. By controlling the temperature of the crushing roller 500, the plastic can be prevented from being locally overheated and melted, thereby ensuring the crushing quality. It can also prevent the plastic from being deformed or adhered to the equipment due to high temperature, ensuring that the crushed particles are uniform and of stable quality.

[0033] When the water vapor in the steam chamber 503 inside the crushing roller 500 gradually increases, when the pressure inside the steam chamber 503 reaches the pressure set by the safety valve 511, the steam will be ejected from the nozzle 510 through the safety valve 511, and because the crushing roller 500 is rotating at a high speed, the ejected steam will cover the entire interior of the box 1. After the steam is ejected into the interior of the box 1, the water vapor content inside the box 1 will increase, thereby increasing the humidity inside the box 1. The increase in humidity helps to further absorb and conduct heat, reduce static electricity generated by plastics and the dispersion of plastic dust, maintain a suitable working environment, and improve the efficiency and service life of the crusher. At the same time, this structure spontaneously increases the humidity in the box 1, and adjusts the humidity by utilizing the heat generated during the crushing process, which not only effectively reduces the temperature of the crushing roller 500 and the plastic, but also uses the heat generated by them to adjust the humidity in the box 1. This design not only improves the overall energy efficiency of the system, but also simplifies the structure and maintenance requirements of the equipment.

[0034] When the temperature or humidity in the box 1 is too high, the refrigeration plate 7 quickly absorbs and transfers the heat on the surface of the inclined plate 6 through the working mechanism, so that the temperature on the surface of the inclined plate 6 drops rapidly. Such refrigeration plate 7 usually has a high-efficiency heat exchange capacity, which can significantly reduce the temperature on the surface of the inclined plate 6 in a short time, so that the temperature in the box 1 drops rapidly. The lower temperature can reduce the friction between the equipment and the material, thereby improving the crushing efficiency, and through effective temperature control, the service life of the crusher can be extended and the maintenance cost can be reduced. When the steam in the box 1 encounters the inclined plate 6, it will condense into water droplets on the surface of the inclined plate 6 and be discharged from the discharge port 3 along the inclined plate 6. The steam is condensed into water droplets and discharged, which can effectively prevent the excessive accumulation of humidity in the box 1 and avoid the adverse effects of excessive humidity on the equipment and materials. At the same time, when the steam condenses into water droplets on the surface of the inclined plate 6, a liquid film will form on the surface of the water droplets, which can effectively capture and adhere to fine plastic dust particles. The water droplets adhered with plastic dust will slide downward along the inclined plate 6 under the action of gravity, and finally be discharged from the discharge port 3, further reducing the plastic dust at the discharge port 3 of the equipment, reducing dust pollution, and improving the air quality of the working environment.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste plastic pulverizer, comprising a housing (1), pulverizing rollers (500), and a driving structure (4), wherein two or more pulverizing rollers (500) are symmetrically mounted in the housing (1) for rotation, and the driving structure (4) is arranged at both ends of the pulverizing rollers (500) and drives the pulverizing rollers (500) to rotate, characterized in that: A cooling chamber (502) and a steam chamber (503) are coaxially provided in the pulverizing roller (500); the diameter of the cooling chamber (502) is larger than the diameter of the steam chamber (503); a filter ring (501) that only allows water vapor to pass through is provided between the cooling chamber (502) and the steam chamber (503); pure water is introduced into the cooling chamber (502); a plurality of nozzles (510) that are connected to the steam chamber (503) are also provided on the surface of the pulverizing roller (500); and a safety valve (511) is provided on the nozzle (510). After the surface of the pulverizing roller (500) is heated, the heat is transferred to the pure water in the cooling chamber (502) and evaporates the pure water into the steam chamber (503). When the pressure in the steam chamber (503) reaches the set value of the safety valve (511), the steam is ejected from the nozzle (510) into the box body (1). Inclined plates (6) are also provided on both sides of the box body (1). A cooling plate (7) is fixedly provided inside the inclined plate (6). When the cooling plate (7) is in operation, the surface temperature of the inclined plate (6) and the temperature inside the box body (1) are reduced.

2. A waste plastic pulverizer according to claim 1, characterized in that: Both ends of the filter ring (501) are fixedly connected to the crushing roller (500).

3. A waste plastic pulverizer according to claim 1, characterized in that: Sealing rings (520) are rotatably provided on both end surfaces of the crushing roller (500), a water injection pipe (521) is provided on the sealing ring (520), the water injection pipe (521) is connected to the cooling chamber (502), the sealing ring (520) passes through the box body (1), and the sealing ring (520) is rotatably connected to the box body (1).

4. A waste plastic pulverizer according to claim 1, characterized in that: The distance and diameter between two or more pulverizing rollers (500) are adjusted according to the different pulverization sizes required for the plastic.

5. The waste plastic pulverizer according to claim 1, characterized in that: A feed inlet (2) is provided above the box body (1), and a discharge outlet (3) is provided below the box body (1); the cross-sectional shapes of the feed inlet (2) and the discharge outlet (3) are both inverted trapezoidal.

6. A waste plastic pulverizer according to claim 1, characterized in that: The nozzles (510) are arranged in an array along the axial direction of the pulverizing roller (500).

7. The waste plastic pulverizer according to claim 1, characterized in that: The surface of the crushing roller (500) is tooth-shaped or spiral blade-shaped.

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