Waste plastic pulverizer for asphalt modifier production and processing method

Abstract

The invention provides a waste plastic pulverizer for asphalt modifier production and a processing method. The waste plastic pulverizer comprises a feeding device, a freezing device and a pulverizing device which communicate with one another. The feeding device comprises a hopper, an opening is formed in the top of the hopper, a spraying assembly is arranged at the opening in the top of the hopper, a cutting assembly is arranged in the hopper, and the cutting assembly is located below the spraying assembly; the freezing device comprises a freezing box and a liquid nitrogen conveying assembly, the freezing box is communicated with the hopper, and the output end of the liquid nitrogen conveying assembly is communicated with the freezing box; the grinding device comprises a grinding box and a circulating air cooling assembly, the grinding box is communicated with the end, away from the hopper, of the freezing box, the output end of the circulating air cooling assembly is arranged at the top of the grinding box, an air return device is arranged on the inner bottom wall of the grinding box, and the air return device is communicated with the input end of the circulating air cooling assembly; according to the invention, the grinding effect of waste plastic can be improved, and the production quality of the asphalt modifier is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste treatment, in particular to a waste plastic grinding machine and a processing method for producing asphalt modifiers. Background Art

[0002] The contents in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] Asphalt modifiers refer to a type of substance added to base road asphalt to significantly improve its physical, chemical and road performance. Base asphalt has deficiencies in extreme temperatures, fatigue resistance, durability, etc. Modifiers can give asphalt a variety of performance improvements through physical mixing or chemical reactions. Common types of modifiers include polymers, rubbers, plastics, and others such as sulfur, rock asphalt and natural asphalt.

[0004] Using waste plastics to make asphalt modifiers has the following benefits: it can effectively solve white pollution, realize waste resource utilization, reduce landfill and incineration, while reducing the cost of raw materials for asphalt modifiers, extending the life of roads, and on the other hand, it can also effectively improve the performance of asphalt pavement.

[0005] In the actual production process of asphalt modifiers, it is usually necessary to grind waste plastics into fine particles, usually millimeter-level or even micron-level powders. On the one hand, it can increase the specific surface area and promote melting and dispersion. On the other hand, it can ensure uniform dispersion during the mixing process with asphalt to prevent agglomeration, optimize the coating and adhesion with the aggregate, and achieve the effect of improving the final road performance.

[0006] However, in the process of grinding waste plastics, a large amount of heat will be generated. Since plastics have a low melting point, the large amount of heat generated during the grinding process can easily cause the plastics to melt, which in turn leads to a decrease in the grinding effect of the plastics. As a result, the plastics cannot be ground into suitable plastic powder, resulting in a decrease in the quality of the asphalt modifier and ultimately affecting the pavement performance of the asphalt pavement. Summary of the Invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a waste plastic grinding machine and processing method for asphalt modifier production, which can improve the grinding effect of waste plastics and improve the production quality of asphalt modifiers.

[0008] In one aspect, the present invention provides a waste plastic pulverizer for producing asphalt modifiers.

[0009] The purpose of the present invention is achieved through the following technical solutions:

[0010] A waste plastic grinding machine for producing asphalt modifiers comprises a feeding device, a freezing device and a grinding device which are interconnected; the feeding device comprises a hopper, the top of which is open, a spray assembly is provided at the top opening of the hopper, a cutting assembly is provided in the hopper, and the cutting assembly is located below the spray assembly; the freezing device comprises a freezing box and a liquid nitrogen conveying assembly, the freezing box is connected to the hopper, and the output end of the liquid nitrogen conveying assembly is connected to the freezing box; the grinding device comprises a grinding box and a circulating air cooling assembly, the grinding box is connected to an end of the freezing box away from the hopper, the output end of the circulating air cooling assembly is provided at the top of the grinding box, and an air returner is provided on the bottom wall of the grinding box, and the air returner is connected to the input end of the circulating air cooling assembly.

[0011] By adopting the above technical solution, in actual use, when waste plastic needs to be ground, the waste plastic is first put into the hopper, and the spray component is started to spray the plastic to achieve the effect of moisturizing the surface of the waste plastic and removing static electricity. Then, the waste plastic is cut by the cutting component, and the plastic blocks after cutting enter the freezer through the bottom of the hopper. The liquid nitrogen for freezing is transported into the freezer by the liquid nitrogen conveying component to freeze the plastic blocks in the freezer. The frozen plastic blocks enter the grinding box for grinding. During the grinding process, the circulating air cooling component is used to circulate air in the grinder to achieve the cooling effect. After the grinding is completed, the grinder can be opened to take out the ground plastic powder. The plastic is frozen by liquid nitrogen. On the one hand, the plastic fragments can be transformed from a tough state to a brittle state, which is convenient for subsequent grinding. On the other hand, the plastic fragments are pre-cooled, which can effectively reduce the temperature in the grinding box, thereby further reducing the heat melting during the plastic grinding process, thereby effectively improving the grinding effect, and then improving the production quality of the asphalt modifier, thereby improving the pavement performance of the asphalt pavement to a certain extent.

[0012] In some possible embodiments, the cutting assembly includes a cutting roller and an abutment portion, the abutment portion is fixedly arranged in the hopper, two cutting rollers are provided, and the two cutting rollers are arranged on both sides of the abutment portion, and the two cutting rollers are provided with spiral cutting blades with opposite rotation directions, and abutment blade grooves that are adapted to the cutting blades are provided on both sides of the abutment portion. A driving assembly is provided on the hopper, and the driving assembly is used to drive the two cutting rollers to move toward or away from each other, and a driving source for driving the cutting rollers to rotate is provided on the hopper.

[0013] By adopting the above technical solution, when cutting waste plastics, the cutting roller is driven to rotate by the driving source. As the cutting roller rotates, the cutting blade can be driven to rotate. The waste plastics can be cut by the mutually adapted cutting blades and abutment grooves. In actual use, according to the different types and sizes of the waste plastics, the two cutting rollers are driven to move by the driving component, so as to adjust the distance between the cutting blade and the abutment groove. It can be suitable for waste plastics of different types and sizes, and effectively improves the scope of application of the device.

[0014] In some possible embodiments, the driving assembly includes a first screw and a first motor, a first slide groove is opened on the hopper, the first screw is rotatably set in the first slide groove, the first motor is set on the hopper, the output shaft of the first motor is transmission-connected to the first screw, and two first sliders are slidingly set in the first slide groove, the two first sliders are connected to the two cutting rollers one-to-one, and the first sliders are threadedly sleeved on both ends of the first screw.

[0015] By adopting the above technical solution, when it is necessary to drive the cutting roller to move, the first motor is started to drive the first lead screw to rotate. As the first lead screw rotates, the first slider can be driven to move in the first slide groove, and then the two cutting rollers can be driven to move, so as to achieve the purpose of adjusting the distance between the cutting blade and the abutting blade groove. In the above transmission process, the transmission is carried out through the mutually engaged threads between the first lead screw and the first slider, and the transmission is more stable and reliable, and the thread transmission accuracy is higher. At the same time, the thread transmission has a certain self-locking effect, which can effectively prevent the cutting roller from slipping when cutting waste plastic, thereby improving the overall reliability of the device during actual use.

[0016] In some possible embodiments, two strip holes are opened in the horizontal direction on the inner wall of the hopper, and a strip block is slidably arranged in the strip hole. The cutting roller is rotatably arranged on the strip block, the top of the first slide groove is connected to the bottom of the strip hole, and the strip block is connected to the first slider one by one. A baffle is fixedly arranged on the inner wall of the hopper, and the baffle is arranged at the orifice of the strip hole. The baffle is in sliding contact with the side wall of the strip block close to the cutting roller.

[0017] By adopting the above technical solution, when the distance between the cutting blade and the abutting blade groove is adjusted, as the first slider moves in the first slide groove, the corresponding strip block can be driven to move in the strip hole. During the movement of the strip block, the baffle slides and contacts with the side wall of the strip block, which can block the gap between the strip block and the hopper. When cutting hard plastics such as plastic plates, some plastic flying chips are inevitably generated. By blocking the plastic flying chips with the baffle, the plastic flying chips can be effectively prevented from falling into the first slide groove through the strip hole, thereby providing good protection for the transmission components such as the first screw and the first slider in the first slide groove, thereby reducing the maintenance cost of the device during later use.

[0018] In some possible embodiments, a driving shaft is rotatably provided on each bar block, one end of the driving shaft is fixedly connected to the cutting roller, and the other end extends out of the hopper, and a driven wheel is coaxially fixed on the end of each driving shaft away from the cutting roller, and a mounting block is provided on the outer wall of the hopper for sliding in a vertical direction, and the mounting block is located in the middle of the two bar blocks, and a mounting shaft is rotatably provided on the mounting block, and a first driving wheel and a second driving wheel are sequentially provided on the mounting shaft along the axial direction of the mounting shaft, and a driving belt is wound around the first driving wheel and the second driving wheel, and the other end of the driving belt on the first driving wheel is wound around the driven wheel on the left, and the other end of the driving belt on the second driving wheel is wound around the driven wheel on the right, and the driving source is used to drive the first driving wheel and the second driving wheel to rotate in opposite directions, and a lifting assembly is provided on the hopper, and the lifting assembly is used to drive the mounting block to move on the hopper.

[0019] By adopting the above technical solution, when cutting waste plastic, the driving source is started to drive the first driving wheel and the second driving wheel to rotate, and then the driven wheel is driven to rotate through the corresponding driving belt. As the driven wheel rotates, the driving shaft can be driven to rotate, thereby driving the corresponding cutting roller to rotate, thereby realizing the cutting of the waste plastic. When adjusting the horizontal position of the cutting roller, while starting the first motor to drive the first screw to rotate, the Hengjiang component is started to drive the mounting block to move accordingly on the hopper. When the two cutting rollers approach each other, the mounting block moves downward on the hopper, and when the two cutting rollers move away from each other, the mounting block moves upward on the hopper, which can always keep the drive belt taut, thereby ensuring the drive of the driven wheel. By setting a driving source, the two cutting rollers can be driven to rotate synchronously, ensuring that the rotation speed of the two cutting rollers and the distance between the abutment part are the same, ensuring the same cutting effect of the plastic put into the hopper, and to a certain extent ensuring the quality and effect of subsequent grinding.

[0020] In some possible embodiments, a receiving groove is opened on the inner walls on both sides of the hopper along the axial direction of the cutting roller, a collection box is slidably arranged in the receiving groove along the length direction of the receiving groove, and an abutment plate is fixedly arranged on the collection box, and the end of the abutment plate away from the collection box is used to abut against the cutting roller, and the collection box is detachably connected to the hopper.

[0021] By adopting the above technical solution, after the cutting of the waste plastic is completed, the two cutting rollers are driven by the driving component to move toward the receiving groove, so that the abutment plate abuts against the cutting roller. At this time, the driving source is started to drive the cutting roller to rotate, and the abutment plate slides in the receiving groove driven by the spiral cutting blade on the surface of the cutting roller. In the above process, as the abutment plate moves, the nylon braided belt, plastic oil film, etc. wrapped around the cutting roller can be cleared, and the scraped nylon braided belt and plastic oil film fall into the collection box under the abutment plate. After cleaning, the collection box is removed from the hopper to recycle and organize the waste plastic in the collection box, thereby ensuring the cutting effect of the cutting roller when the device works next time.

[0022] In some possible embodiments, a buffer groove is opened at the top of the first sliding block along the length direction of the first sliding groove, a buffer block is slidably arranged in the buffer groove, the top of the buffer block is fixedly connected to the bottom of the strip block, and an elastic member is arranged in the buffer groove, and the elastic member acts on the strip block to drive the strip blocks to move in a direction away from each other.

[0023] By adopting the above technical solution, in the process of driving the cutting roller to move toward the accommodating groove, the first slider moves in the first slide groove, thereby driving the strip block to move, thereby driving the cutting roller to move. After the cutting roller abuts the abutment plate, the first slider continues to move in the first slide groove, and at this time the strip block cannot move because the cutting roller abuts the abutment plate, thereby driving the buffer block to move in the buffer groove and squeezing the elastic part, so that the elastic part is compressed to store elastic potential energy, and finally the cutting roller is tightly abutted with the abutment plate. At this time, as the cutting roller rotates, the waste plastic wrapped around the cutting roller can be effectively scraped and cleaned.

[0024] In some possible embodiments, a downwardly inclined feed pipe is provided at the bottom of the hopper, the other end of the feed pipe is connected to the freezer, the liquid nitrogen delivery assembly includes a liquid nitrogen source and a delivery pipe, the delivery pipe includes a top branch and a bottom branch, one end of the top branch is connected to the liquid nitrogen source, and the other end is connected to the top of the freezer, one end of the bottom branch is connected to the liquid nitrogen source, and the other end is connected to the bottom of the freezer.

[0025] By adopting the above technical solution, the cut plastic fragments leave the hopper through the feeding pipe and enter the freezing box. At this time, the liquid nitrogen source is turned on, and the liquid nitrogen used for freezing is input into the freezing box from the top of the freezing box through the top tube, and enters the freezing box from the bottom of the freezing box through the bottom branch pipe. In the freezing box, a liquid nitrogen freezing airflow is formed that flows up and down, which can quickly freeze the plastic fragments in the freezing box and improve the freezing efficiency.

[0026] In some possible embodiments, a blanking hole is opened at the bottom of the freezer, and a blanking plate for closing the blanking hole is slidably provided in the freezer, and the blanking hole is connected to a blanking pipe, and the other end of the blanking pipe is connected to the grinding box; the circulating air cooling component includes a cyclone separator, a filter dust collector and a cooler, a first return air duct is connected between the return air device and the cyclone separator, a second return air duct is connected between the cyclone separator and the filter dust collector, a third return air duct is connected between the filter dust collector and the cooler, and a fourth return air duct is connected between the cooler and the top of the grinding box.

[0027] By adopting the above technical solution, after the plastic fragments are frozen, the blanking plate is opened, and the plastic fragments enter the grinding box through the blanking pipe. The circulating air cooling component is turned on while the grinding box is started. While the plastic fragments are being ground, a circulating air-cooled air flow channel is formed in the grinding box. The air flow enters the first return air duct through the return air device and then enters the cyclone separator. The inhaled air flow is separated by the cyclone separator to separate the plastic powder that meets the grinding standards and the plastic powder that does not meet the standards is unified and regular. The air flow then enters the filter dust collector through the second return air duct to filter out the dust in the air flow, and then enters the cooler through the third return air duct to cool the air flow. The air flow that has completed cooling and cooling flows back into the grinding box through the fourth return air duct to perform circulating air cooling and cooling in the grinding box.

[0028] On the other hand, the present invention provides a method for processing waste plastic pulverizer for producing asphalt modifier.

[0029] A method for processing waste plastic pulverizer for asphalt modification and production, using a pulverizer, comprises the following steps:

[0030] The waste plastic is put into the hopper through the top of the hopper, and the spray component is started to spray a mixture of glycerol and liquid water on the waste plastic; the driving source is started to drive the cutting roller to rotate, and the waste plastic is preliminarily cut into plastic fragments; the plastic blocks pass through the hopper and enter the freezer through the feeding pipe, and the liquid nitrogen source is turned on and liquid nitrogen is transported through the delivery pipe to form a low-temperature environment of less than -40°C in the freezer, which quickly embrittles the plastic fragments and transforms the plastic fragments from a tough state to a brittle state; the blanking plate is opened, and the embrittled plastic fragments enter the grinding box through the blanking pipe, and the grinding box is started to grind the plastic fragments; the circulating air cooling component is turned on to cool the grinding box with air; the grinding box operates for 30-40 seconds to grind the plastic fragments into particles with a diameter of less than 1mm; the grinding box is opened to take out the plastic particles.

[0031] In summary, the technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0032] 1. By spraying a mixture of glycerin and water, static electricity on the plastic surface is effectively reduced and the material is initially softened. Combined with a bidirectional spiral cutting blade and adjustable spacing, it can accommodate waste plastics of varying hardness and size. The baffle structure prevents plastic chips from falling into the transmission mechanism, ensuring long-term stable operation of the system and creating a uniform material foundation for subsequent cryogenic embrittlement.

[0033] 2. Liquid nitrogen is injected into the freezer via the top and bottom branches, creating a convection low-temperature airflow that rapidly and evenly embrittles the plastic fragments. This embrittlement significantly reduces grinding energy consumption and prevents hot melt adhesion.

[0034] 3. The circulating air cooling component uses a cyclone separator to separate qualified particles, a filter dust collector to remove dust, and a cooler to recover and cool the air flow. This can effectively suppress the temperature rise during the grinding process, effectively reduce the plastic hot melt phenomenon during the plastic grinding process, and at the same time improve the uniformity and purity of the plastic powder;

[0035] 4. When cleaning the cutting roller, the elastic member causes the cutting roller to contact closely with the abutment plate. At this time, as the cutting roller rotates, the waste plastic wrapped around the cutting roller can be effectively scraped and cleaned. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of the internal structure of the hopper according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic structural diagram of a cutting assembly according to an embodiment of the present invention;

[0039] Figure 4 Schematic diagram of the structure of the driving assembly according to an embodiment of the present invention;

[0040] Figure 5 Schematic diagram of the structure of a driving source according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic structural diagram of a lifting assembly according to an embodiment of the present invention;

[0042] Figure 7 This is a schematic structural diagram of a receiving tank according to an embodiment of the present invention;

[0043] Figure 8 for Figure 7 A magnified view of part A in FIG;

[0044] Figure 9 Schematic diagram of the structure of the collection box and the abutment plate according to an embodiment of the present invention

[0045] Figure 10 A schematic structural diagram of a buffer tank according to an embodiment of the present invention;

[0046] Figure 11 This is a schematic structural diagram of a refrigeration device according to an embodiment of the present invention;

[0047] Figure 12 Schematic diagram of the structure of a grinding device according to an embodiment of the present invention.

[0048] Icons: 1. Feeding device; 11. Hopper; 12. Driving source; 13. Mounting cover; 14. Guide block; 15. Perforation; 16. Closing plate; 17. Bolt; 18. Feeding pipe; 101. Receiving slot; 102. Collection box; 103. Abutment plate; 104. Top plate; 105. Bottom plate; 106. T-slot; 107. T-block; 108. Magnetic plug; 109. Slot; 2. Refrigeration device; 21. Refrigeration box; 22. Liquid nitrogen delivery assembly; 221. Liquid nitrogen source; 222. Delivery pipe; 223. Top branch pipe; 224. Bottom branch pipe; 23. Dropping hole; 24. Dropping plate; 25. Dropping pipe; 3. Grinding device; 31. Grinding box; 32. Circulating air cooling assembly; 321. Cyclone separator; 322. Filter dust collector; 323. Cooler; 3 24. First return air duct; 325. Second return air duct; 326. Third return air duct; 327. Fourth return air duct; 33. Return air device; 4. Spray assembly; 41. Spray pipe; 42. Spray head; 5. Cutting assembly; 51. Cutting roller; 52. Abutment portion; 53. Cutting blade; 54. Abutment blade groove; 6. Driving assembly; 61. First lead screw; 62. First motor; 63. First slide groove; 64. First slider; 7. Strip hole; 71. Strip block; 72. Baffle; 73. Drive shaft; 74. Driven wheel; 75. Mounting block; 76. Mounting shaft; 77. First drive wheel; 78. Second drive wheel; 79. Drive belt; 8. Lifting assembly; 81. Second lead screw; 82. Second motor; 83. Second slide groove; 9. Buffer groove; 91. Buffer block; 92. Elastic member. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0050] The following reference Figures 1 to 12 The present invention is described in further detail.

[0051] In one aspect, the present invention provides a waste plastic pulverizer for producing asphalt modifiers.

[0052] Reference Figure 1 , including a feeding device 1, a freezing device 2 and a grinding device 3 which are interconnected.

[0053] Reference Figure 2 The feeding device 1 includes a hopper 11 , the top of the hopper 11 is opened, a spray assembly 4 is provided at the top opening of the hopper 11 , a cutting assembly 5 is provided in the hopper 11 , and the cutting assembly 5 is located below the spray assembly 4 .

[0054] Reference Figure 1 The freezing device 2 includes a freezing box 21 and a liquid nitrogen delivery component 22 . The freezing box 21 is connected to the hopper 11 , and the output end of the liquid nitrogen delivery component 22 is connected to the freezing box 21 .

[0055] Reference Figure 1 The grinding device 3 includes a grinding box 31 and a circulating air cooling component 32. The grinding box 31 is connected to the end of the freezing box 21 away from the hopper 11. The output end of the circulating air cooling component 32 is arranged at the top of the grinding box 31. A return air device 33 is provided on the bottom wall of the grinding box 31. The return air device 33 is connected to the input end of the circulating air cooling component 32.

[0056] Reference Figure 2 and Figure 3 The cutting assembly 5 includes a cutting roller 51 and an abutment portion 52. The abutment portion 52 is fixedly arranged in the hopper 11. There are two cutting rollers 51, which are arranged on both sides of the abutment portion 52. The two cutting rollers 51 are provided with spiral cutting blades 53 with opposite rotation directions. Abutment blade grooves 54 that are adapted to the cutting blades 53 are opened on both sides of the abutment portion 52.

[0057] In actual use, the two cutting rollers 51 rotate in opposite directions. Figure 3 The position in the figure is for reference only. During the process of cutting the plastic, the cutting roller 51 on the left rotates clockwise and the cutting roller 51 on the right rotates counterclockwise. When waste plastic is put into the hopper 11, after the waste plastic contacts the surface of the cutting roller 51, the top of the cutting roller 51 is deflected toward the abutment 52. Therefore, the waste plastic will move toward the direction of contact between the cutting roller 51 and the abutment 52 under its own gravity and the drive of the cutting roller 51. Then, the waste plastic can be cut by the cutting blade 53 and the abutment blade groove 54.

[0058] Reference Figure 1 and Figure 2 As an embodiment of the present invention, the spray assembly 4 includes a spray pipe 41 and a nozzle 42. Two spray pipes 41 are provided. The two spray pipes 41 are respectively arranged above the two cutting rollers 51. Each spray pipe 41 is connected to a plurality of nozzles 42. The plurality of nozzles 42 are evenly arranged along the length direction of the spray pipe 41. The nozzles 42 are inclined 30-45 degrees toward the gap between the cutting roller 51 and the abutting portion 52.

[0059] During actual use, the spray pipe 41 is connected to an external liquid source through a water inlet pipe. The liquid in the liquid source is a mixture of liquid water and glycerin. When cutting waste plastics, especially when cutting nylon braids and plastic oil films (PP / PE), by spraying the mixture of liquid water and glycerin, the toughness of the nylon braids and plastic oil films can be effectively reduced, thereby effectively reducing the entanglement of the nylon braids and plastic oil films with the cutting roller 51, thereby ensuring that during a long working process, the cutting blade 53 on the cutting roller 51 always has a good cutting effect on the plastic.

[0060] Reference Figure 4 and Figure 5 A driving assembly 6 is provided on the hopper 11, and the driving assembly 6 is used to drive the two cutting rollers 51 to move toward or away from each other. A driving source 12 is provided on the hopper 11 for driving the cutting rollers 51 to rotate.

[0061] Reference Figure 4 and Figure 5 As an embodiment of the present invention, the driving assembly 6 includes a first screw 61 and a first motor 62. A first slide groove 63 is opened on the hopper 11. The first screw 61 is rotatably set in the first slide groove 63. The first motor 62 is set on the hopper 11. The output shaft of the first motor 62 is transmission-connected to the first screw 61. Two first sliders 64 are slidingly arranged in the first slide groove 63. The two first sliders 64 are connected to the two cutting rollers 51 one by one. The first sliders 64 are threadedly sleeved on both ends of the first screw 61.

[0062] Reference Figure 4 and Figure 5 As an embodiment of the present invention, the first lead screw 61 is configured as a bidirectional lead screw, that is, spiral grooves with opposite rotation directions are opened at both ends of the first lead screw 61, and two first sliders 64 are threadedly sleeved on both ends of the first lead screw 61. As the first lead screw 61 rotates, the two first sliders 64 can be driven to move toward or away from each other.

[0063] Reference Figure 4 and Figure 5 Two strip holes 7 are opened horizontally on the inner wall of the hopper 11, and a strip block 71 is slidably arranged in the strip hole 7. The cutting roller 51 is rotatably set on the strip block 71. The top of the first chute 63 is connected to the bottom of the strip hole 7. The strip block 71 is connected to the first slider 64 in a one-to-one correspondence. A baffle 72 is fixedly provided on the inner wall of the hopper 11. The baffle 72 is set at the orifice of the strip hole 7. The baffle 72 slides and contacts with the side wall of the strip block 71 near the cutting roller 51.

[0064] Reference Figure 5 and Figure 6The cam 76 is fixed on the top of the cam 76 and the cam 77 is fixed on the top of the cam 76 to move the cam 76 to the left.

[0065] As another possible embodiment of the present invention, the driven wheel 74, the first driving wheel 77 and the second driving wheel 78 can all be configured as gears, and in this case the driving belt 79 can be configured as a chain.

[0066] Reference Figure 6 A lifting assembly 8 is provided on the hopper 11. The lifting assembly 8 is used to drive the mounting block 75 to move on the hopper 11. As one embodiment of the present invention, the lifting assembly 8 includes a second motor 82 and a second lead screw 81. A second chute 83 is vertically provided on the outer wall of the hopper 11. The mounting block 75 is slidably disposed in the second chute 83. The second motor 82 is fixedly disposed on the hopper 11. The second lead screw 81 is rotatably disposed in the second chute 83 in the vertical direction. The mounting block 75 is threadedly sleeved on the second lead screw 81. The second lead screw 81 is coaxially and fixedly connected to the output shaft of the second motor 82.

[0067] As an embodiment of the present invention, the driving source 12 is configured as a driving motor, and the output shaft of the driving motor is transmission-connected to the mounting shaft 76. The driving motor is configured as a dual-axis motor, that is, the output shaft of the driving motor is connected to two coaxial rotating shafts, and the two rotating shafts are transmission-connected by a planetary gear mechanism, thereby being able to drive the two rotating shafts to rotate coaxially in opposite directions (this is the prior art, and the specific structure will not be repeated).

[0068] As an embodiment of the present invention, the driving motor drives the first driving wheel 77 and the second driving wheel 78 to rotate coaxially and in opposite directions in the above manner, thereby achieving the purpose of driving the cutting roller 51 to rotate.

[0069] At the same time, refer to Figure 6 and Figure 7A mounting cover 13 is fixedly provided on the outer wall of the hopper 11, and the mounting cover 13 covers the driven wheel 74, the first driving wheel 77, the second driving wheel 78 and the driving source 12. Figure 6 A guide block 14 is fixedly provided on the driving source 12, and a guide groove (not shown in the figure) for the sliding connection of the guide block 14 is opened in the vertical direction on the inner wall of the mounting cover 13, so that the driving source 12 can still drive the first driving wheel 77 and the second driving wheel 78 to rotate during the up and down movement.

[0070] Reference Figure 7 and Figure 8 On the inner walls on both sides of the hopper 11, a receiving groove 101 is opened along the axial direction of the cutting roller 51. A collection box 102 is slidably arranged in the receiving groove 101 along the length direction of the receiving groove 101. An abutment plate 103 is fixedly arranged on the collection box 102, and the end of the abutment plate 103 away from the collection box 102 is used to abut against the cutting roller 51.

[0071] After completing the cutting of the waste plastic, the two cutting rollers 51 are driven by the driving component 6 to move toward the receiving groove 101, so that the abutment plate 103 abuts against the cutting roller 51. At this time, the driving source 12 is started to drive the cutting roller 51 to rotate, and the abutment plate 103 slides in the receiving groove 101 driven by the spiral cutting blade 53 on the surface of the cutting roller 51. In the above process, as the abutment plate 103 moves, the nylon braid, plastic oil film, etc. wrapped around the cutting roller 51 can be cleared, and the scraped nylon braid and plastic oil film fall into the collection box 102 below the abutment plate 103.

[0072] Reference Figure 7 A top plate 104 and a bottom plate 105 are fixedly provided on the inner wall of the hopper 11 along the length direction of the cutting roller 51. There are two top plates 104 and two bottom plates 105, and the space between the top plate 104 and the bottom plate 105 on the same side forms a receiving groove 101.

[0073] Reference Figure 7 、 Figure 8 and Figure 9 The collection box 102 is detachably connected to the hopper 11 , a T-shaped slot 106 is provided at the top of the bottom plate 105 along the length direction of the bottom plate 105 , and a T-shaped block is provided at the bottom of the collection box 102 , and the T-shaped block is slidably provided in the T-shaped slot 106 .

[0074] Reference Figure 9 A magnetic plug 108 is fixedly provided on the top of the T-shaped block, a slot 109 for inserting the magnetic plug 108 is provided at the bottom of the collection box 102, and a magnetic sheet (not shown in the figure) is provided on the inner wall of the slot 109.

[0075] Reference Figure 7 and Figure 8 A through hole 15 is provided on the side wall of the hopper 11, and the through hole 15 is connected to the receiving groove 101. A sealing plate 16 is provided on the side wall of the hopper 11, and the sealing plate 16 is used to close the through hole 15. The sealing plate 16 is detachably connected to the hopper 11 through bolts 17.

[0076] During actual use, when the collection box 102 needs to be disassembled, the bolt 17 is unscrewed to remove the sealing plate 16, and then the staff removes the collection box 102 from the strip block 71 through the perforation 15. The operation is convenient, simple and quick.

[0077] Reference Figure 5 and Figure 10 A buffer groove 9 is provided at the top of the first slider 64 along the length direction of the first slide groove 63. A buffer block 91 is slidably provided in the buffer groove 9. The top of the buffer block 91 is fixedly connected to the bottom of the strip block 71. An elastic member 92 is provided in the buffer groove 9. The elastic member 92 acts on the strip block 71 to drive the strip blocks 71 to move in a direction away from each other.

[0078] As an embodiment of the present invention, refer to Figure 10 The elastic member 92 is configured as a compression spring, one end of the elastic member 92 is fixedly connected to the side wall of the buffer block 91 , and the other end is fixedly connected to the inner wall of the buffer groove 9 .

[0079] Reference Figure 11 A downwardly inclined feeding pipe 18 is provided at the bottom of the hopper 11, and the other end of the feeding pipe 18 is connected to the freezing chamber 21. The liquid nitrogen delivery assembly 22 includes a liquid nitrogen source 221 and a delivery pipe 222. The delivery pipe 222 includes a top branch pipe 223 and a bottom branch pipe 224. One end of the top branch pipe 223 is connected to the liquid nitrogen source 221, and the other end is connected to the top of the freezing chamber 21. One end of the bottom branch pipe 224 is connected to the liquid nitrogen source 221, and the other end is connected to the bottom of the freezing chamber 21.

[0080] The cut plastic fragments leave the hopper 11 through the feeding pipe 18 and enter the freezing box 21. At this time, the liquid nitrogen source 221 is turned on, and the liquid nitrogen used for freezing is input into the freezing box 21 from the top through the top tube, and enters the freezing box 21 from the bottom through the bottom branch pipe 224. In the freezing box 21, a liquid nitrogen freezing airflow is formed that flows upward and downward, which can quickly freeze the plastic fragments in the freezing box 21 and improve the freezing efficiency.

[0081] Reference Figure 11 and Figure 12 A blanking hole 23 is provided at the bottom of the freezing box 21 , and a blanking plate 24 is slidably provided in the freezing box 21 for closing the blanking hole 23 . The blanking hole 23 is connected to a blanking pipe 25 , and the other end of the blanking pipe 25 is connected to the grinding box 31 .

[0082] Reference Figure 12 The circulating air cooling assembly 32 includes a cyclone separator 321, a filter dust collector 322, and a cooler 323. A first return air duct 324 is connected between the return air collector 33 and the cyclone separator 321, a second return air duct 325 is connected between the cyclone separator and the filter dust collector 322, a third return air duct 326 is connected between the filter dust collector 322 and the cooler 323, and a fourth return air duct 327 is connected between the cooler 323 and the top of the grinding box 31. As one embodiment of the present invention, fans are integrated into the cyclone separator 321 and the cooler 323.

[0083] After the plastic fragments are frozen, the blanking plate 24 is opened, and the plastic fragments enter the grinding box 31 through the blanking pipe 25. The circulating air cooling component 32 is turned on while the grinding box 31 is started. While the plastic fragments are being ground, a circulating air-cooled air flow channel is formed in the grinding box 31. The air flow enters the first return air duct 324 through the return air device 33, and then enters the cyclone separator 321. The inhaled air flow is separated by the cyclone separator 321, and the plastic powder that meets the grinding standards is separated, and the plastic powder that does not meet the standards is unified and regular. The air flow then enters the filter dust collector 322 through the second return air duct 325 to filter out dust in the air flow, and then enters the cooler 323 through the third return air duct 326 to cool the air flow. The air flow that has completed cooling and cooling flows back into the grinding box 31 through the fourth return air duct 327 to perform circulating air cooling and cooling in the grinding box 31.

[0084] On the other hand, the present invention provides a method for processing waste plastic pulverizer for producing asphalt modifier.

[0085] A method for processing waste plastic pulverizer for asphalt modification and production, using the above pulverizer, comprises the following steps:

[0086] The waste plastic is put into the hopper 11 through the top of the hopper 11, and the spray component 4 is started to spray the glycerin and liquid water mixture on the waste plastic;

[0087] The driving source 12 is started to drive the cutting roller 51 to rotate, and the waste plastic is initially cut into plastic fragments;

[0088] The plastic blocks pass through the hopper 11 and the feeding pipe 18 into the freezing chamber 21. The liquid nitrogen source 221 is turned on and liquid nitrogen is fed through the feeding pipe 222. A low temperature environment of less than -40°C is formed in the freezing chamber 21, which quickly embrittles the plastic blocks, transforming them from a tough state to a brittle state.

[0089] Open the blanking plate 24, and the brittle plastic fragments enter the grinding box 31 through the blanking pipe 25, and start the grinding box 31 to grind the plastic fragments;

[0090] Open the circulating air cooling component 32 to cool the grinding box 31;

[0091] The grinding box 31 operates for 30-40 seconds to grind the plastic fragments into particles with a diameter of less than 1 mm;

[0092] Open the grinding box 31 and take out the plastic particles.

[0093] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A waste plastic grinding machine for producing asphalt modifier, characterized by: It comprises a feeding device (1), a freezing device (2) and a grinding device (3) which are interconnected; The feeding device (1) comprises a hopper (11), the top of the hopper (11) is provided with an opening, a spray assembly (4) is provided at the top opening of the hopper (11), a cutting assembly (5) is provided in the hopper (11), and the cutting assembly (5) is located below the spray assembly (4); The freezing device (2) comprises a freezing box (21) and a liquid nitrogen delivery assembly (22), wherein the freezing box (21) is in communication with the hopper (11), and the output end of the liquid nitrogen delivery assembly (22) is in communication with the freezing box (21); The grinding device (3) comprises a grinding box (31) and a circulating air cooling assembly (32), wherein the grinding box (31) is connected to an end of the freezing box (21) away from the hopper (11), the output end of the circulating air cooling assembly (32) is arranged at the top of the grinding box (31), and an air return device (33) is arranged on the inner bottom wall of the grinding box (31), and the air return device (33) is connected to the input end of the circulating air cooling assembly (32).

2. The waste plastic grinding machine for producing asphalt modifier according to claim 1, characterized in that: The cutting assembly (5) comprises a cutting roller (51) and an abutting portion (52). The abutting portion (52) is fixedly arranged in the hopper (11). Two cutting rollers (51) are provided. The two cutting rollers (51) are respectively arranged on both sides of the abutting portion (52). The two cutting rollers (51) are provided with spiral cutting blades (53) with opposite rotation directions. Abutting blade grooves (54) that are mutually adapted to the cutting blades (53) are provided on both sides of the abutting portion (52). A driving assembly (6) is provided on the hopper (11). The driving assembly (6) is used to drive the two cutting rollers (51) to move toward or away from each other. A driving source (12) for driving the cutting rollers (51) to rotate is provided on the hopper (11).

3. The waste plastic grinding machine for producing asphalt modifier according to claim 2, characterized in that: The driving assembly (6) includes a first lead screw (61) and a first motor (62). A first chute (63) is provided on the hopper (11). The first lead screw (61) is rotatably arranged in the first chute (63). The first motor (62) is provided on the hopper (11). The output shaft of the first motor (62) is transmission-connected to the first lead screw (61). Two first sliders (64) are slidingly arranged in the first chute (63). The two first sliders (64) are connected to the two cutting rollers (51) in a one-to-one correspondence. The first sliders (64) are threadedly sleeved on both ends of the first lead screw (61).

4. The waste plastic grinding machine for producing asphalt modifier according to claim 3, characterized in that: Two strip holes (7) are provided on the inner wall of the hopper (11) in a horizontal direction. A strip block (71) is slidably provided in the strip hole (7). The cutting roller (51) is rotatably provided on the strip block (71). The top of the first chute (63) is connected to the bottom of the strip hole (7). The strip block (71) is connected to the first slider (64) in a one-to-one correspondence. A baffle (72) is fixedly provided on the inner wall of the hopper (11). The baffle (72) is provided at the opening of the strip hole (7). The baffle (72) is in sliding contact with the side wall of the strip block (71) close to the cutting roller (51).

5. The waste plastic grinding machine for producing asphalt modifier according to claim 4, characterized in that: A driving shaft (73) is rotatably provided on each bar block (71), one end of the driving shaft (73) is fixedly connected to the cutting roller (51), and the other end extends out of the hopper (11). A driven wheel (74) is coaxially fixedly provided at one end of each driving shaft (73) away from the cutting roller (51). A mounting block (75) is slidably provided on the outer wall of the hopper (11) in a vertical direction. The mounting block (75) is located in the middle of the two bar blocks (71). A mounting shaft (76) is rotatably provided on the mounting block (75). A first driving wheel (77) and a second driving wheel (78) are sequentially provided on the mounting shaft (76) along the axial direction of the mounting shaft (76). A second driving wheel (78) is provided with a driving belt (79) wound around the first driving wheel (77) and the second driving wheel (78), the other end of the driving belt (79) on the first driving wheel (77) is wound around the driven wheel (74) on the left, and the other end of the driving belt (79) on the second driving wheel (78) is wound around the driven wheel (74) on the right. The driving source (12) is used to drive the first driving wheel (77) and the second driving wheel (78) to rotate in opposite directions. A lifting assembly (8) is provided on the hopper (11), and the lifting assembly (8) is used to drive the mounting block (75) to move on the hopper (11).

6. The waste plastic grinding machine for producing asphalt modifier according to claim 4, characterized in that: An accommodating groove (101) is provided on the inner walls on both sides of the hopper (11) along the axial direction of the cutting roller (51). A collection box (102) is slidably provided in the accommodating groove (101) along the length direction of the accommodating groove (101). An abutment plate (103) is fixedly provided on the collection box (102). An end of the abutment plate (103) away from the collection box (102) is used to abut against the cutting roller (51). The collection box (102) is detachably connected to the hopper (11).

7. The waste plastic grinding machine for producing asphalt modifier according to claim 6, characterized in that: A buffer groove (9) is provided at the top of the first sliding block (64) along the length direction of the first sliding groove (63), a buffer block (91) is slidably provided in the buffer groove (9), the top of the buffer block (91) is fixedly connected to the bottom of the strip block (71), and an elastic member (92) is provided in the buffer groove (9), the elastic member (92) acts on the strip block (71) to drive the strip blocks (71) to move in a direction away from each other.

8. The waste plastic grinding machine for producing asphalt modifier according to claim 1, characterized in that: A downwardly inclined feeding pipe (18) is provided at the bottom of the hopper (11), the other end of the feeding pipe (18) being in communication with the freezing chamber (21), the liquid nitrogen delivery assembly (22) comprising a liquid nitrogen source (221) and a delivery pipe (222), the delivery pipe (222) comprising a top branch pipe (223) and a bottom branch pipe (224), one end of the top branch pipe (223) being in communication with the liquid nitrogen source (221), and the other end being in communication with the top of the freezing chamber (21), the one end of the bottom branch pipe (224) being in communication with the liquid nitrogen source (221), and the other end being in communication with the bottom of the freezing chamber (21).

9. The waste plastic grinding machine for producing asphalt modifier according to claim 8, characterized in that: A blanking hole (23) is provided at the bottom of the freezing box (21), a blanking plate (24) is slidably provided in the freezing box (21) for closing the blanking hole (23), the blanking hole (23) is connected to a blanking pipe (25), and the other end of the blanking pipe (25) is connected to the grinding box (31); The circulating air cooling component (32) includes a cyclone separator (321), a filter dust collector (322), and a cooler (323); a first return air duct (324) is connected between the return air device (33) and the cyclone separator (321); a second return air duct (325) is connected between the cyclone separator and the filter dust collector (322); a third return air duct (326) is connected between the filter dust collector (322) and the cooler (323); and a fourth return air duct (327) is connected between the cooler (323) and the top of the grinding box (31).

10. A method for processing asphalt modification and production of waste plastic grinding machine, characterized in that, The process of using a pulverizer according to any one of claims 1 to 9 comprises the following steps: The waste plastic is put into the hopper (11) through the top of the hopper (11), and the spray component (4) is started to spray the waste plastic with a mixture of glycerol and liquid water; Starting the driving source (12) to drive the cutting roller (51) to rotate, thereby preliminarily cutting the waste plastic into plastic fragments; The plastic blocks pass through the hopper (11) and the feeding pipe (18) into the freezing chamber (21). The liquid nitrogen source (221) is turned on and the liquid nitrogen is fed through the feeding pipe (222). A low temperature environment of less than -40°C is formed in the freezing chamber (21), which rapidly embrittles the plastic blocks, causing the plastic blocks to change from a tough state to a brittle state. The blanking plate (24) is opened, and the brittle plastic fragments enter the grinding box (31) through the blanking pipe (25), and the grinding box (31) is started to grind the plastic fragments; Open the circulating air cooling component (32) to cool the grinding box (31) with air; The grinding box (31) operates for 30-40 seconds to grind the plastic fragments into particles with a diameter of less than 1 mm; Open the grinding box (31) and take out the plastic particles.

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