Fine cleaning system for food-grade plastic sheets

Abstract

The invention discloses a fine cleaning system for food-grade plastic sheets. A main rack is divided into an upper layer area and a lower layer area through a separation layer; two hot washing pots are arranged in the upper layer area, a separating and filtering bin is arranged in the lower layer area, and material output ports of the two hot washing pots are both communicated with a material feeding port of the separating and filtering bin; horizontal material distributing and conveying equipment is also arranged; the horizontal material distributing and conveying device is characterized in that a feeding port, a left discharging port with a left discharging valve and a right discharging port with a right discharging valve are formed in a material distributing barrel arranged above the two hot washing pots through a second rack, an outlet of the left discharging valve is communicated with a feeding port of the left hot washing pot, and an outlet of the right discharging valve is communicated with a discharging port of the right hot washing pot. An outlet of the right blanking valve is communicated with a feeding hole of the right hot washing pot; a material distributing and conveying device used for conveying materials entering from the feeding opening to the left discharging opening and the right discharging opening is arranged in an inner cavity of the material distributing barrel. The system has the advantages of being high in layout space utilization rate, convenient to integrate and manage, high in hot washing efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of recycling and reuse of waste plastics, and particularly to a fine washing system for food-grade plastic sheets. Background Art

[0002] In the production line for recycling and reuse of waste plastics, waste plastics such as waste plastic bottles and waste plastic shells need to go through multiple processes including sorting, crushing, cleaning, dehydration, air separation, and finished product bagging. Among these processes, cleaning is an important link in the production line for recycling and reuse of waste plastics, and the cleaning effect has a significant impact on the quality of the plastics produced subsequently.

[0003] The cleaning is divided into pre-cleaning and hot washing. First, the crushed waste plastics are pre-cleaned to remove impurities such as dust, soil, and sand on the surface of the waste plastics; then the waste plastics are hot-washed, and an appropriate amount of hot water and detergent are added. For the convenience of description, the mixed liquid of hot water and detergent is called the cleaning liquid. The cleaning liquid is heated to a certain temperature and maintained for a period of time, and at the same time, stirring is carried out to further remove stubborn stains and residues on the surface of the waste plastics.

[0004] Hot washing is also called fine washing. In the fine washing system for food-grade plastic sheets, among them, how to improve the cleaning efficiency is the most concerned issue in the fine washing system for food-grade plastic sheets and is also an issue that needs to be solved urgently at present. In addition, the waste plastics output after fine washing contain powder, and the presence of the powder will affect the dehydration efficiency of the subsequent centrifugal dehydrator, and further affect the quality of the plastics produced subsequently. Therefore, in the fine washing system for food-grade plastic sheets, it is necessary to develop and configure a coarse filtration device that can first perform water-material separation and powder separation on the waste plastics after hot washing. After preliminary filtration by the coarse filtration device, it is sent to the subsequent dehydrator for dehydration treatment, which can greatly improve the dehydration efficiency and dehydration effect, and further improve the quality of the plastics produced subsequently. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to provide a fine washing system for food-grade plastic sheets with a compact structure layout, small lateral space occupation, high cleaning efficiency, and a coarse filtration function.

[0006] For the convenience of description, the waste plastics that need to be finely washed in this solution are collectively referred to as materials. Currently, in the fine washing system for food-grade plastic sheets, there are generally problems such as low cleaning efficiency during hot washing and the powder contained in the materials after hot washing affecting the dehydration efficiency and dehydration effect of the subsequent dehydrator. In view of this problem, the technical solution of the present invention is: the fine washing system for food-grade plastic sheets includes: a general frame, the general frame has a partition layer, and the partition layer divides the general frame into upper and lower two-layer areas: an upper layer area and a lower layer area; There are two hot - washing pots for hot - washing materials in the upper - layer area: the left hot - washing pot and the right hot - washing pot. Both hot - washing pots are arranged on the partition layer through their respective corresponding first racks. Among them, the optimal layout of the two hot - washing pots is that they are arranged in sequence from left to right. There is a separation and filtration bin for filtering materials in the lower - layer area. The material output ports of the two hot - washing pots are both connected to the material feeding port of the separation and filtration bin. A horizontal material - distributing and conveying device is also provided in the food - grade plastic sheet fine - washing system. The structure of the horizontal material - distributing and conveying device includes: a horizontally - lying material - distributing cylinder body. The material - distributing cylinder body is arranged above the two hot - washing pots through a second rack. At the center of the top of the material - distributing cylinder body, there is a feeding port communicating with the inner cavity of the material - distributing cylinder body. At the left end of the bottom of the material - distributing cylinder body, there is a left discharging port communicating with the inner cavity of the material - distributing cylinder body. At the left discharging port, there is a left discharging valve, and the outlet of the left discharging valve is connected to the feeding port of the left hot - washing pot. At the right end of the bottom of the material - distributing cylinder body, there is a right discharging port communicating with the inner cavity of the material - distributing cylinder body. At the right discharging port, there is a right discharging valve, and the outlet of the right discharging valve is connected to the feeding port of the right hot - washing pot. In the inner cavity of the material - distributing cylinder body, there is a material - distributing and conveying device for sending the materials entering from the feeding port to the left discharging port and the right discharging port respectively.

[0007] Vertically distributing the horizontal material - distributing and conveying device, hot - washing pots, and separation and filtration bin in space can not only improve the utilization rate of vertical space, but also reduce the occupation rate of horizontal space, improve the overall space utilization rate, and make the overall structure more compact and more convenient for integrated management.

[0008] Further, in the aforementioned food - grade plastic sheet fine - washing system, the structure of the material - distributing and conveying device includes: a material - distributing screw. The material - distributing screw is supported in the inner cavity of the material - distributing cylinder body through a first bearing group, and the material - distributing screw is driven to rotate by a first driving device. A first continuous spiral blade is arranged from the left end of the material - distributing screw to the section where the center of the material - distributing screw is located, and a second continuous spiral blade is arranged from the right end of the material - distributing screw to the section where the center of the material - distributing screw is located; or a number of first discontinuous spiral blades are evenly spaced along the left - hand spiral track from the left end of the material - distributing screw to the section where the center of the material - distributing screw is located, and a number of second discontinuous spiral blades are evenly spaced along the right - hand spiral track from the right end of the material - distributing screw to the section where the center of the material - distributing screw is located. The rotation direction of the first continuous spiral blade is opposite to that of the second continuous spiral blade, or the rotation direction of the left spiral line is opposite to that of the right spiral line, so that when the material distribution screw is driven to rotate by the first driving device, the material in the inner cavity of the material distribution cylinder can be conveyed from the center to the left and right lower discharge ports on both sides; A feeding hopper is arranged at the feeding port of the material distribution cylinder, and a spiral conveyor for feeding is arranged on the frame. The outlet of the spiral conveyor for feeding is connected to the inlet of the feeding hopper.

[0009] The material conveyed from the previous process is distributed by the material distribution and conveying device, and the material is respectively sent to two hot washing pots, and the hot washing is carried out by the two hot washing pots to improve the hot washing efficiency.

[0010] In addition to the above structure, the material distribution and conveying device can also be the following structure: The structure of the material distribution and conveying device includes: a left material distribution screw and a right material distribution screw; The left material distribution screw is supported by a left bearing group and arranged in the left part of the inner cavity of the material distribution cylinder, and the left material distribution screw is driven to rotate by a left driving device; The right material distribution screw is supported by a right bearing group and arranged in the right part of the inner cavity of the material distribution cylinder, and the right material distribution screw is driven to rotate by a right driving device; A left continuous spiral blade is arranged on the left material distribution screw and a right continuous spiral blade is arranged on the right material distribution screw; or a number of left discontinuous spiral blades are evenly spaced along the left spiral line trajectory on the left material distribution screw and a number of right discontinuous spiral blades are evenly spaced along the right spiral line trajectory on the right material distribution screw; When the left material distribution screw rotates driven by the left driving device, it can convey the material in the inner cavity of the material distribution cylinder from the center to the left lower discharge port, and when the right material distribution screw rotates driven by the right driving device, it can convey the material in the inner cavity of the material distribution cylinder from the center to the right lower discharge port.

[0011] Furthermore, in the aforementioned food-grade plastic sheet fine washing system, in this solution, adding one more hot washing pot is adopted to improve the cleaning efficiency. However, the number of hot washing pots is not necessarily the more the better. Comprehensive factors such as the cost of the hot washing pot itself and the material-carrying capacity of the subsequent supporting equipment also need to be considered. Therefore, two hot washing pots are the best choice here.

[0012] In addition, in order to further improve the hot washing efficiency and hot washing effect of the hot washing pot, the structure of the hot washing pot is designed in this solution. The specific structure is as follows. The structure of the hot washing pot includes: a hot washing cylinder horizontally arranged on the first frame, and a detergent adding system for adding detergent into the inner cavity of the hot washing cylinder is arranged on the hot washing cylinder; A hot water inlet communicating with the inner cavity of the hot washing cylinder is provided on the hot washing cylinder; A feeding port communicating with the inner cavity of the hot washing cylinder is provided at the center of the top of the hot washing cylinder; A discharging port communicating with the inner cavity of the hot washing cylinder is provided at the center of the bottom of the hot washing cylinder. A discharging valve is installed at the discharging port, and the outlet of the discharging valve is the material output port of the hot washing pot; Side slag cleaning ports communicating with the inner cavity of the hot washing cylinder are respectively provided at the left and right ends of the bottom of the hot washing cylinder. Side slag cleaning valves are installed at each side slag cleaning port; The stirring shaft is supported in the inner cavity of the hot washing cylinder through a second bearing group, and the stirring shaft is driven by a second driving device to rotate forward or backward; A first feeding and stirring structure with stirring and feeding functions is provided on the left part of the stirring shaft, and a second feeding and stirring structure with stirring and feeding functions is provided on the right part of the stirring shaft; and when the stirring shaft rotates, the feeding directions of the first feeding and stirring structure and the second feeding and stirring structure are opposite.

[0013] Further, for the aforesaid food-grade plastic sheet fine washing system, the first feeding and stirring structure is: a plurality of first intermittent spiral blades are arranged at intervals along a first spiral line trajectory on the stirring shaft from the central position of the stirring shaft to the left side direction, and a plurality of first pear-shaped knives are arranged at intervals along the first spiral line trajectory on the stirring shaft from the central position of the stirring shaft to the left side direction; The second feeding and stirring structure is: a plurality of second intermittent spiral blades are arranged at intervals along a second spiral line trajectory on the stirring shaft from the central position of the stirring shaft to the right side direction, and a plurality of second pear-shaped knives are arranged at intervals along the second spiral line trajectory on the stirring shaft from the central position of the stirring shaft to the right side direction; And the rotation directions of the first spiral line trajectory and the second spiral line trajectory are opposite.

[0014] During the hot washing process, the optimal ratio of the materials and the cleaning liquid in the hot washing cylinder is: the materials account for two-thirds, and the cleaning liquid mixed with the washing liquid and hot water accounts for one-third. The materials are stirred and hot washed at a temperature of 85 - 90 °C.

[0015] The feeding process of the hot washing pot is: when the stirring shaft rotates, the conveying direction of the first feeding and stirring structure is from the center of the inner cavity of the hot washing cylinder to the left side, and the conveying direction of the second feeding and stirring structure is from the center of the inner cavity of the hot washing cylinder to the right side. The materials enter the middle part of the inner cavity of the hot washing cylinder through the feeding port, and then are dispersed, turned and conveyed to the left and right sides through the first feeding and stirring structure and the second feeding and stirring structure; The discharging process of the hot washing pot is as follows: The rotation direction of the stirring shaft is opposite to that during feeding, so that the conveying direction of the first feeding and stirring structure is from the left side to the center of the inner cavity of the hot washing cylinder, and the conveying direction of the second feeding and stirring structure is from the right side to the center of the inner cavity of the hot washing cylinder. The materials are turned and gathered from the left and right sides to the center. Then, the discharge valve is opened, and the materials mixed with the cleaning liquid are discharged through the discharge valve. The slag cleaning process of the hot washing pot is as follows: The rotation direction of the stirring shaft is the same as that during feeding, so that the conveying direction of the first feeding and stirring structure is from the center to the left side of the inner cavity of the hot washing cylinder, and the conveying direction of the second feeding and stirring structure is from the center to the right side of the inner cavity of the hot washing cylinder. The residues are shoveled out by the first plow knife and the second plow knife and pushed to the side slag cleaning openings on the left and right sides respectively, and the slag is discharged through the side slag cleaning valves on the left and right sides.

[0016] Further, in the aforementioned food-grade plastic sheet fine washing system, in order to improve the slag cleaning effect, a purging structure is designed on the basis of the above structure. Specifically: The stirring shaft is a hollow shaft structure with a central channel, and a number of air blowing holes communicating with the central channel are arranged at intervals on the circumferential side wall of the stirring shaft; One end of the stirring shaft is driven by a second driving device, and a rotary valve for connecting a compressed air pipeline to make the compressed air pipeline communicate with the central channel is arranged at the other end of the stirring shaft.

[0017] During the process of cleaning the inner cavity of the hot washing cylinder, compressed air is introduced into the compressed air pipeline. The compressed air enters the central channel through the compressed air pipeline and the rotary valve, and then is sprayed into the inner cavity of the hot washing cylinder through each air blowing hole to purge the inner cavity of the hot washing cylinder. The above method can improve the slag cleaning efficiency and effect by shoveling up the residues with the plow knife and cooperating with the compressed air purging.

[0018] Further, in the aforementioned food-grade plastic sheet fine washing system, at least one hot washing cylinder air vent communicating with the inner cavity of the hot washing cylinder is arranged at the top of the hot washing cylinder; A Ph detection sensor for detecting the detergent content in the cleaning liquid in the hot washing cylinder is arranged on the hot washing cylinder; A thermocouple for detecting the temperature of the cleaning liquid in the hot washing cylinder is arranged on the hot washing cylinder; The structure of the detergent adding system is as follows: a liquid detergent adding port communicating with the inner cavity of the hot washing cylinder is arranged on the hot washing cylinder; each hot washing pot is matched with a medicine adding tank, and the liquid detergent adding ports of each hot washing pot are connected with the outlets of the corresponding medicine adding tanks through the corresponding medicine adding pipelines. A first valve with a first flowmeter and a first water pump are arranged on each medicine adding pipeline; a powder detergent adding port communicating with the inner cavity of the hot washing cylinder is arranged on the hot washing cylinder, and a screw conveyor is arranged at the powder detergent adding port. A hot water supply tank is also provided. The hot water inlets of each hot washing pot are connected with the hot water outlet of the hot water supply tank through the corresponding hot water pipelines. A second valve with a second flowmeter and a second water pump are arranged on each hot water pipeline.

[0019] Further, for the above-mentioned food-grade plastic sheet fine washing system, the structure of the separation and filtration bin includes: a bin body; the bin body has a separation cavity and a filtration cavity. The filtration cavity is located below the separation cavity, and the separation cavity is communicated with the filtration cavity through a plurality of filtration holes. A feed inlet communicating with the separation cavity is arranged at the top of the bin body, and the feed inlet is the material feed inlet of the separation and filtration bin; a discharge outlet communicating with the separation cavity is arranged at the bottom of the bin body, and a discharge valve is installed at the discharge outlet; a feeding device for sending the material entering from the feed inlet to the discharge outlet is arranged in the separation cavity. A bottom slag cleaning port communicating with the filtration cavity is arranged at the bottom of the bin body, and a bottom slag cleaning valve is installed at the bottom slag cleaning port; a slag cleaning device for cleaning the filtration cavity is arranged in the filtration cavity.

[0020] Further, for the above-mentioned food-grade plastic sheet fine washing system, the structure of the feeding device includes: a rotating shaft, the rotating shaft is horizontally supported in the separation cavity through a third bearing group, and the rotating shaft is driven to rotate by a third driving device; a conveying spiral belt is arranged on the rotating shaft through a plurality of support rods, and the rotation direction of the conveying spiral belt is such that the material entering from the feed inlet can be conveyed towards the discharge outlet during the rotation of the rotating shaft. The feed inlet is located at the central position of the top of the separation cavity, and the discharge outlet is located at the left end or the right end of the bottom of the separation cavity. A spiral conveyor for blanking is arranged on the total machine frame, and the inlet of the spiral conveyor for blanking is connected with the outlet of the discharge valve.

[0021] Furthermore, for the aforementioned food-grade plastic sheet fine washing system, the structure of the slag cleaning device includes: a slag cleaning screw, which is horizontally supported in the filtering cavity through a fourth bearing group, and the slag cleaning screw is driven to rotate by a fourth driving device; The spiral blades from the left end to the center of the slag cleaning screw are the third continuous spiral blades, and the spiral blades from the right end to the center of the slag cleaning screw are the fourth continuous spiral blades. The bottom slag cleaning port is located below the section between the third continuous spiral blades and the fourth continuous spiral blades; The rotation direction of the third continuous spiral blades is opposite to that of the fourth continuous spiral blades. When the slag cleaning screw is driven to rotate by the fourth driving device, the impurities accumulated in the filtering cavity can be gathered and discharged towards the bottom slag cleaning port in the center from both left and right sides.

[0022] The beneficial effects of the present invention are as follows: ① Two hot washing pots are adopted to improve the hot washing efficiency, and the spatial layout of the two hot washing pots, the separation and filtration bin, and the horizontal material distribution and conveying equipment can not only improve the utilization rate of the longitudinal space, but also reduce the occupation rate of the horizontal space, improve the overall space utilization rate, and make the overall structure more compact and more convenient for integrated management; ② The stirring in the hot washing pot adopts plow blades. The plow blades have the advantages of small resistance, large blade area, and can smoothly shovel up the materials, which can not only reduce energy consumption, but also improve the material turning ability. Cooperating with the horizontally placed hot washing pot, through the cooperation mode of the two-stage intermittent spiral blades + plow blades, the materials are turned and move from the center to both left and right sides at the same time, ensuring that the materials are fully contacted with the cleaning liquid and fully turned, thereby improving the cleaning effect, and there is no need to extend the cleaning time, with high cleaning efficiency and further energy consumption reduction; ③ The slag in the hot washing cylinder is cleaned through the cooperation mode of the two-stage intermittent spiral blades + plow blades + compressed air blowing. There are basically no residues attached in the hot washing cylinder, and the slag cleaning is convenient and thorough; ④ The separation and filtration bin can not only play a role in material buffer and transition, but also play a role in coarse filtration, filtering out most of the cleaning liquid and powder in the materials, laying a foundation for the subsequent dehydration efficiency. Description of the Drawings

[0023] Figure 1 It is a three-dimensional structural schematic diagram of a food-grade plastic sheet fine washing system described in the present invention.

[0024] Figure 2 is Figure 1 the structural schematic diagram of the horizontal material distribution and conveying equipment in

[0025] Figure 3 is Figure 2 the internal structural schematic diagram of the horizontal material distribution and conveying equipment in

[0026] Figure 4It is another structural schematic diagram of the horizontal material dividing and conveying equipment.

[0027] Figure 5 It is a structural schematic diagram of the hot washing pot.

[0028] Figure 6 It is Figure 5 The internal structural schematic diagram of the middle hot washing pot.

[0029] Figure 7 It is Figure 5 The partial structural schematic diagram in the right view direction.

[0030] Figure 8 It is a structural schematic diagram of the stirring shaft.

[0031] Figure 9 It is a structural schematic diagram of the separation and filtration bin.

[0032] Figure 10 It is Figure 9 The partial enlarged structural schematic diagram of part A in it.

[0033] Figure 11 It is Figure 9 The partial enlarged structural schematic diagram of part B in it.

[0034] Figure 12 It is a structural schematic diagram of the rotating shaft and the conveying spiral belt on it.

[0035] Among them: 1. Total machine frame; 11. Partition layer; 12. Screw conveyor for feeding; 13. Front feeding hopper; 14. Ladder; 15. Fence; 2. Hot washing cylinder; 201. Left hot washing pot; 202. Right hot washing pot; 203. First machine frame; 21. Vent hole of hot washing cylinder; 22. Liquid detergent adding port; 221. First pipeline; 222. First flowmeter; 223. First valve; 23. Chemical dosing tank; 24. Screw conveyor; 25. Hot water supply tank; 251. Hot water pipeline; 26. Feeding port; 27. Discharging port; 271. Discharge valve; 28. Left slag cleaning port; 281. Left slag cleaning valve; 29. Right slag cleaning port; 291. Right slag cleaning valve; 3. Separation and filtration bin; 31. Bin body; 32. Separation cavity; 33. Filtration cavity; 34. Filtration holes; 35. Feed inlet; 36. Discharge outlet; 361. Discharge valve; 37. Installation base; 38. Third driving motor; 381. Coupling; 39. Bottom slag cleaning port; 391. Bottom slag cleaning valve; 3100. Upper vent hole; 4. Horizontal material distribution and conveying equipment; 41. Material distribution cylinder; 411. Feeding port; 412. Left discharging port; 413. Right discharging port; 42. Material distribution screw; 421. First continuous spiral blade; 422. Second continuous spiral blade; 43. First driving motor; 44. First chain drive; 45. Feeding hopper; 46. Left part material distribution screw; 461. Left continuous spiral blade; 462. Left driving motor; 463. Left chain drive; 47. Right part material distribution screw; 471. Right continuous spiral blade; 472. Right driving motor; 473. Right chain drive; 48. Second machine frame; 5. Stirring shaft; 501. Left bearing support seat; 502. Right bearing support seat; 51. Second driving motor; 52. First intermittent spiral blade; 53. First pear-shaped knife; 54. Second intermittent spiral blade; 55. Second pear-shaped knife; 56. Air blowing hole; 57. Rotary valve; 6. Rotating shaft; 61. Conveying spiral ribbon; 62. Support rod; 7. Slag cleaning screw; 71. Third continuous spiral blade; 72. Fourth continuous spiral blade; 73. Smooth rod section without spiral blade in the middle; 74. Fourth driving motor; 75. Side chain drive. Detailed implementation manners

[0036] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments. However, the example embodiments can be embodied in different forms and should not be construed as limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete, and to enable those skilled in the art to fully understand the scope of the present disclosure.

[0037] Without conflict, the various embodiments of the present disclosure and the features in the embodiments can be combined with each other. Embodiment 1

[0038] A food-grade plastic sheet fine washing system described in this embodiment, as Figure 1 shown, includes: a general machine frame 1, the general machine frame 1 has a partition layer 11, and the partition layer 11 divides the general machine frame 1 into upper and lower two-layer areas: an upper area and a lower area; A ladder 14 for workers to reach the required working area is further provided on the general machine frame 1. Multiple ladders 14 can be provided and designed according to actual needs. A fence 15 is also provided on the general machine frame 1, and the fence 15 is also designed according to actual requirements.

[0039] In the upper layer area, there are two hot washing pots for hot washing materials: the left hot washing pot 201 and the right hot washing pot 202. Both hot washing pots are arranged on the separation layer 11 through their respective corresponding first racks 203. Among them, the optimal arrangement position of the two hot washing pots is in the order from left to right; In the lower layer area, there is a separation and filtration bin 3 for filtering materials. The material output ports of the two hot washing pots are both communicated with the material inlet of the separation and filtration bin 3; Such as Figure 1 、 Figure 2 、 Figure 3 and Figure 4 shown, a food-grade plastic sheet fine washing system described in this embodiment further includes: a horizontal material distribution and conveying device 4; The structure of the horizontal material distribution and conveying device 4 includes: a material distribution cylinder 41. The material distribution cylinder 41 is arranged above the two hot washing pots through a second rack 48; at the center of the top of the material distribution cylinder 41, there is a feeding port 411 communicated with the inner cavity of the material distribution cylinder 41; at the left end of the bottom of the material distribution cylinder 41, there is a left discharging port 412 communicated with the inner cavity of the material distribution cylinder 41. At the left discharging port 412, there is a left discharging valve, and the outlet of the left discharging valve is communicated with the feeding port of the left hot washing pot 201; at the right end of the bottom of the material distribution cylinder 41, there is a right discharging port 413 communicated with the inner cavity of the material distribution cylinder 41. At the right discharging port 413, there is a right discharging valve, and the outlet of the right discharging valve is communicated with the feeding port of the right hot washing pot 202; In the inner cavity of the material distribution cylinder 41, there is a material distribution and conveying device for sending the materials entering from the feeding port 411 to the left discharging port 412 and the right discharging port 413 respectively.

[0040] Such as Figure 4 shown, the structure of the material distribution and conveying device described in this embodiment includes: a material distribution screw 42. The material distribution screw 42 is supported and arranged in the inner cavity of the material distribution cylinder 41 through a first bearing group. The material distribution screw 42 is driven to rotate by a first driving device. The first driving device adopts a first driving motor 43. The output shaft of the first driving motor 43 is connected with the input shaft of a first chain drive 44, and the output shaft of the first chain drive 44 is connected with one end of the material distribution screw 42.

[0041] A first continuous spiral blade 421 is provided from the left end of the material distributing screw 42 to the section where the center of the material distributing screw 42 is located, and a second continuous spiral blade 422 is provided from the right end of the material distributing screw 42 to the section where the center of the material distributing screw 42 is located; in addition to the continuous spiral blades, discontinuous spiral blades can also be used on the material distributing screw 42. Specifically: a number of first discontinuous spiral blades are evenly spaced along the left spiral line trajectory from the left end of the material distributing screw 42 to the section where the center of the material distributing screw 42 is located, and a number of second discontinuous spiral blades are evenly spaced along the right spiral line trajectory from the right end of the material distributing screw 42 to the section where the center of the material distributing screw 42 is located. Which type of spiral blade is specifically used is selected according to actual needs.

[0042] When continuous spiral blades are used, as Figure 4 shown, the spiral direction of the first continuous spiral blade 421 is opposite to that of the second continuous spiral blade 422, and the driving direction of the first driving device is such that when the material distributing screw 42 is driven to rotate by the first driving device, the material in the inner cavity of the material distributing cylinder 42 can be conveyed and discharged from the center to the left and right sides, namely the left discharge port 412 and the right discharge port 413.

[0043] When discontinuous spiral blades are used, the spiral direction of the left spiral line trajectory is opposite to that of the right spiral line trajectory, so that when the material distributing screw 42 is driven to rotate by the first driving device, the material in the inner cavity of the material distributing cylinder 42 can be conveyed and discharged from the center to the left and right sides, namely the left discharge port 412 and the right discharge port 413.

[0044] In addition to the above structure, the following structure can also be adopted for the material distributing and conveying device. The structure of the material distributing and conveying device includes: a left material distributing screw 46 and a right material distributing screw 47; The left material distributing screw 46 is supported by a left bearing group and arranged in the left part of the inner cavity of the material distributing cylinder 41, and the left material distributing screw 46 is driven to rotate by a left driving device; wherein, the left driving device adopts a left driving motor 462, the output shaft of the left driving motor 462 is connected to the input shaft of the left chain drive 463, and the output shaft of the left chain drive 463 is connected to the left end of the left material distributing screw 46.

[0045] The right material distributing screw 47 is supported by a right bearing group and arranged in the right part of the inner cavity of the material distributing cylinder 41, and the right material distributing screw 47 is driven to rotate by a right driving device; wherein, the right driving device adopts a right driving motor 472, the output shaft of the right driving motor 472 is connected to the input shaft of the right chain drive 473, and the output shaft of the right chain drive 473 is connected to the left end of the right material distributing screw 47.

[0046] A left continuous spiral blade 461 is provided on the left material dividing screw 46, and a right continuous spiral blade 471 is provided on the right material dividing screw 47; alternatively, a number of left discontinuous spiral blades are evenly spaced along the left spiral line trajectory on the left material dividing screw 46, and a number of right discontinuous spiral blades are evenly spaced along the right spiral line trajectory on the right material dividing screw 47; which specific spiral blade to use is selected according to actual needs. When the left driving device drives the left material dividing screw 46 to rotate and the right driving device drives the right material dividing screw 47 to rotate, the material fed into the inner cavity of the material dividing cylinder 41 from the feeding port 411 is driven by the left material dividing screw 46 and the right material dividing screw 47 to be divided into two streams to the left and right, and then is conveyed out in the directions of the left discharging port 412 and the right discharging port 413.

[0047] To facilitate feeding into the feeding port 411 of the material dividing cylinder 41, in this embodiment, a conical feeding hopper 45 with a large upper opening and a small lower opening is further provided at the feeding port of the material dividing cylinder 41. A screw conveyor 12 for feeding is provided on the total machine frame 1, and the outlet of the screw conveyor 12 for feeding is connected to the inlet of the feeding hopper 45. In addition, a front feeding hopper 13 can also be provided at the inlet of the screw conveyor 12 for feeding to dock with the output port of the previous process.

[0048] The food-grade plastic sheet fine washing system described in this embodiment uses two hot washing pots to improve the hot washing efficiency, and arranges the two hot washing pots, the separation and filtration bin 3, and the horizontal material dividing and conveying equipment in space, which can not only improve the utilization rate of the longitudinal space, but also reduce the occupation rate of the horizontal space, improve the overall space utilization rate, and make the overall structure more compact and more convenient for integrated management; in addition, a separation and filtration bin is added to the fine washing system to perform rough filtration on the material after hot washing, which can improve the dehydration efficiency and dehydration effect of the subsequent process. Embodiment Two

[0049] This embodiment designs the structure of the hot washing pot on the basis of Embodiment One to improve the hot washing efficiency and hot washing effect of the hot washing pot.

[0050] The hot washing pot described in this embodiment, as Figure 5 shown, includes: a hot washing cylinder 2 provided on the first machine frame 203, the hot washing cylinder is placed horizontally, and a detergent adding system for adding detergent into the inner cavity of the hot washing cylinder 2 is provided on the hot washing cylinder 2. The detergent adding system described in this embodiment includes a liquid detergent adding system and a powder detergent adding system.

[0051] Among them, the liquid detergent adding system is: as Figure 5 and Figure 7As shown in the figure, a liquid detergent addition port 22 communicating with the inner cavity of the hot wash cylinder 2 is provided on the hot wash cylinder 2. A first pipeline 221 is provided at the liquid detergent addition port 22, and a first valve 223 with a first flowmeter 222 is installed on the first pipeline 221. The liquid detergent is added into the inner cavity of the hot wash cylinder 2 through the first pipeline 221. The liquid detergent is usually stored in the chemical dosing tank 23. Two chemical dosing tanks 23 are installed on the main frame 1, and each hot wash pot corresponds to one chemical dosing tank 23. A first water pump can be correspondingly provided for each first pipeline 221 of each hot wash pot. The liquid detergent in the corresponding chemical dosing tank 23 is pumped out and sent into the hot wash pot through the first water pump.

[0052] Among them, the powder detergent addition system is as follows: As Figure 5 shown in the figure, a powder detergent addition port communicating with the inner cavity of the hot wash cylinder 2 is provided on the hot wash cylinder 2. A screw conveyor 24 is provided at the powder detergent addition port. The screw conveyor 24 belongs to a common conveying device. In this solution, the screw conveyor 24 is used for adding powder detergent, rather than innovating the structure of the screw conveyor 24. Therefore, the structure of the screw conveyor 24 will not be elaborated here.

[0053] In this embodiment, as Figure 1 shown in the figure, a hot water inlet communicating with the inner cavity of the hot wash cylinder 2 is provided on the hot wash cylinder 2. A hot water pipeline 251 is provided at the hot water inlet, and a second valve with a second flowmeter is installed on the hot water pipeline 251. The hot water is added into the inner cavity of the hot wash cylinder 2 through the hot water pipeline 251. The hot water can be directly introduced into the hot water pipeline 251 from the equipment providing hot water, or a hot water supply tank 25 can be set. Taking the setting of the hot water supply tank 25 as an example in this embodiment, a hot water supply tank 25 is installed on the main frame 1, and the hot water is stored in the hot water supply tank 25. Two hot water outlets are provided on the hot water supply tank 25. The hot water inlets of the two hot wash pots are respectively communicated with the corresponding hot water outlets on the hot water supply tank 25 through their respective corresponding hot water pipelines 251. When hot water is needed, the hot water in the hot water supply tank 25 is pumped out through their respective corresponding second water pumps and sent into the corresponding hot water pipelines 251, and enters the corresponding hot wash pots through the corresponding hot water pipelines 251.

[0054] In this embodiment, as Figure 5 and Figure 6 shown in the figure, a feeding port 26 communicating with the inner cavity of the hot wash cylinder 2 is provided at the center of the top of the hot wash cylinder 2.

[0055] At the center of the bottom of the hot washing cylinder body 2, there is a discharge port 27 communicating with the inner cavity of the hot washing cylinder body 2. A discharge valve 271 is installed at the discharge port 27. The discharge valve 271 is in a closed state during the hot washing process and the slag cleaning process, and is only in an open state during the discharging process. Among them, the outlet of the discharge valve 271 described in this embodiment is the material output port of the hot washing pot described in the first embodiment.

[0056] On the left and right ends of the bottom of the hot washing cylinder body 2, there is respectively provided a side slag cleaning port communicating with the inner cavity of the hot washing cylinder body 2. A side slag cleaning valve is installed at each side slag cleaning port; for the convenience of description, the side slag cleaning port and the side slag cleaning valve on the left side are called the left slag cleaning port 28 and the left slag cleaning valve 281, and the side slag cleaning port and the side slag cleaning valve on the right side are called the right slag cleaning port 29 and the right slag cleaning valve 291. The left slag cleaning port 28 and the right slag cleaning port 29 are in a closed state during the hot washing process and the discharging process, and are only in an open state during the slag cleaning process.

[0057] The stirring shaft 5 is supported in the inner cavity of the hot washing cylinder body 2 through the second bearing seat group. In this embodiment, a left bearing support seat 501 is fixedly provided at the left end of the hot washing cylinder body 2, and a right bearing support seat 502 is fixedly provided at the right end of the hot washing cylinder body 2. The left end of the stirring shaft 5 is hermetically passed through the left through hole of the hot washing cylinder body 2 and is supported in the bearing in the left bearing support seat 501, and the right end of the stirring shaft 5 is hermetically passed through the right through hole of the hot washing cylinder body 2 and is supported in the bearing in the right bearing support seat 502. The stirring shaft 5 is driven to rotate forward or backward by the second driving device. The second driving device adopts a second driving motor 51, and the motor shaft of the second driving motor 51 is fixedly connected to one end of the stirring shaft 5.

[0058] A first feeding and stirring structure with stirring and feeding functions is provided on the left part of the stirring shaft 5, and a second feeding and stirring structure with stirring and feeding functions is provided on the right part of the stirring shaft 5. When the stirring shaft 5 rotates, the feeding directions of the first feeding and stirring structure and the second feeding and stirring structure are opposite; thus, when the stirring shaft 5 is driven to rotate forward or backward by the driving device, the materials in the inner cavity of the hot washing cylinder body 2 can move from both the left and right sides to the center or from the center to both the left and right sides simultaneously through the first feeding and stirring structure and the second feeding and stirring structure.

[0059] Among them, the first feeding and stirring structure is: as Figure 6 and Figure 8 shown, on the stirring shaft 5, a number of first discontinuous spiral blades 52 are arranged at intervals along the first spiral line trajectory from the central position of the stirring shaft 5 to the left side direction, and a number of first pear-shaped knives 53 are arranged at intervals along the first spiral line trajectory from the central position of the stirring shaft 5 to the left side direction.

[0060] Among them, the second feeding and stirring structure is as follows: on the stirring shaft 5, a number of second intermittent spiral blades 54 are arranged at intervals along a second spiral line trajectory from the central position of the stirring shaft 5 towards the right side direction, and a number of second plow blades 55 are arranged at intervals along a second spiral line trajectory from the central position of the stirring shaft 5 towards the right side direction on the stirring shaft 5.

[0061] Among them, the first intermittent spiral blade 52 and the second intermittent spiral blade 54 are strip-shaped structures.

[0062] The first spiral line trajectory and the second spiral line trajectory have opposite helix directions. Therefore, when the stirring shaft 5 rotates, the conveying directions of the first feeding and stirring structure and the second feeding and stirring structure are opposite. Assuming that when the stirring shaft 5 rotates forward, the conveying direction of the first feeding and stirring structure is from the center of the inner cavity of the hot washing cylinder 2 towards the left side, then the conveying direction of the second feeding and stirring structure is opposite, from the center of the inner cavity of the hot washing cylinder 2 towards the right side. At this time, the materials in the inner cavity of the hot washing cylinder 2 can be conveyed to the left and right sides respectively. On the contrary, when the stirring shaft 5 rotates reversely, the conveying direction of the first feeding and stirring structure is from the left side of the inner cavity of the hot washing cylinder 2 towards the center, and the conveying direction of the second feeding and stirring structure is from the right side of the inner cavity of the hot washing cylinder 2 towards the center. At this time, the materials in the inner cavity of the hot washing cylinder 2 can be gathered towards the center.

[0063] During feeding, the stirring shaft 5 rotates to make the conveying direction of the first feeding and stirring structure from the center of the inner cavity of the hot washing cylinder 2 towards the left side, and the conveying direction of the second feeding and stirring structure from the center of the inner cavity of the hot washing cylinder 2 towards the right side. The materials enter the middle of the inner cavity of the hot washing cylinder 2 through the feeding port 26, and then are dispersed, turned and conveyed to the left and right sides through the first feeding and stirring structure and the second feeding and stirring structure.

[0064] During discharging, the rotation direction of the stirring shaft 5 is opposite to that during feeding, making the conveying direction of the first feeding and stirring structure from the left side of the inner cavity of the hot washing cylinder 2 towards the center, and the conveying direction of the second feeding and stirring structure from the right side of the inner cavity of the hot washing cylinder 2 towards the center, turning and gathering the materials towards the center. Open the discharge valve 271, and the materials mixed with the cleaning liquid will be discharged from the discharge valve 271.

[0065] The stirring uses plow blades. The plow blades have the advantages of small resistance, large blade area, and being able to smoothly shovel up the materials, etc. It can not only reduce energy consumption, but also improve the material turning ability. Cooperating with the horizontal hot washing pot, through the cooperation mode of the two-stage intermittent spiral blade + plow blade, the materials are turned and at the same time move from the center to the left and right sides and turn and at the same time move from the left and right sides to the center, ensuring that the materials are fully contacted with the cleaning liquid and fully turned, thereby improving the cleaning effect, and there is no need to extend the cleaning time, with high cleaning efficiency and further reducing energy consumption.

[0066] After the cleaning liquid and materials in the hot washing cylinder 2 are discharged through the discharge valve 271, there will be a small amount of residue in the hot washing cylinder 2 at this time. To avoid the adhesion and accumulation of the residue, it is necessary to remove the residue from the hot washing cylinder 2. When removing the residue, the rotation direction of the stirring shaft 5 is the same as that during feeding, so that the conveying direction of the first feeding and stirring structure is from the center of the inner cavity of the hot washing cylinder 2 to the left, and the conveying direction of the second feeding and stirring structure is from the center of the inner cavity of the hot washing cylinder 2 to the right. The residue is shoveled out by the first plow blade 53 and the second plow blade 55 and pushed towards the left residue removal valve 281 and the right residue removal valve 291 respectively. The residue is removed from the hot washing cylinder 2 through the left residue removal valve 281 and the right residue removal valve 291, and the residue removal is very convenient.

[0067] To improve the residue removal effect, a more optimal solution in this embodiment is to set a purging structure on the basis of the above structure. Specifically: as Figure 8 shown, the stirring shaft 5 is a hollow shaft structure with a central channel. A plurality of air blowing holes 56 communicating with the central channel are arranged at intervals on the circumferential side wall of the stirring shaft 5, and the layout of the air blowing holes 56 is preferably evenly distributed. One end of the stirring shaft 5 is connected to the second driving motor 51, and a rotary valve 57 is arranged at the other end of the stirring shaft 5. The rotary valve 57 can be connected to a compressed air pipeline. During the process of removing the residue from the inner cavity of the hot washing cylinder 2, compressed air is introduced into the compressed air pipeline. The compressed air enters the central channel through the compressed air pipeline and the rotary valve 57, and then is sprayed into the inner cavity of the hot washing cylinder 2 through each air blowing hole 56 to purge the inner cavity of the hot washing cylinder 2. By means of the cooperation of the two-stage intermittent spiral blade + plow blade + compressed air purging, there is basically no residue adhesion in the hot washing cylinder 2, and the residue removal is convenient and the residue removal effect is very good.

[0068] In this embodiment, as Figure 5 shown, at least one hot washing cylinder air vent 21 communicating with the inner cavity of the hot washing cylinder is arranged at the top of the hot washing cylinder 2, and a sealing plate can be arranged on the air vent 21, and the sealing plate can be removed when ventilation is required.

[0069] In this embodiment, a Ph detection sensor for detecting the detergent content in the cleaning liquid in the hot washing cylinder 2 is arranged on the hot washing cylinder 2. The detergent content in the cleaning liquid in the hot washing cylinder 2 can be monitored in real time through the Ph detection sensor to ensure that the detergent addition amount meets the specified requirements.

[0070] In this embodiment, a thermocouple for detecting the temperature of the cleaning liquid in the hot washing cylinder 2 is arranged on the hot washing cylinder 2. The temperature of the cleaning liquid in the hot washing cylinder 2 is monitored in real time through the thermocouple to ensure that the cleaning liquid temperature meets the hot washing specified requirements.

[0071] In this embodiment, a more optimal solution is that the hot wash cylinder 2 can also be designed to have a hollow sandwich structure on the above-mentioned structure. A steam inlet and a steam outlet communicating with the hollow sandwich are provided on the hot wash cylinder 2. During the hot wash process, steam can also be introduced into the hollow sandwich for auxiliary heating to ensure the hot wash temperature. Embodiment III

[0072] This embodiment designs the structure of the separation and filtration chamber 3 on the basis of Embodiment I to improve the coarse filtration efficiency and the coarse filtration effect.

[0073] The separation and filtration chamber 3 in this embodiment is as Figure 9 and Figure 10 shown, and includes: a chamber body 31; the chamber body 31 has a separation cavity 32 and a filtration cavity 33. The filtration cavity 33 is located below the separation cavity 32, and the separation cavity 32 communicates with the filtration cavity 33 through a plurality of filtration holes 34.

[0074] A feed port 35 communicating with the separation cavity 32 is provided at the top of the chamber body 31, a discharge port 36 communicating with the separation cavity 32 is provided at the bottom of the chamber body 1, and a discharge valve 361 is installed at the discharge port 36; a feeding device for sending the material entering from the feed port 35 to the discharge port 36 is provided in the separation cavity 32.

[0075] The material with impurities such as powder and cleaning liquid output after hot washing in the hot wash pot enters the separation cavity 32 of the chamber body 31 through the feed port 35. Among them, the cleaning liquid and impurities such as powder in the material enter the filtration cavity 33 through the respective filtration holes 34, while the material is left in the separation cavity 32 and is output outside the chamber body 1 by the feeding device, thereby achieving the purpose of coarse filtration.

[0076] Among them, the respective filtration holes 34 preferably select round holes; a more optimal solution is that the sizes of the respective filtration holes 34 are the same, and the respective filtration holes 34 are evenly spaced in the region from the left end to the right end of the filtration cavity 33. The optimal size of the filtration holes 34 selects the following parameters: the aperture of the filtration holes 34 is φ1.5 to φ3 mm.

[0077] There are various structural forms of the feeding device. Considering the self-characteristics of the broken waste plastics, that is, plastic sheets, this solution selects a conveying spiral belt with less damage to the plastic sheets and less resistance. The specific structure is: as Figure 9 and Figure 12As shown, the structure of the feeding device includes: a rotating shaft 6, which is horizontally supported by a first bearing set in the separation cavity 32 through the rotating shaft 6. The separation cavity 32 is also a horizontally arranged closed long channel structure. The rotating shaft 6 is driven to rotate by a third driving device; a conveying spiral belt 61 is arranged on the rotating shaft 6 through a number of support rods 62, and the rotation direction of the conveying spiral belt 61 enables the material entering from the feeding port 35 to be conveyed towards the discharging port 36 during the rotation of the rotating shaft 6.

[0078] The distribution positions of the support rods 62 are evenly spaced along the spiral direction of the conveying spiral belt 61.

[0079] The rotating shaft 6 can adopt a hollow shaft structure.

[0080] In this embodiment, the layout of the feeding port 35 and the discharging port 36 is preferably as follows: the feeding port 35 is located at the central position at the top of the separation cavity 32, and the discharging port 36 is located at the left end or the right end at the bottom of the separation cavity 32. Figure 9 As shown, the discharging port 36 is located at the right end at the bottom of the separation cavity 32. At this time, the right part of the filtering cavity 33 is slightly shorter than the separation cavity 32 to avoid the discharging valve 361.

[0081] Among them, the third driving device is a third driving motor 38 installed on the installation base 37. The output shaft of the third driving motor 38 is fixedly connected to one end of the rotating shaft 6 extending out of the first bearing set through a coupling 381.

[0082] As Figure 9 and Figure 10 shown, in this embodiment, a bottom slag cleaning port 39 communicating with the filtering cavity 33 is provided at the bottom of the bin body 31, and a bottom slag cleaning valve 391 is installed at the bottom slag cleaning port 39; a slag cleaning device for cleaning the filtering cavity 33 is provided in the filtering cavity 33, and through the slag cleaning device, powders and other impurities entering the filtering cavity 33 through the filtering holes 34 can be cleared out of the filtering cavity 33.

[0083] There are various structural forms of the slag cleaning device. Considering comprehensive factors such as slag cleaning efficiency, effect, and energy consumption, a screw structure is selected in this scheme. As Figure 9 and Figure 10 shown, the specific structure is: the structure of the slag cleaning device includes: a slag cleaning screw 7, which is horizontally supported by a fourth bearing set in the filtering cavity 33. The filtering cavity 33 is also a horizontally arranged closed long channel structure. The slag cleaning screw 7 is driven to rotate by a fourth driving device.

[0084] The spiral blades on the slag cleaning screw 7 are divided into two continuous spiral blades. One is the spiral blade from the left end of the slag cleaning screw 7 to the center of the slag cleaning screw 7, which is the continuous third continuous spiral blade 71; the other is the spiral blade from the right end of the slag cleaning screw 7 to the center of the slag cleaning screw 7, which is the continuous fourth continuous spiral blade 72. The bottom slag cleaning port 39 is located below the section between the third continuous spiral blade 71 and the fourth continuous spiral blade 72, that is, below the smooth rod section 73 without spiral blades in the middle.

[0085] The rotation direction of the third continuous spiral blade 71 is opposite to that of the fourth continuous spiral blade 72, and when the slag cleaning screw 7 is driven to rotate by the fourth driving device, the impurities accumulated in the filtering cavity 33 can be gathered and discharged towards the slag cleaning port 39 in the center from both left and right sides.

[0086] Among them, as Figure 11 shown, the fourth driving device is the fourth driving motor installed on the installation base 37. The output shaft of the fourth driving motor 74 is fixedly connected to the input shaft of the side chain drive 75, and the output shaft of the side chain drive 75 is fixedly connected to one end of the slag cleaning screw 7.

[0087] Among them, the fourth driving motor 74 in the fourth driving device and the third driving motor 38 in the third driving device usually adopt reduction motors.

[0088] In this embodiment, an upper air vent 3100 communicating with the separation cavity 32 is provided at the top of the bin body 31, and the number of the upper air vents 3100 is at least one.

[0089] The above-mentioned separation and filtration bin has the advantages of compact structure, convenient operation, low energy consumption, etc. It can not only play a role in material buffer and transition, but also filter out about 80% of impurities such as powder and about 85% of cleaning liquid in the material, laying a foundation for the subsequent dehydration efficiency and dehydration effect.

[0090] The above is only a preferred embodiment of the present invention, and it is not limited to the present invention in any other form. Any modification or equivalent change made according to the technical essence of the present invention still belongs to the scope of protection required by the present invention.

Claims

1. A fine washing system for food-grade plastic sheets, comprising: General frame, characterized in that: the general frame has a partition layer, and the partition layer divides the general frame into upper and lower two-layer areas: an upper area and a lower area; In the upper area, there are two hot washing pots for hot washing materials: a left hot washing pot and a right hot washing pot. Both hot washing pots are arranged on the partition layer through their respective corresponding first frames; In the lower area, there is a separation and filtration bin for filtering materials, and the material output ports of the two hot washing pots are both communicated with the material feeding port of the separation and filtration bin; A horizontal material distribution and conveying device is also provided; The structure of the horizontal material distribution and conveying device includes: a horizontally arranged material distribution cylinder body, and the material distribution cylinder body is arranged above the two hot washing pots through a second frame; at the center of the top of the material distribution cylinder body, there is a feeding port communicated with the inner cavity of the material distribution cylinder body; at the left end of the bottom of the material distribution cylinder body, there is a left discharging port communicated with the inner cavity of the material distribution cylinder body, and at the left discharging port, there is a left discharging valve, and the outlet of the left discharging valve is communicated with the feeding port of the left hot washing pot; at the right end of the bottom of the material distribution cylinder body, there is a right discharging port communicated with the inner cavity of the material distribution cylinder body, and at the right discharging port, there is a right discharging valve, and the outlet of the right discharging valve is communicated with the feeding port of the right hot washing pot; In the inner cavity of the material distribution cylinder body, there is a material distribution and conveying device for sending the materials entering from the feeding port to the left discharging port and the right discharging port respectively.

2. The fine washing system for food-grade plastic sheets according to claim 1, wherein: The structure of the material distribution and conveying device includes: a material distribution screw, and the material distribution screw is supported and arranged in the inner cavity of the material distribution cylinder body through a first bearing group, and the material distribution screw is driven to rotate by a first driving device; In the section from the left end of the material distribution screw to the central part of the material distribution screw, there is a first continuous spiral blade, and in the section from the right end of the material distribution screw to the central part of the material distribution screw, there is a second continuous spiral blade; or in the section from the left end of the material distribution screw to the central part of the material distribution screw, there are a number of first discontinuous spiral blades evenly spaced along the left spiral line track, and in the section from the right end of the material distribution screw to the central part of the material distribution screw, there are a number of second discontinuous spiral blades evenly spaced along the right spiral line track; The rotation direction of the first continuous spiral blade is opposite to that of the second continuous spiral blade, or the rotation direction of the left spiral line track is opposite to that of the right spiral line track, so that when the material distribution screw is driven to rotate by the first driving device, the materials in the inner cavity of the material distribution cylinder body can be conveyed and discharged from the central part to the left discharging port and the right discharging port on the left and right sides.

3. A fine washing system for food-grade plastic sheets according to claim 1, characterized in that: The structure of the material distribution and conveying device includes: a left material distribution screw and a right material distribution screw; The left material distribution screw is supported and arranged in the left part of the inner cavity of the material distribution cylinder body through a left bearing group, and the left material distribution screw is driven to rotate by a left driving device; The right material distribution screw is supported and arranged in the right part of the inner cavity of the material distribution cylinder body through a right bearing group, and the right material distribution screw is driven to rotate by a right driving device; A left continuous spiral blade is provided on the left part feeding screw, and a right continuous spiral blade is provided on the right part feeding screw; or a number of left discontinuous spiral blades are evenly spaced along the left helix direction on the left part feeding screw, and a number of right discontinuous spiral blades are evenly spaced along the right helix direction on the right part feeding screw. When the left part feeding screw rotates driven by the left part driving device, it can convey the material in the inner cavity of the feeding cylinder from the center to the left lower feeding port direction, and when the right part feeding screw rotates driven by the right part driving device, it can convey the material in the inner cavity of the feeding cylinder from the center to the right lower feeding port direction.

4. A fine washing system for food-grade plastic sheets according to claim 1, characterized in that: The structure of the hot wash pot includes: a hot wash cylinder horizontally arranged on the first frame, and a detergent adding system for adding detergent into the inner cavity of the hot wash cylinder is provided on the hot wash cylinder. A hot water inlet communicating with the inner cavity of the hot wash cylinder is provided on the hot wash cylinder. A feeding port communicating with the inner cavity of the hot wash cylinder is provided at the center of the top of the hot wash cylinder. A discharging port communicating with the inner cavity of the hot wash cylinder is provided at the center of the bottom of the hot wash cylinder, and a discharging valve is installed at the discharging port. The outlet of the discharging valve is the material output port of the hot wash pot. A side slag cleaning port communicating with the inner cavity of the hot wash cylinder is respectively provided at the left and right ends of the bottom of the hot wash cylinder, and a side slag cleaning valve is installed at each side slag cleaning port. The stirring shaft is supported in the inner cavity of the hot wash cylinder through a second bearing group, and the stirring shaft is driven by a second driving device to rotate forward or backward. A first feeding and stirring structure with stirring and feeding functions is provided on the left part of the stirring shaft, and a second feeding and stirring structure with stirring and feeding functions is provided on the right part of the stirring shaft; and when the stirring shaft rotates, the feeding directions of the first feeding and stirring structure and the second feeding and stirring structure are opposite.

5. A food-grade plastic sheet fine washing system according to claim 4, characterized in that: The first feeding and stirring structure is: a number of first discontinuous spiral blades are spaced along the first spiral line trajectory from the central position of the stirring shaft to the left side direction on the stirring shaft, and a number of first pear-shaped blades are spaced along the first spiral line trajectory from the central position of the stirring shaft to the left side direction on the stirring shaft. The second feeding and stirring structure is: a number of second discontinuous spiral blades are spaced along the second spiral line trajectory from the central position of the stirring shaft to the right side direction on the stirring shaft, and a number of second pear-shaped blades are spaced along the second spiral line trajectory from the central position of the stirring shaft to the right side direction on the stirring shaft. And the rotation directions of the first spiral line trajectory and the second spiral line trajectory are opposite. The feeding process of the hot wash pot is: when the stirring shaft rotates, the conveying direction of the first feeding and stirring structure is from the center of the inner cavity of the hot wash cylinder to the left side, and the conveying direction of the second feeding and stirring structure is from the center of the inner cavity of the hot wash cylinder to the right side. The material enters the middle of the inner cavity of the hot wash cylinder through the feeding port, and then is dispersed and turned over and conveyed to the left and right sides through the first feeding and stirring structure and the second feeding and stirring structure. The discharging process of the hot wash pan is as follows: the rotation direction of the stirring shaft is opposite to that during feeding, so that the conveying direction of the first feeding and stirring structure is from the left side to the center of the inner cavity of the hot wash cylinder, and the conveying direction of the second feeding and stirring structure is from the right side to the center of the inner cavity of the hot wash cylinder, turning and gathering the materials from the left and right sides towards the center and discharging them from the discharge valve. The slag cleaning process of the hot wash pan is as follows: the rotation direction of the stirring shaft is the same as that during feeding, so that the conveying direction of the first feeding and stirring structure is from the center to the left side of the inner cavity of the hot wash cylinder, and the conveying direction of the second feeding and stirring structure is from the center to the right side of the inner cavity of the hot wash cylinder. The residues are shoveled out by the first plow knife and the second plow knife and pushed towards the side slag cleaning openings on the left and right sides respectively, and the slag is discharged from the side slag cleaning valves on the left and right sides.

6. The food-grade plastic sheet fine washing system according to claim 4 or 5, characterized in that: The stirring shaft is a hollow shaft structure with a central channel, and a number of air blowing holes communicating with the central channel are arranged at intervals on the circumferential side wall of the stirring shaft. One end of the stirring shaft is driven by a second driving device, and a rotary valve for connecting a compressed air pipeline to make the compressed air pipeline communicate with the central channel is arranged at the other end of the stirring shaft. During the process of cleaning the inner cavity of the hot wash cylinder, compressed air is introduced into the compressed air pipeline. The compressed air enters the central channel through the compressed air pipeline and the rotary valve, and then is sprayed into the inner cavity of the hot wash cylinder through each air blowing hole to purge the inner cavity of the hot wash cylinder.

7. A food-grade plastic sheet fine washing system according to claim 4, characterized in that: At least one hot wash cylinder air vent communicating with the inner cavity of the hot wash cylinder is arranged at the top of the hot wash cylinder. A Ph detection sensor for detecting the detergent content in the cleaning liquid in the hot wash cylinder is arranged on the hot wash cylinder. A thermocouple for detecting the temperature of the cleaning liquid in the hot wash cylinder is arranged on the hot wash cylinder. The structure of the detergent adding system is as follows: a liquid detergent adding port communicating with the inner cavity of the hot wash cylinder is arranged on the hot wash cylinder; each hot wash pan is matched with a dosing tank, and the liquid detergent adding ports of each hot wash pan are respectively connected to the outlets of the corresponding dosing tanks through their respective corresponding dosing pipelines. A first valve with a first flow meter and a first water pump are arranged on each dosing pipeline; a powder detergent adding port communicating with the inner cavity of the hot wash cylinder is arranged on the hot wash cylinder, and a screw conveyor is arranged at the powder detergent adding port. A hot water supply tank is also provided. The hot water inlets of each hot wash pan are respectively connected to the hot water outlets of the hot water supply tank through their respective corresponding hot water pipelines. A second valve with a second flow meter and a second water pump are arranged on each hot water pipeline.

8. A food-grade plastic sheet fine washing system according to claim 1 or 4 or 5, characterized in that: The structure of the separation and filtration bin includes: a bin body; the bin body has a separation cavity and a filtration cavity. The filtration cavity is located below the separation cavity, and the separation cavity communicates with the filtration cavity through a number of filtration holes. A feed inlet communicating with the separation cavity is provided at the top of the bin body, and the feed inlet is the material feed inlet of the separation and filtration bin; a discharge outlet communicating with the separation cavity is provided at the bottom of the bin body, and a discharge valve is installed at the discharge outlet; a feeding device for sending the material entering from the feed inlet to the discharge outlet is provided in the separation cavity; A bottom slag cleaning port communicating with the filtration cavity is provided at the bottom of the bin body, and a bottom slag cleaning valve is installed at the bottom slag cleaning port; a slag cleaning device for cleaning the filtration cavity is provided in the filtration cavity.

9. A fine washing system for food-grade plastic sheets according to claim 8, characterized in that: The structure of the feeding device includes: a rotating shaft, the rotating shaft is horizontally supported in the separation cavity through a third bearing group, and the rotating shaft is driven to rotate by a third driving device; a conveying spiral belt is arranged on the rotating shaft through a plurality of support rods, and the rotation direction of the conveying spiral belt enables the material entering from the feed inlet to be conveyed towards the discharge outlet during the rotation of the rotating shaft; The feed inlet is located at the central position at the top of the separation cavity, and the discharge outlet is located at the left end or the right end at the bottom of the separation cavity.

10. A food-grade plastic sheet fine washing system according to claim 8, characterized in that: The structure of the slag cleaning device includes: a slag cleaning screw, the slag cleaning screw is horizontally supported in the filtration cavity through a fourth bearing group, and the slag cleaning screw is driven to rotate by a fourth driving device; The spiral blade from the left end to the center of the slag cleaning screw is a third continuous spiral blade, and the spiral blade from the right end to the center of the slag cleaning screw is a fourth continuous spiral blade, and the bottom slag cleaning port is located below the section between the third continuous spiral blade and the fourth continuous spiral blade; The rotation direction of the third continuous spiral blade is opposite to that of the fourth continuous spiral blade, and when the slag cleaning screw is driven to rotate by the fourth driving device, the impurities accumulated in the filtration cavity can be gathered from the left and right sides towards the bottom slag cleaning port in the center for slag discharge.

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