A food grade plastic sheet fine cleaning system

Abstract

The application discloses a food-grade plastic sheet fine cleaning system, a main frame is divided into an upper area and a lower area by a partition layer; two hot washing pots are arranged in the upper area, a separation and filtration bin is arranged in the lower area, material outlets of the two hot washing pots are communicated with a material inlet of the separation and filtration bin; a horizontal material distribution conveying device is further arranged; the horizontal material distribution conveying device comprises a material distribution cylinder body arranged above the two hot washing pots through a second frame, a material inlet, a left lower outlet provided with a left lower valve and a right lower outlet provided with a right lower valve are arranged on the material distribution cylinder body, an outlet of the left lower valve is communicated with a feeding inlet of a left hot washing pot, and an outlet of the right lower valve is communicated with a feeding inlet of a right hot washing pot; a material distribution conveying device for respectively sending materials entering from the material inlet to the left lower outlet and the right lower outlet is arranged in an inner cavity of the material distribution cylinder body. The system has the advantages of high layout space utilization, convenient integrated management and high hot washing efficiency.

Description

Technical Field

[0001] This invention relates to the field of waste plastic recycling technology, and in particular to a food-grade plastic sheet washing system. Background Technology

[0002] In waste plastic recycling production lines, waste plastics such as bottles and shells undergo multiple processes including sorting, crushing, washing, dehydration, air separation, and bagging. Among these processes, washing is a crucial step, and its effectiveness significantly impacts the quality of the plastics produced.

[0003] The cleaning process is divided into pre-cleaning and hot washing. First, the crushed waste plastic is pre-cleaned to remove impurities such as dust, dirt, and sand from its surface. Then, the waste plastic is hot-washed by adding an appropriate amount of hot water and detergent. For ease of description, the mixture of hot water and detergent is called the cleaning solution. The cleaning solution is heated to a certain temperature and maintained for a period of time while being stirred to further remove stubborn stains and residues from the surface of the waste plastic.

[0004] Hot washing, also known as fine washing, is a crucial process in food-grade plastic sheet fine washing systems. Improving washing efficiency is the most pressing issue and a problem that urgently needs to be solved. Furthermore, the waste plastic output after fine washing contains powder, which affects the dehydration efficiency of the subsequent centrifugal dewatering machine, thus impacting the quality of the final plastic product. Therefore, food-grade plastic sheet fine washing systems need to develop and configure a coarse filtration device that can pre-separate water and powder from the hot-washed waste plastic. Preliminary filtration by this device before sending the plastic to the subsequent dewatering machine can significantly improve dehydration efficiency and effectiveness, thereby enhancing the quality of the final plastic product. Summary of the Invention

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

[0006] For ease of description, this solution refers to all waste plastics requiring fine washing as "materials". Currently, in food-grade plastic sheet fine washing systems, there are common problems such as low cleaning efficiency during hot washing and powder content in the washed material affecting the subsequent dehydration efficiency and effect. To address this issue, the technical solution described in this invention is: a food-grade plastic sheet fine washing system, comprising: a main frame, the main frame having a partition layer that divides the main frame into upper and lower regions: an upper region and a lower region;

[0007] Two hot washing pots for hot washing materials are set in the upper area: a left hot washing pot and a right hot washing pot. Both hot washing pots are set on the partition layer through their respective first frames. The optimal layout of the two hot washing pots is that they are arranged from left to right.

[0008] A separation filter chamber for filtering materials is provided in the lower area, and the material output ports of the two hot washing pots are connected to the material inlet of the separation filter chamber.

[0009] The food-grade plastic sheet washing system is also equipped with a horizontal material conveying device;

[0010] The structure of the horizontal material distribution and conveying equipment includes: a horizontally arranged material distribution cylinder, which is mounted above two hot washing pots via a second frame; a feeding port communicating with the inner cavity of the material distribution cylinder is provided at the center of the top of the material distribution cylinder; a left feeding port communicating with the inner cavity of the material distribution cylinder is provided at the bottom left end of the material distribution cylinder, and a left feeding valve is provided at the left feeding port, the outlet of which is connected to the feeding port of the left hot washing pot; a right feeding port communicating with the inner cavity of the material distribution cylinder is provided at the bottom right end of the material distribution cylinder, and a right feeding valve is provided at the right feeding port, the outlet of which is connected to the feeding port of the right hot washing pot.

[0011] The inner cavity of the material distribution cylinder is equipped with a material distribution and conveying device that sends the material entering from the feed port to the left feed port and the right feed port respectively.

[0012] By vertically distributing the horizontal material conveying equipment, hot washing pot, and separation filter chamber in space, we can improve the utilization rate of vertical space, reduce the occupancy of horizontal space, improve the overall space utilization rate, and make the overall structure more compact and easier to integrate and manage.

[0013] Furthermore, in the aforementioned food-grade plastic sheet washing system, the structure of the material dispensing and conveying device includes: a material dispensing screw, which is supported and disposed in the inner cavity of the material dispensing cylinder by a first bearing assembly, and the material dispensing screw is driven to rotate by a first driving device;

[0014] A first continuous spiral blade is provided at the left end to the center of the distributing screw, and a second continuous spiral blade is provided at the right end to the center of the distributing screw; or a plurality of first discontinuous spiral blades are evenly spaced along the left spiral trajectory at the left end to the center of the distributing screw, and a plurality of second discontinuous spiral blades are evenly spaced along the right spiral trajectory at the right end to the center of the distributing screw.

[0015] The first continuous spiral blade rotates in the opposite direction to the second continuous spiral blade, or the left spiral rotates in the opposite direction to the right spiral, so that when the distribution screw is driven to rotate by the first drive device, it can transport the material in the inner cavity of the distribution cylinder from the center to the left and right discharge ports on the left and right sides.

[0016] A feeding hopper is provided at the feeding port of the distributing cylinder, and a feeding screw conveyor is provided on the frame. The outlet of the feeding screw conveyor is connected to the inlet of the feeding hopper.

[0017] The material from the previous stage is divided by a material distribution and conveying device and sent to two hot washing tanks for hot washing to improve the efficiency of hot washing.

[0018] In addition to the structure described above, the material distribution and conveying device may also have the following structure: The structure of the material distribution and conveying device includes: a left material distribution screw and a right material distribution screw;

[0019] The left feeding screw is supported by a left bearing assembly and is located in the left part of the inner cavity of the feeding cylinder, and the left feeding screw is driven to rotate by a left driving device.

[0020] The right-side feeding screw is supported by a right-side bearing assembly and is located on the right side of the inner cavity of the feeding cylinder, and the right-side feeding screw is driven to rotate by a right-side driving device.

[0021] A continuous left spiral blade is provided on the left feeding screw and a continuous right spiral blade is provided on the right feeding screw; or a number of discontinuous left spiral blades are evenly spaced along the left spiral trajectory on the left feeding screw and a number of discontinuous right spiral blades are evenly spaced along the right spiral trajectory on the right feeding screw.

[0022] When the left-side feeding screw rotates under the drive of the left-side drive device, it can convey the material in the inner cavity of the feeding cylinder from the center to the left-side discharge port. When the right-side feeding screw rotates under the drive of the right-side drive device, it can convey the material in the inner cavity of the feeding cylinder from the center to the right-side discharge port.

[0023] Furthermore, in the aforementioned food-grade plastic sheet washing system, this solution uses an additional hot washing pot to improve cleaning efficiency. However, the number of hot washing pots is not necessarily better the more there are. It is also necessary to consider comprehensive factors such as the cost of the hot washing pot itself and the material-carrying capacity of subsequent supporting equipment. Therefore, using two hot washing pots is the best option here.

[0024] Furthermore, to further improve the hot washing efficiency and effect of the hot washing tank, this solution designs the structure of the hot washing tank, as shown below. The structure of the hot washing tank includes: a hot washing drum body horizontally arranged on a first frame, and a detergent adding system for adding detergent into the inner cavity of the hot washing drum body is provided on the hot washing drum body;

[0025] A hot water inlet communicating with the inner cavity of the hot washing cylinder is provided on the hot washing cylinder body;

[0026] A feeding port communicating with the inner cavity of the hot washing cylinder is provided at the top center of the hot washing cylinder.

[0027] A discharge port communicating with the inner cavity of the hot washing cylinder is provided at the bottom center of the hot washing cylinder. A discharge valve is installed at the discharge port, and the outlet of the discharge valve is the material output port of the hot washing tank.

[0028] A side cleaning port communicating with the inner cavity of the hot washing cylinder is provided at the bottom left and right ends of the hot washing cylinder, and a side cleaning valve is installed at each side cleaning port.

[0029] The stirring shaft is supported in the inner cavity of the hot washing cylinder by a second bearing assembly, and the stirring shaft is driven to rotate forward or in reverse by a second driving device.

[0030] A first feeding and stirring structure with stirring and feeding functions is provided on the left side of the stirring shaft, and a second feeding and stirring structure with stirring and feeding functions is provided on the right side of the stirring shaft; and the feeding directions of the first feeding and stirring structure and the second feeding and stirring structure are opposite when the stirring shaft rotates.

[0031] Furthermore, in the aforementioned food-grade plastic sheet washing system, the first feeding and stirring structure is as follows: a plurality of first discontinuous spiral blades are arranged at intervals along the first spiral trajectory from the center position of the stirring shaft to the left, and a plurality of first pear knives are arranged at intervals along the first spiral trajectory from the center position of the stirring shaft to the left.

[0032] The second feeding and stirring structure is as follows: a plurality of second discontinuous spiral blades are arranged at intervals along the second spiral trajectory from the center position of the stirring shaft to the right; and a plurality of second pear blades are arranged at intervals along the second spiral trajectory from the center position of the stirring shaft to the right.

[0033] Furthermore, the direction of rotation of the first spiral trajectory is opposite to that of the second spiral trajectory.

[0034] During the hot washing process, the optimal ratio of material to cleaning solution in the hot washing drum is: material accounts for two-thirds, and the cleaning solution, which is a mixture of washing liquid and hot water, accounts for one-third. The material is stirred and hot washed at a temperature of 85-90℃.

[0035] The feeding process of the hot washing tank is as follows: the stirring shaft rotates so that the conveying direction of the first feeding stirring structure is from the center of the inner cavity of the hot washing tank to the left, and the conveying direction of the second feeding stirring structure is from the center of the inner cavity of the hot washing tank to the right. The material enters the middle of the inner cavity of the hot washing tank through the feeding port, and then is dispersed and tumbled to the left and right sides through the first feeding stirring structure and the second feeding stirring structure.

[0036] The hot washing tank discharge process is as follows: the rotation direction of the stirring shaft is opposite to the rotation direction of the stirring shaft during feeding, so that the conveying direction of the first feeding stirring structure is from the left side of the inner cavity of the hot washing tank to the center, and the conveying direction of the second feeding stirring structure is from the right side of the inner cavity of the hot washing tank to the center. The material is turned over and collected from the left and right sides to the center. The discharge valve is opened, and the material mixed with the washing liquid is discharged from the discharge valve.

[0037] The hot washing pot slag removal process is as follows: the rotation direction of the stirring shaft is the same as the rotation direction of the stirring shaft during feeding, so that the conveying direction of the first feeding stirring structure is from the center of the inner cavity of the hot washing cylinder to the left, and the conveying direction of the second feeding stirring structure is from the center of the inner cavity of the hot washing cylinder to the right. The residue is shoveled out by the first plow and the second plow and pushed to the side slag removal ports on the left and right sides respectively, and the slag is discharged from the side slag removal valves on the left and right sides.

[0038] Furthermore, in the aforementioned food-grade plastic sheet washing system, in order to improve the slag removal effect, this solution also designs a purging structure based on 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 spaced apart on the circumferential sidewall of the stirring shaft.

[0039] One end of the stirring shaft is driven by a second driving device, and the other end of the stirring shaft is provided with a rotary valve that connects to a compressed air pipe to communicate with the central channel.

[0040] During the slag removal process inside 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 rotary valve, and is then sprayed into the inner cavity of the hot washing cylinder through various air blowing holes to purge the inner cavity. This method, which combines the use of a plow blade to remove residue with compressed air purging, can improve the slag removal efficiency and effect.

[0041] Furthermore, in the aforementioned food-grade plastic sheet washing system, at least one hot washing cylinder vent is provided at the top of the hot washing cylinder, which communicates with the inner cavity of the hot washing cylinder.

[0042] A pH sensor is installed on the hot washing drum body to detect the detergent content in the cleaning fluid inside the hot washing drum body.

[0043] A thermocouple for detecting the temperature of the cleaning fluid inside the hot washing cylinder is provided on the hot washing cylinder body.

[0044] The detergent addition system is structured as follows: a liquid detergent addition port communicating with the inner cavity of the hot washing drum is provided on the hot washing drum body; each hot washing tank is matched with a dosing tank, and the liquid detergent addition port of each hot washing tank is connected to the outlet of the corresponding dosing tank through its corresponding dosing pipe; each dosing pipe is equipped with a first valve with a first flow meter and a first water pump; a powder detergent addition port communicating with the inner cavity of the hot washing drum body is provided on the hot washing drum body, and a screw conveyor is provided at the powder detergent addition port;

[0045] It is also equipped with a hot water supply tank. The hot water inlet of each hot washing pot is connected to the hot water outlet of the hot water supply tank through its corresponding hot water pipe. Each hot water pipe is equipped with a second valve with a second flow meter and a second water pump.

[0046] Furthermore, in the aforementioned food-grade plastic sheet washing system, the separation and filtration chamber comprises: a chamber body; the chamber body has a separation cavity and a filtration cavity, the filtration cavity being located below the separation cavity, and the separation cavity communicating with the filtration cavity through a plurality of filtration holes;

[0047] A feed inlet communicating with the separation cavity is provided at the top of the silo body, and the feed inlet is the material feed inlet of the separation and filtration silo; a discharge outlet communicating with the separation cavity is provided at the bottom of the silo body, and a discharge valve is installed at the discharge outlet; a feeding device is provided in the separation cavity to send the material entering from the feed inlet to the discharge outlet.

[0048] A bottom cleaning port communicating with the filter cavity is provided at the bottom of the chamber, and a bottom cleaning valve is installed at the bottom cleaning port; a cleaning device for cleaning the filter cavity is provided in the filter cavity.

[0049] Furthermore, in the aforementioned food-grade plastic sheet washing system, the feeding device includes: a rotating shaft, which is horizontally supported in the separation cavity by a third bearing assembly, and the rotating shaft is driven to rotate by a third drive device; a conveying screw belt is mounted on the rotating shaft by several support rods, and the direction of rotation of the conveying screw belt allows the material entering from the feed inlet to be conveyed out towards the discharge outlet during the rotation of the rotating shaft;

[0050] The feed inlet is located at the top center of the separation cavity, and the discharge outlet is located at the bottom left or bottom right end of the separation cavity.

[0051] A screw conveyor for feeding is installed on the main frame, and the inlet of the screw conveyor for feeding is connected to the outlet of the discharge valve.

[0052] Furthermore, in the aforementioned food-grade plastic sheet washing system, the structure of the slag removal device includes: a slag removal screw, which is horizontally supported in the filter cavity by a fourth bearing assembly, and the slag removal screw is driven to rotate by a fourth drive device;

[0053] 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 and fourth continuous spiral blades.

[0054] The rotation direction of the third continuous spiral blade is opposite to that of the fourth continuous spiral blade, and when the cleaning screw is driven to rotate by the fourth drive device, it can gather the impurities accumulated in the filter cavity from the left and right sides toward the bottom cleaning port in the center and discharge them.

[0055] The beneficial effects of the present invention are: ① The use of two hot washing pots improves the hot washing efficiency, and the spatial layout of the two hot washing pots, the separation and filtration chamber, and the horizontal material conveying equipment can improve the vertical space utilization rate and reduce the horizontal space occupancy rate, thereby improving the overall space utilization rate and making the overall structure more compact and easier to integrate and manage.

[0056] ② The stirring in the hot washing pot uses a plow blade. The plow blade has the advantages of low resistance, large blade area, and the ability to scoop up materials smoothly. It can reduce energy consumption and improve the material turning ability. Combined with the horizontal hot washing pot, the material is turned over and moves from the center to the left and right sides at the same time through the combination of two-stage intermittent spiral blades and plow blade. This ensures that the material is fully in contact with the cleaning liquid and is fully turned over, thereby improving the cleaning effect. Moreover, there is no need to extend the cleaning time. The cleaning efficiency is high and energy consumption can be further reduced.

[0057] ③ The hot washing cylinder is cleaned by a combination of two-stage intermittent spiral blades, plow blades and compressed air purging. There are basically no residues attached to the hot washing cylinder, and the cleaning is convenient and thorough.

[0058] ④ The separation and filtration chamber can serve as both a material buffer and a coarse filter, removing most of the cleaning liquid and powder from the material, thus laying the foundation for subsequent dehydration efficiency. Attached Figure Description

[0059] Figure 1 This is a three-dimensional structural schematic diagram of a food-grade plastic sheet fine washing system according to the present invention.

[0060] Figure 2 yes Figure 1 A schematic diagram of the structure of a medium-level material conveying equipment.

[0061] Figure 3 yes Figure 2 A schematic diagram of the internal structure of a medium-level material conveying equipment.

[0062] Figure 4 This is a schematic diagram of another structure for a horizontal material conveying device.

[0063] Figure 5 This is a schematic diagram of the structure of a hot washing pot.

[0064] Figure 6 yes Figure 5 A schematic diagram of the internal structure of a medium-heat washing pot.

[0065] Figure 7 yes Figure 5 A schematic diagram of the partial structure viewed from the right.

[0066] Figure 8 This is a schematic diagram of the stirring shaft.

[0067] Figure 9 This is a schematic diagram of the separation filter chamber.

[0068] Figure 10 yes Figure 9 A magnified schematic diagram of part A in the middle.

[0069] Figure 11 yes Figure 9 A magnified schematic diagram of part B in the middle section.

[0070] Figure 12 This is a schematic diagram of the structure of the rotating shaft and the conveyor belt on it.

[0071] in:

[0072] 1. Main frame; 11. Separation layer; 12. Screw conveyor for feeding; 13. Front feeding hopper; 14. Ladder; 15. Fence;

[0073] 2. Hot washing drum; 201. Left hot washing pot; 202. Right hot washing pot; 203. First frame; 21. Hot washing drum vent; 22. Liquid detergent addition port; 221. First pipeline; 222. First flow meter; 223. First valve; 23. Dosing tank; 24. Screw conveyor; 25. Hot water supply tank; 251. Hot water pipeline; 26. Feeding port; 27. Discharge port; 271. Discharge valve; 28. Left slag removal port; 281. Left slag removal valve; 29. ​​Right slag removal port; 291. Right slag removal valve;

[0074] 3. Separation and filtration chamber; 31. Chamber body; 32. Separation cavity; 33. Filtration cavity; 34. Filter hole; 35. Feed inlet; 36. Discharge outlet; 361. Discharge valve; 37. Mounting base; 38. Third drive motor; 381. Coupling; 39. Bottom slag removal port; 391. Bottom slag removal valve; 3100. Upper vent;

[0075] 4. Horizontal material distribution and conveying equipment; 41. Material distribution cylinder; 411. Feed inlet; 412. Left discharge inlet; 413. Right discharge inlet; 42. Material distribution screw; 421. First continuous spiral blade; 422. Second continuous spiral blade; 43. First drive motor; 44. First chain drive; 45. Feed hopper; 46. Left material distribution screw; 461. Left continuous spiral blade; 462. Left drive motor; 463. Left chain drive; 47. Right material distribution screw; 471. Right continuous spiral blade; 472. Right drive motor; 473. Right chain drive; 48. Second frame;

[0076] 5. Stirring shaft; 501. Left bearing support; 502. Right bearing support; 51. Second drive motor; 52. First intermittent spiral blade; 53. First pear blade; 54. Second intermittent spiral blade; 55. Second pear blade; 56. Air blowing hole; 57. Rotary valve;

[0077] 6. Rotating shaft; 61. Conveyor belt; 62. Support rod;

[0078] 7. Slag-cleaning screw; 71. Third continuous spiral blade; 72. Fourth continuous spiral blade; 73. Smooth section without spiral blades in the middle; 74. Fourth drive motor; 75. Side chain drive. Detailed Implementation

[0079] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, the exemplary embodiments described may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will enable those skilled in the art to fully understand the scope of this disclosure.

[0080] Where there is no conflict, the various embodiments of this disclosure and the features thereof in the embodiments may be combined with each other. Example 1

[0081] The food-grade plastic sheet washing system described in this embodiment, such as Figure 1 As shown, it includes: a main rack 1, the main rack 1 having a partition layer 11, the partition layer 11 dividing the main rack 1 into upper and lower regions: an upper region and a lower region;

[0082] The main frame 1 is also equipped with ladders 14 for workers to reach the required work area. Multiple ladders 14 can be installed, and the design can be customized according to actual needs. The main frame 1 is also equipped with a fence 15, which is also designed according to actual requirements.

[0083] Two hot washing pots for hot washing materials are provided in the upper area: a left hot washing pot 201 and a right hot washing pot 202. Both hot washing pots are set on the partition layer 11 through their respective first frames 203. The optimal arrangement of the two hot washing pots is from left to right.

[0084] A separation filter chamber 3 for filtering materials is provided in the lower area, and the material output ports of the two hot washing pots are connected to the material inlet of the separation filter chamber 3.

[0085] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the food-grade plastic sheet washing system described in this embodiment also includes: a horizontal material conveying device 4;

[0086] The structure of the horizontal material distribution and conveying device 4 includes: a material distribution cylinder 41, which is mounted above two hot washing pots via a second frame 48; a feed inlet 411 communicating with the inner cavity of the material distribution cylinder 41 is provided at the top center of the material distribution cylinder 41; a left discharge inlet 412 communicating with the inner cavity of the material distribution cylinder 41 is provided at the bottom left end of the material distribution cylinder 41, and a left discharge valve is provided at the left discharge inlet 412, the outlet of which is connected to the feeding port of the left hot washing pot 201; a right discharge inlet 413 communicating with the inner cavity of the material distribution cylinder 41 is provided at the bottom right end of the material distribution cylinder 41, and a right discharge valve is provided at the right discharge inlet 413, the outlet of which is connected to the feeding port of the right hot washing pot 202.

[0087] The inner cavity of the material distribution cylinder 41 is provided with a material distribution and conveying device that sends the material entering from the feed port 411 to the left feed port 412 and the right feed port 413 respectively.

[0088] like Figure 4 As shown, the structure of the material distributing and conveying device in this embodiment includes: a material distributing screw 42, which is supported in the inner cavity of the material distributing cylinder 41 by a first bearing assembly. The material distributing screw 42 is driven to rotate by a first driving device, which is a first driving motor 43. The output shaft of the first driving motor 43 is connected to the input shaft of the first chain drive 44, and the output shaft of the first chain drive 44 is connected to one end of the material distributing screw 42.

[0089] A first continuous spiral blade 421 is provided from the left end to the center of the distributing screw 42, and a second continuous spiral blade 422 is provided from the right end to the center of the distributing screw 42. In addition to continuous spiral blades, discontinuous spiral blades can also be used on the distributing screw 42. Specifically, several first discontinuous spiral blades are evenly spaced along the left spiral trajectory from the left end to the center of the distributing screw 42, and several second discontinuous spiral blades are evenly spaced along the right spiral trajectory from the right end to the center of the distributing screw 42. The specific type of spiral blade used depends on actual needs.

[0090] When using continuous helical blades, such as Figure 4 As shown, the rotation direction of the first continuous spiral blade 421 is opposite to that of the second continuous spiral blade 422, and the direction of the first driving device drives the material distribution screw 42 to be conveyed from the center to the left discharge port 412 and the right discharge port 413 on the left and right sides when the material distribution screw 42 is driven to rotate by the first driving device.

[0091] When intermittent spiral blades are used, the spiral direction of the left spiral trajectory is opposite to that of the right spiral trajectory, so that when the material distribution screw 42 is driven to rotate by the first drive device, it can transport the material in the inner cavity of the material distribution cylinder 42 from the center to the left and right discharge ports 412 and 413 on the left and right sides.

[0092] In addition to the structure described above, the material distribution and conveying device may also employ the following structure. The structure of the material distribution and conveying device includes: a left material distribution screw 46 and a right material distribution screw 47;

[0093] The left feeding screw 46 is supported by a left bearing assembly and is located on the left side of the inner cavity of the feeding cylinder 41. The left feeding screw 46 is driven to rotate by a left driving device. The left driving device is 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. The output shaft of the left chain drive 463 is connected to the left end of the left feeding screw 46.

[0094] The right-side feeding screw 47 is supported by a right-side bearing assembly and is located on the right side of the inner cavity of the feeding cylinder 41. The right-side feeding screw 47 is driven to rotate by a right-side driving device. The right-side driving device is a right-side driving motor 472. The output shaft of the right-side driving motor 472 is connected to the input shaft of the right-side chain drive 473, and the output shaft of the right-side chain drive 473 is connected to the left end of the right-side feeding screw 47.

[0095] A continuous left-side spiral blade 461 is provided on the left-side feeding screw 46, and a continuous right-side spiral blade 471 is provided on the right-side feeding screw 47; or a plurality of discontinuous left-side spiral blades are evenly spaced along the left-side spiral trajectory on the left-side feeding screw 46, and a plurality of discontinuous right-side spiral blades are evenly spaced along the right-side spiral trajectory on the right-side feeding screw 47; the specific type of spiral blade is selected according to actual needs. When the left-side drive device drives the left-side feeding screw 46 to rotate, and the right-side drive device drives the right-side feeding screw 47 to rotate, the material fed into the inner cavity of the feeding cylinder 41 from the feed port 411 is diverted to the left and right sides under the drive of the left-side feeding screw 46 and the right-side feeding screw 47, and then discharged from the left-side discharge port 412 and the right-side discharge port 413.

[0096] To facilitate feeding materials into the feeding port 411 of the distributing cylinder 41, this embodiment also provides a conical feeding hopper 45 with a large opening at the upper end and a small opening at the lower end at the feeding port of the distributing cylinder 41. A feeding screw conveyor 12 is provided on the main frame 1, and the outlet of the feeding screw conveyor 12 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 feeding screw conveyor 12 to connect to the output port of the previous process.

[0097] The food-grade plastic sheet washing system described in this embodiment uses two hot washing tanks to improve the hot washing efficiency. The spatial layout of the two hot washing tanks, the separation filter chamber 3, and the horizontal material conveying equipment can improve the vertical space utilization rate and reduce the horizontal space occupation rate, thereby improving the overall space utilization rate and making the overall structure more compact and easier to integrate and manage. In addition, the addition of the separation filter chamber to the washing system to perform coarse filtration on the hot-washed material can improve the subsequent dewatering efficiency and dewatering effect. Example 2

[0098] This embodiment is based on the design of the hot washing pot structure in Embodiment 1, in order to improve the hot washing efficiency and hot washing effect of the hot washing pot.

[0099] The hot washing pot described in this embodiment, such as Figure 5 As shown, it includes: a hot washing drum body 2 disposed on a first frame 203, the hot washing drum body being placed horizontally, and a detergent adding system for adding detergent into the inner cavity of the hot washing drum body 2 being disposed on the hot washing drum body 2. In this embodiment, the detergent adding system includes a liquid detergent adding system and a powder detergent adding system.

[0100] The liquid detergent dispensing system is as follows: Figure 5 and Figure 7 As shown, a liquid detergent inlet 22 communicating with the inner cavity of the hot washing drum 2 is provided on the hot washing drum 2. A first pipe 221 is provided at the liquid detergent inlet 22. A first valve 223 with a first flow meter 222 is installed on the first pipe 221. Liquid detergent is added into the inner cavity of the hot washing drum 2 through the first pipe 221. Liquid detergent is usually stored in a dosing tank 23. Two dosing tanks 23 are installed on the main frame 1. Each hot washing pot corresponds to one dosing tank 23. A first water pump can be provided for the first pipe 221 of each hot washing pot. The first water pump draws out the liquid detergent in the corresponding dosing tank 23 and sends it to the hot washing pot.

[0101] The powder detergent addition system is as follows: Figure 5 As shown, a powder detergent inlet communicating with the inner cavity of the hot washing cylinder 2 is provided on the hot washing cylinder 2. A screw conveyor 24 is provided at the powder detergent inlet. The screw conveyor 24 is a common conveying device. This solution uses the screw conveyor 24 to feed the powder detergent, and does not innovate the structure of the screw conveyor 24. Therefore, the structure of the screw conveyor 24 will not be described in detail here.

[0102] In this embodiment, as Figure 1As shown, a hot water inlet communicating with the inner cavity of the hot washing drum 2 is provided on the hot washing drum 2. A hot water pipe 251 is provided at the hot water inlet, and a second valve with a second flow meter is installed on the hot water pipe 251. Hot water is added into the inner cavity of the hot washing drum 2 through the hot water pipe 251. Hot water can be directly introduced into the hot water pipe 251 from the hot water supply equipment, or a hot water supply tank 25 can be provided. This embodiment takes the setting of the hot water supply tank 25 as an example. A hot water supply tank 25 is installed on the main frame 1. 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 washing pots are connected to the corresponding hot water outlets on the hot water supply tank 25 through their respective hot water pipes 251. When hot water is needed, the hot water in the hot water supply tank 25 is drawn out by the corresponding second water pump and sent to the corresponding hot water pipe 251, and then enters the corresponding hot washing pot through the corresponding hot water pipe 251.

[0103] In this embodiment, as Figure 5 and Figure 6 As shown, a feeding port 26 communicating with the inner cavity of the hot washing cylinder 2 is provided at the top center of the hot washing cylinder 2.

[0104] A discharge port 27 communicating with the inner cavity of the hot washing cylinder 2 is provided at the center of the bottom. A discharge valve 271 is installed at the discharge port 27. The discharge valve 271 is closed during the hot washing and slag removal processes, and is only open during the discharge process. In this embodiment, the outlet of the discharge valve 271 is the material output port of the hot washing pot described in Embodiment 1.

[0105] At the bottom left and right ends of the hot washing cylinder 2, there are side slag removal ports communicating with the inner cavity of the hot washing cylinder 2. A side slag removal valve is installed at each side slag removal port. For ease of description, the side slag removal port and side slag removal valve located on the left side are referred to as left slag removal port 28 and left slag removal valve 281, and the side slag removal port and side slag removal valve located on the right side are referred to as right slag removal port 29 and right slag removal valve 291. The left slag removal port 28 and the right slag removal port 29 are closed during the hot washing process and during the material discharge process, and are only opened during the slag removal process.

[0106] The stirring shaft 5 is supported in the inner cavity of the hot washing cylinder 2 by a second bearing seat assembly. In this embodiment, a left bearing support 501 is fixedly installed at the left end of the hot washing cylinder 2, and a right bearing support 502 is fixedly installed at the right end of the hot washing cylinder 2. The left end of the stirring shaft 5 passes through the left through hole of the hot washing cylinder 2 and is supported in the bearing inside the left bearing support 501. The right end of the stirring shaft 5 passes through the right through hole of the hot washing cylinder 2 and is supported in the bearing inside the right bearing support 502. The stirring shaft 5 is driven to rotate forward or backward by a second drive device, which is a second drive motor 51. The motor shaft of the second drive motor 51 is fixedly connected to one end of the stirring shaft 5.

[0107] A first feeding and stirring structure with stirring and feeding functions is provided on the left side of the stirring shaft 5, and a second feeding and stirring structure with stirring and feeding functions is provided on the right side 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. Therefore, when the stirring shaft 5 is driven to rotate forward or reverse by the driving device, the material in the inner cavity of the hot washing cylinder 2 can move from the left and right sides to the center at the same time or from the center to the left and right sides at the same time through the first feeding and stirring structure and the second feeding and stirring structure.

[0108] The first feeding and stirring structure is as follows: Figure 6 and Figure 8 As shown, a plurality of first discontinuous spiral blades 52 are arranged at intervals along the first spiral trajectory from the center position of the stirring shaft 5 to the left, and a plurality of first pear blades 53 are arranged at intervals along the first spiral trajectory from the center position of the stirring shaft 5 to the left.

[0109] The second feeding and stirring structure is as follows: a plurality of second discontinuous spiral blades 54 are arranged at intervals along the second spiral trajectory from the center position of the stirring shaft 5 to the right, and a plurality of second pear blades 55 are arranged at intervals along the second spiral trajectory from the center position of the stirring shaft 5 to the right.

[0110] Among them, the first discontinuous spiral blade 52 and the second discontinuous spiral blade 54 are strip-shaped structures.

[0111] The first and second helical trajectories rotate in opposite directions, thus ensuring that when the stirring shaft 5 rotates, the conveying directions of the first and second feeding stirring structures are opposite. Assuming that when the stirring shaft 5 rotates clockwise, the first feeding stirring structure conveys material from the center of the inner cavity of the hot washing cylinder 2 to the left, then the second feeding stirring structure conveys material from the center of the inner cavity of the hot washing cylinder 2 to the right. This allows the material in the inner cavity of the hot washing cylinder 2 to be conveyed to both sides. Conversely, when the stirring shaft 5 rotates counterclockwise, the first feeding stirring structure conveys material from the left side of the inner cavity of the hot washing cylinder 2 to the center, and the second feeding stirring structure conveys material from the right side of the inner cavity of the hot washing cylinder 2 to the center. This allows the material in the inner cavity of the hot washing cylinder 2 to be collected towards the center.

[0112] During feeding, the stirring shaft 5 rotates so that the conveying direction of the first feeding 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 stirring structure is from the center of the inner cavity of the hot washing cylinder 2 to the right. The material enters the middle of the inner cavity of the hot washing cylinder 2 through the feeding port 26, and then is dispersed and tumbled to the left and right sides through the first feeding stirring structure and the second feeding stirring structure.

[0113] During discharge, the rotation direction of the stirring shaft 5 is opposite to that during feeding, so that the conveying direction of the first feeding stirring structure is from the left side of the inner cavity of the hot washing cylinder 2 to the center, and the conveying direction of the second feeding stirring structure is from the right side of the inner cavity of the hot washing cylinder 2 to the center, so that the material is turned over and collected towards the center. Then, the discharge valve 271 is opened, and the material mixed with the washing liquid is discharged from the discharge valve 271.

[0114] The mixing process utilizes plow blades, which offer advantages such as low resistance, large blade area, and the ability to easily scoop up materials. This reduces energy consumption and enhances material agitation. Combined with a horizontally positioned hot washing pot, the two-stage intermittent spiral blades and plow blades work together to tumble the material and simultaneously move it from the center to the left and right sides, as well as from the left and right sides to the center. This ensures that the material is in full contact with the cleaning liquid and is thoroughly agitated, thereby improving the cleaning effect without extending the cleaning time. This results in high cleaning efficiency and further reduces energy consumption.

[0115] After the cleaning liquid and materials in the hot washing cylinder 2 are discharged through the discharge valve 271, a small amount of residue will remain inside the hot washing cylinder 2. To prevent the residue from adhering and accumulating, it is necessary to clean the residue inside the hot washing cylinder 2. During cleaning, the rotation direction of the stirring shaft 5 is the same as the rotation direction during feeding, so that the conveying direction of the first feeding 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 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 to the left cleaning valve 281 and the right cleaning valve 291 respectively. The residue is then cleared out of the hot washing cylinder 2 through the left cleaning valve 281 and the right cleaning valve 291, making the cleaning process very convenient.

[0116] To improve the slag removal effect, a preferred embodiment is to add a purging structure based on the above structure, specifically as follows: Figure 8 As shown, the stirring shaft 5 is a hollow shaft structure with a central channel. Several air-blowing holes 56 communicating with the central channel are spaced apart on the circumferential sidewall of the stirring shaft 5. Preferably, the air-blowing holes 56 are evenly distributed. One end of the stirring shaft 5 is connected to the second drive motor 51, and the other end is equipped with a rotary valve 57, which can be connected to a compressed air pipeline. During the slag removal process of 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 is then sprayed into the inner cavity of the hot washing cylinder 2 through each air-blowing hole 56, purging the inner cavity of the hot washing cylinder 2. The hot washing cylinder 2 is cleaned by a combination of two-stage intermittent spiral blades, a plow blade, and compressed air purging. There is virtually no residue adhering inside the hot washing cylinder 2, making slag removal convenient and highly effective.

[0117] In this embodiment, as Figure 5 As shown, at least one hot wash cylinder vent 21 communicating with the inner cavity of the hot wash cylinder is provided at the top of the hot wash cylinder 2. A sealing plate can be provided on the vent 21, and the sealing plate can be removed when ventilation is required.

[0118] In this embodiment, a pH detection sensor is installed on the hot washing drum 2 to detect the detergent content in the cleaning liquid inside the hot washing drum 2. The pH detection sensor can monitor the detergent content in the cleaning liquid inside the hot washing drum 2 in real time to ensure that the amount of detergent added meets the specified requirements.

[0119] In this embodiment, a thermocouple is installed on the hot washing cylinder 2 to detect the temperature of the cleaning fluid inside the hot washing cylinder 2. The temperature of the cleaning fluid inside the hot washing cylinder 2 is monitored in real time by the thermocouple to ensure that the temperature of the cleaning fluid meets the requirements of hot washing.

[0120] In this embodiment, a more preferred solution is to design the hot washing cylinder 2 as having a hollow jacket structure. The hot washing cylinder 2 is provided with a steam inlet and a steam outlet communicating with the hollow jacket. During the hot washing process, steam can be introduced into the hollow jacket for auxiliary heating to ensure the hot washing temperature. Example 3

[0121] This embodiment is based on the design of the separation filter chamber 3 in Embodiment 1, in order to improve the coarse filtration efficiency and coarse filtration effect.

[0122] The separation filter chamber 3 described in this embodiment, such as Figure 9 and Figure 10 As shown, it includes: a chamber 31; the chamber 31 has a separation cavity 32 and a filter cavity 33, the filter cavity 33 is located below the separation cavity 32, and the separation cavity 32 is connected to the filter cavity 33 through a plurality of filter holes 34.

[0123] A feed inlet 35 communicating with the separation cavity 32 is provided at the top of the silo body 31, and a discharge outlet 36 communicating with the separation cavity 32 is provided at the bottom of the silo body 1. A discharge valve 361 is installed at the discharge outlet 36. A feeding device is provided in the separation cavity 32 to send the material entering from the feed inlet 35 to the discharge outlet 36.

[0124] The material containing powder and other impurities, as well as cleaning liquid, output from the hot washing pot enters the separation cavity 32 of the bin 31 through the feed inlet 35. The cleaning liquid and powder and other impurities in the material enter the filter cavity 33 through the filter holes 34, while the material is retained in the separation cavity 32 and output from the bin 1 by the feeding device, thereby achieving the purpose of coarse filtration.

[0125] Preferably, each filter hole 34 is a round hole; a more preferred option is that each filter hole 34 is of the same size and is evenly spaced from the left end to the right end of the filter cavity 33. The optimal size of the filter hole 34 is selected with the following parameters: the diameter of the filter hole 34 is φ1.5~φ3mm.

[0126] There are various structural forms of feeding devices. Considering the inherent characteristics of the crushed waste plastic, i.e., plastic sheets, this solution selects a conveyor belt that causes less damage to the plastic sheets and has lower resistance. The specific structure is as follows: Figure 9 and Figure 12As shown, the structure of the feeding device includes: a rotating shaft 6, which is horizontally supported in the separation cavity 32 by a first bearing assembly. 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 screw belt 61 is set on the rotating shaft 6 by several support rods 62, and the rotation direction of the conveying screw belt 61 enables the material entering from the feed port 35 to be conveyed to the discharge port 36 through the conveying screw belt 61 during the rotation of the rotating shaft 6.

[0127] The support rods 62 are evenly spaced along the spiral direction of the conveyor belt 61.

[0128] The rotating shaft 6 can be a hollow shaft structure.

[0129] In this embodiment, the preferred layout of the inlet 35 and outlet 36 is as follows: the inlet 35 is located at the top center of the separation cavity 32, and the outlet 36 is located at the bottom left or bottom right of the separation cavity 32. Figure 9 As shown, the discharge port 36 is located at the bottom right end of the separation cavity 32. At this time, the right side of the filter cavity 33 is slightly shorter than the separation cavity 32 in order to avoid the discharge valve 361.

[0130] The third driving device is a third driving motor 38 mounted on the mounting base 37. The output shaft of the third driving motor 38 is fixedly connected to one end of the rotating shaft 6 extending from the first bearing assembly through a coupling 381.

[0131] like Figure 9 and Figure 10 As shown, in this embodiment, a bottom cleaning port 39 communicating with the filter cavity 33 is provided at the bottom of the chamber 31, and a bottom cleaning valve 391 is installed at the bottom cleaning port 39; a cleaning device for cleaning the filter cavity 33 is provided in the filter cavity 33, and the cleaning device can remove powder and other impurities that enter the filter cavity 33 through each filter hole 34 and remove them from the filter cavity 33.

[0132] There are various structural forms of slag removal devices. Considering factors such as slag removal efficiency and effect, energy consumption, etc., this solution selects a screw structure, such as... Figure 9 and Figure 10 As shown, the specific structure is as follows: The structure of the slag cleaning device includes: a slag cleaning screw 7, which is horizontally supported in the filter cavity 33 by a fourth bearing group. The filter 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.

[0133] The spiral blades on the cleaning screw 7 are divided into two continuous spiral blades. One section is the spiral blade from the left end of the cleaning screw 7 to the center of the cleaning screw 7, which is the third continuous spiral blade 71. The other section is the spiral blade from the right end of the cleaning screw 7 to the center of the cleaning screw 7, which is the fourth continuous spiral blade 72. The bottom cleaning port 39 is located in the section between the third continuous spiral blade 71 and the fourth continuous spiral blade 72, that is, below the bare rod section 73 without spiral blades in the middle.

[0134] The rotation direction of the third continuous spiral blade 71 is opposite to that of the fourth continuous spiral blade 72, and when the cleaning screw 7 is driven to rotate by the fourth drive device, it can gather the impurities accumulated in the filter cavity 33 from the left and right sides toward the central cleaning port 39 and discharge them.

[0135] Among them, such as Figure 11 As shown, the fourth drive device is a fourth drive motor mounted on the mounting base 37. The output shaft of the fourth drive 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.

[0136] Among them, the fourth drive motor 74 in the fourth drive unit and the third drive motor 38 in the third drive unit are usually geared motors.

[0137] In this embodiment, an upper vent 3100 communicating with the separation cavity 32 is provided on the top of the chamber 31, and the number of the upper vent 3100 is at least one.

[0138] The aforementioned separation and filtration chamber has advantages such as compact structure, convenient operation, and low energy consumption. It can not only serve as a material buffer and transition but also filter out about 80% of powder and other impurities and about 85% of the cleaning liquid in the material, laying the foundation for subsequent dehydration efficiency and dehydration effect.

[0139] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A food-grade plastic sheet washing system, comprising: The main frame is characterized in that: the main frame has a partition layer that divides the main frame into upper and lower areas; two hot washing pots for hot washing materials are arranged in the upper area: a left hot washing pot and a right hot washing pot, each hot washing pot being mounted on the partition layer via its corresponding first frame; a separation filter chamber for filtering materials is arranged in the lower area, with the material outlets of both hot washing pots connected to the material inlet of the separation filter chamber; a horizontal material distribution conveyor is also provided; the structure of the horizontal material distribution conveyor... The structure includes: a horizontally arranged distributing cylinder, which is mounted above two hot washing tanks via a second frame; a feeding port communicating with the inner cavity of the distributing cylinder is located at the center of the top of the distributing cylinder; a left feeding port communicating with the inner cavity of the distributing cylinder is located at the left bottom of the distributing cylinder, and a left feeding valve is located at the left feeding port, the outlet of which is connected to the feeding port of the left hot washing tank; and a right feeding port communicating with the inner cavity of the distributing cylinder is located at the right bottom of the distributing cylinder, and a right feeding valve is located at the right feeding port. The outlet of the feed valve is connected to the feed port of the right hot washing tank; a material distribution and conveying device is provided in the inner cavity of the distribution cylinder to send the material entering from the feed port to the left and right feed ports respectively; the structure of the hot washing tank includes: a hot washing cylinder horizontally arranged on the first frame, and a detergent adding system for adding detergent to the inner cavity of the hot washing cylinder; the structure of the separation and filtration chamber includes: a chamber body; the chamber body has a separation cavity and a filtration cavity, the filtration cavity is located below the separation cavity, and the separation cavity is connected to the feed port through several filter holes. The filter cavity is connected; a feed inlet communicating with the separation cavity is provided at the top of the chamber, and the feed inlet is the material feed inlet of the separation filter chamber; a discharge outlet communicating with the separation cavity is provided at the bottom of the chamber, and a discharge valve is installed at the discharge outlet; a feeding device is provided in the separation cavity to send the material entering from the feed inlet to the discharge outlet; a bottom slag removal port communicating with the filter cavity is provided at the bottom of the chamber, and a bottom slag removal valve is installed at the bottom slag removal port; a slag removal device is provided in the filter cavity to remove slag from the filter cavity.

2. The food-grade plastic sheet washing system according to claim 1, characterized in that: The material distribution and conveying device includes: a material distribution screw, which is supported by a first bearing assembly and installed in the inner cavity of the material distribution cylinder. The material distribution screw is driven to rotate by a first driving device. A first continuous spiral blade is provided from the left end to the center of the material distribution screw, and a second continuous spiral blade is provided from the right end to the center of the material distribution screw. Alternatively, a plurality of first discontinuous spiral blades are evenly spaced along the left spiral trajectory from the left end to the center of the material distribution screw, and a plurality of second discontinuous spiral blades are evenly spaced along the right spiral trajectory from the right end to the center of the material distribution screw. The rotation direction of the first continuous spiral blades is opposite to that of the second continuous spiral blades, or the rotation direction of the left spiral trajectory is opposite to that of the right spiral trajectory, so that when the material distribution screw is driven to rotate by the first driving device, it can convey the material in the inner cavity of the material distribution cylinder from the center to the left and right discharge ports on the left and right sides.

3. The food-grade plastic sheet washing system according to claim 1, characterized in that: The material distribution and conveying device comprises a left-side material distribution screw and a right-side material distribution screw. The left-side material distribution screw is supported by a left-side bearing assembly and is located on the left side of the inner cavity of the material distribution cylinder, and is driven to rotate by a left-side drive device. The right-side material distribution screw is supported by a right-side bearing assembly and is located on the right side of the inner cavity of the material distribution cylinder, and is driven to rotate by a right-side drive device. A left-side continuous helical blade is provided on the left-side material distribution screw, and a right-side continuous helical blade is provided on the right-side material distribution screw. The screw has continuous spiral blades; or several discontinuous spiral blades are evenly spaced along the left spiral direction on the left feeding screw and several discontinuous spiral blades are evenly spaced along the right spiral direction on the right feeding screw; when the left feeding screw rotates under the drive of the left driving device, it can convey the material in the inner cavity of the feeding cylinder from the center to the left discharge port, and when the right feeding screw rotates under the drive of the right driving device, it can convey the material in the inner cavity of the feeding cylinder from the center to the right discharge port.

4. The food-grade plastic sheet washing system according to claim 1, characterized in that: A hot water inlet communicating with the inner cavity of the hot washing drum is provided on the hot washing drum body; a feeding port communicating with the inner cavity of the hot washing drum body is provided at the center of the top of the hot washing drum body; a discharge port communicating with the inner cavity of the hot washing drum body is provided at the center of the bottom of the hot washing drum body, and a discharge valve is installed at the discharge port, the outlet of the discharge valve being the material output port of the hot washing pot; a side slag removal port communicating with the inner cavity of the hot washing drum body is provided at the left and right ends of the bottom of the hot washing drum body, and a side slag removal valve is installed at each side slag removal port; the stirring shaft is supported in the inner cavity of the hot washing drum body by a second bearing assembly, and the stirring shaft is driven to rotate forward or reverse by a second drive device; a first feeding stirring structure with stirring and feeding functions is provided on the left side of the stirring shaft, and a second feeding stirring structure with stirring and feeding functions is provided on the right side of the stirring shaft; and the feeding directions of the first feeding stirring structure and the second feeding stirring structure are opposite when the stirring shaft rotates.

5. The food-grade plastic sheet washing system according to claim 4, characterized in that: The first feeding and stirring structure consists of several first discontinuous spiral blades spaced at intervals along a first spiral trajectory from the center of the stirring shaft to the left, and several first pear blades spaced at intervals along the first spiral trajectory from the center of the stirring shaft to the left. The second feeding and stirring structure consists of several second discontinuous spiral blades spaced at intervals along a second spiral trajectory from the center of the stirring shaft to the right, and several second pear blades spaced at intervals along the second spiral trajectory from the center of the stirring shaft to the right. The rotation directions of the first and second spiral trajectories are opposite. The hot washing tank feeding process is as follows: the stirring shaft rotates so that the conveying direction of the first feeding and stirring structure is from the center of the inner cavity of the hot washing tank 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 tank to the right. The material enters the middle of the inner cavity of the hot washing tank through the feeding port, and then is dispersed and tumbled to the left and right sides by the first and second feeding and stirring structures. The hot washing pot discharge process is as follows: the rotation direction of the stirring shaft is opposite to the rotation direction of the stirring shaft during feeding, so that the conveying direction of the first feeding stirring structure is from the left side of the inner cavity of the hot washing cylinder to the center, and the conveying direction of the second feeding stirring structure is from the right side of the inner cavity of the hot washing cylinder to the center. The material is turned over and collected from the left and right sides to the center, and discharged from the discharge valve. The hot washing pot slag removal process is as follows: the rotation direction of the stirring shaft is the same as the rotation direction of the stirring shaft during feeding, so that the conveying direction of the first feeding stirring structure is from the center of the inner cavity of the hot washing cylinder to the left, and the conveying direction of the second feeding stirring structure is from the center of the inner cavity of the hot washing cylinder to the right. The residue is shoveled out by the first plow and the second plow and pushed to the side slag removal ports on the left and right sides respectively, and discharged from the side slag removal valves on the left and right sides.

6. A food-grade plastic sheet washing system according to claim 4 or 5, characterized in that: The stirring shaft is a hollow shaft structure with a central channel. Several 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 the other end of the stirring shaft is provided with a rotary valve that connects to a compressed air pipe to communicate with the central channel. During the cleaning process of 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 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.

7. The food-grade plastic sheet washing system according to claim 4, characterized in that: At least one vent for the hot washing drum body is provided at the top of the hot washing drum body and communicates with the inner cavity of the hot washing drum body; a pH sensor for detecting the detergent content in the cleaning fluid inside the hot washing drum body is provided on the hot washing drum body; a thermocouple for detecting the temperature of the cleaning fluid inside the hot washing drum body is provided on the hot washing drum body. The detergent addition system is structured as follows: a liquid detergent addition port communicating with the inner cavity of the hot washing drum is provided on the hot washing drum body; each hot washing drum is matched with a dosing tank, and the liquid detergent addition port of each hot washing drum is connected to the outlet of the corresponding dosing tank through its corresponding dosing pipe, and each dosing pipe is equipped with a first valve with a first flow meter and a first water pump; a powder detergent addition port communicating with the inner cavity of the hot washing drum body is provided on the hot washing drum body, and a screw conveyor is provided at the powder detergent addition port; a hot water supply tank is also provided, and the hot water inlet of each hot washing drum is connected to the hot water outlet of the hot water supply tank through its corresponding hot water pipe, and each hot water pipe is equipped with a second valve with a second flow meter and a second water pump.

8. The food-grade plastic sheet washing system according to claim 1, characterized in that: The feeding device includes: a rotating shaft, which is horizontally supported in the separation cavity by a third bearing assembly and driven to rotate by a third drive device; a conveying screw belt is mounted on the rotating shaft by several support rods, and the direction of rotation of the conveying screw belt allows the material entering from the feed inlet to be conveyed to the discharge outlet during the rotation of the rotating shaft; the feed inlet is located at the top center of the separation cavity, and the discharge outlet is located at the bottom left or bottom right end of the separation cavity.

9. The food-grade plastic sheet washing system according to claim 1, characterized in that: The structure of the slag removal device includes: a slag removal screw, which is horizontally supported in the filter cavity by a fourth bearing assembly, and is driven to rotate by a fourth drive device; the spiral blades from the left end to the center of the slag removal screw are third continuous spiral blades, and the spiral blades from the right end to the center of the slag removal screw are fourth continuous spiral blades; the bottom slag removal port is located below the section between the third and fourth continuous spiral blades; the rotation direction of the third continuous spiral blades is opposite to that of the fourth continuous spiral blades, and when the slag removal screw is driven to rotate by the fourth drive device, it can gather the impurities accumulated in the filter cavity from the left and right sides towards the bottom slag removal port in the center for discharge.

Images