A pre-treatment system for film cleaning and recovery and a method thereof

Abstract

The application discloses a kind of film cleaning recovery pretreatment system and method thereof, belong to environmental protection equipment technical field.Pretreatment system includes the preliminary crushing treatment of waste and old film material preliminary crushing device, and the water sorting device of waste and old film material preliminary cleaning treatment;Preliminary crushing device is connected with water sorting device by a belt conveyor;Water sorting device includes a sorting water tank for containing water, and the heavy object conveyor belt, film conveyor belt, water inlet assembly and drainage assembly arranged in sorting water tank;Water is injected into sorting water tank, under the impact of water, material is divided into light substance and hard impurities;Heavy object conveyor belt is used to convey hard impurities, and film conveyor belt is used to convey light substance;Water sorting device further includes automatic control module for monitoring and controlling water level in sorting water tank;So that iron products, sandstone and other hard impurities are effectively removed before crushing, thereby greatly reducing the wear rate of crusher cutter, prolonging the service life of cutter roll structure.

Description

Technical Field

[0001] This invention belongs to the field of environmental protection equipment technology, specifically relating to a pretreatment system and method for membrane cleaning and recycling. Background Technology

[0002] Urban waste, an unavoidable byproduct of urban metabolism, is complex and diverse, encompassing three main categories: industrial waste, construction waste, and household waste. With the accelerated pace of urbanization, the rapid development of new projects, large-scale renovations and demolitions of old urban areas, and frequent road repairs and reconstructions all generate substantial amounts of construction waste. Simultaneously, the booming industrial sector has led to a dramatic increase in industrial waste, much of which contains harmful and non-biodegradable substances. Notably, all types of waste—household waste, industrial waste, and construction waste—contain large quantities of waste film. This film takes various forms, including common household plastic bags, packaging films, woven bags, and agricultural films widely used in agriculture. Because of their lightweight and easily scattered nature, improper disposal of these waste films not only pollutes the environment but also severely hinders the effective recycling of resources.

[0003] Currently, the recycling and processing of waste film generally includes steps such as crushing, washing, dewatering, and granulation. For example, Chinese patent CN102179883B discloses a film crushing and washing line, which includes a conveyor belt arranged sequentially, a crusher for crushing the film conveyed by the conveyor belt, a scrubbing machine for washing the film and removing impurities from the film, a washing and rinsing machine for completely separating the film from impurities, a dewatering machine for dewatering the washed film, a drying system for further drying the dewatered film, and a cyclone hopper for bagging.

[0004] While the aforementioned existing technologies can free workers from the harsh production environment of manual washing and automate production, directly feeding untreated waste film into the crusher for crushing results in severe wear and even breakage of the crusher's blades due to hard impurities such as iron and sand. Long-term operation can damage the crusher's roller structure and even the motor and reducer, increasing production line maintenance costs. Furthermore, insufficient washing and crushing will affect the efficiency of subsequent sorting and granulation. These problems not only limit the healthy development of the waste film recycling industry but also violate the basic principles of circular economy and sustainable development. In addition, while air classifiers are available for separating film, the dust and noise generated during the air classification process can seriously impact the surrounding environment and residents' lives.

[0005] Therefore, there is an urgent need for a pretreatment system and method for membrane cleaning and recycling to solve the problems of existing crusher cutter rollers easily breaking when encountering sand and gravel during crushing, high production line maintenance costs, serious environmental pollution, and low production efficiency. Summary of the Invention

[0006] To address the problems in related technologies, this invention proposes a pretreatment system and method for film cleaning and recycling, which overcomes the aforementioned technical problems existing in the prior art. By setting up a pre-crushing device and a water separation device, this invention effectively removes hard impurities such as iron products and sand from waste film materials before crushing, thereby greatly reducing the wear rate of crusher blades and extending the service life of crusher roller structure, motor reducer and other related equipment.

[0007] The technical solution of the present invention is implemented as follows: a pretreatment system for film cleaning and recycling, wherein the pretreatment system pretreats the waste film material before conveying it to a crusher for crushing.

[0008] The pretreatment system includes a pre-crushing device for preliminary crushing of waste film material and a water separation device for preliminary washing of waste film material; wherein, the pre-crushing device is connected to the water separation device via a belt conveyor; the top of the pre-crushing device is provided with an inlet for feeding waste film material; the belt conveyor transports the waste film material processed by the pre-crushing device to the water separation device.

[0009] The water separation device includes a separation tank for holding water, and a heavy conveyor belt, a film conveyor belt, a water inlet assembly, and a drainage assembly disposed within the separation tank. The separation tank also has a feed hopper for inputting waste film material, positioned above the heavy conveyor belt, with the water inlet assembly located on the feed hopper. The bottom of the separation tank has a discharge channel, with the drainage assembly located on the discharge channel. When water is injected into the separation tank, the waste film material is separated into light materials and hard impurities under the action of buoyancy. The light materials float to the top, while the hard impurities sink to the bottom of the separation tank.

[0010] The heavy conveyor belt is used to convey hard impurities, and the thin film conveyor belt is used to convey light materials; the hard impurities include iron products and sand and gravel, and the light materials include thin films; the heavy conveyor belt extends obliquely from the bottom of the sorting tank to one side of the top of the sorting tank, and the thin film conveyor belt extends obliquely from the other side of the top of the sorting tank to above the heavy conveyor belt.

[0011] The water separation device also includes an automatic control module for monitoring and controlling the water level in the separation tank. The automatic control module includes a main controller, a level gauge, and an alarm. The water inlet assembly includes a water pump, and the drainage assembly includes an electric rotary valve. The level gauge, alarm, water pump, and electric rotary valve are electrically connected to the main controller. The level gauge is located inside the separation tank.

[0012] Furthermore, the length of the heavy conveyor belt is greater than the length of the film conveyor belt, and the bottom of the film conveyor belt is not connected to the heavy conveyor belt; the film conveyor belt and the heavy conveyor belt are arranged in a Y-shape inside the sorting tank.

[0013] Furthermore, the film conveyor belt is a chain sprocket belt, and the film conveyor belt includes multiple chains arranged sequentially at equal intervals, with a hollow arrangement between adjacent chains;

[0014] The heavy-duty conveyor belt is a rubber belt, and multiple arc-shaped strips are evenly protruded on the side of the heavy-duty conveyor belt that contacts the waste film material.

[0015] Furthermore, the belt conveyor extends obliquely from the bottom of the pre-crushing device to the feed hopper; the belt conveyor includes a head end and an end end, the head end being located directly below the discharge port at the bottom of the pre-crushing device, and the end end being located directly above the feed hopper; a photoelectric switch is also provided at the end end, the photoelectric switch being electrically connected to a water pump; when waste film material is placed on the belt conveyor, the photoelectric switch detects the presence of waste film material, the photoelectric switch closes, the water pump adjusts the pumping frequency, thereby controlling the water flow speed in the sorting tank, and at the same time, the electric rotary valve is adjusted to keep the water level in the sorting tank at a set position.

[0016] Furthermore, the bottom of the heavy conveyor belt is also provided with a baffle to prevent hard impurities from sinking, and the surface of the baffle is provided with multiple drainage holes;

[0017] Furthermore, the bottom of the baffle is provided with an extension plate that extends to the surface of the heavy conveyor belt;

[0018] Furthermore, the sorting water tank has a recycling tank on the side where the membrane conveyor belt is located, and the side wall of the sorting water tank has multiple through holes that connect to the recycling tank; the bottom of the recycling tank is connected to the circulating water tank.

[0019] Furthermore, a first through-hole group and a second through-hole group are provided on the side wall of the sorting water tank; along the inclined direction of the side wall of the sorting water tank, the first through-hole group is located above the second through-hole group; the diameter of the through-hole in the first through-hole group is larger than the diameter of the through-hole in the second through-hole group.

[0020] Furthermore, the water inlet assembly includes a water inlet pipe and a plurality of water spray pipes connected to the water inlet pipe; the outlet of each of the water spray pipes is provided on the feed hopper; the feed hopper is also provided with a baffle at the outlet; water is sprayed from the outlet toward the inner wall of the feed hopper;

[0021] Furthermore, the feed hopper includes a first sliding plate and a second sliding plate, which are inclined upwards and downwards respectively. The bottom of the first sliding plate is connected to the top of the second sliding plate through a transition plate, and one side of the transition plate is bent and extends toward the upper surface of the second sliding plate to form the baffle. A gap is left between the bottom of the baffle and the upper surface of the second sliding plate for water to flow out. The bottom of the first sliding plate is connected to the baffle, and the second sliding plate is connected to the side of the transition plate where the baffle is not provided. The outlets of each of the water spray pipes are provided on the transition plate, and water is sprayed from the outlets toward the upper surface of the second sliding plate.

[0022] Preferably, three water spray pipes are connected to the transition plate;

[0023] Furthermore, the water pump is connected to the water inlet pipe;

[0024] Furthermore, the water pump is equipped with multiple water flow rate settings, and the operator can select different water flow rate settings according to the characteristics of different waste film materials (such as specific gravity, density, cleanliness, production capacity, etc.); N water flow rate settings can be preset, where N is a positive integer, and the water flow rate can be set to gradually decrease or increase from the first water flow rate setting to the Nth water flow rate setting.

[0025] Furthermore, the sorting tank is in the shape of an inverted trapezoid, and a support frame is provided at the bottom of the sorting tank;

[0026] The discharge port at the bottom of the sorting tank is connected to a horizontally arranged discharge pipe; the discharge pipe forms the discharge channel inside, and the electric rotary valve is located at the discharge port of the discharge pipe.

[0027] Furthermore, the discharge pipe is connected to the circulating water tank via an electric rotary valve, and the circulating water tank is connected to the inlet pipe; the circulating water tank filters the impurities and sewage discharged from the discharge port and then re-transports the treated water back to the inlet pipe for recycling.

[0028] Furthermore, the water level in the sorting tank exceeds 1 / 2 of the height of the sorting tank, and the water level is not higher than the bottom of the baffle.

[0029] Furthermore, the pre-crushing device has a pre-crushing chamber, which is provided with an arc-shaped pressure plate and a pre-crushing roller located below the arc-shaped pressure plate; the pre-crushing roller is provided with multiple moving blades, and the side wall of the pre-crushing chamber is also provided with multiple fixed blades, with a gap between two adjacent fixed blades for the moving blades to pass through;

[0030] Furthermore, multiple moving blades are spirally distributed on the pre-crushing roller;

[0031] The arc-shaped pressing plate is used to press down the waste film material, so that the waste film material can be fully crushed by the fixed knife and the moving knife on the pre-crushing roller; the arc-shaped pressing plate is also provided with an arc-shaped inclined surface to facilitate the sliding of the waste film material; a metal conveyor belt is also provided on one side of the pre-crushing device, which is used to convey the waste film material to the feed port.

[0032] A pretreatment method for membrane cleaning and recycling includes the following steps:

[0033] Step S1: First, preset the water level in the sorting tank, turn on the water sorting device, and the water spray pipe in the sorting tank starts spraying water. The heavy conveyor belt and the membrane conveyor belt also start working. When the level gauge detects that the water level is lower than the preset water level line, control the closing of the electric rotary valve and start the water pump to inject water to the preset water level line at the preset water flow rate. When the level gauge detects that the water level has reached the preset water level line, control the valve size of the electric rotary valve and the pumping frequency of the water pump to adjust the inlet and outlet water flow so that the water level is always maintained at the preset height.

[0034] Step S2: Turn on the belt conveyor, pre-crushing device and metal conveyor belt in sequence. Put the waste film material onto the metal conveyor belt. The metal conveyor belt feeds the waste film material into the pre-crushing device from the feed port. The waste film material slides down the inner wall of the pre-crushing device to the pre-crushing roller. At this time, the arc-shaped pressure plate presses down on the waste film material. The pre-crushing roller performs preliminary crushing treatment on the waste film material.

[0035] Step S3: The crushed waste film material falls onto the belt conveyor. At this time, the photoelectric switch on the belt conveyor detects the presence of waste film material and closes. The water pump adjusts the pumping frequency and controls the water flow rate in the sorting tank. Simultaneously, the electric rotary valve is adjusted to keep the water level in the sorting tank at a preset height. The belt conveyor transports the processed waste film material to the feed hopper of the water sorting device. When the level gauge detects that the water level exceeds the preset water level line, the alarm will sound an alarm signal, shut down the water pump, and stop feeding.

[0036] Step S4: Waste film material slides from the first sliding plate of the feed hopper to the second sliding plate of the feed hopper. Water from the water spray pipe sprays out from the outlet toward the upper surface of the second sliding plate. The flowing water carries the waste film material that has fallen on the second sliding plate toward the heavy conveyor belt. Under the impact of the water, the waste film material is separated into light materials and hard impurities. The heavy conveyor belt is used to transport hard impurities, while the film conveyor belt is used to transport light materials.

[0037] Step S5: When impurities accumulate in the discharge pipe at the bottom of the sorting water tank, adjust the water flow rate of the electric rotary valve and the water pump to make the fast-flowing water flush out the accumulated impurities and prevent the bottom of the discharge pipe from being blocked; the circulating water tank filters the impurities and sewage discharged from the discharge port and then sends the treated water back to the spray pipe for recycling.

[0038] Step S6: The heavy conveyor belt transports the hard impurities that have completed preliminary crushing and cleaning to the collection box; the thin film conveyor belt transports the light materials to the crusher for subsequent crushing operations.

[0039] The beneficial effects of this invention are:

[0040] (1) First, through the combined action of the pre-crushing device and the water separation device, hard impurities such as iron products and sand in the waste film material are effectively removed before crushing. This pretreatment process significantly reduces the number of hard impurities entering the crusher, thereby greatly reducing the wear rate of the crusher blades and extending the service life of the crusher cutter roller structure, motor reducer and other related equipment.

[0041] (2) The water separation device of the present invention can remove iron products and sand during the pre-cleaning process, so that the present invention can remove the iron separator on the original production line. Moreover, the pretreatment system of the present invention can effectively avoid crusher failures and downtime caused by hard impurities; reduce the maintenance and replacement work caused by equipment damage, thereby significantly improving the overall operating efficiency and production capacity of the production line.

[0042] (3) The pretreatment system of the present invention is equipped with an automatic control module, which can monitor and control the water level in the sorting tank in real time. Through the coordinated work of components such as level gauge, alarm, water pump and electric rotary valve, the system achieves automated operation and fault early warning. This not only improves the convenience of operation, but also ensures the safe and stable operation of the system. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the pretreatment system for thin-film cleaning and recycling according to the present invention;

[0044] Figure 2 This is a front view of a pretreatment system for thin-film cleaning and recycling according to the present invention;

[0045] Figure 3 This is a schematic diagram of the water separation device of the present invention;

[0046] Figure 4 This is a top view of the water separation device of the present invention;

[0047] Figure 5 This is a front view of the water separation device of the present invention;

[0048] Figure 6 This is a cross-sectional view of the water separation device of the present invention;

[0049] Figure 7 This is a schematic diagram of the water separation device of the present invention after the first sliding plate has been removed.

[0050] Figure 8 This is a schematic diagram of the pre-crushing device and the metal conveyor belt of the present invention;

[0051] Figure 9 This is a schematic diagram of the pre-crushing device of the present invention;

[0052] Figure 10 This is a cross-sectional view of the pre-crushing device of the present invention.

[0053] Marker explanation:

[0054] 1. Pre-crushing device; 11. Feed inlet; 12. Arc-shaped pressure plate; 13. Pre-crushing chamber; 14. Pre-crushing roller; 141. Moving knife; 15. Fixed knife; 2. Water separation device; 21. Separating water tank; 211. Discharge pipe; 22. Recycling box; 23. Heavy conveyor belt; 231. Arc-shaped strip; 24. Baffle; 25. Film conveyor belt; 251. Chain; 26. Feed hopper; 261. First sliding plate; 262. Second sliding plate; 263. Transition plate; 2631. Baffle; 27. Water inlet pipe; 271. Water spray pipe; 28. Electric rotary valve; 29. ​​Support frame; 3. Belt conveyor; 4. Metal conveyor belt. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0057] like Figure 1-9 As shown, this embodiment provides a pretreatment system for film cleaning and recycling. The pretreatment system pre-treats the waste film material before conveying it to a crusher for crushing.

[0058] The pretreatment system includes a pre-crushing device 1 for preliminary crushing of waste film material and a water separation device 2 for preliminary cleaning of waste film material; wherein, the pre-crushing device 1 is connected to the water separation device 2 via a belt conveyor 3; the top of the pre-crushing device 1 is provided with an inlet 11 for feeding waste film material; the belt conveyor 3 transports the waste film material processed by the pre-crushing device 1 to the water separation device 2;

[0059] The water separation device 2 includes a water separation tank 21 for holding water, and a heavy conveyor belt 23, a film conveyor belt 25, a water inlet assembly, and a drainage assembly disposed within the water separation tank 21. The water separation tank 21 is also provided with a feed hopper 26 for inputting waste film material. The feed hopper 26 is located above the heavy conveyor belt 23, and the water inlet assembly is located on the feed hopper 26. The bottom of the water separation tank 21 is provided with a discharge channel, and the drainage assembly is located on the discharge channel. When water is injected into the water separation tank 21, under the action of water buoyancy, the waste film material is separated into light materials and hard impurities. The light materials float to the top, while the hard impurities sink to the bottom of the water separation tank 21.

[0060] The heavy conveyor belt 23 is used to convey hard impurities, and the thin film conveyor belt 25 is used to convey light materials; the hard impurities include iron products and sand and gravel, and the light materials include thin films; the heavy conveyor belt 23 extends obliquely from the bottom of the sorting tank 21 to one side of the top of the sorting tank 21, and the thin film conveyor belt 25 extends obliquely from the other side of the top of the sorting tank 21 to above the heavy conveyor belt 23.

[0061] First, through the combined action of the pre-crushing device 1 and the water separation device 2, hard impurities such as iron products and sand in the waste film material are effectively removed before crushing. This pretreatment process significantly reduces the amount of hard impurities entering the crusher, thereby greatly reducing the wear rate of the crusher blades and extending the service life of the crusher roller structure, motor reducer and other related equipment.

[0062] Secondly, the pretreatment system in this embodiment can effectively avoid crusher failures and downtime caused by hard impurities; it reduces the maintenance and replacement work due to equipment damage, thereby significantly improving the overall operating efficiency and production capacity of the production line.

[0063] The water separation device 2 also includes an automatic control module for monitoring and controlling the water level in the separation tank 21. The automatic control module includes a main controller, a level gauge, and an alarm. The water inlet assembly includes a water pump, and the drainage assembly includes an electric rotary valve 28. The level gauge, alarm, water pump, and electric rotary valve 28 are electrically connected to the main controller. The level gauge is located inside the separation tank 21.

[0064] The pretreatment system in this embodiment is equipped with an automatic control module that can monitor and control the water level in the sorting tank 21 in real time. Through the coordinated operation of components such as the level gauge, alarm, water pump, and electric rotary valve 28, automated operation and fault warning of the system are achieved. This not only improves the ease of operation but also ensures the safe and stable operation of the system.

[0065] In practical applications, the water pump is turned on to inject water into the sorting tank 21, and then the pre-crushed waste film material to be sorted is placed into the sorting tank 21. Under the impact of the water, light materials are flushed to the top of the sorting tank 21, while hard impurities sink to the bottom. Through the separation of the film conveyor belt 25 and the heavy material conveyor belt 23, light materials and hard impurities are collected to different outlets.

[0066] Specifically, the length of the heavy conveyor belt 23 is greater than the length of the film conveyor belt 25, and the bottom of the film conveyor belt 25 is not connected to the heavy conveyor belt 23; the film conveyor belt 25 and the heavy conveyor belt 23 are arranged in a Y-shape inside the sorting tank 21.

[0067] It should be noted that the length of the heavy-duty conveyor belt 23 is greater than that of the film conveyor belt 25, allowing harder impurities more time and distance for screening and sorting on the conveyor belts. Furthermore, the bottom of the film conveyor belt 25 is not connected to the heavy-duty conveyor belt 23, avoiding mixing and interference between hard and light impurities during transport. This design ensures that hard impurities and light materials can be transported smoothly along their respective paths, reducing the risk of material blockage and transport failures. Simultaneously, because the two conveyor belts form a certain angle at the Y-shaped intersection, this design increases the dispersion and flowability of materials during transport, improving transport efficiency.

[0068] More specifically, the film conveyor belt 25 is a chain sprocket belt, and the film conveyor belt 25 includes multiple chains 251 arranged in sequence at equal intervals. The space between two adjacent chains 251 is hollowed out. The hollowed-out arrangement allows hard impurities stuck in the material to fall down and then be collected and discharged again through the discharge channel.

[0069] The heavy conveyor belt 23 is a rubber belt. On the side of the heavy conveyor belt 23 that contacts the waste film material, a plurality of arc-shaped strips 231 are uniformly protruded. Each arc-shaped strip 231 is conducive to increasing the friction between the heavy conveyor belt and the hard impurities, so that the hard impurities can be screened out smoothly.

[0070] Specifically, the belt conveyor 3 extends obliquely from the bottom of the pre-crushing device 1 to the feed hopper 26; the belt conveyor 3 includes a head end and an end end, the head end being located directly below the discharge port at the bottom of the pre-crushing device 1, and the end end being located directly above the feed hopper 26; a photoelectric switch is also provided at the end end, and the photoelectric switch is electrically connected to the water pump; when waste film material is placed on the belt conveyor 3, the photoelectric switch detects the presence of waste film material, the photoelectric switch closes, the water pump adjusts the pumping frequency, thereby controlling the water flow speed in the sorting water tank 21, and at the same time, the electric rotary valve 28 is adjusted to keep the water level in the sorting water tank 21 at a set position.

[0071] Specifically, the bottom of the heavy conveyor belt 23 is also provided with a baffle 24 to block hard impurities from sinking, and the surface of the baffle 24 is provided with multiple drainage holes.

[0072] More specifically, the bottom of the baffle 24 is provided with an extension plate that extends to the surface of the heavy conveyor belt 23. The extension plate is mainly used to prevent hard impurities from sinking to the bottom of the sorting tank 21, so that the hard impurities can be conveyed out by the heavy conveyor belt 23.

[0073] Specifically, the sorting water tank 21 has a recycling tank 22 on the side where the membrane conveyor belt 25 is located, and the side wall of the sorting water tank 21 has a plurality of through holes that communicate with the recycling tank 22; the bottom of the recycling tank 22 is connected to the circulating water tank.

[0074] More specifically, the sorting tank 21 has a first through hole group and a second through hole group on its side wall; along the direction of inclination of the side wall of the sorting tank 21, the first through hole group is located above the second through hole group; the diameter of the through hole in the first through hole group is larger than the diameter of the through hole in the second through hole group.

[0075] In this embodiment, the arrangement of the recycling tank 22, the first through-hole group, and the second through-hole group is beneficial for adjusting the water level in the sorting water tank 21 to prevent the water level in the sorting water tank 21 from being too high. When the water level is higher than the second through-hole group, the water will first flow into the recycling tank 22 from the second through-hole group. When the water level is higher than the first through-hole group, since the diameter of the first through-hole group is larger, it further promotes the water to flow to the recycling tank 22 more quickly, thereby preventing the water level from being too high.

[0076] Specifically, the water inlet assembly includes a water inlet pipe 27 and a plurality of water spray pipes 271 connected to the water inlet pipe 27; the outlet of each of the water spray pipes 271 is provided on the feed hopper 26; the feed hopper 26 is also provided with a baffle 2631 at the outlet; water is sprayed from the outlet toward the inner wall of the feed hopper 26;

[0077] More specifically, the feed hopper 26 includes a first sliding plate 261 and a second sliding plate 262, the first sliding plate 261 and the second sliding plate 262 being inclined upwards and downwards respectively; the bottom of the first sliding plate 261 is connected to the top of the second sliding plate 262 through a transition plate 263, and one side of the transition plate 263 is bent and extends toward the upper surface of the second sliding plate 262 to form the baffle 2631, and a gap for water to flow out is left between the bottom of the baffle 2631 and the upper surface of the second sliding plate 262; the bottom of the first sliding plate 261 is connected to the baffle 2631, and the second sliding plate 262 is connected to the side of the transition plate 263 where the baffle 2631 is not provided; the outlets of each of the water spray pipes 271 are all provided on the transition plate 263, and water is sprayed from the outlets toward the upper surface of the second sliding plate 262;

[0078] Preferably, three water spray pipes 271 are connected to the transition plate 263;

[0079] The baffle 2631 helps to prevent waste film material from clogging the water outlet;

[0080] Specifically, the water pump is connected to the water inlet pipe 27;

[0081] More specifically, the water pump is equipped with multiple water flow rate settings. The operator can select different water flow rate settings according to the characteristics of different waste film materials (such as specific gravity, density, cleanliness, production capacity, etc.). N water flow rate settings can be preset, where N is a positive integer, and the water flow rate can be set to gradually decrease or increase from the first water flow rate setting to the Nth water flow rate setting.

[0082] Specifically, the sorting water tank 21 is in the shape of an inverted trapezoid, and the bottom of the sorting water tank 21 is provided with a support frame 29; the inverted trapezoidal design makes the left and right side walls of the sorting water tank 21 inclined, which is conducive to concentrating water and hard impurities to the bottom.

[0083] The discharge port at the bottom of the sorting tank 21 is connected to a horizontally arranged discharge pipe 211; the discharge channel is formed inside the discharge pipe 211, and the electric rotary valve 28 is located at the discharge port of the discharge pipe 211.

[0084] More specifically, the discharge pipe 211 is connected to the circulating water tank via an electric rotary valve 28, and the circulating water tank is connected to the inlet pipe 27; the circulating water tank filters the impurities and sewage discharged from the discharge port and then re-transports the treated water back to the inlet pipe 27 for recycling.

[0085] A small amount of mud and sand may fall to the bottom of the sorting water tank 21. When the water is drained, the mud and sand will be carried away by the water flow. The drained water can be recycled after being treated by the circulating water tank. The water loss of the entire water sorting device 2 is low and does not produce air pollution, which meets the environmental protection requirements.

[0086] Specifically, the water level in the sorting tank 21 exceeds 1 / 2 of the height of the sorting tank 21, and the water level is not higher than the bottom of the baffle 2631, so as to ensure that the film conveyor belt 25 can convey light materials obliquely upward.

[0087] Specifically, the pre-crushing device 1 has a pre-crushing chamber 13, and the pre-crushing chamber 13 is provided with an arc-shaped pressure plate 12 and a pre-crushing roller 14 located below the arc-shaped pressure plate 12; the pre-crushing roller 14 is provided with a plurality of moving blades 141, and the side wall of the pre-crushing chamber 13 is also provided with a plurality of fixed blades 15, and a gap is left between two adjacent fixed blades 15 for the moving blades 141 to pass through;

[0088] More specifically, multiple moving blades 141 are spirally distributed on the pre-crushing roller 14;

[0089] It should be noted that the pre-crushing roller 14 is connected to the shaft of the drive motor. When the shaft rotates, the pre-crushing roller 14 drives the moving blade 141 to rotate with the shaft.

[0090] The arc-shaped pressure plate 12 is used to press down the waste film material so that the waste film material can be fully crushed by the fixed blade 15 and the moving blade 141 on the pre-crushing roller 14; the arc-shaped pressure plate 12 is also provided with an arc-shaped inclined surface to facilitate the sliding of the waste film material; a metal conveyor belt 4 is also provided on one side of the pre-crushing device 1, and the metal conveyor belt 4 is used to convey the waste film material to the feed port 11.

[0091] This embodiment also provides a pretreatment method for membrane cleaning and recycling, including the following steps:

[0092] Step S1: First, preset the water level in the sorting tank 21, turn on the water sorting device 2, and the water spray pipe 271 in the sorting tank 21 starts spraying water. The heavy conveyor belt 23 and the membrane conveyor belt 25 also start working. When the level gauge detects that the water level is lower than the preset water level line, control the closing of the electric rotary valve 28 and start the water pump to inject water to the preset water level line at the preset water flow rate. When the level gauge detects that the water level has reached the preset water level line, control the valve size of the electric rotary valve 28 and the pumping frequency of the water pump to adjust the inlet and outlet water volume so that the liquid level is always maintained at the preset height.

[0093] Step S2: Sequentially turn on the belt conveyor 3, the pre-crushing device 1, and the metal conveyor belt 4. Feed the waste film material onto the metal conveyor belt 4. The metal conveyor belt 4 feeds the waste film material into the pre-crushing device 1 from the feed inlet 11. The waste film material slides down the inner wall of the pre-crushing device 1 to the pre-crushing roller 14. At this time, the arc-shaped pressure plate 12 presses down on the waste film material, and the pre-crushing roller 14 performs preliminary crushing treatment on the waste film material.

[0094] Step S3: The crushed waste film material falls onto the belt of the belt conveyor 3. At this time, the photoelectric switch on the belt conveyor 3 detects the presence of waste film material and closes. The water pump adjusts the pumping frequency and controls the water flow speed in the sorting tank 21. At the same time, the electric rotary valve 28 is adjusted to keep the water level in the sorting tank 21 at a preset height. The belt conveyor 3 transports the processed waste film material to the feed hopper 26 of the water separation device 2. When the level gauge detects that the water level exceeds the preset water level line, the alarm will sound an alarm signal, shut down the water pump, and stop feeding.

[0095] Step S4: Waste film material slides from the first sliding plate 261 of the feed hopper 26 to the second sliding plate 262 of the feed hopper 26. Water from the water spray pipe 271 sprays out from the outlet toward the upper surface of the second sliding plate 262. The flowing water pushes the waste film material falling on the second sliding plate 262 toward the heavy conveyor belt 23. Under the impact of the water, the waste film material is separated into light materials and hard impurities. The heavy conveyor belt 23 is used to transport hard impurities, while the film conveyor belt 25 is used to transport light materials.

[0096] Step S5: When impurities accumulate at the bottom of the sorting water tank 21, adjust the water flow rate of the electric rotary valve 28 and the water pump to make the fast-flowing water flush out the accumulated impurities and prevent the bottom of the discharge pipe 211 from being blocked; the circulating water tank filters the impurities and sewage discharged from the outlet and then sends the treated water back to the spray pipe 271 for recycling.

[0097] Step S6: The heavy conveyor belt 23 transports the hard impurities that have completed preliminary crushing and cleaning to the collection box; the thin film conveyor belt 25 transports the light materials to the crusher for subsequent crushing operations.

[0098] It should be noted that the subsequent crushing operation is a further secondary crushing by the crusher. After the secondary crushing is completed, secondary cleaning, dehydration and drying, and collection will also be carried out.

[0099] More specifically, after the waste film material has completed the entire production line process, including initial crushing, initial washing, secondary crushing, secondary washing, dehydration and drying, and collection, the pretreatment system will sequentially shut down the metal conveyor belt 4, the pre-crushing device 1, the belt conveyor 3, and the water separation device 2.

[0100] Compared to existing recycling processes for waste film, the pretreatment method for film cleaning and recycling described in this embodiment does not require a separate iron remover to remove iron products from the waste film. Instead, the iron products and sand are removed during the pre-washing process using the water separation device 2. Removing more impurities during pre-washing helps solve problems such as the crusher's cutter roller easily breaking when encountering sand and gravel during crushing, high production line maintenance costs, serious environmental pollution, and low production efficiency.

[0101] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A pre-treatment system for thin film cleaning and recycling, which pre-treatment system is used for pre-treating waste and old film materials before the waste and old film materials are sent to a crusher for crushing operation, characterized in that: the pre-treatment system comprises a pre-crushing device for pre-crushing the waste and old film materials, and a water separation device for pre-cleaning the waste and old film materials; the pre-crushing device is connected with the water separation device through a belt conveyor; the top of the pre-crushing device is provided with a feeding port for feeding the waste and old film materials; the belt conveyor is used for conveying the waste and old film materials treated by the pre-crushing device to the water separation device; the water separation device comprises a separation water tank for containing water, and a heavy material conveying belt, a film conveying belt, a water inlet assembly and a water outlet assembly arranged in the separation water tank; the separation water tank is further provided with a feeding hopper for feeding the waste and old film materials, the feeding hopper is arranged above the heavy material conveying belt, and the water inlet assembly is arranged on the feeding hopper; the bottom of the separation water tank is provided with a discharging passage, and the water outlet assembly is arranged on the discharging passage; water is injected into the separation water tank, under the action of water buoyancy, the waste and old film materials are separated into light materials and hard impurities, the light materials float up, and the hard impurities sink to the bottom of the separation water tank; the heavy material conveying belt is used for conveying the hard impurities, and the film conveying belt is used for conveying the light materials; the heavy material conveying belt extends from the bottom of the separation water tank to one side of the top of the separation water tank in an inclined manner, and the film conveying belt extends from the other side of the top of the separation water tank to above the heavy material conveying belt in an inclined manner; the water separation device further comprises an automatic control module for monitoring and controlling the water level in the separation water tank, the automatic control module comprises a main controller, a liquid level meter and an alarm; the water inlet assembly comprises a water pump, and the water outlet assembly comprises an electric rotary valve; the liquid level meter, the alarm, the water pump and the electric rotary valve are electrically connected with the main controller respectively; the liquid level meter is arranged on the inner side of the separation water tank; the pre-crushing device is provided with a pre-crushing cavity, the pre-crushing cavity is provided with an arc-shaped pressing plate and a pre-crushing roller arranged below the arc-shaped pressing plate; the arc-shaped pressing plate is further provided with an arc-shaped inclined surface for facilitating the waste and old film materials to slide off; one side of the pre-crushing device is further provided with a metal conveying belt, and the metal conveying belt is used for conveying the waste and old film materials to the feeding port; the length of the heavy material conveying belt is greater than the length of the film conveying belt, and the bottom of the film conveying belt is not connected with the heavy material conveying belt; the film conveying belt and the heavy material conveying belt are arranged in a y-shaped manner in the separation water tank; the film conveying belt is a chain and sprocket belt, and the film conveying belt comprises a plurality of chains arranged in equal intervals in sequence, adjacent two chains are arranged in a hollow manner; the heavy material conveying belt is a rubber belt, and a plurality of arc-shaped strips are uniformly protruded on one side of the heavy material conveying belt which contacts the waste and old film materials; the belt conveyor extends from the bottom of the pre-crushing device to the feeding hopper in an inclined manner; the belt conveyor comprises a first end and a last end, the first end is arranged directly below the discharging port at the bottom of the pre-crushing device, and the last end is arranged directly above the feeding hopper; an optical switch is further arranged at the last end, and the optical switch is electrically connected with the water pump. ​ ​ ​ ​ ​ 2. The pre-treatment system for thin film cleaning and recovery of claim 1, wherein, ​ 3. The pre-treatment system for thin film cleaning and recovery of claim 1, wherein, ​ ​ 4. The pre-treatment system for thin film cleaning and recovery of claim 1, wherein, ​ 5. The pre-treatment system for thin film cleaning and recovery of claim 1, wherein, The bottom of the heavy object conveying belt is also provided with a baffle for preventing hard impurities from sinking, and the surface of the baffle is provided with a plurality of drainage holes. The sorting water tank is provided with a recycling tank on the side where the film conveying belt is located, and a plurality of through holes are formed in the side wall of the sorting water tank and communicated with the recycling tank; the bottom of the recycling tank is connected with the circulating water tank.

6. The pre-treatment system for thin film cleaning and recovery of claim 1, wherein, The water inlet assembly comprises a water inlet pipe and a plurality of water spraying pipes communicated with the water inlet pipe; the water outlet of each water spraying pipe is arranged on the feed hopper; the feed hopper is also provided with a shutter at the water outlet; water is sprayed from the water outlet towards the inner side wall of the feed hopper; the water pump is communicated with the water inlet pipe.

7. A pre-treatment system for thin film cleaning and recovery according to claim 6, wherein The water level line in the sorting water tank is higher than 1 / 2 of the height of the sorting water tank, and the water level line does not exceed the bottom of the shutter.

8. The pre-treatment system for thin film cleaning and recovery of claim 1, wherein, The sorting water tank is in the shape of an inverted trapezoid, and the bottom of the sorting water tank is provided with a support frame. The discharge port of the bottom of the sorting water tank is communicated with a transversely arranged discharge pipe; the discharge pipe forms the discharge channel inside, and the electric rotary valve is arranged on the discharge port of the discharge pipe.

9. A method for pre-treating thin film cleaning and recovery, characterized by, The method is applied to the film cleaning and recycling pretreatment system of any one of claims 1 to 8, and comprises the following steps: Step S1: first, preset the water level height in the sorting water tank, start the water sorting device, and the water spraying pipes in the sorting water tank start spraying water; the heavy object conveying belt and the film conveying belt also start working; when the liquid level meter detects that the water level is lower than the preset water level line, control the electric rotary valve to be closed and the water pump to be started, and inject water to the preset water level line at a preset water flow rate; when the liquid level meter detects that the water level reaches the preset water level line, control the valve size of the electric rotary valve and the water pumping frequency of the water pump, and adjust the water inflow and outflow to keep the liquid level at the preset height; Step S2: sequentially start the belt conveyor, the pre-crushing device and the metal conveying belt, put the waste and old film materials on the metal conveying belt, and the metal conveying belt puts the waste and old film materials into the pre-crushing device from the feed port; the waste and old film materials slide along the inner side wall of the pre-crushing device to the pre-crushing roller, at this time, the arc-shaped pressing plate presses the waste and old film materials, and the pre-crushing roller preliminarily crushes the waste and old film materials; Step S3: the waste and old film materials after the crushing treatment fall on the belt of the belt conveyor, at this time, the photoelectric switch on the belt conveyor detects the waste and old film materials, the photoelectric switch is closed, the water pumping frequency of the water pump is adjusted, the water flow rate in the sorting water tank is controlled, and the water level in the sorting water tank is kept at the preset height by adjusting the electric rotary valve; the belt conveyor conveys the treated waste and old film materials to the feed hopper of the water sorting device; when the liquid level meter detects that the water level exceeds the preset water level line, the alarm will send an alarm signal, and the water pump is turned off and the feeding is stopped. Step S4: the waste and old film material falls from the first sliding plate of the feeding hopper to the second sliding plate of the feeding hopper, the water body at the water spraying pipe sprays from the water outlet towards the upper surface of the second sliding plate, and the flowing water body drives the waste and old film material falling on the second sliding plate to the heavy object conveying belt; under the impact of the water, the waste and old film material is divided into light substance and hard impurities, the heavy object conveying belt is used to convey the hard impurities, and the film conveying belt is used to convey the light substance; Step S5: when the impurities accumulate in the discharge pipe at the bottom of the sorting water tank, the water flow rate of the electric rotating valve and the water pump is adjusted so that the rapidly flowing water body drives the accumulated impurities to flow out, preventing the bottom of the discharge pipe from being blocked; the impurities and sewage discharged from the discharge port of the circulating water tank are filtered and treated, and the treated water body is re-delivered to the water spraying pipe for recycling; Step S6: the heavy object conveying belt delivers the hard impurities which have completed the preliminary crushing and preliminary cleaning to the collecting box; and the film conveying belt conveys the light substance to the crusher for subsequent crushing operation.

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