Pretreatment system and method for cleaning and recycling thin film

Abstract

The invention discloses a pretreatment system and method for film cleaning and recycling, and belongs to the technical field of environmental protection equipment. The pretreatment system comprises a pre-crushing device for performing preliminary crushing treatment on the waste thin film materials and a water separation device for performing preliminary cleaning treatment on the waste thin film materials; the pre-crushing device is connected with the water separation device through a belt conveyor; the water separation device comprises a separation water tank used for containing water, and a weight conveying belt, a film conveying belt, a water inlet assembly and a water drainage assembly which are arranged in the separation water tank. Water is injected into the sorting water tank, and materials are divided into light substances and hard impurities under the impact action of the water; the weight conveyor belt is used for conveying hard impurities; the film conveyor belt is used for conveying light substances; the water separation device further comprises an automatic control module used for monitoring and controlling the water level in the separation water tank. Hard impurities such as iron products and gravels are effectively removed before crushing, so that the wear rate of a cutter of the crusher is greatly reduced, and the service life of the cutter roller structure is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental protection equipment, and in particular relates to a pretreatment system and method for film cleaning and recycling. Background Art

[0002] As an inevitable product of urban metabolism, urban garbage has a complex and diverse composition, specifically covering three major categories: industrial garbage, construction garbage and domestic garbage. With the accelerated advancement of urbanization, the rapid development of new projects, large-scale renovation and demolition of old urban areas, and frequent renovation and reconstruction of roads are all accompanied by the generation of a large amount of construction garbage. At the same time, the vigorous development of the industrial field has also led to a sharp increase in the amount of industrial garbage, including harmful and difficult-to-degrade substances. It is worth noting that whether it is domestic garbage, industrial garbage or construction garbage, it contains a large amount of waste film, which comes in various forms, such as plastic bags, packaging films, woven bags commonly seen in daily life, and agricultural films widely used in agricultural production. These waste films are light in material and easy to scatter. If they are not properly handled, they will not only pollute the environment, but also seriously hinder the effective recycling of resources.

[0003] Currently, the recycling process for waste film on the market generally includes crushing, cleaning, dehydration and granulation. For example, in the prior art, the Chinese patent with publication number CN102179883B discloses a film crushing and cleaning line, which includes a conveyor belt arranged in sequence according to the process, a crusher for crushing the film conveyed by the conveyor belt, a scrubbing machine for cleaning the film and separating the film from the impurities on the film, a washing and rinsing machine for completely separating the film from the impurities on the film, a dehydrator for dehydrating the washed film, a drying system for further drying the dehydrated film, and a cyclone silo for bagging.

[0004] Although the above-mentioned existing technologies can free people from the harsh production environment of manual cleaning and realize production automation, the waste film is directly transported to the crusher for crushing without pretreatment. The mixed iron products, sand and other hard impurities will seriously wear or even directly break the crusher's cutter. Long-term operation will destroy the crusher's knife roller structure and even damage the motor reducer, etc., increasing the production line maintenance cost. Moreover, if the cleaning and crushing are not sufficient, it will affect the subsequent sorting and granulation work efficiency. 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, there are also air separators on the market to sort out films, but the dust and noise generated during the air separation process will have a serious impact on the surrounding environment and residents' lives.

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

[0006] In view of the problems in the related technology, the present invention proposes a pretreatment system and method for film cleaning and recycling to overcome the above-mentioned technical problems existing in the existing related technology. The present invention arranges a pre-crushing device and a water sorting device, so that hard impurities such as iron products, sand and stone in the waste film materials can be effectively removed before crushing, thereby greatly reducing the wear rate of the crusher tool and extending the service life of the crusher knife 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 and then transmits it to a crusher for crushing;

[0008] The pretreatment system includes a pre-crushing device for preliminarily crushing the waste film materials, and a water sorting device for preliminarily cleaning the waste film materials; wherein the pre-crushing device is connected to the water sorting device through a belt conveyor; a feed port for feeding the waste film materials is provided on the top of the pre-crushing device; the belt conveyor transports the waste film materials processed by the pre-crushing device to the water sorting device;

[0009] The water sorting device comprises a sorting water tank for holding water, and a weight conveyor belt, a film conveyor belt, a water inlet assembly and a water discharge assembly arranged in the sorting water tank; the sorting water tank is also provided with a feed hopper for inputting waste film materials, the feed hopper is arranged above the weight conveyor belt, and the water inlet assembly is arranged on the feed hopper; a discharge channel is arranged at the bottom of the sorting water tank, and the water discharge assembly is arranged on the discharge channel; water is injected into the sorting water tank, and under the action of water buoyancy, the waste 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 sorting water tank;

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

[0011] The water sorting device also includes an automatic control module for monitoring and controlling the water level in the sorting water tank, and the automatic control module includes a main controller, a liquid level meter and an alarm; the water inlet component includes a water pump, and the water discharge component includes an electric rotary valve; the liquid level meter, the alarm, the water pump, and the electric rotary valve are electrically connected to the main controller respectively; the liquid level meter is arranged on the inner side of the sorting water tank.

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

[0013] Furthermore, the film conveyor belt is a chain sprocket belt, and the film conveyor belt comprises a plurality of chains arranged in sequence at equal intervals, and a hollow space is formed between two adjacent chains;

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

[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 a tail end, the head end is placed directly below the discharge port at the bottom of the pre-crushing device, and the tail end is placed directly above the feed hopper; a photoelectric switch is also provided at the tail end, and the photoelectric switch is electrically connected to a water pump; when waste film materials are placed on the belt conveyor, the photoelectric switch detects the presence of waste film materials, the photoelectric switch is closed, and the water pump adjusts the pumping frequency to control the water flow rate in the sorting water tank, and at the same time, the electric rotary valve is adjusted to keep the water level in the sorting water tank at the set position.

[0016] Furthermore, a baffle is provided at the bottom of the heavy object conveyor belt to prevent hard impurities from sinking, and a plurality of drainage holes are provided on the surface of the baffle;

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

[0018] Furthermore, the water separation tank is provided with a recovery tank on the side where the film conveyor belt is located, and a plurality of through holes connected to the recovery tank are opened on the side wall of the water separation tank; the bottom of the recovery 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 inclination direction of the side wall of the sorting water tank, the first through hole group is arranged above the second through hole group; and the diameter of the through holes in the first through hole group is larger than the diameter of the through holes 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 water outlets of the water spray pipes are arranged on the feed hopper; the feed hopper is also provided with a shield at the water outlet; water is sprayed from the water outlet toward the inner wall of the feed hopper;

[0021] Furthermore, the feed hopper includes a first slide plate and a second slide plate, the first slide plate and the second slide plate are arranged to be inclined upward and downward; the bottom of the first slide plate is connected to the top of the second slide plate through a transition plate, and one side of the transition plate is bent and extends toward the upper surface of the second slide plate to form the shield plate, and a gap for water to flow out is left between the bottom of the shield plate and the upper surface of the second slide plate; the bottom of the first slide plate is connected to the shield plate, and the second slide plate is connected to the side of the transition plate where the shield plate is not set; the water outlets of each of the water spray pipes are arranged on the transition plate, and the water is sprayed from the water outlet toward the upper surface of the second slide plate;

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

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

[0024] Furthermore, the water pump is provided with a plurality of water flow rate gears, and the operator can select different water flow rate gears according to the characteristics of different waste film materials (such as specific gravity, density, cleanliness, production capacity, etc.); N water flow rate gears can be pre-set, where N is a positive integer, and the water flow rate from the first water flow rate gear to the Nth water flow rate gear can be set to gradually weaken or speed up.

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

[0026] The discharge port at the bottom of the sorting water tank is connected to a discharging pipe arranged transversely; the interior of the discharging pipe forms the discharging channel, and the electric rotary valve is arranged on the discharging port of the discharging pipe;

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

[0028] Furthermore, the water level in the sorting water tank exceeds 1 / 2 of the height of the sorting water 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, in which an arc-shaped material pressing plate and a pre-crushing roller arranged below the arc-shaped material pressing plate are arranged; the pre-crushing roller is provided with a plurality of movable knives, and the side wall in the pre-crushing chamber is also provided with a plurality of fixed knives, and a gap is left between two adjacent fixed knives for the movable knives to pass through;

[0030] Furthermore, a plurality of movable knives are distributed in a spiral shape on the pre-crushing roller;

[0031] The arc-shaped pressing plate is used to press down the waste film materials so that the waste film materials can be fully and initially crushed by the fixed knife and the movable knife on the pre-crushing roller; the arc-shaped pressing plate is also provided with an arc-shaped inclined surface for facilitating the waste film materials to slide down; a metal conveyor belt is also provided on one side of the pre-crushing device, and the metal conveyor belt is used to transport the waste film materials to the feed port.

[0032] A pretreatment method for film cleaning and recovery comprises the following steps:

[0033] Step S1: first preset the water level height in the sorting water tank, turn on the water sorting device, the water spray pipe in the sorting water tank starts to spray water, and the heavy object conveyor belt and the film conveyor belt also start to work; when the liquid level meter detects that the water level is lower than the preset water level line, control to close the electric rotary valve and start the water pump, and inject water to the preset water level line according to the 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 pumping frequency of the water pump, and adjust the water inlet and outlet to keep the liquid level at the preset height;

[0034] Step S2: Turn on the belt conveyor, the pre-crushing device and the metal conveyor belt in sequence, put the waste film materials onto the metal conveyor belt, and the metal conveyor belt puts the waste film materials into the pre-crushing device from the feed inlet; the waste film materials slide along the inner wall of the pre-crushing device to the pre-crushing roller, at which time the arc-shaped pressing plate presses down the waste film materials, and the pre-crushing roller performs preliminary crushing on the waste film materials;

[0035] Step S3: the waste film material after the crushing process falls onto the belt of the belt conveyor. At this time, the photoelectric switch on the belt conveyor detects the presence of waste film material, the photoelectric switch is closed, the water pump adjusts the pumping frequency and controls the water flow rate in the sorting water tank, and at the same time adjusts the electric rotary valve to keep the water level in the sorting water 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 liquid level meter detects that the water level exceeds the preset water level line, the alarm will send out an alarm signal, turn off the water pump and stop feeding;

[0036] Step S4: the waste film material slides from the first sliding plate of the feed hopper to the second sliding plate of the feed hopper, and the water at the water spray pipe is sprayed from the water outlet toward the upper surface of the second sliding plate, and the flowing water rushes the waste film material falling on the second sliding plate to the heavy object conveyor belt; under the impact of water, the waste film material is separated into light materials and hard impurities, the heavy object conveyor belt is used to convey the hard impurities, and the film conveyor belt is used to convey the 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 so that the fast-flowing water can flush out the accumulated impurities to 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 re-transports the treated water to the water spray pipe for recycling;

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

[0039] Beneficial effects of the present invention:

[0040] (1) First, through the combined action of the pre-crushing device and the water sorting device, hard impurities such as iron products, sand and stone in the waste film materials 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's knives and extending the service life of the crusher's knife roller structure, motor reducer and other related equipment.

[0041] (2) The water sorting device of the present invention can remove iron products and sand and gravel during the pre-cleaning process, so that the present invention can remove the iron remover on the original production line. Moreover, the pretreatment system of the present invention can effectively avoid crusher failure and shutdown events caused by hard impurities; reduce the maintenance and replacement work due to equipment damage, thereby significantly improving the overall operation 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 water tank in real time. Through the coordinated work of components such as the level meter, alarm, water pump and electric rotary valve, the automatic operation and fault warning of the system are realized. This not only improves the convenience of operation, but also ensures the safe and stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of a pretreatment system for film cleaning and recycling of the present invention;

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

[0045] Figure 3 It is a structural schematic diagram of the water sorting device of the present invention;

[0046] Figure 4 A top view of the water sorting device of the present invention;

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

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

[0049] Figure 7 This is a schematic diagram of the structure of the water sorting device of the present invention after the first sliding plate is removed;

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

[0051] Fig. 9 It is a structural schematic diagram of the pre-crushing device of the present invention;

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

[0053] Marking Description:

[0054] 1. Pre-crushing device; 11. Feeding port; 12. Arc-shaped pressing plate; 13. Pre-crushing chamber; 14. Pre-crushing roller; 141. Moving knife; 15. Fixed knife; 2. Water sorting device; 21. Sorting water tank; 211. Discharging pipe; 212. First through hole group; 213. Second through hole group; 22. Recovery box; 23. Heavy object conveyor belt; 231. Arc-shaped bar; 24. Baffle; 241. Drain hole; 25. Film conveyor belt; 251. Chain; 26. Feed hopper; 261. First sliding plate; 262. Second sliding plate; 263. Transition plate; 2631. Shield; 27. Water inlet pipe; 271. Water spray pipe; 28. Electric rotary valve; 29. ​​Support frame; 3. Belt conveyor; 4. Metal conveyor belt. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] like Figure 1-9 As shown, this embodiment provides a pretreatment system for film cleaning and recycling, wherein the pretreatment system pretreats the waste film material and then transmits it to a crusher for crushing;

[0058] The pretreatment system comprises a pre-crushing device 1 for preliminarily crushing the waste film materials, and a water sorting device 2 for preliminarily cleaning the waste film materials; wherein the pre-crushing device 1 is connected to the water sorting device 2 via a belt conveyor 3; a feed port 11 for feeding the waste film materials is provided on the top of the pre-crushing device 1; the belt conveyor 3 transports the waste film materials processed by the pre-crushing device 1 to the water sorting device 2;

[0059] The water sorting device 2 comprises a sorting water tank 21 for holding water, and a weight conveyor belt 23, a film conveyor belt 25, a water inlet assembly and a water discharge assembly arranged in the sorting water tank 21; the sorting water tank 21 is also provided with a feed hopper 26 for inputting waste film materials, the feed hopper 26 is arranged above the weight conveyor belt 23, and the water inlet assembly is arranged on the feed hopper 26; the bottom of the sorting water tank 21 is provided with a discharge channel, and the water discharge assembly is arranged on the discharge channel; water is injected into the sorting water tank 21, and under the action of water buoyancy, the waste 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 sorting water tank 21;

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

[0061] First, through the combined action of the pre-crushing device 1 and the water sorting device 2, hard impurities such as iron products, sand and stone in the waste film materials 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's knives and extending the service life of the crusher's knife roller structure, motor reducer and other related equipment;

[0062] Secondly, the pretreatment system of this embodiment can effectively avoid crusher failure and downtime caused by hard impurities; reduce 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 sorting device 2 also includes an automatic control module for monitoring and controlling the water level in the sorting water tank 21, and the automatic control module includes a main controller, a liquid level meter and an alarm; the water inlet component includes a water pump, and the water discharge component includes an electric rotary valve 28; the liquid level meter, the alarm, the water pump, and the electric rotary valve 28 are electrically connected to the main controller respectively; the liquid level meter is arranged inside the sorting water tank 21;

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

[0065] In actual application, the water pump is turned on to inject water into the sorting water tank 21, and then the pre-crushed waste film materials to be sorted are placed in the sorting water tank 21; under the impact of water, light materials are washed to the top of the sorting water tank 21, and hard impurities sink to the bottom. Through the separation of the film conveyor belt 25 and the heavy object conveyor belt 23, light materials and hard impurities are collected at different outlets.

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

[0067] It should be noted that the length of the heavy object conveyor belt 23 is greater than that of the film conveyor belt 25, so that hard impurities have more time and distance to be screened and classified on the conveyor belt. Moreover, the bottom of the film conveyor belt 25 is not connected to the heavy object conveyor belt 23, which avoids the mixing and mutual interference of hard impurities and light impurities during the transmission process. This design ensures that hard impurities and light materials can be smoothly transmitted along their respective paths, reducing the risk of material blockage and transmission failure. At the same time, since the two conveyor belts form a certain angle at the Y-shaped intersection, this design increases the dispersion and fluidity of the material during the transmission process, and improves the transmission efficiency.

[0068] More specifically, the film conveyor belt 25 is a chain sprocket belt, and the film conveyor belt 25 includes a plurality of chains 251 arranged in sequence at equal intervals, and a hollow setting is formed between two adjacent chains 251. The hollow setting allows hard impurities stuck in the material to fall down, and then be collected and discharged again through the discharge channel;

[0069] The heavy object conveyor belt 23 is a rubber belt, and a plurality of arc strips 231 are evenly protruded on the side of the heavy object conveyor belt 23 in contact with the waste film material. Each of the arc strips 231 is conducive to increasing the friction between the heavy object conveyor belt 23 and the hard impurities, so that the hard impurities can be smoothly screened out.

[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 a tail end, the head end is placed directly below the discharge port at the bottom of the pre-crushing device 1, and the tail end is placed directly above the feed hopper 26; a photoelectric switch is also provided at the tail end, and the photoelectric switch is electrically connected to a water pump; when waste film materials are placed on the belt conveyor 3, the photoelectric switch detects the presence of waste film materials, the photoelectric switch is closed, and the water pump adjusts the pumping frequency to control the water flow rate 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 the set position.

[0071] Specifically, a baffle 24 is provided at the bottom of the heavy object conveyor belt 23 to prevent hard impurities from sinking, and a plurality of drainage holes 241 are provided on the surface of the baffle 24;

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

[0073] Specifically, the separation water tank 21 is provided with a recovery tank 22 on the side where the film conveyor belt 25 is located, and a plurality of through holes connected to the recovery tank 22 are opened on the side wall of the separation water tank 21; the bottom of the recovery tank 22 is connected to the circulating water tank;

[0074] More specifically, a first through hole group 212 and a second through hole group 213 are provided on the side wall of the sorting water tank 21; along the inclination direction of the side wall of the sorting water tank 21, the first through hole group 212 is provided above the second through hole group 213; the through hole diameter in the first through hole group 212 is larger than the through hole diameter in the second through hole group 213;

[0075] In this embodiment, the arrangement of the recovery box 22, the first through hole group 212 and the second through hole group 213 is conducive to 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 213, water will first flow into the recovery box 22 from the second through hole group 213. When the water level is higher than the first through hole group 212, due to the larger diameter of the first through hole group 212, the water is further promoted to flow to the recovery box 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 water outlets of the water spray pipes 271 are arranged on the feed hopper 26; the feed hopper 26 is also provided with a shield plate 2631 at the water outlet; the water is sprayed from the water outlet toward the inner wall of the feed hopper 26;

[0077] More specifically, the feed hopper 26 includes a first slide plate 261 and a second slide plate 262, the first slide plate 261 and the second slide plate 262 are arranged to be inclined upward and downward; the bottom of the first slide plate 261 is connected to the top of the second slide 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 slide plate 262 to form the shield plate 2631, and a gap is left between the bottom of the shield plate 2631 and the upper surface of the second slide plate 262 for water to flow out; the bottom of the first slide plate 261 is connected to the shield plate 2631, and the second slide plate 262 is connected to the side of the transition plate 263 where the shield plate 2631 is not set; the water outlets of each of the water spray pipes 271 are set on the transition plate 263, and the water is sprayed from the water outlet toward the upper surface of the second slide plate 262;

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

[0079] The shield 2631 helps prevent the waste film material from blocking the water outlet;

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

[0081] More specifically, the water pump is provided with a plurality of water flow rate gears, and the operator can select different water flow rate gears according to the characteristics of different waste film materials (such as specific gravity, density, cleanliness, production capacity, etc.); N water flow rate gears can be pre-set, where N is a positive integer, and the water flow rate from the first water flow rate gear to the Nth water flow rate gear can be set to gradually weaken or speed up.

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

[0083] The discharge port at the bottom of the separation water tank 21 is connected to a discharging pipe 211 arranged transversely; the interior of the discharging pipe 211 forms the discharging channel, and the electric rotary valve 28 is arranged on the discharging port of the discharging pipe 211;

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

[0085] A small amount of sediment may fall to the bottom of the sorting water tank 21. When draining, the sediment will be carried away with the water flow. The drained water can be recycled after being treated in the circulating water tank. The water loss of the entire water sorting device 2 is low, no air pollution is generated, and it meets environmental protection requirements.

[0086] Specifically, the water level in the sorting water tank 21 exceeds 1 / 2 of the height of the sorting water tank 21, and the water level is not higher than the bottom of the shield plate 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, in which an arc-shaped pressing plate 12 and a pre-crushing roller 14 arranged below the arc-shaped pressing plate 12 are arranged; the pre-crushing roller 14 is provided with a plurality of moving knives 141, and the side wall of the pre-crushing chamber 13 is also provided with a plurality of fixed knives 15, and a gap is left between two adjacent fixed knives 15 for the moving knives 141 to pass through;

[0088] More specifically, a plurality of movable knives 141 are distributed in a spiral shape on the pre-crushing roller 14;

[0089] It should be noted that the pre-crushing roller 14 is in driving connection with the rotating shaft of the driving motor. When the rotating shaft rotates, the pre-crushing roller 14 drives the movable knife 141 to rotate along with the rotating shaft.

[0090] The arc-shaped pressing plate 12 is used to press down the waste film material so that the waste film material can be fully and initially crushed by the fixed knife 15 and the movable knife 141 on the pre-crushing roller 14; the arc-shaped pressing plate 12 is also provided with an arc-shaped inclined surface for facilitating the waste film material to slide down; 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 transport the waste film material to the feed port 11.

[0091] This embodiment also provides a pretreatment method for film cleaning and recovery, comprising the following steps:

[0092] Step S1: firstly preset the water level height in the sorting water tank 21, turn on the water sorting device 2, the water spray pipe 271 in the sorting water tank 21 starts to spray water, and the weight conveyor belt 23 and the film conveyor belt 25 also start to work; when the liquid level meter detects that the water level is lower than the preset water level line, control to close the electric rotary valve 28 and start the water pump, and inject water to the preset water level line according to the 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 28 and the pumping frequency of the water pump, and adjust the water inlet and outlet to keep the liquid level at the preset height;

[0093] Step S2: sequentially start the belt conveyor 3, the pre-crushing device 1 and the metal conveyor belt 4, put the waste film materials onto the metal conveyor belt 4, and the metal conveyor belt 4 puts the waste film materials into the pre-crushing device 1 from the feed inlet 11; the waste film materials slide along the inner wall of the pre-crushing device 1 to the pre-crushing roller 14, at which time the arc-shaped pressing plate 12 presses down the waste film materials, and the pre-crushing roller 14 performs preliminary crushing on the waste film materials;

[0094] Step S3: the waste film material after the crushing process 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, the photoelectric switch is closed, the water pump adjusts the pumping frequency and controls the water flow rate in the sorting water tank 21, and at the same time adjusts the electric rotary valve 28 to keep the water level in the sorting water tank 21 at a preset height; the belt conveyor 3 transports the processed waste film material to the feed hopper 26 of the water sorting device 2; when the liquid level meter detects that the water level exceeds the preset water level line, the alarm will send out an alarm signal, turn off the water pump and stop feeding;

[0095] Step S4: the waste film material slides from the first slide plate 261 of the feed hopper 26 to the second slide plate 262 of the feed hopper 26, and the water at the water spray pipe 271 is sprayed from the water outlet toward the upper surface of the second slide plate 262, and the flowing water rushes the waste film material falling on the second slide plate 262 to the heavy object conveyor belt 23; under the impact of water, the waste film material is separated into light materials and hard impurities, the heavy object conveyor belt 23 is used to convey the hard impurities, and the film conveyor belt 25 is used to convey the light materials;

[0096] Step S5: When impurities are accumulated in the discharge pipe 211 at the bottom of the sorting water tank 21, the water flow rate of the electric rotary valve 28 and the water pump is adjusted so that the fast-flowing water body can flush out the accumulated impurities to prevent the bottom of the discharge pipe 211 from being blocked; the circulating water tank filters the impurities and sewage discharged from the discharge port, and then re-transports the treated water body to the water spray pipe 271 for recycling;

[0097] Step S6: The heavy object conveyor belt 23 transports the hard impurities that have been initially crushed and cleaned to a collection box; the film conveyor belt 25 transports the light objects to a crusher for subsequent crushing operations.

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

[0099] More specifically, when the waste film materials have completed the entire production line process including primary crushing, primary cleaning, secondary crushing, secondary cleaning, dehydration and drying, and collection, the pretreatment system will shut down the metal conveyor belt 4, the pre-crushing device 1, the belt conveyor 3 and the water sorting device 2 in sequence.

[0100] Compared with the existing recycling process for waste film, the pretreatment method for film cleaning and recycling described in this embodiment does not need to set up an iron remover to remove iron products on the waste film, but can remove iron products and sand and gravel during the pre-cleaning process through the water sorting device 2. Removing more impurities during pre-washing is conducive to solving the problems of easy chipping of the crusher roller when encountering sand and gravel during crushing, high maintenance cost of the production line, serious environmental pollution and low production efficiency.

[0101] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also 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 scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A pretreatment system for film cleaning and recycling, wherein the pretreatment system pre-treats the waste film material and then transfers it to a crusher for crushing, characterized in that: The pretreatment system includes a pre-crushing device for preliminarily crushing the waste film materials, and a water sorting device for preliminarily cleaning the waste film materials; wherein the pre-crushing device is connected to the water sorting device through a belt conveyor; a feed port for feeding the waste film materials is provided on the top of the pre-crushing device; the belt conveyor transports the waste film materials processed by the pre-crushing device to the water sorting device; The water sorting device comprises a sorting water tank for holding water, and a weight conveyor belt, a film conveyor belt, a water inlet assembly and a water discharge assembly arranged in the sorting water tank; the sorting water tank is also provided with a feed hopper for inputting waste film materials, the feed hopper is arranged above the weight conveyor belt, and the water inlet assembly is arranged on the feed hopper; a discharge channel is arranged at the bottom of the sorting water tank, and the water discharge assembly is arranged on the discharge channel; water is injected into the sorting water tank, and under the action of water buoyancy, the waste 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 sorting water tank; The heavy object conveyor belt is used to convey hard impurities, and the film conveyor belt is used to convey light materials; the heavy object conveyor belt extends obliquely from the bottom of the sorting water tank to one side of the top of the sorting water tank, and the film conveyor belt extends obliquely from the other side of the top of the sorting water tank to the top of the heavy object conveyor belt; The water sorting device also includes an automatic control module for monitoring and controlling the water level in the sorting water tank, and the automatic control module includes a main controller, a liquid level meter and an alarm; the water inlet component includes a water pump, and the water discharge component includes an electric rotary valve; the liquid level meter, the alarm, the water pump, and the electric rotary valve are electrically connected to the main controller respectively; the liquid level meter is arranged on the inner side of the sorting water tank.

2. A pretreatment system for film cleaning and recovery according to claim 1, characterized in that: The length of the heavy object conveyor belt is greater than that of the film conveyor belt, and the bottom of the film conveyor belt is not connected to the heavy object conveyor belt; the film conveyor belt and the heavy object conveyor belt are arranged in a Y shape in the sorting water tank.

3. A pretreatment system for film cleaning and recovery according to claim 1, characterized in that: The film conveyor belt is a chain sprocket belt, and the film conveyor belt includes a plurality of chains arranged in sequence at equal intervals, and a hollow space is formed between two adjacent chains; The heavy object conveyor belt is a rubber belt, and a plurality of arc-shaped strips are evenly protruded on a side of the heavy object conveyor belt that contacts with the waste film materials.

4. A pretreatment system for film cleaning and recovery according to claim 1, characterized in that: 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 a tail end, the head end is placed directly below the discharge port at the bottom of the pre-crushing device, and the tail end is placed directly above the feed hopper; a photoelectric switch is also provided at the tail end, and the photoelectric switch is electrically connected to the water pump.

5. A pretreatment system for film cleaning and recovery according to claim 1, characterized in that: The bottom of the heavy object conveyor belt is also provided with a baffle plate to prevent hard impurities from sinking, and the surface of the baffle plate is provided with a plurality of drainage holes; The sorting water tank is provided with a recovery box on one side where the film conveyor belt is located, and a plurality of through holes communicating with the recovery box are opened on the side wall of the sorting water tank; the bottom of the recovery box is connected to the circulating water tank.

6. A pretreatment system for film cleaning and recovery according to claim 1, characterized in that: The water inlet assembly includes a water inlet pipe and a plurality of water spray pipes connected to the water inlet pipe; the water outlet of each of the water spray pipes is arranged on the feed hopper; the feed hopper is also provided with a baffle at the water outlet; water is sprayed from the water outlet toward the inner wall of the feed hopper; the water pump is connected to the water inlet pipe.

7. A pretreatment system for film cleaning and recovery according to claim 6, characterized in that: The water level in the sorting water tank is higher than 1 / 2 of the height of the sorting water tank, and the water level does not exceed the bottom of the baffle.

8. A pretreatment system for film cleaning and recovery according to claim 1, characterized in that: The shape of the sorting water tank is an inverted trapezoid, and a support frame is provided at the bottom of the sorting water tank; The discharge port at the bottom of the sorting water tank is communicated with a discharging pipe arranged transversely; the interior of the discharging pipe forms the discharging channel, and the electric rotary valve is arranged on the discharging port of the discharging pipe.

9. A pretreatment system for film cleaning and recovery according to claim 1, characterized in that: The pre-crushing device is provided with a pre-crushing chamber, in which an arc-shaped pressing plate and a pre-crushing roller are arranged below the arc-shaped pressing plate; the arc-shaped pressing plate is also provided with an arc-shaped inclined surface for facilitating the sliding of waste film materials; a metal conveyor belt is also provided on one side of the pre-crushing device, and the metal conveyor belt is used to transport the waste film materials to the feed port.

10. A pretreatment method for film cleaning and recovery, characterized in that: A pretreatment system for film cleaning and recovery as claimed in any one of claims 1 to 9, wherein the method comprises the following steps: Step S1: first preset the water level height in the sorting water tank, turn on the water sorting device, the water spray pipe in the sorting water tank starts to spray water, and the heavy object conveyor belt and the film conveyor belt also start to work; when the liquid level meter detects that the water level is lower than the preset water level line, control to close the electric rotary valve and start the water pump, and inject water to the preset water level line according to the 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 pumping frequency of the water pump, and adjust the water inlet and outlet to keep the liquid level at the preset height; Step S2: Turn on the belt conveyor, the pre-crushing device and the metal conveyor belt in sequence, put the waste film materials onto the metal conveyor belt, and the metal conveyor belt puts the waste film materials into the pre-crushing device from the feed inlet; the waste film materials slide along the inner wall of the pre-crushing device to the pre-crushing roller, at which time the arc-shaped pressing plate presses down the waste film materials, and the pre-crushing roller performs preliminary crushing on the waste film materials; Step S3: the waste film material after the crushing process falls onto the belt of the belt conveyor. At this time, the photoelectric switch on the belt conveyor detects the presence of waste film material, the photoelectric switch is closed, the water pump adjusts the pumping frequency and controls the water flow rate in the sorting water tank, and at the same time adjusts the electric rotary valve to keep the water level in the sorting water 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 liquid level meter detects that the water level exceeds the preset water level line, the alarm will send out an alarm signal, turn off the water pump and stop feeding; Step S4: the waste film material slides from the first sliding plate of the feed hopper to the second sliding plate of the feed hopper, and the water at the water spray pipe is sprayed from the water outlet toward the upper surface of the second sliding plate, and the flowing water rushes the waste film material falling on the second sliding plate to the heavy object conveyor belt; under the impact of water, the waste film material is separated into light materials and hard impurities, the heavy object conveyor belt is used to convey the hard impurities, and the film conveyor belt is used to convey the light materials; 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 so that the fast-flowing water can flush out the accumulated impurities to 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 re-transports the treated water to the water spray pipe for recycling; Step S6: The heavy object conveyor belt transports the hard impurities that have completed preliminary crushing and preliminary cleaning to the collection box; the film conveyor belt transports the light objects to the crusher for subsequent crushing operations.

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