Cleaning spin-drying line for recycling PE agricultural mulching film

Abstract

The invention relates to the technical field of plastic recycling, in particular to a cleaning spin-drying line for PE agricultural mulching film recycling, and relates to the technical field of plastic recycling. The cleaning spin-drying line comprises a pretreatment module, a main treatment module and a dewatering device, the dewatering device comprises a machine body, a rotary drum and a rotary shaft are rotationally arranged on the machine body, the rotary shaft is coaxially arranged in the rotary drum, and spiral blades for pushing materials to advance are arranged on the rotary shaft; the machine body is provided with a driving mechanism for driving the rotary drum and the rotating shaft to perform differential rotation, the machine body is provided with a feed port communicated with the separation cavity and a solid discharge port communicated with the separation cavity, the rotary drum is internally provided with a water guide cavity, the inner wall of the rotary drum is provided with a plurality of micropores communicated with the water guide cavity, and the machine body is provided with a drainage pipeline communicated with the water guide cavity; a pump set is arranged on the side, away from the water guide cavity, of the drainage pipeline and can conduct air inflation, air exhaust and water pumping work. The device has the effect of reducing the moisture in the material.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of plastic recycling, in particular to a cleaning and spin-drying line for PE agricultural mulch film recycling. BACKGROUND

[0002] With the development of agricultural modernization, the use of agricultural mulch film is increasing, and the recycling of the discarded agricultural mulch film has become an important environmental protection issue, and efficient recycling and cleaning are the key prerequisites for the recycling of agricultural mulch film.

[0003] At present, the discarded agricultural mulch film is usually cut into small pieces by a hydraulic cutting machine, and then enters a rotary washing screen for preliminary water washing and screening to remove most of the silt; after being finely broken into smaller pieces by a comprehensive crusher, the surface dirt is stripped by mechanical friction and kneading through a powerful friction washing machine and a square kneading machine; finally, the regenerated pieces are obtained by rinsing in a cleaning tank and centrifugal dewatering in a high-speed dewatering machine.

[0004] However, the existing centrifugal dewatering machine only relies on the centrifugal force generated by the rotation of the screen, and this force is difficult to remove the water trapped by the self-winding structure of the material. SUMMARY

[0005] The purpose of the application is to provide a cleaning and spin-drying line for PE agricultural mulch film recycling, which can reduce the moisture in the material to improve the production quality of the subsequent extrusion process.

[0006] The cleaning and spin-drying line for PE agricultural mulch film recycling provided by the application adopts the following technical scheme: A pretreatment module is used to coarsely crush and coarsely clean the agricultural mulch film; A main treatment module is used to finely crush and finely clean the agricultural mulch film after pretreatment; A dewatering device includes a machine body, a rotating drum and a rotating shaft are arranged on the machine body, the rotating shaft is coaxially arranged in the interior of the rotating drum, a spiral blade for pushing the material to move is arranged on the rotating shaft, a driving mechanism for driving the rotating drum and the rotating shaft to rotate at different speeds is arranged on the machine body, a separation cavity is formed between the rotating drum and the rotating shaft, a feeding port communicating with the separation cavity and a solid discharge port communicating with the separation cavity are arranged on the machine body, a water guide cavity is arranged in the rotating drum, a plurality of micro-holes communicating with the water guide cavity are arranged on the inner wall of the rotating drum, a drainage pipeline communicating with the water guide cavity is arranged on the machine body, and a pump set is arranged on the side of the drainage pipeline away from the water guide cavity. The pump set can perform air charging, air extraction and water extraction.

[0007] Optionally, a plurality of soft blocks are arranged on the spiral blade, and the soft blocks abut against the inner wall of the rotating drum.

[0008] Optionally, the inner wall of the rotating drum is provided with a plurality of protrusions, and the plurality of protrusions correspond one-to-one to the plurality of micropores, and the micropores are arranged on the protrusions.

[0009] Optionally, the feeding port is located at one end of the rotating drum, and the discharging port is located at the other end of the rotating drum.

[0010] Optionally, each soft block is inlaid with a first pressure sensor, and the dewatering device further comprises a control unit electrically connected with the first pressure sensor, the driving mechanism and the pump group.

[0011] Optionally, the dewatering device further comprises a separation assembly, and the separation assembly comprises a separation tank mounted on the machine body, a drain pipe connected with the water outlet end of the pump group is communicated with the side wall of the separation tank, and the drain pipe on the side wall of the separation tank is close to the bottom of the separation tank, and a backflow pipe communicated with the feeding port is communicated with the upper end of the separation tank.

[0012] Optionally, the inside of the separation tank is further provided with a detection assembly for detecting the content of the sediment, and the bottom of the separation tank is further provided with a solenoid valve, and the solenoid valve and the detection assembly are electrically connected with the control unit.

[0013] Optionally, the detection assembly comprises a support plate and a second pressure sensor, the support plate is mounted on the inner wall of the separation tank, and the support plate is a certain distance from the bottom of the separation tank, and the second pressure sensor is mounted on one end of the support plate close to the bottom of the separation tank.

[0014] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application realizes early separation of impurities and plastic by rough crushing and rough cleaning of the agricultural mulch through the pretreatment unit, and then realizes fine crushing and fine cleaning of the agricultural mulch after pretreatment through the main processing module, so that the cleaning of the organic stains and pesticide residues attached to the agricultural mulch is relatively thorough, thereby relatively ensuring that the regenerated plastic sheet has extremely high cleanliness and can meet the production requirements of high-end regenerated products; at the same time, the dewatering device in the present application applies negative pressure to the agricultural mulch material by setting the pump group, the water guide cavity and the micropores, and the combination of negative pressure and centrifugal force can make the agricultural mulch receive greater external force, so as to realize better extrusion of water in the agricultural mulch, and the flow direction of water in the agricultural mulch is radial, and the flow direction of water is consistent with the direction of external force, compared with the axial flow of water in the traditional equipment, the water in the separation cavity can be separated from the separation cavity faster, thereby avoiding the secondary contact between the agricultural mulch and water as much as possible, and further improving the dewatering effect and dewatering efficiency of the device on the material, thereby greatly reducing the moisture content in the agricultural mulch and improving the production quality of the subsequent extrusion process. 2. The spiral arrangement of the soft blocks can not only push the plastic along the discharge port, but also contact the inner wall of the drum, compared with the existing technology, the screw blade and the inner wall of the drum have a gap, the soft block in the application can push the material adhered to the inner wall of the drum to the discharge port, so as to avoid the situation that the inner wall of the drum adheres to the material and reduces the discharge amount of the discharge port, and the soft block can scrape off the material adhered to the inner wall of the drum, realizing the self-cleaning effect of the inner wall of the drum and avoiding the situation that the plastic blocks the micropores; 3. The setting of the protrusions makes the inner wall of the drum uneven, so that when the plastic is in the concave surface of the inner wall of the drum, the soft block will exert an axial force on the plastic due to the spiral setting, and since the plastic is in the concave surface, the plastic will contact the inclined surface of the protrusion when moving in the axial direction, and the inclined surface will exert an axial reaction force on the plastic, so that the soft block and the protrusion will extrude the plastic together, so that the water in the plastic is further extruded, thereby further improving the dehydration effect of the dehydration device on the plastic, and the comprehensive external force of the plastic is still close to the discharge port, so that the material will be repeatedly extruded from the inlet to the outlet, which greatly improves the dehydration effect of the dehydration device on the plastic; 4. According to the original setting, the distance between the spiral blade on the shaft and the inner wall of the drum is usually constant, so the pressure of the inner wall of the drum on each soft block is basically equal, and finally the values displayed by each first pressure sensor are also basically equal. Due to the setting of the protrusions and the vibration of the drum and the shaft during work, the soft block will shrink to a certain extent, so the value of the first pressure sensor will also change to a certain extent, and a range value can be preset in the control unit. When the value displayed by the first pressure sensor is within this range, it means that the drum and the shaft are in normal state, and when the value of one of the first pressure sensors exceeds this range, it means that the drum or the shaft is severely deformed, and the drum and the shaft will be out of balance during rotation, which may cause the drum or the shaft to break. Therefore, when one of the first pressure sensors displays an abnormal value, the control unit will immediately stop and trigger the alarm system for the staff to perform maintenance work; 5. The discharged wastewater is guided into the separator from a position relatively close to the bottom. The less dense plastics float on the surface, while the denser sand and metals settle to the bottom. As more wastewater enters the separator, the water level gradually rises until it reaches the upper pipe. When the water level reaches the inlet, some of the wastewater and the plastic on the surface re-enter the drum for further dehydration. Therefore, the separator not only separates plastics and impurities from the wastewater but also allows the separated plastics to return to the drum for dehydration, minimizing plastic waste. Simultaneously, when some water from the separator returns to the inlet, it flushes the inlet, washing away any plastic adhering to it into the drum, further reducing the overall material loss rate of the production line. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the overall structure of the dehydration device in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the driving component in the embodiments of this application; Figure 4 yes Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the connection between the top shell and the bottom shell in an embodiment of this application; Figure 6 This is a schematic diagram of the connection of the first semi-annular sealing sheet in an embodiment of this application; Figure 7 This is a schematic diagram showing the position of the rotating shaft in an embodiment of this application; Figure 8 This is a partial structural cross-sectional view of an embodiment of this application; Figure 9 This is a schematic diagram of the internal structure of the drum in an embodiment of this application; Figure 10 yes Figure 9 Enlarged structural diagram at point B; Figure 11 yes Figure 9 Enlarged structural diagram at point C; Figure 12 This is a schematic diagram of the structure of the rotating shaft in an embodiment of this application; In the figure, 1, pretreatment module; 11, slitting machine; 12, rotary washing screen; 2, main processing module; 21, comprehensive crushing vehicle; 22, friction washing machine; 23, rubbing washing machine; 24, cleaning tank; 3, dehydration device; 31, machine body; 311, feeding port; 312, solid discharge port; 313, drainage pipeline; 314, pump set; 315, mounting cavity; 3151, first sealing space; 3152, second sealing space; 3153, third sealing space; 316, top shell; 317, bottom shell; 318, first half-ring-shaped sealing piece; 319, second half-ring-shaped sealing piece; 32, rotary drum; 321, water guide cavity; 322, micropore; 323, protrusion; 324, water outlet; 325, solid discharge port; 326, first sealing groove; 327, second sealing groove; 33, rotating shaft; 331, spiral blade; 333, soft block; 335, first pressure sensor; 336, discharge port; 337, feeding channel; 338, feeding pipe; 339, feeding pump; 34, driving mechanism; 341, rotating shaft motor; 342, rotary drum motor; 343, differential; 35, separation assembly; 351, separation tank; 352, drainage pipe; 353, return pipe; 354, electromagnetic valve; 36, detection assembly; 361, support plate; 362, second pressure sensor; 4, conveyor belt device; 5, mobile bin. DETAILED DESCRIPTION

[0016] The following will be described in detail with reference to the accompanying drawings. Figures 1-12 The application will be further described in detail.

[0017] A cleaning and drying line for PE agricultural mulch recycling, referring to Figure 1 , comprising a pretreatment module, a main processing module and a dehydration device.

[0018] The pretreatment module in the embodiment includes a slitting machine and a rotary washing screen.

[0019] The slitting machine in the embodiment is a twelve-square hydraulic slitting machine, with a power of 30KW, and the rotary washing screen has a power of 4KW. A conveyor belt device is arranged between the slitting machine and the rotary washing screen. The slitting machine cuts the agricultural mulch into small pieces, which are then sent to the rotary washing screen through the conveyor belt device. When the agricultural mulch enters the rotary washing screen, the rotary washing screen can separate the qualified material and the unqualified material and discharge them respectively. The twelve-square hydraulic slitting machine and the rotary washing screen are both prior art, and will not be described in detail here.

[0020] The main processing module in the embodiment includes a comprehensive crushing vehicle, a mobile bin, two friction washing machines, a rubbing washing machine and a cleaning tank.

[0021] The comprehensive crushing vehicle in the embodiment is a large comprehensive crushing vehicle, and has a power of 200 KW. The comprehensive crushing vehicle can further crush the small section of agricultural mulch. A conveying belt device is arranged between the comprehensive crushing vehicle and the mobile bin. The conveying belt device conveys the crushed agricultural mulch into the mobile bin. The mobile bin is a device for temporarily storing the crushed agricultural mulch. A conveying belt is arranged at the bottom of the bin. A conveying belt device is arranged between the mobile bin and the friction washing machine. The conveying belt at the bottom of the mobile bin can convey the material in the bin to the discharge port, and then the material is conveyed into one of the friction washing machines through the conveying belt device. The mobile bin controls the amount of material entering the friction washing machine per unit time. The friction washing machine in the embodiment is a strong friction washing machine, and has a power of 30 KW. The friction washing machine can remove various impurities such as mud, oil stains, paper pulp and cleaning machines attached to the material. At the same time, the friction washing machine rapidly separates the sewage generated in the link from the raw material. Then the material washed is sent to the square rubbing machine. The square rubbing machine in the embodiment has a power of 75 KW. The square rubbing machine can further remove the impurities attached to the surface of the material. The material is rubbed and washed by spraying at the same time. The sewage generated in the link is rapidly separated from the raw material. Then the raw material is sent to another friction washing machine for further friction cleaning. Then the friction washing machine sends the cleaned material to the cleaning sink for rinsing. The cleaning sink in the embodiment has a power of 30 KW. The cleaning sink can wash away the mud and paper scraps in the plastic. The device has a sludge impurity discharging machine at the bottom. A floating material cleaning and advancing cylinder is arranged at the upper end of the device. The floating material cleaning and advancing cylinder can push the cleaned plastic into the dehydration device for dehydration.

[0022] The traditional process is to break a large bundle of agricultural film into small size at one time, and the hard impurities such as mud, stones and metals mixed together are also broken at the same time, which are difficult to separate, resulting in rapid deterioration of the cleaning water quality, poor cleaning effect, and finally high impurity content of the regenerated material. The cleaning line in the embodiment is first "coarse broken", and only the large roll film is broken into an easily handled medium size sheet. Then it enters the "turning washing" link, and most of the attached heavy impurities such as mud and stones are separated out in advance before the material is further crushed by using water rolling and screening. This greatly reduces the load of the subsequent fine breaking equipment and cleaning system, avoids over crushing of impurities, and lays a foundation for obtaining regenerated fragments with high purity; at the same time, the traditional process may only rely on one or two cleaning methods (such as only friction washing or only rinsing), which is not thorough for cleaning of firmly attached organic stains, pesticide residues, etc. The cleaning line adopts the way of "turning washing (pre-washing) + strong friction washing + kneading washing + rinsing", which ensures that the regenerated plastic sheet has extremely high cleanliness and can meet the production requirements of high-end regenerated products, greatly improving the quality of plastic particles produced in the subsequent extrusion process.

[0023] Referring to Figure 2 Figure 3 The dehydration device in the embodiment includes a body, a rotating drum and a rotating shaft (combined Figure 5 and Figure 7 ).

[0024] A bottom shell is fixedly arranged above the body, a top shell is detachably mounted above the bottom shell, the top shell and the bottom shell constitute a mounting cavity of the rotating drum, the rotating drum is arranged in the mounting cavity in the horizontal direction, and both ends of the rotating drum are rotatably installed on the bottom shell. The rotating shaft is coaxially located inside the rotating drum, a separation cavity is formed between the rotating drum and the rotating shaft, helical blades for pushing the material to move are arranged on the outer wall of the rotating shaft, and a certain distance exists between the helical blades and the inner wall of the rotating drum. A driving mechanism for driving the rotating drum and the rotating shaft to differentially rotate is arranged on the body. The driving mechanism in the embodiment includes a main driving motor, a main driving pulley, an auxiliary motor, an auxiliary motor pulley and a differential, etc. In the embodiment, one end of the rotating shaft extends to the outside of the rotating drum, the other end of the rotating shaft is rotatably connected with the inner wall of the rotating drum, a sealing bearing (not shown in the figure) is arranged between the rotating shaft and the rotating drum, a feeding port is arranged at the end of the rotating shaft extending to the outside of the rotating drum, the feeding port is a feeding hopper in the embodiment, one end of the rotating shaft is inserted into the feeding port, and a feeding channel is coaxially arranged at the end of the rotating shaft located in the feeding port (combined Figure 8 and Figure 9), a rotating shaft is sealingly connected with a feeding pipe at one end of the feeding port, the feeding pipe is in communication with the feeding channel, a feeding pump is arranged on the feeding pipe, one end of the feeding pipe away from the rotating shaft is in communication with the feeding port, and the feeding funnel is sealingly connected with the outer wall of the feeding pipe, a discharging port in communication with the feeding channel is arranged on the outer wall of the rotating shaft, the length of the feeding channel in the embodiment is relatively short, the discharging port is located in the rotary drum and relatively close to one end of the rotary drum close to the feeding port, the main driving pulley is coaxially fixedly installed on the outer wall of the rotating shaft and located outside the rotary drum, the main driving motor is installed on the machine body and located at one end of the rotating shaft close to the feeding port, a belt is arranged between the output shaft of the main driving motor and the main driving pulley, the main driving motor rotates to drive the rotating shaft to rotate, the differential mechanism and the auxiliary motor are arranged at the other end of the rotating shaft, the differential mechanism is coaxially arranged with the rotary drum, and the output end of the differential mechanism is fixedly connected with the rotary drum in a coaxial mode, the auxiliary motor pulley is fixedly connected with the output shaft of the differential mechanism in a coaxial mode, a belt is arranged between the output shaft of the auxiliary motor and the auxiliary motor pulley, the auxiliary motor rotates to drive the differential mechanism to start, so as to drive the rotary drum to rotate, through specific setting, the rotary drum and the rotating shaft rotate in the same direction, but there is a certain difference between the rotating speed of the rotary drum and the rotating speed of the rotating shaft, the motor, the main driving pulley, the auxiliary motor, the auxiliary motor pulley and the differential mechanism in the embodiment are all prior art, and will not be described in detail here.

[0025] With reference to Figure 5 , Figure 6 and Figure 7 , the outer wall of the rotary drum is provided with a solid discharging port, the solid discharging port is relatively close to the auxiliary motor, and the machine body is provided with a solid discharging port, the outer wall of the rotary drum in the embodiment is provided with a first sealing groove, the top shell and the bottom shell are respectively provided with a first half-ring-shaped sealing piece, when the top shell and the bottom shell are buckled, the first half-ring-shaped sealing pieces on the top shell and the bottom shell are inserted into the first sealing groove of the rotary drum, and the two half-ring-shaped sealing pieces are enclosed into a complete first ring-shaped sealing piece, at this time, the first ring-shaped sealing piece divides the mounting cavity into a first sealing space and a second sealing space, the second sealing space is relatively close to the feeding port, the solid discharging port is in communication with the first sealing space, and the solid discharging port is arranged on the bottom shell and in communication with the first sealing space.

[0026] With reference to Figure 8 and Figure 9The outer circumferential wall of the rotating drum in the embodiment is provided with a water guide cavity, the inner wall of the rotating drum is uniformly provided with a plurality of micropores in an array which are in communication with the water guide cavity, the micropores in the embodiment have a diameter of 1-2mm, which allow water to pass through but not plastic, the inner walls of the bottom shell and the top shell are further provided with two groups of second half annular sealing pieces, each group is provided with two second half annular sealing pieces, the two second half annular sealing pieces are arranged in a horizontal direction, the two second half annular sealing pieces of the two groups of second half annular sealing pieces correspond to each other, the outer wall of the rotating drum is provided with two second sealing grooves, the two second sealing grooves correspond to the two second half annular sealing pieces of one group, when the top shell and the bottom shell are combined together, one of the second half annular sealing pieces on the top shell and the corresponding second half annular sealing piece on the bottom shell form a second annular sealing piece, the other second half annular sealing piece on the top shell and the corresponding second half annular sealing piece on the bottom shell also form a second annular sealing piece, and each second half annular sealing piece is inserted into the second sealing groove, therefore the two groups of second half annular sealing pieces, the top shell, the bottom shell and the rotating drum independently develop a third sealing space in the second sealing space, and the third sealing space is located at the central position of the mounting cavity, the outer circumferential wall of the rotating drum is provided with a plurality of water outlets in communication with the water guide cavity, the plurality of water outlets are uniformly and spacedly arranged around the rotating drum axis, and the plurality of water outlets are located in the third sealing space, the bottom shell is provided with a water outlet groove in communication with the third sealing space, the bottom of the bottom shell is provided with a drainage pipeline in communication, and the end of the drainage pipeline away from the water outlet groove is in communication with a pump group, the pump group in the embodiment can perform air inflation, air extraction and water extraction work. It should be noted that all the sealing pieces in the embodiment are made of fluororubber which has extremely high wear resistance, high temperature resistance and oil resistance.

[0027] When the material passing through multiple cleaning processes enters the feed inlet of the dewatering device, the main drive motor, auxiliary motor, feed pump and pump group are all in the starting state at this time, and the pump group is in the pumping state at this time, therefore, the rotating drum and the rotating shaft are both in the state of self-rotation, and the rotating direction of the rotating drum and the rotating shaft is the same, and the rotating speed of the rotating drum is slightly faster than that of the rotating shaft, and at the same time, under the driving of the feed pump, the feed pipe will suck the material in the feed inlet into the feed channel in the rotating shaft, because the rotating shaft is in the rotating state, therefore, the material in the feed channel will be thrown into the separation cavity from the discharge port on the rotating shaft due to the centrifugal force, and the material entering the separation cavity will be subjected to strong centrifugal force due to the rotation of the rotating drum, therefore, the material will be tightly attached to the inner wall of the rotating drum, and at this time, the material is still subjected to the centrifugal force of the rotating drum and is extruded, so that the water in the material is extruded out, thereby realizing the dewatering effect of the material, and the water extruded from the material enters the water guide cavity through the micropores on the inner wall of the rotating drum, the pore size of the micropores is relatively small, only allowing water to pass through, and the dewatered material (plastic) cannot pass through the micropores, therefore, the separation of plastic and water is realized, and under the pushing of the helical blade on the rotating shaft, the plastic on the inner wall of the rotating drum will be subjected to an axial pushing force, and the plastic on the inner wall of the rotating drum will move in the direction close to the first sealing space, when the plastic moves to the solid discharge port on the rotating drum, the plastic is thrown into the first sealing space from the solid discharge port due to the centrifugal force, the plastic in the first sealing space has completed the dewatering work, at this time, the plastic is discharged from the fixed discharge port below the bottom shell under the action of gravity; at the same time, when the water in the material on the inner wall of the rotating drum enters the water guide cavity due to the extrusion force, at this time, the water enters the water guide cavity from the separation cavity due to the centrifugal force, that is, the pressure in the separation cavity is higher than that in the water guide cavity, and the water can enter the water guide cavity from the separation cavity, and at this time, under the action of the pump group, the pump group further separates the water and gas in the water guide cavity from the third sealing space and the drainage pipeline in turn, therefore, the pressure in the water guide cavity is further reduced, and the pressure difference between the water guide cavity and the separation cavity is further increased, therefore, at this time, the plastic on the inner wall of the rotating drum is subjected to the centrifugal force and the negative pressure generated by the pump group, and the plastic will be further extruded under the action of the double forces, so that the water remaining in the plastic is more easily extruded out, thereby greatly improving the dewatering rate of the plastic, that is, improving the dewatering effect of the dewatering device on the material.

[0028] In addition, the distance between the discharge port on the rotating shaft (i.e., the position where the material enters the separation chamber) and the solid discharge port on the rotating drum (i.e., the position where the dehydrated material exits the separation chamber) in the present embodiment is substantially the axial length of the rotating drum, so the distance that the material in the separation chamber moves during axial movement is the length of the rotating drum. In the prior art, the discharge port on the rotating shaft is usually arranged at the middle position of the separation chamber, so the distance that the material in the separation chamber moves during axial movement is half the length of the rotating drum. Therefore, under the same rotating speed and the same angle of the helical blade, the material in the separation chamber in the present embodiment takes longer to undergo dehydration, so the dehydration device in the present embodiment has a better dehydration effect than the prior art.

[0029] In the present embodiment, a plurality of soft blocks are arranged on the helical blade, preferably twelve soft blocks, which are uniformly and spacedly arranged on the helical blade. The soft blocks in the present embodiment are also made of fluorine rubber (in combination with the above description of the helical blade). Figure 12 ].

[0030] When the material is dehydrated in the separation chamber, due to the gap between the helical blade and the inner wall of the rotating drum, a small amount of plastic may remain on the inner wall of the rotating drum and cannot be subjected to the axial thrust of the helical blade, thereby reducing the production of dehydrated plastic. In addition, this part of the plastic may also block part of the micropores, thereby reducing the drainage rate. In the present embodiment, the soft blocks of the helical blade are in constant contact with the inner wall of the rotating drum, and the soft blocks can scrape off the plastic on the inner wall of the rotating drum that cannot move axially. In addition, the twelve soft blocks in the present embodiment are arranged on the helical blade, and the helical blade itself is arranged at a certain angle, so it can push the material axially. Therefore, when the soft blocks scrape off the plastic on the inner wall of the rotating drum, the soft blocks can also push the plastic adhering to the inner wall of the rotating drum axially, so that the plastic adhering to the rotating drum can also move to the fixed discharge port on the rotating drum, thereby ensuring the normal yield of the dehydrated material. In addition, the soft blocks also avoid the situation that the plastic blocks the micropores during the process of axially scraping off the plastic, thereby also ensuring the drainage efficiency of the dehydration device and maintaining the unobstructed state of the micropores, so as to maintain the maximum pressure difference between the separation chamber and the water guide chamber as much as possible, so that the plastic in the separation chamber is always in a relatively maximum pressure state, thereby ensuring the dehydration effect of the dehydration device as much as possible.

[0031] It should be noted that the soft block in the embodiment adopts fluorine rubber, which is not rigid friction with the inner wall of the rotating drum, and the separation cavity basically has water, so the friction between the soft block and the inner wall of the rotating drum basically will not affect the rotating drum, and at the same time, since the soft block itself has elasticity, the soft block can abut against the inner wall of the rotating drum at any time, so as to facilitate the soft block to scrape off the plastic, and can also try to avoid that the soft block and the rotating drum generate too large radial abutment force, so as to cause the radial deformation of the rotating drum and the rotating shaft, so that a protection measure is also applied to the rotating drum and the rotating shaft as a whole, and the probability of equipment damage is reduced; in addition, the twelve soft blocks are continuously arranged on the horizontal plane, and are spaced apart on the vertical plane, so that the sum of the areas swept by the twelve soft blocks on the inner wall of the rotating drum is the total area of the inner wall of the rotating drum, that is, the twelve soft blocks can scrape every place of the inner wall of the rotating drum, and the spacing of the twelve soft blocks on the vertical plane can also make the torque generated on the rotating shaft abut against each other when the rotating shaft rotates, that is, the rotating shaft can keep a dynamic balance state, thereby reducing the probability of damage of the rotating shaft.

[0032] Further need to explain is, the dehydration device completes all material dehydration work, the inner wall of the drum and the outer wall of the shaft inevitably still remain some plastics, if these residual plastics are not cleaned, the residual plastics on the inner wall of the drum and the outer wall of the shaft will be more and more over time, and it is difficult to clean, it will seriously damage the dynamic balance of the drum and the shaft during work, it is easy to cause damage to the drum and the shaft, therefore, the prior art will periodically remove the drum and the shaft, clean the residual plastics on the drum and the shaft, and then install the drum and the shaft back after cleaning is completed; The soft block in the embodiment has started to scrape and clean the attached plastics on the inner wall of the drum during work, and the attached plastics are cleaned to the solid discharge port on the drum to facilitate the smooth discharge of the dehydrated plastics, so the soft block in the embodiment has realized the function of cleaning while working, and the dehydration device can continue to operate after completing the dehydration work, which facilitates the cleaning work of the soft block on the inner wall of the drum, and more importantly, the pump group in the embodiment can also be inflated, so when the dehydration work is completed, the pump group can inflate the drainage pipeline, the gas will flow through the drainage pipeline, the third sealing space, the water guide cavity, the micro hole and the separation cavity, during the operation of the dehydration device, part of the plastics may have entered the micro hole and blocked the micro hole, the plastics in the micro hole are difficult to be scraped by the soft block, and at this time the gas flows from the water guide cavity to the separation cavity, the gas can blow the plastics blocked in the micro hole back to the separation cavity, at this time the dehydration device is still in operation, so the small amount of plastics will again experience the dehydration step, and after dehydration, the soft block pushes it to the solid discharge port on the inner wall of the drum, at the same time, all the micro holes in the embodiment are opposite to the shaft, so the gas coming out of the micro hole will directly spray to the outer wall of the shaft, so that some plastics in the dead angle of the shaft and the spiral blade fall off, and then the plastics blown off from the shaft and the spiral blade are also subjected to centrifugal force under the action of the centrifugal force of the drum, and are axially pushed by the soft block, and finally are discharged from the solid discharge port of the drum to the outside of the dehydration device, as described above, the soft block and the pump group are cooperatively arranged to clean the residual plastics on the inner wall of the drum, the outer wall of the shaft and the spiral blade, and finally discharge the residual plastics to the outside of the dehydration device, which realizes the self-cleaning function of the device as a whole, so the workers do not need to disassemble and install the device relatively frequently for cleaning, which greatly reduces the working intensity of the workers.

[0033] Referring to Figure 9 , Figure 10 and Figure 11 , in order to further enhance the dehydration effect of the device, a plurality of protrusions are uniformly arranged on the inner wall of the drum, the protrusions are quarter spherical in the embodiment, the protrusions correspond to the micro holes one by one, the micro holes are located on the protrusions, and there is a gap between the spiral blade and the protrusion.

[0034] The protrusions are arranged so that the inner wall of the rotating drum becomes uneven, and since the soft blocks are made of fluorine rubber and have a certain elasticity, the soft blocks can deform and perfectly fit the uneven curved surface. Therefore, when the plastic is in the concave surface on the inner wall of the rotating drum, the soft blocks will exert an axial force on the plastic in the concave surface. Since the plastic is in the concave surface, the plastic will contact the inclined surface of the protrusion when moving in the axial direction, and the inclined surface will exert an axial counterforce on the plastic. Therefore, the soft blocks and the protrusions will jointly extrude the plastic. The plastic in the separation cavity will be subjected to the centrifugal force of the rotating drum, the negative pressure of the pump set and the extrusion force of the soft blocks, and the application of the three forces can further extrude the water in the plastic, thereby further improving the dewatering effect of the dewatering device on the plastic. The comprehensive external force of the plastic is still close to the discharge port, so the material will undergo repeated extrusion from the discharge port on the rotating shaft to the solid discharge port on the rotating drum, which greatly improves the dewatering effect of the dewatering device on the plastic.

[0035] In addition, each soft block in the embodiment is inlaid with a first pressure sensor (not shown in the figure), and the dewatering device further comprises a control unit electrically connected with the first pressure sensor, the main drive motor, the auxiliary motor and the pump set. The first pressure sensor in the embodiment can be a wireless sensor module such as a WIFI signal sensor or a Bluetooth signal sensor.

[0036] According to the original setting, the distance between the spiral blade on the rotating shaft and the inner wall of the rotating drum is usually constant, so the pressure of the rotating drum on each soft block is basically equal, and therefore the values displayed by each first pressure sensor are basically equal. Due to the arrangement of the protrusions and the vibration of the rotating drum and the rotating shaft during operation, the soft blocks will contract to a certain extent, so the values of the first pressure sensors will also vary within a certain range. A range value can be preset in the control unit. When the value displayed by the first pressure sensor is within this range, it means that the rotating drum and the rotating shaft are in a normal state. When the value of one of the first pressure sensors exceeds this range, it means that the rotating drum or the rotating shaft has undergone serious deformation, and the rotating drum and the rotating shaft will be out of balance during rotation, which can easily cause the rotating drum or the rotating shaft to break. Therefore, when the value of one of the first pressure sensors is abnormal, the control unit will immediately stop and trigger the alarm system for the workers to perform maintenance work.

[0037] Secondly, with reference to Figure 3 and Figure 4 The dewatering device in the embodiment further comprises a separation assembly, and the separation assembly in the embodiment comprises a separation tank.

[0038] The separation tank is installed on the machine body, a drain pipe connected with the water outlet of the pump group is communicated with the side wall of the separation tank, and the drain pipe on the side wall of the separation tank is close to the bottom of the separation tank, and the upper end of the separation tank is communicated with a backflow pipe communicated with the feed inlet.

[0039] The drain pipe and the pump group guide the discharged waste water from the position close to the bottom of the separation tank into the separation tank, the plastic with lower density floats on the water surface, and the sand and metal with higher density sink to the bottom of the separation tank, so as the more and more waste water enters into the separation tank, the water surface in the separation tank gradually rises to the backflow pipe on the upper end surface, when the water surface rises to the communication position of the backflow pipe and the feed inlet, part of the waste water and the plastic on the water surface re-enters the drum from the feed inlet to be dehydrated again, so that the setting of the separation tank not only separates the plastic and impurities in the waste water, but also makes the plastic separated from the waste water return to the drum to be dehydrated, so as to avoid the waste of plastic as much as possible; meanwhile, the part of the water in the separation tank re-reaches the feed inlet, so as to flush the feed inlet, so that the plastic adhered to the feed inlet can be flushed into the drum, so as to further reduce the material loss rate of the whole production line.

[0040] Further, the detection assembly for detecting the content of the sediment is arranged in the separation tank, the detection assembly comprises a support plate and a second pressure sensor, the support plate is installed on the inner wall of the separation tank, and the support plate is away from the bottom of the separation tank by a certain distance, the height of the separation plate is lower than the communication position of the drain pipe and the separation tank, the second pressure sensor is same as the first pressure sensor, the second pressure sensor is installed on one end of the support plate close to the bottom of the separation tank, and the bottom of the separation tank is further provided with an electromagnetic valve, and the electromagnetic valve and the second pressure sensor are electrically connected with the control unit.

[0041] The more the impurities in the separation tank, the higher the height of the impurities, when the impurities in the bottom of the separation tank are deposited to a certain amount, the impurities will touch and press the second pressure sensor, when the detected value of the second pressure sensor is greater than the preset value in the control unit, the control unit controls the electromagnetic valve to be opened, so as to facilitate the discharge of the impurities and part of the waste water in the separation tank, the discharge of the waste water will cause the liquid level in the separation tank to drop, so that the water pressure at the bottom of the separation tank also drops, so when the detected value of the second pressure sensor drops to a certain value, the control unit controls the electromagnetic valve to be closed, so as to continue the above-mentioned repeated operation.

[0042] Finally, the pump group in the embodiment mainly consists of a pneumatic double diaphragm pump and an air pump. The pneumatic double diaphragm pump can realize liquid pumping work. Since the pneumatic double diaphragm pump can be idling, the pneumatic double diaphragm pump can also perform air pumping work. The pneumatic double diaphragm pump is in communication with the water inlet pipe. The pneumatic double diaphragm pump can extract the liquid and gas in the water guide cavity. The air pump is a common air pump. The main working principle of the pump group is to set a three-way electromagnetic valve between the drain pipe, the pneumatic double diaphragm pump and the air pump. The three-way electromagnetic valve is also electrically connected with the control unit. When the dehydration device performs dehydration work, the control unit controls the valve between the pneumatic double diaphragm pump and the drain pipe to open and controls the valve between the air pump and the drain pipe to close. When the dehydration device performs self-cleaning work, the control unit controls the valve between the pneumatic double diaphragm pump and the drain pipe to close and controls the valve between the air pump and the drain pipe to open.

[0043] The working principle of the cleaning and drying line for PE agricultural mulch recycling in the embodiment is as follows: the staff puts the recycled agricultural mulch into the twelve-gird hydraulic cutting machine for rough breaking, then the rough broken material is sent to the rotary washing screen through the conveying belt device, then the material treated by the rotary washing screen enters the large comprehensive crushing vehicle for fine crushing, then the fine crushed material is sent to the mobile hopper through the conveying belt device, then the material in the mobile hopper is sent into the friction washing machine through the conveying belt device, the material washed by the friction washing machine enters the rubbing washing machine, then the rubbed material enters another friction washing machine for cleaning, the material cleaned by the second friction washing machine is sent to the cleaning sink for rinsing, and the rinsed material is sent to the dehydration device for dehydration.

[0044] The material first enters the feed inlet, the feed pump will suck the material in the feed inlet into the feed channel in the rotating shaft, the material in the feed channel will be thrown into the separation cavity from the discharge port on the rotating shaft due to the centrifugal force, and the material entering the separation cavity will be subjected to strong centrifugal force due to the rotation of the rotary drum, so the material will adhere to the inner wall of the rotary drum, and at this time the material is still subjected to the centrifugal force of the rotary drum and the negative pressure generated by the pump set, so that the water in the material is squeezed out, and at the same time, under the action of the spiral blade and the soft block, the material in the rotary drum will move axially, and due to the protrusions on the inner wall of the rotary drum, the soft block will generate axial extrusion force on the plastic, so that the material on the inner wall of the rotary drum will be subjected to centrifugal force, negative pressure and extrusion force of the soft block, thereby greatly improving the dehydration rate of the plastic. The water separated from the plastic enters the water guide cavity under the action of the pump set and the centrifugal force, then flows through the water guide cavity, the third closed space, the drainage channel and the water inlet pipe into the separation tank, the separation tank separates the plastic and impurities, and sends the plastic back to the feed inlet on the machine body, and the dehydrated plastic is moved from the discharge port on the rotating shaft to the solid discharge port on the rotary drum under the axial pushing of the spiral blade and the soft block, and finally is discharged from the dehydration device to complete the dehydration of the material.

[0045] After the dehydration work is completed, the control unit continues to control the rotary drum, the rotating shaft and the pump set to work, and controls the pump set to blow gas. The gas will flow through the drainage pipeline, the third sealed space, the water guide cavity, the micro hole and the separation cavity in turn. During the operation of the dehydration device, part of the plastic may have entered the micro hole and blocked the micro hole. The plastic in the micro hole is difficult to be scraped by the soft block, and at this time the gas flows from the water guide cavity to the separation cavity, and the gas can blow the plastic blocked in the micro hole back into the separation cavity. At this time, the dehydration device is still in operation, so the small amount of plastic will again undergo the dehydration step, and after dehydration, it is pushed by the soft block to the solid discharge port on the inner wall of the rotary drum. At the same time, all the micro holes in the embodiment are opposite to the rotating shaft, so the gas from the micro holes will directly spray to the outer wall of the rotating shaft, so that some plastic in the dead angle of the rotating shaft and the spiral blade will fall off, and then the plastic falling off from the rotating shaft and the spiral blade will also undergo dehydration and axial pushing by the soft block under the action of the centrifugal force of the rotary drum, and finally be discharged from the solid discharge port of the rotary drum to the outside of the dehydration device.

[0046] The embodiments of the specific implementation are the preferred embodiments of the present application, not limited to the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A washing and drying line for recycling PE agricultural film, characterized in that, include: The pretreatment module is used to coarsely crush and coarsely wash the agricultural film; The main processing module is used to finely crush and clean the pre-treated agricultural film; A dewatering device includes a body on which a drum and a shaft are rotatably mounted. The shaft is coaxially arranged inside the drum and has spiral blades for propelling the material. The body has a drive mechanism for differentially rotating the drum and shaft. A separation chamber is formed between the drum and the shaft. The body has a feed inlet and a solid discharge outlet communicating with the separation chamber. A water guiding chamber is provided inside the drum, and several micropores communicating with the water guiding chamber are provided on the inner wall of the drum. A drain pipe communicating with the water guiding chamber is provided on the body. A pump set is provided on the side of the drain pipe away from the water guiding chamber, and the pump set is capable of inflating, deflating, and pumping water.

2. The washing and drying line for recycling PE agricultural film according to claim 1, characterized in that, The spiral blades are provided with multiple soft blocks, and the soft blocks abut against the inner wall of the drum.

3. The washing and drying line for recycling PE agricultural film according to claim 2, characterized in that, The inner wall of the drum is provided with a number of protrusions, and each of the protrusions corresponds to a number of micropores. The micropores are provided on the protrusions.

4. A washing and drying line for recycling PE agricultural film according to claim 2, characterized in that, The feed inlet is located at one end of the drum, and the discharge outlet is located at the other end of the drum.

5. A washing and drying line for recycling PE agricultural film according to claim 2, characterized in that, Each of the soft blocks is embedded with a first pressure sensor. The dehydration device also includes a control unit, which is electrically connected to the first pressure sensor, the drive mechanism, and the pump group.

6. A washing and drying line for recycling PE agricultural film according to claim 5, characterized in that, The dehydration device also includes a separation component, which includes a separation tank mounted on the machine body. The side wall of the separation tank is connected to a drain pipe that is connected to the outlet of the pump unit, and the drain pipe on the side wall of the separation tank is close to the bottom of the separation tank. The upper end of the separation tank is connected to a return pipe that is connected to the feed inlet.

7. A washing and drying line for recycling PE agricultural film according to claim 6, characterized in that, The separation tank is also equipped with a detection component for detecting sediment content, and a solenoid valve is installed at the bottom of the separation tank. Both the solenoid valve and the detection component are electrically connected to the control unit.

8. A washing and drying line for recycling PE agricultural film according to claim 7, characterized in that, The detection assembly includes a support plate and a second pressure sensor. The support plate is installed on the inner wall of the separation tank and is a certain distance away from the bottom of the separation tank. The second pressure sensor is installed on the end of the support plate near the bottom of the separation tank.

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