Batch pretreatment equipment and method for recycled plastics

Abstract

The present invention relates to the technical field of plastic recycling and processing, and discloses a batch preprocessing device and processing method for recycled plastics, including a front frame and a rear frame, the top of the front frame is provided with a sorting component for preliminary processing of plastics and a crushing component for crushing the plastics after sorting, and the top of the front frame and located between the sorting component and the crushing component is provided with a chain plate elevator for conveying plastics. The equipment of the present invention has a high degree of integration and automation, and the equipment occupies a small area, which not only saves equipment investment funds and maintenance costs, but also achieves higher processing efficiency, and can complete the pre-sorting operation before plastic crushing through the sorting component, effectively avoiding the problem of harder materials mixed into the plastics and causing irreversible damage to the crushing blades, and through the linkage mechanism, the transfer box is shaken and vibrated during the process of being separated from the cleaning component, effectively improving the subsequent plastic drying efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of plastic recycling and processing, and in particular to a batch preprocessing device and a processing method for recycled plastics. Background Art

[0002] With the widespread use of plastic products, the disposal of waste plastics has become a serious environmental problem. At present, the main methods for treating waste plastics are landfill, incineration and recycling. However, landfill and incineration will cause serious pollution to the environment, while recycling is an environmentally friendly and economical method in the recycling process.

[0003] Waste plastics need to be pre-processed, including crushing, cleaning and drying, in order to facilitate subsequent recycling. However, there are still the following problems in the pre-processing of waste plastics for batch recycling:

[0004] 1. At present, when pre-treating plastics, due to the large number of processes, different processes use a large number of equipment, the equipment integration level is low, the equipment occupies a large area, the equipment investment and maintenance costs are also high, and the material transfer in different processes is also cumbersome;

[0005] 2. Plastics are easily mixed with hard materials such as iron castings and stones, which will cause irreversible damage to the crushing blades. Therefore, plastics need to be pre-sorted. How to sort them effectively, quickly and accurately is an urgent problem to be solved.

[0006] 3. When transferring from the cleaning station to the drying station, the plastic will be attached with more water, which will greatly affect the subsequent drying efficiency. Therefore, how to improve the drying efficiency while meeting the high degree of integration of the equipment and reducing the floor space and equipment investment is also an urgent problem to be solved. Summary of the invention

[0007] Technical issues solved

[0008] In view of the deficiencies in the prior art, the present invention provides a batch pretreatment device and a treatment method for recycled plastics, which are mainly used to solve the current problem that when pretreating plastics, due to the large number of processes, different processes use a large number of equipment, the degree of equipment integration is low, the equipment occupies a large area, the equipment investment capital and maintenance costs are also high, and the material transfer in different processes is also cumbersome. In addition, since plastics are easily mixed with harder materials such as iron castings and stones, such materials will cause irreversible damage to the crushing blades. Therefore, the plastics need to be pre-sorted. How to effectively, quickly and accurately sort the plastics is an urgent problem to be solved. At the same time, when transferring from the cleaning station to the drying station, the plastics will adhere to more water, which greatly affects the subsequent drying efficiency. Therefore, how to meet the high degree of integration of the equipment and improve the drying efficiency while reducing the floor space and equipment investment capital is also an urgent problem to be solved.

[0009] Technical Solution

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A batch preprocessing equipment for recycled plastics comprises a front frame and a rear frame, the top of the front frame is provided with a sorting component for preliminary processing of the plastics and a crushing component for crushing the plastics after sorting, the top of the front frame and located between the sorting component and the crushing component is provided with a chain plate type elevator 1 for conveying the plastics, the interior of the rear frame is provided with a cleaning component for secondary cleaning of the crushed plastics, a drying component for drying the cleaned plastics and a screening component for classifying the crushed large and small plastic pieces, the cleaning component, the drying component and the screening component are arranged in sequence, the top of the rear frame is provided with a shifting component for transferring the crushed plastics to different stations through a ball screw linear module, and a positioning component for accurately positioning the position of the rear frame is provided between the rear frame and the shifting component, the top of the rear frame is fixedly connected with a positioning bucket, and the top of the front frame and located between the crushing component and the positioning bucket is provided with a chain plate type elevator 2 for conveying the plastics crushed by the crushing component.

[0012] Furthermore, the cleaning component and the drying component each include a shell, and the two shells are fixedly connected to the inside of the rear frame. The shell is provided with a avoidance chamber in the middle position, which is proportionally enlarged to the shape of the shifting box. The bottom inner wall of the shell is fixedly connected to two oppositely distributed support frames. One side of the two shells is rotatably connected to a connecting shaft through a bearing, and one end of the connecting shaft is fixedly connected to a driving gear. The bottom of the shell is threadedly connected to a slag discharge cover. Two groups of ultrasonic transducers 2 are provided in the shell of the cleaning component, and an ultrasonic generator connected to the ultrasonic transducer 2 is provided under the shell. The drying A heating wire is provided inside the shell of the drying component and on the inner wall of the avoidance chamber, and the screening component includes a screening box body, which is fixedly connected to the interior of the rear frame body, and the interior of the screening box body is respectively hinged with a screening mesh plate and a screening inclined plate fixedly connected thereto, and one side of the screening box body is respectively welded with an upper discharge hopper and a lower discharge hopper connected to the screening mesh plate and the screening inclined plate, and the other side of the screening box body is rotatably connected to a driven shaft 1 through a bearing, and one end of the driven shaft 1 is fixedly connected to a cam that can contact the bottom of the screening mesh plate, and a rack rack is fixedly connected to the top inner wall of the rear frame body and located above the screening box body.

[0013] On the basis of the above scheme, the movement assembly includes a crossbeam, which is fixedly connected between the two slides of the ball screw linear module, and the slide is slidably connected inside the crossbeam, and the two ends of the slide are respectively rotatably connected with a fixed shaft one and a fixed shaft two, a movement box is welded between the fixed shaft one and the fixed shaft two, and a plurality of groups of drainage grooves are provided on the circumferential outer side of the movement box, and a counterweight bar is fixedly connected to the bottom outer wall of the movement box, a torsion spring is sleeved on the circumferential outer side of the fixed shaft one, and the two ends of the torsion spring are respectively fixed to the fixed shaft one and the slide, and one end of the fixed shaft one is fixedly connected to a driven gear, and a cylinder is fixedly connected to the top of the crossbeam, and one end of the cylinder piston rod passes through the crossbeam and is fixed to the slide, and the cleaning assembly, drying assembly and screening assembly are all provided with a driving assembly, and a linkage mechanism is provided at the bottom of the crossbeam for pre-draining water when the movement box moves up and down.

[0014] As a further solution of the present invention, the linkage mechanism includes a base, which is fixedly connected to the bottom of the beam, and the internal sliding connection of the base is a vertical plate, and the bottom of the base is slidably connected to a fixed rod through a vertical sliding sleeve, one end of the fixed rod is fixed to the vertical plate, and the other end of the fixed rod passes through the base and is fixedly connected to a tension spring, and one end of the tension spring is fixed to the base, and three groups of tooth grooves are provided on one side of the vertical plate, and the three groups of tooth grooves are spaced a certain distance apart, and the lowest tooth of the group of tooth grooves located at the top is meshed with the driven gear. At this time, the shifting box is in an initial state and the opening is vertically upward, and the vertical plate can contact the rack and be squeezed to move.

[0015] Furthermore, the driving assembly includes a driving motor, which is fixedly connected to an outer wall of one side of the rear frame, one end of the driving motor output shaft is fixedly connected to an active synchronous pulley, the other ends of the connecting shafts of the cleaning assembly and the drying assembly are fixedly connected to a force arm, a slide groove is provided inside the force arm, and the bottom inner wall of the rear frame is rotatably connected to two driven shafts 2 through a bearing, one end of the two driven shafts 2 are fixedly connected to a rocker arm, and the rocker arm can move up and down along the slide groove, one side of the two driven shafts 2 and the other end of the driven shaft 1 are fixedly connected to a driven synchronous pulley, and the multiple driven synchronous pulleys are connected to the active synchronous pulley through a synchronous belt transmission, and the bottom inner wall of the rear frame is rotatably connected to a pressure roller for pressing down and positioning the synchronous belt.

[0016] On the basis of the above scheme, the interior of the fixed shaft 2 is connected with a push rod through a key groove and a key strip, one end of the push rod is fixedly connected with a push frame, and the push frame contacts the inner wall of the shifting box, the other end of the push rod is fixedly connected with a dislocation plate, one side of the dislocation plate is fixedly connected with a spring, and one end of the spring is fixed to the two ends of the fixed shaft, and one side inner wall of the shell of the cleaning component and the drying component is fixedly connected with a squeezing ball.

[0017] As a further solution of the present invention, the positioning assembly includes a sensing frame, which is fixedly connected to one side of the moving assembly, and one side of the rear frame is fixedly connected to a plurality of photoelectric switch mounting frames, and one side of the photoelectric switch mounting frames is fixedly connected to a slot-type photoelectric switch, and the plurality of slot-type photoelectric switches respectively correspond to the positioning bucket, cleaning assembly, drying assembly and screening assembly.

[0018] Furthermore, the sorting component includes a brine tank body, which is fixedly connected to the top of the front frame body. The brine tank body is an arc-shaped structure that is narrow on the left and wide on the right. The top at the wider end of the brine tank body is fixedly connected with a guide cover, and one side of the guide cover is connected to a connecting air pipe. Two groups of ultrasonic transducers are provided at the bottom of the brine tank body, and an ultrasonic generator connected to ultrasonic transducer 1 is provided inside the front frame body.

[0019] On the basis of the above scheme, the crushing assembly includes a crushing box, in which a rotating frame is rotatably connected via a bearing, a plurality of groups of rotating tool holders are fixedly connected to the circumferential outer side of the rotating frame, a fixed tool holder cooperating with the rotating tool holder is fixedly connected to the inside of the crushing box, a cover plate is fixedly connected to the bottom of the crushing box, a crushing motor is fixedly connected to an outer wall of one side of the crushing box, and one end of the output shaft of the crushing motor is fixed to the end of the rotating frame via a coupling.

[0020] A method for batch pretreatment of recycled plastics, comprising the following steps:

[0021] S1: When crushing plastics, it is easy for the plastics to be mixed with harder materials such as iron castings and stones, which will cause irreversible damage to the crushing blades. Therefore, it is necessary to pre-sort the plastic parts. First, inject salt water into the salt water box. At this time, the plastic to be processed is poured into the salt water in the salt water box. Since the density of most plastics is lower than that of water, most plastics can float in the water. When the salt content in the water increases, that is, in the salt water, the density of the water will increase. The density of the salt water is higher than that of pure water. Therefore, the salt water can provide greater buoyancy, thereby realizing the separation of plastic parts, iron castings, stones, etc. At the same time, the ultrasonic transducer and the ultrasonic generator can be used to achieve preliminary cleaning of the plastics.

[0022] S2: Then the air pipe is connected to the external air pipe, and the air blowing action of the air guide cover is realized through the external air pipe. Due to the arc-shaped air blowing structure of the air guide cover, the plastic floating in the salt water box is gathered to the narrow end of the salt water box. At this time, the plastic is lifted and transported to the inside of the crushing component by the chain plate elevator.

[0023] S3: Then start the crushing motor, the crushing motor rotates to make the rotating frame drive the rotating knife frame to rotate rapidly, and the plastic inside is crushed by the cooperation of the rotating knife frame and the fixed knife frame. After the crushing, the plastic is lifted and transported to the positioning bucket by the chain plate elevator 2;

[0024] S4: At this time, the transfer assembly is in position 1, and the loading operation from the positioning bucket to the transfer box in the transfer assembly is realized;

[0025] S5: Then the ball screw linear module is used to switch the shifting assembly to position 2, and then the cylinder is started, the cylinder extends to drive the slide and the shifting box to move downward, when the fixed axis 1 and the fixed axis 2 of the shifting box move to contact and support with the two support frames, the driven gear is meshed with the driving gear, and then the drive motor is started, the driving motor rotates to drive the driving synchronous pulley to rotate, the driving synchronous pulley rotates through the synchronous belt to drive multiple driven synchronous pulleys to rotate, the driven synchronous pulley rotates to drive the driven axis 2 to drive the rocker arm to rotate, the rocker arm rotates through the slide groove opened with the force arm, so as to realize the left and right swing of the force arm, and the left and right swing of the force arm makes the driving The gear drives the driven gear to swing, thereby realizing the left and right swing of the shifting box, and ultrasonic cleaning is performed through the second ultrasonic transducer and the ultrasonic generator, so that the debris on the broken plastic in the shifting component can be effectively removed, thereby effectively avoiding the subsequent melting of the plastic affecting the molding quality of the plastic, and the dislocation plate is squeezed by the squeezing ball, so that the dislocation plate drives the push frame to move inward through the push rod. At this time, when the shifting box rotates, the fixed shaft 2 drives the push rod and the dislocation plate to rotate through the key slot and the key bar, and under the elastic force of the spring, the push frame can be moved left and right, and the plastic in the shifting box is effectively moved through the push frame, further improving the cleaning speed;

[0026] S6: After cleaning is completed, the cylinder is shortened to drive the slide and the shift box to move upward. At this time, the driven gear is meshed with the group of teeth at the bottom, so that the driven gear rotates along the teeth and drives the shift box to rotate. When it moves to the point where it is disengaged from the group of teeth at the bottom, the shift box rotates in the opposite direction and resets under the dual action of the torsion spring and the counterweight bar. The cylinder continues to shorten, so that the driven gear is meshed with the group of teeth in the middle, and the above actions are repeated until the cylinder is shortened and reset to the initial state. At this time, the lowest teeth of the group of teeth at the top are meshed with the driven gear. At this time, the shift box is in the initial state with the opening vertically upward, so that the shift box can be swung and shaken during the process of being separated from the cleaning component. At this time, the water on the shift box and the internal plastic is effectively reduced, and the subsequent plastic drying efficiency is effectively improved.

[0027] S7: Then the ball screw linear module is used to switch the moving component to position three, and the above actions are repeated, so that the moving box is extended into the drying component, and then the heating wire provided in the drying component is used for effective drying, and the temperature needs to be controlled during drying to prevent the plastic from melting;

[0028] S8: After the drying is completed, the cylinder is shortened to drive the slide and the shifting box to move upward and reset, and then the ball screw linear module is used to switch the shifting assembly to position four. During this process, the rack frame contacts and squeezes the vertical plate, so that the vertical plate moves backward through the fixed rod. At this time, the driven gear is disengaged from the tooth groove on the vertical plate, and then the rack frame is engaged with the driven gear, and the driven gear is rotated along the rack frame, so that the shifting box is turned over and dumped, and the plastic blocks inside are dumped into the screening assembly;

[0029] S9: The crushed plastics are then screened by the screening mesh and the screening inclined plate, and are discharged and classified from the upper and lower discharge hoppers respectively, so as to facilitate the subsequent melting operations of different degrees according to the different sizes of plastics. The driven synchronous pulley rotates through the driven shaft to drive the cam to rotate, and the cam intermittently lifts the screening mesh, thereby realizing the continuous vibration of the screening mesh, and effectively avoiding the blockage of the screening holes of the screening mesh.

[0030] Beneficial Effects

[0031] Compared with the prior art, the present invention provides a batch pretreatment device and a treatment method for recycled plastics, which have the following beneficial effects:

[0032] 1. The present invention transfers plastics among the crushing component, the cleaning component, the drying component and the screening component by means of a shifting component. The equipment has a high degree of integration, a small footprint, and is easy to use and highly automated. It not only saves equipment investment and maintenance costs, but also achieves higher processing efficiency.

[0033] 2. The present invention completes the pre-sorting operation before the plastic is crushed by the sorting component, which effectively avoids the problem that the plastic is easily mixed with harder materials such as iron castings and stones, which may cause irreversible damage to the crushing blades.

[0034] 3. The present invention separates plastic from harder materials such as iron castings and stones by using the brine in the sorting component, which not only solves the problem that water separation causes part of the plastic to sink to the bottom, or oil separation causes oil stains on the plastic, which increases the difficulty of cleaning, but also realizes the rapid convergence of suspended plastics through the arc-shaped structure of the guide cover and the brine box that is narrow on the left and wide on the right.

[0035] 4. The present invention realizes accurate positioning of the shifting component at four positions of the positioning bucket, the cleaning component, the drying component and the screening component through the positioning component.

[0036] 5. The present invention arranges ultrasonic transducer 1 in the sorting component to perform preliminary cleaning of the plastic, and arranges ultrasonic transducer 2 in the cleaning component to perform secondary cleaning, so that the plastic cleaning is more thorough.

[0037] 6. The present invention adopts a linkage mechanism to make the transfer box swing and shake during the process of separating from the cleaning component, so that the water on the transfer box and the internal plastic is thrown out to a certain extent. At this time, the water on the transfer box and the internal plastic is effectively reduced, and the subsequent plastic drying efficiency is effectively improved.

[0038] 7. The present invention not only realizes the swing of the shifting box in the cleaning component through the driving component to improve the cleaning efficiency and effect of the plastic inside it, but also realizes the swing of the shifting box in the drying component to improve the drying efficiency of the plastic inside it, and at the same time realizes the continuous vibration of the screening mesh plate, effectively avoiding the blockage of the screening holes of the screening mesh plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the three-dimensional structure of a batch pretreatment device for recycled plastics proposed by the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of a sorting component of a recycled plastic batch preprocessing device proposed by the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of a crushing component of a recycled plastic batch preprocessing device proposed by the present invention;

[0042] Figure 4 This is a partially enlarged structural schematic diagram of a recycled plastic batch pretreatment device proposed by the present invention;

[0043] Figure 5This is a schematic diagram of the enlarged structure of part A of a recycled plastic batch pretreatment device proposed by the present invention;

[0044] Figure 6 This is a schematic diagram of the enlarged structure of part B of a recycled plastic batch pretreatment device proposed by the present invention;

[0045] Figure 7 A schematic diagram of the structure of a moving component of a recycled plastic batch pretreatment device proposed by the present invention;

[0046] Figure 8 A schematic cross-sectional view of a transfer box of a recycled plastic batch pretreatment device proposed by the present invention;

[0047] Fig. 9 This is a schematic diagram of the partial decomposition structure of a recycled plastic batch pretreatment device proposed by the present invention;

[0048] Fig.10 This is a schematic diagram of the cleaning component structure of a recycled plastic batch pretreatment device proposed by the present invention;

[0049] Fig.11 This is a schematic diagram of the drying component structure of a batch pretreatment device for recycled plastics proposed by the present invention;

[0050] Fig.12 This is a schematic diagram of the structure of a screening component of a recycled plastic batch pretreatment device proposed by the present invention.

[0051] In the figure: 1. Crushing assembly; 2. Chain plate type elevator 1; 3. Front frame; 4. Sorting assembly; 5. Cleaning assembly; 6. Drying assembly; 7. Rear frame; 8. Screening assembly; 9. Ball screw linear module; 10. Moving assembly; 11. Positioning bucket; 12. Chain plate type elevator 2; 13. Brine box; 14. Ultrasonic transducer 1; 15. Guide cover; 16. Connecting air pipe; 17. Rotating knife holder; 18. Rotating frame; 19. Cover plate; 20. Fixed knife holder; 21. Crushing box; 22. Crushing motor; 23. Positioning assembly; 24. Rack frame; 26. Driven synchronous pulley; 27. Driven shaft 1; 29. ​​Active synchronous pulley; 30. Driving motor; 31. Connecting shaft; 32. Force arm; 33. Slide; 34. Rocker arm; 35. Moving shaft 2; 36, pressure roller; 37, induction frame; 38, slot-type photoelectric switch; 39, photoelectric switch mounting frame; 40, cylinder; 41, slide; 42, crossbeam; 43, holder; 44, fixed rod; 45, tension spring; 46, vertical plate; 47, driven gear; 48, tooth groove; 49, fixed shaft 1; 50, shift box; 51, drain trough; 52, push frame; 53, fixed shaft 2; 54, offset plate; 55, push rod; 56, spring; 57, avoidance chamber; 58, driving gear; 59, squeeze ball; 60, support frame; 61, ultrasonic transducer 2; 62, slag discharge cover; 63, shell; 64, heating wire; 65, cam; 66, screening mesh plate; 67, upper discharge hopper; 68, lower discharge hopper; 69, screening inclined plate; 70, screening box. DETAILED DESCRIPTION

[0052] 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.

[0053] Reference Figure 1-Figure 12, a batch pre-processing equipment for recycled plastics, including a front frame 3 and a rear frame 7, the top of the front frame 3 is provided with a sorting component 4 for preliminary processing of plastics and a crushing component 1 for crushing the plastics after sorting, the top of the front frame 3 and between the sorting component 4 and the crushing component 1 is provided with a chain plate type elevator 2 for conveying plastics, the interior of the rear frame 7 is provided with a cleaning component 5 for secondary cleaning of the crushed plastics, a drying component 6 for drying the cleaned plastics and a screening component 8 for classifying the large and small plastic pieces after crushing, the cleaning component 5, the drying component 6 and the screening component 8 are arranged in sequence, the top of the rear frame 7 is provided with a moving component 10 for transferring the crushed plastics to different stations through a ball screw linear module 9, and a positioning component 23 for accurately positioning its position is provided between the rear frame 7 and the moving component 10, the top of the rear frame 7 is fixed with a positioning bucket 11 by bolts, the top of the front frame 3 and between the crushing component 1 and the positioning bucket 1 1 is provided with a chain plate type elevator 2 12 for conveying the plastic crushed by the crushing component 1. When pre-processing the plastic, it is necessary to crush, clean and dry the plastic. In order to realize the automated pre-processing of the plastic, the various processes of plastic processing should be integrated. Therefore, the plastic is transferred to different processes through the shifting component 10, such as the plastic loading operation in the shifting component 10 is realized through the chain plate type elevator 2 12 and the positioning bucket 11; the plastic in the shifting component 10 is secondary cleaned by the cleaning component 5; the cleaned plastic is dried by the drying component 6; the crushed large and small plastic pieces are classified by the screening component 8. When the plastic is crushed by the crushing component 1, harder materials such as iron castings and stones are easily mixed into the plastic, and such materials will cause irreversible damage to the crushing blades. Therefore, it is necessary to pre-sort the plastic parts, so as to complete the pre-sorting operation before the plastic is crushed by the sorting component 4, and effectively protect the blades of the crushing component 1.

[0054] The cleaning assembly 5 and the drying assembly 6 of the present invention both include a shell 63, and the two shells 63 are fixed to the inside of the rear frame 7 by bolts. The shell 63 is provided with a avoidance chamber 57 in the middle position, which is proportionally enlarged with the shape of the shifting box 50. The bottom inner wall of the shell 63 is fixed with two oppositely distributed support frames 60 by bolts. One side of the two shells 63 is rotatably connected to the connecting shaft 31 through a bearing, and one end of the connecting shaft 31 is keyed to the driving gear 58. The bottom of the shell 63 is threadedly connected to the slag discharge cover 62. The shell 63 of the cleaning assembly 5 is provided with two sets of ultrasonic transducers 61 and the shell 6 3 is provided with an ultrasonic generator connected to the ultrasonic transducer 2 61, a heating wire 64 is provided in the housing 63 of the drying assembly 6 and on the inner wall of the avoidance chamber 57, the screening assembly 8 includes a screening box 70, the screening box 70 is fixed to the inside of the rear frame 7 by bolts, the inside of the screening box 70 is respectively hinged with a screening mesh plate 66 and a screening inclined plate 69 fixed by bolts, one side of the screening box 70 is respectively welded with an upper discharge hopper 67 and a lower discharge hopper 68 connected to the screening mesh plate 66 and the screening inclined plate 69, the other side of the screening box 70 is rotatably connected to a driven shaft 27 through a bearing, and the driven shaft One end of the shaft 27 is key-connected with a cam 65 that can contact the bottom of the screening mesh plate 66. The top inner wall of the rear frame 7 is located above the screening box 70 and is fixed with a rack frame 24 by bolts. When in use, by adding cleaning liquid into the cleaning component 5, the shifting component 10 is extended into the cleaning component 5. At this time, ultrasonic cleaning is performed by the ultrasonic transducer 2 61 and the ultrasonic generator, so that the debris on the broken plastic in the shifting component 10 is effectively removed, thereby effectively avoiding the subsequent melting of the plastic affecting the molding quality of the plastic. After the cleaning is completed, the cleaned plastic is moved by the shifting component 10. The plastic extends into the drying component 6, and then is effectively dried by the heating wire 64 provided in the drying component 6. The temperature needs to be controlled during drying to prevent the plastic from melting. After drying, the dried plastic is moved to the top of the screening component 8 by the shifting component 10, and the rack rack 24 cooperates with the shifting component 10 to cause the plastic in the shifting component 10 to dump. Then, the size of the crushed plastic is screened by the screening mesh plate 66 and the screening inclined plate 69, and discharged and classified from the upper discharge hopper 67 and the lower discharge hopper 68 respectively, so as to facilitate the subsequent melting operation of different degrees according to the different sizes of plastics.

[0055] In order to realize the problem of transferring plastics in the crushing component, the cleaning component, the drying component and the screening component so as to achieve a high degree of equipment integration, the shifting component 10 in the present invention includes a crossbeam 42, which is fixed between the two slides of the ball screw linear module 9 by bolts. The ball screw linear module 9 is composed of a screw, a motor, a threaded sleeve, two slides and a guide rail, and the screw is driven by the motor to rotate through the threaded sleeve to realize the movement of the slide along the guide rail. The interior of the crossbeam 42 is slidably connected to a slide 41, and the two ends of the slide 41 are rotatably connected to a fixed shaft 49 and a fixed shaft 49 respectively. A shift box 50 is welded between the fixed shaft 1 49 and the fixed shaft 2 53, and a plurality of drain grooves 51 are provided on the outer circumference of the shift box 50. A counterweight bar is fixed to the bottom outer wall of the shift box 50 by bolts. A torsion spring is sleeved on the outer circumference of the fixed shaft 1 49, and the two ends of the torsion spring are respectively fixed to the fixed shaft 1 49 and the slide 41. One end of the fixed shaft 1 49 is keyed to the driven gear 47. The top of the crossbeam 42 is fixed with a cylinder 40 by bolts, and one end of the piston rod of the cylinder 40 passes through the crossbeam 42 and is fixed to the slide 41. The cleaning component 5 and the drying component 6 The bottom of the crossbeam 42 is provided with a linkage mechanism for enabling the shifting box 50 to pre-dump water during the up and down movement. The shifting component 10 has four positions: position one: located below the positioning bucket 11, and realizes the loading operation; position two: located above the cleaning component 5, for cleaning operation; position three: located above the drying component 6, for drying operation; position four: located above the screening component 8, for unloading and screening operation. These four position states are switched by the ball screw linear module 9, and can be switched by starting the cylinder 40. The extension of the cylinder 40 drives the slide 41 and the transfer box 50 to move downward until the transfer box 50 moves to the cleaning component 5 or the drying component 6 and stops, and the cleaning and drying operations are performed. The positioning component 23 includes a sensing frame 37, and the sensing frame 37 is fixed to one side of the transfer component 10 by bolts. A plurality of photoelectric switch mounting frames 39 are fixed to one side of the rear frame 7 by bolts, and a slot-type photoelectric switch 38 is fixed to one side of the photoelectric switch mounting frame 39 by bolts. The plurality of slot-type photoelectric switches 38 correspond to the positioning bucket 11, the cleaning component 5, the drying component 6 and the screening component 8, respectively.

[0056] In order to effectively reduce the water on the shifting box and the internal plastic, and effectively improve the subsequent plastic drying efficiency, the linkage mechanism in the present invention includes a base 43, the base 43 is fixed to the bottom of the crossbeam 42 by bolts, the base 43 is internally slidably connected with a vertical plate 46, the bottom of the base 43 is slidably connected with a fixing rod 44 through a vertical sliding sleeve, one end of the fixing rod 44 is fixed to the vertical plate 46, the other end of the fixing rod 44 passes through the base 43 and is fixed with a tension spring 45 by bolts, and one end of the tension spring 45 is fixed to the base 43, one side of the vertical plate 46 is provided with three groups of tooth grooves 48, and the three groups of tooth grooves 48 are spaced a certain distance apart, the vertical plate 46 can contact with the rack 24 and be squeezed and moved, because when the shifting box 50 on the shifting assembly 10 is separated from the cleaning assembly 5, the shifting box 50 and the internal plastic will be attached with more water, affecting the subsequent drying efficiency, so a linkage mechanism is used to make the shifting box 50 swing and shake during the separation from the cleaning assembly 5, so that the shifting box 50 0 and the water on the internal plastic are thrown out to a certain extent, at this time, the water on the transfer box 50 and the internal plastic is effectively reduced, and the subsequent plastic drying efficiency is effectively improved. The cylinder 40 is shortened to drive the slide 41 and the transfer box 50 to move upward. At this time, the driven gear 47 is engaged with the group of tooth grooves 48 located at the bottom, so that the driven gear 47 rotates along the tooth grooves 48 and drives the transfer box 50 to rotate. When it moves to disengage from the group of tooth grooves 48 at the bottom, the transfer box 50 rotates in the opposite direction and resets under the dual action of the torsion spring and the counterweight bar, and the cylinder 40 continues to shorten, so that the driven gear 47 is engaged with the group of tooth grooves 48 located in the middle, and the above action is repeated until the cylinder 40 is shortened and reset to the initial state. At this time, the lowest tooth of the group of tooth grooves 48 located at the top is engaged with the driven gear 47. At this time, the transfer box 50 is in the initial state and the opening is vertically upward, thereby realizing the swinging and water shaking action of the transfer box 50 during the separation from the cleaning component 5.

[0057] The driving assembly of the present invention includes a driving motor 30, which is fixed to the outer wall of one side of the rear frame 7 by bolts. One end of the output shaft of the driving motor 30 is keyed to the active synchronous pulley 29. The other ends of the connecting shafts 31 of the cleaning assembly 5 and the drying assembly 6 are fixed to a force arm 32 by bolts. A slide groove 33 is provided inside the force arm 32. The bottom inner wall of the rear frame 7 is rotatably connected to two driven shafts 35 by bearings. One end of the two driven shafts 35 is fixed to a rocker arm 34 by bolts, and the rocker arm 34 can move along the The slide groove 33 moves up and down, one side of the two driven shafts 2 35 and the other end of the driven shaft 1 27 are key-connected with driven synchronous pulleys 26, and multiple driven synchronous pulleys 26 are connected to the active synchronous pulley 29 through a synchronous belt transmission. The bottom inner wall of the rear frame 7 is rotatably connected with a pressure roller 36 for pressing down and positioning the synchronous belt. Since the pressure roller 36 presses down the synchronous belt, the synchronous belt is meshed with multiple driven synchronous pulleys 26 and the active synchronous pulley 29. When the fixed shaft 1 49 and the fixed shaft 2 of the shift box 50 are moved, the synchronous belt is engaged with the multiple driven synchronous pulleys 26 and the active synchronous pulley 29. When the gear 53 moves to contact and support with the two support frames 60, the driven gear 47 is meshed with the driving gear 58, and then the driving motor 30 is started, the driving motor 30 rotates to drive the driving synchronous pulley 29 to rotate, the driving synchronous pulley 29 rotates to drive multiple driven synchronous pulleys 26 to rotate through the synchronous belt, and the driven synchronous pulley 26 rotates to make the driven shaft 2 35 drive the rocker arm 34 to rotate, and the rocker arm 34 rotates and cooperates with the slide groove 33 provided in the force arm 32, so as to realize the left and right swing of the force arm 32. The driving gear 58 drives the driven gear 47 to swing through the connecting shaft 31, thereby realizing the left and right swing of the shifting box 50. Therefore, not only can the cleaning be more thorough during the cleaning operation, but also the plastic can be vibrated and dried more thoroughly during the drying operation. At the same time, the driven synchronous pulley 26 rotates through the driven shaft 27 to drive the cam 65 to rotate. The cam 65 intermittently lifts the screening mesh plate 66, thereby realizing the continuous vibration of the screening mesh plate 66 and effectively avoiding the blockage of the screening hole slots of the screening mesh plate 66.

[0058] The second fixed shaft 53 of the present invention is connected with a push rod 55 through a keyway and a key strip, and one end of the push rod 55 is fixed with a push frame 52 by bolts, and the push frame 52 contacts the inner wall of the shift box 50, and the other end of the push rod 55 is fixed with a dislocation plate 54 by bolts, and a spring 56 is fixed to one side of the dislocation plate 54 by bolts, and one end of the spring 56 is fixed to the end of the fixed shaft 53, and an extrusion ball 59 is fixed to the inner wall of the shell 63 of the cleaning component 5 and the drying component 6 by bolts. The dislocation plate 54 is squeezed by the extrusion ball 59, so that the dislocation plate 54 drives the push frame 52 to move inward through the push rod 55. At this time, when the shift box 50 rotates, the fixed shaft 2 53 drives the push rod 55 and the dislocation plate 54 to rotate through the keyway and the key strip, and under the elastic force of the spring 56, the left and right movement of the push frame 52 is realized, and the plastic in the shift box 50 is effectively moved by the push frame 52, so as to further improve the cleaning and drying speed.

[0059] In order to solve the problem that harder materials such as iron castings and stones are easily mixed into plastics, which may cause irreversible damage to the crushing blades, the sorting component 4 in the present invention includes a brine box 13, which is fixed to the top of the front frame 3 by bolts. The brine box 13 is an arc-shaped structure that is narrow on the left and wide on the right. A deflector 15 is fixed to the top of the wider end of the brine box 13 by bolts. A connecting air pipe 16 is connected to one side of the deflector 15. Two groups of ultrasonic transducers 14 are provided at the bottom of the brine box 13. An ultrasonic generator connected to the ultrasonic transducer 14 is provided inside the front frame 3. When plastic is crushed, harder materials such as iron castings and stones are easily mixed into the plastics, which may cause irreversible damage to the crushing blades. Therefore, it is necessary to pre-sort the plastic parts. First, brine is injected into the brine box 13. At this time, the brine is passed through the brine box 13. The plastic to be processed is poured into the brine in the brine tank 13. Since the density of most plastics is lower than that of water, most plastics can float in the water. When the salt content in the water increases, that is, in the brine, the density of water will increase, and the density of brine is higher than that of pure water. Therefore, the brine can provide greater buoyancy, thereby realizing the separation of plastic parts, iron castings, stones, etc., and connecting with the external air pipe through the connecting air pipe 16, and realizing the blowing action of the guide cover 15 through the external air pipe. Due to the arc-shaped blowing structure of the guide cover 15, the floating plastic in the brine tank 13 is gathered to the narrower end of the brine tank 13, and then lifted and transported to the top of the crushing component 1 by the chain plate elevator 2, and crushed by the crushing component 1, and the preliminary cleaning of the plastic can be realized by the ultrasonic transducer 14 and the ultrasonic generator.

[0060] In order to achieve rapid crushing of plastic, the crushing assembly 1 in the present invention includes a crushing box 21, in which a rotating frame 18 is rotatably connected through a bearing, and multiple groups of rotating knife frames 17 are fixed to the outer circumference of the rotating frame 18 by bolts. A fixed knife frame 20 that cooperates with the rotating knife frame 17 is fixed to the inside of the crushing box 21 by bolts, and a cover plate 19 is fixed to the bottom of the crushing box 21 by bolts. A crushing motor 22 is fixed to the outer wall of one side of the crushing box 21 by bolts, and one end of the output shaft of the crushing motor 22 is fixed to the end of the rotating frame 18 through a coupling. By starting the crushing motor 22, the crushing motor 22 rotates to make the rotating frame 18 drive the rotating knife frame 17 to rotate rapidly, and the crushing operation of the plastic inside is achieved through the cooperation of the rotating knife frame 17 and the fixed knife frame 20. After the crushing is completed, the plastic is lifted and transported to the positioning bucket 11 by the chain plate elevator 2 12, and subsequent processing operations are carried out.

[0061] A method for batch pretreatment of recycled plastics, comprising the following steps:

[0062] S1: When crushing plastics, it is easy for the plastics to be mixed with harder materials such as iron castings and stones, which will cause irreversible damage to the crushing blades. Therefore, it is necessary to pre-sort the plastic parts. First, inject salt water into the salt water box 13. At this time, the plastics to be processed are poured into the salt water in the salt water box 13. Since the density of most plastics is lower than that of water, most plastics can float in the water. When the salt content in the water increases, that is, in the salt water, the density of the water will increase. The density of the salt water is higher than that of pure water. Therefore, the salt water can provide greater buoyancy, thereby realizing the separation of plastic parts, iron castings, stones, etc., and at the same time, the preliminary cleaning of the plastics can be realized through the ultrasonic transducer 14 and the ultrasonic generator;

[0063] S2: Then the air pipe 16 is connected to the external air pipe, and the air guide cover 15 is blown through the external air pipe. Due to the arc-shaped blowing structure of the air guide cover 15, the plastic floating in the salt water box 13 is gathered to the narrow end of the salt water box 13, and then the plastic is lifted and transported to the inside of the crushing assembly 1 by the chain plate elevator 2;

[0064] S3: Then the crushing motor 22 is started, and the crushing motor 22 rotates so that the rotating frame 18 drives the rotating knife frame 17 to rotate rapidly, and the plastic inside is crushed by the cooperation of the rotating knife frame 17 and the fixed knife frame 20. After the crushing, the plastic is lifted and transported to the positioning bucket 11 by the chain plate elevator 12;

[0065] S4: At this time, the transfer assembly 10 is in position 1, and the loading operation from the positioning bucket 11 to the transfer box 50 in the transfer assembly 10 is realized;

[0066] S5: Then the ball screw linear module 9 is used to switch the shifting assembly 10 to position two, and then the cylinder 40 is started, the cylinder 40 is extended to drive the slide 41 and the shifting box 50 to move downward, when the fixed shaft 1 49 and the fixed shaft 2 53 of the shifting box 50 move to contact and support with the two support frames 60, the driven gear 47 is meshed with the driving gear 58, and then the driving motor 30 is started, the driving motor 30 rotates to drive the driving synchronous pulley 29 to rotate, the driving synchronous pulley 29 rotates and drives multiple driven synchronous pulleys 26 to rotate through the synchronous belt, the driven synchronous pulley 26 rotates to drive the driven shaft 2 35 to drive the rocker arm 34 to rotate, the rocker arm 34 rotates and cooperates with the slide groove 33 opened in the force arm 32, so as to realize the left and right swing of the force arm 32, and the left and right swing of the force arm 32 is achieved through The connecting shaft 31 causes the driving gear 58 to drive the driven gear 47 to swing, thereby realizing the left and right swing of the shifting box 50, and ultrasonic cleaning is performed through the ultrasonic transducer 2 61 and the ultrasonic generator, so that the debris and the like on the broken plastic in the shifting component 10 are effectively removed, thereby effectively avoiding the subsequent melting of the plastic affecting the molding quality of the plastic, and the dislocation plate 54 is squeezed by the squeezing ball 59, so that the dislocation plate 54 drives the push frame 52 to move inward through the push rod 55. At this time, when the shifting box 50 rotates, the fixed shaft 2 53 drives the push rod 55 and the dislocation plate 54 to rotate through the key slot and the key bar, and under the elastic force of the spring 56, the push frame 52 is moved left and right, and the plastic in the shifting box 50 is effectively moved through the push frame 52, further improving the cleaning rate;

[0067] S6: After the cleaning is completed, the cylinder 40 is shortened to drive the slide 41 and the transfer box 50 to move upward. At this time, the driven gear 47 is meshed with the group of tooth grooves 48 located at the bottom, so that the driven gear 47 rotates along the tooth grooves 48 and drives the transfer box 50 to rotate. When it moves to the point where it is disengaged from the group of tooth grooves 48 located at the bottom, the transfer box 50 rotates in the opposite direction and resets under the dual action of the torsion spring and the counterweight bar, and the cylinder 40 continues to shorten, so that the driven gear 47 is meshed with the group of tooth grooves 48 located in the middle, and the above action is repeated until the cylinder 40 is shortened and reset to the initial state. At this time, the lowest teeth of the group of tooth grooves 48 located at the top are meshed with the driven gear 47. At this time, the transfer box 50 is in the initial state with the opening vertically upward, so that the transfer box 50 can swing and shake water during the process of being separated from the cleaning component 5. At this time, the water on the transfer box 50 and the internal plastic is effectively reduced, and the subsequent plastic drying efficiency is effectively improved;

[0068] S7: Then the ball screw linear module 9 is used to switch the moving assembly 10 to position three, and the above actions are repeated, so that the moving box 50 is extended into the drying assembly 6, and then the heating wire 64 provided in the drying assembly 6 is used for effective drying, and the temperature needs to be controlled during drying to prevent the plastic from melting;

[0069] S8: After the drying is completed, the cylinder 40 is shortened to drive the slide 41 and the shifting box 50 to move upward and reset, and then the ball screw linear module 9 is used to switch the shifting assembly 10 to position four. During this process, the rack frame 24 contacts and squeezes the vertical plate 46, so that the vertical plate 46 moves backward through the fixed rod 44. At this time, the driven gear 47 is disengaged from the tooth groove 48 on the vertical plate 46, and then the rack frame 24 is engaged with the driven gear 47, and the driven gear 47 is rotated along the rack frame 24, so that the shifting box 50 is turned over and dumped, and the plastic blocks inside are dumped into the screening assembly 8;

[0070] S9: The size of the crushed plastic is then screened through the screening mesh plate 66 and the screening inclined plate 69, and discharged and classified from the upper discharge hopper 67 and the lower discharge hopper 68 respectively, so as to facilitate the subsequent melting operation of different degrees according to the different sizes of plastics, and the driven synchronous pulley 26 rotates to drive the cam 65 to rotate through the driven shaft 27, and the cam 65 intermittently lifts the screening mesh plate 66, thereby realizing the continuous vibration of the screening mesh plate 66, and effectively avoiding the blockage of the screening hole slots of the screening mesh plate 66.

[0071] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0072] In the description of this article, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A recycled plastic batch pretreatment device, comprising a front frame (3) and a rear frame (7), characterized in that: The top of the front frame (3) is provided with a sorting component (4) for preliminary processing of the plastics and a crushing component (1) for crushing the plastics after sorting. The top of the front frame (3) and located between the sorting component (4) and the crushing component (1) is provided with a chain plate elevator (2) for conveying the plastics. The interior of the rear frame (7) is provided with a cleaning component (5) for secondary cleaning of the crushed plastics, a drying component (6) for drying the cleaned plastics, and a screening component (8) for classifying the crushed plastic pieces of different sizes. The cleaning component (5), the drying component (6) and the screening component (8) are provided to separate the plastic pieces into smaller and larger pieces. The drying component (6) and the screening component (8) are arranged in sequence, the top of the rear frame (7) is provided with a shifting component (10) for transferring the crushed plastic to different workstations through a ball screw linear module (9), and a positioning component (23) for accurately positioning the position of the crushed plastic is provided between the rear frame (7) and the shifting component (10), the top of the rear frame (7) is fixedly connected with a positioning bucket (11), and the top of the front frame (3) and located between the crushing component (1) and the positioning bucket (11) is provided with a chain plate elevator (12) for conveying the crushed plastic of the crushing component (1); The cleaning component (5) and the drying component (6) both comprise a shell (63), and the two shells (63) are both fixedly connected to the interior of the rear frame (7). The shell (63) is provided with a avoidance chamber (57) in the middle position, which is proportionally enlarged to the shape of the shifting box (50). The bottom inner wall of the shell (63) is fixedly connected to two support frames (60) arranged opposite to each other. One side of the two shells (63) is rotatably connected to a connecting shaft (31) via a bearing, and one end of the connecting shaft (31) is fixedly connected to a driving gear (58). The bottom of the shell (63) is threadedly connected to a slag discharge cover (62). Two sets of ultrasonic transducers (61) are provided in the shell (63) of the cleaning component (5), and an ultrasonic generator connected to the ultrasonic transducer (61) is provided below the shell (63). The shell (63) of the drying component (6) is provided with a plurality of ultrasonic transducers (61). A heating wire (64) is provided on the inner wall of the body (63) and located in the avoidance chamber (57); the screening assembly (8) comprises a screening box (70), the screening box (70) is fixedly connected to the inside of the rear frame (7); a screening mesh plate (66) and a screening inclined plate (69) are respectively hingedly connected to the inside of the screening box (70); an upper discharge hopper (67) and a lower discharge hopper (68) which are connected to the screening mesh plate (66) and the screening inclined plate (69) are respectively welded on one side of the screening box (70); a driven shaft (27) is rotatably connected to the other side of the screening box (70) via a bearing; one end of the driven shaft (27) is fixedly connected to a cam (65) which can contact the bottom of the screening mesh plate (66); a rack rack (24) is fixedly connected to the top inner wall of the rear frame (7) and located above the screening box (70); The shifting assembly (10) comprises a crossbeam (42), the crossbeam (42) being fixedly connected between two slides of a ball screw linear module (9), the interior of the crossbeam (42) being slidably connected to a slide frame (41), the two ends of the slide frame (41) being rotatably connected to a fixed shaft 1 (49) and a fixed shaft 2 (53), a shifting box (50) being welded between the fixed shaft 1 (49) and the fixed shaft 2 (53), a plurality of drain grooves (51) being provided on the outer circumference of the shifting box (50), a counterweight bar being fixedly connected to the bottom outer wall of the shifting box (50), the fixed shaft 1 (49) and the fixed shaft 2 (53) being rotatably connected to the slide frame (41), A torsion spring is sleeved on the outer side of the circle, and the two ends of the torsion spring are respectively fixed to the fixed shaft (49) and the slide (41); one end of the fixed shaft (49) is fixedly connected to a driven gear (47); the top of the crossbeam (42) is fixedly connected to a cylinder (40), and one end of a piston rod of the cylinder (40) passes through the crossbeam (42) and is fixed to the slide (41); the cleaning component (5), the drying component (6) and the screening component (8) are all provided with a driving component; and the bottom of the crossbeam (42) is provided with a linkage mechanism for enabling the shifting box (50) to pre-drain water during the upward and downward movement.

2. A recycled plastic batch pretreatment device according to claim 1, characterized in that: The linkage mechanism comprises a card seat (43), the card seat (43) is fixedly connected to the bottom of the cross beam (42), the card seat (43) is slidably connected to a vertical plate (46) inside, the card seat (43) is slidably connected to a fixing rod (44) at the bottom through a vertical sliding sleeve, one end of the fixing rod (44) is fixed to the vertical plate (46), the other end of the fixing rod (44) passes through the card seat (43) and is fixedly connected to a tension spring (45), and one end of the tension spring (45) is fixed to the card seat (43), one side of the vertical plate (46) is provided with three groups of tooth grooves (48), and the three groups of tooth grooves (48) are spaced a certain distance apart, the lowest teeth of the group of tooth grooves (48) located at the top are meshed with the driven gear (47), at this time, the shifting box (50) is in an initial state with the opening vertically upward, and the vertical plate (46) can contact with the rack frame (24) and be squeezed and moved.

3. A recycled plastic batch pretreatment device according to claim 2, characterized in that: The driving assembly comprises a driving motor (30), the driving motor (30) being fixedly connected to an outer wall of one side of the rear frame (7), one end of the output shaft of the driving motor (30) being fixedly connected to a driving synchronous pulley (29), the other ends of the connecting shafts (31) of the cleaning assembly (5) and the drying assembly (6) being fixedly connected to a force arm (32), a slide groove (33) being provided inside the force arm (32), and the bottom inner wall of the rear frame (7) being rotatably connected to two driven shafts (35) via bearings. One end of each of the two driven shafts (35) is fixedly connected to a rocker arm (34), and the rocker arm (34) can move up and down along the slide groove (33); one side of each of the two driven shafts (35) and the other end of the driven shaft (27) are fixedly connected to a driven synchronous pulley (26), and a plurality of driven synchronous pulleys (26) are connected to the driving synchronous pulley (29) through a synchronous belt transmission; and a pressure roller (36) for pressing down and positioning the synchronous belt is rotatably connected to the bottom inner wall of the rear frame (7).

4. A recycled plastic batch pretreatment device according to claim 3, characterized in that: The interior of the second fixed shaft (53) is connected to a push rod (55) via a keyway and a key bar, one end of the push rod (55) is fixedly connected to a push frame (52), and the push frame (52) contacts the inner wall of the shifting box (50), the other end of the push rod (55) is fixedly connected to a dislocation plate (54), one side of the dislocation plate (54) is fixedly connected to a spring (56), and one end of the spring (56) is fixed to the end of the second fixed shaft (53), and one side inner wall of the shell (63) of the cleaning component (5) and the drying component (6) is fixedly connected to a squeezing ball (59).

5. A recycled plastic batch pretreatment device according to claim 4, characterized in that: The positioning assembly (23) comprises a sensing frame (37), the sensing frame (37) being fixedly connected to one side of the shifting assembly (10), a plurality of photoelectric switch mounting frames (39) being fixedly connected to one side of the rear frame (7), a slot-type photoelectric switch (38) being fixedly connected to one side of the photoelectric switch mounting frames (39), and the plurality of slot-type photoelectric switches (38) respectively corresponding to the positioning bucket (11), the cleaning assembly (5), the drying assembly (6) and the screening assembly (8).

6. A recycled plastic batch pretreatment device according to claim 5, characterized in that: The sorting assembly (4) comprises a brine box (13), the brine box (13) being fixedly connected to the top of the front frame (3), the brine box (13) being an arc-shaped structure narrow on the left and wide on the right, a flow guide cover (15) being fixedly connected to the top of the wider end of the brine box (13), a connecting air pipe (16) being connected to one side of the flow guide cover (15), two groups of ultrasonic transducers (14) being provided at the bottom of the brine box (13), and an ultrasonic generator connected to the ultrasonic transducer (14) being provided inside the front frame (3).

7. A recycled plastic batch pretreatment device according to claim 6, characterized in that: The crushing assembly (1) comprises a crushing box (21), a rotating frame (18) is rotatably connected to the crushing box (21) via a bearing, a plurality of groups of rotating knife frames (17) are fixedly connected to the outer circumference of the rotating frame (18), a fixed knife frame (20) matched with the rotating knife frame (17) is fixedly connected to the inside of the crushing box (21), a cover plate (19) is fixedly connected to the bottom of the crushing box (21), a crushing motor (22) is fixedly connected to the outer wall of one side of the crushing box (21), and one end of the output shaft of the crushing motor (22) is fixed to the end of the rotating frame (18) via a coupling.

8. A method for batch pretreatment of recycled plastics, applicable to a batch pretreatment device for recycled plastics as claimed in any one of claims 1 to 7, characterized in that: It includes the following steps: S1: When crushing plastics, it is easy for the plastics to be mixed with harder materials such as iron castings and stones. Such materials will cause irreversible damage to the crushing blades. Therefore, it is necessary to pre-sort the plastic parts. First, salt water is injected into the salt water box (13). At this time, the plastics to be processed are poured into the salt water in the salt water box (13). Since the density of most plastics is lower than that of water, most plastics can float in the water. When the salt content in the water increases, that is, in the salt water, the density of the water increases. The density of the salt water is higher than that of pure water. Therefore, the salt water can provide greater buoyancy, thereby achieving separation of plastic parts, iron castings, and stones. At the same time, the ultrasonic transducer 1 (14) and the ultrasonic generator can achieve preliminary cleaning of the plastics. S2: Then, the connecting air pipe (16) is connected to the external air pipe, and the air blowing action of the air guide cover (15) is realized through the external air pipe. Due to the arc-shaped air blowing structure of the air guide cover (15), the plastic floating in the salt water box (13) is gathered to the narrow end of the salt water box (13), and then the plastic is lifted and transported to the inside of the crushing assembly (1) by the chain plate elevator (2); S3: Then the crushing motor (22) is started, and the crushing motor (22) rotates so that the rotating frame (18) drives the rotating knife frame (17) to rotate rapidly, and the plastic inside is crushed by the cooperation of the rotating knife frame (17) and the fixed knife frame (20). After the crushing, the plastic is lifted and transported to the positioning bucket (11) by the chain plate type elevator 2 (12); S4: At this time, the transfer assembly (10) is in position one, and a loading operation is performed from the positioning bucket (11) to the transfer box (50) in the transfer assembly (10); S5: Then, the ball screw linear module (9) is used to switch the shifting assembly (10) to position 2, and then the cylinder (40) is started, and the cylinder (40) is extended to drive the slide (41) and the shifting box (50) to move downward. When the fixed shaft 1 (49) and the fixed shaft 2 (53) of the shifting box (50) move to contact and support the two support frames (60), the driven gear (47) is meshed with the driving gear (58), and then the driving motor (30) is started, and the driving motor (30) rotates to drive the driving synchronous pulley (29) to rotate. The driving synchronous pulley (29) rotates through the synchronous belt to drive multiple driven synchronous pulleys (26) to rotate. The driven synchronous pulley (26) rotates to drive the driven shaft 2 (35) to drive the rocker arm (34) to rotate. The rocker arm (34) rotates and cooperates with the slide groove (33) provided in the force arm (32), thereby realizing the left and right swing of the force arm (32). The left-right swinging causes the driving gear (58) to drive the driven gear (47) to swing through the connecting shaft (31), thereby realizing the left-right swinging of the shifting box (50), and ultrasonic cleaning is performed through the second ultrasonic transducer (61) and the ultrasonic generator, so that the debris on the crushed plastic in the shifting component (10) is effectively removed, thereby effectively avoiding the subsequent melting of the plastic affecting the molding quality of the plastic, and the squeezing ball (59) squeezes the dislocation plate (54), so that the dislocation plate (54) drives the push frame (52) to move inward through the push rod (55). At this time, when the shifting box (50) rotates, the second fixed shaft (53) drives the push rod (55) and the dislocation plate (54) to rotate through the keyway and the key bar, and under the elastic force of the spring (56), the push frame (52) is moved left-right, and the plastic in the shifting box (50) is effectively moved through the push frame (52), further improving the cleaning rate; S6: After the cleaning is completed, the cylinder (40) is shortened to drive the carriage (41) and the shifting box (50) to move upward. At this time, the driven gear (47) is meshed with the lowest set of tooth grooves (48), so that the driven gear (47) rotates along the tooth grooves (48) and drives the shifting box (50) to rotate. When it moves to the point where it is disengaged from the lowest set of tooth grooves (48), the shifting box (50) rotates in the opposite direction and resets under the dual action of the torsion spring and the counterweight bar, and the cylinder (40) continues to shorten, so that the driven gear (47) is rotated along the tooth grooves (48). 47) meshes with a group of tooth grooves (48) located in the middle, and the above-mentioned action is repeated until the cylinder (40) is shortened and reset to the initial state, at which time the lowest tooth of the group of tooth grooves (48) located at the top meshes with the driven gear (47), and the shifting box (50) is in the initial state with the opening vertically upward, so that the shifting box (50) can be shaken and shaken during the process of being separated from the cleaning component (5), thereby effectively reducing the water on the shifting box (50) and the plastic inside, and effectively improving the subsequent plastic drying efficiency; S7: Then, the ball screw linear module (9) is used to switch the shifting assembly (10) to position three, and the above-mentioned action is repeated, so that the shifting box (50) is extended into the drying assembly (6), and then the heating wire (64) provided in the drying assembly (6) is used to effectively dry the plastic. During the drying process, the temperature must be controlled to prevent the plastic from melting. S8: After the drying is completed, the cylinder (40) is shortened to drive the slide (41) and the shifting box (50) to move upward and reset, and then the ball screw linear module (9) is used to switch the shifting assembly (10) to position four. During this process, the rack frame (24) contacts and squeezes the vertical plate (46), so that the vertical plate (46) moves backward through the fixed rod (44). At this time, the driven gear (47) is disengaged from the tooth groove (48) on the vertical plate (46), and then the rack frame (24) is engaged with the driven gear (47), and the driven gear (47) is rotated along the rack frame (24), so that the shifting box (50) is turned over and dumped, and the plastic blocks inside are dumped into the screening assembly (8); S9: The crushed plastics are then screened by the screening mesh plate (66) and the screening inclined plate (69), and are discharged and classified from the upper discharge hopper (67) and the lower discharge hopper (68) respectively, so as to facilitate subsequent melting operations of different degrees according to the plastics of different sizes. The driven synchronous pulley (26) rotates through the driven shaft 1 (27) to drive the cam (65) to rotate, and the cam (65) intermittently lifts the screening mesh plate (66), thereby achieving continuous vibration of the screening mesh plate (66), effectively avoiding the blocking of the screening holes of the screening mesh plate (66).

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