A premixing device for recycling plastics for use in the processing of food wrap

Abstract

The present invention relates to the technical field of fresh-keeping film production, and specifically relates to a premixing device for recycling plastics for fresh-keeping film processing, including a housing; an inner shell is vertically arranged inside the housing, the inner shell is of a tubular structure, a first cavity is formed inside the inner shell, and a second cavity exists between the outer peripheral wall of the inner shell and the inner wall of the housing. The second cavity is of an annular structure, the first cavity and the second cavity are communicated with each other, and the communication part between the second cavity and the first cavity is located below the inner shell. A crushing unit for crushing recycled plastics is arranged in the first cavity. Drainage holes are uniformly formed at the bottom of the second cavity. A screening unit is arranged in the second cavity. The screening unit includes a blocking ring fixedly arranged in the second cavity. A screening groove is vertically penetrated through the blocking ring. A first fan is arranged directly below the screening groove. The present invention combines the drying and premixing and crushing steps, and simultaneously improves the refinement degree of the recycled plastics after premixing.

Description

Technical Field

[0001] The invention relates to the technical field of fresh-keeping film production, in particular to premixing equipment for recycling plastics for fresh-keeping film processing. Background Art

[0002] Existing raw material premixing devices for cling film production suffer from low efficiency. During the premixing process, the raw materials for cling film are difficult to crush and refine, resulting in large particles that affect subsequent cling film processing. Furthermore, conventional raw material premixing devices for cling film production are inconvenient to remove, and after the premixing process is complete, residual raw materials are prone to occur during the discharge phase, preventing the raw materials from being completely discharged and thus impacting subsequent premixing operations.

[0003] Chinese patent CN219583299U discloses a raw material premixing device for the production of forage cling film, including a casing, a fixed column fixedly connected to the top of the casing, one end of the fixed column fixedly connected to a motor, the output shaft of the motor fixedly connected to a rotating shaft through a coupling, the outer wall of the rotating shaft fixedly connected to a connecting block, one side of the connecting block fixedly connected to a stirring rod, the outer wall of the rotating shaft is provided with threaded blades, and one side of the casing is fixedly connected to a feed plate.

[0004] The above scheme enables the raw materials to be more refined during stirring. With the increasing awareness of environmental protection, the process of making plastic wrap using recycled plastics also has high prospects. However, there are problems such as a large number of impurities in the recycled plastics. They need to be thoroughly cleaned before premixing. The entire mixing process requires four steps: cleaning, drying, premixing, crushing and mixing. This results in more processing steps, and each step requires the use of separate equipment for processing. It also consumes a lot of time when transporting between different equipment. In addition, the existing premixing and crushing requires sufficient time to crush the recycled plastic to achieve the refining effect, and the premixing time is long. Summary of the Invention

[0005] In response to the above problems, a premixing device for recycled plastic for cling film processing is provided. An inner shell is arranged in an outer shell to form a first cavity and a second cavity. A crushing unit is arranged in the first cavity, and a sealing ring is arranged in the second cavity to seal the upper part of the second cavity. The recycled plastic entering the first cavity is first crushed by the crushing unit. The crushing unit can crush the recycled plastic and also preliminarily mix the recycled plastic. At the same time, the drainage hole at the bottom of the second cavity can discharge the moisture in the recycled plastic. The first fan heats the air through the heating wire and further heats the recycled plastic in the second cavity, so that the premixing and drying can be completed in the same step.

[0006] To solve the problems of the existing technology, the present invention provides a premixing device for recycling plastics for processing fresh-keeping films, including a housing, which is in a cylindrical structure; an inner housing is vertically arranged inside the housing, and the inner housing is in a tubular structure. A first cavity is formed inside the inner housing, and a second cavity is provided between the outer peripheral wall of the inner housing and the inner wall of the housing. The second cavity is in an annular structure. The first cavity and the second cavity are interconnected, and the connection between the second cavity and the first cavity is located below the inner housing. A crushing unit for crushing recycled plastics is arranged in the first cavity. Drainage holes are evenly formed at the bottom of the second cavity. A screening unit is arranged in the second cavity. The screening unit includes a blocking ring fixedly arranged in the second cavity. A screening slot is vertically penetrated through the blocking ring. A first fan is arranged directly below the screening slot. The first fan is arranged at the bottom of the housing. When the first fan operates, the outside air flows upward in the vertical direction. The recycled plastics after being cleaned enter the second cavity after being crushed in the first cavity and enter the screening slot under the action of the upward flowing air generated by the first fan.

[0007] Preferably, a first filter screen is arranged above the first fan. The upper end surface of the first filter screen is coplanar with the upper end surface of the second cavity. A heating wire is arranged between the first filter screen and the first fan. When the first fan is started, the heating wire is synchronously powered on for heating.

[0008] Preferably, a scraping plate is rotatably arranged at the bottom of the second cavity around the axis of the housing. The bottom of the scraping plate is in contact with and slidably matched with the bottom of the second cavity. The sweeping area formed when the scraping plate rotates completely covers the bottom of the second cavity.

[0009] Preferably, a return flow groove is also formed at the bottom of the second cavity. The return flow groove is in an inclined structure and extends downward from the second cavity along the radial direction of the housing to the first cavity. A lifting unit is arranged vertically on the first cavity. The return flow groove is communicated with the lifting unit. The return flow groove is used for storing recycled plastics that cannot be blown up by the first fan. The lifting unit is used for lifting the recycled plastics stored in the return flow groove to the upper part of the first cavity and re-injecting them into the first cavity.

[0010] Preferably, the lifting unit includes a lifting sleeve fixedly arranged vertically at the bottom of the first cavity. The lifting sleeve is communicated with the return flow groove. The lifting sleeve is in a tubular structure. The axis of the lifting sleeve is collinear with the axis of the housing. A spiral blade is rotatably arranged in the lifting sleeve along the axis of the lifting sleeve. The spiral blade extends to the bottom of the return flow groove. A driving unit is arranged at the bottom of the return flow groove for driving the spiral blade to rotate.

[0011] Preferably, the driving unit includes a first gear fixedly arranged at the lower end of the spiral blade. A second gear is meshed with one side of the first gear. A rotary driver for driving the second gear to rotate is arranged at the lower end of the second gear. The rotary driver is fixedly arranged at the bottom of the housing.

[0012] Preferably, a second filter screen is fixedly arranged at the bottom of the reflux tank along the extending direction of the reflux tank, a second blower is horizontally arranged below the second filter screen, and the air flow blown out by the second blower flows from the second cavity towards the first cavity side along the radial direction of the outer shell.

[0013] Preferably, the crushing unit includes a crushing sleeve vertically arranged in the first cavity. The axis of the crushing sleeve is collinear with the axis of the outer shell. The crushing sleeve rotates around its own axis. A plurality of blades are evenly arranged on the side wall of the crushing sleeve. A transmission assembly is arranged between the crushing sleeve and the driving unit, and the driving unit drives the crushing sleeve to rotate through the transmission assembly.

[0014] Preferably, the transmission assembly includes a connecting shaft vertically penetrating through the bottom of the outer shell. The connecting shaft is fixedly arranged at the upper end of the second gear. A third gear is fixedly arranged at the upper end of the connecting shaft. A toothed ring is meshed on one side of the third gear. The axis of the toothed ring is collinear with the axis of the outer shell. The bottom of the crushing sleeve is fixedly arranged at the upper end of the toothed ring.

[0015] Preferably, a connecting frame is fixedly arranged at the lower end of the first gear. The connecting frame extends from the inside to the outside along the radial direction of the outer shell. A third blower is fixedly arranged at the end of the connecting frame far away from the first gear. The third blower generates an air flow vertically from bottom to top.

[0016] The beneficial effects of the present invention compared with the prior art are as follows:

[0017] 1. By arranging an inner shell in the outer shell to form a first cavity and a second cavity, a crushing unit is arranged in the first cavity, and at the same time, a plugging ring is arranged in the second cavity to plug the upper part of the second cavity. The recycled plastic entering the first cavity is first crushed by the crushing unit. The crushing unit can not only crush the recycled plastic but also preliminarily mix the recycled plastic. The crushed recycled plastic falls to the bottom of the second cavity. The moisture in the recycled plastic is discharged through the drain holes at the bottom of the second cavity. Then, the scraping plate pushes the recycled plastic located at the bottom of the second cavity. The recycled plastic is blown up by the air blown out by the first blower when passing below the screening trough. The air blown out by the first blower can also dry the recycled plastic after being heated by the heating wire. In this way, the recycled plastic can be dried while being premixed, improving the production efficiency. At the same time, the first blower screens the crushed recycled plastic, so that the qualified recycled plastic particles can be discharged through the screening trough in time, avoiding the drawback that the crushing unit must operate for a rated time to discharge the recycled plastic.

[0018] 2. By providing a reflux groove at the bottom of the second cavity that extends into the first cavity, a lifting unit is provided on the first cavity, such that the lifting sleeve in the lifting unit communicates with the reflux groove, ensuring that the recycled plastics that do not meet the standards can enter the lifting sleeve through the reflux groove for re-lifting and are re-fed into the first cavity for secondary crushing. While the crushing unit crushes the recycled plastics re-fed, it can also perform pre-mixing.

[0019] 3. A connecting frame is provided on the first gear, and a third blower is provided at the end of the connecting frame. When the rotary drive is started, the crushing unit and the connecting frame rotate simultaneously. The connecting frame rotates synchronously with the first gear, and the connecting frame drives the third blower to rotate around the axis of the housing. Since the third blower can generate an upward airflow. Thus, during the rotation of the third blower, the airflow blown by the third blower can pass through the drain holes from bottom to top and enter the second cavity, thereby realizing self-cleaning of the drain holes. And since the third blower rotates around the axis of the housing, when the third blower cleans the drain holes on the second cavity, it will not affect the overall drainage effect of the drain holes, achieving the effect of self-cleaning the drain holes without affecting the normal drainage function. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective schematic view of a premixing device for recycled plastics used in the processing of plastic wrap according to the present invention Figure 1 .

[0021] Figure 2 is a perspective schematic view of a premixing device for recycled plastics used in the processing of plastic wrap according to the present invention Figure 2 .

[0022] Figure 3 is a premixing device for recycled plastics used in the processing of plastic wrap according to the present invention Figure 2 partial enlarged schematic view at A in

[0023] Figure 4 is a cutaway perspective schematic view of a premixing device for recycled plastics used in the processing of plastic wrap according to the present invention Figure 1 .

[0024] Figure 5 is a premixing device for recycled plastics used in the processing of plastic wrap according to the present invention Figure 4 partial enlarged schematic view at B in

[0025] Figure 6 is a side view of a premixing device for recycled plastics used in the processing of plastic wrap according to the present invention

[0026] Figure 7 is a premixing device for recycled plastics used in the processing of plastic wrap according to the present invention Figure 6 cross-sectional schematic view taken along line C-C in

[0027] Figure 8 It is a sectional three-dimensional schematic diagram of a premixing device for recycling plastics for processing plastic wrap of the present invention after removing the sealing ring.

[0028] Figure 9 It is of a premixing device for recycling plastics for processing plastic wrap of the present invention Figure 7 Local enlarged schematic diagram at position D in it.

[0029] Figure 10 It is a sectional three-dimensional schematic Figure 2 .

[0030] Figure 11 It is a three-dimensional schematic diagram of a premixing device for recycling plastics for processing plastic wrap of the present invention after removing the outer shell.

[0031] The reference numerals in the figure are:

[0032] 1. Outer shell; 2. Inner shell; 21. First cavity; 22. Second cavity; 221. Drain hole; 23. Crushing unit; 231. Crushing sleeve; 232. Blade; 233. Transmission component; 2331. Third gear; 2332. Tooth ring; 2333. Connecting shaft; 24. Scraping plate; 25. Return groove; 251. Second filter screen; 252. Second fan; 26. Lifting unit; 261. Lifting sleeve; 262. Spiral blade; 263. Driving unit; 2631. Rotary driver; 2632. First gear; 2633. Second gear; 27. Connecting frame; 28. Third fan; 3. Screening unit; 31. Sealing ring; 32. Screening groove; 33. First fan; 34. First filter screen; 35. Heating wire. Detailed implementation manners

[0033] To further understand the features, technical means, and the specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0034] Refer to Figure 1 , Figure 2 , Figures 4 - 6 and Figure 11: A premixing device for recycling plastics for processing plastic wrap, comprising a housing 1, the housing 1 being of a cylindrical structure; an inner housing 2 is vertically arranged inside the housing 1, the inner housing 2 being of a tubular structure, a first cavity 21 is formed inside the inner housing 2, and a second cavity 22 exists between the outer peripheral wall of the inner housing 2 and the inner wall of the housing 1, the second cavity 22 being of an annular structure, the first cavity 21 and the second cavity 22 communicate with each other, and the communication point between the second cavity 22 and the first cavity 21 is located below the inner housing 2. A crushing unit 23 for crushing the recycled plastics is arranged in the first cavity 21. Drainage holes 221 are evenly opened at the bottom of the second cavity 22. A screening unit 3 is arranged in the second cavity 22. The screening unit 3 includes a blocking ring 31 fixedly arranged in the second cavity 22. A screening slot 32 is vertically penetrated through the blocking ring 31. A first blower 33 is arranged directly below the screening slot 32. The first blower 33 is arranged at the bottom of the housing 1. When the first blower 33 operates, the outside air flows upward in the vertical direction. The recycled plastics after being cleaned enter the second cavity 22 after being crushed in the first cavity 21 and enter the screening slot 32 under the action of the upward flowing air current generated by the first blower 33.

[0035] In traditional plastic recycling and processing, usually the following steps are required. First, the recycled plastics need to be cleaned, then the cleaned recycled plastics are dried, and the dried recycled plastics are crushed so that the recycled plastics are crushed into small particles, and finally they are uniformly mixed. It should be noted that during the process of crushing the dried recycled plastics, the recycled plastics being crushed are also stirred by the crushing unit 23, thereby achieving a premixing effect. In the prior art, the four steps that the recycled plastics go through during recycling are relatively independent. That is, when each step is completed and enters the next step, the recycled plastics need to be transported, and the transportation process not only takes time and effort but also reduces the recycling efficiency.

[0036] In order to avoid the above situation, the premixing device is redesigned so that the premixing device can simultaneously have the two functions of drying and crushing, and the recycled plastic particles discharged after being crushed must meet the pre-set mixed particle standard. The specific structure and working process of the premixing device of the present invention are as follows:

[0037] First, the recycled plastics after cleaning are put into the inner shell 2 from the upper part of the inner shell 2. The recycled plastics after cleaning first pass through the first cavity 21. The crushing unit 23 in the first cavity 21 crushes the recycled plastics in the first cavity 21. The crushing unit 23 can also promote the mixing of the recycled plastics while crushing them, so as to achieve a premixing effect. There is moisture in the recycled plastics after cleaning. The moisture attached to the recycled plastics falls to the bottom of the first cavity 21 under the action of gravity. Since the bottom of the first cavity 21 is connected to the bottom of the second cavity 22, the water flowing to the bottom of the first cavity 21 flows to the bottom of the second cavity 22 and is discharged from the drain hole 221 at the bottom of the second cavity 22.

[0038] The crushed recycled plastics fall to the bottom of the first cavity 21. The bottom of the first cavity 21 is of an inclined structure, and the inclined direction of the inclined structure is inclined downward towards the second cavity 22. In this way, the recycled plastics falling to the bottom of the first cavity 21 can be guided into the second cavity 22. The sealing ring 31 provided in the second cavity 22 completely seals the upper side of the second cavity 22, and a screening slot 32 is vertically penetrated through the sealing ring 31. At the same time, a first fan 33 is provided below the screening slot 32. In this way, when the first fan 33 is started, the first fan 33 can blow up the recycled plastics located at the bottom of the second cavity 22. The power of the first fan 33 is constant during operation, and the airflow blown by the first fan 33 during operation can blow out the recycled plastic particles meeting the standard from the screening slot 32 vertically from bottom to top. Specifically, the power setting of the first fan 33 during operation needs to be set according to the actual situation. Since the second cavity 22 is of an annular structure, the recycled plastics accumulated at the bottom of the second cavity 22 are also distributed in a ring shape. However, the position of the screening slot 32 remains unchanged. In this way, when screening the crushed recycled plastics, there is a problem that all the recycled plastics at the bottom of the second cavity 22 cannot be screened. Therefore, a scraping plate 24 that can rotate around the axis of the outer shell 1 is provided in the second cavity 22. The bottom of the scraping plate 24 is slidably matched with the bottom of the second cavity 22. The scraping plate 24 can completely sweep the bottom of the second cavity 22 when rotating. In this way, all the recycled plastics accumulated in the second cavity 22 can be pushed by the scraping plate 24 to pass under the screening slot 32. In this way, all the recycled plastics can be screened, ensuring that all the recycled plastics are in a smaller particle size when being formally mixed. The specific particle size standard needs to be determined according to actual production. Thus, the technical effect that the recycled plastics meeting the crushing standard can be discharged in time is achieved, without waiting for all the recycled plastics to be crushed to a specified time before being discharged together, and new recycled plastics to be crushed can be continuously put in during the crushing process, improving the crushing and mixing efficiency.

[0039] Refer to Figure 5Above the first fan 33, a first filter screen 34 is provided. The upper end surface of the first filter screen 34 is coplanar with the upper end surface of the second cavity 22. Between the first filter screen 34 and the first fan 33, a heating wire 35 is provided. When the first fan 33 is started, the heating wire 35 is synchronously powered on for heating.

[0040] In addition to providing a drain hole 221 at the bottom of the second cavity 22, in order to quickly dry the recycled plastic, a heating wire 35 and a first filter screen 34 are provided above the first fan 33. The first filter screen 34 ensures that the recycled plastic located in the second cavity 22 directly falls into the first fan 33, preventing damage to the first fan 33. The heating wire 35 provided between the first filter screen 34 and the first fan 33 can heat the air flow blown out by the first fan 33, enabling the hot air to pass through the first filter screen 34 to dry and dehydrate the recycled plastic. Thus, under the dual action of the drain hole 221 and the heating wire 35, the recycled plastic located in the second cavity 22 can be quickly dried.

[0041] Refer to Figure 5 and Figure 7 : At the bottom of the second cavity 22, a scraping plate 24 is rotatably provided around the axis of the housing 1. The bottom of the scraping plate 24 is in contact with and slidably engaged with the bottom of the second cavity 22. The sweeping area formed when the scraping plate 24 rotates completely covers the bottom of the second cavity 22.

[0042] This ensures that all the recycled plastic accumulated at the bottom of the second cavity 22 can pass under the screening groove 32 and be blown up by the air flow generated by the first fan 33. However, not all the recycled plastic can be successfully blown by the first fan 33. The specific reasons include that the recycled plastic has a large size and heavy weight or there is still moisture on the recycled plastic. The problem of moisture on the recycled plastic can be solved as follows: the heating wire 35 provided between the first fan 33 and the first filter screen 34 is used to dry the attached moisture on the recycled plastic. The specific treatment method for the large-sized recycled plastic will be described below.

[0043] Refer to Figure 7 and Figure 10 : A return groove 25 is also provided at the bottom of the second cavity 22. The return groove 25 has an inclined structure and extends downward from the second cavity 22 along the radial direction of the housing 1 to the first cavity 21. A lifting unit 26 is provided on the first cavity 21 in the vertical direction. The return groove 25 communicates with the lifting unit 26. The return groove 25 is used to store the recycled plastic that cannot be blown up by the first fan 33, and the lifting unit 26 is used to lift the recycled plastic stored in the return groove 25 to the upper part of the first cavity 21 and re-inject it into the first cavity 21.

[0044] Refer to Figure 7 and Figure 10: The lifting unit 26 includes a lifting sleeve 261 fixedly arranged at the bottom of the first cavity 21 in the vertical direction. The lifting sleeve 261 is in communication with the reflux groove 25. The lifting sleeve 261 is of a tubular structure, and the axis of the lifting sleeve 261 is collinear with the axis of the housing 1. A spiral blade 262 is rotatably arranged in the lifting sleeve 261 along the axis of the lifting sleeve 261. The spiral blade 262 extends to the bottom of the reflux groove 25. A driving unit 263 for driving the spiral blade 262 to rotate is arranged at the bottom of the reflux groove 25.

[0045] Refer to Figure 3 : The driving unit 263 includes a first gear 2632 fixedly arranged at the lower end of the spiral blade 262. A second gear 2633 is meshed on one side of the first gear 2632. A rotary driver 2631 for driving the second gear 2633 to rotate is arranged at the lower end of the second gear 2633. The rotary driver 2631 is fixedly arranged at the bottom of the housing 1.

[0046] The rotary driver 2631 is preferably a servo motor. After the rotary driver 2631 is started, the rotary driver 2631 drives the first gear 2632 to rotate through the second gear 2633. After the first gear 2632 rotates, the spiral blade 262 begins to rotate. The rotating spiral blade 262 lifts the recycled plastic located at the connection of the reflux groove 25 and the lifting sleeve 261. The recycled plastic gradually rises upward along the vertical direction under the action of the spiral blade 262 and falls back into the first cavity 21 after reaching the upper opening of the lifting sleeve 261. In this way, the crushing unit 23 can crush the falling recycled plastic for the second time.

[0047] Refer to Figure 10 : A second filter screen 251 is fixedly arranged at the bottom of the reflux groove 25 along the extending direction of the reflux groove 25. A second blower 252 is horizontally arranged below the second filter screen 251. The air flow blown out by the second blower 252 flows from the second cavity 22 towards the first cavity 21 side along the radial direction of the housing 1.

[0048] In this way, when the recycled plastic with moisture falls into the reflux groove 25, the situation that the recycled plastic adheres to the bottom of the reflux groove 25 and cannot move will not occur. The air flow blown out by the horizontally arranged second blower 252 is also in a horizontal state. When the horizontally flowing air flow passes through the second filter screen 251, it can not only blow the recycled plastic blocked on the second filter screen 251 away, but also guide the recycled plastic towards the direction of the lifting sleeve 261.

[0049] Refer to Figure 7 and Figure 8: The crushing unit 23 includes a crushing sleeve 231 vertically arranged in the first cavity 21. The axis of the crushing sleeve 231 is collinear with the axis of the outer shell 1. The crushing sleeve 231 rotates around its own axis. A plurality of blades 232 are evenly arranged on the side wall of the crushing sleeve 231. A transmission assembly 233 is arranged between the crushing sleeve 231 and the driving unit 263. The driving unit 263 drives the crushing sleeve 231 to rotate through the transmission assembly 233.

[0050] Refer to Figure 9 : The transmission assembly 233 includes a connecting shaft 2333 vertically penetrating the bottom of the outer shell 1. The connecting shaft 2333 is fixedly arranged at the upper end of the second gear 2633. A third gear 2331 is fixedly arranged at the upper end of the connecting shaft 2333. A toothed ring 2332 is meshed on one side of the third gear 2331. The axis of the toothed ring 2332 is collinear with the axis of the outer shell 1. The bottom of the crushing sleeve 231 is fixedly arranged at the upper end of the toothed ring 2332.

[0051] Thus, when the rotary driver 2631 is started, the rotary driver 2631 drives the second gear 2633 to rotate. The second gear 2633 drives the third gear 2331 to rotate through the connecting shaft 2333. Since the third gear 2331 and the toothed ring 2332 are meshed with each other, the toothed ring 2332 can drive the crushing sleeve 231 to rotate. It should be noted that the scraping plate 24 is also fixedly arranged on the side wall of the crushing sleeve 231. Thus, the scraping plate 24 and the crushing sleeve 231 rotate at the same speed, which ensures that the scraping plate 24 rotates at a relatively high speed. The scraping plate 24 rotating at a relatively high speed has the following advantages. First, it can prevent too much recycled plastic from accumulating at the bottom of the second cavity 22. Second, when the scraping plate 24 rotates one circle, the total amount of recycled plastic pushed by the scraping plate 24 is less, which is convenient for the first fan 33 to better realize the screening function.

[0052] Refer to Figure 2 and Figure 3 : A connecting frame 27 is fixedly arranged at the lower end of the first gear 2632. The connecting frame 27 extends from the inside to the outside along the radial direction of the outer shell 1. A third fan 28 is fixedly arranged at the end of the connecting frame 27 far away from the first gear 2632. The third fan 28 generates an air flow vertically from bottom to top.

[0053] Since a plurality of drain holes 221 for draining water are provided at the bottom of the second cavity 22, although a scraping plate 24 that rotates around the axis of the outer shell 1 is provided on the second cavity 22, it is impossible to ensure that some of the recycled plastics still block the drain holes 221. If the drain holes 221 are not cleaned for a long time during use, the drain holes 221 in the second cavity 22 will be completely blocked, and finally the water in the recycled plastics cannot be discharged through the drain holes 221, and in severe cases, water will accumulate at the bottom of the second cavity 22. The above situation can be avoided by providing the third blower 28. When the rotary driver 2631 is started, the crushing unit 23 and the connecting frame 27 rotate simultaneously. The connecting frame 27 rotates synchronously with the first gear 2632, and the connecting frame 27 drives the third blower 28 to rotate around the axis of the outer shell 1. Since the third blower 28 can generate an upward airflow. Thus, during the rotation of the third blower 28, the airflow blown by the third blower 28 can pass through the drain holes 221 from bottom to top and enter the second cavity 22, thereby realizing self-cleaning of the drain holes 221. And since the third blower 28 rotates around the axis of the outer shell 1, when the third blower 28 cleans the drain holes 221 on the second cavity 22, it will not affect the overall drainage effect of the drain holes 221, and the effect of self-cleaning the drain holes 221 can still be achieved without affecting the normal drainage function.

[0054] Working principle: First, the recycled plastics after cleaning are put into the inner shell 2 from the upper part of the inner shell 2. The recycled plastics after cleaning first pass through the first cavity 21. The crushing unit 23 in the first cavity 21 crushes the recycled plastics in the first cavity 21. There is water in the recycled plastics after cleaning. The water attached to the recycled plastics falls to the bottom of the first cavity 21 under the action of gravity. Since the bottom of the first cavity 21 is communicated with the bottom of the second cavity 22, the water flowing to the bottom of the first cavity 21 flows to the bottom of the second cavity 22 and is discharged from the drain holes 221 at the bottom of the second cavity 22. The crushed recycled plastics also fall on the first cavity 21. The crushed recycled plastics slide to the bottom of the second cavity 22 under the guidance of the inclined structure at the bottom of the first cavity 21. The scraping plate 24 that rotates around the axis of the outer shell 1 at the bottom of the second cavity 22 pushes the recycled plastics accumulated at the bottom of the second cavity 22, so that all the recycled plastics accumulated on the second cavity 22 can pass between the first blower 33 and the screening tank 32, thereby completing the screening of the recycled plastics that meet the standards.

[0055] The recycled plastics that do not meet the standards, that is, the recycled plastics with larger sizes, fall into the return chute 25 under the push of the scraping plate 24, and rise to the upper part of the first cavity 21 again under the action of the lifting unit 26 and then fall again. During the falling process, the crushing unit 23 performs secondary crushing on the recycled plastics, and this process repeats.

[0056] The above embodiments merely represent one or several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. A premixing device for recycling plastics for processing fresh-keeping films, comprising a housing (1), and the housing (1) is of a cylindrical structure; It is characterized in that An inner housing (2) is vertically arranged inside the housing (1), and the inner housing (2) is of a tubular structure. A first cavity (21) is formed inside the inner housing (2). There is a second cavity (22) between the outer peripheral wall of the inner housing (2) and the inner wall of the housing (1). The second cavity (22) is of an annular structure. The first cavity (21) and the second cavity (22) are interconnected, and the connection between the second cavity (22) and the first cavity (21) is located below the inner housing (2). A crushing unit (23) for crushing recycled plastics is arranged in the first cavity (21). Drainage holes (221) are uniformly formed at the bottom of the second cavity (22). A screening unit (3) is arranged in the second cavity (22). The screening unit (3) includes a blocking ring (31) fixedly arranged in the second cavity (22). A screening slot (32) is vertically penetrated through the blocking ring (31). A first fan (33) is arranged directly below the screening slot (32). The first fan (33) is arranged at the bottom of the housing (1). When the first fan (33) operates, the outside air flows upward in the vertical direction. After being cleaned, the recycled plastics enter the second cavity (22) after being crushed in the first cavity (21), and enter the screening slot (32) under the action of the upward flowing air flow generated by the first fan (33).

2. The premixing device for recycling plastics for processing fresh-keeping films according to claim 1, characterized in that, A first filter screen (34) is arranged above the first fan (33). The upper end surface of the first filter screen (34) is coplanar with the upper end surface of the second cavity (22). A heating wire (35) is arranged between the first filter screen (34) and the first fan (33). When the first fan (33) is started, the heating wire (35) is synchronously powered on for heating.

3. The premixing device for recycling plastics for processing fresh-keeping films according to claim 1, characterized in that, A scraping plate (24) is rotatably arranged around the axis of the housing (1) at the bottom of the second cavity (22). The bottom of the scraping plate (24) is in contact with and slidably matched with the bottom of the second cavity (22). The sweeping area formed when the scraping plate (24) rotates completely covers the bottom of the second cavity (22).

4. A premixing device for recycling plastics for processing fresh-keeping films according to claim 1, characterized in that, A return flow groove (25) is further formed at the bottom of the second cavity (22). The return flow groove (25) is of an inclined structure. The return flow groove (25) extends downward from the second cavity (22) to the first cavity (21) along the radial direction of the housing (1). A lifting unit (26) is vertically arranged on the first cavity (21). The return flow groove (25) is communicated with the lifting unit (26). The return flow groove (25) is used for storing recycled plastics that cannot be blown up by the first fan (33). The lifting unit (26) is used for lifting the recycled plastics stored in the return flow groove (25) to the upper part of the first cavity (21) and re-injecting them into the first cavity (21).

5. The premixing device for recycling plastics for processing fresh-keeping films according to claim 4, characterized in that, The lifting unit (26) includes a lifting sleeve (261) fixedly arranged at the bottom of the first cavity (21) in the vertical direction. The lifting sleeve (261) communicates with the reflux groove (25). The lifting sleeve (261) is of a tubular structure, and the axis of the lifting sleeve (261) is collinear with the axis of the housing (1). A spiral blade (262) is rotatably arranged in the lifting sleeve (261) along the axis of the lifting sleeve (261), and the spiral blade (262) extends to the bottom of the reflux groove (25). A driving unit (263) for driving the spiral blade (262) to rotate is arranged at the bottom of the reflux groove (25).

6. The premixing device for recycling plastics for processing fresh-keeping films according to claim 5, wherein, The driving unit (263) includes a first gear (2632) fixedly arranged at the lower end of the spiral blade (262). A second gear (2633) is meshed with one side of the first gear (2632). A rotary driver (2631) for driving the second gear (2633) to rotate is arranged at the lower end of the second gear (2633), and the rotary driver (2631) is fixedly arranged at the bottom of the housing (1).

7. The premixing device for recycling plastics for processing plastic wrap according to claim 4, characterized in that, A second filter screen (251) is fixedly arranged at the bottom of the reflux groove (25) along the extending direction of the reflux groove (25). A second blower (252) is horizontally arranged below the second filter screen (251), and the air flow blown out by the second blower (252) flows from the second cavity (22) towards the first cavity (21) side along the radial direction of the housing (1).

8. A premixing device for recycling plastics for processing fresh-keeping films according to claim 6, characterized in that, The crushing unit (23) includes a crushing sleeve (231) vertically arranged in the first cavity (21). The axis of the crushing sleeve (231) is collinear with the axis of the housing (1). The crushing sleeve (231) rotates around its own axis. A plurality of blades (232) are evenly arranged on the side wall of the crushing sleeve (231). A transmission assembly (233) is arranged between the crushing sleeve (231) and the driving unit (263), and the driving unit (263) drives the crushing sleeve (231) to rotate through the transmission assembly (233).

9. The premixing device for recycling plastics for processing fresh-keeping films according to claim 8, characterized in that, The transmission assembly (233) includes a connecting shaft (2333) vertically penetrating through the bottom of the housing (1). The connecting shaft (2333) is fixedly arranged at the upper end of the second gear (2633). A third gear (2331) is fixedly arranged at the upper end of the connecting shaft (2333). A toothed ring (2332) is meshed with one side of the third gear (2331). The axis of the toothed ring (2332) is collinear with the axis of the housing (1). The bottom of the crushing sleeve (231) is fixedly arranged at the upper end of the toothed ring (2332).

10. A premixing device for recycling plastics for processing fresh-keeping films according to claim 6, characterized in that, A connecting frame (27) is fixedly arranged at the lower end of the first gear (2632). The connecting frame (27) extends from the inside to the outside along the radial direction of the housing (1). A third blower (28) is fixedly arranged at the end of the connecting frame (27) far away from the first gear (2632), and the third blower (28) generates an air flow from bottom to top in the vertical direction.

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