A waste plastic regenerating mixing device for PVC pipe production

Abstract

This invention discloses a waste plastic recycling mixing device for PVC pipe production, comprising a mixing cylinder, a drive shaft, and a stirring mechanism. A coarse sleeve shaft is coaxially sleeved on the outside of the drive shaft. The outer surface of the coarse sleeve shaft is machined with three layers of planar mounting seats, namely an upper throwing mounting surface, a middle shearing mounting surface, and a bottom turning mounting surface, and a rotating rod is fixedly installed on each mounting surface. A throwing paddle, a shearing paddle, and a turning paddle are rotatably mounted on the upper throwing mounting surface, the middle shearing mounting surface, and the bottom turning mounting surface through their respective rotating rods. A first scraper is rotatably installed at the bottom of the turning paddle, and the first scraper slides against the bottom surface of the mixing cylinder. A slide rail is opened at one end of the turning paddle near the bottom turning mounting surface, and the rotating rod on the bottom turning mounting surface is inserted into the slide rail to form a sliding hinge structure.

Description

Technical Field

[0001] This invention relates to the field of waste plastic recycling technology, specifically a waste plastic recycling mixing device for PVC pipe production. Background Technology

[0002] In the process of recycling waste plastics in PVC pipe production, mixing is a key step. It is necessary to fully mix PVC waste and crushed materials, new materials and various additives to ensure that the mixture has uniform properties and avoid quality defects in the PVC pipes that are subsequently extruded.

[0003] Currently, most mixing equipment used for waste plastic recycling adopts a single-layer paddle structure. However, PVC waste plastic has characteristics such as large density differences, irregular particle shape, and easy adhesion to the wall when heated. Existing equipment has the following problems in actual use: Poor mixing uniformity: Single-layer paddles cannot simultaneously achieve multiple functions such as bottom layer turning, middle layer shearing and dispersion, and top layer scattering and mixing, which easily leads to component stratification and affects the quality of recycled materials; Insufficient paddle adaptability: Traditional paddles are mostly at a fixed angle and cannot dynamically adjust their working posture according to material characteristics (such as humidity, particle size, viscosity). When the batch of materials changes, the mixing effect fluctuates greatly; and serious bottom material accumulation can easily cause PVC material to overheat and degrade, reducing the utilization rate of recycled materials.

[0004] Therefore, it is necessary to provide a waste plastic recycling and mixing equipment for PVC pipe production to solve the problems mentioned in the background art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a waste plastic recycling mixing device for PVC pipe production, comprising a mixing cylinder, a drive shaft and a stirring mechanism, wherein a coarse sleeve shaft is coaxially sleeved on the outside of the drive shaft, and the outer surface of the coarse sleeve shaft is machined with three layers of planar mounting seats, namely an upper throwing mounting surface, a middle shearing mounting surface and a bottom turning mounting surface, and a rotating rod is fixedly installed on each mounting surface;

[0006] The upper throwing surface, the middle shearing surface, and the bottom turning surface are respectively rotatably mounted with a throwing paddle, a shearing paddle, and a turning paddle via their respective rotating rods. A first scraper is rotatably provided at the bottom of the turning paddle, and the first scraper slides against the bottom surface of the mixing cylinder.

[0007] The tipping paddle has a slide rail at one end near the bottom tipping mounting surface, and the rotating rod on the bottom tipping mounting surface is inserted into the slide rail to form a sliding hinge structure.

[0008] Preferably, the width of the first scraper is greater than the width of the material turning paddle. The first scraper has an arc-shaped mounting groove, and a connecting shaft is fixedly installed in the arc-shaped mounting groove. One end of the connecting shaft extends to the outside of the first scraper. A columnar strip is fixedly installed on the material turning paddle. The columnar strip is rotatably installed in the arc-shaped mounting groove, and the outer wall of the columnar strip is tightly fitted with the inner wall of the arc-shaped mounting groove.

[0009] Preferably, a movement gap is reserved between the end of the first scraper and the tipping paddle and the inner wall of the mixing cylinder. At least one second scraper is fixedly provided at the bottom of the coarse sleeve shaft. The second scraper slides against the bottom surface and side wall of the mixing cylinder. Wear-resistant strips are embedded at the bottom and side of the first scraper and the second scraper.

[0010] Preferably, a first transverse groove is formed on the bottom material turning mounting surface, and one end of the connecting shaft extending to the outside of the first scraper is slidably disposed along the first transverse groove. A first annular groove covering the first transverse groove is also formed on the bottom material turning mounting surface. A first sealing disc is rotatably mounted in the first annular groove. A through groove for the connecting shaft to pass through is formed on the first sealing disc. The first sealing disc is coplanar with the bottom material turning mounting surface, and the turning paddle and the first scraper are both sealed and fitted to the bottom material turning mounting surface and the first sealing disc.

[0011] Preferably, the coarse sleeve shaft has a first drive plate that is hydraulically driven to slide along the first transverse groove. The first drive plate has an inclined groove, and the end of the connecting shaft extending to the outside of the first scraper is slidably disposed along the inclined groove.

[0012] Preferably, a second annular groove is formed on the middle layer shear mounting surface, a second sealing disc is fixedly disposed on the shearing paddle, the second sealing disc is rotatably disposed in the second annular groove, and the outer surface of the second sealing disc is coplanar with the middle layer shear mounting surface;

[0013] The inner side of the second annular groove is provided with two first arc grooves, and the two ends of the shearing paddle are fixedly provided with support rods, which are slidably arranged along the two first arc grooves respectively.

[0014] Preferably, the coarse sleeve shaft has a second drive plate slidably disposed inside by hydraulic drive for driving the support rod to slide along the first arc groove. The second drive plate is composed of two ear plates fixedly connected together. The two ear plates are respectively provided with a second transverse groove and a second arc groove. The two support rods are respectively slidably disposed along the second transverse groove and the second arc groove.

[0015] Preferably, the throwing paddle and the shearing paddle have the same structure, and a third drive plate for driving the throwing paddle to rotate is hydraulically driven and slidably disposed inside the coarse sleeve shaft. The third drive plate has the same structure as the second drive plate and the same driving principle.

[0016] Preferably, the throwing paddle is provided in two pieces, which are evenly distributed on the upper throwing mounting surface at a 180° angle to each other;

[0017] The shearing paddle is provided in three pieces, evenly distributed at 120° on the middle layer shearing mounting surface;

[0018] Two material-turning paddles are provided, evenly distributed on the bottom material-turning mounting surface at a 180° angle to each other;

[0019] Furthermore, the throwing paddle, shearing paddle, and turning paddle are arranged staggered from each other along the circumference of the coarse sleeve shaft.

[0020] Preferably, the coarse sleeve shaft has multiple sets of independent hydraulic oil passages inside, and each set of hydraulic oil passages respectively drives the first drive plate, the second drive plate and the third drive plate.

[0021] The upper end of the drive spindle is connected to a multi-channel rotary hydraulic joint, which supplies oil to each layer of hydraulic drive mechanism.

[0022] Compared with the prior art, the present invention provides a waste plastic recycling and mixing device for PVC pipe production, which has the following beneficial effects:

[0023] First, the mixing effect is significantly improved and the quality of the mixture is more stable: This equipment adopts three layers of stirring blades with clearly defined functions, which are staggered in the circumference to avoid short-circuiting and falling of materials. This allows the recycled PVC material, new material and additives to undergo multiple cycles, shearing and tumbling in the cylinder, which greatly improves the uniformity of mixing. This provides a stable raw material for subsequent PVC pipe molding, and the finished product is free of pits and streaks and has uniform mechanical properties.

[0024] Secondly, it completely solves the problem of bottom material accumulation and avoids PVC degradation: by sliding the first scraper along the bottom throughout the entire process and the second scraper cleaning the side walls and corners, it achieves material cleaning without dead corners in the entire cylinder, eliminating the problems of overheating, yellowing and degradation caused by bottom material accumulation in traditional equipment, significantly improving the utilization rate of recycled materials and reducing production costs.

[0025] Third, the sealing structure is perfect, dust is not easy to enter, and the equipment has high reliability: the bottom first sealing disc, the middle second sealing disc and the fitting installation surface together form a multi-layer seal, which effectively prevents PVC fine powder from entering the hinge gap, transverse groove and internal drive cavity, and avoids the connecting shaft, support rod and drive plate being stuck by dust. The equipment has strong stability and low failure rate during long-term continuous operation.

[0026] Fourth, the angles of the three-layer blades are independently hydraulically adjustable, making them highly adaptable: the angles of the throwing blade, shearing blade, and tipping blade can all be adjusted individually, allowing for flexible changes in stirring intensity and circulation effect based on material ratio, temperature, and particle size. It is especially suitable for heat-sensitive PVC materials, effectively controlling the rate of temperature rise and preventing degradation. It has a wide range of applications and high process flexibility.

[0027] Fifth, hydraulic pressure holding and locking ensures high blade rigidity and stable high-speed operation: After the angle is adjusted to the correct position, rigid locking is achieved through hydraulic pressure holding. The blades do not shake or deviate under high-speed stirring and material impact. The overall structure has sufficient rigidity, and the equipment operates smoothly with low noise and a long service life. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the drive spindle and the coarse sleeve shaft in this invention;

[0030] Figure 3 This is a schematic diagram of the structure of the middle layer shearing mounting surface and the bottom layer turning mounting surface in this invention;

[0031] Figure 4 This is a schematic diagram of the structure of the first sealing disc in this invention;

[0032] Figure 5 This is a schematic diagram of the structure of the first driving board in this invention;

[0033] Figure 6 This is a schematic diagram of the structure of the second drive board in this invention;

[0034] Figure 7 This is a schematic diagram of the shearing paddle structure in this invention;

[0035] Figure 8 This is a schematic diagram of the material-turning paddle in this invention;

[0036] Figure 9 This is a schematic diagram of the structure of the first scraper in this invention;

[0037] In the diagram: 1. Mixing cylinder; 2. Drive spindle; 3. Coarse sleeve shaft; 31. Rotating rod; 32. Second scraper; 33. First transverse groove; 34. First annular groove; 35. First sealing disc; 351. Through groove; 36. First drive plate; 361. Inclined groove; 37. First arc groove; 38. Second drive plate; 381. Second transverse groove; 382. Second arc groove; 4. Throwing paddle; 5. Shearing paddle; 51. Second sealing disc; 52. Support rod; 6. Turning paddle; 61. Slide rail; 62. Columnar strip; 7. First scraper; 71. Arc-shaped mounting groove; 72. Connecting shaft. Detailed Implementation

[0038] Please see Figures 1-9 In this embodiment of the invention, a waste plastic recycling mixing device for PVC pipe production includes a mixing cylinder 1, a drive main shaft 2, a coarse sleeve shaft 3, a three-layer stirring blade assembly, multiple sets of sealing structures, and a built-in hydraulic drive mechanism. The mixing cylinder 1 is a vertical cylindrical cavity with a sealed top cover. The drive main shaft 2 is vertically arranged at the center of the cylinder and is driven to rotate by a top motor. The coarse sleeve shaft 3 is coaxially sleeved on the outside of the drive main shaft 2 and rotates synchronously with it. The outer surface of the coarse sleeve shaft 3 is machined with three layers of planar mounting seats from top to bottom, namely an upper throwing mounting surface, a middle shearing mounting surface, and a bottom turning mounting surface. A rotating rod 31 is fixed on each mounting surface, corresponding to the throwing blade 4, the shearing blade 5, and the turning blade 6, respectively.

[0039] Each blade can be swung around the corresponding rotating rod 31 under hydraulic drive to achieve angle adjustment; the bottom of the tipping blade 6 is hinged to the first scraper 7, which is always in sliding contact with the bottom surface of the cylinder to achieve scraping without dead angles. Multiple independent hydraulic oil channels are opened inside the coarse sleeve shaft 3, which, together with the top multi-channel rotary hydraulic joint, realize independent oil supply and pressure holding lock in the rotating state.

[0040] In this embodiment, the mixing cylinder 1 is made of wear-resistant stainless steel with a smooth inner wall. A discharge port is opened on the lower side of the cylinder for discharging material after mixing. The drive shaft 2 is a high-strength solid shaft with its upper end extending out of the cylinder cover and connected to the drive motor. Its lower end extends into the cylinder and is fixedly connected to the coarse sleeve shaft 3 to achieve synchronous power input. The coarse sleeve shaft 3 and the drive shaft 2 are connected by a key to ensure circumferential locking and synchronous rotation. The shaft has high overall rigidity, low vibration and stable dynamic balance during high-speed operation. The three-layer flat mounting base on the outer surface of the coarse sleeve shaft 3 is a precision-machined flat surface with high surface smoothness, which facilitates sealing with the root of the blade and prevents powder from entering the internal adjustment mechanism.

[0041] In this embodiment, the throwing paddle 4 is rotatably mounted on the upper throwing mounting surface via the rotating rod 31. The paddle blades can rotate around the rotating rod 31 to adjust the angle. There are two throwing paddles 4, symmetrically distributed at 180°, mainly used to throw materials upward and outward to form an axial circulation and prevent materials from accumulating on the upper part of the cylinder. The shearing paddle 5 is rotatably mounted on the middle shearing mounting surface via the rotating rod 31. There are three shearing paddles 5, evenly distributed at 120°, used to perform strong shearing, dispersing and mixing of materials, so that PVC recycled material, new material and additives are fully mixed. The angle of the shearing paddle 5 is adjustable, and the shearing intensity can be changed according to the material temperature and mixing state to prevent PVC from overheating and degrading. The turning paddle 6 is hinged to the bottom turning mounting surface via the rotating rod 31. Two blades are arranged symmetrically at 180°. A slide rail 61 is provided at one end of the tipping paddle 6 near the mounting base. The rotating rod 31 extends into the slide rail 61 to form a sliding hinge, so that the tipping paddle 6 can slide while rotating to adjust the angle, thereby changing the rotation center of the tipping paddle 6. The bottom of the tipping paddle 6 is rotatably connected to the first scraper 7. The width of the first scraper 7 is greater than that of the tipping paddle 6. An arc-shaped mounting groove 71 is provided on the first scraper 7. A connecting shaft 72 is fixed in the groove. One end of the connecting shaft 72 extends outward. A columnar strip 62 is fixed at the bottom of the tipping paddle 6. The columnar strip 62 is rotatably fitted in the arc-shaped mounting groove 71, and the outer wall is tightly fitted with the inner wall of the groove, which not only ensures flexible rotation, but also prevents powder from entering the hinge gap and avoids jamming and wear.

[0042] It should be noted that the hinged connection between the slide rail 61 and the rotating rod 31 enables the first scraper 7 and the material turning paddle 6 to form a flexible hinge. When the first scraper 7 slides along the bottom of the mixing cylinder 1, the material turning paddle 6 can adaptively adjust its angle. That is, no matter how the angle of the material turning paddle 6 is adjusted, the first scraper 7 at its bottom can always fit against the bottom surface of the mixing cylinder 1 to scrape the material.

[0043] In this embodiment, at least one second scraper 32 is fixed to the bottom of the coarse sleeve shaft 3. The second scraper 32 slides against the bottom surface of the cylinder and part of the side wall, filling the scraping blind area of ​​the first scraper 7 and realizing comprehensive cleaning of the bottom and corner positions of the cylinder. Wear-resistant strips are embedded on the bottom and side surfaces of the first scraper 7 and the second scraper 32 to reduce sliding friction resistance, improve service life, and maintain good adhesion even after long-term use, without producing material accumulation gaps.

[0044] In this embodiment, a first transverse groove 33 is formed on the bottom flipping mounting surface. The extended end of the connecting shaft 72 passes through the first transverse groove 33 and can slide along it. A first annular groove 34 is formed on the mounting surface, and a first sealing disc 35 is built in. A through groove 351 is formed on the first sealing disc 35 for the connecting shaft 72 to pass through. The first sealing disc 35 is coplanar with the bottom flipping mounting surface. The flipping paddle 6 and the first scraper 7 are both in close contact with the mounting surface and the sealing disc to form a continuous sealing surface, which effectively prevents PVC powder from entering the first transverse groove 33 and the interior of the coarse sleeve shaft 3, and avoids the connecting shaft 72 from being stuck by dust.

[0045] It should be explained that the first sealing disc 35 is a circular disc that can cover and shield the first transverse groove 33 to prevent dust from entering the first transverse groove 33. At the same time, a through groove 351 is opened on the first sealing disc 35. The connecting shaft 72 is allowed to slide along the inside of this through groove 351 to balance the horizontal sliding of the connecting shaft 72 and the rotation of the first sealing disc 35. This through groove 351 is blocked by the scraper 7, i.e., the material turning paddle 6, thereby effectively preventing dust from entering this through groove, thus avoiding dust from entering the inside of the coarse sleeve shaft 3, and ensuring that the rotation adjustment of the material turning paddle 6 will not cause jamming.

[0046] In particular, to achieve a more advanced sealing effect, an airbag sealing ball can be provided between the connecting shaft 72 and the through groove 351. When the connecting shaft 72 slides along the through groove 351, it will squeeze the airbag sealing ball, causing the airbag sealing ball to self-adaptively contract and expand, thereby filling the gap between the two and preventing dust from entering.

[0047] In this embodiment, a first drive plate 36 is slidably disposed inside the coarse sleeve shaft 3 and is hydraulically driven to move axially. A groove 361 is formed on the first drive plate 36, and the extended end of the connecting shaft 72 extends into the groove 361 to form a sliding fit. When the first drive plate 36 moves axially, the groove 361 pushes the connecting shaft 72 to slide along the first transverse groove 33, thereby pulling the first scraper 7 to slide along the bottom material turning installation surface. At the same time, the material turning paddle 6 rotates and slides around the rotating rod 31 to achieve angle adjustment. After the adjustment is completed, the hydraulic system holds pressure to lock the position of the first drive plate 36 and rigidly fix the angle of the material turning paddle 6, so that it does not deviate or shake during high-speed stirring.

[0048] In this embodiment, a second annular groove is formed on the middle shear mounting surface, and a second sealing disc 51 is fixed on the shearing paddle 5. The second sealing disc 51 is rotatably mounted in the second annular groove and is coplanar with the mounting surface to form a reliable seal and prevent powder from entering. Two first arc grooves 37 are formed on the inner side of the second annular groove, and the support rods 52 at both ends of the shearing paddle 5 slide along the first arc grooves 37 respectively. A second drive plate 38 is slidably arranged inside the coarse sleeve shaft 3. The second drive plate 38 is composed of two ear plates, and a second transverse groove 381 and a second arc groove 382 are formed respectively. The two support rods 52 slide with the corresponding grooves respectively. The second drive plate 38 moves axially under hydraulic drive, pushing the support rods 52 to slide along the first arc grooves 37 to realize the angle adjustment of the shearing paddle 5. After adjustment, it is also locked by hydraulic pressure holding.

[0049] In this embodiment, the throwing paddle 4 and the shearing paddle 5 have the same structure. The coarse sleeve shaft 3 is equipped with a third drive plate, which has the same structure as the second drive plate 38 and the same driving method, so as to realize the independent angle adjustment of the throwing paddle 4. The three layers of blades are independently adjustable and do not interfere with each other. The angle can be set separately according to the process requirements.

[0050] In this embodiment, the throwing paddle 4 (2 blades), shearing paddle 5 (3 blades), and turning paddle 6 (2 blades) are all evenly distributed circumferentially, and the three layers of paddles are staggered at a certain angle to avoid forming a vertically penetrating channel. This prevents the material from falling directly without being fully mixed, and allows the material to undergo multiple throwing, shearing, and turning in the cylinder, which significantly improves the mixing uniformity.

[0051] In this embodiment, multiple independent hydraulic oil passages are opened inside the coarse sleeve shaft 3, which correspond to the hydraulic drive mechanisms of the first drive plate 36, the second drive plate 38 and the third drive plate respectively; the upper end of the drive spindle 2 is connected to a multi-channel rotary hydraulic joint, which can stably supply oil to each layer of hydraulic mechanism while the spindle is continuously rotating, and realize pressure holding, pressure release and angle fine adjustment, with precise control and rapid response.

[0052] During implementation, after the equipment is started, the motor drives the main shaft 2 and the coarse sleeve shaft 3 to rotate at high speed. The three layers of blades rotate synchronously. The material is put into the cylinder through the top feed port. The throwing blade 4 throws the material upward to form a circulation. The shearing blade 5 performs strong shearing and dispersion on the material. The turning blade 6, together with the first scraper 7 and the second scraper 32, continuously cleans the bottom to prevent the material from accumulating and overheating. At the same time, the angle of each blade can be hydraulically adjusted in real time according to the material temperature and the degree of mixing: when the temperature is too high, the angle of the shearing blade is increased to reduce the shearing intensity; when it is necessary to strengthen the circulation, the angle of the throwing blade is increased; when discharging, the overall blade tilt angle can be increased to improve the pushing effect; after mixing is completed, the discharge port is opened, and the material is smoothly discharged under the pushing action of the blades.

[0053] In summary, this invention effectively solves the problems of material stratification, wall adhesion, and uneven mixing in the PVC waste plastic recycling process by using a multi-layer composite blade structure, an oscillating mechanism that combines adaptive and active control, and an integrated hydraulic drive system. It has the advantages of compact structure, high mixing efficiency, and strong adaptability.

[0054] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A waste plastic recycling mixing device for PVC pipe production, comprising a mixing cylinder (1), a drive shaft (2), and a stirring mechanism, characterized in that, The drive spindle (2) is coaxially fitted with a coarse sleeve shaft (3). The outer surface of the coarse sleeve shaft (3) is machined with three layers of planar mounting seats, namely the upper throwing mounting surface, the middle shearing mounting surface and the bottom flipping mounting surface, and each mounting surface is fixedly equipped with a rotating rod (31). The upper throwing surface, the middle shearing surface and the bottom turning surface are respectively rotatably mounted with a throwing paddle (4), a shearing paddle (5) and a turning paddle (6) by their respective rotating rods (31). The bottom of the turning paddle (6) is rotatably provided with a first scraper (7), which slides against the bottom surface of the mixing cylinder (1). The material turning paddle (6) has a slide rail (61) at one end near the bottom material turning mounting surface, and the rotating rod (31) on the bottom material turning mounting surface is inserted into the slide rail (61) to form a sliding hinge structure.

2. The waste plastic recycling mixing equipment for PVC pipe production according to claim 1, characterized in that, The width of the first scraper (7) is greater than the width of the material turning paddle (6). An arc-shaped mounting groove (71) is provided on the first scraper (7). A connecting shaft (72) is fixedly provided in the arc-shaped mounting groove (71). One end of the connecting shaft (72) extends to the outside of the first scraper (7). A columnar strip (62) is fixedly provided on the material turning paddle (6). The columnar strip (62) is rotatably provided in the arc-shaped mounting groove (71), and the outer wall of the columnar strip (62) is tightly fitted with the inner wall of the arc-shaped mounting groove (71).

3. The waste plastic recycling mixing equipment for PVC pipe production according to claim 1, characterized in that, The ends of the first scraper (7) and the turning paddle (6) are reserved with a movement gap between them and the inner wall of the mixing cylinder (1). At least one second scraper (32) is fixedly provided at the bottom of the coarse sleeve shaft (3). The second scraper (32) slides against the bottom surface and side wall of the mixing cylinder (1) at the same time. Wear-resistant strips are embedded at the bottom and side of the first scraper (7) and the second scraper (32).

4. The waste plastic recycling mixing equipment for PVC pipe production according to claim 2, characterized in that, A first transverse groove (33) is provided on the bottom material turning mounting surface. The connecting shaft (72) extends to one end outside the first scraper (7) and slides along the first transverse groove (33). A first annular groove (34) covering the first transverse groove (33) is also provided on the bottom material turning mounting surface. A first sealing disc (35) is rotatably installed in the first annular groove (34). A through groove (351) for the connecting shaft (72) to pass through is provided on the first sealing disc (35). The first sealing disc (35) is coplanar with the bottom material turning mounting surface. The turning paddle (6) and the first scraper (7) are both sealed and fitted with the bottom material turning mounting surface and the first sealing disc (35).

5. A waste plastic recycling mixing device for PVC pipe production according to claim 4, characterized in that, The coarse sleeve shaft (3) has a first drive plate (36) inside which is hydraulically driven to drive the connecting shaft (72) to slide along the first transverse groove (33). The first drive plate (36) has an inclined groove (361) and the end of the connecting shaft (72) extending to the outside of the first scraper (7) slides along the inclined groove (361).

6. A waste plastic recycling mixing device for PVC pipe production according to claim 5, characterized in that, A second annular groove is provided on the middle layer shear mounting surface, and a second sealing disc (51) is fixedly provided on the shearing paddle (5). The second sealing disc (51) is rotatably disposed in the second annular groove, and the outer surface of the second sealing disc (51) is coplanar with the middle layer shear mounting surface. The second annular groove has two first arc grooves (37) on its inner side. Both ends of the shearing paddle (5) are fixedly provided with support rods (52), and the two support rods (52) are slidably arranged along the two first arc grooves (37).

7. A waste plastic recycling mixing device for PVC pipe production according to claim 6, characterized in that, The coarse sleeve shaft (3) is hydraulically driven to slide a second drive plate (38) for driving the support rod (52) to slide along the first arc groove (37). The second drive plate (38) is composed of two ear plates fixedly connected. The two ear plates are respectively provided with a second transverse groove (381) and a second arc groove (382). The two support rods (52) are respectively slidably arranged along the second transverse groove (381) and the second arc groove (382).

8. A waste plastic recycling mixing device for PVC pipe production according to claim 7, characterized in that, The throwing paddle (4) has the same structure as the shearing paddle (5). The coarse sleeve shaft (3) has a third drive plate that is hydraulically driven to drive the throwing paddle (4) to rotate. The third drive plate has the same structure as the second drive plate (38) and the same driving principle.

9. A waste plastic recycling mixing device for PVC pipe production according to claim 1, characterized in that, Two throwing paddles (4) are provided, which are evenly distributed on the upper throwing mounting surface at a 180° angle to each other; The shearing paddle (5) is provided in 3 pieces, which are evenly distributed at 120° on the middle shearing mounting surface; Two material-turning paddles (6) are provided, which are evenly distributed on the bottom material-turning mounting surface at a 180° angle to each other; Furthermore, the throwing paddle (4), shearing paddle (5) and turning paddle (6) are arranged staggered from each other along the circumference of the coarse sleeve shaft (3).

10. A waste plastic recycling mixing device for PVC pipe production according to claim 8, characterized in that, The coarse sleeve shaft (3) has multiple sets of independent hydraulic oil passages inside, and each set of hydraulic oil passages drives the first drive plate (36), the second drive plate (38) and the third drive plate respectively. The upper end of the drive spindle (2) is connected to a multi-channel rotary hydraulic joint, which supplies oil to each layer of hydraulic drive mechanism through the rotary hydraulic joint.

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