Polyhydrogen ester thermal insulation pipe waste foam crushing, screening and recycling system

Abstract

The invention relates to the technical field of waste plastic recovery, in particular to a polyhydroester thermal insulation pipe waste foam crushing, screening and recovering system. The device comprises a crushing device used for executing shearing and crushing actions on the polyurethane thermal insulation pipe, the crushing device comprises a crushing cavity, a shearing knife set used for crushing the polyurethane thermal insulation pipe is arranged in the crushing cavity, and a grating is arranged at the bottom of the shearing knife set and used for enabling materials obtained after the polyurethane thermal insulation pipe is crushed to naturally fall out of the crushing cavity; when the gravity difference of particles on the two sides of the rotating shaft at the top of the baffle exceeds the deformation resistance of the coil spring, the balance of the baffle in the overturning channel is broken, the baffle inclines in the overturning channel, and the rotating shaft drives the limiting block at the tail end of the periphery of the coil spring to slide out of one limiting groove and slide along the inner wall of the sliding space. Meanwhile, due to the fact that the baffle inclines, the balance weight ball in the movable cavity slides downwards under the action of the gravity of the balance weight ball, and it is guaranteed that the limiting block can slide into the next limiting groove.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste plastic recycling, in particular to a polyhydroxy urethane insulation pipe waste foam crushing and screening recovery system. BACKGROUND

[0002] The polyurethane insulation pipe belongs to composite solid waste (containing polyurethane foam, metal pipe and outer protective shell), and if it is not recycled directly, it will cause multiple hazards to the environment. Since the density of polyurethane foam is only 30-60 kg / m³, and the elastic modulus is high (compression recovery rate > 90%).

[0003] The existing general crushing equipment will gradually accumulate the soft particles (mainly broken foam) and hard particles (mainly broken metal and broken protective shell, the amount of which is less than that of the foam) obtained after crushing the insulation pipe in the bottom of the crushing cavity. If these foams are allowed to accumulate, the crushing cavity will be full to a certain extent, and the crushing device must be closed to remove the foams inside, otherwise the crushing efficiency of the polyurethane insulation pipe will be affected. If the bottom of the crushing cavity is provided with a grid structure, the crushed foams can leak out of the crushing cavity. However, the foams are light and fluffy, and are easy to accumulate into an "arch shape" (bridge) at the grid, which blocks the grid, so that the foams at the blocked position cannot naturally fall, thereby affecting the crushing efficiency of the entire crushing device for the polyurethane insulation pipe.

[0004] In view of this, we propose a polyhydroxy urethane insulation pipe waste foam crushing and screening recovery system to improve the deficiencies in the prior art. SUMMARY

[0005] The present application provides a polyhydroxy urethane insulation pipe waste foam crushing and screening recovery system, which solves the problem that the foams are light and fluffy, and are easy to accumulate into an "arch shape" (bridge) at the grid at the bottom of the crushing cavity, which blocks the grid, so that the foams at the blocked position cannot naturally fall, thereby affecting the crushing efficiency of the entire crushing device for the polyurethane insulation pipe.

[0006] To achieve the above-mentioned purpose, the polyhydroxy urethane insulation pipe waste foam crushing and screening recovery system comprises a crushing device for performing a shearing crushing action on the polyurethane insulation pipe, the crushing device comprising a crushing cavity, a shearing cutter group for crushing the polyurethane insulation pipe being arranged inside the crushing cavity, and a grid being arranged at the bottom of the shearing cutter group for the materials obtained after crushing the polyurethane insulation pipe to naturally fall out of the crushing cavity. The outer bottom wall of the crushing cavity is fixedly connected with a mounting arm, a turnover channel is formed below the grid, a baffle for catching the crushed materials to prevent them from splashing is rotatably connected in the turnover channel, the center of gravity of the baffle is not fixed, so that when the material on the top of the baffle accumulates to a certain amount, the balance of the baffle to block the falling of the material is broken, and then the baffle is turned over to make the material fall from the opened turnover channel. The grid and the shear cutter group are slidably connected to the bottom, when the plane of the baffle is perpendicular to the plane of the turnover channel, the height of the top of the baffle is higher than the height of the bottom of the grid in the natural falling state, that is, in the process of turning over, the grid is driven to slide upward, and then the grid is naturally reset downward under the action of its own gravity, and the process of the grid shaking breaks the "bridge" effect of the foam on the top of the grid, so that the blocked material of the grid can fall through the grid to the lower side.

[0007] In the above technical solution, the shear cutter group includes a movable cutter rotating around the axis of the crushing cavity and a static cutter fixedly connected to the inner side wall of the crushing cavity, the movable cutter and the static cutter are each provided with multiple layers according to the height gradient, and the number of layers of the movable cutter is the same as that of the static cutter.

[0008] The top of the crushing cavity is provided with a hopper, the inner side wall of the hopper is fixedly connected with a mounting frame, the mounting frame is rotatably connected with a main rod downward in the crushing cavity, multiple layers of the movable cutter are distributed along the axial direction of the main rod, and the movable cutters in the same layer are distributed along the radial direction of the main rod.

[0009] In another technical solution, the inner diameter of the crushing cavity gradually decreases from high to low.

[0010] The top edge of the grid is provided with a surrounding fence, the outer side wall of the surrounding fence is fixedly connected with a limiting ring, and the surrounding fence and the limiting ring are slidably connected to the inner side wall of the crushing cavity. In the above solution, the inner side wall of the baffle is provided with a movable cavity, and the movable cavity is provided with multiple freely slidable counterweight balls.

[0011] Furthermore, the mounting arm is provided with mounting grooves at intervals on the two sides away from the turnover channel, the rotating shafts of the baffles are rotatably connected in the mounting grooves, the rotating shafts of the baffles are each surrounded by a coil spring for limiting the position of the baffle in the turnover channel, and the inner circle of the coil spring is fixedly connected with the rotating shaft of the baffle.

[0012] Further, the bottom of the mounting groove is open, a buckle is inserted into the bottom of the mounting groove, and the mounting groove and the top of the buckle surround a sliding space with a circular cross section.

[0013] The sliding space inner wall is provided with a pair of limiting grooves, the outer peripheral end of the coil spring is fixedly connected with a limiting block, the shape of the limiting block is matched with the limiting grooves, one of the limiting grooves is located on the inner top wall of the mounting groove, and the other limiting groove is located on the inner bottom wall of the buckle Based on the above scheme, the bottom of the crushing cavity is fixedly and spacedly provided with a bottom plate below the mounting arm, a flotation tank is arranged between the top of the bottom plate and the mounting arm, a polytetrafluoroethylene coating is laid on the inner wall of the crushing cavity, and the friction coefficient is less than 0.1.

[0014] Based on the above description, compared with the prior art, the beneficial effects of the present application are: When the particle gravity difference on both sides of the baffle top rotating shaft exceeds the deformation resistance of the coil spring, the balance of the baffle in the turnover channel is broken, so that the baffle is inclined in the turnover channel, the rotating shaft drives the limiting block at the outer peripheral end of the coil spring to slide out of one of the limiting grooves, and slides along the inner wall of the sliding space. At the same time, due to the inclination of the baffle, the counterweight ball in the movable cavity slides downward under the action of its own gravity, ensuring that the limiting block can slide into the next limiting groove. During this time, the baffle rotates 180°, thereby sliding the crushed material originally resting on the top of the baffle into the flotation tank below.

[0015] During the passage of the baffle from the grid bottom, the edge of the baffle drives the grid to slide up, and after the edge of the baffle leaves the grid bottom, the grid naturally slides down to reset under the action of its own gravity, and this shaking process breaks the foam "bridge" on the top of the grid, so that the blocked crushed particles can all fall from the crushing cavity to the baffle, and then slide from the inclined baffle to the flotation tank. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings: Figure 1 It is a perspective view of the overall structure of the present application; Figure 2 It is a partial cutaway perspective view of the present application; Figure 3 It is a partial cutaway front view of the present application; Figure 4 It is a perspective view of the shear cutter group of the present application; Figure 5 It is a front view of the shear cutter group of the present application; Figure 6 It is a perspective view of the shear cutter group of the present application; Figure 4 It is an enlarged view of position A in the present application; Figure 7 It is an enlarged view of position B in the present application; Figure 5 It is an enlarged view of position B in the present application;Figure 8 It is a sectional view of the baffle and mounting arm of the present application; Figure 9 It is a sectional front view of the baffle and mounting arm of the present application; Figure 10 It is a sectional view of the mounting slot of the baffle of the present application; Figure 11 It is a sectional view of the baffle and mounting arm of the present application; Figure 10 It is an enlarged view of C in the middle.

[0017] The meanings of various reference numbers in the figure are as follows: 100, crushing cavity; 101, hopper; 110, shear cutter group; 111, movable cutter; 112, static cutter; 120, grid; 130, bottom plate; 131, flotation tank; 200, baffle; 210, mounting arm; 211, turnover channel; 212, mounting slot; 213, buckle; 214, limiting slot; 220, coil spring; 230, movable cavity; 240, counterweight ball. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] Foam is light and fluffy, and is easy to accumulate into "bridges" at the grid at the bottom of the crushing cavity, thereby blocking the grid and preventing the foam at the blocked position from falling naturally, which further affects the entire crushing device for polyurethane insulation pipes. For details, please refer to Figures 1-3 .

[0020] The present embodiment aims to provide a polyurethane insulation pipe waste foam crushing and screening recovery system, which comprises a crushing device for performing a shearing crushing action on a polyurethane insulation pipe. The crushing device comprises a crushing cavity 100, and a shear cutter group 110 for crushing the polyurethane insulation pipe is arranged inside the crushing cavity 100. A grid 120 is arranged at the bottom of the shear cutter group 110 for the crushed polyurethane insulation pipe to fall out of the crushing cavity 100 naturally. A mounting arm 210 is fixedly connected to the outer bottom wall of the crushing cavity 100. A turnover channel 211 is formed below the grid 120 of the mounting arm 210. A baffle 200 for catching the crushed material to prevent it from splashing is rotatably connected in the turnover channel 211. The center of gravity of the baffle 200 is not fixed, so that when the material accumulated on the top of the baffle 200 reaches a certain amount, the balance of the baffle 200 blocking the falling of the material is broken, and then the baffle 200 turns over to make the material fall from the opened turnover channel 211. The bottom of the grid 120 is slidably connected to the shearing blade assembly 110. When the plane of the baffle 200 is perpendicular to the plane of the flipping channel 211, the top height of the baffle 200 is higher than the bottom height of the grid 120 in the natural falling state. That is to say, during the flipping process, the baffle 200 drives the grid 120 to slide upward, and then the grid 120 naturally returns to its original position under its own gravity. This turbulent process of the grid 120 breaks the "bridging" effect formed by the foam at the top, allowing the material blocked by the grid 120 to pass through the grid 120 and fall to the bottom.

[0021] like Figure 4 and Figure 5 As shown, the shearing blade assembly 110 includes a movable blade 111 that rotates around the axis of the crushing chamber 100 and a stationary blade 112 that is fixedly connected to the inner wall of the crushing chamber 100. The movable blade 111 and the stationary blade 112 are arranged in multiple layers according to the height gradient, and the number of layers is the same. The movable blade 111 in the same layer is located above the stationary blade 112.

[0022] The top of the crushing chamber 100 is provided with a hopper 101. A mounting frame is fixedly connected to the inner side wall of the hopper 101. The mounting frame is rotatably connected to the main rod inside the crushing chamber 100. Multiple layers of movable blades 111 are distributed along the axial direction of the main rod, and the movable blades 111 in the same layer are distributed along the radial direction of the main rod.

[0023] The multi-layered design of the moving blade 111 and the stationary blade 112 essentially sets up "multiple shearing checkpoints" along the material's falling path, solving the problem of insufficient crushing of lightweight / elastic materials, such as polyurethane insulation pipes, in a single shearing operation. Its specific functions are as follows: Waste polyurethane insulation pipe foam has the characteristics of low density, high bulkiness and strong toughness. If it is sheared by only a single set of blades, it is easy to have "incomplete tearing", such as only the surface is broken, while the inside is still large pieces or "uneven particles" and some materials fall without contacting the blades. The multi-layered blades are arranged in layers along the height of the crushing chamber 100, with at least 2-3 sets from top to bottom. After the material enters the crushing chamber 100 from the hopper 101, it will first come into contact with the upper movable blade 111 and stationary blade 112. At this time, the material volume is relatively large, and the gap between the upper movable blade 111 and stationary blade 112 is slightly wider to accommodate large pieces of material, first cutting the "large pieces of foam / insulation pipe fragments" into "medium pieces". Then the material falls to the middle movable blade 111 and stationary blade 112, where the gap is further reduced, cutting the "medium pieces" into "small pieces". Finally, it passes through the lower movable blade 111 and stationary blade 112, where the gap is the smallest to complete the "fine crushing", forming a step-by-step crushing process of "coarse crushing → medium crushing → fine crushing" to ensure that the final crushed particles are uniform. For example, polyurethane foam often needs to be crushed to 5-20mm particles to adapt to subsequent recycling and granulation.

[0024] In addition, if only a single set of movable knives 111 and static knives 112 is used to undertake all crushing tasks, the knives need to bear a huge shearing force, especially when processing the hard protective layer that may be contained in the outer layer of the insulation tube, which can easily cause problems such as blade edge collapse and shaft deformation. The multi-layered knives disperse the total shearing load to each set of movable knives 111 and static knives 112: the upper layer of movable knives 111 and static knives 112 mainly process the "large block, low hardness" foam body, and the load is relatively small; the lower layer of movable knives 111 and static knives 112 process "small block, may contain impurities" material, and the load is slightly larger, but the stress of each set of movable knives 111 and static knives 112 is more uniform, avoiding excessive wear of a single set of knives and prolonging the maintenance cycle of the knives.

[0025] Moreover, the lightweight foam material is easy to "drift" due to air flow or inertia when falling, and the contact range of a single set of knives is limited, so part of the material may bypass the knives and fall directly, i.e. "miss cutting". The multi-layered knives fully cover the height of the cavity, forming a "three-dimensional shearing net" - no matter from which angle the material falls, it will be captured and sheared by at least one layer of movable knives 111 and static knives 112, greatly reducing the miss cutting rate and improving the crushing efficiency.

[0026] The improvement lies in that the inner diameter of the crushing cavity 100 gradually decreases from high to low.

[0027] The radius of the crushing cavity 100, i.e. the distance between the cavity wall and the rotor axis, decreases from top to bottom. The essence is to match the "shearing gap gradient" of the multi-layered movable knives 111 and static knives 112 through "spatial gradient", while solving the problems of material accumulation and flow, with the specific effects as follows: Polyurethane foam is fluffy and elastic. If the cavity radius is consistent from top to bottom, i.e. straight cylinder type, the material is easy to accumulate at a certain layer, especially near the upper knives, due to "rebound" or "entanglement" during the shearing process, leading to "cavity top material blocking". The cavity radius decreases from top to bottom, forming a "wide at the top and narrow at the bottom" conical space: under the action of gravity, the material will naturally flow down along the gradually contracting cavity wall, while being "forcibly pulled into" the shearing zone by each layer of movable knives 111 and static knives 112 to avoid drifting, fundamentally reducing the risk of accumulation and ensuring the continuity of the crushing process. For example, for a device with a processing capacity of 100 kg / h, the blocking rate can be reduced from 15% for a straight cylinder cavity to less than 3% for a gradually changing cavity.

[0028] During the shearing crushing process, lightweight foam is easy to produce fine dust or debris. If the airflow in the cavity is turbulent, dust is easy to overflow from the feeding port and pollute the environment. The wide-to-narrow cavity of the crushing cavity 100 can form an "airflow negative pressure from top to bottom": the upper layer of wide space inhales air, and the lower layer of narrow space exhausts air. Dust is carried into the subsequent dust removal / collection system with the airflow, reducing the amount of dust on site and avoiding the loss of small material fragments from the feeding port.

[0029] In Figure 6 and Figure 7In the middle, the top edge of the grid 120 is provided with a fence, and the outer wall of the fence is fixedly connected with a limiting ring. The fence and the limiting ring are both slidingly connected to the inner wall of the side wall of the crushing cavity 100.

[0030] It should be noted that, compared with the outer limiting mode, i.e. the limiting ring is located in the inner space of the crushing cavity 100, in the middle Figure 7 The inner limiting mode of the limiting ring at the top of the grid 120 at T up and down sliding can avoid the phenomenon that the foam particles are stuck between the limiting ring and the inner side wall of the crushing cavity 100, affecting the smoothness of the grid 120 sliding up and down.

[0031] Based on the above description, the preferred effect of the baffle 200 will be explained below in combination with Figures 8-11 The baffle 200 is internally provided with a movable cavity 230, and the movable cavity 230 is internally provided with a plurality of free-sliding counterweight balls 240.

[0032] Furthermore, the mounting arm 210 is spaced apart on both sides away from the turnover channel 211 and is provided with a mounting groove 212, and the rotating shafts of the baffle 200 are all rotatingly connected in the mounting groove 212. The rotating shafts of the baffle 200 are all provided with a coil spring 220 around the two ends for limiting the position of the baffle 200 in the turnover channel 211, and the inner circle of the coil spring 220 is fixedly connected with the rotating shaft of the baffle 200.

[0033] Further, the bottom of the mounting groove 212 is in an open shape, and the mounting groove 212 is inserted with a buckle 213, and the mounting groove 212 and the top of the buckle 213 form a sliding space with a circular cross section. The mounting groove 212 adopts this structure of opening first and then sealing through the buckle 213, which is convenient for regular maintenance and maintenance of the state of the coil spring 220.

[0034] A pair of limiting grooves 214 are formed in the inner wall of the sliding space, and the outer peripheral end of the coil spring 220 is fixedly connected with a limiting block. The shape of the limiting block matches the limiting groove 214, one of which is located on the inner top wall of the mounting groove 212, and the other is located on the inner bottom wall of the buckle 213.

[0035] Further, the bottom of the crushing cavity 100 is fixedly and spacedly provided with a bottom plate 130 below the mounting arm 210, and a flotation tank 131 is provided between the top of the bottom plate 130 and the mounting arm 210. The inner wall of the crushing cavity 100 is coated with a polytetrafluoroethylene coating with a friction coefficient <0.1 to reduce the adhesion of the foam to the inner wall of the crushing cavity 100 and assist the downward sliding of the material.

[0036] In the working process, the movable cutter 111 and the static cutter 112 cut the polyurethane insulation pipe into particles, obtaining hard particles and soft particles. The hard particles are mainly metal particles and hard shell particles, hereinafter referred to as hard particles. The soft particles are mainly foam particles, and the amount of the soft particles is much larger than that of the hard particles. The density of the soft particles is much smaller than that of the hard particles.

[0037] The hard particles and the soft particles gradually fall to the top of the grid 120. Since the radius of the broken particles is smaller than the aperture of the grid 120, most of the particles pass through the grid 120 and fall to the top of the baffle 200 and gradually accumulate. Since the particles are randomly distributed after falling to the top of the grid 120, the gravity of the particles is difficult to balance on both sides of the rotating shaft of the baffle 200 at all times. However, before the difference in gravity of the particles on both sides of the rotating shaft of the baffle 200 exceeds the deformation resistance of the coil spring 220, the baffle 200 always remains horizontal in the overturning channel 211, thereby receiving the broken material and preventing it from splashing.

[0038] When the difference in gravity of the particles on both sides of the rotating shaft of the baffle 200 exceeds the deformation resistance of the coil spring 220, the balance of the baffle 200 in the overturning channel 211 is broken, and the baffle 200 tilts in the overturning channel 211. The rotating shaft drives the limiting block at the outer end of the coil spring 220 to slide out of one of the limiting grooves 214 and slide along the inner wall of the sliding space. At the same time, due to the tilting of the baffle 200, the counterweight ball 240 in the movable cavity 230 slides downward under the action of its own gravity, ensuring that the limiting block can slide into the next limiting groove 214. During this period, the baffle 200 rotates by 180°, thereby causing the broken material originally resting on the top of the baffle 200 to slide down to the lower flotation tank 131.

[0039] During the passage of the baffle 200 from the bottom of the grid 120, the edges of the baffle 200 drive the grid 120 to slide upward. After the edges of the baffle 200 move away from the bottom of the grid 120, the grid 120 naturally slides back to its original position under the action of its own gravity. This jolting process breaks the foam "bridge" on the top of the grid 120, allowing the clogged broken particles to fall from the breaking cavity 100 to the baffle 200 and then slide down from the tilted baffle 200 to the flotation tank 131.

[0040] After the particles slide into the flotation tank 131, they are stratified according to the difference in density between the soft particles and the hard particles. The metal particles sink to the bottom of the water in the flotation tank 131, while the foam particles and the plastic shells in the hard particles float on the surface of the water in the flotation tank 131. After being screened, both of them are convenient for subsequent recycling.

[0041] In summary, the working principle of the present application is as follows: Firstly, the waste polyurethane insulation pipe is put into the hopper 101, and under the joint action of the movable cutter 111 and the static cutter 112, the insulation pipe is sheared into granular.

[0042] The hard particles and the soft particles gradually fall to the top of the grid 120, and most of the particles fall through the grid 120 to the top of the baffle 200 and gradually gather. Before the gravity difference of the particles on both sides of the rotating shaft at the top of the baffle 200 exceeds the deformation resistance of the coil spring 220, the baffle 200 always remains horizontal in the turnover channel 211, and plays a role in receiving the broken materials and preventing them from splashing.

[0043] When the gravity difference of the particles on both sides of the rotating shaft at the top of the baffle 200 exceeds the deformation resistance of the coil spring 220, the balance of the baffle 200 in the turnover channel 211 is broken, so that the baffle 200 is inclined in the turnover channel 211, the limiting block at the peripheral end of the coil spring 220 slides out of one of the limiting grooves 214 and slides along the inner wall of the sliding space. At the same time, due to the inclination of the baffle 200, the counterweight ball 240 in the movable cavity 230 slides downward under the action of its own gravity, ensuring that the limiting block can slide into the next limiting groove 214, so as to slide the broken materials originally resting on the top of the baffle 200 to the lower flotation tank 131.

[0044] During the passage of the baffle 200 from the bottom of the grid 120, the edge of the baffle 200 drives the grid 120 to slide upward, and after the edge of the baffle 200 leaves the bottom of the grid 120, the grid 120 naturally slides downward to reset under the action of its own gravity, so that the broken particles that are blocked can all fall from the crushing cavity 100 to the baffle 200, and then slide from the inclined baffle 200 to the flotation tank 131.

[0045] After the particles slide into the flotation tank 131, they are stratified by the density difference between the soft particles and the hard particles. The metal particles sink to the bottom of the water in the flotation tank 131, while the foam particles and the plastic protective shells in the hard particles float on the surface of the water in the flotation tank 131. After screening, they are convenient for subsequent recycling.

[0046] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A polyhydroxyester insulation pipe waste foam crushing and screening recovery system, comprising a crushing device, the crushing device comprising a crushing cavity (100), a shearing knife group (110) is arranged inside the crushing cavity (100), and a grid (120) is arranged at the bottom of the shearing knife group (110), characterized in that: an installation arm (210) is fixedly connected to the outer bottom wall of the crushing cavity (100), a turnover channel (211) is formed below the grid (120), a baffle (200) for catching crushed materials to prevent them from splashing is rotatably connected in the turnover channel (211), and the center of gravity of the baffle (200) is not fixed. The grid (120) and the bottom of the shearing knife group (110) are slidably connected, when the plane of the baffle (200) is perpendicular to the plane of the turnover channel (211), the top of the baffle (200) is higher than the bottom of the grid (120) in a natural falling state. The shearing knife group (110) comprises movable knives (111) rotating around the axis of the crushing cavity (100) and static knives (112) fixedly connected to the inner side wall of the crushing cavity (100), the movable knives (111) and the static knives (112) are each provided with multiple layers according to a height gradient, and the number of layers of the movable knives (111) is the same as that of the static knives (112), and the movable knives (111) of the same layer are located above the static knives (112).

2. The polyhydroxyurethane insulation pipe waste foam shredding, screening, and recycling system of claim 1, wherein: A hopper (101) is arranged at the top of the crushing cavity (100), a mounting bracket is fixedly connected to the inner side wall of the hopper (101), a main rod is rotatably connected to the mounting bracket downward in the crushing cavity (100), the movable knives (111) of multiple layers are distributed along the axial direction of the main rod, and the movable knives (111) of the same layer are distributed along the radial direction of the main rod.

3. The polyurethane foam waste foam shredding and sorting recovery system of claim 2, wherein: The inner diameter of the crushing cavity (100) gradually decreases from high to low.

4. The polyurethane foam waste foam shredding and separating recycling system of claim 1, wherein: A surrounding fence is arranged at the top edge of the grid (120), a limiting ring is fixedly connected to the outer side wall of the surrounding fence, and the surrounding fence and the limiting ring are slidably connected to the inner side wall of the crushing cavity (100).

5. The polyurethane foam waste foam shredding and separating recycling system of claim 1, wherein: An active cavity (230) is formed in the baffle (200), and a plurality of free-sliding counterweight balls (240) are arranged in the active cavity (230).

6. The polyurethane foam waste foam shredding and separating recycling system of claim 1, wherein: Installation grooves (212) are formed at the two sides of the installation arm (210) away from each other, the rotating shafts of the baffles (200) are rotatably connected in the installation grooves (212), coil springs (220) for limiting the positions of the baffles (200) in the turnover channel (211) are arranged around the two ends of the rotating shafts of the baffles (200), and the inner rings of the coil springs (220) are fixedly connected to the rotating shafts of the baffles (200).

7. The polyurethane thermal tube waste foam shredding and separating recycling system of claim 1, wherein: The bottom of the installation groove (212) is open, a buckle (213) is inserted into the bottom of the installation groove (212), and a sliding space with a circular cross section is formed around the top of the installation groove (212) and the buckle (213).

8. The polyurethane thermal tube waste foam shredding and screening recovery system of claim 7, wherein: ​ 9. The polyurethane thermal tube waste foam shredding and screening recovery system of claim 8, wherein: The sliding space inner wall is provided with a pair of limiting grooves (214), the outer end of the coil spring (220) is fixedly connected with a limiting block, the shape of the limiting block is matched with the limiting grooves (214), one of the limiting grooves (214) is located on the inner top wall of the mounting groove (212), and the other limiting groove (214) is located on the inner bottom wall of the buckle (213).

10. The polyhydroxyurethane thermal pipe waste foam shredding, screening, and recycling system of claim 1, wherein: The bottom of the crushing cavity (100) is fixedly and spacedly provided with a bottom plate (130) below the mounting arm (210), a floating groove (131) is arranged between the top of the bottom plate (130) and the mounting arm (210), the inner wall of the crushing cavity (100) is coated with a polytetrafluoroethylene coating, and the friction coefficient is less than 0.1.

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