Energy-saving type PE cast film offcut smashing and recycling device

Abstract

The invention relates to the technical field of energy-saving smashing, and discloses an energy-saving PE cast film offcut smashing and recycling device which comprises a smashing machine, a feeding shell is installed at a feeding port of the smashing machine, a plurality of blades used for dividing offcuts are installed at the top of the feeding shell, and a plurality of sets of flywheels are symmetrically arranged on the two side faces of the feeding shell. According to the invention, the functions of offcut cutting, uniform dispersion and traction conveying are integrated in the transmission structure of the feeding shell, the unique inclined expansion layout of the conveying unit is matched with the precise matching of the blade and the conveying unit, the conveying efficiency is improved, and the production efficiency is improved. And meanwhile, due to the transmission design of gradually-changed teeth and gears of the tooth column, the speed difference of a transmission rope is compensated, the linear speed of each conveying unit is ensured to be consistent, and the problem that film edges are disordered and are difficult to uniformly feed is fundamentally solved.

Description

Technical Field

[0001] The invention relates to the technical field of energy-saving crushing, in particular to an energy-saving PE cast film edge material crushing and recovery device. Background Art

[0002] Cast film is a PE film produced by the cast film process. During the cast film production process, excess edge material will be generated on both sides of the film material. These edge materials are the cast film edges.

[0003] Although cast film edges are production waste, their chemical properties are consistent with those of finished PE films and they still have recycling value. After recycling, the cast film needs to be crushed and recycled back into production. On the other hand, if the film edges are directly discarded, their difficulty in natural degradation will cause white pollution and pollute the soil and water environment. At present, cast film edges have been crushed and recycled by intelligent manufacturing equipment, but there are the following problems in the crushing process.

[0004] Since the edges of the cast film are cut from both sides after the film is formed, at the moment of cutting, the film edges are separated from the main film. Due to their own flexibility, they are easily entangled and twisted under the influence of factors such as gravity and airflow. At the same time, most current collection equipment is difficult to achieve accurate and regular collection of the film edges. Further, the film edges gradually accumulate and entangle during winding, eventually forming a chaotic bundle.

[0005] After the chaotic film edges enter the crusher, they cannot be evenly distributed in the crushing area. When the film edges are concentrated in a certain local position of the crusher, the cutters, inner walls and other components in that position will be subjected to impact and friction far beyond normal levels. For example, in a traditional double-roll crusher, if the film edges accumulate near the knife roller, the knife roller will be subjected to excessive force in the high-speed rotation and cutting process, and the knife roller will wear and break faster. According to relevant test data, when processing chaotic film edges, the service life of the blade is shortened by about 30% to 40% compared to when processing uniform feeding, which greatly increases the maintenance frequency and replacement cost of the equipment, and reduces the overall service life of the equipment.

[0006] Secondly, when the film edges accumulate, the motor of the crusher needs to overcome greater resistance to maintain operation. For example, a crusher with a power of 10kW has an actual operating power of about 7-8kW when processing smooth and uniform cast film edges. However, when processing chaotic and twisted film edges, the actual operating power will soar to 9-9.5kW because the motor needs to constantly overcome the resistance caused by local overload, and the energy consumption will increase by about 12.5% ​​to 35.7%. Moreover, the uneven feeding makes the crushing process discontinuous and unstable, and the equipment needs to be frequently started and stopped for adjustment, which further consumes electricity. In the long run, it not only greatly increases the production cost of the enterprise, but also fails to solve the problem of energy-saving crushing of the motor in the crushing equipment.

[0007] To this end, the present invention proposes an energy-saving PE cast film edge material crushing and recovery device. Summary of the Invention

[0008] The object of the present invention is to provide an energy-saving PE cast film edge material crushing and recovery device to solve the problems raised in the above background technology.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an energy-saving PE cast film edge material crushing and recovery device, comprising a crusher, a feeding shell is installed at the feed port of the crusher, a plurality of blades for cutting the edge material are installed on the top of the feeding shell, a plurality of groups of flywheels are symmetrically arranged on both sides of the feeding shell, each group of flywheels includes two flywheels arranged in an upper and lower opposite position, two transmission ropes are wound around the surface of each group of flywheels, and limiting shells for constraining the path of the transmission rope are installed on the inner and outer surfaces of the feeding shell. The two groups of flywheels on both sides of the feeding shell and the transmission ropes on their surfaces together constitute a conveying unit, and the four transmission ropes in each conveying unit form a four-way clamping structure for the edge material. A driver is installed on the outside of the crusher, and the driver is used to drive the flywheel at the bottom to rotate;

[0010] The conveying unit located on the center line of the feeding shell is arranged vertically, and the other conveying units are arranged symmetrically and inclined to expand on both sides along the center line, and the distance between the flywheels on the top side remains consistent, and the flywheels at the bottom are all kept parallel and located on the same axis;

[0011] The diameter of the transmission rope is greater than the edge thickness of the flywheel to form an effective covering contact surface for the edge material;

[0012] Under the action of the driver, the transmission ropes on both sides of the feeding shell run synchronously in opposite directions, forming a clamping and conveying force on the multiple edge materials after being cut by the blades, realizing the feeding function of separating the edge materials from one bundle into multiple bundles and gradually expanding the spacing.

[0013] Preferably, the bottom of the feeding shell is symmetrically provided with empty grooves, and tooth columns are rotatably connected in the empty grooves, the flywheel surface located on the bottom side is fixedly connected with a gradient gear meshing with the tooth column, the gradient gear and the bottom flywheel are rotatably connected to the inside of the crusher, the flywheel located on the upper side of the feeding shell is rotatably connected to the surface of the feeding shell, and the transmission ropes are slidably connected to the inside of the limit shell.

[0014] Preferably, the gear column is provided with a meshing area with a gradually changing number of teeth along the axial direction. Taking the gradually changing gear in the middle as a reference, the number of teeth of the gradually changing gears adjacent on both sides gradually increases toward both sides. By meshing with the corresponding areas of the gear column, a decreasing transmission ratio is formed, thereby compensating for the longer movement path of the outer transmission rope and ensuring the synchronization of the linear speeds of each conveying unit.

[0015] Preferably, a knife holder is fixedly connected to the top of the feeding shell, and the blades are fixedly connected to the knife holder. At the same time, the blades are arranged in a direction perpendicular to the connecting line between the front and rear flywheels and are located at the center of the connecting line.

[0016] Preferably, notch grooves are provided in the middle of both sides of the tool holder, and the notch grooves facilitate the smooth placement of the edge materials into the conveying unit to reduce the obstruction of material discharge.

[0017] Preferably, the driver comprises two driven gears fixedly connected to the outer side of the gear column, a driving gear rotatably connected to the bottom side wall of the feeding housing, and a motor fixedly connected to the outer wall of the grinder and with its output end connected to the driving gear;

[0018] The driving gear is engaged with the driven gears on both sides at the same time. The motor drives the driving gear to rotate, so that the driven gears on both sides drive the gear columns to rotate in opposite directions, thereby driving the transmission units on both sides of the feeding shell to run synchronously in opposite directions, forming a clamping and conveying force for the edge material.

[0019] Preferably, the transmission rope is made of a flexible composite material, specifically including but not limited to a steel wire rope with a rubber layer coated on the surface. This material can achieve stable transmission through friction when the flywheel rotates, and at the same time use the elastic modulus to adapt to the curvature change of the conveying path to ensure damage-free clamping and conveying of the PE film.

[0020] Preferably, the upper and lower ends of the limit shell are arranged perpendicular to the bottom wall of the feeding shell. The vertical section of the limit shell ensures that the transmission rope maintains a vertical contact angle with the edge material when entering and exiting the conveying unit, avoiding excessive distortion caused by changes in the transmission structure angle.

[0021] Preferably, the number of the blades is one less than the number of groups of conveying units, and a blade is provided between each two adjacent groups of conveying units. Except for the bottom portion fixedly connected to the blade holder, the rest of the blade edge is sharpened.

[0022] Preferably, the rated output power of the driver matches the working power of the grinder, and the two are synchronously regulated through a control system.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] Innovative integration advantages: The present invention integrates the functions of edge material segmentation, uniform dispersion and traction conveying into the transmission structure of the feeding shell. The unique inclined expansion layout of the conveying unit, combined with the precise ratio of the blade and the conveying unit, realizes the orderly separation and spacing expansion of the edge materials from a single bundle to multiple bundles. At the same time, the transmission design of the tooth column with gradual tooth changes and the gear compensates for the speed difference of the transmission rope, ensuring the consistency of the linear speed of each conveying unit, and solving the problem of uniform feeding of chaotic film edges from the root. The uniform feeding can achieve the effect of uniform force on the motor in this equipment and energy-saving crushing.

[0025] Significant energy-saving advantage: The uniform feeding design makes the motor load more stable when the crusher is running. Compared with the traditional equipment that causes a surge in energy consumption due to local overload, this device can reduce the crusher's operating power with its precise transmission control and stable feeding state.

[0026] Equipment maintenance advantages: Uniform feeding avoids excessive wear of local parts of the crusher and avoids local stress, thereby realizing energy-saving operation of the motor. Traditional equipment shortens the blade life by 30% to 40% due to film edge accumulation. This device uses the four-way clamping transmission rope and the path constraint of the limit shell to make the edge material evenly stressed, greatly reducing the wear rate of key components such as the knife roller, reducing the frequency of shutdown and maintenance, reducing maintenance costs and manpower investment, and ensuring continuous and stable production.

[0027] Advantages of improving production efficiency: Multiple groups of conveying units work together, combined with the synchronous segmentation and conveying functions of the edge materials, to achieve efficient connection from feeding to crushing. When processing large quantities of edge materials, there is no need for manual pre-sorting. The device can directly and orderly convey the chaotic bundles of film edges. Compared with the traditional method of manually assisted feeding, the stable feeding state keeps the crusher in the efficient working range, further shortening the overall processing time, thereby reducing the motor load and achieving energy-saving motor-driven crushing effect.

[0028] Advantages of simplified structure: This device integrates the traditional independent traction mechanism and feeding dispersion function, reducing additional mechanical components and complex transmission structures. The streamlined equipment layout reduces manufacturing costs, reduces equipment footprint and installation and debugging complexity. The modular design makes it easy to quickly disassemble and replace key components such as transmission ropes and blades, reducing maintenance difficulty and significantly improving the equipment's full life cycle management efficiency. More importantly, the present invention fills the technical gaps in traditional traction mechanisms in terms of uniform feeding, energy saving and consumption reduction through the above structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front perspective schematic diagram of the main structure of the present invention;

[0030] Figure 2 It is a partially cutaway perspective schematic diagram of the main structure of the present invention;

[0031] Figure 3 For the present invention Figure 2 A in the middle is an enlarged schematic diagram of the structure;

[0032] Figure 4 It is a three-dimensional schematic diagram of the feeding housing of the present invention;

[0033] Figure 5 For the present invention Figure 4 The enlarged three-dimensional schematic diagram of the structure at B in the middle;

[0034] Figure 6 It is a schematic perspective cutaway diagram of a flywheel and a gradient gear of the present invention;

[0035] Figure 7 For the present invention Figure 6 The enlarged three-dimensional schematic diagram of the structure at C in the middle;

[0036] Figure 8 This is a schematic perspective cutaway view of a tooth column according to the present invention;

[0037] Figure 9 It is a top plan view of the feeding housing, transmission rope and blade of the present invention.

[0038] In the picture:

[0039] 11. Crusher.

[0040] 21. Feeding housing; 211. Limiting housing; 212. Gear column; 213. Tool holder; 22. Transmission rope; 23. Flywheel; 231. Gradient gear; 24. Blade; 25. Driver. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] It should be noted that the driver 25 only provides the function of opposite rotation of the tooth columns 212 on both sides, and the crusher 11 only provides the function of crushing the edge materials. The working principle and specific structure of the above structure are both existing technologies. Therefore, in view of the versatility of the above structure, its specific principle will not be repeated later.

[0043] See also Figures 1 to 9 , the present invention provides two embodiments:

[0044] Example 1:

[0045] The invention relates to an energy-saving PE cast film scrap crushing and recovery device, comprising a crusher 11, a feeding shell 21 is installed at the feed port of the crusher 11, a plurality of blades 24 for cutting scrap are installed on the top of the feeding shell 21, a plurality of groups of flywheels 23 are symmetrically arranged on both sides of the feeding shell 21, each group of flywheels 23 includes two flywheels 23 arranged in an upper and lower position, two transmission ropes 22 are wound around the surface of each group of flywheels 23, and a limiting shell 211 for constraining the path of the transmission rope 22 is installed on the inner and outer surfaces of the feeding shell 21, and the limiting shell 211 extends from the upper part to the lower part of the feeding shell 21, the two groups of flywheels 23 on both sides of the feeding shell 21 and the transmission ropes 22 on the surface thereof together constitute a conveying unit, and the four transmission ropes 22 in each conveying unit form a four-way clamping structure for the scrap, and a driver 25 is installed on the outside of the crusher 11, and the driver 25 is used to drive the flywheel 23 at the bottom to rotate;

[0046] The conveying unit located on the center line of the feeding shell 21 is arranged vertically, and the other conveying units are arranged symmetrically and inclined to expand on both sides along the center line, and the spacing between the flywheels 23 on the top side is kept consistent, and the flywheels 23 at the bottom are kept parallel and located on the same axis;

[0047] The diameter of the transmission rope 22 is larger than the edge thickness of the flywheel 23 to form an effective covering contact surface for the edge material;

[0048] Under the action of the driver 25, the transmission ropes 22 on both sides of the feeding shell 21 run synchronously in opposite directions, forming a clamping and conveying force on the multiple edge materials cut by the blade 24, realizing the feeding function of separating the edge materials from one bundle into multiple bundles and gradually increasing the spacing.

[0049] It should be noted that the bottom of the feeding shell 21 is symmetrically provided with empty slots, and the empty slots are rotatably connected with tooth columns 212, and the surface of the flywheel 23 located on the bottom side is fixedly connected with a gradient gear 231 meshing with the tooth column 212, and the gradient gear 231 and the bottom flywheel 23 are both rotatably connected to the inside of the crusher 11, and the flywheel 23 located on the upper side of the feeding shell 21 is rotatably connected to the surface of the feeding shell 21, and the transmission rope 22 is slidably connected to the inside of the limit shell 211, and the tooth column 212 is provided with a meshing area with a gradually changing number of teeth along the axial direction. With the gradually changing gear 231 in the middle as a reference, the number of teeth of the adjacent gradually changing gears 231 on both sides gradually increases toward the two sides. By meshing with the corresponding area of ​​the tooth column 212, a decreasing transmission ratio is formed, thereby compensating for the longer movement path of the outer transmission rope 22 and ensuring the synchronization of the linear speed of each conveying unit. The top of the feeding shell 21 is fixedly connected to the knife holder 213, and the blades 24 are fixedly connected to the knife holder 213. At the same time, the blades 24 are arranged in a direction perpendicular to the connecting line of the front and rear flywheels 23 and are located at the center of the connecting line. A notch groove is provided in the middle of both sides of the knife holder 213. The notch groove facilitates the smooth placement of the edge material into the conveying unit to reduce the obstruction of material discharge. The driver 25 includes two driven gears fixedly connected to the outside of the tooth column 212 and a driven gear rotatably connected to the feeding shell. The driving gear on the bottom side wall of the body 21, and the motor fixedly connected to the outer wall of the crusher 11 and the output end connected to the driving gear; the driving gear is engaged with the driven gears on both sides at the same time, and the motor drives the driving gear to rotate, so that the driven gears on both sides drive the tooth columns 212 to rotate in the opposite direction, thereby driving the transmission units on both sides of the feeding shell 21 to run synchronously in opposite directions, forming a clamping and conveying force for the edge material, and the transmission rope 22 is a flexible composite material, specifically but not limited to a steel wire rope with a rubber layer on the surface. This material can achieve stable transmission through friction when the flywheel 23 rotates, and at the same time uses the elastic modulus to adapt to the curvature change of the conveying path to ensure that the PE The film is clamped and conveyed without damage, and the upper and lower ends of the limit shell 211 are arranged perpendicular to the bottom wall of the feeding shell 21. The vertical section of the limit shell 211 ensures that the transmission rope 22 maintains a vertical contact angle with the edge material when entering and exiting the conveying unit, avoiding excessive distortion caused by changes in the angle of the transmission structure. The number of blades 24 is one less than the number of groups of conveying units, and a blade 24 is arranged between each two adjacent groups of conveying units. Except for the bottom part of the blade 24 that is fixedly connected to the tool holder 213, the rest of the blade part is sharpened. The rated output power of the driver 25 matches the working power of the crusher 11, and the two are synchronized and regulated through the control system.

[0050] Specifically, when crushing a single PE film scrap, the operator holds one end of the scrap and presses it on the blade 24, and then the blade 24 divides the scrap into several parts.

[0051] The operator places the edges of each portion of the cut edge material accurately between the four transmission ropes 22 of the corresponding conveying unit.

[0052] Then, the driver 25 and the crusher 11 are started, and the motor drives the driving gear to rotate, which drives the tooth column 212 to rotate in the opposite direction by meshing with the driven gears on both sides. The rotation of the tooth column 212 drives the gradient gear 231 and the bottom flywheel 23 meshing with it to rotate in turn, and then drives the upper flywheel 23 to rotate synchronously through the transmission rope 22. Since the rotation directions of the flywheels 23 on the front and rear sides of the same conveying unit are opposite, the four transmission ropes 22 form a reverse clamping conveying force, which stably conveys the cut edge materials downward.

[0053] During the conveying process, the conveying units located on both sides of the center line of the feeding shell 21 are arranged in an inclined expansion manner, and the movement path of the outer transmission rope 22 is longer. At this time, the tooth column 212 has a gradually changing meshing area with a number of teeth arranged axially, which meshes with the gradually changing gear 231 with a gradually increasing number of teeth on both sides, forming a decreasing transmission ratio, ensuring that the outer transmission rope 22 runs at a faster speed and keeps a synchronous conveying progress with the middle conveying unit.

[0054] The vertical section design of the limiting shell 211, combined with the flexible composite material characteristics of the transmission rope 22, effectively ensures the stability of transportation. Specifically, the transmission rope 22 can adapt to the curvature changes of the conveying path while conforming to the curved surface of the flywheel 23. Compared with rigid chain drive or belt drive, the flexible characteristics of rope drive can avoid stress concentration caused by angle changes, and prevent the edge material from twisting and deforming due to uneven force during transportation; at the same time, the low inertia characteristics of rope drive reduce the energy consumption during startup and operation, and its multi-point contact clamping method is more uniform and stable than traditional single-point traction.

[0055] Finally, the edge material clamped by the transmission rope 22 enters the inclined expansion area after passing through the vertical section. Under the coordinated traction of the four transmission ropes 22, the distance between each part of the edge material gradually expands. Due to the constraint of the vertical section of the limiting shell 211 on the path of the transmission rope 22, the edge material always maintains a vertical contact angle with the transmission rope 22, ensuring stable transportation to the vertical section below. In this process, the continuously running transmission rope 22 continuously pulls the edge material at the rear, so that it is continuously cut by the blade 24 while being stably restricted.

[0056] Finally, the evenly dispersed scraps smoothly enter the crusher 11 and are crushed efficiently.

[0057] It should be noted that this design integrates the functions of the traditional traction mechanism that require additional configuration into the conveying unit. Through the coordinated movement of the transmission rope 22 and the flywheel 23, it not only realizes the traction and transportation of the PE film edge material, but also achieves the uniform distribution of the edge material at the feeding port of the crusher 11. Compared with the existing technology, it avoids local overload caused by edge material accumulation, reduces the ineffective idling time of the crusher 11, and reduces the overall energy consumption. At the same time, there is no need to set up an additional traction device, which significantly improves the energy-saving efficiency and working stability of the crushing and recovery of PE cast film edge material.

[0058] Example 2, based on Example 1:

[0059] Specifically, during the large-scale crushing process, the operator can place multiple bundles of uneven and chaotic PE film scraps directly between the four transmission ropes 22 of each conveying unit. At this time, the blade 24 can serve as a guide component to assist the scraps to enter the conveying area, and can also be disassembled according to actual needs.

[0060] After starting the driver 25 and the crusher 11, the transmission system operates synchronously according to the principle of embodiment 1, and the four-way transmission rope 22 forms a stable clamp for the edge material. Since the transmission rope 22 is made of a flexible composite material, the friction between its surface rubber layer and the edge material can provide sufficient traction driving force and avoid damage to the edge material.

[0061] During the conveying process, the vertical section constraint of the limit shell 211 ensures that the transmission rope 22 always maintains a vertical contact angle with the edge material. Even if the edge material is initially chaotic, it can maintain its original shape during the conveying process and be guided to the feed port of the crusher 11 in an orderly manner.

[0062] Compared with the existing technology in which a large amount of side materials are directly fed into the machine and cause chaotic accumulation, this design uses the stable guidance of the transmission rope 22 to allow the side materials to enter the crushing area in a relatively regular state, avoiding local overload and wear of the blade of the crusher 11 due to local concentrated feeding. At the same time, the four-way clamping structure of the conveying unit is combined with the gradual transmission ratio design of the tooth column 212 to ensure that each bundle of side materials is conveyed synchronously at a uniform speed, further optimizing the uniformity of the feeding distribution. This uniform feeding method effectively reduces the load fluctuation of the crusher 11, reduces the additional energy consumption caused by frequent local overloads, extends the service life of the equipment, and improves the crushing efficiency and energy utilization efficiency.

[0063] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0064] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving PE cast film edge material crushing and recovery device, comprising a crusher (11), characterized in that: A feeding shell (21) is installed at the feed port of the crusher (11), and a plurality of blades (24) for cutting the edge materials are installed on the top of the feeding shell (21). A plurality of groups of flywheels (23) are symmetrically arranged on both sides of the feeding shell (21), and each group of flywheels (23) includes two flywheels (23) arranged in an upper and lower position. Two transmission ropes (22) are wound around the surface of each group of flywheels (23). A limiting shell (211) for constraining the path of the transmission rope (22) is installed on the inner and outer surfaces of the feeding shell (21). The two groups of flywheels (23) on both sides of the feeding shell (21) and the transmission ropes (22) on the surface thereof together constitute a conveying unit. The four transmission ropes (22) in each conveying unit form a four-way clamping structure for the edge materials. A driver (25) is installed on the outside of the crusher (11), and the driver (25) is used to drive the flywheel (23) located at the bottom to rotate. The conveying unit located on the center line of the feeding shell (21) is arranged vertically, and the other conveying units are arranged symmetrically and tilted to both sides along the center line, and the spacing between the flywheels (23) on the top side remains consistent, and the flywheels (23) at the bottom are all kept parallel and located on the same axis.

2. The energy-saving PE cast film edge material crushing and recovery device according to claim 1, characterized in that: The bottom of the feeding housing (21) is symmetrically provided with empty slots, and tooth columns (212) are rotatably connected in the empty slots. The surface of the flywheel (23) located on the bottom side is fixedly connected with a gradient gear (231) meshing with the tooth column (212). The gradient gear (231) and the bottom flywheel (23) are rotatably connected to the inside of the crusher (11). The flywheel (23) located on the upper side of the feeding housing (21) is rotatably connected to the surface of the feeding housing (21), and the transmission rope (22) is slidably connected to the inside of the limit shell (211).

3. The energy-saving PE cast film edge material crushing and recovery device according to claim 2, characterized in that: The tooth column (212) is provided with a meshing area with a gradually changing number of teeth along the axial direction. Taking the gradually changing gear (231) in the middle as a reference, the number of teeth of the gradually changing gears (231) adjacent to the tooth column (212) gradually increases in the direction of both sides. By meshing with the corresponding area of ​​the tooth column (212), a decreasing transmission ratio is formed, thereby compensating for the longer movement path of the outer transmission rope (22) and ensuring the synchronization of the linear speed of each conveying unit.

4. The energy-saving PE cast film edge material crushing and recovery device according to claim 1, characterized in that: The top of the feeding shell (21) is fixedly connected to a knife holder (213), and the blades (24) are fixedly connected to the knife holder (213). At the same time, the blades (24) are arranged in a direction perpendicular to the connecting line of the front and rear flywheels (23) and are located at the center of the connecting line.

5. The energy-saving PE cast film edge material crushing and recovery device according to claim 4, characterized in that: The middle parts of both sides of the tool holder (213) are provided with notches, which facilitate the smooth placement of the edge material into the conveying unit to reduce the obstruction of material discharge.

6. The energy-saving PE cast film edge material crushing and recovery device according to claim 3, characterized in that: The driver (25) includes two driven gears fixedly connected to the outside of the gear column (212), a driving gear rotatably connected to the bottom side wall of the feeding housing (21), and a motor fixedly connected to the outer wall of the pulverizer (11) and with its output end connected to the driving gear; The driving gear is simultaneously engaged with the driven gears on both sides, and the motor drives the driving gear to rotate, so that the driven gears on both sides drive the gear columns (212) to rotate in opposite directions, thereby driving the transmission units on both sides of the feeding shell (21) to run synchronously in opposite directions, forming a clamping and conveying force for the edge material.

7. The energy-saving PE cast film edge material crushing and recovery device according to claim 1, characterized in that: The transmission rope (22) is made of a flexible composite material.

8. The energy-saving PE cast film edge material crushing and recovery device according to claim 2, characterized in that: The upper and lower ends of the limiting shell (211) are both arranged perpendicular to the bottom wall of the feeding shell (21). The vertical section of the limiting shell (211) ensures that the transmission rope (22) maintains a vertical contact angle with the edge material when entering and exiting the conveying unit, thereby avoiding excessive distortion caused by changes in the transmission structure angle.

9. The energy-saving PE cast film edge material crushing and recovery device according to claim 1, characterized in that: The number of the blades (24) is one less than the number of groups of conveying units, and a blade (24) is provided between each two adjacent groups of conveying units. Except for the bottom portion fixedly connected to the blade holder (213), the rest of the blade portion of the blade (24) is sharpened.

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