A low-speed plastic pulverizer cutter roll assembly

Abstract

The application relates to the technical field of plastic crushing, in particular to a low-speed plastic crusher cutter roll assembly which comprises a frame, a fixed cutter unit fixedly arranged in the frame, a movable cutter unit rotatably assembled in the frame, and a synchronous driving mechanism arranged on the outside of the frame. The fixed cutter unit and the movable cutter unit are arranged in a shearing cooperation in the circumferential direction. The fixed cutter unit and the frame are in a sliding guide cooperation in the linear direction. The fixed cutter unit is arranged to be slidable in the frame. The synchronous driving mechanism is matched to realize accurate gap adjustment. The device can flexibly adjust the shearing parameters according to different material types, hardness or yield requirements, significantly improves the universality and adaptability of the device, and solves the problem that the crushing effect is deteriorated due to the increased gap caused by the wear of the fixed cutter in the traditional device.

Description

Technical Field

[0001] This invention relates to the field of plastic crushing technology, and more particularly to a low-speed plastic crusher cutter roller assembly. Background Technology

[0002] Low-speed plastic crushers are key equipment in the recycling and processing of waste plastics. Their core working component is the cutter roller assembly, which crushes plastic materials to the required particle size through the shearing action between the rotating moving blades and the fixed blades.

[0003] In traditional cutter roller assemblies, the fixed blade is typically fixed to the frame by bolts or welding. The shearing gap between the moving and fixed blades is adjusted at the factory and cannot be adjusted online during use. However, with long-term operation, the cutting edges of both the moving and fixed blades inevitably wear down, causing the shearing gap to gradually increase. This leads to a deterioration in crushing efficiency, coarser output particle size, and even situations where materials cannot be effectively cut, causing equipment blockage. In such cases, it is necessary to stop the machine, disassemble the fixed blade for re-grinding or adjustment with shims. This maintenance is time-consuming, labor-intensive, and severely restricts production continuity. Furthermore, different plastic materials, such as soft PE, rigid PVC, and high-toughness PA, have significantly different requirements for shearing gaps, and the fixed gap structure limits the equipment's versatility.

[0004] Therefore, in order to solve the above problems, we propose a low-speed plastic crusher cutter roller assembly. Summary of the Invention

[0005] The purpose of this invention is to solve the shortcomings of existing technologies, such as the need to stop the machine to disassemble the fixed blade for grinding or adding shims for adjustment, which results in long maintenance time and high labor intensity. Therefore, this invention proposes a low-speed plastic crusher blade roller assembly.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: Design a low-speed plastic shredder cutter roller assembly, including: A frame, within which a fixed blade unit is fixedly installed; The moving blade unit is rotatably assembled inside the frame, and the moving blade unit and the fixed blade unit are arranged opposite each other in the circumferential direction to form a shearing engagement; The fixed tool unit and the frame form a sliding guide engagement along a straight line. The frame is provided with a synchronous drive mechanism on its exterior, which is used to drive the fixed tool unit to perform linear feed motion. A filter screen is also provided on the inner side of the frame, and below the moving blade unit.

[0007] Furthermore, the moving blade unit includes: A power shaft passing through the frame; The power shaft is connected to an external drive source, and several moving cutter heads are fixedly installed on the outside of the power shaft.

[0008] Furthermore, the fixed-blade unit includes: A number of fixed cutter discs are attached in sequence, and multiple guide rods are passed through the end faces of the fixed cutter discs. Guide grooves are opened on both sides of the frame to accommodate the sliding of the guide rods. A shearing opening for accommodating one moving cutter disc is constructed between two adjacent fixed cutter discs.

[0009] Furthermore, an air passage is formed inside the power shaft, and several air blowing holes communicating with the air passage are opened on the outside of the power shaft. The air blowing holes are located between two adjacent moving cutter discs, and a connector communicating with the air passage is also installed at one end of the power shaft.

[0010] Furthermore, the synchronous drive mechanism includes: Support frames are fixedly installed on both sides of the frame; A slide block is slidably connected to the inner side of the support frame, and a connector is fixedly connected between the slide block and the guide rod on the same side. A drive component that connects to the slide block is also installed on the end face of the support frame.

[0011] Furthermore, the synchronous drive mechanism also includes: A rack is fixedly installed on the side of the slide block; A synchronous shaft is rotatably connected between the two support frames, and gears are fixedly installed at both ends of the synchronous shaft. The gears mesh with the rack for transmission.

[0012] Furthermore, two locking shafts are inserted through the side of the frame, and the locking shafts are movably inserted into the filter screen. The two ends of the locking shafts are respectively formed with a stop part and a spring plug.

[0013] Furthermore, the locking shaft is equipped with a sleeve at the end of the spring plug, and a positioning hole adapted to the spring plug is opened on the end face of the sleeve. A swing structure is provided between the sleeve and the power shaft.

[0014] Furthermore, the swing structure includes: An eccentric bushing is installed on the outside of the power shaft. Two connecting arms are fixedly installed on the outer shell of the eccentric bushing. A swing arm is fixedly installed on the side of the sleeve. A sliding groove is opened on the end face of the swing arm. A guide shaft that slides in the sliding groove is fixedly installed on the end face of the connecting arm.

[0015] Furthermore, a plurality of striking rods are threadedly connected to the end face of the locking shaft, and a striking head is fixedly connected to the end of each striking rod.

[0016] The present invention proposes a low-speed plastic crusher cutter roller assembly, which has the following advantages: By setting the fixed blade unit as a structure that can slide and adjust within the frame, and cooperating with the synchronous drive mechanism to achieve precise gap adjustment, the equipment can flexibly adjust the shearing parameters according to different material types, hardness, or output requirements, significantly improving the versatility and adaptability of the equipment. At the same time, it solves the problem of the crushing effect deterioration caused by the increased gap after the fixed blade wears in traditional equipment. By setting a filter screen below the moving blade unit, online screening of qualified and unqualified particles is realized, ensuring the uniformity of the output particle size and avoiding clogging or product quality problems caused by excessive particle size in subsequent processes. Attached Figure Description

[0017] Figure 1 The three-dimensional representation of the present invention Figure 1 ; Figure 2 The three-dimensional representation of the present invention Figure 2 ; Figure 3 This is a top view of the present invention; Figure 4 This is a cross-sectional view of the frame of the present invention; Figure 5 This is a schematic diagram of the fixed-blade unit structure of the present invention; Figure 6 This is a schematic diagram of the fixed-blade unit structure of the present invention; Figure 7 for Figure 6 A magnified structural diagram of area A; Figure 8 This is a schematic diagram of the swing structure of the present invention; Figure 9 This is a schematic diagram of the striking head structure of the present invention.

[0018] In the diagram: 1. Frame; 2. Fixed blade unit; 21. Fixed blade disc; 22. Guide rod; 23. Shearing port; 3. Moving blade unit; 31. Power shaft; 32. Moving blade disc; 33. Air passage; 34. Air blowing hole; 35. Connector; 4. Synchronous drive mechanism; 41. Support frame; 42. Slide; 43. Connector; 44. Drive component; 45. Rack; 46. Synchronous shaft; 47. Gear; 5. Filter screen; 6. Locking shaft; 61. Stop part; 62. Spring plug; 63. Sleeve; 64. Swing structure; 641. Eccentric bushing; 642. Connecting arm; 643. Swing arm; 644. Slide groove; 645. Guide shaft; 65. Striking rod; 66. Striking head. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Reference Figures 1-9 As one embodiment of the present invention, a low-speed plastic shredder cutter roller assembly is disclosed, specifically the cutter roller assembly comprising: Frame 1, wherein a fixed blade unit 2 is fixedly installed inside the frame 1; The moving blade unit 3 is rotatably assembled inside the frame 1, and the moving blade unit 3 and the fixed blade unit 2 are arranged opposite each other in the circumferential direction to form a shearing engagement; The frame 1 serves as the supporting base for the entire cutter roller assembly, and its interior forms a closed crushing chamber. The fixed cutter unit 2 is fixedly installed in the guide groove on the inner side wall of the frame 1, while the moving cutter unit 3 is rotatably supported on the left and right side walls of the frame 1 by bearing seats at both ends. The moving cutter unit 3 rotates at high speed under the drive of an external motor, while the fixed cutter unit 2 remains stationary, and the two form a fixed shearing angle in the circumferential direction. When plastic material falls into the crushing chamber from the feed inlet at the top of the frame 1, the rotating moving cutter unit 3 and the stationary fixed cutter unit 2 generate a shearing action, crushing the material. The fixed blade unit 2 and the frame 1 form a sliding guide fit along a straight line. The frame 1 is provided with a synchronous drive mechanism 4 on its outside. The synchronous drive mechanism 4 is used to drive the fixed blade unit 2 to make a linear feed motion. When the synchronous drive mechanism 4 is activated, the fixed blade unit 2 moves linearly along the radial direction of the frame 1, thereby accurately adjusting the shearing gap between the fixed blade unit 2 and the moving blade unit 3.

[0021] This structure allows operators to adjust the shearing gap in real time based on material characteristics or blade wear without disassembling the equipment, ensuring optimal crushing results. The synchronous drive mechanism 4 ensures that the displacement of all parts of the fixed blade unit 2 along its length is completely consistent during feeding, avoiding skewness or jamming of the fixed blade unit 2 caused by unilateral drive. This ensures that the gap between the fixed blade and the moving blade is uniform throughout the entire length, preventing the phenomenon of a large gap at one end and a small gap at the other. In addition, a filter screen 5 is provided on the inner side of the frame 1, below the moving blade unit 3. The filter screen 5 is an arc-shaped plate structure, with a predetermined distance between its inner arc surface and the outer peripheral surface of the moving blade unit 3. The filter screen 5 has multiple sieve holes for qualified particles to pass through after crushing. During the crushing process, the moving blade unit 3 and the fixed blade unit 2 work together to crush the material. The crushed particles fall to the filter screen 5 under the action of gravity. Qualified particles with a particle size smaller than the sieve hole size pass through the filter screen 5 and are discharged, while unqualified particles with a particle size larger than the sieve hole size are intercepted by the filter screen 5 and thrown back into the shearing area for secondary crushing under the rotation of the moving blade unit 3 until the particle size meets the requirements before it can pass through the filter screen 5 and be discharged, thereby ensuring the uniformity and controllability of the output particle size.

[0022] Reference Figure 3 , Figure 5 In some embodiments, the moving blade unit 3 of the present invention includes: A power shaft 31 passing through the inside of the frame 1; The power shaft 31 is connected to an external drive source. Several moving cutter heads 32 are fixedly installed on the outside of the power shaft 31. The axis of the power shaft 31 extends horizontally and is consistent with the length direction of the frame 1. Both ends of the power shaft 31 extend outside the frame 1, and one end is used to connect to an external drive source such as a motor and a reducer.

[0023] The drive shaft 31 and the frame 1 are rotated together by a self-aligning roller bearing in the bearing housing. This bearing can withstand the radial load generated when the drive shaft 31 rotates, as well as the axial impact load generated when the cutter head shears the material, thus ensuring the rotational accuracy and operational stability of the drive shaft 31 under heavy load conditions.

[0024] When the external drive source drives the power shaft 31 to rotate, the power shaft 31 drives all the moving cutter discs 32 to rotate synchronously. The cutting teeth on the outer periphery of each moving cutter disc 32 pass through the cutting edge position of the fixed cutter disc 21 in sequence. At the moment of their intersection, a strong shearing action is formed, cutting and crushing the plastic material clamped between the moving cutter disc 32 and the fixed cutter disc 21. The structure of multiple moving cutter discs 32 arranged at intervals along the axial direction makes the entire cutter roller form multiple independent shearing stations in the axial direction. Each shearing station simultaneously shears and crushes the material, which greatly improves the crushing efficiency and the processing capacity per unit time.

[0025] Reference Figure 5 In an optional embodiment, the fixed-blade unit 2 includes: A number of fixed cutter discs 21 are attached in sequence, and multiple guide rods 22 are passed through the end faces of the fixed cutter discs 21. Guide grooves adapted to the sliding of the guide rods 22 are opened on both sides of the frame 1. The cross-sectional shape of the guide groove is adapted to the outer diameter of the guide rod 22, so that the guide rod 22 can only slide along the length direction of the guide groove, while the movement in other directions is constrained. Both ends of each guide rod 22 extend into the corresponding guide groove, supporting the entire fixed blade unit 2 on the frame 1. This allows the fixed blade unit 2 to reciprocate linearly along the radial direction of the frame 1 under the guidance of the guide groove. A shearing opening 23 is constructed between two adjacent fixed blade discs 21 to accommodate one movable blade disc 32. Specifically, since the end faces of two adjacent fixed blade discs 21 are in contact with each other, a narrow gap with a width equal to the thickness of the fixed blade disc 21 is formed between them. This gap is the shearing opening 23, and its width is adapted to the thickness of the movable blade disc 32, so that the movable blade disc 32 can rotate freely in this gap without interfering with the fixed blade discs 21 on both sides. When the movable blade disc 32 rotates, the blades on its outer periphery pass through the position of the shearing opening 23 in sequence, forming a shearing engagement with the cutting edges of the fixed blade discs 21 on both sides at the shearing opening 23, cutting off the material located in the shearing opening 23.

[0026] With the above structure, several fixed cutter discs 21 are connected in series through guide rods 22 to form an integral fixed cutter assembly, and the overall radial movement is achieved through the sliding cooperation between the guide rods 22 and the guide groove. When it is necessary to adjust the shearing gap, the synchronous drive mechanism 4 pushes the entire fixed cutter unit 2 to slide along the guide groove through the guide rods 22, and all fixed cutter discs 21 are displaced synchronously, thereby ensuring that the gap between each shearing port 23 and the corresponding moving cutter disc 32 is completely consistent throughout the entire length, and there will be no problem of uneven gap caused by asynchronous movement of the fixed cutter discs 21.

[0027] The sequential fitting structure between each fixed blade disc 21 eliminates the need for additional spacers or shims between adjacent fixed blade discs 21, resulting in a compact structure and high axial space utilization. This allows for the arrangement of the maximum number of fixed blade discs 21 within the limited internal space of the frame 1, thereby increasing the number of blades simultaneously engaged in shearing and improving crushing efficiency. When the cutting edge of a fixed blade disc 21 wears down after prolonged use, it can be easily removed from the guide rod 22 for re-grinding or replacement without replacing the entire fixed blade unit 2. This convenient and quick maintenance effectively reduces the operating and maintenance costs of the equipment.

[0028] Reference Figure 4Based on the above embodiments, an air passage 33 is formed inside the power shaft 31. Specifically, the power shaft 31 is a hollow shaft structure, and a through or semi-through central hole is opened inside it along the axial direction. This central hole constitutes the air passage 33. The air passage 33 extends along the entire length of the power shaft 31 for the circulation of compressed air. The preferred machining method for the air passage 33 is deep hole drilling to ensure that the inner wall is smooth and burr-free, so as to reduce airflow resistance. The outer side of the power shaft 31 is provided with a plurality of air blowing holes 34 that connect to the air passage 33. The air blowing holes 34 are located between two adjacent moving cutter discs 32, and the number of air blowing holes 34 corresponds to the number of gaps between the moving cutter discs 32. At least one air blowing hole 34 is provided at each gap position. Preferably, a plurality of air blowing holes 34 are evenly distributed along the circumference of the power shaft 31 to ensure that compressed air can be ejected from multiple directions simultaneously and evenly cover the entire annular gap area. One end of the power shaft 31 is also provided with a connector 35 that connects to the air passage 33. The connector 35 is preferably a rotary connector. Its fixed end is installed on the frame 1 or external bracket, and its rotating end is fixedly connected to the end of the power shaft 31 and rotates synchronously with the power shaft 31. The air inlet of the connector 35 is connected to an external compressed air source through a pipeline, and its air outlet is connected to the air passage 33 inlet at the end of the power shaft 31, thereby introducing external compressed air into the air passage 33. The rotary joint ensures that the power shaft 31 can still receive compressed air stably even when rotating continuously, and will not cause the air pipe to become tangled or break due to the rotation of the power shaft 31.

[0029] When the equipment is running, compressed air enters the air passage 33 through connector 35, flows axially along the power shaft 31, and is ejected through each air blowing hole 34 into the gap between two adjacent moving cutter discs 32. The high-speed airflow impacts and sweeps away the material debris accumulated in the shearing area, promptly blowing away small particles or dust trapped between the moving cutter discs 32 from the shearing area, preventing the material from accumulating, clumping, or melting and adhering in the narrow gap between the moving cutter discs 32, thereby ensuring the cleanliness and unobstructed flow of the shearing area.

[0030] Meanwhile, the airflow from the air holes 34 creates a local positive pressure environment in the shearing zone, effectively preventing external dust from entering the bearing area and extending the bearing's service life. Especially for highly plastic materials, which are prone to softening and adhering to the cutter head surface due to frictional heat during shearing, the cooling effect of compressed air can promptly remove the shearing heat, lower the cutter head temperature, effectively reduce material sticking to the cutter head, and ensure the stability and continuity of the crushing process. The air holes 34 are positioned between two adjacent moving cutter heads 32, allowing compressed air to directly act on the gap areas most prone to clogging, resulting in high purging efficiency and low air consumption. Furthermore, the uniform axial arrangement of the air holes 34 ensures that all shearing gaps receive sufficient airflow cleaning, eliminating local dead zones.

[0031] Reference Figure 6 , Figure 7 Based on the above embodiments, the synchronous drive mechanism 4 of the present invention includes: Support frames 41 are fixedly installed on both sides of frame 1; A slide block 42 is slidably connected to the inner side of the support frame 41. The slide block 42 is a rectangular block structure. It forms a sliding fit with the slide rail on the inner side wall of the support frame 41, so that the slide block 42 can only slide up and down in the radial direction of the support frame 41, while the movement in other directions is constrained. A connector 43 is fixedly connected between the slide block 42 and the guide rod 22 on the same side. A drive member 44 connecting the slide block 42 is also installed on the end face of the support frame 41.

[0032] The driving component 44 is preferably any one of a cylinder, hydraulic cylinder, or electric push rod. It is fixedly mounted on the upper or side end face of the support frame 41 via a mounting base, and its movable end is fixedly connected to the slide block 42. When the piston rod of the driving component 44 extends or retracts, it drives the slide block 42 to slide up and down along the slide rail of the support frame 41. Then, through the connecting component 43 and the guide rod 22, it drives the entire fixed blade unit 2 to reciprocate linearly in the radial direction, thereby realizing the precise adjustment of the shearing gap between the fixed blade disc 21 and the moving blade disc 32.

[0033] With the above structure, two support frames 41 are respectively set on both sides of the frame 1. Each support frame 41 is equipped with an independent slide 42 and a driving component 44. The driving components 44 on both sides move synchronously and jointly push the two ends of the fixed tool unit 2 to move radially at the same time, ensuring that the fixed tool unit 2 is always in a horizontal state during the adjustment process and will not be tilted due to unilateral driving.

[0034] The connector 43 has a simple and reliable structure. Its clearance groove passing through the side wall of the frame 1 is directly connected to the end of the guide rod 22. The power transmission path is short and the rigidity is high. There is no intermediate transmission link, and the response is fast and the adjustment accuracy is high.

[0035] The drive unit 44 is installed on the end face of the support frame 41 outside the frame 1. Compared with the method of setting the drive unit 44 inside the frame 1, the external installation is not only convenient for daily maintenance and repair, but also avoids the drive unit 44 from being contaminated by dust and material debris in the crushing chamber, thus improving the reliability and service life of the drive unit 44. The two slides 42 are respectively fixedly connected to the guide rods 22 on the corresponding sides through the connectors 43, so that the force points at both ends of the fixed blade unit 2 directly act on the ends of the guide rods 22 and the force is reasonable.

[0036] Reference Figure 7 In a preferred embodiment, the synchronous drive mechanism 4 of the present invention further includes: A rack 45 is fixedly installed on the side of the slide block 42. The rack 45 is a straight rack extending in a vertical direction. It is fixedly installed on the side of the slide block 42 facing the inner or outer side of the frame 1 by bolts or welding. The tooth surface of the rack 45 faces a direction parallel to the sliding direction of the slide block 42. The length of the rack 45 is not less than the sliding stroke of the slide block 42 to ensure that the rack 45 always maintains effective meshing with the gear 47 throughout the entire range of motion of the slide block 42. A synchronous shaft 46 is rotatably connected between the two support frames 41. Gears 47 are fixedly installed at both ends of the synchronous shaft 46, and the gears 47 mesh with the rack 45 for transmission.

[0037] When the driving members 44 on both sides simultaneously push the slide 42 up and down, the rack 45 fixedly installed on the side of the slide 42 moves synchronously with the slide 42, and the rack 45 drives the gear 47 meshing with it to rotate. Since the two gears 47 are rigidly connected through the same synchronous shaft 46, when one gear 47 is driven to rotate by the rack 45, this rotational motion is forcibly transmitted to the other gear 47 through the synchronous shaft 46, so that the other gear 47 rotates synchronously with the same speed and angle, and then drives the slide 42 on the other side to move synchronously through the rack 45 on the other side. Even if the output speed of the two driving members 44 is not completely consistent due to manufacturing errors, air pressure fluctuations or hydraulic flow differences, the rigid transmission connection of the synchronous shaft 46 and the gear 47 can force the two slides 42 to maintain strict synchronization, ensuring that the two ends of the fixed tool unit 2 always move forward and backward at the same time, and the displacement is completely equal.

[0038] The meshing transmission of rack 45 and gear 47 converts the linear motion of slide 42 into the rotational motion of gear 47. Then, the rotational motion is forcibly and synchronously transmitted to the other side through synchronous shaft 46. Finally, the rotational motion is converted back into linear motion through gear 47 and rack 45 on the other side, thus achieving mechanical rigid synchronization of slides 42 on both sides.

[0039] Compared to relying solely on electrical control to ensure synchronization of the two drive components 44, the mechanical rigidity synchronization of the synchronous shaft 46 and gear 47 is not affected by factors such as electrical signal delay, hydraulic system leakage, or cylinder compressibility, resulting in higher synchronization accuracy and stronger reliability; thus avoiding the skewed jamming failure of the fixed tool unit 2 due to unilateral drive.

[0040] Reference Figure 8 In some embodiments, two locking shafts 6 are inserted through the side of the frame 1. The locking shafts 6 are movably inserted into the filter screen 5. The two ends of the locking shafts 6 are respectively formed with a stop part 61 and a spring plug 62.

[0041] Specifically, the filter screen 5 has insertion holes or slots at both ends or sides that match the inner end of the locking shaft 6. The inner end of the locking shaft 6 passes through the side wall of the frame 1 and inserts into the corresponding insertion hole on the filter screen 5, thereby positioning and fixing the filter screen 5 in a predetermined position inside the frame 1. The connection between the locking shaft 6 and the filter screen 5 is a movable connection, that is, when the locking shaft 6 is pulled outward, the inner end of the locking shaft 6 exits from the insertion hole of the filter screen 5, and the filter screen 5 is released from its locked state, making it easy to remove from inside the frame 1 for cleaning or replacement.

[0042] When the filter screen 5 needs to be installed, place the filter screen 5 into the predetermined installation position inside the frame 1, and then push the locking shaft 6 inward so that the inner end of the locking shaft 6 passes through the side wall of the frame 1 and is inserted into the insertion hole of the filter screen 5 until the stop part 61 abuts against the outer wall of the frame 1, the spring plug 62 pops out and makes a "click" sound, indicating that the locking shaft 6 has been locked in place and the filter screen 5 is firmly fixed in the frame 1.

[0043] Based on the above embodiment, the locking shaft 6 is equipped with a sleeve 63 at the end of the spring plug 62. The end face of the sleeve 63 has a positioning hole adapted to the spring plug 62. Specifically, the sleeve 63 has a cylindrical structure, and its inner diameter matches the outer diameter of the locking shaft 6. The sleeve 63 is fitted around the outer circumference of the end of the locking shaft 6 near the outside of the frame 1, and the sleeve 63 and the locking shaft 6 can rotate relative to each other and slide relative to each other axially. The length of the sleeve 63 is less than the length of the locking shaft 6 exposed outside the frame 1. When the sleeve 63 slides axially along the locking shaft 6 to a predetermined position, the steel ball of the spring plug 62 springs into the positioning hole under the action of the spring force, locking the sleeve 63 and the locking shaft 6 relative to each other axially. The depth of the positioning hole is matched with the protrusion of the steel column, so that after the steel column is embedded in the positioning hole, it can provide sufficient locking force and can also be dislodged from the positioning hole when a certain external force is applied, allowing the sleeve 63 to slide axially relative to the locking shaft 6. The number of positioning holes can be set to one or more as needed, preferably multiple holes evenly distributed circumferentially along the end face of the sleeve 63 to achieve multi-angle positioning and locking. A swing structure 64 is provided between the sleeve 63 and the power shaft 31.

[0044] Reference Figure 8 Based on the above embodiments, the swing structure 64 includes: An eccentric bushing 641 is installed on the outside of the power shaft 31. A predetermined eccentricity e, preferably 2-5 mm, exists between the center of the outer ring of the eccentric bushing 641 and the center of the inner hole. This means the outer ring axis of the eccentric bushing 641 does not coincide with the rotation axis of the power shaft 31, and there is a certain offset between them. The axial installation position of the eccentric bushing 641 corresponds to the axial position of the sleeve 63 on the power shaft 31 to ensure accurate transmission alignment between the subsequent connecting arm 642 and the swing arm 643. Two connecting arms 642 are fixedly installed on the outer shell of the eccentric bushing 641. A swing arm 643 is fixedly installed on the side of the sleeve 63. A groove 644 is formed on the end face of the swing arm 643, and a guide shaft 645 that slides in the groove 644 is fixedly installed on the end face of the connecting arm 642.

[0045] When the power shaft 31 rotates, the eccentric bushing 641, which is fixedly mounted on the power shaft 31, rotates accordingly. Because there is an eccentricity between the outer center of the eccentric bushing 641 and the axis of rotation of the power shaft 31, the guide shaft 645 at the end of the connecting arm 642 on the outer shell of the eccentric bushing 641 moves in space in a circular trajectory with an eccentricity e as its radius. During its movement along this circular trajectory, the guide shaft 645 is constrained by the slide groove 644 and can only slide relative to the slide groove 644 along the length of the swing arm 643. Simultaneously, the sidewall of the slide groove 644 applies periodically varying thrust and pull forces to the swing arm 643, causing the swing arm 643 to reciprocate around the axis of the sleeve 63. The sleeve 63 swings synchronously with the swing arm 643, and through the cooperation of the spring plug 62 and the positioning hole, it drives the locking shaft 6 to reciprocate along its own axis. This vibration is ultimately transmitted to the filter screen 5.

[0046] Reference Figure 9 In addition, a plurality of striking rods 65 are threadedly connected to the end face of the locking shaft 6, and striking heads 66 are fixedly connected to the ends of the striking rods 65.

[0047] The striking head 66 is a block-shaped or spherical component fixedly mounted on the outer end of the striking rod 65. Its material is preferably a wear-resistant engineering plastic such as polyurethane, nylon, or copper alloy, to generate sufficient impact force when striking the filter screen 5 while avoiding damage to the filter screen 5. The shape of the striking head 66 is preferably hemispherical or round-headed to reduce contact stress between it and the filter screen 5 during striking, preventing pitting or deformation of the filter screen 5 surface. The striking heads 66 are evenly distributed circumferentially at the end of the locking shaft 6, and each striking head 66 faces the edge of the filter screen 5 or the side wall of the frame 1.

[0048] When the swing structure 64 drives the locking shaft 6 to reciprocate along its own axis, the striking rod 65 and striking head 66, fixedly mounted on the end face of the locking shaft 6, vibrate synchronously with the locking shaft 6. The vibration of the locking shaft 6 in the outward pulling direction causes the striking head 66 to strike the side wall of the frame 1 or the frame of the filter screen 5, generating an instantaneous impact force. This impact force is transmitted to the filter screen 5 through the frame 1 or the frame of the filter screen 5, causing the filter screen 5 to generate high-frequency impact vibration.

[0049] Compared to the weak vibration generated by friction transmission or intermittent contact of the locking shaft 6 alone, the hard impact of the striking rod 65 and the striking head 66 can generate a pulse-like impact with a larger amplitude and stronger impact force, which can effectively destroy the material bridging and blockage formed at the mesh of the filter screen 5, so that the particles stuck in the screen holes are shaken off or changed in posture under strong impact and pass through smoothly, further improving the anti-clogging ability and screening efficiency of the filter screen 5.

[0050] The striking rod 65 and the locking shaft 6 are connected by a threaded connection, which makes the disassembly and assembly of the striking rod 65 extremely convenient. When the striking head 66 is worn due to long-term striking, it can be replaced simply by unscrewing the striking rod 65 from the end face of the locking shaft 6. There is no need to disassemble the locking shaft 6 or other parts, resulting in low maintenance costs and short downtime.

[0051] The extension length of the striking rod 65 is infinitely adjustable via the threaded insertion depth, allowing the initial gap between the striking head 66 and the filter screen 5 or frame 1 to be freely set according to actual working conditions: a smaller gap results in more frequent striking and a greater impact force, suitable for materials prone to clogging; a larger gap reduces the striking frequency and force, suitable for materials that are not prone to clogging or for applications where noise can be reduced, greatly improving the equipment's adaptability to different material characteristics; multiple striking rods 65 are evenly distributed circumferentially along the end face of the locking shaft 6, so that multiple striking heads 66 strike different positions of the filter screen 5 sequentially or simultaneously during each vibration, achieving multi-point striking of the filter screen 5, avoiding deformation or localized wear that may be caused by uneven force on the filter screen 5 during single-point striking, and the vibration waves generated by multi-point striking superimposed on the filter screen 5, producing a stronger resonance effect and significantly improving the unclogging effect.

[0052] In the description of this invention, the terms "center," "longitudinal," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] The above description is only 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 low-speed plastic shredder cutter roller assembly, characterized in that, include: A frame (1) is provided, and a fixed blade unit (2) is fixedly installed inside the frame (1). The moving blade unit (3) is rotatably assembled inside the frame (1), and the moving blade unit (3) and the fixed blade unit (2) are arranged opposite each other in the circumferential direction to form a shearing fit; The fixed tool unit (2) and the frame (1) form a sliding guide fit along the straight direction. The frame (1) is provided with a synchronous drive mechanism (4) on the outside. The synchronous drive mechanism (4) is used to drive the fixed tool unit (2) to make a linear feed motion. A filter screen (5) is also provided on the inner side of the frame (1) and below the moving knife unit (3).

2. The low-speed plastic pulverizer cutter roller assembly according to claim 1, characterized in that: The moving blade unit (3) includes: A power shaft (31) passing through the frame (1); The power shaft (31) is connected to an external drive source, and several moving cutter heads (32) are fixedly installed on the outside of the power shaft (31).

3. The low-speed plastic pulverizer cutter roller assembly according to claim 2, characterized in that: The fixed-blade unit (2) includes: A number of fixed cutter discs (21) are attached in sequence, and a number of guide rods (22) are passed through the end faces of the fixed cutter discs (21). Guide grooves adapted to the sliding of the guide rods (22) are opened on both sides of the frame (1). A shearing opening (23) for accommodating a moving cutter disc (32) is constructed between two adjacent fixed cutter discs (21).

4. The low-speed plastic pulverizer cutter roller assembly according to claim 3, characterized in that: An air passage (33) is formed inside the power shaft (31), and several air holes (34) communicating with the air passage (33) are opened on the outside of the power shaft (31). The air holes (34) are located between two adjacent moving cutter discs (32), and a connector (35) communicating with the air passage (33) is also installed at one end of the power shaft (31).

5. The low-speed plastic pulverizer cutter roller assembly according to claim 3, characterized in that: The synchronous drive mechanism (4) includes: Support frames (41) are fixedly installed on both sides of the frame (1); A slide block (42) is slidably connected to the inner side of the support frame (41), and a connector (43) is fixedly connected between the slide block (42) and the guide rod (22) on the same side. A drive component (44) connecting the slide block (42) is also installed on the end face of the support frame (41).

6. The low-speed plastic pulverizer cutter roller assembly according to claim 5, characterized in that: The synchronous drive mechanism (4) further includes: A rack (45) is fixedly installed on the side of the slide (42); A synchronous shaft (46) is rotatably connected between the two support frames (41), and gears (47) are fixedly installed at both ends of the synchronous shaft (46). The gears (47) and the rack (45) mesh and drive each other.

7. The low-speed plastic pulverizer cutter roller assembly according to claim 2, characterized in that: Two locking shafts (6) are inserted through the side of the frame (1). The locking shafts (6) are movably inserted into the filter screen (5). The two ends of the locking shafts (6) are respectively formed with a stop part (61) and a spring plug (62).

8. The low-speed plastic pulverizer cutter roller assembly according to claim 7, characterized in that: The locking shaft (6) is equipped with a sleeve (63) at the end of the spring plug (62). The end face of the sleeve (63) is provided with a positioning hole adapted to the spring plug (62). A swing structure (64) is provided between the sleeve (63) and the power shaft (31).

9. The low-speed plastic pulverizer cutter roller assembly according to claim 8, characterized in that: The swing structure (64) includes: An eccentric bushing (641) is installed on the outside of the power shaft (31). Two connecting arms (642) are fixedly installed on the outer shell of the eccentric bushing (641). A swing arm (643) is fixedly installed on the side of the sleeve (63). A sliding groove (644) is opened on the end face of the swing arm (643). A guide shaft (645) that slides in the sliding groove (644) is fixedly installed on the end face of the connecting arm (642).

10. The low-speed plastic pulverizer cutter roller assembly according to claim 8, characterized in that: The locking shaft (6) has a plurality of striking rods (65) threadedly connected to its end face, and the end of each striking rod (65) is fixedly connected to a striking head (66).

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