PLA (polylactic acid) leftover material recycling, crushing, melting and re-granulating device

Abstract

The invention provides a PLA leftover material recycling, crushing, melting and re-granulating device, and belongs to the technical field of PLA processing, the PLA leftover material recycling, crushing, melting and re-granulating device comprises a melting cylinder and a feeding frame arranged on the melting cylinder, one end of the melting cylinder is provided with a discharging groove, one end of the discharging groove is provided with a discharging frame, the inner wall of one end of the discharging frame is provided with a granulating net, and the upper end of the discharging frame is provided with a fixing frame. According to the PLA leftover material recycling, crushing, melting and granulating device, PLA leftover materials can be rapidly recycled, so that secondary utilization of the leftover materials is achieved, cost expenditure is reduced, an arranged screen continuously shakes along with rotation of a crushing roller, materials adhering to the surface due to static electricity and viscosity of the screen can be effectively vibrated and cleaned away, and the working efficiency is improved. And meanwhile, the vibrating screen can spring materials clamped in the screen holes back to the crushing cavity through inertia force generated by vibration, and insufficient melting and local overheating caused by too large particle size difference of the materials are avoided, so that the quality stability and the production efficiency of regenerated particles are improved.

Description

Technical Field

[0001] This invention relates to the field of PLA processing technology, and more specifically, to a PLA scrap recycling, crushing, melting, and granulation device. Background Technology

[0002] PLA, a novel bio-based and renewable biodegradable material, is made from starch, a renewable plant resource. Due to its excellent biodegradability, it can be completely degraded into carbon dioxide and water by microorganisms in nature after use, causing no environmental pollution. It is widely used in packaging, agriculture, and medical fields. However, the production process of PLA materials and products generates a large amount of scrap material. If this scrap is not effectively recycled, it not only wastes resources but also increases production costs.

[0003] In existing technologies, the crushing and screening stage is a crucial initial phase in the field of PLA scrap recycling, as its processing efficiency directly affects the effectiveness of subsequent melting and granulation processes. However, most PLA scrap recycling crushing, melting, and granulation devices use screens that lack a shaking design. The inherent characteristics of PLA material make it prone to adhesion problems after crushing; the fine fragments easily stick together and adhere firmly to the screen surface. Without shaking assistance, the screen cannot effectively remove these adherents. Over time, the screen holes gradually become clogged, significantly reducing material throughput and lowering production efficiency. How to invent a PLA scrap recycling crushing, melting, and granulation device to solve these problems has become an urgent issue for those skilled in the art. Summary of the Invention

[0004] To overcome the above deficiencies, this invention provides a PLA scrap recycling, crushing, melting, and re-granulation device, which aims to solve the problem that the screen in the current crushing component cannot vibrate.

[0005] This invention is implemented as follows:

[0006] This invention provides a PLA scrap recycling, crushing, melting, and granulation device, comprising a melting cylinder and a feeding frame disposed on the melting cylinder. A feeding trough is provided at one end of the melting cylinder, and a feeding frame is installed at one end of the feeding trough. A granulation screen is installed on the inner wall of one end of the feeding frame. A fixing frame is installed at the upper end of the feeding frame, and a hydraulic rod is installed at the upper end of the fixing frame. A cutting blade is installed at the output end of the hydraulic rod. A conveying screw is installed on the inner wall of the melting cylinder, a first motor is installed at one end of the melting cylinder, and a heating jacket is installed on the outer wall of the melting cylinder.

[0007] The feeding frame is fixedly connected to the upper end of the melting cylinder. A second motor is installed on one outer wall of the feeding frame. A screen is installed inside the feeding frame. Two symmetrical fixing rods are provided on the lower side wall of the screen. Ear plates are installed on the outer wall of the fixing rods. Two symmetrical crushing rollers are installed on the inner wall of the feeding frame.

[0008] Preferably, one end of the feeding trough is fixedly connected to one end of the feeding frame, the outer wall of the granulation mesh is fixedly connected to the inner wall of the feeding frame, the lower end of the fixing frame is fixedly connected to the outer wall of the feeding frame, and the output end of the hydraulic rod is slidably connected to the inner wall of the fixing frame.

[0009] Preferably, the two end sidewalls of the conveying screw are rotatably connected to the inner wall of the melting cylinder, and the output end of the first motor is fixedly connected to one end of the conveying screw.

[0010] Preferably, the feeding frame and the melting cylinder are internally connected, the two end side walls of the crushing roller are rotatably connected to the inner wall of the feeding frame, a gear is fixedly connected to one end of the crushing roller, the two gears are meshed together, and the output end of the second motor is fixedly connected to one end of the crushing roller.

[0011] By adopting the above technical solution, when recycling PLA scrap, the scrap is first fed into the feeding frame, then the second motor is started to drive the crushing roller to rotate. Simultaneously, the two crushing rollers rotate against each other through gear meshing to crush the scrap. The crushed scrap falls through the screen into the melting cylinder below. Larger scrap particles fall through the inclined screen along the screening trough into the outer collection frame. The melting cylinder is heated by a heating jacket, melting the scrap inside. At the same time, the first motor is started to control the conveying screw to rotate. During rotation, the molten scrap is conveyed by the conveying blades on the outside of the screw. The molten scrap is then pushed out through the feeding chute on one side. As it passes through the granulation screen, the molten scrap is squeezed and cut into long strips. During this process, the hydraulic rod is activated to control the cutting blade to slide along the granulation screen and cut the long strips into several granules. The set recycling, crushing, melting and re-granulation device can quickly recycle PLA scrap, thereby realizing the secondary use of scrap and reducing costs.

[0012] Preferably, one end of the screen rests on the inner wall of the screening trough, a collection frame is fixedly connected to the outer wall of the feeding frame near the screening trough, the lower end of the screen is fixedly connected to the upper end of the fixing rod, and the outer wall of the fixing rod is slidably connected to the inner wall of the ear plate.

[0013] Preferably, the inner walls on both sides of the feeding frame are provided with symmetrical through grooves, the outer wall of the feeding frame near the through grooves is provided with a sliding groove, the outside of the fixing rod is fitted with a first spring, and the lower end of the fixing rod is fixedly connected to a fixing block.

[0014] Preferably, a slide rod is slidably connected to the inner wall of one end of the fixed block, a limit block is fixedly connected to one end of the slide rod, a second spring is sleeved on the outside of the slide rod, and the two side walls of the second spring are fixedly connected to the limit block and one end of the fixed block, respectively. An inclined groove is opened at the upper end of the limit block.

[0015] Preferably, an eccentric shaft is fixedly connected to the outer wall of one of the gears, a connecting rod is rotatably connected to the outer wall of the eccentric shaft, a fixed shaft is fixedly connected to one end of the connecting rod, a slider is rotatably connected to the outer wall of the fixed shaft, and a limiting rod that is slidably connected to the inner wall of the slide groove is fixedly connected to one side of the outer wall of the slider.

[0016] By adopting the above technical solution, the screen is continuously vibrated as the crushing roller rotates, which can effectively clean the material that is stuck to the surface due to static electricity and its own stickiness, avoid the screen holes being blocked, and ensure that the material that meets the particle size requirements can pass through the screen smoothly into the subsequent process. At the same time, the vibrating screen can use the inertial force generated by the vibration to bounce the material stuck in the screen holes back into the crushing chamber, avoiding insufficient melting and local overheating caused by excessive differences in material particle size, thereby improving the quality stability of the recycled particles.

[0017] The beneficial effects of this invention are:

[0018] The installed recycling, crushing, melting, and re-granulation device can quickly recycle PLA scraps, thereby achieving secondary utilization of scraps and reducing costs. The screen continuously vibrates with the rotation of the crushing roller, which can effectively vibrate and clean materials that adhere to the surface due to static electricity and their own stickiness, preventing the screen holes from being blocked and ensuring that materials that meet the particle size requirements can pass through the screen smoothly into subsequent processes. At the same time, the vibrating screen can use the inertial force generated by the vibration to bounce materials stuck in the screen holes back into the crushing chamber, avoiding insufficient melting and local overheating caused by excessive differences in material particle size, thereby improving the quality stability of recycled granules and production efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a PLA scrap recycling, crushing, melting, and re-granulation device provided by an embodiment of the present invention;

[0021] Figure 2This is a schematic diagram from another perspective of the structure of a PLA scrap recycling, crushing, melting and re-granulation device provided in an embodiment of the present invention;

[0022] Figure 3 This is a partial structural diagram of a PLA scrap recycling, crushing, melting, and re-granulation device provided in an embodiment of the present invention;

[0023] Figure 4 This is a partial structural cross-sectional view of a PLA scrap recycling, crushing, melting, and re-granulation device provided in an embodiment of the present invention;

[0024] Figure 5 This invention provides a PLA scrap recycling, crushing, melting, and regranulation device. Figure 4 Enlarged view of the structure of region A in the middle;

[0025] Figure 6 This is a partial half-sectional view of a PLA scrap recycling, crushing, melting and re-granulation device provided in an embodiment of the present invention;

[0026] Figure 7 This invention provides a PLA scrap recycling, crushing, melting, and regranulation device. Figure 6 Enlarged view of the structure of region B in the middle.

[0027] In the diagram: 1. Melting cylinder; 11. Feeding trough; 12. Feeding frame; 131. Granulation screen; 14. Fixing frame; 15. Hydraulic rod; 16. Cutting knife; 17. Heating jacket; 18. First motor; 19. Conveying screw; 2. Feeding frame; 21. Through groove; 22. Slide chute; 23. Ear plate; 24. Screening trough; 241. Collection frame; 25. Second motor; 3. Crushing roller; 31. Gear; 311. Eccentric shaft; 32. Connecting rod; 321. Fixing shaft; 33. Sliding block; 331. Limiting rod; 4. Screen; 41. Fixing rod; 42. First spring; 5. Fixing block; 51. Sliding rod; 52. Limiting block; 521. Inclined chute; 53. Second spring. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example, refer to Figures 1-7A PLA scrap recycling, crushing, melting, and granulation device includes a melting cylinder 1 and a feeding frame 2 disposed on the melting cylinder 1. A feeding trough 11 is opened at one end of the melting cylinder 1, and a feeding frame 12 is installed at one end of the feeding trough 11. A granulation screen 131 is installed on the inner wall of one end of the feeding frame 12. A fixing frame 14 is installed at the upper end of the feeding frame 12, and a hydraulic rod 15 is installed at the upper end of the fixing frame 14. A cutting blade 16 is installed at the output end of the hydraulic rod 15. A conveying screw 19 is installed on the inner wall of the melting cylinder 1. A first motor 18 is installed at one end of the melting cylinder 1, and a heating jacket 17 is installed on the outer wall of the melting cylinder 1.

[0030] The feeding frame 2 is fixedly connected to the upper end of the melting cylinder 1. A second motor 25 is installed on one outer wall of the feeding frame 2. A screen 4 is installed inside the feeding frame 2. Two symmetrical fixing rods 41 are provided on the lower side wall of the screen 4. Ear plates 23 are installed on the outer wall of the fixing rods 41. Two symmetrical crushing rollers 3 are installed on the inner wall of the feeding frame 2.

[0031] Further; one end of the feeding trough 11 is fixedly connected to one end of the feeding frame 12, the outer wall of the granulation screen 131 is fixedly connected to the inner wall of the feeding frame 12, the lower end of the fixing frame 14 is fixedly connected to the outer wall of the feeding frame 12, and the output end of the hydraulic rod 15 is slidably connected to the inner wall of the fixing frame 14. The characteristic feature is that the two end side walls of the conveying screw 19 are rotatably connected to the inner wall of the melting cylinder 1, and the output end of the first motor 18 is fixedly connected to one end of the conveying screw 19. The characteristic feature is that the inner walls of the feeding frame 2 and the melting cylinder 1 are connected... The crushing roller 3 has two side walls that are rotatably connected to the inner wall of the feeding frame 2. One end of the crushing roller 3 is fixedly connected to a gear 31, and the two gears 31 are meshed together. The output end of the second motor 25 is fixedly connected to one end of the crushing roller 3. The screen 4 is placed on the inner wall of the screening trough 24. The outer wall of the feeding frame 2 near the screening trough 24 is fixedly connected to a collection frame 241. The lower end of the screen 4 is fixedly connected to the upper end of the fixing rod 41. The outer wall of the fixing rod 41 is slidably connected to the inner wall of the ear plate 23.

[0032] It should be noted that when recycling PLA scrap, the scrap is first fed into the feeding frame 2, then the second motor 25 is started to drive the crushing roller 3 to rotate. At the same time, the two crushing rollers 3 rotate with each other through the meshing of gear 31 to crush the scrap. The crushed scrap falls through the screen 4 into the melting cylinder 1 below. Meanwhile, larger scrap particles fall through the inclined screen 4 along the screening trough 24 into the outer collection frame 241. The heating jacket 17 heats the melting cylinder 1, melting the scrap inside the cylinder. At the same time, the first motor 18 is started to control the conveying screw 19 to continue... During the rotation, the conveying blades on the outside of the conveying screw 19 transport the molten scrap material. Then, the molten scrap material is pushed out through the feed chute 11 on one side. When passing through the granulation screen 131, the molten scrap material is squeezed and cut into long strips. During this process, the hydraulic rod 15 is activated to control the cutting blade 16 to slide along the granulation screen 131 to cut the long strips into several granules to achieve granulation. The set recycling, crushing, melting and re-granulation device can quickly recycle PLA scrap material, thereby realizing the secondary use of scrap material and reducing cost expenditure.

[0033] Furthermore, symmetrical through grooves 21 are provided on the inner walls of both sides of the feeding frame 2, and a sliding groove is provided on the outer wall of the feeding frame 2 near the through grooves 21. A first spring 42 is sleeved on the outside of the fixing rod 41, and a fixing block 5 is fixedly connected to the lower end of the fixing rod 41. The feature is that a sliding rod 51 is slidably connected to the inner wall of one end of the fixing block 5, a limiting block 52 is fixedly connected to one end of the sliding rod 51, a second spring 53 is sleeved on the outside of the sliding rod 51, and the two side walls of the second spring 53 are fixedly connected to the limiting block 52 and one end of the fixing block 5, respectively. An inclined groove 521 is provided on the upper end of the limiting block 52. The feature is that an eccentric shaft 311 is fixedly connected to the outer wall of one of the gears 31, a connecting rod 32 is rotatably connected to the outer wall of the eccentric shaft 311, a fixing shaft 321 is fixedly connected to one side wall of the connecting rod 32, a slider 33 is rotatably connected to the outer wall of the fixing shaft 321, and a limiting rod 331 that is slidably connected to the inner wall of the sliding groove 22 is fixedly connected to one side of the outer wall of the slider 33.

[0034] It should be noted that during the process of the second motor 25 controlling the crushing roller 3 to rotate and crush the scrap, the eccentric shaft 311 on one side of the gear 31 rotates simultaneously. During this rotation, the connecting rod 32 on its outer side rotates, and at the same time, the slider 33 on the other side wall slides up and down under the action of the limiting rod 331 and the sliding groove 22. During the downward movement, the lower end of the slider 33 presses against the limiting block 52 and moves. During the movement of the limiting block 52, the sliding rod 51 at one end drives the fixed rod at the other end. The fixed block 5 moves downward in the through groove 21, compressing the first spring 42. When the fixed block 5 moves to the bottom of the through groove 21, one end of the sliding block 33, which continues to slide down, abuts against the inclined groove 521 on the limiting block 52. This causes the limiting block 52 to press the second spring 53 at one end against the fixed block 5, moving it closer to the fixed block 5 until the upper inclined groove 521 of the limiting block 52 disengages from the sliding block 33. At this point, the fixed block 5 and the limiting block 52 together rebound upward under the restoring force of the first spring 42, and then slide down the groove 33. When block 33 moves to its highest position, one end of limit block 52 disengages from the side wall of slider 33, and under the restoring force of the second spring 53, the upper inclined groove 521 of limit block 52 re-engages with the bottom end of slider 33. As crushing roller 3 continues to rotate, the movement of fixed block 5 is repeatedly controlled. During the downward movement of fixed block 5, the screen 4 is pulled downward by fixed rod 41 to squeeze the first spring 42 and slide down. When it slides to the lowest point, it slides upward quickly under the action of the second spring 53. During the up-and-down movement of screen 4, the screen 4 is shaken. When the screen 4 shakes, it can effectively clean the material that is stuck to the surface due to static electricity and its own stickiness, avoid the screen holes being blocked, and ensure that the material that meets the particle size requirements can pass through screen 4 smoothly into the subsequent process. At the same time, the shaking screen 4 can use the inertial force generated by the vibration to bounce the material stuck in the screen hole back into the crushing chamber, avoid insufficient melting and local overheating due to excessive material particle size difference, thereby improving the quality stability of recycled particles.

[0035] Working principle of a PLA scrap recycling, crushing, melting, and re-granulation device:

[0036] When recycling PLA scrap, the scrap is first fed into the feeding frame 2. Then, the second motor 25 is started to drive the crushing roller 3 to rotate. At the same time, the two crushing rollers 3 rotate with each other through the meshing of gears 31 to crush the scrap. The crushed scrap falls through the screen 4 into the melting cylinder 1 below. Meanwhile, larger scrap particles fall through the inclined screen 4 along the screening trough 24 into the outer collection frame 241. The heating jacket 17 heats the melting cylinder 1, melting the scrap inside the cylinder. At the same time, the first motor 18 is started to control the conveying screw 19 to rotate. During operation, the molten scrap is conveyed by the conveying blades on the outside of the conveying screw 19. Then, the molten scrap is pushed out through the feeding chute 11 on one side. When passing through the granulation screen 131, the molten scrap is squeezed and cut into long strips. During this process, the hydraulic rod 15 is activated to control the cutting blade 16 to slide along the granulation screen 131 to cut the long strips into several granules to achieve granulation. The set recycling, crushing, melting and re-granulation device can quickly recycle PLA scrap, thereby realizing the secondary use of scrap and reducing cost expenditure.

[0037] During the process of the second motor 25 controlling the crushing roller 3 to rotate and crush the scrap, the eccentric shaft 311 on one side of the gear 31 rotates simultaneously. During this rotation, the connecting rod 32 on its outer side rotates, and at the same time, the slider 33 on the other side wall slides up and down under the action of the limiting rod 331 and the sliding groove 22. During the downward movement, the lower end of the slider 33 presses against the limiting block 52 and moves. During the movement of the limiting block 52, the sliding rod 51 at one end drives the fixed block 5 at the other end downward into the through groove. The first spring 42 is compressed in section 21 to move the fixed block 5. When the fixed block 5 moves to the lowest end of the through groove 21, one end of the sliding block 33 continues to slide down and abuts against the inclined groove 521 on the limiting block 52. This causes the limiting block 52 to squeeze the second spring 53 at one end and move closer to the fixed block 5 until the upper inclined groove 521 of the limiting block 52 disengages from the sliding block 33. At this point, the fixed block 5 and the limiting block 52 together rebound upward under the restoring force of the first spring 42, and then the sliding block 33 moves to the lowest end of the through groove 21. At a high position, one end of the limiting block 52 disengages from the side wall of the slider 33, and under the restoring force of the second spring 53, the upper inclined groove 521 of the limiting block 52 re-engages with the bottom end of the slider 33. As the crushing roller 3 continues to rotate, the movement of the fixed block 5 is repeatedly controlled. During the downward movement of the fixed block 5, the screen 4 is pulled downward by the fixed rod 41 to squeeze the first spring 42 and slide down. When it slides to the lowest point, it slides upward quickly under the action of the second spring 53. During the up-and-down movement of the screen 4, the screen 4 is shaken. When the screen 4 shakes, it can effectively clean the material that is stuck to the surface due to static electricity and its own stickiness, avoid the screen holes being blocked, and ensure that the material that meets the particle size requirements can pass through the screen 4 smoothly into the subsequent process. At the same time, the shaking screen 4 can use the inertial force generated by the vibration to bounce the material stuck in the screen hole back into the crushing chamber, avoiding insufficient melting and local overheating due to excessive particle size difference, thereby improving the quality stability of the recycled particles and the production efficiency.

[0038] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail here.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A PLA scrap recycling, crushing, melting, and granulation device, comprising a melting cylinder (1) and a feeding frame (2) disposed on the melting cylinder (1), characterized in that, The melting cylinder (1) has a feeding trough (11) at one end, a feeding frame (12) is installed at one end of the feeding trough (11), a granulation screen (131) is installed on the inner wall of one end of the feeding frame (12), a fixing frame (14) is installed at the upper end of the feeding frame (12), a hydraulic rod (15) is installed at the upper end of the fixing frame (14), a cutting blade (16) is installed at the output end of the hydraulic rod (15), a conveying screw (19) is installed on the inner wall of the melting cylinder (1), a first motor (18) is installed at one end of the melting cylinder (1), and a heating jacket (17) is installed on the outer wall of the melting cylinder (1). The feeding frame (2) is fixedly connected to the upper end of the melting cylinder (1). A second motor (25) is installed on one side of the outer wall of the feeding frame (2). A screen (4) is installed inside the feeding frame (2). Two symmetrical fixing rods (41) are provided on the lower side wall of the screen (4). Ear plates (23) are installed on the outer wall of the fixing rods (41). Two symmetrical crushing rollers (3) are installed on the inner wall of the feeding frame (2).

2. The PLA scrap recycling, crushing, melting, and granulation device according to claim 1, characterized in that, One end of the feeding trough (11) is fixedly connected to one end of the feeding frame (12), the outer wall of the granulation mesh (131) is fixedly connected to the inner wall of the feeding frame (12), the lower end of the fixing frame (14) is fixedly connected to the outer wall of the feeding frame (12), and the output end of the hydraulic rod (15) is slidably connected to the inner wall of the fixing frame (14).

3. The PLA scrap recycling, crushing, melting, and granulation device according to claim 2, characterized in that, The two end sidewalls of the conveying screw (19) are rotatably connected to the inner wall of the melting cylinder (1), and the output end of the first motor (18) is fixedly connected to one end of the conveying screw (19).

4. The PLA scrap recycling, crushing, melting, and granulation device according to claim 3, characterized in that, The feeding frame (2) and the melting cylinder (1) are internally connected. The two side walls of the crushing roller (3) are rotatably connected to the inner wall of the feeding frame (2). A gear (31) is fixedly connected to one end of the crushing roller (3). The two gears (31) are meshed together. The output end of the second motor (25) is fixedly connected to one end of the crushing roller (3).

5. The PLA scrap recycling, crushing, melting, and granulation device according to claim 4, characterized in that, One end of the screen (4) rests on the inner wall of the screening trough (24). The outer wall of the feeding frame (2) near the screening trough (24) is fixedly connected to a collection frame (241). The lower end of the screen (4) is fixedly connected to the upper end of the fixing rod (41). The outer wall of the fixing rod (41) is slidably connected to the inner wall of the ear plate (23).

6. The PLA scrap recycling, crushing, melting, and granulation device according to claim 5, characterized in that, The inner walls of the feeding frame (2) are provided with symmetrical through grooves (21), and the outer wall of the feeding frame (2) above the through grooves (21) is provided with a sliding groove (22). The outer side of the fixing rod (41) is fitted with a first spring (42), and the lower end of the fixing rod (41) is fixedly connected to a fixing block (5).

7. The PLA scrap recycling, crushing, melting, and re-granulation device according to claim 6, characterized in that, A slide rod (51) is slidably connected to the inner wall of one end of the fixed block (5). A limit block (52) is fixedly connected to one end of the slide rod (51). A second spring (53) is sleeved on the outside of the slide rod (51). The two side walls of the second spring (53) are fixedly connected to the limit block (52) and one end of the fixed block (5), respectively. An inclined groove (521) is opened at the upper end of the limit block (52).

8. The PLA scrap recycling, crushing, melting, and granulation device according to claim 7, characterized in that, An eccentric shaft (311) is fixedly connected to the outer wall of one of the gears (31). A connecting rod (32) is rotatably connected to the outer wall of the eccentric shaft (311). A fixed shaft (321) is fixedly connected to one side wall of the connecting rod (32). A slider (33) is rotatably connected to the outer wall of the fixed shaft (321). A limiting rod (331) is fixedly connected to one side of the outer wall of the slider (33) and slidably connected to the inner wall of the slide groove (22).

Images