A shredder for plastic waste recycling

Abstract

The application relates to the field of plastic crushing, and discloses a crusher for plastic waste recycling, which comprises a crushing box, supporting legs and a feeding hopper, the bottom end of the crushing box is supported by the supporting legs, the top end of the crushing box is provided with the feeding hopper, and a lifting and pushing structure is arranged on the feeding hopper; a material rotating structure is arranged at the upper part in the crushing box, a second crushing structure is arranged in the middle of the crushing box, a screening structure is arranged at the lower part in the crushing box, and a material returning structure is arranged at the lower part of the left and right sides of the crushing box; the plastic put into the feeding hopper is sequentially received by the material rotating structure and then enters the extrusion structure, the plastic is extruded in the extrusion structure, and the first crushing structure is matched with the extrusion structure, so that the plastic can be preliminarily crushed while being extruded, the problem that the plastic is bounced in the crushing process due to the elasticity of the plastic can be better avoided, and the preliminarily crushed plastic is finely crushed by the second crushing structure, so that the crushing work efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of plastic crushing, and in particular to a crusher for recycling plastic waste. Background Technology

[0002] Plastic recycling and crushing is the process of breaking waste plastic products into particles or fragments using mechanical means. It is a pre-processing step for recycling. A crusher is used when crushing plastic.

[0003] In existing plastic crushers, plastic waste is fed from the feed hopper into the crushing chamber, where it is crushed by two sets of rotating crushing rollers and crushing blades.

[0004] However, in the actual crushing process, due to the elasticity of plastic, it is easy for the plastic to pop out when crushed between two sets of rotating crushing rollers, which makes it difficult for the crushing blades to crush the plastic effectively, thus reducing the crushing efficiency. Therefore, there is room for improvement. Summary of the Invention

[0005] To address the problems mentioned in the background section, the present invention provides a crusher for recycling plastic waste.

[0006] The present invention provides a crusher for recycling plastic waste, which adopts the following technical solution:

[0007] A crusher for recycling plastic waste includes a crushing box, supporting legs, and a feeding hopper. The bottom of the crushing box is supported by the supporting legs, and the top of the crushing box is equipped with a feeding hopper. A lifting and pushing structure is provided on the feeding hopper. A material transfer structure is provided at the top of the crushing box, a second crushing structure is provided in the middle of the crushing box, a screening structure is provided at the bottom of the crushing box, and a material return structure is provided on the lower left and right sides of the crushing box.

[0008] The material transfer structure includes a rotating shaft that rotates through the crushing box, a turntable fixedly sleeved on the rotating shaft, multiple extrusion crushing grooves opened on the side of the turntable, two baffles attached to the turntable on the inner wall of the crushing box, an extrusion structure in each extrusion crushing groove, a first motor installed on the front of the crushing box, and the output shaft of the first motor connected to one end of the rotating shaft.

[0009] The extrusion structure includes a first groove formed on both sides of the extrusion crushing groove, a hydraulic cylinder installed in the middle of the inner side wall of the first groove, an extrusion frame installed at one end of the output shaft of the hydraulic cylinder, a first crushing structure set inside the extrusion frame, and extrusion structures set on both the upper and lower sides of the extrusion frame.

[0010] The first crushing structure includes a first rotating rod that rotates through an extrusion frame, a first crushing roller fixedly sleeved on the middle of the first rotating rod, a plurality of first crushing blades arranged on the side of the first crushing roller, a first gear fixedly sleeved on the rear end of the first rotating rod, a mounting plate connected to one end face of the extrusion frame near the hydraulic cylinder, a second motor mounted on the mounting plate, a second gear sleeved on the output shaft of the second motor, and the second gear meshing with the first gear.

[0011] Preferably, the extrusion structure includes a second groove formed on the upper and lower side walls of the first groove, a second rotating rod rotatably connected to the rear side wall of the second groove, a rotating cylinder fixedly sleeved on the second rotating rod, an extrusion frame mounted on the rotating cylinder, the side of the extrusion frame being arc-shaped, the extrusion frame being hollow inside, a first fixing block mounted on the side wall of the second groove near one end of the second rotating rod, a first electric telescopic rod mounted on the first fixing block, one end of the output shaft of the first electric telescopic rod being connected to a first drive bar, a third gear fixedly sleeved on the front end of the second rotating rod, the third gear meshing with the teeth on the first drive bar.

[0012] Preferably, the second crushing structure includes two third rotating rods that rotate through the crushing box. Each of the third rotating rods is fixedly fitted with a second crushing roller. The second crushing roller is provided with a plurality of second crushing blades. A fourth gear is fixedly fitted on the front end of the third rotating rod. The two fourth gears are meshed and connected. A third motor is installed on the rear side of the crushing box. The output shaft of the third motor is connected to one of the third rotating rods.

[0013] Preferably, the screening structure includes two sets of fixing bars connected to the left and right sides of the crushing box, and a vertical rod is connected between each set of fixing bars. A screen plate is movably sleeved on the two sets of vertical rods. The screen plate is in the shape of an inverted "V". A first cylinder is installed on the left and right sides below the crushing box. A striking rod is connected to the top of the output shaft of the first cylinder. A ball-shaped striking block is provided at the top of the striking rod.

[0014] Preferably, the material return structure includes a discharge port located on the lower left and right sides of the crushing box, a feed port located near the middle on both left and right sides of the crushing box, a material return box installed on the lower left and right sides of the crushing box, a material lifting structure provided inside the material return box, a first connecting groove communicating with the discharge port located on the lower side of one side of the material return box, a second connecting groove communicating with the feed port located on the upper side of one side of the material return box, and a guide plate connected to the inner walls of both sides of the material return box located below the feed port.

[0015] Preferably, the material lifting structure includes a first lifting frame that can be movably inserted into the return material box, a second cylinder installed at the bottom center of the return material box, the bottom end of the output shaft of the second cylinder being connected to the first lifting frame, and a return material frame being provided above the first lifting frame via a flipping structure.

[0016] Preferably, the flipping structure includes a fourth rotating rod that rotates through the top of the first lifting frame. A sleeve plate is connected to both ends of the return frame. The sleeve plate is fixedly fitted onto the fourth rotating rod. A fifth gear is fixedly fitted onto both ends of the fourth rotating rod. Two sets of second fixing blocks are provided on the end faces of the first lifting frame. A through strip movably passes through each of the two second fixing blocks in each set. A second driving strip is provided on the through strip. The fifth gear meshes with the teeth on the second driving strip. One end of the through strip is connected to an insert rod. A driving groove is opened on the inner wall of one side of the return box. The upper section of the driving groove is "Z" shaped. One end of the insert rod is movably inserted into the driving groove.

[0017] Preferably, the lifting and pushing structure includes a U-shaped plate fastened to the feed hopper by bolts. Vertical grooves are provided on both the front and rear sides of the U-shaped plate. A lifting plate is slidably disposed in the vertical grooves. Second electric telescopic rods are installed at both ends of the upper part of the U-shaped plate. The bottom end of the output shaft of the second electric telescopic rod is connected to the lifting plate. L-shaped plates are connected to both ends of the side of the lifting plate. A second lifting frame is connected to the bottom end of the L-shaped plate. Side plates are connected to both sides of the second lifting frame. Multiple extrusion rods move through each side plate. An extrusion block is installed at the bottom end of each extrusion rod. The extrusion block is truncated cone-shaped. A driving plate is connected to the top of each group of multiple extrusion rods. A U-shaped rod is connected to the top of the driving plate. A third electric telescopic rod is installed in the middle of the lower part of the second lifting frame. The top end of the output shaft of the third electric telescopic rod is connected to a middle plate. Insert plates are movably inserted into slots on both ends of the middle plate. One end of each insert plate is connected to the driving frame, and the driving frame is movably sleeved on the U-shaped rod.

[0018] In summary, the present invention has the following beneficial technical effects:

[0019] 1. This invention, by setting up a material transfer structure, an extrusion structure, a first crushing structure, a material squeezing structure, and a second crushing structure, allows the plastic fed into the hopper to be sequentially received into the extrusion structure via the material transfer structure. The plastic is then extruded in the extrusion structure, and in conjunction with the first crushing structure, the plastic is initially crushed during the extrusion process. This better avoids the problem of the plastic popping out during the crushing process due to its own elasticity. The plastic after initial crushing is then finely crushed by the second crushing structure, thereby improving the crushing efficiency.

[0020] 2. This invention, by setting up a screening structure, a return structure, a lifting structure, and a turning structure, allows the screening structure to separate larger volumes of plastic after secondary crushing and collect them into the return structure. Under the action of the lifting structure, the collected plastic is lifted, and with the help of the turning structure, the plastic can be automatically poured back into the second crushing structure for further crushing, making the crushing of plastic more thorough and improving the quality of crushing work.

[0021] 3. By setting up a lifting and pushing structure, the present invention can push the plastic material from the feeding hopper to the transfer structure, making the feeding smoother and avoiding the problem of feeding blockage in the feeding hopper. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a crusher for recycling plastic waste according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the lifting and pushing structure in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the material transfer structure inside the crushing box in an embodiment of the present invention;

[0025] Figure 4 This is an embodiment of the present invention. Figure 3 Enlarged view of the structure at point A;

[0026] Figure 5 This is a schematic diagram of the structure of the second crushing structure inside the crushing box in an embodiment of the present invention;

[0027] Figure 6 This is an embodiment of the present invention. Figure 5 Enlarged view of the structure at point B;

[0028] Figure 7 This is an embodiment of the present invention. Figure 5 Enlarged view of the structure at point C;

[0029] Figure 8 This is a schematic diagram of the material return structure in an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the internal structure of the return material box in an embodiment of the present invention;

[0031] Figure 10 This is an embodiment of the present invention. Figure 9 Enlarged view of the structure at point D;

[0032] Figure 11 This is a schematic diagram of the structure at the end face of the first lifting frame in an embodiment of the present invention;

[0033] Figure 12 This is an embodiment of the present invention. Figure 11 Enlarged view of the structure at point E.

[0034] Explanation of reference numerals in the attached drawings: 1. Crushing box; 2. Support leg; 3. Feed hopper; 4. First motor; 5. Turntable; 6. Stop; 7. Extrusion crushing trough; 8. First groove; 9. Hydraulic cylinder; 10. Extrusion frame; 11. First rotating rod; 12. First crushing roller; 13. First crushing blade; 14. First gear; 15. Mounting plate; 16. Second motor; 17. Second gear; 18. Second groove; 19. Second rotating rod; 20. Third gear; 21. Rotary drum; 22. Extrusion frame; 23. First fixing block; 24. First electric telescopic rod; 25. First drive bar; 26. Third motor; 27. Third rotating rod; 28. Fourth gear; 29. ​​Second crushing roller; 30. Second crushing blade; 31. Fixing bar; 32. Vertical rod; 33. Lower... 34. Feed inlet; 35. Screen plate; 36. First cylinder; 37. Striking rod; 38. Striking block; 39. Feed inlet; 40. Return box; 41. First lifting frame; 42. Second cylinder; 43. Return box; 44. First connecting groove; 45. Second connecting groove; 46. Fourth rotating rod; 47. Fifth gear; 48. Sleeve plate; 49. Second fixing block; 50. Through strip; 51. Insert rod; 52. Second driving strip; 53. Driving groove; 54. Feeding plate; 55. U-shaped plate; 56. Vertical groove; 57. Lifting plate; 58. L-shaped plate; 59. Second lifting frame; 60. Middle plate; 61. Insert plate; 62. Driving frame; 63. U-shaped rod; 64. Driving plate; 65. Side plate; 66. Extrusion rod; 67. Extrusion block; 68. Second electric telescopic rod. Detailed Implementation

[0035] The following is in conjunction with the appendix Figures 1-12 The present invention will be described in further detail below.

[0036] Reference Figures 1-12 This invention discloses a crusher for recycling plastic waste, including a crushing box 1, supporting legs 2, and a feeding hopper 3. The bottom of the crushing box 1 is supported by the supporting legs 2, and the top of the crushing box 1 is provided with the feeding hopper 3. A lifting and pushing structure is provided on the feeding hopper 3. A material transfer structure is provided at the top of the crushing box 1, a second crushing structure is provided in the middle of the crushing box 1, a screening structure is provided at the bottom of the crushing box 1, and a material return structure is provided on the lower left and right sides of the crushing box 1. A material discharge chute is opened in the middle of the bottom of the crushing box 1.

[0037] The material transfer structure includes a rotating shaft that rotates through the crushing box 1, a turntable 5 fixedly sleeved in the middle of the rotating shaft, multiple extrusion crushing grooves 7 opened on the side of the turntable 5, two baffles 6 attached to the turntable 5 on the inner wall of the crushing box 1, an extrusion structure in each extrusion crushing groove 7, a first motor 4 installed on the front of the crushing box 1, and the output shaft of the first motor 4 connected to one end of the rotating shaft.

[0038] The extrusion structure includes a first groove 8 opened on both sides of the extrusion crushing trough 7, a hydraulic cylinder 9 installed in the middle of the inner side wall of the first groove 8, an extrusion frame 10 installed at one end of the output shaft of the hydraulic cylinder 9, a first crushing structure set inside the extrusion frame 10, and extrusion structures set on both the upper and lower sides of the extrusion frame 10.

[0039] The first crushing structure includes a first rotating rod 11 that rotates through the extrusion frame 10, a first crushing roller 12 fixedly sleeved on the middle of the first rotating rod 11, a plurality of first crushing blades 13 arranged on the side of the first crushing roller 12, a first gear 14 fixedly sleeved at the rear end of the first rotating rod 11, a mounting plate 15 connected to one end face of the extrusion frame 10 near the hydraulic cylinder 9, a second motor 16 mounted on the mounting plate 15, a second gear 17 sleeved on the output shaft of the second motor 16, and the second gear 17 meshing with the first gear 14;

[0040] The extrusion structure includes a second groove 18 formed on the upper and lower sides of the first groove 8. A second rotating rod 19 is rotatably connected to the rear side wall of the second groove 18. A rotating cylinder 21 is fixedly sleeved on the second rotating rod 19. An extrusion frame 22 is installed on the rotating cylinder 21. The side of the extrusion frame 22 is arc-shaped and the inside of the extrusion frame 22 is hollow. A first fixing block 23 is installed on the groove wall of the second groove 18 near one end of the second rotating rod 19. A first electric telescopic rod 24 is installed on the first fixing block 23. One end of the output shaft of the first electric telescopic rod 24 is connected to a first drive bar 25. A third gear 20 is fixedly sleeved on the front end of the second rotating rod 19. The third gear 20 is meshed with the teeth of the first drive bar 25.

[0041] The second crushing structure includes two third rotating rods 27 that rotate through the crushing chamber 1. Each third rotating rod 27 is fixedly fitted with a second crushing roller 29, and several second crushing blades 30 are set on the second crushing roller 29. A fourth gear 28 is fixedly fitted on the front end of the third rotating rod 27, and the two fourth gears 28 are meshed together. A third motor 26 is installed on the rear side of the crushing chamber 1. The output shaft of the third motor 26 is connected to one of the third rotating rods 27. During crushing, the first motor 4 is started to drive the rotating shaft and the turntable 5 to rotate inside the crushing chamber 1. When the extrusion crushing trough 7 on the turntable 5 rotates to below the feed hopper 3, the plastic added in the feed hopper 3 is discharged into the extrusion crushing trough 7. Then the turntable 5 continues to rotate. During the rotation of the turntable 5, the hydraulic cylinder 9 in the extrusion crushing trough 7 is started to drive the two extrusion frames 10 to move towards the middle and extrude the plastic. At the same time, the second motor 16 on the mounting plate 15 is started. It drives the first crushing roller 12 and the first crushing blade 13 to rotate as a whole through the first gear 14 and the second gear 17, and crushes the plastic in the extrusion crushing trough 7. The initial crushing process begins, and the first electric telescopic rod 24 on the first fixed block 23 moves the first drive bar 25. Through the third gear 20, the rotating drum 21 and the extrusion frame 22 rotate as a whole, thereby squeezing the plastic in the extrusion crushing trough 7 between the two sets of first crushing rollers 12. At the same time, with the blocking of the baffle 6, the initial crushing of the plastic between the two sets of first crushing rollers 12 is better, avoiding the problem of plastic popping out during the crushing process and reducing the crushing efficiency. Then, when the extrusion crushing trough 7 on the turntable 5 rotates to the vertical downward position, the plastic that has been initially crushed in the extrusion crushing trough 7 falls between the two second crushing rollers 29. At this time, the third motor 26 is started, and under the action of the two fourth gears 28, the two sets of second crushing rollers 29 and the second crushing blade 30 are driven to rotate, which better performs fine crushing of the plastic after the initial crushing. Furthermore, when the small volume of plastic after the initial crushing is crushed in the two sets of second crushing rollers 29, the problem of plastic popping out is better avoided, making the crushing of plastic smoother.

[0042] See Figures 1-7 The screening structure includes two sets of fixing bars 31 connected to the left and right sides of the crushing box 1. Each set of fixing bars 31 is connected to a vertical rod 32. A screen plate 34 is movably sleeved on the two sets of vertical rods 32. The screen plate 34 is in the shape of an inverted "V". A first cylinder 35 is installed on the left and right sides below the crushing box 1. The top of the output shaft of the first cylinder 35 is connected to a striking rod 36. A ball-shaped striking block 37 is set at the top of the striking rod 36.

[0043] The material return structure includes a discharge port 33 located on the lower left and right sides of the crushing box 1, a feed port 38 located near the middle on both left and right sides of the crushing box 1, and a material return box 39 installed on the lower left and right sides of the crushing box 1. The material return box 39 contains a lifting structure. A first connecting groove 43 communicating with the discharge port 33 is located on the lower side of one side of the material return box 39, and a second connecting groove 44 communicating with the feed port 38 is located on the upper side of one side of the material return box 39. Feed guide plates 53 are connected to the inner walls of both sides of the material return box 39 below the feed port 38.

[0044] The material lifting structure includes a first lifting frame 40 that is movably inserted into the return box 39, a second cylinder 41 installed at the middle of the bottom of the return box 39, the bottom end of the output shaft of the second cylinder 41 connected to the first lifting frame 40, and a return frame 42 set above the first lifting frame 40 by a flipping structure.

[0045] The flipping structure includes a fourth rotating rod 45 that rotates through the top of the first lifting frame 40. Sleeves 47 are connected to both ends of the return frame 42, and the sleeves 47 are fixedly fitted onto the fourth rotating rod 45. Fifth gears 46 are fixedly fitted onto both ends of the fourth rotating rod 45. Two sets of second fixing blocks 48 are provided on the end faces of the first lifting frame 40. A through-bar 49 moves through each set of two second fixing blocks 48. A second driving bar 51 is provided on the through-bar 49. The fifth gear 46 meshes with the teeth of the second driving bar 51. One end of the through-bar 49 is connected to an insert rod 50. A driving groove 52 is opened on the inner wall of one side of the return box 39. The upper section of the driving groove 52 is "Z" shaped. One end of the insert rod 50 is movably inserted into the driving groove 52. The finely crushed plastic from between the two sets of second crushing rollers 29 and the second crushing blades 30 falls onto the screen plate 34. At this time, the first cylinder 35 is activated, driving the striking rod 36 and the striking block 37 to move up and down as a whole. The plastic is tilted onto the screen plate 34, allowing the qualified plastic to fall smoothly into the feeding chute. Since the screen plate 34 is inverted "V" shape, the unqualified plastic separated by the screen plate 34 is fed into the return frame 42 in the return box 39 through the feeding port 33. When the second cylinder 41 is started, the first lifting frame 40 and the return frame 42 move upward in the return box 39. When the return frame 42 moves to the second connecting groove 44, the insert rod 50 slides in the driving groove 52, driving the through bar 49 to move on the second fixed block 48. Through the second driving bar 51 and the fifth gear 46, the return frame 42 is rotated in the return box 39. Thus, at the second connecting groove 44 and the feeding port 38, and with the help of the guide plate 53, the unqualified plastic is fed back into the two sets of rotating second crushing rollers 29 and second crushing blades 30 for a third crushing operation. This makes the crushing of plastic more thorough and improves the quality of the crushing operation.

[0046] See Figure 1 , Figure 6 and Figure 8 The lifting and pushing structure includes a U-shaped plate 54 bolted to the feed hopper 3. Vertical grooves 55 are provided on both the front and rear sides of the U-shaped plate 54, and a lifting plate 56 is slidably disposed within the grooves 55. Second electric telescopic rods 67 are installed at both ends of the U-shaped plate 54, with the bottom end of the output shaft of the second electric telescopic rods 67 connected to the lifting plate 56. L-shaped plates 57 are connected to both ends of the sides of the lifting plate 56, and a second lifting frame 58 is connected to the bottom end of the L-shaped plates 57. Side plates 64 are connected to both sides of the second lifting frame 58, and multiple extrusion rods 65 move through each side plate 64. An extrusion block 66, shaped like a frustum, is installed at the bottom end of each extrusion rod 65. A driving plate 63 is connected to the top of each group of multiple extrusion rods 65, and a U-shaped rod 62 is connected to the top of the driving plate 63. A third electric... The third electric telescopic rod has its output shaft connected to the middle plate 59. Insert plates 60 are movably inserted into slots on both ends of the middle plate 59. One end of each insert plate 60 is connected to a drive frame 61, which is movably mounted on a U-shaped rod 62. After the crushed plastic is fed into the feed hopper 3, the second electric telescopic rod 67 on the U-shaped plate 54 is activated to move the lifting plate 56 downwards, thereby moving the extrusion block 66 downwards into the feed hopper 3. Thus, when feeding material into the extrusion and crushing trough 7, the third electric telescopic rod on the second lifting frame 58 is activated, causing the middle plate 59 and insert plates 60 to move up and down as a whole. Through the drive frame 61 and the U-shaped rod 62, the two sets of extrusion rods 65 and extrusion blocks 66 move up and down in the feed hopper 3, smoothly feeding the plastic from the feed hopper 3 into the extrusion and crushing trough 7, avoiding feeding blockage.

[0047] The implementation principle of a crusher for recycling plastic waste according to an embodiment of the present invention is as follows: First, the first motor 4 is started to drive the rotating shaft and the turntable 5 to rotate in the crushing box 1. When the extrusion crushing trough 7 on the turntable 5 rotates to below the feed hopper 3, the plastic material added in the feed hopper 3 is discharged into the extrusion crushing trough 7. During this process, the second electric telescopic rod 67 on the U-shaped plate 54 is started to drive the lifting plate 56 to move down, thereby driving the extrusion block 66 to move down into the feed hopper 3. Thus, when the material is discharged into the extrusion crushing trough 7, the third electric telescopic rod on the second lifting frame 58 is started to drive the middle plate 59 and the insert plate 60 to move up and down as a whole. And through the drive frame 61 and the U-shaped rod 62, the two sets of extrusion rods 65 and the extrusion block 66 are driven to move up and down in the feed hopper 3, pushing the plastic material into the feed hopper 3. The plastic material in the feed hopper 3 is smoothly fed into the extrusion and crushing trough 7, avoiding the problem of material blockage. Then, the turntable 5 continues to rotate. During the rotation of the turntable 5, the hydraulic cylinder 9 in the extrusion and crushing trough 7 is activated, which drives the two extrusion frames 10 to move towards the center, extruding the plastic. At the same time, the second motor 16 on the mounting plate 15 is activated. It drives the first crushing roller 12 and the first crushing blade 13 to rotate as a whole through the first gear 14 and the second gear 17, performing preliminary crushing work on the plastic in the extrusion and crushing trough 7. At the same time, the first electric telescopic rod 24 on the first fixed block 23 is activated, which drives the first drive bar 25 to move. Through the third gear 20, it drives the rotating drum 21 and the extrusion frame 22 to rotate as a whole, thereby pushing the plastic in the extrusion and crushing trough 7 towards the two sets of first crushing rollers 12 and 23. The material is squeezed between the two sets of first crushing rollers 12, and with the blocking of the baffle 6, the plastic is better crushed between the two sets of first crushing rollers 12, avoiding the problem of plastic popping out during the crushing process and reducing the crushing efficiency. Then, when the extrusion crushing groove 7 on the turntable 5 rotates to the vertical downward position, the plastic that has been initially crushed in the extrusion crushing groove 7 falls between the two sets of second crushing rollers 29. At this time, the third motor 26 is started, and under the action of the two fourth gears 28, it drives the two sets of second crushing rollers 29 and the second crushing blade 30 to rotate, so as to better perform fine crushing on the plastic after the initial crushing. Furthermore, when the small volume of plastic after the initial crushing is crushed in the two sets of second crushing rollers 29, the problem of plastic popping out is better avoided, thus improving the plastic's performance. The crushing process becomes smoother. Then, the finely crushed plastic between the two sets of second crushing rollers 29 and second crushing blades 30 falls onto the screen plate 34. At this time, the first cylinder 35 is activated, driving the striking rod 36 and striking block 37 to move up and down as a whole. The striking block 37 is tilted onto the screen plate 34, allowing the qualified crushed plastic on the screen plate 34 to fall smoothly into the feeding chute. Since the screen plate 34 is inverted "V" shape, the unqualified plastic screened by the screen plate 34 is fed into the return frame 42 in the return box 39 through the feeding port 33. Thus, when the second cylinder 41 is activated, it drives the first lifting frame 40 and the return frame 42 to move upward in the return box 39. When the return frame 42 moves upward to the second connecting groove 44, it slides in the driving groove 52 using the insert rod 50.The through-bar 49 moves on the second fixed block 48, and through the second driving bar 51 and the fifth gear 46, the return frame 42 is rotated in the return box 39. This, in conjunction with the feed plate 53, allows the substandard plastic to be re-feed between the two sets of rotating second crushing rollers 29 and second crushing blades 30 for a third crushing operation. This results in more thorough crushing of the plastic, improving the quality of the crushing process and increasing efficiency.

[0048] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A crusher for recycling plastic waste, comprising a crushing box (1), support legs (2), and a feed hopper (3), characterized in that: The bottom of the crushing box (1) is supported by a support leg (2), the top of the crushing box (1) is provided with a feed hopper (3), and the feed hopper (3) is provided with a lifting and pushing structure; a material transfer structure is provided at the top of the crushing box (1), a second crushing structure is provided in the middle of the crushing box (1), a screening structure is provided at the bottom of the crushing box (1), and a material return structure is provided at the bottom of both the left and right sides of the crushing box (1); The material transfer structure includes a rotating shaft that rotates through the crushing box (1), a turntable (5) is fixedly sleeved on the middle of the rotating shaft, and multiple extrusion crushing grooves (7) are opened on the side of the turntable (5). Two baffles (6) are provided on the inner wall of the crushing box (1) and attached to the turntable (5). Each extrusion crushing groove (7) is provided with an extrusion structure. A first motor (4) is installed on the front of the crushing box (1), and the output shaft of the first motor (4) is connected to one end of the rotating shaft. The extrusion structure includes a first groove (8) opened on both sides of the extrusion crushing groove (7), a hydraulic cylinder (9) is installed in the middle of the inner side of the first groove (8), an extrusion frame (10) is installed at one end of the output shaft of the hydraulic cylinder (9), a first crushing structure is provided in the extrusion frame (10), and extrusion structures are provided on both the upper and lower sides of the extrusion frame (10). The first crushing structure includes a first rotating rod (11) that rotates through the extrusion frame (10), a first crushing roller (12) is fixedly sleeved on the middle of the first rotating rod (11), a plurality of first crushing blades (13) are arranged on the side of the first crushing roller (12), a first gear (14) is fixedly sleeved on the rear end of the first rotating rod (11), an installation plate (15) is connected to one end face of the extrusion frame (10) near the hydraulic cylinder (9), a second motor (16) is installed on the installation plate (15), a second gear (17) is sleeved on the output shaft of the second motor (16), and the second gear (17) is meshed with the first gear (14).

2. The crusher for recycling plastic waste according to claim 1, characterized in that: The extrusion structure includes a second groove (18) on the upper and lower sides of the first groove (8). A second rotating rod (19) is rotatably connected to the rear side wall of the second groove (18). A rotating cylinder (21) is fixedly sleeved on the second rotating rod (19). An extrusion frame (22) is installed on the rotating cylinder (21). The side of the extrusion frame (22) is arc-shaped. The extrusion frame (22) is hollow inside. A first fixing block (23) is installed on the side wall of the second groove (18) near one end of the second rotating rod (19). A first electric telescopic rod (24) is installed on the first fixing block (23). One end of the output shaft of the first electric telescopic rod (24) is connected to a first drive bar (25). A third gear (20) is fixedly sleeved on the front end of the second rotating rod (19). The third gear (20) meshes with the teeth on the first drive bar (25).

3. A crusher for recycling plastic waste according to claim 1, characterized in that: The second crushing structure includes two third rotating rods (27) that rotate through the crushing box (1). Each of the third rotating rods (27) is fixedly fitted with a second crushing roller (29). The second crushing roller (29) is provided with several second crushing blades (30). A fourth gear (28) is fixedly fitted on the front end of the third rotating rod (27). The two fourth gears (28) are meshed and connected. A third motor (26) is installed on the rear side of the crushing box (1). The output shaft of the third motor (26) is connected to one of the third rotating rods (27).

4. A crusher for recycling plastic waste according to claim 1, characterized in that: The screening structure includes two sets of fixing bars (31) connected to the left and right sides of the crushing box (1). Each set of fixing bars (31) is connected to a vertical rod (32). A screen plate (34) is movably sleeved on the two sets of vertical rods (32). The screen plate (34) is in the shape of an inverted "V". A first cylinder (35) is installed on the left and right sides below the crushing box (1). The top of the output shaft of the first cylinder (35) is connected to a striking rod (36). A ball-shaped striking block (37) is set at the top of the striking rod (36).

5. A crusher for recycling plastic waste according to claim 1, characterized in that: The material return structure includes a discharge port (33) located on the lower left and right sides of the crushing box (1). A feed port (38) is provided on both the left and right sides of the crushing box (1) near the middle position. A material return box (39) is installed on the lower left and right sides of the crushing box (1). A material lifting structure is provided inside the material return box (39). A first connecting groove (43) communicating with the discharge port (33) is provided on the lower side of one side of the material return box (39). A second connecting groove (44) communicating with the feed port (38) is provided on the upper side of one side of the material return box (39). A feed plate (53) is connected to the inner walls of both sides of the material return box (39) below the feed port (38).

6. A crusher for recycling plastic waste according to claim 5, characterized in that: The material lifting structure includes a first lifting frame (40) that is movably inserted into the return box (39). A second cylinder (41) is installed in the middle of the bottom of the return box (39). The bottom end of the output shaft of the second cylinder (41) is connected to the first lifting frame (40). A return frame (42) is provided above the first lifting frame (40) through a flipping structure.

7. A crusher for recycling plastic waste according to claim 6, characterized in that: The flipping structure includes a fourth rotating rod (45) that rotates through the top of the first lifting frame (40). The return frame (42) is connected to a sleeve plate (47) near both ends. The sleeve plate (47) is fixedly sleeved on the fourth rotating rod (45). The fourth rotating rod (45) is fixedly sleeved on both ends. Two sets of second fixing blocks (48) are provided on both ends of the first lifting frame (40). A through strip (49) moves through each of the two second fixing blocks (48). A second driving strip (51) is provided on the through strip (49). The teeth of the fifth gear (46) and the second driving strip (51) mesh with each other. One end of the through strip (49) is connected to an insert rod (50). A driving groove (52) is opened on one side of the inner wall of the return box (39). The upper part of the driving groove (52) is "Z" shaped. One end of the insert rod (50) is movably inserted into the driving groove (52).

8. A crusher for recycling plastic waste according to claim 1, characterized in that: The lifting and pushing structure includes a U-shaped plate (54) fastened to the feed hopper (3) by bolts. Vertical grooves (55) are provided on both the front and rear sides of the U-shaped plate (54). A lifting plate (56) is slidably disposed in the vertical grooves (55). A second electric telescopic rod (67) is installed at both ends of the upper part of the U-shaped plate (54). The bottom end of the output shaft of the second electric telescopic rod (67) is connected to the lifting plate (56). L-shaped plates (57) are connected to both ends of the sides of the lifting plate (56). A second lifting frame (58) is connected to the bottom end of the L-shaped plate (57). Side plates (64) are connected to both sides of the second lifting frame (58). Each side plate (64) has... All of them move through multiple extrusion rods (65), and each extrusion rod (65) has an extrusion block (66) installed at the bottom end. The extrusion block (66) is shaped like a frustum. Each set of multiple extrusion rods (65) has a drive plate (63) connected to the top end. The drive plate (63) is connected to a U-shaped rod (62). The second lifting frame (58) is installed in the middle of the bottom. The top end of the output shaft of the third electric telescopic rod is connected to the middle plate (59). Insert plates (60) are movably inserted into the slots on both ends of the middle plate (59). One end of the insert plate (60) is connected to the drive frame (61). The drive frame (61) is movably sleeved on the U-shaped rod (62).

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