Injection molding equipment based on plastic waste recycling

Abstract

The application discloses a kind of based on plastic waste recovery injection molding equipment, it is related to injection molding technical field, including frame, upper end is fixed with injection molding component, the injection molding component is driven by conveying motor;Heating equipment is wrapped in the outer wall of the injection molding component, and its heating temperature is stepwise heating;Hopper component is fixed above the injection molding component;Feeding equipment is erected on the frame, and discharge port corresponds with the hopper component, the feeding equipment is intermittent feeding;Drying equipment is connected with the position close to the lower side of the hopper component using pipeline;Clamping equipment is fixed on the frame, and is communicated with the output end of the injection molding component.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, specifically to an injection molding equipment based on the recycling of plastic waste. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of injection molding include high production speed and efficiency, automated operation, a wide variety of designs and shapes (from simple to complex), and sizes ranging from large to small. It also produces dimensionally accurate products, facilitates product updates and replacements, and can create complex shapes. Injection molding is suitable for mass production and molding processes involving complex shapes.

[0003] Existing injection molding equipment requires washing and crushing plastic waste for recycling. After washing and crushing, the waste has a high moisture content, and directly feeding it into the hopper causes the waste to stick together and easily clog the feed inlet. The current solution is to use a vibrating screen, but the vibration amplitude is limited, and some waste is easily stuck in the screen holes, causing the material to be interrupted and affecting the material conveying speed. In addition, the fluidity of the injection molding machine melt is unstable, resulting in too many air bubbles inside, leading to a high defect rate of the molded products.

[0004] To address the above problems, this invention provides an injection molding equipment based on plastic waste recycling to solve these issues. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: an injection molding equipment based on plastic waste recycling, comprising:

[0006] A frame, on the upper end of which is fixed an injection molding assembly, the injection molding assembly being driven by a conveyor motor;

[0007] The heating device is wrapped around the outer wall of the injection molding component, and its heating temperature is stepped.

[0008] The hopper assembly is fixed above the injection molding assembly;

[0009] The feeding device is mounted on the frame, and the discharge port corresponds to the hopper assembly. The feeding device is intermittent.

[0010] The drying equipment is connected to the hopper assembly near its lower part via a pipe;

[0011] The mold clamping device is fixed on the frame and connected to the output end of the injection molding assembly.

[0012] Further, preferably, the injection molding assembly includes:

[0013] The feeding cylinder is connected to the output end of the hopper assembly;

[0014] A feeding screw is rotatably disposed inside the conveying cylinder and connected to the output end of the conveying motor. The feeding screw is located below the hopper assembly.

[0015] A compression screw is fixed at the end of the feeding screw away from the conveying motor;

[0016] A melting screw is fixed at the end of the conveying and compressing screw away from the feeding screw.

[0017] Furthermore, preferably, the feed screw and the melting screw have the same pitch and direction of rotation, the compression screw has a smaller pitch than the feed screw, and the direction of rotation of the compression screw is opposite to that of the feed screw. An exhaust groove is provided on the upper part of the inner wall of the conveying cylinder at a position corresponding to the feed screw.

[0018] Further, preferably, the hopper assembly includes:

[0019] The hopper has an exhaust ring fixed on its side wall near the top, and the exhaust ring has an exhaust hole with a diameter smaller than the waste particle size.

[0020] An exhaust chamber is fixed to the outer wall of the hopper and corresponds to the exhaust ring. The exhaust chamber is connected to an external negative pressure device.

[0021] The oscillation assembly is fixed inside the hopper using multiple fixing columns;

[0022] The driving component is slidably mounted within the oscillation component using a sliding column;

[0023] The screening disc is fixed to the outer wall of the drive assembly and is slidably arranged with respect to the inner wall of the hopper;

[0024] A drive shaft is rotatably disposed inside the hopper, with one end extending out of the hopper and connected to an external motor, and the other end being equipped with a bevel gear set;

[0025] The feeding screw is rotatably mounted at the bottom of the hopper and is connected to the drive shaft by a bevel gear set.

[0026] Furthermore, preferably, all of the fixing posts are cylindrical, and the fixing posts are arranged in an alternating pattern.

[0027] Further, preferably, the oscillation component includes:

[0028] The fixed cylinder has a shock chamber and a buffer chamber arranged sequentially from bottom to top inside.

[0029] Two flexible capsules are configured and fixed to the upper and lower end faces of the buffer chamber, respectively, and the flexible capsules are filled with buffer solution.

[0030] A magnetic pad is fixed on one side of the two flexible capsules that are close to each other.

[0031] Furthermore, preferably, the sliding column is located within the oscillation assembly and is fixed with an oscillation disk and a buffer disk from bottom to top. Magnetic pads are fixed to both the upper and lower end faces of the buffer disk. The oscillation disk is slidably disposed within the oscillation chamber and is provided with two oscillation springs between it and the oscillation chamber. The buffer disk is slidably disposed within the buffer chamber, and both magnetic pads are made of flexible material.

[0032] Further, preferably, the driving component includes:

[0033] The drive disc is fixed to the bottom of the sliding column, and its side wall is provided with a guide surface;

[0034] The first drive column and the second drive column are symmetrically fixed to the lower end face of the drive disk, and the length of the second drive column is longer than the length of the first drive column.

[0035] A rack is provided on the side of the first drive column and the second drive column that are close to each other;

[0036] A drive tooth is fixed on the drive shaft, and only a quarter of the drive tooth is fixed with teeth, which mesh with the rack for drive.

[0037] Compared with the prior art, the present invention provides an injection molding equipment based on plastic waste recycling, which has the following beneficial effects:

[0038] In this invention, a feeding screw (large pitch) conveys the material, while a compression screw (small pitch, counter-rotating) generates strong shearing, compression, and reverses the material flow direction, forcing the gas and volatiles in the melt to converge and be discharged into the exhaust trough. The melting screw completes the final homogenization and plasticization, reducing the gas in the melt and preventing the formation of bubbles. The drive teeth periodically mesh with the racks on the first and second drive columns, generating intermittent up-and-down driving forces, causing the drive disc to drive the screening disc to slide and oscillate up and down. The magnetic pad two of the buffer disc generates magnetic force with the magnetic pad one fixed on the flexible bladder, which, together with the buffer fluid inside the bladder, forms a motion characteristic of strong oscillation start and flexible buffer stop. While the strong oscillation is occurring, the stress on the sliding column is reduced, improving its service life. Furthermore, during the strong oscillation, the waste material is thrown up and dropped, allowing the drying gas to fully dry the waste material and improve its dryness. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of an injection molding equipment based on plastic waste recycling;

[0040] Figure 2This is a schematic diagram of the injection molding component structure of an injection molding equipment based on plastic waste recycling;

[0041] Figure 3 This is a schematic diagram of the hopper assembly structure of an injection molding equipment based on plastic waste recycling;

[0042] Figure 4 This is a schematic diagram of the vibration component structure of an injection molding equipment based on plastic waste recycling;

[0043] Figure 5 This is a schematic diagram of the drive component structure of an injection molding equipment based on plastic waste recycling;

[0044] In the diagram: 1. Frame; 2. Injection molding assembly; 3. Conveyor motor; 4. Heating equipment; 5. Hopper assembly; 6. Drying equipment; 7. Mold clamping equipment; 21. Material conveyor cylinder; 22. Feeding screw; 23. Compression screw; 24. Melting screw; 25. Venting channel; 51. Hopper; 52. Venting ring; 53. Venting chamber; 54. Vibrating assembly; 55. Fixed column; 56. Drive assembly; 57. Sliding column; 58. Screening disc; 59. Drive shaft; 591. Bevel gear set; 592. Feeding screw; 541. Fixed cylinder; 542. Vibration chamber; 543. Vibration spring; 544. Buffer chamber; 545. Flexible bladder; 546. Magnetic pad one; 561. Drive disc; 562. Guide surface; 563. First drive column; 564. Second drive column; 565. Drive gear; 571. Vibration disc; 572. Buffer disc; 573. Magnetic pad two. Detailed Implementation

[0045] Reference Figures 1-5 This invention provides a technical solution: an injection molding equipment based on plastic waste recycling, comprising:

[0046] The frame 1 has an injection molding assembly 2 fixed at its upper end, and the injection molding assembly 2 is driven by a conveyor motor 3.

[0047] Heating device 4 is wrapped around the outer wall of the injection molding component 2, and its heating temperature is stepped.

[0048] The hopper assembly 5 is fixed above the injection molding assembly 2;

[0049] The feeding device is mounted on the frame 1, and the discharge port corresponds to the hopper assembly 5. The feeding device is intermittent.

[0050] The drying equipment 6 is connected to the hopper assembly 5 near its lower part via a pipe;

[0051] The mold clamping device 7 is fixed on the frame 1 and is connected to the output end of the injection molding assembly 2.

[0052] In other words, intermittent feeding by the feeding equipment can prevent waste from accumulating in the hopper assembly 5 and affecting the drying effect.

[0053] In this embodiment, the injection molding assembly 2 includes:

[0054] The feed cylinder 21 is connected to the output end of the hopper assembly 5;

[0055] The feeding screw 22 is rotatably disposed inside the conveying cylinder 21 and connected to the output end of the conveying motor 3. The feeding screw 22 is located below the hopper assembly 5.

[0056] The compression screw 23 is fixed at the end of the feeding screw 22 away from the conveying motor 3;

[0057] The melting screw 24 is fixed at the end of the conveying and compressing screw 23 away from the feeding screw 22.

[0058] In a preferred embodiment, the feed screw 22 and the melting screw 24 have the same pitch and direction of rotation. The pitch of the compression screw 23 is smaller than that of the feed screw 22, and the direction of rotation of the compression screw 23 is opposite to that of the feed screw 22. An exhaust groove 25 is provided on the upper part of the inner wall of the conveying cylinder 21 at a position corresponding to the feed screw 22.

[0059] The material is conveyed by the feeding screw 22 (large pitch), the compression screw 23 (small pitch, reverse rotation) forms strong shear, compression and reverses the flow of the material, forcing the gas and volatiles in the melt to converge and be discharged to the exhaust groove 25, and the melting screw 24 completes the final homogenization and plasticization, reduces the gas in the melt and prevents the generation of bubbles.

[0060] In a preferred embodiment, the hopper assembly 5 includes:

[0061] The hopper 51 has an exhaust ring 52 fixed on its side wall near the top. The exhaust ring 52 has an exhaust hole, the diameter of which is smaller than the waste particle size.

[0062] The exhaust chamber 53 is fixed to the outer wall of the hopper 51 and corresponds to the exhaust ring 52. The exhaust chamber 53 is connected to an external negative pressure device.

[0063] The oscillation assembly 54 is fixed inside the hopper 51 by multiple fixing columns 55;

[0064] The drive component 56 is slidably disposed within the oscillation component 54 using a sliding column 57;

[0065] The screening disc 58 is fixed to the outer wall of the drive assembly 56 and is slidably arranged with respect to the inner wall of the hopper 51.

[0066] A drive shaft 59 is rotatably disposed inside the hopper 51, with one end extending out of the hopper 51 and connected to an external motor, and a bevel gear set 591 installed at the other end.

[0067] The feeding screw 592 is rotatably mounted at the bottom of the hopper 51 and is connected to the drive shaft 59 by a bevel gear set 591.

[0068] It should be noted that the negative pressure adsorption force of the external negative pressure device connected to the exhaust chamber 53 is insufficient to adsorb waste material. To avoid waste material clogging the exhaust port, the feeding screw 592 must ensure that the total amount of waste material in the feeding cylinder 21 located at the feeding screw 22 does not contact the exhaust groove 25, so as to facilitate the exhaust groove 25 to exhaust.

[0069] In a preferred embodiment, all of the plurality of fixing posts 55 are cylinders, and the plurality of fixing posts 55 are arranged in an alternating manner.

[0070] In other words, when the waste falls, it can be initially broken up by multiple fixed columns 55. After the waste falls onto the screening plate 58, the drive component 56 drives the vibration component 54 to vibrate, causing the waste to be thrown up and hit the fixed columns 55 again for secondary breaking up. This improves the drying degree of the waste and can break it up again when it falls, further preventing the waste from sticking together.

[0071] In a preferred embodiment, the oscillation component 54 includes:

[0072] The fixed cylinder 541 has, from bottom to top, a vibration chamber 542 and a buffer chamber 544.

[0073] Two flexible capsules 545 are configured and fixed to the upper and lower end faces of the buffer chamber 544 respectively, and the flexible capsules 545 are filled with buffer solution.

[0074] Magnetic pad 546 is fixed on one side of the two flexible capsules 545 that are close to each other.

[0075] In a preferred embodiment, the sliding column 57 is located within the oscillation assembly 54, where an oscillation disk 571 and a buffer disk 572 are fixed from bottom to top. Magnetic pads 573 are fixed to both the upper and lower end faces of the buffer disk 572. The oscillation disk 571 is slidably disposed within the oscillation chamber 542, and two oscillation springs 543 are disposed between it and the oscillation chamber 542. The buffer disk 572 is slidably disposed within the buffer chamber 544. Both the first magnetic pad 546 and the second magnetic pad 573 are made of flexible material.

[0076] The magnetic pad 573 of the buffer plate 572 and the magnetic pad 546 fixed on the flexible bladder 545 generate magnetic force, which, together with the buffer fluid in the bladder, forms a motion characteristic of strong oscillation start and flexible buffer stop, thereby increasing the protection of the sliding column 57 while increasing the oscillation intensity.

[0077] In a preferred embodiment, the driving component 56 includes:

[0078] The drive disk 561 is fixed to the bottom of the sliding column 57, and its side wall is provided with a guide surface 562.

[0079] The first drive column 563 and the second drive column 564 are symmetrically fixed to the lower end face of the drive disk 561, and the length of the second drive column 564 is longer than the length of the first drive column 563.

[0080] A rack is provided on the side of the first drive post 563 and the second drive post 564 that are close to each other;

[0081] A drive tooth 565 is fixed on the drive shaft 59, and only a quarter of the drive tooth 565 is fixed with teeth, which mesh with the rack for drive.

[0082] It should be noted that the drive tooth 565 rotates counterclockwise. Its teeth first contact the second drive column 564, driving the drive disc 561 and screening disc 58 upwards at a uniform speed. After the teeth disengage from the second drive column 564, the oscillating disc 571 of the sliding column 57 compresses the upper oscillating spring 543. Then, the oscillating disc 571 quickly resets via the oscillating spring 543, causing the drive disc 561 and screening disc 58 to fall rapidly. Their falling speed is much greater than the falling speed of the waste material, thus dispersing the waste material and improving the drying effect. The teeth of the rear drive gear 565 contact the first drive column 563, causing the drive disc 561 and the screening disc 58 to move downward at a uniform speed. At this time, the oscillating disc 571 of the sliding column 57 compresses the oscillating spring 543 below. Then, the oscillating disc 571 quickly resets through the oscillating spring 543, thereby throwing up the waste material and further dispersing it. When the oscillating spring 543 resets, it is buffered by the flexible bladder 545, the magnetic pad 1 546, and the magnetic pad 2 573, which prevents the sliding column 57 from reciprocating with small amplitude vibrations and improves its mechanical life.

[0083] In practice, firstly, the hopper assembly 5 is intermittently fed by the feeding equipment. Then, the waste material is dried in the hopper assembly 5. After drying, it is added to the injection molding assembly 2. The waste material is conveyed and melted in the injection molding assembly 2. Then, it is extruded and injected into the mold closing assembly 7 through the outlet of the injection molding assembly 2. The mold closing assembly 7 is then pressure-held and cooled. After molding, the finished product is taken out from the mold closing assembly.

[0084] The above description is merely 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. An injection molding equipment based on plastic waste recycling, characterized in that, include: A frame (1) has an injection molding assembly (2) fixed at its upper end, the injection molding assembly (2) being driven by a conveyor motor (3); Heating device (4) is wrapped around the outer wall of the injection molding assembly (2), and its heating temperature is stepped heating; The hopper assembly (5) is fixed above the injection molding assembly (2); The feeding device is mounted on the frame (1) and the discharge port corresponds to the hopper assembly (5). The feeding device is intermittent. The drying equipment (6) is connected to the hopper assembly (5) near the bottom via a pipe; The mold clamping device (7) is fixed on the frame (1) and is connected to the output end of the injection molding assembly (2); The hopper assembly (5) includes: The hopper (51) has an exhaust ring (52) fixed on its side wall near the top. The exhaust ring (52) has an exhaust hole, and the diameter of the exhaust hole is smaller than the waste particle size. The exhaust chamber (53) is fixed to the outer wall of the hopper (51) and corresponds to the exhaust ring (52). The exhaust chamber (53) is connected to an external negative pressure device. The oscillation assembly (54) is fixed inside the hopper (51) by multiple fixing columns (55); The drive component (56) is slidably disposed within the oscillation component (54) using a sliding column (57); The screening disc (58) is fixed to the outer wall of the drive assembly (56) and is slidably arranged with respect to the inner wall of the hopper (51); A drive shaft (59) is rotatably disposed inside the hopper (51), with one end extending out of the hopper (51) and connected to an external motor, and a bevel gear set (591) installed at the other end. The feeding screw (592) is rotatably mounted at the bottom of the hopper (51) and is connected to the drive shaft (59) by a bevel gear set (591); The oscillation component (54) includes: The fixed cylinder (541) has an oscillation chamber (542) and a buffer chamber (544) arranged sequentially from bottom to top inside; Two flexible capsules (545) are configured and fixed to the upper and lower end faces of the buffer chamber (544) respectively, and the flexible capsules (545) are filled with buffer solution. Magnetic pad 1 (546) is fixed on one side of the two flexible capsules (545) that are close to each other; The sliding column (57) is located within the oscillation assembly (54) and is fixed from bottom to top with an oscillation disk (571) and a buffer disk (572). Magnetic pads (573) are fixed to both the upper and lower ends of the buffer disk (572). The oscillation disk (571) is slidably disposed within the oscillation chamber (542) and is provided with two oscillation springs (543) between it and the oscillation chamber (542). The buffer disk (572) is slidably disposed within the buffer chamber (544). Both the first magnetic pad (546) and the second magnetic pad (573) are made of flexible material. The driving component (56) includes: The drive disk (561) is fixed to the bottom of the sliding column (57), and its side wall is provided with a guide surface (562). The first drive column (563) and the second drive column (564) are symmetrically fixed to the lower end face of the drive disk (561), and the length of the second drive column (564) is longer than the length of the first drive column (563). A rack is provided on the side where the first drive post (563) and the second drive post (564) are close to each other; A drive tooth (565) is fixed on the drive shaft (59), and only a quarter of the drive tooth (565) is fixed with teeth, which mesh with the rack for drive.

2. The injection molding equipment based on plastic waste recycling according to claim 1, characterized in that, The injection molding assembly (2) includes: The feed cylinder (21) is connected to the output end of the hopper assembly (5); The feeding screw (22) is rotatably disposed inside the conveying cylinder (21) and connected to the output end of the conveying motor (3). The feeding screw (22) is located below the hopper assembly (5). A compression screw (23) is fixed at the end of the feeding screw (22) away from the conveying motor (3); The melting screw (24) is fixed at the end of the conveying compression screw (23) away from the feeding screw (22).

3. The injection molding equipment based on plastic waste recycling according to claim 2, characterized in that, The feed screw (22) and the melting screw (24) have the same pitch and direction of rotation. The pitch of the compression screw (23) is smaller than that of the feed screw (22), and the direction of rotation of the compression screw (23) is opposite to that of the feed screw (22). An exhaust groove (25) is provided on the upper part of the inner wall of the conveying cylinder (21) at a position corresponding to the feed screw (22).

4. The injection molding equipment based on plastic waste recycling according to claim 1, characterized in that, The plurality of fixed posts (55) are all cylinders, and the plurality of fixed posts (55) are arranged in an alternating manner.

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