PET plastic raw material grinding and stirring device
By designing a PET plastic raw material grinding device with adjustable spacing and replaceable grinding parts, the problem of poor grinding effect of PET raw materials of different materials was solved, achieving high efficiency, uniform powder particle size and equipment adaptability, and improving processing quality and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN XINLILAI PLASTIC TECH CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-26
AI Technical Summary
Existing PET plastic grinding equipment lacks a flexible grinding disc replacement mechanism, resulting in poor grinding effect for PET raw materials of different materials. Hard and brittle raw materials have low crushing efficiency, tough raw materials are prone to entanglement and jamming, the powder particle size is uneven, the equipment wear is serious, and the processing quality and efficiency are affected.
A PET plastic raw material grinding and mixing device was designed, including a moving grinding disc, a stationary grinding disc, an adjusting screw, and replaceable grinding parts. By adjusting the grinding disc spacing and replacing the grinding parts, it can adapt to the characteristics of different PET raw materials. Combined with the design of spiral groove and trapezoidal groove, it can achieve precise control of powder particle size and adapt to multiple raw materials.
It achieves efficient grinding of different PET raw materials, improves powder particle size uniformity by 15%-20%, increases initial crushing efficiency by 25%-30%, reduces equipment wear, and improves processing quality and efficiency.
Smart Images
Figure CN224408141U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of PET plastic processing technology, and in particular to a PET plastic raw material grinding and stirring device. Background Technology
[0002] PET (polyethylene terephthalate) is a widely used thermoplastic. Due to its high strength, chemical resistance, transparency, and recyclability, it is extensively used in packaging materials (such as beverage bottles and food containers), fibers (polyester), and electronic device housings. In the recycling or modification of PET, it is often necessary to crush, grind, and mix it with additives (such as plasticizers, masterbatches, and flame retardants) to prepare recycled or modified materials that meet different performance requirements.
[0003] In existing PET plastic raw material grinding processes, significant differences in raw material properties exist—from hard and brittle waste PET bottle flakes and unmodified PET granules to more resilient modified raw materials such as glass fiber reinforced PET and recycled PET granules. Furthermore, grinding equipment generally lacks a flexible grinding disc replacement mechanism, making it difficult to achieve grinding efficiency that caters to the characteristics of different materials. Specifically, hard and brittle raw materials suffer from low crushing efficiency due to insufficient shear force, while resilient or modified raw materials are prone to problems such as entanglement, jamming, and overheating due to poor grinding disc compatibility. Ultimately, this results in uneven powder particle size, increased equipment wear, and severely impacts subsequent processing quality and production efficiency. Utility Model Content
[0004] The purpose of this invention is to provide a PET plastic raw material grinding and mixing device to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a PET plastic raw material grinding and stirring device, comprising a stand, a grinding box, a grinding mechanism, a grinding drive mechanism, and a stirring mechanism. The stand is vertically arranged. The grinding box includes a first grinding cylinder and a second grinding cylinder. The first grinding cylinder is located on the stand, and the second grinding cylinder is hinged to the first grinding cylinder. A connection switch is provided between the first grinding cylinder and the second grinding cylinder. A feed pipe is provided at the top of the first grinding cylinder, and a discharge pipe is provided at the bottom of the first grinding cylinder. The grinding mechanism is located inside the grinding box and performs grinding operations on the plastic raw material within the grinding box. The grinding drive mechanism is located beside the stand and drives the grinding mechanism to rotate within the grinding box. The stirring mechanism is located beside the stand and is connected to the discharge pipe.
[0006] A further technical solution includes a grinding mechanism comprising a moving grinding disc, a stationary grinding disc, an adjusting screw, a turntable, and four connecting parts. The moving grinding disc is rotatably connected inside a first grinding cylinder, and the stationary grinding disc is located inside a second grinding cylinder. The second grinding cylinder has four sliders inside, and the stationary grinding disc has four grooves that slide with the sliders. The adjusting screw is threadedly connected to the second grinding cylinder and rotatably connected to the stationary grinding disc. The turntable is located on the adjusting screw. The moving grinding disc and the stationary grinding disc each have two grinding elements, and the two grinding elements are connected to the moving grinding disc and the stationary grinding disc through the four connecting parts.
[0007] In a further technical solution, each of the connecting parts includes a snap-fit block and a snap-fit spring. The side walls of the moving grinding disc and the stationary grinding disc are provided with four sliding grooves. The snap-fit spring is connected to one end of the snap-fit block, and the snap-fit block is slidably connected in the sliding groove. The side wall of the grinding part is provided with an insertion groove for the other end of the snap-fit block to be inserted.
[0008] In a further technical solution, the grinding element is a circularly arranged spiral groove grinding disc.
[0009] In a further technical solution, the grinding element is a circularly arranged trapezoidal groove grinding disc.
[0010] In a further technical solution, the grinding drive mechanism includes a drive motor, a first pulley group, a second pulley group, and a belt group. The first pulley group is rotatably connected to the first grinding cylinder and is connected to the moving grinding disc. The drive motor is located on the side of the stand. The second pulley group is located on the main shaft of the drive motor. The belt group is sleeved on the first pulley group and the second pulley group.
[0011] A further technical solution is provided, wherein the stirring mechanism includes a stirring drum, a stirring motor, a stirring auger, and a discharge port. The stirring drum is horizontally arranged on the side of the stand and connected to the discharge pipe. The stirring motor is located on the stirring drum and is drivenly connected to the stirring auger. The stirring auger is rotatably connected inside the stirring drum. The discharge port is located below the stirring drum. The stirring drum is provided with a feed inlet.
[0012] The beneficial effects of this utility model are:
[0013] This invention delivers plastic raw materials through a feeding pipe to the space between the moving and stationary grinding discs. The grinding drive mechanism then rotates the moving grinding disc within the first grinding cylinder, grinding the plastic raw materials. During this process, the rotating disc drives the adjusting screw to rotate on the second grinding cylinder and on the stationary grinding disc. This allows the four grooves on the stationary grinding disc to move on four sliders, changing the distance between the stationary and moving grinding discs. This enables precise control of the grinding particle size and adaptability to various raw material characteristics.
[0014] When grinding different types of plastic raw materials, different types of grinding parts can be selected for replacement. The locking block can be moved in the sliding groove to move out of the insertion groove for replacement of the grinding part. After replacing the grinding part, the locking block can be moved again to lock the grinding part into the moving or stationary grinding disc. Releasing the locking block allows the locking spring to reset the locking block into the locking groove, thus achieving a fixed connection between the grinding part and the moving or stationary grinding disc, thereby adapting to the grinding needs of different types of plastic raw materials.
[0015] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description
[0016] Figure 1 Schematic diagram of the three-dimensional structure of this utility model Figure 1 .
[0017] Figure 2 Schematic diagram of the three-dimensional structure of this utility model Figure 2 .
[0018] Figure 3 : A three-dimensional structural diagram of the first grinding cylinder of this utility model.
[0019] Figure 4 : A three-dimensional structural diagram of the second grinding cylinder of this utility model.
[0020] Figure 5 : A three-dimensional structural exploded view of the second grinding cylinder of this utility model.
[0021] Figure 6 : A three-dimensional structural diagram of the connector of this utility model.
[0022] Figure 7 : A three-dimensional structural diagram of the stirring mechanism of this utility model.
[0023] Figure 8 : A three-dimensional structural diagram of the trapezoidal groove grinding disc of this utility model.
[0024] Reference numerals: 1. Stand; 2. Grinding box; 21. First grinding cylinder; 22. Second grinding cylinder; 24. Feed pipe; 25. Discharge pipe; 26. Slider; 3. Grinding mechanism; 30. Insertion groove; 31. Moving grinding disc; 32. Stationary grinding disc; 33. Adjusting screw; 34. Turntable; 35. Slide groove; 36. Snap-fit block; 37. Snap-fit spring; 38. Spiral groove grinding disc; 39. Trapezoidal groove grinding disc; 4. Grinding drive mechanism; 41. Drive motor; 42. First pulley group; 43. Second pulley group; 44. Belt group; 5. Stirring mechanism; 51. Stirring cylinder; 52. Stirring motor; 53. Stirring auger; 54. Discharge port; 55. Feed port. Detailed Implementation
[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0026] Please refer to Figure 1-8 As shown; This utility model provides a technical solution for a PET plastic raw material grinding and stirring device: A PET plastic raw material grinding and stirring device includes a stand 1, a grinding box 2, a grinding mechanism 3, a grinding drive mechanism 4, and a stirring mechanism 5. The stand 1 is vertically arranged. The grinding box 2 includes a first grinding cylinder 21 and a second grinding cylinder 22. The first grinding cylinder 21 is located on the stand 1, and the second grinding cylinder 22 is hinged to the first grinding cylinder 21. A connecting switch is provided between the first grinding cylinder 21 and the second grinding cylinder 22. The connecting switch is used to close the first grinding cylinder and the second grinding cylinder during grinding. The first grinding cylinder 21 is closed and locked. The top of the first grinding cylinder 21 is provided with a feed pipe 24, which can transport plastic raw materials into the first grinding cylinder 21. The discharge pipe 25 can transport the plastic raw materials after grinding to the subsequent stirring mechanism 5. The bottom of the first grinding cylinder 21 is provided with a discharge pipe 25. The grinding mechanism 3 is located inside the grinding box 2 and performs grinding work on the plastic raw materials inside the grinding box 2. The grinding drive mechanism 4 is located on the side of the stand 1. The grinding drive mechanism 4 drives the grinding mechanism 3 to rotate inside the grinding box 2. The stirring mechanism 5 is located on the side of the stand 1 and is connected to the discharge pipe 25.
[0027] In this embodiment, the grinding mechanism 3 includes a moving grinding disc 31, a stationary grinding disc 32, an adjusting screw 33, a turntable 34, and four connecting parts. The moving grinding disc 31 is rotatably connected inside the first grinding cylinder 21. The stationary grinding disc 32 is located inside the second grinding cylinder 22. The second grinding cylinder 22 is provided with four sliders 26. The stationary grinding disc 32 is provided with four sliding grooves 35 that slide with the sliders 26. The adjusting screw 33 is threadedly connected to the second grinding cylinder 22. The adjusting screw 33 is rotatably connected to the stationary grinding disc 32. The turntable 34 is located on the adjusting screw 33. The moving grinding disc 31 and the stationary grinding disc 32 are each provided with two grinding elements. The two grinding elements are connected to the moving grinding disc 31 and the stationary grinding disc 32 through the four connecting parts.
[0028] After the plastic raw material is conveyed to the space between the moving grinding disc 31 and the stationary grinding disc 32 through the feed pipe 24, the grinding drive mechanism 4 drives the moving grinding disc 31 to rotate inside the first grinding cylinder 21, so that the moving grinding disc 31 rotates on the stationary grinding disc 32 to grind the plastic raw material. During this process, the rotating turntable 34 can drive the adjusting screw 33 to rotate on the second grinding cylinder 22 and on the stationary grinding disc 32, so that the four sliding grooves 35 on the stationary grinding disc 32 can move on the four sliders 26 respectively, changing the distance between the stationary grinding disc 32 and the moving grinding disc 31.
[0029] Precise control of grinding particle size: By changing the distance between the two grinding discs, the particle size of the powder can be precisely controlled. For example, reducing the distance enhances the shearing and extrusion effect of the moving grinding disc 31 and the stationary grinding disc 32 on the plastic raw material, which is suitable for grinding hard and brittle PET bottle flakes into fine powder of 100 mesh or more to meet the needs of high-end injection molding, spinning and other processes; increasing the distance can be used for coarse grinding of tough or modified PET raw materials, such as initially crushing glass fiber reinforced PET into 30-50 mesh particles to prepare for subsequent processes.
[0030] Adaptable to diverse raw material characteristics: PET raw materials exhibit significant differences in properties. Hard and brittle materials are easily crushed, but excessive grinding force may result in overly fine powder and generate a large amount of dust. Tough or modified materials require stronger shearing force to crush and are prone to sticking together due to localized overheating. The adjustable spacing design allows the equipment to flexibly adapt to different raw materials. When processing waste PET bottle flakes, appropriately reducing the spacing improves grinding precision; when dealing with tough materials such as recycled PET granules, increasing the spacing and using a slower rotation speed ensures crushing effectiveness while preventing the raw material from melting due to excessive friction.
[0031] In this embodiment, each of the connecting components includes a snap-fit block 36 and a snap-fit spring 37. The sidewalls of the moving grinding disc 31 and the stationary grinding disc 32 are provided with four sliding grooves. The snap-fit spring 37 is connected to one end of the snap-fit block 36. The snap-fit block 36 is slidably connected in the sliding groove. The sidewall of the grinding component is provided with an insertion groove 30 for the other end of the snap-fit block 36 to be inserted.
[0032] When grinding different types of plastic raw materials, different types of grinding parts can be selected for replacement. The locking block 36 can be moved in the sliding groove to move out of the insertion groove 30 to replace the grinding part. After replacing the new grinding part, the locking block 36 can be moved again to lock the grinding part into the moving grinding disc 31 or the stationary grinding disc 32. Releasing the locking block 36 and resetting it through the locking spring 37 will return the locking block 36 to the locking groove, thereby achieving a fixed connection between the grinding part and the moving grinding disc 31 or the stationary grinding disc 32, thus adapting to the grinding needs of different types of plastic raw materials.
[0033] In this embodiment, refer to Figure 5 As shown, the grinding component is a circular spiral grooved grinding disc 38.
[0034] The directional pushing function of spiral grooves: The spiral design of the spiral grooves (such as equidistant spirals or variable-pitch spirals) generates axial thrust when the grinding disc rotates, pushing the plastic raw material entering the grinding area along the spiral trajectory from the center of the grinding disc to the edge. Compared with traditional straight-groove grinding discs, this "dynamic conveying" characteristic avoids the accumulation of raw materials in the central area, and is especially suitable for plastics with high toughness (such as modified PET, PE, etc.), reducing the jamming problem caused by material entanglement.
[0035] Extending the material grinding path: The curved trajectory of the spiral groove lengthens the movement path of the raw material within the grinding zone (for example, the spiral length from the center to the edge is 2-3 times the straight-line distance), requiring the raw material to undergo more shearing, compression, and friction. Taking brittle PET bottle flakes as an example, the spiral groove allows them to complete multi-stage processing of "crushing-grinding-refining" between the grinding discs, ultimately improving the uniformity of powder particle size by approximately 15%-20%.
[0036] In this embodiment, refer to Figure 8 As shown, the grinding component is a circularly arranged trapezoidal groove grinding disc 39.
[0037] The wedge-shaped shearing mechanism of the trapezoidal groove: The trapezoidal groove's structure, wider at the top and narrower at the bottom (similar to a wedge), generates a combined "compression-shearing-splitting" force on the raw material as the grinding disc rotates. When hard and brittle plastics (such as waste PET bottle flakes and PVC fragments) enter the groove, the inclined edge of the trapezoidal groove cuts into the material like a blade. Utilizing the stress concentration effect of the wedge angle (typically 30°-60°), the raw material cracks and breaks upon contact. Compared to straight-groove grinding discs, trapezoidal grooves improve the initial crushing efficiency of hard and brittle materials by approximately 25%-30%, making them particularly suitable for applications requiring rapid refining.
[0038] Variable cross-section grinding path design: The depth of the trapezoidal groove gradually changes from the center to the edge of the grinding disc (e.g., 10mm deep in the center groove and 5mm deep in the edge groove), forming a graded grinding zone of "coarse grinding - fine grinding". Taking unmodified PET granules as an example, the raw material first undergoes preliminary crushing in the central deep groove area through a larger space, and then, as it moves to the shallow edge groove area, secondary refinement is achieved due to the narrowing groove width and increased shear force. This design can reduce the particle size distribution bandwidth of the final powder by 15%-20% and increase the yield of fine powder (≤100 mesh) by about 10%.
[0039] In this embodiment, the grinding drive mechanism 4 includes a drive motor 41, a first pulley group 42, a second pulley group 43, and a belt group 44. The first pulley group 42 is rotatably connected to the first grinding cylinder 21 and is connected to the moving grinding disc 31. The drive motor 41 is located on the side of the stand 1. The second pulley group 43 is located on the main shaft of the drive motor 41. The belt group 44 is sleeved on the first pulley group 42 and the second pulley group 43.
[0040] When the drive motor 41 operates, it drives the second pulley group 43 to rotate, which in turn drives the first pulley group 42 to rotate via the belt group 44. This causes the moving grinding disc 31 to rotate inside the first grinding cylinder 21. The moving grinding disc 31 rotates on the stationary grinding disc 32 to grind the plastic raw materials.
[0041] In this embodiment, the stirring mechanism 5 includes a stirring drum 51, a stirring motor 52, a stirring auger 53, and a discharge port 54. The stirring drum 51 is horizontally arranged beside the support 1 and connected to the discharge pipe 25. The stirring motor 52 is located on the stirring drum 51 and is connected to the stirring auger 53. The stirring auger 53 is rotatably connected inside the stirring drum 51. The discharge port 54 is located below the stirring drum 51. The stirring drum 51 is provided with a feed inlet 55.
[0042] After the plastic raw material is ground into powder, the discharge pipe 25 conveys the raw material into the mixing drum 51, and the feed port 55 conveys the additives that need to be stirred into the mixing drum 51. Then, the stirring motor 52 drives the stirring auger 53 to rotate in the mixing drum 51. First, it can stir and mix the additives and the plastic raw material, and second, it can also dissipate heat from the ground plastic raw material.
[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A PET plastic raw material grinding and mixing device, characterized in that: The system includes a stand (1), a grinding box (2), a grinding mechanism (3), a grinding drive mechanism (4), and a stirring mechanism (5). The stand (1) is vertically arranged. The grinding box (2) includes a first grinding cylinder (21) and a second grinding cylinder (22). The first grinding cylinder (21) is located on the stand (1), and the second grinding cylinder (22) is hinged to the first grinding cylinder (21). A connecting switch is provided between the first grinding cylinder (21) and the second grinding cylinder (22). The top of the cylinder (21) is provided with a feed pipe (24), and the bottom of the first grinding cylinder (21) is provided with a discharge pipe (25). The grinding mechanism (3) is located inside the grinding box (2) and performs grinding work on plastic raw materials inside the grinding box (2). The grinding drive mechanism (4) is located on the side of the stand (1). The grinding drive mechanism (4) drives the grinding mechanism (3) to rotate inside the grinding box (2). The stirring mechanism (5) is located on the side of the stand (1) and is connected to the discharge pipe (25).
2. The PET plastic raw material grinding and mixing device according to claim 1, characterized in that: The grinding mechanism (3) includes a moving grinding disc (31), a stationary grinding disc (32), an adjusting screw (33), a turntable (34), and four connecting parts. The moving grinding disc (31) is rotatably connected inside the first grinding cylinder (21). The stationary grinding disc (32) is located inside the second grinding cylinder (22). The second grinding cylinder (22) is provided with four sliders (26). The stationary grinding disc (32) is provided with four sliding grooves (35) that slide with the sliders (26). The adjusting screw (33) is threadedly connected to the second grinding cylinder (22). The adjusting screw (33) is rotatably connected to the stationary grinding disc (32). The turntable (34) is located on the adjusting screw (33). The moving grinding disc (31) and the stationary grinding disc (32) are each provided with two grinding parts. The two grinding parts are connected to the moving grinding disc (31) and the stationary grinding disc (32) through the four connecting parts.
3. The PET plastic raw material grinding and mixing device according to claim 2, characterized in that: Each of the connecting parts includes a snap-fit block (36) and a snap-fit spring (37). The side walls of the moving grinding disc (31) and the stationary grinding disc (32) are provided with four sliding grooves. The snap-fit spring (37) is connected to one end of the snap-fit block (36). The snap-fit block (36) is slidably connected in the sliding groove. The side wall of the grinding part is provided with an insertion groove (30) for the other end of the snap-fit block (36) to be inserted.
4. The PET plastic raw material grinding and mixing device according to claim 3, characterized in that: The grinding component is a circular spiral groove grinding disc (38).
5. The PET plastic raw material grinding and mixing device according to claim 3, characterized in that: The grinding element is a circular trapezoidal groove grinding disc (39).
6. The PET plastic raw material grinding and mixing device according to claim 2, characterized in that: The grinding drive mechanism (4) includes a drive motor (41), a first pulley group (42), a second pulley group (43), and a belt group (44). The first pulley group (42) is rotatably connected to the first grinding cylinder (21) and is connected to the moving grinding disc (31). The drive motor (41) is located on the side of the stand (1). The second pulley group (43) is located on the main shaft of the drive motor (41). The belt group (44) is sleeved on the first pulley group (42) and the second pulley group (43).
7. The PET plastic raw material grinding and mixing device according to claim 1, characterized in that: The stirring mechanism (5) includes a stirring drum (51), a stirring motor (52), a stirring auger (53), and a discharge port (54). The stirring drum (51) is horizontally arranged on the side of the stand (1) and connected to the discharge pipe (25). The stirring motor (52) is located on the stirring drum (51) and is connected to the stirring auger (53). The stirring auger (53) is rotatably connected inside the stirring drum (51). The discharge port (54) is located below the stirring drum (51). The stirring drum (51) is provided with a feed inlet (55).