Plastic recycling and color mixing device

Abstract

The invention relates to the technical field of plastic recycling, in particular to a plastic recycling and color mixing device. The plastic recycling and color mixing device comprises a plastic color mixing machine, a discharging pipe is arranged on the bottom wall of the plastic color mixing machine, the top of the plastic color mixing machine is rotationally connected with a machine cover, a servo motor is installed at the bottom of the plastic color mixing machine, and an output shaft of the servo motor is connected with a first stirring rod through a coupler; and a premixing piece is arranged in the plastic color mixer. According to the invention, a premixing-final mixing double-stage process is adopted, and the toner can be uniformly dispersed in the plastic raw material through a two-stage mixing process, so that the purpose of reducing the chromatic aberration problem is achieved, and the mixing uniformity is improved; after the premixing stage is finished, the discharging hole of the premixing part can be opened through cooperation of the moving rack and the rotating part, and then the pushing-in part is matched to push materials into the discharging hole, so that the color master batch prototypes in the premixing part can be quickly transferred into the plastic color mixing machine, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic recycling, and in particular to a plastic recycling and color mixing device. Background Art

[0002] Plastics are widely used lightweight and highly durable materials, and the surge in waste poses a serious threat to the ecology (such as pollution and the spread of microplastics). Recycling and reuse is a key way to alleviate resource consumption and environmental pollution, and is in line with global sustainable development goals.

[0003] When producing plastic products, in order to meet customer requirements and produce products of specific colors, the plastics need to be mixed to achieve the required color. The raw materials of plastics are generally powdered materials, or granular materials. Traditional color mixing equipment directly mixes the color powder with the plastic raw materials (granules / powders), which causes the color powder to easily agglomerate and is difficult to evenly penetrate into each plastic particle, resulting in color difference problems in the mixed products.

[0004] Based on the above situation, the present invention proposes a plastic recycling and color mixing device, which adopts a pre-mixing-final mixing two-stage process to ensure that the color powder can be evenly dispersed in the plastic raw material through a two-stage mixing process. Summary of the invention

[0005] In order to overcome the shortcomings of traditional color mixing equipment that color powder is easy to agglomerate and difficult to evenly penetrate into each plastic particle, resulting in color difference, the present invention proposes a plastic recycling and color mixing device.

[0006] The technical solution is: a plastic recycling and color mixing device, including a plastic color mixer, the bottom wall of the plastic color mixer is provided with a discharge pipe, the top of the plastic color mixer is rotatably connected with a cover, a servo motor is installed at the bottom of the plastic color mixer, the output shaft of the servo motor is connected to a first stirring rod through a coupling, a premixer is provided in the plastic color mixer, a frustum is fixedly connected to the bottom wall of the premixer, and a second stirring rod is also connected to the output shaft of the servo motor.

[0007] Furthermore, the bottom of the premix is ​​rotatably connected to a rotating member, and the bottom wall of the premix and the rotating member are both provided with evenly distributed arc-shaped discharge holes, and the arc-shaped discharge holes on the rotating member and the premix are staggered. The purpose is to allow the premix to transfer the "masterbatch prototype" to the plastic color mixer by rotating the rotating member.

[0008] Furthermore, the plastic color mixer is slidably connected with a moving rack, the rotating member is provided with a gear, the moving rack and the rotating member are meshed with each other, and the plastic color mixer has a pin assembly near the outer end of the moving rack. Through the meshing of the gear and the moving rack, the rotating member can be rotated to control the discharge of the premix.

[0009] Furthermore, the latch assembly includes a buckle slidably connected to the plastic color mixer, and a first spring is connected between the buckle and the plastic color mixer. The first spring is wound around the buckle, and two jacks are provided on the moving rack. The purpose is to prevent the moving rack from sliding during the operation of the device and control the distance of the outward pull of the moving rack, so that the rotation angle of the rotating part can be fixed.

[0010] Furthermore, a plurality of arc-shaped pushing members are slidably connected to the bottom wall of the premixing member in the circumferential direction. A second rack is fixedly connected to the outer side of the pushing member, and the second rack slides on the outer wall of the premixing member. A multiple-distance assembly is provided on the premixing member. Since the premixing volume accounts for 10%-15%, the space between the premixing member and the plastic color mixer is limited, and the inward movement distance of the pushing member can realize material pushing without being restricted by space.

[0011] Furthermore, the multiple-distance assembly includes elastic telescopic members fixedly connected to the outer wall of the premixing member in the circumferential direction. A second spring is connected between the telescopic end of each elastic telescopic member and the premixing member. A second wedge block is fixedly connected to the telescopic end of the elastic telescopic member along the longitudinal direction, and a first wedge block is fixedly connected to the telescopic end of the elastic telescopic member along the transverse direction. A gear is rotatably connected to both the first wedge block and the second wedge block. A first rack evenly distributed in the circumferential direction is fixedly connected to the outer wall of the premixing member, and the gear meshes with the adjacent first rack and second rack.

[0012] Furthermore, a multi-section electric push rod of the power source is provided on the premixing member, and a pressing member is fixedly connected to the telescopic end of the multi-section electric push rod. When the pressing member moves downward, it will squeeze the first wedge block and the second wedge block, causing the pushing member to move inward to push the material.

[0013] Furthermore, it consists of an inner and an outer circle. A plurality of chutes evenly distributed in the circumferential direction are provided on the outer wall of the upper part of the premixing member. The inner circle of the pressing member slides between the evenly distributed chutes, and the outer circle of the pressing member is in pressing fit with both the first wedge block and the second wedge block. The purpose is to enable the pressing member to move smoothly in the vertical direction when the multi-section electric push rod drives the pressing member to move downward.

[0014] Furthermore, the heights of the first wedge block and the second wedge block are arranged in a stepped manner. The purpose is that when the pressing member moves downward, it can contact the first wedge block and the second wedge block successively, so that the pushing members in the transverse and longitudinal directions can push the material alternately.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention adopts a pre-mixing - final mixing two-stage process. Through the mixing process of two stages, it ensures that the toner can be evenly dispersed in the plastic raw material, thereby achieving the purpose of reducing the color difference problem and improving the mixing uniformity. After the pre-mixing stage is completed, through the cooperation of the moving rack and the rotating member, the discharge hole of the pre-mixing member can be opened, and then the material is pushed into the discharge hole with the cooperation of the pushing member, so that the "color masterbatch prototype" in the pre-mixing member can be quickly transferred into the plastic color mixer, improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0017] Figure 2 is a partial three-dimensional structural sectional view of the present invention.

[0018] Figure 3 is a three-dimensional structural sectional view of components such as the pre-mixing member, the second stirring rod, and the rotating member of the present invention.

[0019] Figure 4 is a three-dimensional structural sectional view of components such as the moving rack, the buckle, and the first spring of the present invention.

[0020] Figure 5 is a three-dimensional structural sectional view of the pre-mixing member and the rotating member of the present invention.

[0021] Figure 6 is a three-dimensional structural sectional view of components such as the pressing member, the first wedge block, and the second wedge block of the present invention.

[0022] Figure 7 is a three-dimensional structural schematic diagram of the multi-stage electric push rod and the pressing member of the present invention.

[0023] Figure 8 is a three-dimensional structural sectional view of components such as the gear, the elastic telescopic member, and the second spring of the present invention.

[0024] In the above drawings: 1: Plastic color mixer, 11: Machine cover, 12: Servo motor, 13: First stirring rod, 14: Pre-mixing member, 141: Conical frustum, 15: Second stirring rod, 16: Rotating member, 17: Moving rack, 18: Buckle, 19: First spring, 2: Multi-stage electric push rod, 21: Pressing member, 22: First wedge block, 23: Second wedge block, 24: Gear, 25: Elastic telescopic member, 26: Second spring, 27: First rack, 28: Second rack, 29: Pushing member. DETAILED DESCRIPTION OF THE INVENTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1: Refer to the attached Figures 1-5 A plastic recycling and color mixing device includes a plastic color mixer 1. The shell of the plastic color mixer 1 is a stainless steel cylindrical arrangement. The bottom of the plastic color mixer 1 is provided with a supporting foot. The bottom wall of the plastic color mixer 1 is provided with a discharge pipe, and the discharge pipe is controlled to open and close by a valve. The top of the plastic color mixer 1 is rotatably connected with a cover 11, and the cover 11 is provided with a handle. A servo motor 12 is installed at the bottom of the plastic color mixer 1. The output shaft of the servo motor 12 is connected to a first stirring rod 13 through a coupling. A premix 14 is provided in the plastic color mixer 1. The output shaft of the servo motor 12 passes through the bottom wall of the premix 14. A frustum 141 is fixed to the bottom wall of the premix 14. A second stirring rod 15 is also connected to the output shaft of the servo motor 12.

[0027] In the process of plastic color mixing, a premixing-final mixing two-stage process is adopted to ensure that the color powder can be evenly dispersed in the plastic raw material through a two-stage mixing process. In the premixing process, the color powder and a small amount of plastic raw material are initially mixed by low-speed stirring to form a "masterbatch prototype", which reduces the agglomeration of the color powder, shortens the main mixing time, and reduces energy consumption. In the premixing stage, the stirring speed of the second stirring rod 15 is controlled at 200-400RPM to reduce the scattering of the color powder.

[0028] After the premixing stage is over, the formed "masterbatch prototype" needs to be transferred to the final mixing equipment to avoid contamination and oxidation. Specifically, the bottom of the premix 14 is rotatably connected to a rotating member 16, and the bottom wall of the premix 14 and the rotating member 16 are both provided with evenly distributed arc-shaped discharge holes, and the rotating member 16 and the arc-shaped discharge holes on the premix 14 are staggered.

[0029] When the "masterbatch prototype" needs to be transferred to the plastic color mixer 1, the rotating member 16 only needs to be rotated 45° so that the arc-shaped discharge holes of the rotating member 16 and the premix 14 overlap with each other, and the "masterbatch prototype" in the premix 14 will fall into the plastic color mixer 1 through the discharge hole.

[0030] In order to enable the rotating member 16 to rotate when needed, specifically, a moving rack 17 is slidably connected to the plastic color mixer 1, and a gear is provided on the rotating member 16. The moving rack 17 meshes with the rotating member 16. When it is necessary to transfer the "masterbatch prototype" into the plastic color mixer 1, the moving rack 17 is pulled outwards. The moving rack 17 will drive the rotating member 16 to rotate, so that the arc-shaped discharge holes coincide for discharging materials.

[0031] During the premixing process, vibrations will occur when the device is running. The moving rack 17 may slide slightly, causing the rotating member 16 to rotate, resulting in the raw materials in the premixing member 14 being transferred into the plastic color mixer 1 before being fully mixed with the color powder, resulting in unqualified "masterbatch prototypes". Therefore, it is necessary to lock the moving rack 17. The plastic color mixer 1 is provided with a pin assembly near the outer end of the moving rack 17. On the one hand, the moving rack 17 will not slide when the device is running. On the other hand, when the moving rack 17 is pulled outwards, the distance that the moving rack 17 is pulled outwards can be controlled, so that the rotation angle of the rotating member 16 can be fixed.

[0032] Refer to the appendix Figure 4 Specifically: The pin assembly includes a buckle 18 slidably connected to the plastic color mixer 1. A first spring 19 is connected between the buckle 18 and the plastic color mixer 1. The first spring 19 is wound around the buckle 18. Two insertion holes are opened on the moving rack 17. When it is necessary to control the rotating member 16 to rotate and discharge materials, first pull the buckle 18 outwards so that it exits from the moving rack 17, and the first spring 19 is compressed. Secondly, pull the moving rack 17 outwards and release the buckle 18. When the insertion hole on the inner side of the moving rack 17 is aligned with the buckle 18, under the elastic force of the first spring 19, the buckle 18 will automatically slide into the moving rack 17 to lock it. Therefore, the distance that the moving rack 17 is pulled outwards is limited, so that the rotation angle of the rotating member 16 is fixed.

[0033] Refer to the appendix Figures 6-8 Refer to the appendix

[0034] During the plastic color mixing process, the pre-mixing capacity needs to match the capacity of the main color mixer. Usually, the proportion of the pre-mixing volume is 10%-15%. This range is to balance efficiency, equipment adaptability, and process stability. Therefore, the space between the pre-mixing part 14 and the plastic color mixer 1 is limited. In this embodiment, the displacement in the axial direction of the pre-mixing part 14 is used to control the displacement of the pushing part 29 in the radial direction of the pre-mixing part 14 to push the pushing part 29 to move. In order to make the inward movement distance of the pushing part 29 meet the requirements, a distance doubling component is provided on the pre-mixing part 14.

[0035] Refer to the appendix Figure 8 Specifically: The distance doubling component includes an elastic telescopic part 25 fixedly connected to the outer wall of the pre-mixing part 14 along the circumferential direction. The elastic telescopic part 25 is composed of two small square blocks, and the arrangement order of these small sections gradually becomes thinner from the inside to the outside. A second spring 26 is connected between the telescopic end of each elastic telescopic part 25 and the pre-mixing part 14. Along the longitudinal direction, a second wedge block 23 is fixedly connected to the telescopic end of the elastic telescopic part 25. Along the transverse direction, a first wedge block 22 is fixedly connected to the telescopic end of the elastic telescopic part 25. A gear 24 is rotatably connected to both the first wedge block 22 and the second wedge block 23. The outer wall of the pre-mixing part 14 is fixedly connected with first racks 27 evenly distributed along the circumferential direction. The gear 24 meshes with the adjacent first rack 27 and second rack 28.

[0036] When the first wedge block 22 and the second wedge block 23 move inward, the gear 24 also moves inward accordingly. The elastic telescopic part 25 will contract inward, and the second spring 26 is compressed. Since the gear 24 is located between the first rack 27 and the second rack 28 and meshes with them, the gear 24 will move inward while rotating, thereby driving the second rack 28 and the pushing part 29 to move inward. The inward moving pushing part 29 will push the internal material of the pre-mixing part 14 into the discharge hole.

[0037] In order to control the second wedge block 23 and the first wedge block 22 to be able to move inward, specifically, a multi-section electric push rod 2 of a power source is provided on the pre-mixing part 14. The telescopic end of the multi-section electric push rod 2 is fixedly connected with a pressing part 21. When the telescopic end of the multi-section electric push rod 2 extends downward, the pressing part 21 will move downward. Since there is only one contact point between the multi-section electric push rod 2 and the pressing part 21, when the pressing part 21 moves downward, it may be restricted from moving downward due to unbalanced force and cause tilting, resulting in limited downward movement of the pressing part 21. In order to enable the pressing part 21 to move smoothly in the vertical direction.

[0038] Refer to the appendix Figure 7, specifically, the pressing member 21 consists of an inner and an outer ring. The outer wall of the premixing member 14 is provided with chutes evenly distributed in the circumferential direction. The inner ring of the pressing member 21 slides between the evenly distributed chutes, and the outer ring of the pressing member 21 is in extrusion fit with both the first wedge block 22 and the second wedge block 23. When the multi-stage electric push rod 2 drives the pressing member 21 to move downward, the outer ring of the pressing member 21 will extrude the inclined surfaces of the first wedge block 22 and the second wedge block 23, causing the first wedge block 22 and the second wedge block 23 to drive the gear 24 to move inward while rotating, so as to push the pushing member 29 to push the material inward.

[0039] In order to achieve the maximum area coverage, when the circumferences of the four pushing members 29 are equal and the sum of the circumferences of the four portions of the pushing members 29 is equal to the circumference of the premixing member 14, if they move inward simultaneously, there will be spatial interference, resulting in collisions between components or the inability to complete the expected material pushing action. Therefore, by staggering the material pushing, such as in an alternating manner of first horizontal and then vertical, this problem can be effectively solved.

[0040] Refer to the appendix Figure 6 , specifically, the height of the first wedge block 22 is higher than that of the second wedge block 23. When the pressing member 21 moves downward, it will first contact the horizontal first wedge block 22, so that the horizontal pushing member 29 first pushes the material inward; as the pressing member 21 continues to move downward, the pressing member 21 will cross over the first wedge block 22. Under the action of the horizontal second spring 26, the first wedge block 22 will drive the gear 24 to move outward and reset, and the horizontal pushing member 29 will immediately reset. When the pressing member 21 moves downward and contacts the second wedge block 23, the pressing member 21 continues to extrude the second wedge block 23. Similarly, the vertical pushing member 29 moves inward to push the material. When the multi-stage electric push rod 2 drives the pressing member 21 to move upward and reset, the pressing member 21 contacts the first wedge block 22 again, causing the horizontal pushing member 29 to make another stroke.

[0041] Embodiment 2: The present invention adopts a two-stage process of premixing and final mixing. Through two-stage mixing process, it ensures that the toner can be evenly dispersed in the plastic raw material. The overall working process is as follows:

[0042] Premixing stage;

[0043] a: First, pour the toner and a small amount of plastic raw material into the premixing member 14, control the servo motor 12 to drive the second stirring rod 15 to stir at a low speed to obtain a "precursor of masterbatch". The second stirring rod 15 stops stirring, and pour the plastic raw material to be mixed with color into the plastic color mixer 1;

[0044] b: Then, pull the buckle 18 outwards to release the locking of the movable rack 17, pull the movable rack 17 outwards and release the buckle 18. When the movable rack 17 is locked by the buckle 18 again, the movable rack 17 drives the rotating member 16 to rotate 45°, so that the rotating member 16 coincides with the discharge hole of the premixing member 14, and the "masterbatch prototype" in the premixing member 14 will fall into the plastic color mixer 1;

[0045] c: Subsequently, control the multi-joint electric push rod 2 to drive the pressing member 21 to move downwards. The pressing member 21 will successively squeeze the first wedge block 22 and the second wedge block 23, so that the transverse and longitudinal pushing members 29 are staggered to push the material. The pushing member 29 will push the "masterbatch prototype" in the premixing member 14 into the plastic color mixer 1 to be mixed with the plastic raw material to be color-mixed;

[0046] Final mixing stage;

[0047] d: Continue to control the servo motor 12 to drive the first stirring rod 13 to rotate at a high speed, so that the "masterbatch prototype" is secondarily mixed with a large amount of plastic raw materials to ensure that the color powder can be evenly dispersed in the plastic raw materials;

[0048] e: Finally, discharge the evenly color-mixed plastic raw materials through the discharge pipe.

[0049] The above embodiments are only the preferred embodiments of the present invention, and are not used to limit the scope of implementation of the present invention. Therefore, all equivalent changes made according to the content described in the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A plastic recycling and color mixing device, characterized in that: The invention comprises a plastic color mixer (1), wherein the bottom wall of the plastic color mixer (1) is provided with a discharge pipe, the top of the plastic color mixer (1) is rotatably connected with a cover (11), a servo motor (12) is installed at the bottom of the plastic color mixer (1), the output shaft of the servo motor (12) is connected with a first stirring rod (13) via a coupling, a premixer (14) is provided inside the plastic color mixer (1), a truncated cone (141) is fixedly connected to the bottom wall of the premixer (14), and a second stirring rod (15) is also connected to the output shaft of the servo motor (12).

2. A plastic recycling and color mixing device according to claim 1, characterized in that: The bottom of the premixer (14) is rotatably connected to a rotating member (16), and the bottom wall of the premixer (14) and the rotating member (16) are both provided with uniformly distributed arc-shaped discharge holes, and the arc-shaped discharge holes on the rotating member (16) and the premixer (14) are staggered.

3. A plastic recycling and color mixing device according to claim 1, characterized in that: The plastic color mixer (1) is slidably connected with a movable rack (17), the rotating member (16) is provided with a gear (24), the movable rack (17) and the rotating member (16) are meshed with each other, and the plastic color mixer (1) is provided with a latch assembly near the outer end of the movable rack (17).

4. A plastic recycling and color mixing device according to claim 3, characterized in that: The latch assembly comprises a buckle (18) slidably connected to the plastic color mixer (1), a first spring (19) is connected between the buckle (18) and the plastic color mixer (1), the first spring (19) is wound around the buckle (18), and two insertion holes are formed on the movable rack (17).

5. A plastic recycling and color mixing device according to any one of claims 1 to 4, characterized in that: A plurality of arc-shaped push-in members (29) are slidably connected to the bottom wall of the premix (14) in the circumferential direction, a second rack (28) is fixedly connected to the outer side of the push-in member (29), and the second rack (28) slides on the outer wall of the premix (14). The premix (14) is provided with a double-distance component.

6. A plastic recycling and color mixing device according to claim 5, characterized in that: The double spacing assembly comprises an elastic telescopic member (25) fixedly connected to the outer wall of the premix (14) along the circumferential direction, a second spring (26) is connected between the telescopic end of each elastic telescopic member (25) and the premix (14), a second wedge block (23) is fixedly connected to the telescopic end of the elastic telescopic member (25) along the longitudinal direction, a first wedge block (22) is fixedly connected to the telescopic end of the elastic telescopic member (25) along the transverse direction, a gear (24) is rotatably connected to the first wedge block (22) and the second wedge block (23), the outer wall of the premix (14) is fixedly connected to first racks (27) evenly distributed along the circumferential direction, and the gear (24) is meshed with the adjacent first racks (27) and second racks (28).

7. A plastic recycling and color mixing device according to claim 6, characterized in that: The premixing element (14) is provided with a multi-section electric push rod (2) as a power source, and a downward pressing element (21) is fixedly connected to the telescopic end of the multi-section electric push rod (2).

8. A plastic recycling and color mixing device according to claim 7, characterized in that: The premixing member (14) is composed of two inner and outer rings. The outer wall of the premixing member (14) is provided with sliding grooves evenly distributed along the circumferential direction. The inner ring of the lower pressing member (21) slides between the evenly distributed sliding grooves. The outer ring of the lower pressing member (21) is squeezed and matched with the first wedge block (22) and the second wedge block (23).

9. The plastic recycling and color mixing device according to claim 5, characterized in that: The heights of the first wedge-shaped block (22) and the second wedge-shaped block (23) are arranged in steps.

Images