A mixing device for plastic particle production

Abstract

The utility model provides a kind of mixing device for plastic particle production, including frame and the bearing platform being fixed on frame. Bearing platform is equipped with stirring barrel, and stirring barrel top is equipped with mixing box, and mixing box bottom is equipped with feed inlet communicated with stirring barrel. Mixing box top is equipped with first motor, and its driving end connects shaft rod, and scraper is installed in the section of mixing box in shaft rod, and spiral stirring paddle is installed in the section of stirring barrel. Frame top is equipped with hopper, and hopper is divided into several independent partitions by multiple partitions, and each partition is communicated with mixing box by independent feed pipe. First solenoid valve is equipped on the discharge pipe of stirring barrel bottom. When working, multiple raw materials are measured by hopper partition and then enter mixing box, and after preliminary mixing by scraper, they fall into stirring barrel, and then are lifted and stirred by spiral stirring paddle, to realize two-stage efficient mixing. The device is compact in structure, uniform in mixing, high in efficiency, and suitable for mixing process in plastic particle production.

Description

Technical Field

[0001] This utility model belongs to the technical field of plastic particle production equipment, specifically relating to a mixing device for plastic particle production. Background Technology

[0002] Plastic pellets are a common name for plastic granules. As a basic raw material for plastic products, they are usually stored and transported in semi-finished form and then further processed into finished products. Plastics are polymer materials, mainly derived from petrochemical products such as ethylene, propylene, vinyl chloride, and styrene. These monomers undergo polymerization reactions under specific conditions to form high molecular weight compounds.

[0003] In the production of plastic pellets, mixing is a crucial pretreatment step aimed at meeting the material proportioning requirements for subsequent molding. However, currently common mixing devices have relatively simple structures, typically only possessing basic feeding and stirring functions. Due to the lack of effective dispersion and homogenization mechanisms, the distribution of different raw materials after input is extremely uneven, resulting in a significant extension of mixing time. This not only severely impacts production efficiency but also makes it difficult to guarantee the consistency and quality of the final product.

[0004] Chinese utility model patent CN214082195U discloses a mixing device for plastic granule production, including a mixing tank and a drive mechanism. A sealed bearing is embedded in the center of the top surface of the mixing tank. One or more feed pipes are installed in the inner ring of the sealed bearing. The lower ends of the feed pipes extend into the mixing tank and are all bent outwards. Each feed pipe has one or more discharge holes on its bottom surface. The upper ends of the feed pipes are exposed to the outside and are equipped with inclined conveying pipes. A hopper is installed at the upper end of each conveying pipe. The feed pipes are driven by the drive mechanism. This utility model has a simple structure. Different materials can be added to different hoppers. After the motor and control valve are turned on, the feed pipes rotate, allowing the discharged material to rotate and repeatedly cover the material layer by layer, ensuring thorough pre-mixing of different materials and greatly reducing subsequent mixing time and increasing efficiency. However, the feed pipes and discharge holes are prone to clogging, affecting production progress. Utility Model Content

[0005] The purpose of this invention is to provide a mixing device for producing plastic granules, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a mixing device for producing plastic granules, comprising a frame, a support platform fixedly mounted on the frame, a mixing tank fixedly mounted on the support platform, a mixing box fixedly mounted on the top of the mixing tank, a feed inlet communicating with the mixing tank at the bottom of the mixing box, a first motor fixedly mounted on the top of the mixing box, a shaft fixedly mounted on the drive end of the first motor, a scraper fixedly mounted on the shaft and inside the mixing box, a spiral mixing blade fixedly mounted on the shaft and inside the mixing tank, a hopper fixedly mounted on the top of the frame, multiple partitions fixedly mounted on the hopper, the hopper communicating with the mixing box through multiple feed pipes, a discharge pipe fixedly mounted on the bottom of the mixing tank, and a first electromagnetic valve fixedly mounted on the discharge pipe.

[0007] Preferably, an external stirring frame is movably installed inside the stirring tank, and a second motor is fixedly installed at the bottom of the stirring tank. The drive end of the second motor is fixedly connected to the external stirring frame. The external stirring frame includes a bracket and a support rod, and multiple crossbars are fixedly installed on the support rod.

[0008] Preferably, a separator cylinder is fixedly installed inside the mixing tank and between the outer mixing frame and the spiral mixing blade.

[0009] Preferably, the bracket is provided with a fixed shaft, which is movably connected to the end of the shaft via a bearing.

[0010] Preferably, each of the multiple feed pipes is fixedly equipped with a second solenoid valve.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The hopper of this invention is divided into multiple independent sections by partitions, each section holding different types of materials to be mixed. Each section is connected to a mixing box via an independent feed pipe, allowing different materials to enter the mixing box separately. Driven by a first motor, a shaft drives a scraper to rotate within the mixing box, performing preliminary mixing of the various materials. Subsequently, the pre-mixed material falls into the mixing tank through the feed inlet. At this time, the first motor simultaneously drives a spiral agitator to rotate, lifting and stirring the material from bottom to top, thereby achieving a rapid and uniform mixing effect. By setting up a two-stage mixing process combining preliminary mixing and main stirring, the overall mixing time is effectively shortened, improving production efficiency and mixing quality. Attached Figure Description

[0013] Figure 1 This is the first perspective structural view of this utility model.

[0014] Figure 2 This is the second perspective structural view of this utility model.

[0015] Figure 3 This is an exploded structural view of the mixing box of this utility model.

[0016] Figure 4 This is an internal structural view of the mixing tank of this utility model.

[0017] Figure 5 This is a structural view of the stirring assembly of this utility model.

[0018] The diagram shows: 1. Frame; 2. Support platform; 3. Mixing tank; 4. Mixing box; 5. Feed inlet; 6. First motor; 7. Shaft; 8. Scraper; 9. Spiral mixer; 10. Hopper; 11. Partition plate; 12. Feed pipe; 13. Discharge pipe; 14. First solenoid valve; 15. Outer mixing frame; 16. Second motor; 17. Support bracket; 18. Support rod; 19. Crossbar; 20. Divider cylinder; 21. Fixed shaft; 22. Bearing; 23. Second solenoid valve. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1:

[0021] This utility model provides a mixing device for producing plastic granules, including a frame 1, a support platform 2 fixedly installed on the frame 1, a mixing tank 3 fixedly installed on the support platform 2, a mixing box 4 fixedly installed on the top of the mixing tank 3, a feed inlet 5 connected to the mixing tank 3 at the bottom of the mixing box 4, a first motor 6 fixedly installed on the top of the mixing box 4, a shaft 7 fixedly installed on the drive end of the first motor 6, a scraper 8 fixedly installed on the shaft 7 and inside the mixing box 4, and a spiral mixing paddle 9 fixedly installed on the shaft 7 and inside the mixing tank 3. A hopper 10 fixedly installed on the top of the frame 1, multiple partitions 11 fixedly installed on the hopper 10, and the hopper 10 connected to the mixing box 4 through multiple feed pipes 12. A discharge pipe 13 fixedly installed on the bottom of the mixing tank 3, and a first solenoid valve 14 fixedly installed on the discharge pipe 13. An external stirring frame 15 is movably installed inside the mixing tank 3. A second motor 16 is fixedly installed at the bottom of the mixing tank 3, and the drive end of the second motor 16 is fixedly connected to the external stirring frame 15. The external stirring frame 15 includes a bracket 17 and a support rod 18, and multiple crossbars 19 are fixedly installed on the support rod 18. A partition cylinder 20 is fixedly installed inside the mixing tank 3, located between the external stirring frame 15 and the spiral stirring paddle 9. The bracket 17 has a fixed shaft 21, which is movably connected to the end of the shaft 7 through a bearing 22. Multiple feed pipes 12 are all fixedly equipped with second solenoid valves 23.

[0022] Through the above technical solution, the hopper 10 of this utility model is divided into multiple independent sections by a partition 11, each section being used to accommodate different types of materials to be mixed. Each section is connected to the mixing box 4 through an independent feed pipe 12, allowing various materials to enter the mixing box 4 separately. Driven by the first motor 6, the shaft 7 drives the scraper 8 to rotate within the mixing box 4, performing preliminary mixing of the various materials. Subsequently, the pre-mixed materials fall into the mixing tank 3 through the feed inlet 5. At this time, the first motor 6 simultaneously drives the spiral stirring paddle 9 to rotate, lifting and stirring the materials from bottom to top, thereby achieving a rapid and uniform mixing effect. By setting up a two-stage mixing process combining preliminary mixing and main stirring, the overall mixing time is effectively shortened, and production efficiency and mixing quality are improved.

[0023] Example 2:

[0024] In this embodiment, a support platform 2 is fixedly installed on the frame 1, serving as the basic support structure for the entire device. A mixing tank 3 is fixedly installed on the support platform 2. A mixing box 4 is fixedly connected to the top of the mixing tank 3. The bottom of the mixing box 4 has a feed inlet 5 communicating with the interior of the mixing tank 3, ensuring that materials can flow smoothly from the mixing box 4 into the mixing tank 3. A first motor 6 is fixedly installed on the top of the mixing box 4, and the drive end of the first motor 6 is fixedly connected to a shaft 7, which passes through the mixing box 4 and the mixing tank 3. Inside the mixing box 4, a scraper 8 is fixedly installed on the shaft 7. As the scraper 8 rotates with the shaft 7, it performs preliminary mixing of the various materials entering the mixing box 4, preventing material accumulation and promoting dispersion. Inside the mixing tank 3, a spiral stirring paddle 9 is fixedly installed on the shaft 7. As the spiral stirring paddle 9 rotates, it lifts the material from the bottom upwards and stirs it, achieving an efficient and uniform mixing process. A hopper 10 is fixedly installed on the top of the frame 1. The interior of the hopper 10 is divided into multiple independent compartments by several partitions 11, each compartment being used to hold different types of plastic raw materials. The hopper 10 is connected to the mixing box 4 through multiple independent feed pipes 12, allowing different materials to enter the mixing box 4 separately, avoiding cross-contamination or blockage during the feeding process. A discharge pipe 13 is fixedly installed at the bottom of the mixing tank 3, and a first solenoid valve 14 is fixedly installed on the discharge pipe 13 to control the discharge of the mixed material, ensuring convenient operation and good sealing.

[0025] The device operates on a two-stage mixing mechanism. First, multiple raw materials are initially mixed within the mixing chamber 4 by the rotation of a scraper 8. The scraper 8 is designed to effectively remove material adhering to the inner wall of the mixing chamber 4, promoting uniform distribution and dispersion of the raw materials. The pre-mixed material then enters the mixing tank 3 through the feed inlet 5, where it undergoes primary mixing under the action of a spiral stirring paddle 9. The rotation of the spiral stirring paddle 9 not only circulates and lifts the material from the bottom upwards but also generates a strong shearing and mixing effect through its spiral structure, ensuring thorough integration of different raw materials. This combination of preliminary mixing and primary mixing significantly improves mixing efficiency, reduces overall mixing time, and avoids the uneven material distribution and clogging problems common in traditional devices, thereby improving the quality and consistency of plastic granule production. The entire device is compact, easy to operate, and suitable for mixing various plastic raw materials.

[0026] Example 3:

[0027] In this embodiment, an outer stirring frame 15 is movably installed inside the mixing tank 3. This outer stirring frame 15 is arranged outside the spiral stirring paddle 9, forming an internal and external mixing structure with the spiral stirring paddle 9. The outer stirring frame 15 is driven by a second motor 16 fixedly installed at the bottom of the mixing tank 3. The drive end of the second motor 16 is fixedly connected to the outer stirring frame 15, allowing the outer stirring frame 15 to rotate independently within the mixing tank 3. The outer stirring frame 15 includes a support 17 and a support rod 18. The support 17 has a ring structure, and the support rod 18 extends radially along the support 17 and is fixedly connected. Multiple crossbars 19 are fixedly installed on the support rod 18, and the crossbars 19 are evenly distributed along the length of the support rod 18, forming a multi-layered stirring element. When the spiral stirring paddle 9 rotates in the central area of ​​the mixing tank 3, it stirs the material from the bottom to the top. During the upward movement, the material is sheared and pushed by the spiral blades, achieving intense mixing in the central area. Subsequently, under the action of gravity, the material flows downward along the wall of the mixing tank 3, forming a circulating flow path. The outer stirring rack 15 rotates in the outer area of ​​the material flow, and its crossbar 19 intercepts, disperses, and stirs the downward-flowing material, breaking up material agglomeration and promoting the uniform distribution of different components. This coordinated internal and external stirring method enables the material to form a complete circulating mixing process within the mixing tank 3. The upward flow in the central area and the downward flow in the outer area work together to effectively shorten the overall mixing time and improve production efficiency and mixing quality.

[0028] In practical implementation, the support 17 of the outer stirring frame 15 maintains an appropriate gap with the inner wall of the mixing tank 3 to avoid interference with the tank wall and ensure smooth material flow. The arrangement angle and number of the support rods 18 and crossbars 19 are optimized to maximize the mixing effect. During rotation, the crossbars 19 cut and push the material, enhancing its radial and axial movement. The speed of the second motor 16 can be independently adjusted to adapt to the mixing requirements of different materials. For example, for high-viscosity plastic materials, a higher speed can be used to enhance shear force. The rotation direction of the outer stirring frame 15 and the spiral stirring paddle 9 can be set to be in the same direction or opposite directions as needed to generate different flow field characteristics and further optimize mixing efficiency. Through this structural design, the outer stirring frame 15 effectively compensates for the insufficient mixing of the spiral stirring paddle 9 in the tank wall area, achieving uniform mixing throughout the entire tank, avoiding the formation of local dead zones, and ensuring the consistency and quality of the final product.

[0029] Furthermore, the structural strength of the outer mixing frame 15 has been fully considered, enabling it to withstand various loads generated during the mixing process and ensuring long-term stable operation. The bracket 17, support rod 18, and crossbar 19 are integrally molded or reliably connected, ensuring overall rigidity and durability. In terms of installation and maintenance, the outer mixing frame 15 can be easily disassembled and replaced via the drive end of the second motor 16, reducing maintenance costs. During operation, the synergistic effect of the outer mixing frame 15 and the spiral agitator 9 not only improves mixing efficiency but also reduces energy consumption, meeting the energy-saving requirements of modern production. Through this innovative design, the mixing device for plastic granule production significantly improves production efficiency while ensuring mixing quality, meeting the needs of large-scale industrial production.

[0030] Example 4:

[0031] In this embodiment, a partition cylinder 20 is fixedly installed inside the mixing tank 3. This partition cylinder 20 is located between the outer stirring frame 15 and the spiral stirring paddle 9. The partition cylinder 20 has a cylindrical structure, with its upper and lower ends fixedly connected to the inner wall of the mixing tank 3, forming a stable installation. The spiral stirring paddle 9 is located inside the partition cylinder 20, while the outer stirring frame 15 is arranged on the outer side of the partition cylinder 20. The partition cylinder 20 divides the interior of the mixing tank 3 into two main areas: a central area and a peripheral area. During the mixing process, the spiral stirring paddle 9 rotates under the drive of the first motor 6, lifting the material from the bottom of the mixing tank 3 upwards, creating an upward flow within the central area. When the material reaches the upper part of the mixing tank 3, it is guided by the partition cylinder 20, flowing from the central area to both sides and entering the peripheral area. Within the peripheral area, the material flows downwards along the wall of the mixing tank 3, forming a circulation path.

[0032] Driven by the second motor 16, the outer stirring frame 15 rotates, and its support rods 18 and crossbars 19 agitate the downward-flowing material. The rotation direction of the outer stirring frame 15 is opposite to that of the spiral stirring paddle 9, enhancing the shearing and dispersing effect on the material. Guided by the partition cylinder 20, the material continuously rises from the center, diffuses to both sides, and then descends along the periphery, forming a continuous circulating flow. This flow pattern causes the material to repeatedly undergo rising and falling processes within the mixing tank 3, increasing the contact opportunities and mixing frequency between materials. The presence of the partition cylinder 20 avoids disordered mixing of materials between the central and peripheral areas, ensuring the stability and controllability of the flow path.

[0033] Guided by the separator 20, the material forms an orderly circulating flow within the mixing tank 3, improving mixing efficiency. During its ascent, the material is strongly agitated by the spiral agitator 9, and during its descent, it is further dispersed by the outer agitator 15, achieving multi-level and multi-directional mixing. This structural design effectively shortens mixing time and improves mixing uniformity, making it suitable for the production needs of various plastic particles. The entire device has a reasonable structure, is easy to operate, and can meet the process requirements of continuous production.

[0034] Example 5:

[0035] In this embodiment, the support 17 is equipped with a fixed shaft 21, which is movably connected to the end of the shaft 7 via a bearing 22, ensuring the stability of the shaft 7 during stirring. This embodiment is based on the aforementioned claims, wherein the mixing device includes a frame 1, a support platform 2, a mixing tank 3, a mixing box 4, a first motor 6, a shaft 7, a scraper 8, a spiral stirring paddle 9, a hopper 10, a partition 11, a feed pipe 12, a discharge pipe 13, and a first solenoid valve 14. The support 17, as part of the outer stirring frame 15, is installed inside the mixing tank 3 and is driven to rotate by a second motor 16. The outer stirring frame 15 includes the support 17 and a support rod 18. Multiple crossbars 19 are fixedly installed on the support rod 18 for stirring materials outside the spiral stirring paddle 9, promoting the downward flow of materials from the outside, thereby forming a cyclical mixing with the upward stirring of the spiral stirring paddle 9, effectively shortening the overall mixing time and improving production efficiency and mixing quality.

[0036] In the specific implementation of this embodiment, the fixed shaft 21 of the support 17 is designed as a cylindrical structure, and is movably connected to the end of the shaft 7 through a precision-machined bearing 22. The bearing 22 is a standard rolling bearing 22, with its inner ring tightly fitted to the end of the shaft 7, and its outer ring fixedly connected to the inner hole of the fixed shaft 21, ensuring that the shaft 7 can rotate freely at high speeds while reducing friction and vibration. The fixed shaft 21 is fixed to the support 17 by welding or bolts. The support 17, through the support rod 18 and crossbar 19, forms the overall frame of the outer stirring frame 15. Driven by the second motor 16, the outer stirring frame 15 rotates around the spiral stirring paddle 9, performing peripheral stirring of the materials. This connection method makes the rotation of the shaft 7 within the mixing box 4 and the stirring tank 3 more stable, avoiding uneven mixing or equipment wear caused by shaft 7 shaking, thereby improving the reliability and service life of the device.

[0037] A lubrication system is provided at the connection between the end of shaft 7 and the fixed shaft 21. By periodically adding lubricant, the bearing 22 is ensured to maintain good condition during long-term operation, preventing jamming or overheating due to insufficient lubrication. The fixed shaft 21 of the bracket 17 is made of high-strength steel and undergoes heat treatment to enhance its wear resistance and fatigue resistance, in order to meet the high load and continuous operation requirements during the mixing process of plastic particles. During the mixing process, the spiral agitator 9 lifts the material from the bottom of the mixing tank 3 upwards, forming strong agitation in the central area, while the outer agitator 15 rotates outside the spiral agitator 9, shearing and dispersing the material through the crossbar 19, causing the material to flow back downwards from the outside, forming a circulating flow. This combination of internal and external agitation, combined with the stable support of shaft 7, effectively improves the mixing uniformity and reduces material stratification and agglomeration.

[0038] Furthermore, the connection design between the fixed shaft 21 of the bracket 17 and the shaft 7 also considers ease of maintenance. The bearing 22 adopts a detachable structure, which is convenient for replacement or cleaning when needed, ensuring high efficiency during long-term operation of the device. During the mixing process, the materials are first initially mixed in the mixing box 4 by the scraper 8, and then enter the mixing tank 3 for main mixing. The fixed shaft 21 of the bracket 17 ensures the stable rotation of the shaft 7 throughout the two-stage mixing process, avoiding a decrease in mixing efficiency due to vibration or displacement. With this structure, the device can quickly achieve uniform mixing of various plastic raw materials, meeting the proportioning requirements of subsequent molding processes, and improving overall production efficiency and product quality consistency.

[0039] Example 6:

[0040] In this embodiment, a support platform 2 is fixedly installed on the frame 1, which supports the mixing tank 3. A mixing box 4 is fixedly connected to the top of the mixing tank 3. The bottom of the mixing box 4 is provided with a feed inlet 5 that communicates with the mixing tank 3. A first motor 6 is fixedly installed on the top of the mixing box 4. A shaft 7 is fixedly connected to the drive end of the first motor 6. A scraper 8 is fixedly installed inside the mixing box 4, and a spiral mixing paddle 9 is fixedly installed inside the mixing tank 3. A hopper 10 is fixedly installed on the top of the frame 1. The hopper 10 is divided into multiple independent partitions by multiple partitions 11 fixedly installed inside. Each partition is used to hold different types of plastic raw materials. The hopper 10 is connected to the mixing box 4 through multiple feed pipes 12. A second solenoid valve 23 is fixedly installed on each feed pipe 12. A discharge pipe 13 is fixedly installed at the bottom of the mixing tank 3. A first solenoid valve 14 is fixedly installed on the discharge pipe 13.

[0041] In this embodiment, a second solenoid valve 23 is installed on each feed pipe 12. By controlling the opening and closing degree of the second solenoid valve 23, the flow rate of material from the hopper 10 into the mixing box 4 can be precisely adjusted, thereby controlling the proportion between different materials. Specifically, when multiple plastic raw materials need to be mixed, the operator adjusts the opening degree of each second solenoid valve 23 according to the preset mixing ratio requirements. Valves with larger openings allow material to flow into the mixing box 4 at a faster speed, while valves with smaller openings slow down the material flow rate, thereby ensuring that various materials are added to the mixing box 4 synchronously or in stages according to the required proportions. This proportional control mechanism is based on the linear or nonlinear relationship between valve opening and material flow rate, and is implemented through an external control system such as a programmable logic controller or manual adjustment, avoiding the problem of uneven mixing caused by uneven feeding in traditional devices.

[0042] During the mixing process, as materials flow from the hopper 10 into the mixing box 4 through the feed pipe 12, the first motor 6 drives the shaft 7 to rotate, causing the scraper 8 to initially mix the various materials within the mixing box 4. The rotation of the scraper 8 disperses the materials and pushes them towards the feed inlet 5. The initially mixed materials then fall into the mixing tank 3 through the feed inlet 5. Simultaneously, the shaft 7 drives the spiral stirring paddle 9 to rotate within the mixing tank 3, lifting and stirring the materials from bottom to top to achieve deep mixing. Through the precise control of the second solenoid valve 23, the material ratio is optimized during the initial mixing stage, reducing subsequent stirring time and improving overall mixing efficiency and quality. After mixing is complete, the first solenoid valve 14 is opened, and the uniformly mixed plastic granules are discharged from the discharge pipe 13 for subsequent processing.

[0043] This embodiment enhances the accuracy and flexibility of material ratio control through the application of the second solenoid valve 23, solving the problems of uneven mixing and low efficiency caused by unstable feeding in traditional mixing devices. At the same time, combined with the two-stage mixing structure, it further improves the uniformity and consistency of plastic pellet production.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A mixing device for producing plastic granules, comprising a frame, wherein a support platform is fixedly mounted on the frame, characterized in that, A mixing tank is fixedly installed on the support platform. A mixing box is fixedly installed on the top of the mixing tank. The bottom of the mixing box has a feed inlet communicating with the mixing tank. A first motor is fixedly installed on the top of the mixing box. A shaft is fixedly installed on the drive end of the first motor. A scraper is fixedly installed on the shaft inside the mixing box. A spiral mixing blade is fixedly installed on the shaft inside the mixing tank. A hopper is fixedly installed on the top of the frame. Multiple partitions are fixedly installed on the hopper. The hopper is connected to the mixing box through multiple feed pipes. A discharge pipe is fixedly installed on the bottom of the mixing tank. A first solenoid valve is fixedly installed on the discharge pipe.

2. The mixing device for producing plastic granules according to claim 1, characterized in that, An external stirring frame is movably installed inside the stirring tank. A second motor is fixedly installed at the bottom of the stirring tank. The drive end of the second motor is fixedly connected to the external stirring frame. The external stirring frame includes a bracket and a support rod. Multiple crossbars are fixedly installed on the support rod.

3. The mixing device for producing plastic granules according to claim 2, characterized in that, A separator cylinder is fixedly installed inside the mixing tank and between the outer mixing frame and the spiral mixing blade.

4. The mixing device for producing plastic granules according to claim 2, characterized in that, The bracket is provided with a fixed shaft, which is movably connected to the end of the shaft via a bearing.

5. The mixing device for producing plastic granules according to claim 1, characterized in that, Each of the aforementioned feed pipes is fixedly equipped with a second solenoid valve.

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