A stirring feeder device for a plastic extruder

Abstract

The utility model relates to the technical field of plastic processing equipment, especially to a kind of stirring feeding device for plastic extruder. Stirring feeding device includes stirring mechanism, vertical feeding mechanism and multiple storage mechanism. Multiple storage mechanism is set to the above of stirring mechanism and is all communicated with stirring mechanism. Vertical feeding mechanism is set to the side end of stirring mechanism and is communicated with stirring mechanism, and the below of vertical feeding mechanism can be communicated with plastic extruder. Stirring mechanism greatly improves the mixing uniformity of raw material, and provides quality stable raw material for subsequent extrusion molding. Real-time, dynamic, uniform mixing of each raw material before entering extruder is realized, frequent cleaning and shutdown waiting of external mixer are avoided, and color changing efficiency in multi-batch, small-batch production is significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing equipment technology, and in particular to a mixing and feeding device for a plastic extruder. Background Technology

[0002] In the plastic extrusion molding process, resin granules (such as PVC, PE, PP, etc.) are usually used as the base raw material. Depending on the product performance requirements, color masterbatches or additives are often added to the base resin. In traditional production processes, the above-mentioned raw materials and additives are usually premixed in a separate mixer before being fed into the extruder, and then the mixture is poured into the hopper for feeding.

[0003] However, this traditional process has several technical drawbacks. First, when switching between products with different color formulations, the mixing machine is prone to retaining material from the previous batch. If not thoroughly cleaned, this will contaminate subsequent products. To avoid contamination, the mixing machine must be stopped and thoroughly cleaned after each color change, significantly increasing non-production time, especially in small-batch, multi-color production scenarios, thus reducing production efficiency. Second, the uniformity of the premixing process is affected by mixing time, loading ratio, and equipment performance. Uneven mixing can lead to insufficient dispersion of masterbatch or additives in the material, resulting in color fluctuations and inconsistent performance during extrusion, affecting product quality stability. Furthermore, in some high-filler or high-viscosity formulations, gravity feeding is unstable, potentially causing insufficient or fluctuating feed to the extruder.

[0004] To address the aforementioned issues, some improvements have been proposed in existing technologies. For example, some equipment adds a separate masterbatch adding device at the extruder inlet, allowing for simple mixing with the main material within the hopper. However, this method results in a brief mixing process lacking forced stirring, relying primarily on the free diffusion of the material during its natural fall, leading to limited mixing uniformity. This is especially problematic between components with high addition ratios or significant density differences, where thorough dispersion is difficult to achieve. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a mixing and feeding device for a plastic extruder, which solves the technical problems of difficult color change and cleaning, poor mixing uniformity, insufficient feeding stability and low production flexibility in the traditional premixing process.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] This utility model provides a mixing and feeding device for a plastic extruder, comprising a mixing mechanism, a vertical feeding mechanism, and multiple storage mechanisms. The multiple storage mechanisms are located above the mixing mechanism and are all connected to it. The vertical feeding mechanism is located on the side of the mixing mechanism and is connected to it. The lower part of the vertical feeding mechanism can be connected to the plastic extruder. The multiple storage mechanisms are used to store different raw materials and to convey them into the mixing mechanism. The mixing mechanism is used to mix multiple raw materials and vertically convey the mixed materials to the plastic extruder via the vertical feeding mechanism.

[0010] Preferably, the stirring mechanism includes a stirring assembly, which includes a stirring chamber and a transverse stirring unit. The stirring chamber has an inlet and an outlet, and the transverse stirring unit is arranged transversely inside the stirring chamber for stirring and mixing multiple raw materials during rotation, and pushing the mixed raw materials toward the outlet during the rotation process.

[0011] Preferably, the transverse stirring unit includes a rotating shaft, multiple stirring elements, and multiple connecting rods; the rotating shaft is transversely arranged in the stirring chamber, the multiple connecting rods are fixedly arranged at intervals along the axial direction of the rotating shaft, two adjacent connecting rods are arranged perpendicular to each other, the multiple stirring elements are distributed along the axial direction of the rotating shaft, one end of each stirring element is connected to a connecting rod, and the other end is connected to another adjacent connecting rod.

[0012] Preferably, the stirring element is a spiral stirring blade; the spiral stirring blade includes an outer spiral blade and an inner spiral blade, the installation radius of the outer spiral blade is greater than the installation radius of the inner spiral blade, the blade width of the outer spiral blade is greater than the blade width of the inner spiral blade, the rotation direction of the outer spiral blade is configured to propel the raw material along the raw material conveying direction, and the rotation direction of the inner spiral blade is configured to push the raw material back against the raw material conveying direction.

[0013] Preferably, the stirring unit further includes multiple stirring rods; the multiple stirring rods are arranged laterally and fixed radially at intervals to the connecting rod near the discharge port; when the rotating shaft rotates, it drives the multiple stirring rods to rotate, which is used to disperse the mixed raw materials accumulated near the discharge port.

[0014] Preferably, the mixing mechanism further includes a feeding assembly for conveying the raw materials mixed by the mixing component to the vertical feeding mechanism; the feeding assembly includes a feeding pipe and two feeding screws; the top end of the feeding pipe is connected to the mixing component, and the side end is connected to the vertical feeding mechanism; the two feeding screws are rotatably disposed inside the feeding pipe, and their axes are parallel to each other and maintain a clearance fit.

[0015] Preferably, the vertical feeding mechanism includes a feeding pipe and a feeding screw; the feeding screw is rotatably disposed inside the feeding pipe, a mixture inlet is provided on the side wall of the feeding pipe, the mixture inlet is connected to the stirring mechanism, and a mixture outlet is provided at the bottom end of the feeding pipe, the mixture outlet is used to connect to a plastic extruder; the feeding screw rotates to transport the raw material entering through the mixture inlet vertically to the mixture outlet.

[0016] Preferably, it also includes a shutdown storage mechanism; the shutdown storage mechanism includes a shutdown storage hopper and a shutdown feeding assembly; the shutdown storage hopper is used to store clean material, the feed end of the shutdown feeding assembly is connected to the vertical feeding mechanism, and the discharge end is connected to the shutdown storage hopper, for discharging the mixed raw materials in the vertical feeding mechanism when the plastic extruder stops.

[0017] Preferably, the top of the shutdown storage silo is provided with a cleaning material inlet; the cleaning material inlet is used to feed the cleaning material, which can pass through the shutdown storage mechanism and the vertical feeding mechanism in sequence.

[0018] Preferably, it includes three storage mechanisms for storing powdered raw materials, color masterbatch raw materials, and crushed and recycled materials, respectively; the storage mechanism for storing powdered raw materials is equipped with a vertical stirring unit for stirring and dispersing the powdered raw materials.

[0019] (III) Beneficial Effects

[0020] The beneficial effects of this utility model are:

[0021] This invention relates to a mixing and feeding device for a plastic extruder. By incorporating multiple independent storage mechanisms, it can separately store and quantitatively deliver raw materials of different components, effectively avoiding errors in manual proportioning and uneven premixing. The mixing mechanism significantly improves the uniformity of the raw material mixing, providing stable raw materials for subsequent extrusion molding. It achieves real-time, dynamic, and uniform mixing of each raw material before it enters the extruder, avoiding frequent cleaning and downtime of external mixers, and significantly improving color-changing efficiency in multi-batch, small-volume production. Simultaneously, the controllable vertical feeding mechanism effectively overcomes problems such as bridging and uneven feeding that easily occur with highly filled, highly viscous, or poorly flowable materials during gravity feeding, ensuring a continuous and stable feeding rate and improving the process stability and product quality consistency of the extrusion process.

[0022] This utility model integrates mixing and feeding, has a compact structure, and responds quickly. It is particularly suitable for plastic extrusion production lines that require frequent formula changes or have high requirements for mixing accuracy. Attached Figure Description

[0023] Figure 1 This is a front view schematic diagram of a mixing and feeding device for a plastic extruder according to the present invention;

[0024] Figure 2 This is a side view schematic diagram of a mixing and feeding device for a plastic extruder according to the present invention;

[0025] Figure 3 This is a top view schematic diagram of a mixing and feeding device for a plastic extruder according to the present invention;

[0026] Figure 4 This is a cross-sectional schematic diagram of the mixing mechanism and the vertical feeding mechanism;

[0027] Figure 5 This is a schematic diagram of the structure of the horizontal stirring unit;

[0028] Figure 6 This is a partial cross-sectional view of the mixing mechanism, the vertical feeding mechanism, and the shutdown storage mechanism;

[0029] Figure 7 This is a cross-sectional schematic diagram of the material storage mechanism.

[0030] [Explanation of Labels in the Attached Image]

[0031] 1: Mixing mechanism; 11: Mixing assembly; 111: Mixing chamber; 112: Horizontal mixing unit; 1121: Rotating shaft; 1122: Spiral mixing blade; 1123: Connecting rod; 1124: Mixing rod; 1125: Mixing drive motor; 12: Feeding assembly; 121: Feeding pipe; 122: Feeding drive motor; 123: Feeding screw;

[0032] 2: Vertical feeding mechanism; 21: Feeding pipe; 22: Feeding screw; 23: Feeding drive motor;

[0033] 3: Storage mechanism; 31: Hopper assembly; 311: Vertical stirring unit; 3111: Stirring shaft; 3112: Stirring motor; 3113: Stirring paddle; 312: Powdered raw material hopper; 3121: Powdered raw material inlet; 3122: Exhaust port; 313: Masterbatch raw material hopper; 314: Crushed and recycled material hopper; 32: Conveying assembly; 321: Conveying pipe; 322: Conveying screw; 323: Conveying drive motor; 33: Weighing sensor;

[0034] 4: Stopped material storage mechanism; 41: Stopped material storage bin; 411: Cleaning material inlet; 42: Stopped feeding assembly; 421: Stopped feeding pipe; 422: Stopped feeding screw; 423: Stopped feeding drive motor;

[0035] 5: Support frame;

[0036] 6: Plastic extruder. Detailed Implementation

[0037] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0039] Example 1:

[0040] like Figure 1 and Figure 2 As shown, this embodiment provides a mixing and feeding device for a plastic extruder. The mixing and feeding device for the extruder includes a mixing mechanism 1, a vertical feeding mechanism 2, and multiple storage mechanisms 3. The multiple storage mechanisms 3 are located above the mixing mechanism 1 and are all connected to the mixing mechanism 1. The vertical feeding mechanism 2 is located on the side of the mixing mechanism 1 and is connected to the mixing mechanism 1. The lower part of the vertical feeding mechanism 2 can be connected to the plastic extruder 6. The multiple storage mechanisms 3 are used to store different raw materials and convey them into the mixing mechanism 1. The mixing mechanism 1 is used to mix multiple raw materials and vertically convey the mixed raw materials to the plastic extruder 6 via the vertical feeding mechanism 2. By setting multiple independent storage mechanisms 3, raw materials of different components can be stored and quantitatively conveyed separately, effectively avoiding the problems of manual proportioning errors and uneven premixing. The mixing mechanism 1 greatly improves the mixing uniformity of the raw materials, providing stable raw materials for subsequent extrusion molding. This invention achieves real-time, dynamic, and uniform mixing of all raw materials before they enter the extruder, avoiding frequent cleaning and downtime of external mixers and significantly improving color-changing efficiency in multi-batch, small-volume production. Simultaneously, the controllable vertical feeding mechanism 2 effectively overcomes problems such as bridging and uneven feeding that easily occur with highly filled, highly viscous, or poorly flowable materials during gravity feeding, ensuring a continuous and stable feeding rate and improving the process stability and product quality consistency of the extrusion process. This invention integrates mixing and feeding, featuring a compact structure and rapid response, making it particularly suitable for plastic extrusion production lines that require frequent formula changes or high mixing precision.

[0041] like Figure 4As shown, the mixing mechanism 1 includes a mixing assembly 11, which includes a mixing chamber 111 and a transverse mixing unit 112. The mixing chamber 111 has an inlet and an outlet. The transverse mixing unit 112 is transversely arranged inside the mixing chamber 111 and is used to mix various raw materials during rotation and push the mixed raw materials toward the outlet during the rotation process. The transverse mixing unit 112 replaces the traditional vertical mixing. When raw materials of different specific gravities, such as powder and granules, enter the transversely arranged mixing chamber 111, the rotational motion of the transverse mixing unit 112 breaks the vertical direction of the natural settling of the materials. The stratification trend caused by gravity settling is completely disrupted by the transverse shearing, convection and axial pushing action. This forces the powdery raw materials floating on the upper layer and the granular raw materials settling on the lower layer to be entangled, penetrated and dispersed, realizing deep and dynamic mixing throughout the entire conveying path. This ensures that the composition ratio of each batch of material output from the outlet is highly consistent, greatly improving the quality stability of the final extruded product.

[0042] Furthermore, the transverse stirring unit 112 includes a rotating shaft 1121, a stirring drive motor 1125, multiple stirring elements, and multiple connecting rods 1123. The rotating shaft 1121 is transversely arranged inside the stirring chamber 111, and one end is connected to the output shaft of the stirring drive motor 1125, which is fixed to the outer wall of the stirring chamber 111. Multiple connecting rods 1123 are fixedly spaced along the axial direction of the rotating shaft 1121, with adjacent connecting rods 1123 arranged perpendicularly to each other. Multiple stirring elements are distributed along the axial direction of the rotating shaft 1121, with one end of each stirring element connected to a connecting rod 1123 and the other end connected to an adjacent connecting rod 1123. The stirring drive motor 1125 drives the rotating shaft 1121 to rotate, thereby causing the connecting rods 1123 and stirring elements to rotate, so as to stir and mix multiple raw materials, and push the mixed raw materials axially to the discharge port through the rotation of the stirring elements.

[0043] Preferably, such as Figure 5As shown, the stirring element is a spiral stirring blade 1122. The spiral stirring blade 1122 includes an outer spiral blade and an inner spiral blade. The installation radius of the outer spiral blade is larger than that of the inner spiral blade, and the blade width of the outer spiral blade is also larger than that of the inner spiral blade. The outer spiral blade is configured to propel the material along the material conveying direction, while the inner spiral blade is configured to push the material back against the material conveying direction. Due to its larger installation radius and blade width, the outer spiral blade occupies the main area of ​​the mixing chamber's cross-section, thus providing a strong and dominant axial forward conveying force. This ensures that the material moves stably and continuously towards the discharge port, guaranteeing the overall conveying efficiency of the machine. Simultaneously, the inner spiral blade is configured for reverse conveying, continuously pushing the material back towards the inlet. This forward and reverse motion creates strong convection, shearing, and folding effects within the mixing chamber 111, greatly enhancing the dispersion and mixing degree of the material. Because the outer spiral blade dominates in conveying capacity and working area, the reverse action of the inner spiral blade does not hinder the overall forward movement of the material, thereby achieving ultra-high mixing quality while ensuring high conveying efficiency. At the same time, the powerful mechanical shearing force can effectively break up any material clumps or bridging that may form, ensuring the smooth feeding of powdery raw materials, especially those that are prone to moisture absorption or agglomeration, and improving the reliability of equipment operation.

[0044] Preferably, such as Figure 4 and Figure 5 As shown, the mixing unit 112 also includes multiple mixing rods 1124. The multiple mixing rods 1124 are all arranged laterally and fixed radially at intervals to the connecting rod 1123 near the discharge port. When the rotating shaft 1121 rotates, it drives the multiple mixing rods 1124 to rotate, thereby breaking up the mixed raw materials accumulated near the discharge port. The multiple mixing rods 1124 can prevent bridging and material accumulation near the discharge port, allowing the mixed raw materials to smoothly enter the next unit.

[0045] In one specific embodiment of this invention, the outer helical blades are positioned on a helix with a diameter of approximately 200 mm and a pitch of approximately 400 mm, while the inner helical blades are positioned on a helix with a diameter of approximately 125 mm and a pitch of approximately 250 mm. In this configuration, the outer helical blades provide the primary axial conveying capacity, while the inner helical blades are responsible for generating a reverse material backflow to enhance mixing. This embodiment has been tested to achieve a conveying capacity of approximately 1000 kg / h with good mixing performance.

[0046] like Figure 3 and Figure 6As shown, the mixing mechanism 1 also includes a feeding assembly 12 for conveying the raw materials mixed by the mixing component 11 to the vertical feeding mechanism 2. Specifically, the feeding assembly 12 includes a feeding pipe 121, a feeding drive motor 122, and two feeding screws 123. The top end of the feeding pipe 121 is connected to the outlet of the mixing component 11, and the side end is connected to the vertical feeding mechanism 2. The two feeding screws 123 are rotatably disposed inside the feeding pipe 121, and their axes are parallel to each other and maintain a clearance fit. One end of each of the two feeding screws 123 is connected to the output shaft of the feeding drive motor 122. The feeding drive motor 122 drives the two feeding screws 123 to rotate, thereby conveying the raw materials in the feeding pipe 121 to the vertical feeding mechanism 2. Two parallel, gap-fitted feeding screws 123 form a highly efficient volumetric conveying system. When the feeding drive motor 122 drives the twin screws to rotate synchronously, the meshing or synergistic action of the feeding screws 123 can form a continuous and stable material plug within the feeding tube 121, achieving forced material conveying. This effectively overcomes the problem of uneven material feeding caused by changes in material characteristics such as differences in flowability and slight agglomeration, ensuring a highly stable material flow from the mixing mechanism 1 to the vertical feeding mechanism 2. This lays a solid foundation for the stability of the entire extrusion process and the consistency of product quality.

[0047] like Figure 4 As shown, the vertical feeding mechanism 2 includes a feeding pipe 21, a feeding screw 22, and a feeding drive motor 23. The feeding screw 22 is rotatably disposed inside the feeding pipe 21, with one end connected to the output shaft of the feeding drive motor 23, which is fixed to the top of the feeding pipe 21. A mixture inlet is provided on the side wall of the feeding pipe 21, which is connected to the feeding pipe 121 of the mixing mechanism 1. A mixture outlet is provided at the bottom of the feeding pipe 21, which is used to connect to the plastic extruder 6. The feeding screw 22 rotates to convey the raw material entering through the mixture inlet vertically to the mixture outlet. The feeding screw 22 continuously pushes the raw material into the plastic extruder 6, avoiding occasional delays in screw feeding and raw material accumulation.

[0048] like Figure 1 , Figure 2 and Figure 7As shown, the system includes three storage mechanisms 3, used for storing powdered raw materials, masterbatch raw materials, and crushed recycled materials, respectively. Each storage mechanism 3 includes a connected hopper assembly 31 and a conveying assembly 32. The conveying assembly 32 includes a conveying pipe 321, a conveying screw 322, and a conveying drive motor 323. The top end of the conveying pipe 321 is connected to the bottom end of the hopper assembly 31, and the side end is connected to the stirring mechanism 1. The conveying screw 322 is rotatably disposed inside the conveying pipe 321, and one end is connected to the output shaft of the conveying drive motor 323.

[0049] Preferably, the conveying screw 322 is a twin screw with parallel axes and a clearance fit.

[0050] Preferably, the storage mechanism 3 further includes a weighing sensor 33. The weighing sensor 33 is fixedly installed at the bottom of the conveying assembly 32 and is used to weigh the raw materials in the hopper assembly 31 in real time. It should be noted that the weighing sensor 33 itself is a prior art component, and this application only innovatively integrates it into each storage mechanism 3 without improving the weighing sensor 33 itself.

[0051] Preferably, the storage mechanism 3 for storing powdered raw materials includes a powdered raw material hopper 312 and a vertical stirring unit 311 disposed therein. The vertical stirring unit 311 is used to stir and disperse the powdered raw materials. The powdered raw material hopper 312 has a powdered raw material inlet at the top and a powdered raw material outlet at the bottom, and the powdered raw material outlet is connected to a corresponding conveying pipe 321.

[0052] Specifically, such as Figure 7 As shown, the vertical stirring unit 311 includes a stirring shaft 3111, a stirring motor 3112, and multiple stirring paddles 3113. The stirring shaft 3111 is vertically arranged inside the powdered raw material silo 312, and one end is connected to the output end of the stirring motor 3112. The stirring motor 3112 is fixed to the top of the powdered raw material silo 312. Multiple stirring paddles 314 are fixed vertically at intervals on the stirring shaft 312. The stirring motor 3112 drives the stirring shaft 3111 to rotate, which in turn drives the stirring paddles 3113 to rotate, thereby breaking up the powdered raw material and allowing it to fall into the conveying pipe 321 through the powdered raw material outlet. This effectively solves the problem of poor discharge caused by the easy bridging and clumping of powdered raw materials. The stirring paddle 3113 rotates continuously or intermittently in the powdered raw material silo 312, mechanically agitating and crushing the powdered raw material. This directly and effectively breaks up the material arch that is about to form or has already formed, fundamentally ensuring the unobstructed supply line of the powdered raw material, ensuring the continuity of production, ensuring the stable and uniform supply of powdered raw material, and laying the foundation for precise proportioning.

[0053] The storage mechanism 3 for storing masterbatch raw materials includes a masterbatch raw material storage bin 313, and the storage mechanism 3 for storing crushed and recycled materials includes a crushed and recycled material storage bin 314.

[0054] Preferably, the powdered raw material silo 312, the color masterbatch raw material silo 313, and the crushed and recycled material silo 314 are all detachable.

[0055] In a preferred embodiment of the present invention, the volume of the powdered raw material silo 312 is greater than the volume of the crushed and recycled material silo 314, which is greater than the volume of the color masterbatch raw material silo 313.

[0056] like Figure 1 As shown, it also includes a shutdown storage mechanism 4. The shutdown storage mechanism 4 includes a shutdown storage hopper 41 and a shutdown feeding assembly 42. The shutdown storage hopper 41 is used to store clean material. The feed end of the shutdown feeding assembly 42 is connected to the vertical feeding mechanism 2, and the discharge end is connected to the shutdown storage hopper 41. It is used to push out the mixed raw material from the vertical feeding mechanism 2 when the plastic extruder stops. During the shutdown stage of the plastic extruder 6, the mixed raw material is pushed out to prevent the mixed raw material from decomposing and corroding the equipment inside.

[0057] Furthermore, the shutdown feeding assembly 42 includes a shutdown feeding pipe 421, a shutdown feeding screw 422, and a shutdown feeding drive motor 423. One end of the shutdown feeding pipe 421 is connected to the bottom of the shutdown storage hopper 41, and the other end is connected to the side wall of the feeding pipe 21. The shutdown feeding screw 422 is rotatably disposed inside the shutdown feeding pipe 42, and one end is connected to the output shaft of the shutdown feeding drive motor 423. When the plastic extruder 6 stops, the shutdown feeding drive motor 423 drives the shutdown feeding screw 422 to rotate, so as to transport the clean material in the shutdown storage hopper 41 to the feeding pipe 21 through the shutdown feeding pipe 421. Since the clean material is stable, it is used to push out the production raw material and stays in the feeding pipe 21 to prevent the raw material from decomposing in the extruder barrel and screw, which would damage the equipment.

[0058] Preferably, the stop-feed screw 422 is a twin screw with parallel axes and a clearance fit.

[0059] Preferably, such as Figure 3 As shown, a cleaning material inlet 411 is provided on the top of the shutdown storage silo 41. The cleaning material inlet 411 is used to feed cleaning material, which can pass through the shutdown storage mechanism 4 and the vertical feeding mechanism 2 in sequence.

[0060] like Figure 1 and Figure 2 As shown, it also includes a support frame 5. The support frame 5 is used to support and fix the mixing mechanism 1, the vertical feeding mechanism 2, the stopping material storage mechanism 4, and multiple material storage mechanisms 3.

[0061] Example 2

[0062] This embodiment is structurally the same as Embodiment 1, except that the mixing and feeding device also includes a control system, which includes a main controller. Each drive motor in this device is preferably a servo motor, and its electrical interface is connected to the main controller to transmit feedback signals representing the real-time rotational speed of the motor. Each weighing sensor 33 is also connected to the main controller to transmit the raw material weight change signals it detects to the main controller. Based on the weight change signals fed back by each weighing sensor 33, the actual feeding amount of each storage mechanism 3 is calculated; according to the preset formula, a target rotational speed control signal for the drive motor is generated to control the feeding amount; the real-time rotational speed signal fed back by the drive motor is received and compared with the total consumption calculated from the weighing signal; based on the comparison result, the control signal for the drive motor is dynamically adjusted to prevent material accumulation or shortage in the device, thereby achieving stable quantitative feeding. This utility model, by setting a loss-in-weight feeding control system, combines the precise rotational speed control of the servo motor with the real-time weight monitoring of the weighing sensor 33, forming a closed-loop control. This design achieves precise proportioning of various raw materials and high stability of total feed volume, effectively avoiding material accumulation or interruption caused by fluctuations in feeding, and significantly improving the quality consistency of the final product and the automation level of the production line.

[0063] It should be noted that the control system is existing technology known in the art. This application only applies its functions and does not improve its internal structure or control algorithm. Furthermore, the computer control process described in this application is an optional approach, not mandatory. Of course, in the absence of a control system, the speed of the drive motor and the feeding amount of each raw material can be preset.

[0064] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0065] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0066] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0067] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A mixing and feeding device for a plastic extruder, characterized in that, It includes a mixing mechanism (1), a vertical feeding mechanism (2), and multiple storage mechanisms (3); Multiple material storage mechanisms (3) are disposed above the stirring mechanism (1) and are all connected to the stirring mechanism (1). The vertical feeding mechanism (2) is disposed on the side of the stirring mechanism (1) and is connected to the stirring mechanism (1). The lower part of the vertical feeding mechanism (2) can be connected to the plastic extruder (6). Multiple storage mechanisms (3) are used to store different raw materials and to convey the raw materials into the mixing mechanism (1). The mixing mechanism (1) is used to mix multiple raw materials and to vertically convey the mixed raw materials to the plastic extruder (6) through the vertical feeding mechanism (2).

2. The mixing and feeding device for a plastic extruder as described in claim 1, characterized in that: The stirring mechanism (1) includes a stirring assembly (11), which includes a stirring chamber (111) and a horizontal stirring unit (112). The mixing chamber (111) is provided with an inlet and an outlet. The horizontal mixing unit (112) is horizontally arranged in the mixing chamber (111) for mixing and blending various raw materials during rotation, and pushing the mixed raw materials toward the outlet during the rotation process.

3. The mixing and feeding device for a plastic extruder as described in claim 2, characterized in that: The transverse stirring unit (112) includes a rotating shaft (1121), multiple stirring elements, and multiple connecting rods (1123); The rotating shaft (1121) is arranged laterally inside the mixing chamber (111). A plurality of connecting rods (1123) are fixedly arranged at intervals along the axial direction of the rotating shaft (1121). Two adjacent connecting rods (1123) are arranged perpendicular to each other. A plurality of stirring elements are distributed along the axial direction of the rotating shaft (1121). One end of each stirring element is connected to one of the connecting rods (1123), and the other end is connected to another adjacent connecting rod (1123).

4. The mixing and feeding device for a plastic extruder as described in claim 3, characterized in that: The stirring element is a spiral stirring blade (1122); The spiral stirring blade (1122) includes an outer spiral blade and an inner spiral blade. The installation radius of the outer spiral blade is greater than that of the inner spiral blade. The blade width of the outer spiral blade is greater than that of the inner spiral blade. The rotation direction of the outer spiral blade is configured to propel the raw material along the raw material conveying direction, and the rotation direction of the inner spiral blade is configured to push the raw material back against the raw material conveying direction.

5. The mixing and feeding device for a plastic extruder as described in claim 3, characterized in that: The stirring unit (112) also includes a plurality of stirring rods (1124); The plurality of stirring rods (1124) are arranged laterally and fixed radially at intervals to the connecting rod (1123) near the discharge port; When the rotating shaft (1121) rotates, it drives multiple stirring rods (1124) to rotate, which is used to break up the mixed raw materials piled up near the discharge port.

6. The mixing and feeding device for a plastic extruder as described in claim 2, characterized in that: The stirring mechanism (1) further includes a feeding component (12) for conveying the raw materials mixed by the stirring component (11) to the vertical feeding mechanism (2); The feeding assembly (12) includes a feeding tube (121) and two feeding screws (123); The top end of the feeding tube (121) is connected to the stirring assembly (11), and the side end is connected to the vertical feeding mechanism (2). The two feeding screws (123) are rotatably disposed inside the feeding tube (121), and their axes are parallel to each other and maintain a clearance fit.

7. The mixing and feeding device for a plastic extruder as described in claim 1, characterized in that: The vertical feeding mechanism (2) includes a feeding pipe (21) and a feeding screw (22); The feeding screw (22) is rotatably disposed inside the feeding pipe (21). A mixture inlet is provided on the side wall of the feeding pipe (21). The mixture inlet is connected to the stirring mechanism (1). A mixture outlet is provided at the bottom end of the feeding pipe (21). The mixture outlet is used to connect to the plastic extruder (6). The feed screw (22) rotates to transport the raw material entering the mixture inlet vertically to the mixture outlet.

8. The mixing and feeding device for a plastic extruder as described in claim 1, characterized in that: It also includes a shutdown material storage mechanism (4); The shutdown storage mechanism (4) includes a shutdown storage bin (41) and a shutdown feeding assembly (42); The shutdown storage hopper (41) is used to store the cleaned material. The feed end of the shutdown feeding assembly (42) is connected to the vertical feeding mechanism (2), and the discharge end is connected to the shutdown storage hopper (41). It is used to push out the mixed raw materials in the vertical feeding mechanism (2) when the plastic extruder stops.

9. The mixing and feeding device for a plastic extruder as described in claim 8, characterized in that: The top of the shutdown storage silo (41) is provided with a cleaning material inlet (411); The cleaning material inlet (411) is used to feed the cleaning material, which can pass through the shutdown storage mechanism (4) and the vertical feeding mechanism (2) in sequence.

10. The mixing and feeding device for a plastic extruder as described in claim 1, characterized in that: It includes three storage mechanisms (3) for storing powdered raw materials, masterbatch raw materials and crushed and recycled materials, respectively; The storage mechanism (3) for storing powdered raw materials is provided with a vertical stirring unit (311), which is used to stir and disperse the powdered raw materials.

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