Extruder feed mechanism

Abstract

The utility model discloses an extruder feeding mechanism belongs to extruder technical field, including premix bin and mixing bin, the top of premix bin is provided with a plurality of feed pipe, the mixing bin is set below premix bin and communicates with premix bin, and the bottom of mixing bin is provided with the blanking tube, the auxiliary shaft is rotatably installed on the feed pipe, and the bottom of auxiliary shaft is located in premix bin and is provided with the throwing unit, and a plurality of stirring rods are fixed on the main shaft in mixing bin. The premix bin of the utility model can preliminarily disperse and premix the material first, the material in premix bin from the feed pipe first falls on the throwing unit, and the material is thrown and scattered, and the materials of different properties (such as main material, auxiliary material, color mother and the like) are preliminarily mixed in the throwing and scattering, which avoids the problems of caking or uneven mixing possibly caused by one-time input.

Description

Technical Field

[0001] This utility model relates to the field of extruder technology, specifically to an extruder feeding mechanism. Background Technology

[0002] Extruders are core equipment in the field of polymer material processing, widely used in granulation, extrusion molding, and other processes in the plastics and rubber industries. The production quality and efficiency of an extruder largely depend on the uniformity of the raw material mixing. In actual production, multiple raw materials (such as main materials, auxiliary materials, color masterbatches, and additives) are often mixed in proportion before being fed into the extruder. Materials with different properties, especially those with significant differences in specific gravity and particle size, are prone to separation or aggregation when entering the extruder. This can lead to clumping, bridging, and uneven feeding, or even blockages, when fed in a single batch. Utility Model Content

[0003] To address the aforementioned technical deficiencies, the purpose of this utility model is to provide an extruder feeding mechanism that fully disperses and mixes the raw materials, ensuring that the material composition entering the extruder is uniform.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides an extruder feeding mechanism, comprising: A premixing chamber, the top of which is equipped with multiple feed pipes; A mixing chamber is located below and connected to the premixing chamber, and a discharge pipe is provided at the bottom of the mixing chamber; The premixing chamber has a main shaft rotatably mounted on its top, which runs through the premixing chamber and the mixing chamber. A secondary shaft is rotatably mounted on the feed pipe. The bottom of the secondary shaft is located inside the premixing chamber and is equipped with a scattering unit. Multiple stirring rods are fixed on the main shaft inside the mixing chamber. The bottom of the premixing chamber is equipped with a multi-stage elastic material structure.

[0005] Preferably, the scattering unit comprises: A connecting sleeve is disposed at the bottom of the sub-shaft and fixed by bolts; A receiving hopper, which is fixed to the bottom of a connecting sleeve, with the axis of the connecting sleeve coinciding with the axis of the receiving hopper; Multiple feeding plates are evenly fixed on the circumferential surface of the connecting sleeve and are fixedly connected to the inner side of the receiving hopper.

[0006] Preferably, the top of the feeding plate is provided with a slope, and the height of the slope gradually decreases from the end near the connecting sleeve to the end away from the connecting sleeve.

[0007] Preferably, a mixing motor connected to the main shaft is fixed to the top of the premixing chamber via a bracket, a first pulley is fixed on the main shaft between the premixing chamber and the mixing motor, a second pulley is fixed to the top of the secondary shaft, and a belt is wound between the first pulley and the second pulley.

[0008] Preferably, the diameter of the first pulley is larger than the diameter of the second pulley.

[0009] Preferably, the bottom of the premix bin is funnel-shaped, and the multi-stage elastic material structure includes multiple protruding rings fixed on the inner wall of the bottom of the premix bin.

[0010] Preferably, a guide plate is fixed on the main shaft at the top of the mixing chamber, and the guide plate has multiple steps from top to bottom.

[0011] Preferably, the distance between the multi-level steps on the guide plate and the inner wall of the mixing chamber gradually decreases from top to bottom.

[0012] Preferably, a feeding shaft is rotatably installed inside the feeding pipe, and a spiral conveying blade is fixed on the feeding shaft.

[0013] Preferably, the bottom of the feeding pipe is connected to an inclined guide pipe, and a feeding motor for driving the feeding shaft to rotate is provided on one side of the guide pipe.

[0014] The beneficial effects of this utility model are as follows: The premixing chamber designed in this utility model can first disperse and premix the materials. The materials entering the premixing chamber from the feed pipe first fall on the spreading unit and are scattered. Materials of different properties (such as main materials, auxiliary materials, color masterbatch, etc.) are initially mixed during the scattering, avoiding the problems of clumping or uneven mixing that may occur due to one-time input. After scattering, a part of the materials fall down the inner wall of the premixing chamber. The multi-stage elastic material structure makes the falling materials bounce, further promoting the dispersion of materials. The stirring rod in the mixing chamber continues to fully stir and mix the materials, and finally makes the materials uniformly mixed, so that the products extruded by the extruder have a uniform texture. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a perspective view of an extruder feeding mechanism provided for an embodiment of the present utility model.

[0017] Figure 2 This is a top view of an extruder feeding mechanism provided in an embodiment of the present utility model.

[0018] Figure 3 for Figure 2 Sectional view at point AA.

[0019] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0020] Figure 5 This is a perspective view of a feeding mechanism for an extruder provided in an embodiment of the present invention, showing a throwing disc.

[0021] Figure 6 This is a perspective view of a scattering unit in an extruder feeding mechanism provided in an embodiment of the present utility model.

[0022] Explanation of reference numerals in the attached figures: 1. Premix bin, 2. Feed pipe, 3. Mixing bin, 4. Discharge pipe, 5. Main shaft, 6. Secondary shaft, 7. Spreading unit, 71. Connecting sleeve, 72. Receiving hopper, 73. Feeding plate, 74. Inclined ramp, 8. Stirring rod, 9. Mixing motor, 10. First pulley, 11. Second pulley, 12. Belt, 13. Convex ring, 14. Guide plate, 15. Step, 16. Discharge shaft, 17. Spiral conveyor blade, 18. Guide pipe, 19. Discharge motor, 20. Discharge plate, 21. Discharge plate. Detailed Implementation

[0023] 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.

[0024] Example 1 like Figures 1 to 6 As shown, Embodiment 1 of this utility model provides an extruder feeding mechanism, including a premixing chamber 1 and a mixing chamber 3. Two feed pipes 2 are fixed to the top of the premixing chamber 1 for feeding materials of different types or properties, such as main materials, auxiliary materials, and color masterbatches. The mixing chamber 3 is located below the premixing chamber 1, and the two are connected through an opening at the bottom of the premixing chamber 1. A discharge pipe 4 is located at the bottom of the mixing chamber 3 for conveying the mixed material to the extruder.

[0025] A main shaft 5 is rotatably mounted on the top of the premixing chamber 1, vertically penetrating the premixing chamber 1 and extending into the mixing chamber 3. A secondary shaft 6 is rotatably mounted inside each feed pipe 2. The bottom of the secondary shaft 6 extends into the premixing chamber 1 and is equipped with a spreading unit 7, while its top extends out of the feed pipe 2. Multiple stirring rods 8 are fixedly mounted on the main shaft 5 inside the mixing chamber 3 for further mixing of the materials. The bottom of the premixing chamber 1 is designed with a funnel-shaped structure, and its inner wall has a multi-stage elastic material structure.

[0026] like Figure 6 As shown, the dispersing unit 7 includes a connecting sleeve 71, a receiving hopper 72, and multiple material-distributing plates 73. The connecting sleeve 71 is fitted onto the bottom of the sub-shaft 6 and fixedly connected to the sub-shaft 6 with bolts. The receiving hopper 72 is fixed below the connecting sleeve 71, and the axes of the two coincide. The receiving hopper 72 can be integrally formed with the connecting sleeve 71. The six material-distributing plates 73 are evenly distributed along the circumference of the connecting sleeve 71 and are fixedly connected to the inner wall of the receiving hopper 72 and the outer wall of the connecting sleeve 71. The top of the material-distributing plates 73 has a ramp 74 structure, which gradually decreases in height from the side closer to the connecting sleeve 71 to the side farther away from the connecting sleeve 71. When the sub-shaft 6 drives the material-distributing plates 73 to rotate at high speed, the material is struck by the material-distributing plates 73, and the material falling on the ramp 74 is thrown towards the inner wall of the premixing bin 1 along the tangential direction of the ramp. Some of the material falling into the receiving hopper 72 is thrown out under the action of centrifugal force. High-speed projection can break up small-area clumps of material, making the material more dispersed.

[0027] A throwing disc 20 is fixed on the main shaft 5 below the throwing unit 7. Multiple throwing plates 21 are fixed on the throwing disc 20. The size of the throwing disc 20 is larger than that of the receiving hopper 72. After the material is processed by the throwing unit 7, part of it is scattered again by the impact of the throwing disc 20, which increases the degree of material dispersion.

[0028] A mixing motor 9 is fixedly mounted on the top of the premixing chamber 1 via a bracket, and this motor is connected to the main shaft 5. A first pulley 10 is fixedly mounted on the section of the main shaft 5 located between the premixing chamber 1 and the mixing motor 9. A second pulley 11 is fixedly mounted on the top of each secondary shaft 6. The first pulley 10 and each of the second pulleys 11 are connected by a belt 12 for transmission. The diameter of the first pulley 10 is larger than the diameter of the second pulley 11, which makes the rotational speed of the main shaft 5 lower than that of the secondary shaft 6. When the stirring rod 8 stirs the material at a low speed, the scattering unit 7 can maintain a higher rotational speed to achieve different speed ratios and improve the scattering effect.

[0029] The multi-stage elastic material structure at the bottom of the premixing bin 1 includes multiple protruding rings 13 fixed on the funnel-shaped inner wall. When the material falls along the inner wall of the premixing bin 1, it is blocked and collided by the protruding rings 13. The protruding rings 13 can cause the falling material to bounce, further breaking up any material that may clump together, and at the same time increasing the degree of material dispersion.

[0030] During operation, materials are fed into the feed pipes 2 and fall onto the rotating spreading unit 7. The material-dispersing plate 73 disperses the materials while rotating at high speed, achieving initial mixing. Part of the dispersed material falls directly down, while the other part slides down the wall of the premixing chamber 1 and passes through a multi-stage elastic material structure, generating a bounce that enhances the dispersion effect. The material then enters the mixing chamber 3, where the main shaft 5 drives the stirring rod 8 to fully mix it, and finally discharges it through the discharge pipe 4.

[0031] Example 2 Based on Embodiment 1, this invention further includes a guide plate 14 fixedly installed at the top of the mixing chamber 3, above the main shaft 5. This guide plate 14 has a multi-stage stepped structure 15, distributed from top to bottom, with the distance between the steps 15 and the inner wall of the mixing chamber 3 gradually decreasing. This structure guides the material to fall step by step, extending the mixing path and enhancing mixing uniformity. When the material falls along the steps 15, it collides with the steps, causing a slight bounce.

[0032] During operation, the material initially mixed in the premixing bin 1 falls onto the guide plate 14, flows step by step along the steps 15 and is stirred by the stirring rod 8 to achieve more thorough mixing before being discharged from the discharge pipe 4.

[0033] Example 3 This embodiment improves upon either Embodiment 1 or Embodiment 2 by modifying the material feeding section.

[0034] A feeding shaft 16 is rotatably mounted inside the feeding pipe 4, and a spiral conveying blade 17 is fixed on the feeding shaft 16. An inclined guide pipe 18 is connected to the bottom of the feeding pipe 4, which facilitates the guidance of material to the extruder's feed inlet. A feeding motor 19 is also provided on one side of the guide pipe 18 to drive the feeding shaft 16 to rotate, thereby controlling the material discharge speed and quantity.

[0035] The above structure enables quantitative and controllable feeding, avoiding blockages or uneven discharge, and further improving the quality stability of extruded products.

[0036] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A feeding mechanism for an extruder, characterized in that, include: A premixing chamber, the top of which is equipped with multiple feed pipes; A mixing chamber is located below and connected to the premixing chamber, and a discharge pipe is provided at the bottom of the mixing chamber; The premixing chamber has a main shaft rotatably mounted on its top, which runs through the premixing chamber and the mixing chamber. A secondary shaft is rotatably mounted on the feed pipe. The bottom of the secondary shaft is located inside the premixing chamber and is equipped with a scattering unit. Multiple stirring rods are fixed on the main shaft inside the mixing chamber. The bottom of the premixing chamber is equipped with a multi-stage elastic material structure.

2. The extruder feeding mechanism as described in claim 1, characterized in that, The scattering unit includes: A connecting sleeve is disposed at the bottom of the sub-shaft and fixed by bolts; A receiving hopper, which is fixed to the bottom of a connecting sleeve, with the axis of the connecting sleeve coinciding with the axis of the receiving hopper; Multiple feeding plates are evenly fixed on the circumferential surface of the connecting sleeve and are fixedly connected to the inner side of the receiving hopper.

3. The extruder feeding mechanism as described in claim 2, characterized in that, The top of the feeding plate is provided with a slope, and the height of the slope gradually decreases from the end closer to the connecting sleeve to the end farther away from the connecting sleeve.

4. The extruder feeding mechanism as described in claim 1, characterized in that, The top of the premixing chamber is fixed with a mixing motor connected to the main shaft via a bracket. A first pulley is fixed on the main shaft between the premixing chamber and the mixing motor. A second pulley is fixed on the top of the secondary shaft. A belt is wound between the first pulley and the second pulley.

5. The extruder feeding mechanism as described in claim 4, characterized in that, The diameter of the first pulley is larger than the diameter of the second pulley.

6. The extruder feeding mechanism as described in claim 1, characterized in that, The bottom of the premix bin is funnel-shaped, and the multi-stage material structure includes multiple protruding rings fixed on the inner wall of the bottom of the premix bin.

7. The extruder feeding mechanism as described in claim 1, characterized in that, A guide plate is fixed on the main shaft at the top of the mixing chamber, and the guide plate has multiple steps from top to bottom.

8. The extruder feeding mechanism as described in claim 7, characterized in that, The distance between the multi-level steps on the feed tray and the inner wall of the mixing chamber gradually decreases from top to bottom.

9. The extruder feeding mechanism as described in claim 1, characterized in that, A feeding shaft is rotatably installed inside the feeding pipe, and a spiral conveying blade is fixed on the feeding shaft.

10. The extruder feeding mechanism as described in claim 9, characterized in that, The bottom of the feeding pipe is connected to an inclined guide pipe, and a feeding motor for driving the feeding shaft to rotate is provided on one side of the guide pipe.

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