Extruder for adding fiber material

Abstract

The utility model relates to the technical field of extruders, and discloses an extruder for adding fiber materials, which comprises a first hopper communicated with a feed port of an extruder body, and a premixing unit for premixing fibers and raw materials is arranged on the first hopper; a stirring assembly is arranged in the first hopper; the pre-mixing unit comprises a second hopper, a pre-stirring assembly is arranged in the second hopper, the pre-stirring assembly comprises a stirring rod, multiple groups of impellers are arranged on one side of the free end of the stirring rod, and the pre-mixing unit further comprises an airflow dispersion mechanism located over the impellers; through the arrangement of the premixing unit, under the combined action of the airflow dispersion mechanism and the rotary dispersion assembly, fiber materials are effectively dispersed, the aggregation state of the fiber materials is fundamentally destroyed, the fiber materials are prevented from falling down in a clustered mode, plastic raw materials enter fibers through the stirring effect, the isolation effect is achieved, and a uniformly-mixed premix is formed; therefore, the uniformity of the whole subsequent mixture is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of extruder technology, specifically relating to an extruder for adding fiber materials. Background Technology

[0002] Adding fibrous materials (such as glass fiber, carbon fiber, Kevlar fiber, natural fiber, etc.) to plastic products is a common material modification technique. Its main purpose is to improve the basic properties of plastics so that they can meet specific application requirements.

[0003] In response to this, during the production of plastic products, fiber materials are often pre-mixed with raw materials before being fed into an extruder. The advantages are convenient operation and simple steps; however, it also has the following drawbacks: on the one hand, due to the high aspect ratio of the fiber materials, they are extremely prone to entanglement, overlap, and hooking, forming fiber bundles or clumps; on the other hand, fiber materials generally have poor flowability, making it difficult to disperse them after mixing with raw materials, resulting in uneven mixing of fibers and raw materials, thus affecting the quality and performance of subsequent plastic products. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an extruder for adding fiber materials, so as to solve the technical problem of uneven mixing of fiber materials and plastic production raw materials in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An extruder for adding fiber materials includes a first hopper connected to the feed inlet of the extruder body, and a premixing unit for premixing fibers and raw materials on the first hopper; a stirring assembly is provided inside the first hopper; the premixing unit includes a second hopper connected to the first hopper, and a premixing assembly is provided inside the second hopper. The premixing assembly includes a stirring rod, and multiple sets of impellers are provided on one side of the free end of the stirring rod. The premixing unit also includes an airflow dispersion mechanism located directly above the impellers. The airflow dispersion mechanism includes an upward-opening air-gathering groove, and the air-gathering groove includes a bottom plate and an annular protrusion located on the periphery of the bottom plate. An annular airflow channel is opened inside the annular protrusion, and a blower is connected to the airflow channel. Multiple radial air outlets are opened at the bottom of the inner side of the annular protrusion, and a material discharge port is also opened at the center of the bottom plate.

[0007] Furthermore, each impeller group includes multiple blades, and the blade length of the blades in different impellers gradually increases from bottom to top;

[0008] Furthermore, the groove in the middle of the gas gathering groove forms a dispersion space, and the airflow channel and the dispersion space are connected through the air outlet;

[0009] Furthermore, a rotating dispersion component is also provided in the dispersion space. The rotating dispersion component includes a comb plate with the teeth facing vertically downwards. There is a gap between the comb plate and the bottom plate. The comb plate and the stirring rod are connected by a fixing rod.

[0010] Furthermore, a second cover plate for sealing is provided at the top opening of the second hopper. A fiber material inlet is opened near the center of the second cover plate. The fiber material inlet is directly opposite the dispersion space and is located outside the comb plate.

[0011] Furthermore, a blower is fixedly connected to the top surface of the second cover plate, and the blower is connected to the airflow channel through an air intake pipe;

[0012] Furthermore, the inner diameter of the material discharge port is larger than the diameter of the stirring rod;

[0013] Furthermore, a first cover plate for sealing is provided at the top opening of the first hopper, and the second hopper is connected to the first hopper through the premixed material inlet on the first cover plate. A sealing slot is opened on the side of the first cover plate near the premixed material inlet, the sealing slot covers the premixed material inlet, and a sealing insert plate is slidably connected in the sealing slot, so as to realize the opening and closing of the premixed material inlet through the sealing insert plate.

[0014] The beneficial effects of this utility model are as follows:

[0015] Compared with existing technologies, by setting up a premixing unit, the fiber material is effectively dispersed under the combined action of the airflow dispersion mechanism and the rotary dispersion component, which fundamentally destroys the aggregation state of the fiber material and prevents it from clumping together and falling. Furthermore, considering that the large stirring space and stirring components in the first hopper make it difficult to fully mix the fiber material with the plastic raw material, a more refined premixing component is set in the smaller second hopper to premix the fiber material with the plastic raw material. Through stirring, the plastic raw material enters between the fibers, playing a "separation" role and forming a uniformly mixed premix, thereby ensuring the uniformity of the entire mixture in the subsequent process. Attached Figure Description

[0016] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0017] Figure 1 This is an overall schematic diagram of the extruder used for adding fiber materials in Embodiment 1 of this utility model;

[0018] Figure 2 This is a cross-sectional view of the first hopper and premixing unit in Embodiment 1 of this utility model;

[0019] Figure 3 for Figure 2 Enlarged view at point A1;

[0020] Figure 4 for Figure 3 Enlarged view of section A2 in the middle.

[0021] The following labels are shown in the attached diagram:

[0022] The extruder body 1, first hopper 2, first cover plate 201, screw 202, first motor 203, first raw material inlet 204, premixed material inlet 205, premixing unit 3, second hopper 301, second cover plate 302, second raw material inlet 303, fiber material inlet 304, stirring rod 305, impeller 306, second motor 307, airflow dispersion mechanism 308, air gathering groove 309, bottom plate 3091, annular protrusion 3092, connecting rod 310, airflow channel 311, air outlet 312, blower 313, material discharge port 314, comb plate 315, fixing rod 316, sealing slot 317, sealing insert plate 318. Detailed Implementation

[0023] Example 1, specifically as follows: Figures 1-4 As shown.

[0024] An extruder for adding fiber materials includes an extruder body 1 and a first hopper 2 connected to the feed port of the extruder body 1. The first hopper 2 is provided with a premixing unit 3 for premixing fibers and raw materials.

[0025] like Figure 1 As shown, the first hopper 2 is shaped like an inverted frustum, with its inner diameter gradually decreasing from top to bottom. A first cover plate 201 for sealing is provided at the top opening of the first hopper 2, and the first cover plate 201 is connected to the first hopper 2 by screws. A first raw material inlet 204 is opened on the first cover plate 201, through which plastic raw materials enter the first hopper 2. A stirring assembly is provided at the center of the interior of the first hopper 2. In this embodiment, the stirring assembly includes a screw 202 extending vertically. The top end of the screw 202 passes through the first cover plate 201 and is rotatably connected to it. A first motor 203 is fixedly connected to the center of the top surface of the first cover plate 201. The screw 202 and the first motor 203 are connected by a coupling. The screw 202 includes helical blades located in the lower middle section of the shaft.

[0026] When in use, the screw 202 rotates under the drive of the first motor 203. On the one hand, it can stir and mix the mixture in the first hopper 2. On the other hand, it can also prevent the mixture from forming bridges in the first hopper 2, ensuring that the mixture can enter the extruder body 1 smoothly.

[0027] In the existing technology, plastic raw materials and fiber materials are usually added to the first hopper 2 at the same time to form a mixture. However, under the stirring action of the stirring component alone, it is difficult for the fiber material to be mixed evenly with the raw material, which leads to poor uniformity of the mixture and affects the quality of subsequent plastic products.

[0028] In this embodiment, a premixing unit 3 is provided at the top of the first hopper 2, such as... Figures 2-4 As shown, the premixing unit 3 includes a second hopper 301 disposed on the top surface of the first cover plate 201 and located on one side of the first motor 203. The second hopper 301 is connected to the first hopper 2 through a premixed material inlet 205 on the first cover plate 201. The second hopper 301 is also shaped like an inverted frustum, with its inner diameter gradually decreasing from top to bottom. A second cover plate 302 for sealing is provided at the top opening of the second hopper 301, and the second cover plate 302 is fixedly connected to the second hopper 301 by screws. A fiber material inlet 304 is opened near the center of the second cover plate 302, through which fiber material enters the second hopper 301. A second raw material inlet 303 is opened at the edge of the second cover plate 302, located outside the fiber material inlet 304, through which plastic raw material enters the second hopper 301.

[0029] The second hopper 301 is equipped with a pre-stirring assembly, which includes a vertical stirring rod 305. The axis of the stirring rod 305 coincides with the axis of the second hopper 301. The top end of the stirring rod 305 passes through the second cover plate 302 and is rotatably connected to the second cover plate 302. A second motor 307 is fixedly connected to the center of the top surface of the second cover plate 302. The stirring rod 305 and the second motor 307 are connected by a coupling. Multiple sets of impellers 306 are arranged at intervals along the vertical direction on one side of the free end of the stirring rod 305. In this embodiment, there are three sets of impellers 306. Each set of impellers 306 includes multiple blades welded to the outer side of the stirring rod 305 and evenly distributed along the circumference. It is worth emphasizing that the blade length of the blades in different impellers 306 gradually increases from bottom to top.

[0030] The premixing unit 3 also includes an airflow dispersion mechanism 308 disposed within the second hopper 301 and directly above the impeller 306. The airflow dispersion mechanism 308 includes an upward-facing air-gathering groove 309, which includes a circular base plate 3091 and an annular protrusion 3092 located around the base plate 3091. A groove in the center of the air-gathering groove 309 forms a dispersion space, and the fiber material inlet 304 is directly opposite the dispersion space. The air-gathering groove 309 and the second cover plate 302 are connected by multiple vertical connecting rods 310. Specifically, the bottom end of the connecting rod 310 is welded and fixed to the top surface of the annular protrusion 3092, and the top end of the connecting rod 310 is welded and fixed to the bottom surface of the second cover plate 302.

[0031] An annular protrusion 3092 has an annular airflow channel 311 inside. A blower 313 is fixedly connected to the top surface of the second cover plate 302. The blower 313 and the airflow channel 311 are connected through an air intake pipe. Specifically, the bottom end of the air intake pipe passes through the top surface of the annular protrusion 3092 and connects to the airflow channel 311, while the top end of the air intake pipe passes through the second cover plate 302 and connects to the blower 313. Multiple radial air outlets 312 are evenly spaced along the circumference at the bottom of the inner side of the annular protrusion 3092. The airflow channel 311 and the dispersion space are connected through the air outlets 312. A material discharge port 314 is also provided at the center of the bottom plate 3091, penetrating the bottom plate 3091. The inner diameter of the material discharge port 314 is larger than the diameter of the stirring rod 305.

[0032] The dispersion space is also equipped with a rotating dispersion component, such as... Figure 4 As shown, the rotating dispersion assembly includes a comb plate 315 with its teeth pointing vertically downwards. A gap exists between the comb plate 315 and the base plate 3091, and the fiber material inlet is located on the outside of the comb plate 315. In this embodiment, two comb plates 315 are symmetrically arranged about the stirring rod 305 as an axis of symmetry. The comb plate 315 and the stirring rod 305 are connected by an "L"-shaped fixing rod 316. Specifically, the horizontal section of the fixing rod 316 is perpendicular to the stirring rod 305 and the two are welded together. The vertical section of the fixing rod 316 is perpendicular to the top surface of the comb plate 315 and is welded together.

[0033] A sealing slot 317 is provided on the side of the first cover plate 201 near the premix inlet 205. The sealing slot 317 covers the premix inlet 205. A sealing insert plate 318 is slidably connected inside the sealing slot 317. The premix inlet 205 is opened and closed through the sealing insert plate 318.

[0034] In operation, firstly, a small portion of the plastic raw material is added to the second hopper 301 through the second raw material inlet 303. The second motor 307 and blower 313 are then turned on. Next, fiber material is added to the air-gathering tank 309 through the fiber material inlet 304. Airflow exits through the air outlet 312 and disperses the fiber material in the air-gathering tank 309. Simultaneously, the comb plate 315, rotating with the stirring rod 305, further disperses the fibers in the air-gathering tank 309. The dispersed fiber material falls through the discharge port 314 and, under the action of the pre-mixing component, is fully mixed with the plastic raw material in the second hopper 301. Finally, the fully mixed premix falls through the premix inlet 205 into the first hopper 2 and undergoes a final mixing with the plastic raw material in the first hopper 2.

[0035] By setting up the premixing unit 3, the fiber material is effectively dispersed under the combined action of the airflow dispersion mechanism 308 and the rotary dispersion component, which fundamentally destroys the aggregation state of the fiber material and prevents it from clumping together and falling. Furthermore, considering that the large stirring space and stirring components in the first hopper 2 make it difficult to fully mix the fiber material with the plastic raw material, a more refined premixing component is set in the smaller second hopper 301 to premix the fiber material with the plastic raw material. Through the stirring action, the plastic raw material enters between the fibers, playing a "separation" role and forming a uniformly mixed premix, thereby ensuring the uniformity of the entire mixture in the future.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. An extruder for adding fibrous materials, characterized in that, The device includes a first hopper connected to the feed inlet of the extruder body, and a premixing unit for premixing fibers and raw materials. A stirring assembly is located inside the first hopper. The premixing unit includes a second hopper connected to the first hopper, and a premixing assembly is located inside the second hopper. The premixing assembly includes a stirring rod, with multiple impellers on one side of the free end of the stirring rod. The premixing unit also includes an airflow dispersion mechanism located directly above the impellers. The airflow dispersion mechanism includes an upward-opening air-gathering groove, which includes a bottom plate and an annular protrusion on the periphery of the bottom plate. An annular airflow channel is opened inside the annular protrusion, and a blower is connected to the airflow channel. Multiple radial air outlets are opened at the bottom of the inner side of the annular protrusion, and a material discharge port is also opened at the center of the bottom plate.

2. The extruder for adding fiber materials according to claim 1, characterized in that, Each impeller group includes multiple blades, and the blade length of the blades in different impellers gradually increases from bottom to top.

3. The extruder for adding fiber materials according to claim 1, characterized in that, The groove in the middle of the gas gathering groove forms a dispersion space, and the airflow channel and the dispersion space are connected through the air outlet.

4. The extruder for adding fiber materials according to claim 3, characterized in that, The dispersion space is also equipped with a rotating dispersion component, which includes a comb plate with its teeth facing vertically downwards. There is a gap between the comb plate and the bottom plate, and the comb plate is connected to the stirring rod by a fixing rod.

5. The extruder for adding fiber materials according to claim 4, characterized in that, The top opening of the second hopper is equipped with a second cover plate for sealing. The fiber material inlet is located near the center of the second cover plate. The fiber material inlet is directly opposite the dispersion space and is located outside the comb plate.

6. The extruder for adding fiber materials according to claim 5, characterized in that, A blower is fixedly connected to the top surface of the second cover plate, and the blower is connected to the airflow channel through an air intake pipe.

7. The extruder for adding fiber materials according to claim 1, characterized in that, The inner diameter of the discharge port is larger than the diameter of the stirring rod.

8. The extruder for adding fiber materials according to claim 1, characterized in that, The top opening of the first hopper is provided with a first cover plate for sealing. The second hopper is connected to the first hopper through the premixed material inlet on the first cover plate. A sealing slot is opened on the side of the first cover plate near the premixed material inlet. The sealing slot covers the premixed material inlet. A sealing insert plate is slidably connected in the sealing slot. The premixed material inlet is opened and closed through the sealing insert plate.

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