Melting-increasing mixing filtering nozzle

Abstract

The invention relates to a melting-increasing mixing filtering nozzle which comprises a filter element with a hollow flow channel at the axis, the tail end of the filter element is closed, the filter element is sequentially provided with a flow dividing part, a mixing filtering part and an installation part from the tail end to the front end in the axial direction, the outer diameter of the installation part and the outer diameter of the flow dividing part are the same as the inner diameter of a first material conveying channel, and the inner diameter of the mixing filtering part is the same as the inner diameter of a second material conveying channel. The outer diameter of the mixing and filtering part is smaller than the inner diameter of the first material conveying channel, the side wall of the mixing and filtering part is provided with first flow channels and second flow channels which are sequentially and alternately arranged, the second flow channels are provided with filtering holes, the filtering holes are communicated with the hollow flow channels of the filter element, and the side wall of the flow dividing part is provided with a plurality of flow guide grooves. And each flow guide groove is communicated with the tail end of the first flow channel. Through the arrangement of the filter element, the three functions of melting increasing, mixing and filtering are achieved at the same time, and the product quality is ensured.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment technology, and specifically to a melt-enhancing compounding filter nozzle. Background Technology

[0002] In the injection molding industry, the use of recycled materials is common to reduce costs. This involves secondary or multiple crushing of extruded waste materials, mixing them with virgin materials, and remelting and extruding. During the recycling process, defective parts and sprues often introduce metallic foreign objects into the screw feed tube during crushing. Even with magnets at the hopper, small metallic objects such as copper, stainless steel, aluminum, and other alloy blades cannot be attracted. These small objects are trapped inside the product through the nozzle and mold runner, leading to defects. Secondly, metallic foreign objects larger than the nozzle orifice and mold inlet can clog the channels. Even a single blockage can disrupt production, requiring nozzle or mold disassembly for repair, causing significant disruption and unnecessary economic losses. Thirdly, the mixing of virgin and recycled materials can result in uneven mixing and incomplete melting, also affecting the quality of the final product. Summary of the Invention

[0003] The purpose of this invention is to overcome the defects of the prior art and provide a melt-enhancing compounding filter nozzle.

[0004] To achieve the objectives of this invention, the following technical solutions are provided in this application.

[0005] In a first aspect, this application provides a melt-enhancing compounding filter nozzle, the nozzle comprising a flange connector and a sub-nozzle mounted at the front end of the flange connector. The flange connector and the sub-nozzle are respectively provided with a first and a second conveying channel that pass through each other at their axial centers. The nozzle includes a filter element with a hollow flow channel at its axial center. The tail end of the filter element is closed. Along the axial direction from the tail end to the front end, the filter element is provided with a flow divider, a compounding filter, and a mounting portion in sequence. The outer diameter of the mounting portion and the flow divider is the same as the inner diameter of the first conveying channel. The outer diameter of the compounding filter is smaller than the inner diameter of the first conveying channel. The sidewall of the compounding filter is provided with alternating first and second flow channels. The second flow channel is provided with filter holes that connect to the hollow flow channel of the filter element. The sidewall of the flow divider is provided with multiple guide grooves, and each guide groove connects to the tail end of the first flow channel. The material enters the first flow channel from the guide channel and, as it flows forward in the first flow channel, continuously tumbles over it to enter the second flow channel. Within the second flow channel, it flows through the filter holes into the hollow flow channel of the filter element, and finally flows into the second feeding channel where it is extruded. During this process, as the material tumbles over the first flow channel into the second flow channel, it is simultaneously divided and thinned and compacted, achieving a melting-enhancing effect and allowing larger particles to melt more thoroughly. Simultaneously, as the material passes through the filter holes, impurities are filtered out. Furthermore, as the material passes through the filter holes and converges and cross-blends in the hollow flow channel, the mixing becomes more uniform, achieving a kneading effect. Therefore, this application, through the design of a single filter element, simultaneously achieves three major functions: melting enhancement, kneading, and filtration, ensuring product quality. The fact that the outer diameter of the mounting section and the flow-dividing section are the same as the inner diameter of the first feeding channel, as mentioned in this application, refers to a 1-5 μm gap between them. This gap ensures that the filter element can move within the first feeding channel without material leakage.

[0006] In one embodiment of the first aspect, a separation zone is provided between the first flow channel and the second flow channel, and the distance between the outer wall of the separation zone and the inner wall of the first conveying channel is 0.1~1mm. If this distance is too small, the material cannot cross the separation zone in time to enter the second flow channel, causing the material to accumulate in the first flow channel. Prolonged residence time will cause the material to turn yellow or black. However, if the distance is too large, the extrusion pressure on the material when crossing the separation zone will be small, resulting in a poor melting effect.

[0007] In one embodiment of the first aspect, each of the second flow channels is provided with 50 to 500 filter holes.

[0008] In one embodiment of the first aspect, the pore size of the filter holes is 0.5~2mm. The number and size of the filter holes are set to ensure that the material can pass through the filter holes and enter the hollow flow channel in a timely manner, preventing the material from staying in the second flow channel for too long and turning yellow or black. However, the pore size cannot be too large, because a large pore size will not provide a good filtering effect, and the mixing effect will be greatly reduced.

[0009] In one embodiment of the first aspect, the length-to-diameter ratio of the mixing and filtering section is 3 to 5:1. This application aims to ensure that the mixing and filtering section has a relatively long axial length to guarantee sufficient time for melting, filtering, and mixing.

[0010] In one embodiment of the first aspect, the depth of the first flow channel and the second flow channel is 2~5mm.

[0011] In one embodiment of the first aspect, the number of first and second channels in the mixing and filtering section is 4 to 10.

[0012] In one embodiment of the first aspect, the diversion section is tapered, wider at the front and narrower at the back. This design facilitates the diversion of material, allowing it to flow through the guide channel into the first flow channel without material stagnation and deterioration.

[0013] In one embodiment of the first aspect, the front end of the hollow flow channel is in communication with the second fluid channel.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By setting the first and second flow channels, this application can make the material divert and thin it when it is turned over, which can achieve the effect of increasing melting and make the large particles of material melt more thoroughly again.

[0015] (2) By setting a large number of filter holes, impurities can be filtered out on the one hand, and materials can be mixed on the other hand to improve product quality.

[0016] (3) The entire filter element is easy to replace. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this application.

[0018] Figure 2 This is a structural schematic diagram of a flange connection.

[0019] Figure 3 This is a schematic diagram of the overall structure of the filter element.

[0020] Figure 4 This is the front view of the filter element.

[0021] Figure 5 This is a schematic diagram of the sub-injector nozzle.

[0022] In the attached drawings, 1 is the flange connection body, 2 is the sub-nozzle, 3 is the filter element, 4 is the first material conveying channel, 5 is the heating jacket, 6 is the external thread, 7 is the diversion section, 8 is the mixing and filtering section, 9 is the mounting section, 10 is the hollow flow channel, 11 is the first flow channel, 12 is the second flow channel, 13 is the filter hole, 14 is the isolation strip, 15 is the guide groove, 16 is the second material conveying channel, 17 is the internal thread, and 18 is the mounting cavity. Detailed Implementation

[0023] Unless otherwise defined, the technical or scientific terms used in this specification and claims shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. All values ​​listed herein, ranging from the minimum to the maximum, refer to all values ​​obtained by incrementing the minimum and maximum values ​​by one unit when the difference between the minimum and maximum values ​​is more than two units.

[0024] The following describes specific embodiments of the present invention. It should be noted that, in order to provide a concise description, this specification cannot provide a detailed description of all features of the actual embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can modify and substitute the embodiments of the present invention, and the resulting embodiments are also within the protection scope of the present invention. Example

[0025] The embodiments of the present invention will be described in detail below. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the scope of protection of the present invention is not limited to the following embodiments. Example 1

[0026] A melt-enhancing compounding filter nozzle, the structure of which is as follows: Figure 1 As shown, it includes a flange connector 1, a sub-nozzle 2 installed at the front end of the flange connector 1, and a filter element 3 installed at the axis of both. Details are as follows.

[0027] The structure of flange connector 1 is as follows Figure 2 As shown, a first material conveying channel 4 runs through the front and rear of the flange connector 1, and an external thread 6 is provided on the outer wall of the front end of the flange connector 1. In addition, a heating jacket 5 is provided on the outer side of the flange connector 1.

[0028] The structure of the sub-jet nozzle 2 is as follows Figure 5As shown, the sub-nozzle 2 is also front-through, and from back to front, it is divided into an installation cavity 18, a first material conveying channel 4, and a second material conveying channel 16. The inner wall of the installation cavity 18 is provided with an internal thread 17, so that the sub-nozzle 2 is fixedly installed at the front end of the flange connector 1. The first material conveying channel 4 of the sub-nozzle 2 is connected to the first material conveying channel 4 of the flange connector 1, and their inner diameters are exactly the same.

[0029] The structure of filter element 3 is as follows Figure 3 , Figure 4 As shown, the filter element 3 comprises, from rear to front, a diversion section 7, a mixing and filtering section 8, and an installation section 9. A hollow flow channel 10 is located at the center of the filter element 3, and the tail end of the hollow flow channel 10 is closed. The front end of the diversion section 7 is conical, and the rear end is cylindrical, with the outer diameter of the cylindrical portion being the same as the inner diameter of the first conveying channel 4. The installation section 9 is cylindrical, and its outer diameter is the same as the inner diameter of the first conveying channel 4. When the filter element 3 is installed in the first conveying channel 4, the front end face of the installation section 9 abuts against the interface between the first conveying channel 4 and the second conveying channel 16, and the tail end face of the cylindrical portion of the diversion section 7 abuts against the tail end face of the first conveying channel 4, meaning the filter element 3 is precisely positioned within the first conveying channel 4. The side wall of the mixing and filtering section 8 has alternating first and second flow channels 11 and 12, respectively. The second flow channel 12 has filter holes 13 that connect to the hollow flow channel 10. The sidewall of the diversion section 7 is provided with multiple guide grooves 15, and each guide groove 15 is connected to the tail end of the first flow channel 11. An isolation strip 14 is provided between the first flow channel 11 and the second flow channel 12, and a gap of 0.1~1mm is left between the isolation strip 14 and the inner wall of the first conveying channel 4. The hollow flow channel 10 is connected to the second conveying channel 16, and the inner diameter of the hollow flow channel 10 is the same as the inner diameter of the second conveying channel 16.

[0030] The working principle of this melt-enhancing compounding filter nozzle is as follows.

[0031] The material moves from back to front. After encountering the diversion section 7, it is divided into multiple streams (8 streams in the figure). Each stream enters the first flow channel 11 through the guide channel 15. As it flows forward in the first flow channel 11, it continuously crosses the isolation zone 14 and enters the second flow channel 12. In the second flow channel 12, it flows through the filter holes 13 into the hollow flow channel 10 of the filter element 3, and finally flows into the second conveying channel 16 to be extruded. When crossing the isolation zone 14, the material undergoes a process of diversion and thinning. Under the pressure of the isolation zone 14 and the inner wall of the first conveying channel 4, the material is compacted, which has a melting effect, allowing large particles to melt more thoroughly. At the same time, when the material passes through the filter holes 13, the filter holes 13 can filter impurities. Furthermore, when the material passes through the filter holes 13 and converges and cross-blends in the hollow flow channel 10, the material is mixed more evenly, achieving a mixing effect. Finally, the material will flow from the hollow flow channel 10 into the second conveying channel 16 and be ejected from the outlet of the sub-nozzle 2.

[0032] The above description of the embodiments is intended to enable those skilled in the art to understand and apply this application. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, this application is not limited to the embodiments described herein, and any improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from the scope and spirit of this application are within the scope of this application.

Claims

1. A melt-enhancing compounding filter nozzle, the nozzle comprising a flange connector and a sub-nozzle mounted at the front end of the flange connector, wherein a first conveying channel and a second conveying channel are provided at the axial center of the flange connector and the sub-nozzle, the nozzle being characterized in that, The nozzle includes a filter element with a hollow flow channel at its center. The tail end of the filter element is closed. The filter element has a flow-diverting section, a mixing and filtering section, and an installation section arranged sequentially from the tail end to the front end along the axial direction. The outer diameter of the installation section and the flow-diverting section is the same as the inner diameter of the first material conveying channel. The outer diameter of the mixing and filtering section is smaller than the inner diameter of the first material conveying channel. The side wall of the mixing and filtering section has a first flow channel and a second flow channel arranged alternately. The second flow channel has a filter hole that connects to the hollow flow channel of the filter element. The side wall of the flow-diverting section has multiple guide grooves, and each guide groove connects to the tail end of the first flow channel.

2. The melt-enhancing compounding filter nozzle as described in claim 1, characterized in that, An isolation strip is provided between the first flow channel and the second flow channel, and the distance between the outer wall of the isolation strip and the inner wall of the first material conveying channel is 0.1~1mm.

3. The melt-enhancing compounding filter nozzle as described in claim 1, characterized in that, Each of the second flow channels has 50 to 500 filter holes.

4. The melt-enhancing compounding filter nozzle as described in claim 1 or 3, characterized in that, The pore size of the filter is 0.5~2mm.

5. The melt-enhancing compounding filter nozzle as described in claim 1, characterized in that, The length-to-diameter ratio of the mixing and filtering section is 3~5:

1.

6. The melt-enhancing compounding filter nozzle as described in claim 1, characterized in that, The depth of the first and second flow channels is 2~5mm.

7. The melt-enhancing compounding filter nozzle as described in claim 1, characterized in that, The number of first and second flow channels in the mixing and filtering section is 4 to 10.

8. The melt-enhancing compounding filter nozzle as described in claim 1, characterized in that, The splitter section is tapered, wider at the front and narrower at the back.

9. The melt-enhancing compounding filter nozzle as described in claim 1, characterized in that, The front end of the hollow flow channel is connected to the second fluid channel.

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