Nozzle device capable of replacing filter piece for injection molding machine

Abstract

A nozzle device used on an injection molding machine and capable of replacing a filter part comprises a nozzle head and a nozzle seat, the nozzle head is detachably connected to the nozzle seat, a filter cavity is formed in the connecting position of the nozzle seat and the nozzle head, a filter cavity opening is formed in one end of the filter cavity, the filter part is detachably arranged in the filter cavity, and the filter part is detachably connected to the nozzle seat. The radial section width of the filter part is larger than the diameter of the injection channel, and the filter part is of a cylindrical structure or a cylindrical structure; z-shaped material through grooves are distributed in the circumference of the cylindrical structure at intervals, one end of each material through groove is communicated with the material injection channel of the nozzle seat, the other end of each material through groove is communicated with the material injection channel of the nozzle head, a filtering opening is formed in the side wall of the middle of each material through groove, and each filtering opening is communicated with the front section and the rear section of the corresponding material through groove. The nozzle has the advantages that the filter part can be replaced according to the working requirement of the nozzle, the application is wide, and the problem of easy blockage can be solved while impurities are efficiently filtered.

Description

Technical Field

[0001] This invention relates to the field of auxiliary devices for injection molding machines, and more particularly to a nozzle device for injection molding machines that allows for the replacement of filter components. Background Technology

[0002] In the injection molding industry, the extensive use of recycled materials or high-mixing production has become a common practice to reduce costs. However, recycled materials often contain impurities such as incompletely melted particles, dust, and metal shavings, while high-mixing requires extremely high uniformity in the plastic melt. These impurities can lead to defects such as flow marks, black spots, and insufficient strength in injection molded products, severely reducing the product yield.

[0003] In existing technologies, filters are often installed at the front end of the injection molding machine screw or nozzle. However, traditional filters are mostly simple screen structures with the following inherent defects: First, they are prone to clogging: the small screen holes greatly increase flow resistance while filtering impurities, making them easy to clog quickly, leading to production interruptions and requiring frequent replacements; second, they are difficult to clean: clogged screens are difficult to clean thoroughly and are often discarded as consumables, increasing production costs and environmental pressure; third, they have a single function, only having a filtering function, with limited improvement on the plasticization and color mixing uniformity of the melt; fourth, they are not suitable for heat-sensitive materials: for heat-sensitive materials such as PVC and PC, the high shear heat and retention generated when flowing through the screen can easily lead to overheating and decomposition of the material.

[0004] A Chinese invention patent application with application number CN202110797869.3, entitled "Filter Nozzle," discloses a filter nozzle. This filter nozzle includes a sub-nozzle filter element, a flange connecting filter element, and at least one filter element. The filter element is a cylindrical structure with a filter cavity, and its circumference has several grooved filter elements spaced axially at certain positions from its proximal end. The distal opening of the grooved filter element connects to the nozzle orifice filter element, and its bottom has several first filter hole filter elements connecting to the filter cavity filter elements. The pore diameter of the first filter hole filter elements is smaller than that of the nozzle orifice filter element. This invention uses a grooved filter element and increases the number of filter holes to enlarge the filtration area. The external design with multiple grooves facilitates processing and effectively concentrates the filtered plastic within the grooves to achieve uniform flow. It also increases the overall strength of the filter element, preventing it from breaking under high pressure when there is a large amount of clogged iron filings. However, this filter nozzle is essentially an improvement on the original flat screen to a 3D screen. The filter holes in this structure are still relatively small, and the problem of easy clogging has not been overcome. At the same time, cleaning requires cleaning the inside of the filter element, making cleaning more difficult than the original flat structure, thus failing to solve the second problem of cleaning difficulty. In addition, regarding the fourth problem, since the first and second problems have not been well solved, the material is prone to stagnation when flowing through the screen, which increases the probability of material overheating and decomposition, thus failing to solve the fourth problem. Therefore, the structure of this filter nozzle needs further improvement. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a nozzle device for injection molding machines that can replace the filter element according to the working requirements of the nozzle, has wide application, and can overcome the problem of easy material blockage while efficiently filtering impurities.

[0006] The technical solution adopted by this invention to solve the above-mentioned technical problem is as follows: This nozzle device for injection molding machines, characterized in that it includes a nozzle head capable of injecting mixed material and a nozzle seat capable of being connected to the injection molding machine. The nozzle head is detachably connected to the nozzle seat. A filter chamber is provided at the connection position between the nozzle seat and the nozzle head. An opening that can be opened and sealed by the nozzle head is provided at one end of the filter chamber. A filter element is detachably disposed in the filter chamber, and the radial cross-sectional width of the filter element is approximately equal to that of the filter chamber. The filter element is adapted to and larger than the diameter of the injection channel of the nozzle device. It is selected from either a cylindrical structure that enables straight material flow or a cylindrical structure that enables Z-shaped tortuous material flow and filters impurities. Z-shaped material channels are distributed at intervals on the circumference of the cylindrical structure. One end of the material channel is connected to the injection channel of the nozzle seat, and the other end of the material channel is connected to the injection channel of the nozzle head. A filter opening for filtering impurities is provided on the middle side wall of the material channel. The filter opening connects the front and rear sections of the material channel.

[0007] As an improvement, the front end of the cylindrical structure is provided with a discharge groove, and the rear end of the cylindrical structure is provided with a feed groove. Continuous S-shaped baffle protrusions are distributed circumferentially on the side wall of the cylindrical structure, forming a material flow channel between adjacent axial baffle protrusions. Adjacent material flow channels are sequentially staggered and connected to the discharge groove or feed groove. The material flow channel is the front or rear section of the material channel. Filter grooves that can block impurities are distributed on the axial baffle protrusions. These filter grooves are filter openings and connect two adjacent material flow channels. The cylindrical structure is simple in structure. By guiding the material's S-shaped flow, it extends the residence time at the filtration position, achieving thorough filtration of the material. Simultaneously, the filter grooves can block impurities from passing through, thus playing a filtering role. The filter grooves are set perpendicular to the material flow direction along the material flow channel. Even if some impurities clog the filter grooves, the material can still flow forward along the material flow channel, allowing the material to flow from the preceding filter groove into the adjacent material flow channel, ensuring smooth material flow.

[0008] Further improvements include the addition of six material flow channels, specifically three feed channels connected to the feed groove and three discharge channels connected to the discharge groove. These feed and discharge channels are staggered along the circumference of the cylindrical structure. Due to the "3-in, 3-out" structure, the melt flows smoothly, reducing the likelihood of dead zones. Furthermore, the high-speed flow of the molten material has a scouring effect on the opening of the filter tank, mitigating the clogging process.

[0009] In a further improvement, the outlet of the feed trough can preferably be closed by a corresponding radial baffle protrusion, the inlet of the feed trough is connected to the feed groove, the inlet of the discharge trough can preferably be closed by a corresponding radial baffle protrusion, and the outlet of the discharge trough is connected to the discharge groove. This results in a compact structure and good flow guidance.

[0010] Further improvements include the material flow channel being preferably a wedge-shaped channel with a large opening at the top and a small opening at the bottom. This helps prevent material accumulation and allows for smooth material flow.

[0011] In a further improvement, the connection points between the material flow channel and the corresponding feed groove or discharge groove can preferably be inclined surfaces that facilitate material discharge. This helps ensure smooth material flow.

[0012] As a further improvement, the bottom surface of the feed groove and the discharge groove can preferably be an arc-shaped convex surface that can avoid material accumulation and facilitate material discharge.

[0013] As an improvement, the diameter of the central through-hole in the cylindrical structure is preferably the same as the diameter of the injection channel of the nozzle seat and the injection channel of the nozzle head. This avoids obstructing the material and facilitates smooth material discharge.

[0014] As an improvement, an end recess is preferably provided at the end of the nozzle seat, and an end groove is provided on the bottom surface of the end recess. The filter chamber is a cavity enclosed by the nozzle head end face and the inner wall of the end groove. This facilitates assembly and disassembly.

[0015] As a further improvement, an annular sealing groove capable of accommodating a sealing ring can preferably be provided at the root of the end recess, thereby improving sealing performance.

[0016] Compared with existing technologies, the advantages of this invention are as follows: The filter element is installed in the filter chamber, allowing for the selection of suitable filter elements based on the type of material to be processed. The size of the filter opening can be produced in multiple specifications according to the diameter requirements of the filtered impurities. Different cylindrical structures can be used for different materials to meet various filtration requirements, eliminating the need for multiple injection molding machines with different filter specifications. The angle of the filter opening can also be adjusted according to color mixing requirements, either perpendicular to the material channel or at a required angle, thereby changing the material flow direction to adjust the color mixing effect. Furthermore, it can be directly replaced with a cylindrical structure with an internal straight-through flow channel, completely avoiding material decomposition caused by shear overheating in heat-sensitive materials. It is evident that this invention enables different functions to be achieved on a single device, expanding the application scope and saving application and switching costs. The filter structure with filtration function adopts a cylindrical structure, with the impurity filtration part located on the surface of the cylindrical structure, facilitating cleaning. When the filter needs cleaning, simply disassemble the nozzle head to remove the filter for cleaning or replacement, resulting in extremely short maintenance time and significantly improved production efficiency. When the material tumbles over the filter tank into the discharge groove, it undergoes intense shearing, extrusion, and tumbling, a process equivalent to a highly efficient dynamic mixing, making the melt composition and temperature distribution of the masterbatch, recycled material, and new material more uniform, thereby directly improving the color consistency and mechanical properties of the product and achieving good mixing effect. Attached Figure Description

[0017] Figure 1 This is a perspective view of an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Side projection view;

[0019] Figure 3 yes Figure 2 Cross-sectional view along line AA;

[0020] Figure 4 yes Figure 2 A cross-sectional view along line AA while retaining the complete structure of the filter element;

[0021] Figure 5 yes Figure 4 Exploded structural diagram;

[0022] Figure 6 yes Figure 5 A 3D view of the filter element is displayed separately in the image;

[0023] Figure 7 yes Figure 5 A frontal projection view;

[0024] Figure 8 yes Figure 7 Cross-sectional view along the BB line;

[0025] Figure 9 yes Figure 1 Exploded structural diagram;

[0026] Figure 10 yes Figure 1 A structural breakdown diagram from another perspective;

[0027] Figure 11 This is a cross-sectional view of the external structure of the nozzle device along the central axis according to the second embodiment of the present invention;

[0028] Figure 12 yes Figure 11 The structure explodes. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] like Figures 1 to 10 As shown, the nozzle device for a replaceable filter element on an injection molding machine according to this embodiment includes a nozzle head 1 for injecting mixed material and a nozzle seat 2 for connecting to the injection molding machine. The nozzle head 1 is detachably connected to the nozzle seat 2. A filter chamber is provided at the connection position between the nozzle seat 2 and the nozzle head 1. An opening for the filter chamber, which can be opened and sealed by the nozzle head 1, is provided at one end of the filter chamber. A filter element is detachably provided in the filter chamber. The radial cross-sectional width of the filter element is adapted to the filter chamber and is larger than the diameter of the injection channel of the nozzle device. The filter element is selected from either a cylindrical structure 3 that enables straight material flow or a cylindrical structure 4 that enables Z-shaped tortuous material flow and filters impurities; in this embodiment, a cylindrical structure 4 is selected. A limiting protrusion 11 that can connect to the nozzle seat 2 is provided on the outer wall of the nozzle head 1. An annular groove for connecting a sealing gasket is provided at the root of the limiting protrusion 11. An end recess 21 is provided at the end of the nozzle seat 2, and an end groove 211 is provided on the bottom surface of the end recess 21. The filter chamber is a cavity formed by the nozzle head end face and the inner wall of the end groove 211. An annular sealing groove 212 that can accommodate a sealing ring is provided at the root of the end recess 211.

[0031] Z-shaped material channels 40 are spaced apart on the circumference of the cylindrical structure 4, such as... Figure 5 As shown in the figure, the dashed line illustrates a Z-shaped schematic, where the middle of the Z-shape is transformed into continuous and spaced filter openings. One end of the material channel 40 is connected to the injection channel 22 of the nozzle seat, and the other end of the material channel 40 is connected to the injection channel 12 of the nozzle head. Filter openings for filtering impurities are provided on the middle side wall of the material channel 40, and the filter openings connect the front and rear sections of the material channel 40.

[0032] The front end of the columnar structure 4 is provided with a discharge groove 401, and the rear end of the columnar structure 4 is provided with a feed groove 402. Continuous S-shaped baffle protrusions are distributed circumferentially on the side wall of the columnar structure 4. A material flow channel is formed between adjacent axial baffle protrusions 43. Adjacent material flow channels are sequentially staggered and connected to the discharge groove 401 or the feed groove 402. The material flow channel is the front or rear section of the material passage 40. Filter grooves 431 that can block impurities are distributed on the axial baffle protrusions 43. The filter grooves 431 are filter openings and connect two adjacent material flow channels.

[0033] There are six material flow channels in total, such as Figure 6 As shown, the six material flow channels are divided into three feed channels 42 connected to the feed groove 402 and three discharge channels 41 connected to the discharge groove 401. The feed channels 42 and discharge channels 41 are staggered on the circumference of the cylindrical structure 4. The outlet of the feed channel 42 is closed by the corresponding radial baffle protrusion 44, the inlet of the feed channel 42 is connected to the feed groove 402, the inlet of the discharge channel 41 is closed by the corresponding radial baffle protrusion 44, and the outlet of the discharge channel 41 is connected to the discharge groove 401. All material flow channels are wedge-shaped channels with a large opening at the top and a small opening at the bottom. The connection points between the material flow channels and the corresponding feed groove 402 or discharge groove 401 are all inclined surfaces 45 that facilitate material discharge. The bottom surfaces of the feed groove 402 and discharge groove 401 are arc-shaped convex surfaces 403 that prevent material accumulation and facilitate material discharge.

[0034] like Figure 11 and Figure 12 As shown, the second embodiment of the nozzle device for a replaceable filter element on an injection molding machine includes a nozzle head 1 capable of injecting mixed material and a nozzle seat 2 capable of being connected to the injection molding machine. The nozzle head 1 is detachably connected to the nozzle seat 2. A filter chamber is provided at the connection position between the nozzle seat 2 and the nozzle head 1. An opening for the filter chamber, which can be opened and sealed by the nozzle head 1, is provided at one end of the filter chamber. A filter element is detachably provided in the filter chamber. The radial cross-sectional width of the filter element is adapted to the filter chamber and is larger than the diameter of the injection channel of the nozzle device. The filter element is selected from either a cylindrical structure 3 that enables straight material flow or a columnar structure 4 that enables Z-shaped tortuous flow of material and filters impurities. In this embodiment, the cylindrical structure 3 is selected.

[0035] The diameter of the through hole 31 in the middle of the cylindrical structure 3 is the same as the diameter of the injection channel 22 of the nozzle seat and the injection channel 12 of the nozzle head.

[0036] An end recess 21 is provided at the end of the nozzle seat 2, and an end groove 211 is provided on the bottom surface of the end recess 21. The filter chamber is a cavity formed by the nozzle head end face and the inner wall of the end groove 211. An annular sealing groove 212 that can accommodate a sealing ring is provided at the root of the end recess 211.

Claims

1. A nozzle device for use on an injection molding machine with replaceable filter elements, characterized in that: The device includes a nozzle head (1) capable of injecting mixed materials and a nozzle seat (2) capable of being connected to an injection molding machine. The nozzle head (1) is detachably connected to the nozzle seat (2). A filter chamber is provided at the connection position between the nozzle seat (2) and the nozzle head (1). One end of the filter chamber has a filter chamber opening that can be opened and sealed by the nozzle head (1). A filter element is detachably installed in the filter chamber. The radial cross-sectional width of the filter element is adapted to the filter chamber and is larger than the diameter of the injection channel of the nozzle device. The filter element enables the material to pass through directly. One of the cylindrical structure (3) and the columnar structure (4) that can realize the Z-shaped tortuous flow of materials and filter impurities is selected; Z-shaped material channels (40) are distributed at intervals on the circumference of the columnar structure (4), one end of the material channel (40) is connected to the injection channel (22) of the nozzle seat, and the other end of the material channel (40) is connected to the injection channel (12) of the nozzle head. A filter opening that can filter impurities is provided on the middle side wall of the material channel (40), and the filter opening connects the front section and the rear section of the material channel (40).

2. The nozzle device according to claim 1, characterized in that: The front end of the columnar structure (4) is provided with a discharge groove (401), and the rear end of the columnar structure (4) is provided with a feed groove (402). Continuous S-shaped material-blocking protrusions are distributed circumferentially on the side wall of the columnar structure (4). A material flow channel is formed between adjacent axial material-blocking protrusions (43). Adjacent material flow channels are sequentially staggered and connected to the discharge groove (401) or the feed groove (402). The material flow channel is the front or rear section of the material passage (40). Filter grooves (431) that can block impurities are distributed on the axial material-blocking protrusions (43). The filter grooves (431) are filter openings. The filter grooves (431) are connected to two adjacent material flow channels.

3. The nozzle device according to claim 2, characterized in that: There are six material flow channels in total. The six material flow channels are divided into three feed channels (42) that are connected to the feed groove (402) and three discharge channels (41) that are connected to the discharge groove (401). The feed channels (42) and discharge channels (41) are arranged alternately on the circumference of the columnar structure (4).

4. The nozzle device according to claim 3, characterized in that: The outlet of the feed trough (42) is closed by the corresponding radial baffle protrusion (44), the inlet of the feed trough (42) is connected to the feed groove (402), the inlet of the discharge trough (41) is closed by the corresponding radial baffle protrusion (44), and the outlet of the discharge trough (41) is connected to the discharge groove (401).

5. The nozzle device according to claim 4, characterized in that: The material flow channels are all wedge-shaped channels with a large opening at the top and a small opening at the bottom.

6. The nozzle device according to claim 5, characterized in that: The connection points between the material flow channel and the corresponding feed groove (402) or discharge groove (401) are all inclined surfaces (45) that facilitate material discharge.

7. The nozzle device according to claim 6, characterized in that: The bottom surfaces of the feed groove (402) and the discharge groove (401) are arc-shaped convex surfaces (403) that can prevent material accumulation and facilitate material discharge.

8. The nozzle device according to any one of claims 1 to 7, characterized in that: The diameter of the through hole (31) in the middle of the cylindrical structure (3) is the same as the diameter of the injection channel (22) of the nozzle seat and the injection channel (12) of the nozzle head.

9. The nozzle device according to any one of claims 1 to 7, characterized in that: An end recess (21) is provided at the end of the nozzle seat (2), and an end groove (211) is provided on the bottom surface of the end recess (21). The filter cavity is a cavity formed by the nozzle head end face and the inner wall of the end groove (211).

10. The nozzle device according to claim 9, characterized in that: An annular sealing groove (212) capable of accommodating a sealing ring is provided at the root of the end recess (211).

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