Injection molding machine filter nozzle

Abstract

The utility model relates to injection molding machine nozzle technical field, concretely relates to a kind of injection molding machine filtering nozzle, including nozzle, secondary filter element and primary filter element;Secondary filter element and primary filter element are sequentially embedded in the nozzle inside installation;The glue outlet of nozzle is equipped with glue outlet, its inside adjacent glue outlet is sequentially equipped with mounting groove a and mounting groove b, and the glue inlet of nozzle is equipped with sink;Secondary filter element includes mounting bracket, conical filter screen and fixed frame;The injection molding machine filtering nozzle uses multistage collaborative mechanism, primary filter element uses bottom closed column structure to cooperate with oblique filter hole, and the inertial force generated by the flow direction mutation of melt is used to drive large particle impurities to sedimentation zone actively and concentrate interception;Secondary filter element innovatively uses reverse conical filter screen framework, so that impurities are temporarily stored in bottom accommodating groove by reverse sliding along conical surface to glue inlet, to avoid filter screen surface blockage;With the modularization joint structure of retainer and fixed frame, realize filter screen impact resistance rigid fixation and convenient maintenance.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine nozzle technology, specifically to an injection molding machine filter nozzle. Background Technology

[0002] The injection molding machine filter nozzle is a precision component installed at the front end of the injection molding machine nozzle. Its core function is to perform final filtration of molten plastic before it is injected into the mold cavity through a built-in fine filter, effectively intercepting impurities such as carbides, metal shavings, and unmelted material particles. This protects the expensive mold gate and cavity from damage, avoids surface and internal defects such as black spots and streaks in the products, significantly improves the product qualification rate, and reduces downtime maintenance caused by impurities clogging or mold damage.

[0003] Injection molding machine filter nozzles are crucial for ensuring continuous and stable production and are key consumables for improving injection molding quality and efficiency. However, they still have certain problems: 1) Due to the straight structure and vertical filter holes of traditional filter elements, impurities easily escape with the mainstream direction when the molten material flows through; 2) Impurities accumulate on the surface of existing filter screens, easily forming a covering layer, resulting in a reduction in filtration area and a sudden increase in system back pressure; 3) Traditional welding or bolt fixing is prone to filter screen deformation or micro-cracks due to thermal stress / vibration; 4) Replacing existing filter elements requires complete disassembly, and damaged filter screens are difficult to repair. Therefore, in view of the above situation, there is an urgent need to develop an injection molding machine filter nozzle to overcome the shortcomings in current practical applications and meet current needs. Utility Model Content

[0004] The purpose of this invention is to provide a filter nozzle for injection molding machines to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an injection molding machine filter nozzle, comprising a nozzle, a secondary filter element, and a primary filter element;

[0006] The secondary filter element and the primary filter element are sequentially embedded and installed inside the nozzle;

[0007] The nozzle has a glue outlet hole at the glue outlet end, and an installation groove a and an installation groove b are arranged in sequence inside the nozzle near the glue outlet hole. The nozzle also has a sink groove at the glue inlet end.

[0008] The secondary filter element includes a mounting bracket, a conical filter screen, and a fixing bracket; the mounting bracket is embedded in the mounting groove a, and the conical filter screen is fixed inside the mounting bracket by the fixing bracket;

[0009] The primary filter element has a columnar structure with multiple axially distributed connecting grooves on its outer wall. These grooves are equidistantly distributed radially. Multiple filter holes are provided within the connecting grooves. The end of the primary filter element closest to the limiting plate is the feed end, while the bottom outer wall away from the limiting plate does not have filter holes.

[0010] One end of the primary filter element is equipped with a limiting disc that is compatible with the settling tank.

[0011] Specifically, by designing the primary filter element's columnar structure without filter holes on the outer wall at the bottom, a closed deposition zone is formed at the bottom of the filter element, effectively trapping large particles of impurities. Combined with the inclined filter holes within the connecting groove (directing from the inside out and from the nozzle output end to the input end), the flow direction of the molten material is forcibly changed, enhancing the inertial separation effect of impurities. Simultaneously, the conical filter screen of the secondary filter element and the bottom receiving space formed by the mounting structure continuously collect impurities that have penetrated the primary filter element. This multi-stage synergistic filtration mechanism significantly reduces the risk of filter screen clogging, avoids abnormal increases in system pressure, extends the filter element's service life, and ensures the stability of the injection molding process.

[0012] Preferably, the filter holes extend obliquely from the inner wall of the primary filter element toward the outer wall, and the oblique direction points from the output end of the nozzle to the input end, with the filter holes forming an angle of 30°-60° with the axial direction of the primary filter element.

[0013] Preferably, the angle between the filter pores and the axial direction of the primary filter element is 45°.

[0014] Specifically, the filter holes are designed to extend at an angle from the inner wall of the primary filter element towards the outer wall, with the direction pointing from the nozzle output end to the input end. Combined with an angle of 30°-60°, this causes a sudden change in the flow direction of the molten material as it flows through the filter holes. Large particles of impurities are thrown towards the non-porous deposition area at the bottom of the primary filter element due to inertia and are concentrated and trapped, significantly improving the impurity capture efficiency. This avoids abnormal increases in system back pressure caused by impurity blockage, ensuring the stability of the injection molding process and extending the service life of the filter element.

[0015] Preferably, the mounting bracket is composed of a retainer and an outer retainer; the retainer is fixed inside the outer retainer and is tapered, with its tip facing the nozzle inlet end and its bottom end connected to the inner wall of the outer retainer; a bottom receiving groove is formed between the retainer and the inner wall of the outer retainer.

[0016] Specifically, the mounting frame consists of a retainer and an outer retainer. The retainer has a conical structure with its tip facing the nozzle inlet end. The bottom receiving groove formed by the retainer and the inner wall of the outer retainer allows impurities in the molten material to slide down along the conical surface of the retainer towards the inlet end and be temporarily stored in the receiving groove after being intercepted by the conical filter screen. This prevents impurities from accumulating and covering the effective filtration area of ​​the filter screen. At the same time, the reverse conical design allows the material flow to spread evenly on the surface of the filter screen, reducing local impact pressure. Combined with the buffer space of the receiving groove, this effectively prevents the filter screen from clogging and breaking, ensuring the long-term stable operation of the secondary filtration system.

[0017] Preferably, the retainer has a groove a on its edge and a groove b on its top; the fixing frame is adapted to groove a and groove b to fix the conical filter screen.

[0018] Specifically, the retainer has a slot a at its edge and a slot b at its top. Through three-dimensional adaptation and locking with the fixing frame, the conical filter screen is rigidly fixed in both the radial and axial directions, effectively resisting the deformation of the filter screen caused by the high-speed impact of the molten material. At the same time, the modular snap-fit ​​structure facilitates quick disassembly and maintenance of the filter screen, avoids thermal stress damage caused by traditional welding, ensures the stability of the filtration accuracy and service life of the conical filter screen, and maintains the reliability of the impurity temporary storage function of the containment tank.

[0019] Compared with the prior art, this utility model provides a filter nozzle for injection molding machines, which has the following beneficial effects:

[0020] This injection molding machine's filter nozzle employs a multi-stage collaborative mechanism. The primary filter element uses a bottom-closed columnar structure with inclined filter holes, utilizing the inertial force generated by the sudden change in melt flow direction to actively drive large particles of impurities to the deposition zone for concentrated interception. The secondary filter element innovatively adopts a reverse conical filter screen architecture, allowing impurities to slide down the conical surface in the opposite direction to the glue inlet end and be temporarily stored in the bottom receiving groove, avoiding clogging of the filter screen surface. Combined with the modular snap-fit ​​structure of the retainer and fixing frame, it achieves impact-resistant rigid fixation of the filter screen and convenient maintenance. The entire system, through a closed-loop design of dynamic interception, directional flow guidance, and rigid protection, significantly improves impurity capture efficiency while fundamentally solving the problem of filter screen clogging and damage, extending filter element life, and ensuring the stability of the injection molding process. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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.

[0022] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the nozzle of this utility model;

[0024] Figure 3 This is a partial cross-sectional view of the nozzle of this utility model;

[0025] Figure 4 This is an exploded view of the entire utility model;

[0026] Figure 5 This is an exploded view of the secondary filter element of this utility model;

[0027] Figure 6 This is a schematic diagram of the mounting frame structure of this utility model;

[0028] Figure 7This is a partial cross-sectional view of the mounting bracket of this utility model;

[0029] Figure 8 This is a schematic diagram of the fixing frame structure of this utility model;

[0030] Figure 9 This is a schematic diagram of the primary filter element structure of this utility model;

[0031] Figure 10 This is a partial cross-sectional view of the primary filter element of this utility model;

[0032] Figure 11 This is a side longitudinal sectional view of the primary filter element of this utility model.

[0033] In the diagram: 10, nozzle; 110, dispensing hole; 120, mounting slot a; 130, mounting slot b; 140, settling tank; 20, secondary filter element; 210, mounting bracket; 211, retainer; 2111, slot a; 2112, slot b; 212, receiving slot; 213, outer retainer; 220, conical filter screen; 230, fixing bracket; 30, primary filter element; 310, connecting slot; 320, filter hole; 330, limiting plate. Detailed Implementation

[0034] 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.

[0035] 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Example:

[0037] Please see Figures 1-11 This utility model provides a technical solution: an injection molding machine filter nozzle, including a nozzle 10, a secondary filter element 20 and a primary filter element 30;

[0038] The secondary filter element 20 and the primary filter element 30 are sequentially embedded in the nozzle 10;

[0039] The nozzle 10 has a glue outlet hole 110 at the glue outlet end, and an installation groove a120 and an installation groove b130 are sequentially provided inside the nozzle 10 near the glue outlet hole 110. The nozzle 10 also has a sink groove 140 at the glue inlet end.

[0040] The secondary filter element 20 includes a mounting bracket 210, a conical filter screen 220, and a fixing bracket 230; the mounting bracket 210 is embedded in the mounting groove a120, and the conical filter screen 220 is fixed inside the mounting bracket 210 by the fixing bracket 230;

[0041] The primary filter element 30 has a columnar structure, and its outer wall is provided with multiple axially distributed connecting grooves 310, which are equidistantly distributed radially. Multiple filter holes 320 are provided in the connecting grooves 310. The end of the primary filter element 30 near the limiting disk 330 is the feed end, and the bottom outer wall away from the limiting disk 330 does not have filter holes 320.

[0042] The primary filter element 30 has a limiting disc 330 at one end that is compatible with the settling tank 140.

[0043] Specifically, by designing that the columnar structure of the primary filter element 30 does not have filter holes 320 on the outer wall of its bottom, a closed deposition zone is formed at the bottom of the filter element, effectively trapping large particles of impurities. In conjunction with the inclined filter holes 320 in the connecting groove 310 (from the inside out and from the output end of the nozzle 10 to the input end), the flow direction of the molten material is forcibly changed, enhancing the inertial separation effect of impurities. At the same time, the bottom receiving space 212 formed by the conical filter screen 220 of the secondary filter element 20 and the mounting bracket 210 continuously collects impurities that have penetrated the primary filter element. The multi-stage synergistic filtration mechanism significantly reduces the risk of filter screen clogging, avoids abnormal increases in system pressure, extends the service life of the filter element, and ensures the stability of the injection molding process.

[0044] Preferably, the filter hole 320 extends obliquely from the inner wall of the primary filter element 30 toward the outer wall, and the oblique direction is from the output end of the nozzle 10 to the input end, and the filter hole 320 forms an angle of 30°-60° with the axial direction of the primary filter element 30.

[0045] Preferably, the angle between the filter pore 320 and the axial direction of the primary filter element 30 is 45°.

[0046] Specifically, the filter holes 320 extend inclinedly from the inner wall of the primary filter element 30 towards the outer wall, with the direction pointing from the output end to the input end of the nozzle 10. Combined with an inclined angle of 30°-60°, this causes a sudden change in the flow direction of the molten material as it flows through the filter holes 320. Large particles of impurities are thrown towards the non-porous deposition area at the bottom of the primary filter element 30 by inertia and are concentrated and trapped, significantly improving the impurity capture efficiency. This avoids abnormal increases in system back pressure caused by impurity blockage, ensuring the stability of the injection molding process and extending the service life of the filter element.

[0047] Preferably, the mounting bracket 210 is composed of a retainer 211 and an outer retainer 213; the retainer 211 is fixed inside the outer retainer 213 and is conical, with its tip facing the glue inlet end of the nozzle 10 and its bottom end connected to the inner wall of the outer retainer 213; a bottom receiving groove 212 is formed between the retainer 211 and the inner wall of the outer retainer 213.

[0048] Specifically, the mounting frame 210 consists of a retainer 211 and an outer retainer 213. The retainer 211 has a conical structure with its tip facing the glue inlet end of the nozzle 10. The bottom receiving groove 212 formed by the retainer 211 and the inner wall of the outer retainer 213 allows impurities in the molten material to slide down along the conical surface of the retainer 211 towards the glue inlet end after being intercepted by the conical filter screen 220, and be temporarily stored in the receiving groove 212, thus preventing impurities from accumulating and covering the effective filtration area of ​​the filter screen. At the same time, the reverse conical design allows the material flow to spread evenly on the surface of the filter screen, reducing local impact pressure. Combined with the buffer space of the receiving groove 212, it effectively prevents the filter screen from clogging and breaking, ensuring the long-term stable operation of the secondary filtration system.

[0049] Preferably, the retainer 211 has a slot a2111 on its edge and a slot b2112 on its top; the fixing frame 230 is adapted to the slots a2111 and b2112 to fix the conical filter screen 220.

[0050] Specifically, the retainer 211 has a slot a2111 on its edge and a slot b2112 on its top. Through three-dimensional adaptation and locking with the fixing frame 230, the conical filter screen 220 is rigidly fixed in both the radial and axial directions, effectively resisting the deformation of the filter screen caused by the high-speed impact of the molten material. At the same time, the modular snap-fit ​​structure facilitates quick disassembly and maintenance of the filter screen, avoids thermal stress damage caused by traditional welding, ensures the stability of the filtration accuracy and service life of the conical filter screen 220, and maintains the reliability of the impurity temporary storage function of the receiving groove 212.

[0051] Working principle: After the molten plastic enters the primary filter element 30 from the glue inlet end of the nozzle 10, it first passes through the filter holes 320 that extend from the inner wall to the outer wall. Due to the sudden change in flow direction and the inertial force generated by the tilt angle, large particles of impurities are thrown to the bottom closed area of ​​the primary filter element 30 and concentrated for interception. When the pre-filtered molten material continues to flow through the secondary filter element 20, the reverse conical filter screen 220 guides the impurities to slide down the cone surface in the opposite direction to the glue inlet end and temporarily store them in the bottom receiving groove 212 to avoid clogging of the conical filter screen 220. Finally, the molten material penetrates the conical filter screen 220 and is output through the glue outlet 110 of the nozzle 10. The entire process is carried out through a three-stage synergistic mechanism of dynamic interception and directional flow guidance, which maintains stable system pressure while efficiently separating impurities.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A filter nozzle for an injection molding machine, characterized in that: Includes nozzle (10), secondary filter element (20) and primary filter element (30); The secondary filter element (20) and the primary filter element (30) are sequentially embedded in the nozzle (10); The nozzle (10) has a glue outlet hole (110) at the glue outlet end, and an installation groove a (120) and an installation groove b (130) are provided in sequence inside the nozzle (10) near the glue outlet hole (110). The nozzle (10) also has a sink groove (140) at the glue inlet end. The secondary filter element (20) includes a mounting bracket (210), a conical filter screen (220), and a fixing bracket (230); the mounting bracket (210) is embedded in the mounting groove a (120), and the conical filter screen (220) is fixed inside the mounting bracket (210) by the fixing bracket (230); The primary filter element (30) has a columnar structure, and its outer wall is provided with a plurality of axially distributed connecting grooves (310), which are equidistantly distributed radially; the connecting grooves (310) are provided with a plurality of filter holes (320), and the end of the primary filter element (30) near the limiting disk (330) is the feed end, while the bottom outer wall away from the limiting disk (330) does not have filter holes (320). The primary filter element (30) is provided with a limiting plate (330) at one end that is adapted to the settling tank (140).

2. The injection molding machine filter nozzle according to claim 1, characterized in that: The filter hole (320) extends obliquely from the inner wall of the primary filter element (30) toward the outer wall, and the oblique direction is from the output end of the nozzle (10) to the input end. The filter hole (320) forms an angle of 30°-60° with the axial direction of the primary filter element (30).

3. A filter nozzle for an injection molding machine according to claim 2, characterized in that: The angle between the filter pore (320) and the axial direction of the primary filter element (30) is 45°.

4. The injection molding machine filter nozzle according to claim 1, characterized in that: The mounting bracket (210) consists of a retainer (211) and an outer retainer (213); the retainer (211) is fixed inside the outer retainer (213) and is conical, with its tip facing the glue inlet end of the nozzle (10) and its bottom end connected to the inner wall of the outer retainer (213); a bottom receiving groove (212) is formed between the retainer (211) and the inner wall of the outer retainer (213).

5. A filter nozzle for an injection molding machine according to claim 4, characterized in that: The retainer (211) has a slot a (2111) on its edge and a slot b (2112) on its top; the fixing frame (230) is adapted to slot a (2111) and slot b (2112) to fix the conical filter screen (220).

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