Wear resistant plasticizing screw head for plastic machines

Abstract

A kind of wear-resistant plasticizing screw head for plastic machine, including the head of taper and the connecting portion that can be connected on the screw of plastic machine, the reverse ring is movably sleeved on the connecting portion, the inner wall of the reverse ring is left with the material passage that can pass material between connecting portion outer wall, the end face of the reverse ring can be with the end face of head top contact, the discharge slot that can be communicated material passage is provided on the head, and the end face of the head corresponding to reverse ring is spacedly distributed with the insertion slot, and the corresponding tungsten rod is fixed in any insertion slot, and the end of tungsten rod inserted in insertion slot extends the end face of head.The utility model has the advantages of: tungsten rod is high temperature resistant, wear resistant, and has the effect of wear-resistant buffer, the end face of reverse ring is contacted with tungsten rod first, reduces the abrasion of head end face, prolongs the service life of screw head, the end face of head can keep the shape complete for a longer time, so as to reduce the probability that the problems such as discharging yellow, black, burning, filling deficiency, product repeat precision difference etc.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine screw technology, and more particularly to a wear-resistant plasticizing screw head used in plastic injection machines. Background Technology

[0002] In the plastics machinery industry, the traditional three small components—screw head, check ring, and thrust ring—are subjected to high pressure, high temperature, and high speed, leading to fatigue wear and causing numerous problems such as unstable injection, reverse injection, and yellowing or blackening of the finished product. In practical applications, these three components operate in high-temperature, high-pressure, and high-speed environments, while also experiencing relative rotational wear. Particularly in non-fork-type plasticizing structures, during pre-plasticizing, the check ring experiences rotational wear in contact with the screw head end face; during injection, the check ring and thrust ring experience high contact pressure; the reciprocating axial movement of the check ring leads to contact fatigue wear; and the plastic, especially high-viscosity plastics containing additives, experiences flow wear with the plasticized parts.

[0003] A Chinese invention patent application (CN202210275621.5) entitled "A Seamless Screw Head Assembly and Its Installation Method" discloses a seamless screw head assembly and its installation method. The screw head assembly includes a screw head, a spacer, a check ring, and a glue-passing head. The spacer is fixed to the screw head, and the glue-passing head is sleeved on one end of the screw head. The check ring is sleeved on the screw head and located between the glue-passing head and the spacer. One end of the screw head has an external thread and a front guide in sequence. The middle part of the glue-passing head has an internal thread and a glue-passing head sealing guide. The external thread and the internal thread are matched. The glue-passing head sealing guide is sleeved outside the front guide, and the front guide and the glue-passing head sealing guide are heat-fitted together. This screw head assembly can solve the problem of color variation in injection molded products and is low in cost. However, this structure still does not solve the problem of easy wear on the screw head end face, therefore the structure of this screw head needs further improvement. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a wear-resistant plasticizing screw head for plasticizing machines with long service life and high wear resistance, in view of the above-mentioned existing technology.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: This wear-resistant plasticizing screw head for plasticizing machines includes a conical head and a connecting part that can be connected to the screw of the plasticizing machine. A check ring is movably sleeved on the connecting part. A material channel for material to pass through is left between the inner wall of the check ring and the outer wall of the connecting part. The end face of the check ring can abut against the end face of the head. A discharge groove that can communicate with the material channel is provided on the head. The feature is that slots are distributed at intervals on the end face of the head corresponding to the check ring. A corresponding tungsten rod is fixed in each slot. The end of the tungsten rod inserted into the slot extends out of the end face of the head.

[0006] As an improvement, the end face of the check ring opposite the slot can preferably be provided with spaced-apart grooves for inserting rods, each groove containing a corresponding tungsten rod, the end of which extends out of the end face of the check ring. This also protects the end face of the check ring, extending its service life.

[0007] As a further improvement, the grooves for the inserts can preferably be evenly distributed on the end face of the check ring. This ensures effective protection at all points on the end face.

[0008] Further improvements include the tungsten rod being preferably a long, cylindrical shape, which facilitates manufacturing and installation.

[0009] In a further improvement, the radial cross-section of the tungsten rod can preferably be one of the following: circular, annular, equilateral triangle, square, regular hexagon, or regular octagon.

[0010] As an improvement, a thrust ring may preferably be provided on the connecting part, and the anti-reverse ring is sleeved on the connecting part between the head and the thrust ring.

[0011] As an improvement, the head may preferably include a tapered segment with a gradually decreasing diameter and a cylindrical segment with a constant diameter, with the slot disposed on the cylindrical segment. The tungsten rod slot is easier to machine.

[0012] As an improvement, the bottom surface of the discharge trough can preferably be curved, resulting in smoother material discharge.

[0013] Further improvements could be made by using a spiral groove as the discharge trough, which can improve discharge efficiency.

[0014] As an improvement, the surfaces of both the head and the check ring are preferably provided with a nitrided layer, further extending their service life.

[0015] Compared with the prior art, the advantages of this utility model are as follows: slots are distributed at intervals on the head end face corresponding to the check ring, and a corresponding tungsten rod is fixed in each slot. The end of the tungsten rod inserted into the slot extends out of the head end face. The tungsten rod is resistant to high temperature and wear, and plays a wear-resistant buffering role. The end face of the check ring contacts the tungsten rod first, reducing the wear of the head end face and extending the service life of the screw head. The head end face can maintain its shape integrity for a longer time, thereby reducing the probability of problems such as yellowing, blackening, burning, insufficient filling, and poor repeatability of products. The material discharge effect is more ideal. Attached Figure Description

[0016] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 A three-dimensional image from another angle;

[0018] Figure 3 yes Figure 1 Enlarged view of section I;

[0019] Figure 4 yes Figure 2 Enlarged view of Part II. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] like Figures 1 to 4 As shown, the wear-resistant plasticizing screw head for a plasticizing machine in this embodiment includes a conical head 1 and a connecting part 10 that can be connected to the screw of the plasticizing machine. A check ring 2 is movably fitted on the connecting part 10. A material channel is left between the inner wall of the check ring 2 and the outer wall of the connecting part, allowing material to pass through. The end face of the check ring 2 can abut against the end face of the head 1. A discharge groove 11 that connects to the material channel is provided on the head 1. Slots are distributed at intervals on the end face 12 of the head corresponding to the check ring 2. A corresponding tungsten rod 3 is fixed in each slot, and the end of the tungsten rod inserted into the slot extends out of the end face 12 of the head. Inserting grooves are distributed at intervals on the end face of the check ring 2 opposite to the slots. A corresponding tungsten rod 3 is fixed in each inserting groove, and the end of the tungsten rod inserted into the inserting groove extends out of the end face of the check ring. The inserting grooves are evenly distributed on the end face of the check ring 2. The tungsten rod 3 is a long strip-shaped column. The radial cross-section of the tungsten rod 3 is one of the following: circular, annular, equilateral triangle, square, regular hexagon, or regular octagon.

[0022] A thrust ring 4 is provided on the connecting part 10, and a check ring 2 is fitted onto the connecting part 10 between the head 1 and the thrust ring 4. The head 1 includes a tapered section with a gradually decreasing diameter and a cylindrical section with a constant diameter, and a slot is provided on the cylindrical section. The bottom surface of the discharge trough 11 is an arc surface. The discharge trough 11 is a spiral groove that can improve the discharge efficiency. Both the surface of the head 1 and the check ring 2 are provided with a nitrided layer.

Claims

1. A wear-resistant plasticizing screw head for a plasticizing machine, comprising a conical head (1) and a connecting part (10) that can be connected to the screw of the plasticizing machine, wherein a check ring (2) is movably fitted on the connecting part (10), a material channel for material to pass through is provided between the inner wall of the check ring (2) and the outer wall of the connecting part, the end face of the check ring (2) can abut against the end face of the head (1), and a discharge groove (11) for communicating with the material channel is provided on the head (1), characterized in that: Slots are distributed at intervals on the head end face (12) corresponding to the check ring (2), and a corresponding tungsten rod (3) is fixed in each slot. The end of the tungsten rod inserted in the slot extends out of the head end face (12).

2. The wear-resistant plasticized screw head according to claim 1, characterized in that: The anti-reverse ring (2) opposite to the slot has grooves for inserting rods distributed at intervals on its end face. Each groove has a corresponding tungsten rod (3) fixed in it, and the end of the tungsten rod inserted in the groove extends out of the anti-reverse ring end face.

3. The wear-resistant plasticizing screw head according to claim 2, characterized in that: The grooves of the insert are evenly distributed on the end face of the check ring (2).

4. The wear-resistant plasticizing screw head according to claim 3, characterized in that: The tungsten rod (3) is a long, cylindrical shape.

5. The wear-resistant plasticized screw head according to claim 4, characterized in that: The radial cross-section of the tungsten rod (3) is one of the following: circular, annular, equilateral triangle, square, regular hexagon, or regular octagon.

6. The wear-resistant plasticized screw head according to any one of claims 1 to 5, characterized in that: A thrust ring (4) is provided on the connecting part (10), and the anti-reverse ring (2) is sleeved on the connecting part (10) between the head (1) and the thrust ring (4).

7. The wear-resistant plasticized screw head according to any one of claims 1 to 5, characterized in that: The head (1) includes a tapered segment with a gradually decreasing diameter and a cylindrical segment with a constant diameter, and the slot is disposed on the cylindrical segment.

8. The wear-resistant plasticized screw head according to any one of claims 1 to 5, characterized in that: The bottom surface of the discharge trough (11) is an arc surface.

9. The wear-resistant plasticized screw head according to claim 8, characterized in that: The discharge trough (11) is a spiral trough that can improve discharge efficiency.

10. The wear-resistant plasticized screw head according to any one of claims 1 to 5, characterized in that: The surfaces of the head (1) and the check ring (2) are both provided with a nitrided layer.

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