Sprue bush of plastic mold

Abstract

The utility model relates to the field of sprue bushes, in particular to a sprue bush of a plastic mold, which comprises a bush body, the bush body is sequentially provided with a flange part, a positioning part and an inserting rod part from top to bottom, the flange part is used for being butted with a nozzle of an injection molding machine, the positioning part is used for being connected with a mold panel, and the inserting rod part is used for being connected with a splitter plate of the mold. An injection molding runner penetrating through the sleeve body is arranged in the sleeve body, a pouring gate head is arranged at the end, away from the positioning part, of the inserting rod part, a pressure injection opening is formed in the pouring gate head and is in butt joint with and communicated with the injection molding runner, a connecting ring groove is formed in the inserting rod part, and a connecting sleeve is arranged at the end, close to the inserting part, of the pouring gate head. The connecting sleeve can be detachably connected with the connecting ring groove, so that the sleeve body is combined with the sprue head, the sprue head is replaced according to the actual production requirement, the flow speed of plastic passing through the pressure jet orifice is changed so as to adapt to splitter plates of various molds, the application range is wider, and the production cost can be effectively saved.

Description

Technical Field

[0001] This utility model relates to the field of sprue sleeves, and in particular to a sprue sleeve for a plastic mold. Background Technology

[0002] Injection molds are specialized tools used in the plastics processing industry to mold plastic products. Their main function is to heat and melt plastic raw materials, inject them into the mold cavity under high pressure, and then cool and solidify them in the mold to obtain plastic products of the desired shape and size. Injection molds provide an efficient, low-cost, and streamlined production method and are an indispensable piece of equipment in modern industrial production.

[0003] The sprue bushing, also known as a sprue, gate nozzle, or gate filler, is a key component in injection molds. Its primary function is to connect the mold to the injection molding machine. The sprue bushing allows molten plastic material to flow from the injection molding machine nozzle into the mold's internal runner. It ensures that the plastic material enters the mold cavity smoothly and stably, where the molding process is completed. The design and quality of the sprue bushing directly affect the stability of the injection molding process and the quality of the final product.

[0004] Molten plastic enters the runner from the mains channel by the pressure within the mains channel. When the injection mold core is changed, the manifold is also replaced. Different manifolds have different numbers of channels, and the more channels there are, the greater the pressure required. The pressure of molten plastic entering the runner is related to the cross-section of the runner. The smaller the cross-section, the faster the plastic flows and the farther it is sprayed. In existing sprue bushings, the diameter of the port near the manifold is fixed, which makes it impossible for the sprue bushing to be used with different manifolds. When the manifold is replaced, the sprue bushing also needs to be replaced. Utility Model Content

[0005] In order to overcome the shortcomings of existing technical solutions, this utility model provides a sprue sleeve for plastic molds, which can effectively solve the technical problem of the limited applicability of sprue sleeves.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A sprue sleeve for a plastic mold includes a sleeve body. From top to bottom, the sleeve body has a flange, a positioning part, and an insert rod. The flange is used to connect with the nozzle of an injection molding machine, the positioning part is used to connect with the mold panel, and the insert rod is used to connect with the mold's manifold. An injection channel is provided inside the sleeve body, its axis coinciding with the axis of the sleeve body. The injection channel communicates with the flange. A sprue head is provided at the end of the insert rod away from the positioning part. A pressure injection port is provided inside the sprue head, connecting and communicating with the injection channel. A connecting ring groove is provided inside the insert rod. A connecting sleeve is provided at the end of the sprue head near the insertion part. The connecting sleeve can be detachably connected to the connecting ring groove, allowing the sleeve body and the sprue head to be combined.

[0008] Furthermore, the connecting sleeve is provided with external threads, the inner wall of the connecting ring groove is provided with internal threads, and the connecting sleeve is threadedly connected to the insertion rod.

[0009] Furthermore, an inner gasket and an outer gasket are provided between the insert rod and the sprue. The inner gasket is used to seal the gap between the insert rod and the sprue, and the outer gasket is used to increase the friction between the insert rod and the sprue.

[0010] Furthermore, a positioning groove is provided at one end of the gating nozzle near the insertion rod, and a positioning boss is provided at one end of the insertion rod near the gating nozzle. After the gating nozzle and the insertion part are combined, the positioning boss is inserted into the positioning groove.

[0011] Furthermore, the flange is provided with a positioning notch to improve the nozzle docking accuracy. When the nozzle docks with the flange, the protrusion on the nozzle engages with the positioning notch.

[0012] Furthermore, a pressing surface is provided between the flange portion and the positioning portion, and mounting screw holes are provided on the edge of the positioning portion.

[0013] Compared with the prior art, the beneficial effects of this utility model are: it is equipped with a detachable sprue, and different sprues can be replaced and assembled with the sleeve. The diameter of the pressure injection nozzle inside the different sprues is different. The sprues can be replaced according to the actual production needs to change the flow rate of plastic when passing through the pressure injection nozzle, so as to adapt to the manifold of various molds, with a wider range of applications and can effectively save production costs. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0015] Figure 2 This is an exploded view of the structure of this utility model;

[0016] Figure 3 This is a cross-sectional view of the present invention;

[0017] The numbers in the diagram are: 1-sleeve body, 2-flange part, 3-positioning part, 4-insertion rod part, 5-injection runner, 6-positioning notch, 7-mounting screw hole, 8-sprue, 9-pressure injection nozzle, 10-connecting sleeve, 11-connecting ring groove, 12-positioning boss, 13-positioning groove, 14-plane. Detailed Implementation

[0018] 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.

[0019] The following is combined Figures 1-3 A detailed description of the sprue sleeve for a plastic mold according to this utility model is provided below:

[0020] A sprue sleeve for a plastic mold includes a sleeve body 1. From top to bottom, the sleeve body 1 has a flange 2, a positioning part 3, and an insert rod 4. The flange 2 is used to mate with the nozzle of an injection molding machine, the positioning part 3 is used to connect with the mold panel, and the insert rod 4 is used to connect with the mold's manifold plate. An injection runner 5 is provided inside the sleeve body 1, penetrating the sleeve body 1. The axis of the injection runner 5 coincides with the axis of the sleeve body 1. The injection runner 5 communicates with the flange 2. The flange 2 is provided with a positioning notch 6 to improve the nozzle mating accuracy. When the nozzle mates with the flange 2, the protrusion on the nozzle engages with the positioning notch 6. A pressing surface is provided between the flange 2 and the positioning part 3. The edge of the positioning part 3 is provided with mounting screw holes 7.

[0021] The insertion rod portion 4 is provided with a sprue 8 at the end away from the positioning portion 3. A pressure injection port 9 is provided inside the sprue 8. The pressure injection port 9 is connected to and communicates with the injection channel 5. A connecting ring groove 11 is provided inside the insertion rod portion 4. A connecting sleeve 10 is provided at the end of the sprue 8 near the insertion portion. The connecting sleeve 10 can be detachably connected to the connecting ring groove 11, so that the sleeve 1 and the sprue 8 are combined. A positioning groove 13 is provided at the end of the sprue 8 near the insertion rod portion 4. A positioning boss 12 is provided at the end of the insertion rod portion 4 near the sprue 8. After the sprue 8 and the insertion portion are combined, the positioning boss 12 is inserted into the positioning groove 13.

[0022] The connecting sleeve 10 is provided with an external thread, and the inner wall of the connecting ring groove 11 is provided with an internal thread. The connecting sleeve 10 is threadedly connected to the insert rod part 4. An inner gasket and an outer gasket are provided between the insert rod part 4 and the sprue head 8. The inner gasket and the outer gasket are located on the inner and outer sides of the connecting sleeve 10. The inner gasket is used to seal the gap between the insert rod part 4 and the sprue head 8, and the outer gasket is used to increase the friction between the insert rod part 4 and the sprue head 8. The side walls of the sprue head 8 and the insert rod part 4 are provided with a flat surface 14 for wrench clamping. During assembly, the flat surface 14 of the sprue head 8 and the insert rod part 4 can be clamped by two wrenches respectively, and then the sprue head 8 or the insert rod part 4 can be rotated for installation.

[0023] This embodiment provides a sprue sleeve for a plastic mold, which is equipped with a detachable sprue head 8. Different sprue heads 8 can be replaced and assembled with the sleeve body 1. The diameter of the pressure injection nozzle 9 inside the different sprue heads 8 is different. The sprue head 8 can be replaced according to the actual production needs to change the flow rate of plastic when passing through the pressure injection nozzle 9, so as to adapt to the manifold of various molds, with a wider range of applications and effective savings in production costs.

[0024] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A sprue sleeve for a plastic mold, comprising a sleeve body, wherein the sleeve body is provided with a flange portion, a positioning portion, and an insert portion from top to bottom; the flange portion is used to mate with the nozzle of an injection molding machine; the positioning portion is used to connect with the mold panel; the insert portion is used to connect with the mold's manifold plate; an injection channel penetrating the sleeve body is provided within the sleeve body; the axis of the injection channel coincides with the axis of the sleeve body; the injection channel communicates with the flange portion, characterized in that: The insertion rod is provided with a sprue at one end away from the positioning part. A pressure injection port is provided inside the sprue. The pressure injection port is connected to and communicates with the injection flow channel. A connecting ring groove is provided inside the insertion rod. A connecting sleeve is provided at one end of the sprue near the insertion part. The connecting sleeve can be detachably connected to the connecting ring groove, so that the sleeve and the sprue are combined.

2. The sprue sleeve for a plastic mold according to claim 1, characterized in that: The connecting sleeve is provided with external threads, and the inner wall of the connecting ring groove is provided with internal threads. The connecting sleeve is threadedly connected to the insertion rod.

3. The sprue sleeve for a plastic mold according to claim 2, characterized in that: An inner gasket and an outer gasket are provided between the insert rod and the sprue. The inner gasket is used to seal the gap between the insert rod and the sprue, and the outer gasket is used to increase the friction between the insert rod and the sprue.

4. A sprue sleeve for a plastic mold according to any one of claims 1-3, characterized in that: The end of the gating nozzle near the insertion rod is provided with a positioning groove, and the end of the insertion rod near the gating nozzle is provided with a positioning boss. After the gating nozzle and the insertion part are combined, the positioning boss is inserted into the positioning groove.

5. A sprue sleeve for a plastic mold according to any one of claims 1-3, characterized in that: The flange is provided with a positioning notch to improve the nozzle docking accuracy. When the nozzle docks with the flange, the protrusion on the nozzle engages with the positioning notch.

6. A sprue sleeve for a plastic mold according to any one of claims 1-3, characterized in that: A pressing surface is provided between the flange and the positioning part, and the edge of the positioning part is provided with mounting screw holes.

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