CN217621986U

CN217621986U - Sprue cutting mechanism of injection mold

Info

Publication number: CN217621986U
Application number: CN202221039565.7U
Authority: CN
Inventors: 汪明威; 郑杰; 高光华; 项杰
Original assignee: Zhejiag Taizhou Meiduo Mould Co ltd
Current assignee: Zhejiag Taizhou Meiduo Mould Co ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-10-21
Anticipated expiration: 2032-04-29

Abstract

The utility model relates to an injection mold's runner shutdown mechanism, including movable mould and cover half, still including being located top to one side, bullet piece, runner, spring on the movable mould and installing dog on the cover half, the system has the chamber of holding on the top to one side, the one end of bullet piece is passed hold the chamber and the system has the second inclined plane, the system has first inclined plane on the dog, the system has the standing groove on the bullet piece, the spring is located in the standing groove, the system has the lug on the bullet piece, the lug is close to the lopsidedness on top to one side is provided with the edge of a knife, the runner with the top contacts to one side. Compared with the prior art, the utility model has the advantages of small occupied space, simple structure, wide application range and stable performance, thereby saving the structural cost on the die and the production cost; arranging a movable elastic block, wherein a knife edge on the elastic block is gradually close to the sprue so as to cut off the sprue; the spring and the extrusion block can both realize the movement of the elastic block, and the production process of the product is more stable and reliable.

Description

Sprue cutting mechanism of injection mold

Technical Field

The utility model relates to an injection mold's runner shutdown mechanism belongs to injection mold technical field.

Background

Generally, after the plastic part is subjected to injection molding, a stub bar is connected with a product through a pouring gate, workers need to trim the pouring gate, the labor intensity is high, and the trimming of the pouring gate is not attractive. The conventional automatic gate breaking scheme is to design the gate as a submarine gate or a horn gate, but the thickness of the gate cannot exceed 1.5mm in general, otherwise the gate is easy to tear, and the gate is broken in the tunnel, so the application range of the scheme is very limited. At present, some auxiliary air cylinders or oil cylinders are arranged in the market for in-mold hot cutting sprue schemes, and the main principle is that a group of additional time sequence action control systems are added, and when mold pressure maintaining is finished or is about to be finished, a cutter is used for cutting off a sprue by straight jacking. However, the scheme occupies a large space, a plurality of injection molding parts on the market need to hide a sprue mark for attractiveness, and a sprue is designed at a position where a product is not easy to observe, so that the space inside the mold is narrow, and the scheme cannot be set.

SUMMERY OF THE UTILITY MODEL

The utility model aims at prior art's shortcoming, provide a little injection mold's of occupation space runner shutdown mechanism.

For realizing the purpose the utility model adopts the technical proposal that:

injection mold's runner shutdown mechanism, including movable mould and cover half, still including being located top, bullet piece, runner, spring and installation to one side on the movable mould dog on the cover half, the system has the chamber of holding to one side on the top, the one end of bullet piece is passed hold the chamber and the system has the second inclined plane, the system has first inclined plane on the dog, the system has the standing groove on the bullet piece, it has convex spring baffle to hold the intracavity system, the spring is located in the standing groove, the both ends of spring respectively with the cell wall of standing groove and spring baffle contacts, the system has the lug on the bullet piece, the lug is close to the lopsidedness on top is provided with the edge of a knife, the runner with the top contacts to one side.

As a further optimization of the above technical solution: when the die is closed, the spring is in an extension state, the first inclined plane and the second inclined plane are tightly attached, and a certain distance exists between the knife edge and the pouring gate.

As a further optimization of the above technical solution: the elastic block is characterized by further comprising an extrusion block, the extrusion block is installed on the movable die, a first vertical surface, a second vertical surface and a guide inclined surface connected with the first vertical surface and the second vertical surface are manufactured on the extrusion block, and the other end of the elastic block is provided with an ejection inclined surface, a reset inclined surface and a connection vertical surface connected with the ejection inclined surface and the reset inclined surface.

As a further optimization of the above technical solution: when the die is closed, the connecting vertical surface is tightly attached to the first vertical surface.

As a further optimization of the above technical solution: the runner is located at the end of the runner, an insertion groove and a positioning block located above the insertion groove are formed in the inclined top, the runner is clamped into the insertion groove, and the runner is in contact with the end of the positioning block.

Compared with the prior art, the utility model has the advantages of small occupied space, simple structure, wide application range and stable performance, thereby saving the structural cost on the die and the production cost; arranging a movable elastic block, wherein a knife edge on the elastic block is gradually close to the pouring gate, so that the pouring gate is cut off; the spring and the extrusion block can both realize the movement of the elastic block, and the production process of the product is more stable and reliable.

Drawings

Fig. 1 is a schematic view of the three-dimensional structure of the mold closing state of the present invention.

Fig. 2 is a schematic sectional structure diagram of the mold clamping state of the present invention.

Fig. 3 is a schematic sectional structure diagram of the middle mold closing process of the present invention.

Fig. 4 is a schematic perspective view of the middle spring block of the present invention.

Fig. 5 is a schematic view of the three-dimensional structure of the middle pitched roof of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description. As shown in fig. 1 to 5, the gate cutting mechanism of the injection mold comprises a movable mold and a fixed mold, and further comprises a lifter 1, an elastic block 2, a gate 3, an extrusion block 5, a spring 6 and a stopper 4 mounted on the fixed mold, which are positioned on the movable mold. The stopper 4 is formed with a first inclined surface 41. The extrusion block 5 is mounted on a movable die, and the extrusion block 5 is formed with a first vertical surface 51, a second vertical surface 52 located above the first vertical surface 51, and a guide inclined surface 53 connecting the first vertical surface 51 and the second vertical surface 52. The inclined top 1 is provided with a containing cavity, one end of the elastic block 2 penetrates through the containing cavity and is provided with a second inclined surface 24 which is in contact with the first inclined surface 41. The other end of the elastic block 2 is provided with an ejection inclined surface 25, a reset inclined surface 26 positioned below the ejection inclined surface 25 and a connecting vertical surface 27 connecting the ejection inclined surface 25 and the reset inclined surface 26. The elastic block 2 is provided with a placing groove 21, a convex spring baffle is arranged in the containing cavity, the spring 6 is positioned in the placing groove 21, and two ends of the spring 6 are respectively contacted with the groove wall of the placing groove 21 and the spring baffle. The elastic block 2 is provided with a convex block 22, and one side of the convex block 22 close to the inclined top 1 is obliquely provided with a knife edge 23.

In the above technical scheme: and a runner 7, wherein the sprue 3 is positioned at the end part of the runner 7. The inclined top 1 is provided with an insertion groove 11 and a positioning block 12 positioned above the insertion groove 11, a part of the flow channel 7 is clamped in the insertion groove 11, and the pouring gate 3 is contacted with the end surface of the positioning block 12. The positioning block 12 and the insertion groove 11 play a role in positioning the gate 13, and the inclined top 1 can drive the runner 7 to synchronously move.

The utility model discloses a working process as follows, during the mould compound die, spring 6 is in the extension state, and first inclined plane 41 and second inclined plane 24 are hugged closely, connect perpendicular 27 and first perpendicular 51 to hug closely, have the certain distance between edge of a knife 23 and the runner 3. The stopper 4 and the extrusion block 5 are used for positioning the elastic block 2, so that the elastic block 2 is prevented from moving when being injected, and the injection molding is influenced.

When the mold is opened, the fixed mold drives the stop block 4 to move upwards, the stop block 4 gradually does not extrude the elastic block 2 any more, the elastic force of the spring 6 starts to be released, and the elastic block 4 gradually moves towards the direction far away from the extruding block 5 under the matching of the first inclined plane 41 and the second inclined plane 24. In the above process, the knife edge 23 gradually approaches the gate 3 until the gate 3 is cut off. The inclined ejector 1 drives the elastic block 2 to perform ejection motion upwards. After the elastic force of the spring 6 is completely released, the elastic block 2 is completely separated from the extrusion block 5, and a gap of 0.1mm exists between the connecting vertical surface 27 and the second vertical surface 52 in the Z-axis direction, so that the elastic block 2 and the extrusion block 5 are prevented from interfering when the inclined top 1 moves downwards and returns, as shown in fig. 3. The reset inclined plane 26 facilitates downward movement and resetting of the elastic block 2.

When the spring 6 is damaged and fails, the extrusion block 5 is responsible for extruding the elastic block 2. When the mold is opened, the fixed mold drives the stop block 4 to move upwards, and the stop block 4 does not extrude the elastic block 2 any more. And then the ejector pin 1 drives the elastic block 2 to perform ejection motion upwards, the extrusion block 5 is installed on a movable die and keeps still, and in the process that the elastic block 2 moves upwards, the ejection inclined surface 25 is in contact with the guide inclined surface 53, so that the elastic block 2 moves towards the direction far away from the extrusion block 5. In the above process, the knife edge 23 gradually approaches the gate 3 until the gate 3 is cut off. The extrusion block 5 has the positioning effect on the elastic block 2 in the injection molding process, and can realize the movement of the elastic block 2, and even if the spring 6 is damaged and fails, the sprue 3 can be cut off, so that the production process of the product is more stable and reliable. And the utility model discloses occupation space is little, simple structure, and application scope is wide, and the stable performance has saved the structural cost on the mould promptly, has also saved manufacturing cost.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, all technical personnel in this technical field rely on the utility model discloses a conceive technical scheme that can obtain through logic analysis, reasoning or limited experiment on prior art's basis, all should fall into the utility model discloses a within the scope of protection.

Claims

1. The gate cutting mechanism of the injection mold comprises a movable mold and a fixed mold and is characterized by further comprising an inclined top (1), an elastic block (2), a gate (3), a spring (6) and a stop block (4) arranged on the fixed mold, wherein the inclined top (1) is provided with an accommodating cavity, one end of the elastic block (2) penetrates through the accommodating cavity and is provided with a second inclined surface (24), the stop block (4) is provided with a first inclined surface (41), the elastic block (2) is provided with a placing groove (21), the accommodating cavity is provided with a convex spring baffle, the spring (6) is positioned in the placing groove (21), two ends of the spring (6) are respectively contacted with the groove wall of the placing groove (21) and the spring baffle, the elastic block (2) is provided with a convex block (22), one side, close to the inclined top (1), of the convex block (22) is obliquely provided with a knife edge (23), and the gate (3) is contacted with the inclined top (1);

when the mold is closed, the spring (6) is in an extension state, the first inclined surface (41) and the second inclined surface (24) are tightly attached, and a certain distance is reserved between the knife edge (23) and the sprue (3).

2. The gate cutting mechanism of an injection mold according to claim 1, further comprising an extrusion block (5), wherein the extrusion block (5) is mounted on the movable mold, the extrusion block (5) is formed with a first vertical surface (51), a second vertical surface (52) and a guiding inclined surface (53) connecting the first vertical surface (51) and the second vertical surface (52), and the other end of the spring block (2) is formed with an ejecting inclined surface (25), a resetting inclined surface (26) and a connecting vertical surface (27) connecting the ejecting inclined surface (25) and the resetting inclined surface (26);

when the mold is closed, the vertical connecting surface (27) and the first vertical surface (51) are in close contact with each other.