CN111730815A - An injection molding device for preventing runner breakage - Google Patents

Abstract

The invention provides an injection molding device for preventing a runner from being fractured, which comprises a front mold mechanism and a rear mold mechanism, wherein the front mold mechanism comprises a front mold panel and a pulling pin, a positioning ring and a sprue bush are arranged in the front mold panel, the positioning ring and the sprue bush are coaxially arranged, the top of the pulling pin is fixedly arranged on the positioning ring, a runner is arranged in the sprue bush, the runner comprises a main runner and a sub-runner, and the sub-runner is clamped on the side wall of the pulling pin. The invention provides an injection molding device for preventing a runner from being broken, which increases the contact area and the friction force between a pulling pin and the runner and protects the runner from being easily stuck in a mold.

Description

An injection molding device for preventing runner breakage

technical field

The invention relates to the field of injection molding, in particular, to an injection molding device for preventing flow passage breakage.

Background technique

At present, the injection mold industry is undergoing continuous technological innovation and transformation. In the three-plate mold using the point gate sleeve, the pull pin is used to temporarily fix the runner of the point gate part on the runner plate, and the gate The mouth is cut off from the molded product.

In the prior art, the front end portion of the pulling pin is in the shape of an undercut, which can forcibly release the runner of the point gate portion from the point gate sleeve. The contact area between the pull pin and the runner is small, and the runner is easy to stick and break in the mold, which increases the maintenance cost of the mold.

SUMMARY OF THE INVENTION

In view of this, the present invention provides an injection molding device that prevents the flow channel from breaking, which solves the problem that the flow channel is easy to stick and break in the mold.

To this end, the present invention provides an injection molding device for preventing runner breakage, including a front mold mechanism and a rear mold mechanism, the front mold mechanism includes a front mold panel and a pulling pin, and a positioning ring and a gate are arranged in the front mold panel. The sleeve, the positioning ring and the sprue sleeve are arranged coaxially, the top of the pulling pin is fixedly installed on the positioning ring, the sprue sleeve is provided with a runner, and the runner includes a main runner and a branch runner, and the branch runner is clamped at the bottom of the pull pin. on the side wall.

Further, the runner is embedded in the pulling pin.

Further, the surface of the pulling pin is provided with a groove, and the runner is fixedly installed in the groove.

Further, the depth of the groove is equal to the thickness of the runner.

Further, the end surface of the main channel is arc-shaped.

Further, the end face of the main channel is clamped on the side wall of the pulling pin.

Further, the front die mechanism further includes a stripper plate and a front template, a stripper plate is arranged below the front die plate, a front template is arranged below the stripper plate, and a front die is arranged at the bottom of the front template.

Further, a lock module is provided on one side of the front mold mechanism.

Further, the rear mold mechanism includes a rear mold base plate, a mold foot and a rear template.

Further, the die feet are fixedly installed on the bottom plate of the rear mold, the rear template is fixedly installed on the mold feet, and a rear mold core is arranged on the rear template.

The invention provides an injection molding device for preventing flow channel breakage, which is a three-plate injection mold. Its working principle is as follows: during injection molding, the front mold mechanism and the rear mold mechanism are closed, and the plastic passes through the main flow channel, The runner dispenses injection molded inserts positioned on the front mold core. After the injection molding is completed, the rear mold mechanism goes down, the front mold core and the rear mold core have not been separated, the stripper plate separates the runner from the front mold core, and the end of the runner is separated from the product. On the side wall, the contact area between the pulling pin and the runner is increased, and the friction between the pulling pin and the runner is increased, so the runner is not easy to stick and break when it is separated from the front mold core. Then the rear mold mechanism continues to descend, and the pulling pin separates the flow channel from the discharge plate, which is convenient for disassembling the flow channel.

The invention provides an injection molding device that prevents the flow channel from breaking, increases the contact area and friction between the pulling pin and the flow channel, and protects the flow channel from sticking and breaking in the mold.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and are not to be considered limiting of the invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

1 is a schematic structural diagram of an injection molding device for preventing flow channel breakage provided by an embodiment of the present invention;

2 is a schematic diagram of the installation structure of a pulling pin and a flow channel in an injection molding device for preventing flow channel breakage provided by an embodiment of the present invention;

FIG. 3 is a disassembled view of a pulling pin and a flow channel in an injection molding device for preventing flow channel breakage according to an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

Example 1:

Referring to FIGS. 1 to 3 , an injection molding device for preventing runner breakage provided by Embodiment 1 of the present invention is shown, including a front mold mechanism 1 and a rear mold mechanism 2 , and the front mold mechanism 1 includes a front mold panel 11 . And the pulling pin 12, the front mold panel 11 is provided with a positioning ring 6 and a gate sleeve 3, the positioning ring 6 and the gate sleeve 3 are arranged coaxially, the top of the pulling pin 12 is fixedly installed on the positioning ring 6, and the runner 4 It includes a main channel 41 and a branch channel 42 , and the branch channel 42 is clamped on the side wall of the pulling pin 12 .

Specifically, referring to FIGS. 1 to 3 , the front die mechanism 1 further includes a stripper plate 13 and a front template 14 , a stripper plate 13 is arranged below the front die plate 11 , a front platen 14 is arranged below the stripper plate 13 , and the front platen The bottom of 14 is provided with a front mold core 141 .

Specifically, referring to FIGS. 1 to 3 , the rear mold mechanism 2 includes a rear mold bottom plate 21 , a mold foot 22 and a rear template 23 , the mold foot 22 is fixedly installed on the rear mold bottom plate 21 , and the rear template 23 is fixedly installed on the mold foot 22 . , the rear template 23 is provided with a rear mold core 231 .

The invention provides an injection molding device for preventing flow channel breakage, which is a three-plate injection mold. Its working principle is as follows: during injection molding, the front mold mechanism and the rear mold mechanism are closed, and the plastic passes through the main flow channel, The runner dispenses injection molded inserts positioned on the front mold core. After the injection molding is completed, the rear mold mechanism goes down, the front mold core and the rear mold core have not been separated, the stripper plate separates the runner from the front mold core, and the end of the runner is separated from the product. On the side wall, the contact area between the pulling pin and the runner is increased, and the friction between the pulling pin and the runner is increased, so the runner is not easy to stick and break when it is separated from the front mold core. Then the rear mold mechanism continues to descend, and the pulling pin separates the flow channel from the discharge plate, which is convenient for disassembling the flow channel.

The invention provides an injection molding device that prevents the flow channel from breaking, increases the contact area and friction between the pulling pin and the flow channel, and protects the flow channel from sticking and breaking in the mold.

Embodiment 2:

Referring to FIGS. 1 to 3 , an injection molding device for preventing runner breakage provided by Embodiment 2 of the present invention is shown in the drawings. On the basis of the above-mentioned embodiments, this embodiment further makes the following improvements as improvements Technical solution: the runner 42 is embedded in the pulling pin 12; the surface of the pulling pin 12 is provided with a groove 121, the runner 32 is fixedly installed in the groove 121, and the depth of the groove 121 is equal to the thickness of the runner 42 ; The end surface of the main channel 42 is arc-shaped, and the end surface of the main channel 42 is clamped on the side wall of the pulling pin 12 .

The runner is embedded in the groove of the pulling pin, and the pulling pin wraps the runner in it, which further increases the contact area between the pulling pin and the runner, increases friction, and reduces the friction between the runner and the mold. The contact area greatly reduces the risk of sticking and breaking of the shunt. In order to make the installation of the pulling pin and the flow channel more suitable, the end face of the main flow channel is arc-shaped and clamped on the side wall of the pulling pin.

Embodiment three:

Referring to FIGS. 1 to 3, the drawings show an injection molding device for preventing runner breakage provided by Embodiment 3 of the present invention. On the basis of the above-mentioned embodiment, this embodiment further makes the following improvements. Technical solution: a lock module 5 is arranged on one side of the front mold mechanism 1 .

One end of the lock module is fixedly installed on the front mold mechanism, and the other end is fixedly connected to the rear mold mechanism when the mold is hoisted as a whole to prevent the front mold mechanism from being separated from the rear mold mechanism.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (10)

1. The utility model provides a prevent cracked injection moulding device of runner, its characterized in that includes front mould mechanism (1) and back mould mechanism (2), front mould mechanism (1) includes front mould panel (11) and draws material round pin (12), be provided with holding ring (6) and runner cover (3) in front mould panel (11), holding ring (6) with runner cover (3) are coaxial to be arranged, draw material round pin (12) top fixed mounting in on holding ring (6), be provided with runner (4) in runner cover (3), runner (4) include sprue (41) and subchannel (42), subchannel (42) joint is in draw on the lateral wall of material round pin (12).

2. An injection molding apparatus for preventing runner breakage as claimed in claim 1, wherein the runner (42) is embedded in the lifter pin (12).

3. An injection molding apparatus for preventing runner from being broken as claimed in claim 2, wherein the surface of the material pulling pin (12) is provided with a groove (121), and the branch runner (42) is fixedly installed in the groove (121).

4. An injection molding apparatus as claimed in claim 3, wherein the depth of the groove (121) is equal to the thickness of the runner (42).

5. An injection molding apparatus for preventing runner breakage as claimed in claim 1, wherein an end surface of the main runner (41) is curved.

6. An injection molding apparatus for preventing runner from breaking as claimed in claim 5, wherein an end surface of the main runner (41) is snapped on a side wall of the pulling pin (12).

7. An injection molding apparatus for preventing runner from being broken according to claim 1, wherein the front mold mechanism (1) further comprises a stripper plate (13) and a front mold plate (14), the stripper plate (13) is disposed below the front mold plate (11), the front mold plate (14) is disposed below the stripper plate (13), and a front mold core (141) is disposed at the bottom of the front mold plate (14).

8. An injection molding apparatus for preventing runner from being broken according to claim 1, wherein a lock module (5) is provided at one side of the front mold mechanism (1).

9. An injection molding apparatus for preventing runner breakage as claimed in claim 1, wherein said rear mold mechanism (2) includes a rear mold base plate (21), a mold leg (22), and a rear mold plate (23).

10. The injection molding apparatus for preventing runner from being broken as claimed in claim 9, wherein the mold leg (22) is fixedly installed on the rear mold base plate (21), the rear mold plate (23) is fixedly installed on the mold leg (22), and the rear mold plate (23) is provided with a rear mold core (231).

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