KR100704558B1 - sheath heater for manifold in hot runner system - Google Patents

Abstract

The present invention relates to a sheath heater for a manifold that can be fastened and dismantled with bolts for easy disassembly, assembly and maintenance in a hot runner system, and the device is for a manifold of a hot runner system. Claims [1] A sheath heater comprising: a manifold having a trench having a rectangular cross section having a predetermined length and a predetermined depth at a position to be heated, and having screw holes formed at predetermined intervals near the trench; Sheath heater formed in a rectangular cross-section so as to fit tightly into the trench to be inserted into the trench in the trench shape; It is characterized in that it comprises a plurality of removable ports made of a bolt and a washer fitted in the screw hole to secure the sheath heater.

Sheath Heater, Manifold, Hot Runner System

Description

Sheath heater for manifold {sheath heater for manifold in hot runner system}

1 is a perspective view illustrating a conventional sheath heater for a manifold;

2 is a plan view for explaining a sheath heater for a manifold according to the present invention.

3 is a cross-sectional view illustrating a sheath heater for a manifold according to the present invention.

<Brief description of symbols for the main parts of the drawings>

22a: heater tube 22b: heating wire

22c: closed capsule 24: washer

26: Bolt

The present invention relates to a siege heater, and more particularly, to a manifold siege heater that can be fastened and dismantled by bolts for easy disassembly, assembly, and maintenance in a hot runner system.

In general, an injection molding machine for injecting and molding a synthetic resin product injects a synthetic resin support material into a cylinder provided at one side, and injects it into a mold in a molten state in the cylinder. The upper mold includes a plurality of cavities formed in a lower mold. Manifolds are provided for evenly injecting resin into the cavity. The bottom of the manifold is provided with an injection nozzle for injecting resin into the cavity of the lower mold to fill the resin with high pressure, and when the resin filled in the cavity solidifies, the upper mold and the lower mold are separated from each other. The product will be taken out. In addition, in the cylinder of the injection molding machine, a heater wire is provided on the manifold and the injection nozzle so that the molten liquid resin does not harden in the process of flowing the resin into the cavity of the lower mold. Insert the heater wire into the hole to heat the manifold to prevent the resin from solidifying inside the manifold.The injection nozzle is wound around the heater wire to heat the injection nozzle to inject the liquid resin into the cavity formed in the lower mold. Prevent manifold from hardening in the injection nozzle before

As described above, the sheath heater is installed in various places of the manifold so as to maintain the liquid by heating the resin. The method of installing the sheath heater will be described below.

1 is a perspective view illustrating a general method for installing a sheath heater for a manifold, wherein a rectangular trench 10 is formed at a position where a sheath heater 12 is to be installed, and the sheath heater is formed inside the trench 10. (12) is inserted, and then the metal object 14 for sealing and fixing is hammered in and inserted. In order to facilitate the sealing and fixing, the metal 14 is inserted into the rectangular trench 10 slightly more than the inner diameter of the rectangular trench 10 so as to be hit by a hammer or the like so as not to fall out.

However, the conventional sheath heater has the following disadvantages.

First, since the sheath heater is only installed by hand at the manufacturing stage, it takes a lot of time.

Second, after the sheath heater is put in, the metal material 14 is put into a hammer or the like to seal, that is, molding, so that the contact degree between the sheath heater and the manifold is uneven for each product, so the consistency of heating efficiency is expected. It has a hard disadvantage.

Third, there is a problem that it is very difficult to maintain the already installed sheath heater, even if a defective product occurs in the manufacturing stage it is very difficult to take out the siege heater again.

Fourth, since the siege heater is installed by hitting with a hammer or the like, there is a problem that the siege heater is deteriorated due to an impact in the manufacturing stage.

Fifth, when manufacturing a new manifold has a disadvantage that a lot of time and a lot of manpower is invested in experimenting the temperature characteristics of the new sheath heater.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a sheath heater for a manifold which is detachable with a bolt and a screw without a separate sealing process.

A feature of the present invention for achieving the above object is a trench of a rectangular cross section having a predetermined length and a predetermined depth at a position to be heated in a sheath heater for a manifold of a hot runner system. A manifold having a screw hole formed at predetermined intervals near the trench; Sheath heater formed in a rectangular cross-section so as to fit tightly into the trench to be inserted into the trench in the trench shape; It includes a plurality of removable ports made of a bolt and a washer fitted in the screw hole to secure the sheath heater.

As a preferred embodiment, the sheath heater is filled with an insulating filling powder therein, the outside is made of a metal material, the heating wire is passed through the inner center, it is made of a closing capsule for closing both ends.

In a preferred embodiment, the removal port is a metal material.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a plan view showing a plane of the sheath heater for the manifold according to the present invention, in which a sheath heater is inserted into a trench trenched at a predetermined depth in an installation position on the manifold 1. have.

The sheath heater has a rectangular cross section, and is disposed at the center of the heater tube 22a and the heater tube 22a filled with metal filler to close both ends of the heating wire 22b and the heater tube 22a for performing a heating function. It consists of 22c. In this case, the metal filling material, for example, magnesia has a good thermal conductivity and insulates the heating wire and the heater tube by using powder having insulation.

Meanwhile, the sheath heater is inserted into the trench, and a washer 24 is installed to fix the sheath heater at a predetermined interval, and is fixed by tightening with a bolt 26.

The fixed installation cross section as described above will be described in more detail with reference to FIG. 3.

3 is a cross-sectional view taken along the line AA of FIG. 2, in which a trench having a predetermined depth is formed in the manifold 1, the whole sheath heater is inserted into the trench, and the screw is formed on the manifold 1. The sheath heater inserted in the hole position is fixed with a plurality of washers 24 and bolts 26.

Therefore, the siege heater of the manifold can be disassembled immediately by disassembling the bolt 26 and the washer 24 at any time, and the failure of the hot runner system can be promptly stopped since the siege heater can be replaced immediately. Can be removed.

The shape of the manifold described above is very diverse, and the shape of the sheath heater is also very diverse. Since the present invention can be applied to a manifold, the central idea of the present invention can be applied regardless of the shape of the manifold and the sheath heater.

According to the preferred embodiment of the present embodiment as described above, it is possible to immediately dismantle the broken or aged sieve heater anytime and anywhere, and to immediately repair the defective product generated during the manufacturing process, thereby rapidly increasing maintenance and production efficiency. There is an advantage to this.

In addition, since the manifold is used in the production line, it is possible to significantly reduce the case where the production line is stopped due to the failure of the sheath heater or to significantly reduce the time during which the production line is stopped.

In addition, since production efficiency is increased, manufacturing costs can be lowered, thereby providing an additional effect of securing price competitiveness.

Claims (3)

In the sheath heater for the manifold of the hot runner system, A manifold having a trench having a rectangular cross section at a predetermined length and a predetermined depth at a position to be heated, and having screw holes formed at predetermined intervals near the trench; Sheath heater formed in a rectangular cross-section so as to fit tightly into the trench to be inserted into the trench in the trench shape; A sheath heater for a manifold, characterized in that it comprises a plurality of detachable openings made of a bolt and a washer fitted in the screw hole to secure the sheath heater. The method of claim 1, The sheath heater is filled with an insulating filling powder inside, the outside is made of a metal material, the heating wire penetrates the center of the inside, the sheath heater for manifold, characterized in that consisting of a closing capsule for closing both ends . The method according to claim 1 or 2, The detachable opening is a sheath heater for manifold, characterized in that the metal material.

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