JPS5928836Y2 - Heating device for square molds - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating device for a rectangular mold, and more particularly to a heating device for a mold for molding a synthetic resin molded product.

Conventional heating devices of this type have independent heaters fixedly attached to each surface of the mold by screws.

Such conventional products have the trouble of manufacturing because taps for attaching the heater must be machined on each surface, and the workability of attaching and detaching is extremely poor because screws are attached to each surface individually.
In addition, as the fixing screws seize, the adhesion between the mold surface and the heater is impaired, creating a gap between the two, and the wire breaks due to overheating due to a local decrease in thermal conductivity in this gap area. There were accidents during use that led to.

The purpose of this invention is to solve the problem of slanting and provide greater convenience in manufacturing and use. It is characterized by being able to be tightened so as to adhere to each surface in a predetermined manner.

The present invention is also characterized in that reinforcing ribs are provided across the presser plate and both flanges to prevent the presser plate portion and the heater from bending when the button is pressed at high temperatures, and to protect the connection terminals of the heater.

An example of the implementation of the present invention applied to a rectangular molding die of an extrusion molding machine A will be described in detail below based on the drawings.

The square molding die 1 has four continuous surfaces 1a, and is equipped with a heating device B' on the outer periphery, and is heated by the device B.
This is a well-known mechanism in which the resin passing through the resin passage 13 is heated.

Note that the shape of the passage 13 is arbitrary depending on the product to be manufactured.

The heating device B consists of one unit or an appropriate number of units (three units in the drawing), and the capital is equipped with heaters 2, which extend along each surface 1a of the mold 1, and are provided at adjacent edges. The flanges 4, 4... are separably connected to each other by connectors 5... and are composed of an open holding plate 3, which has a roughly frame shape. Heater 2
are formed so as to be able to surround each surface 1a in a predetermined tight manner.

Therefore, each folding plate 3 fixes the plate-shaped heater 2 with screws 6 and nuts 7, and also sets the flanges 4 at an angle of 45 degrees and connects 5 with bolts 8 and nuts 9. Even after the specified tightening, a gap a remains between the adjacent flanges 4.

This allows the heater 2 to be closely attached to the surface 1a without any gaps.

Further, the upper edges of the flanges 4, 4 are formed at a height higher than the tip of the connecting terminal 11 buttoned to the heater 2, which is exposed through the window hole 10 of the holding plate 3, while the reinforcing ribs 12, 12 are formed at the same height.
It is provided between both flanges 4, 4 on both sides of the Th holding plate 3, and the flanges 4, 4 higher than this are provided around the connection terminal 11.
It is surrounded and protected by the button and reinforcing ribs 12 and 12, and the presser plate 3 itself is reinforced and shaped into a predetermined plate shape so that it will not be distorted when heated.

This allows the heater 2 to be uniformly brought into close contact with the surface 1a.

Therefore, according to the present invention, depending on the size of the mold 1, an appropriate number of roughly frame-shaped parts can be freely attached and removed.

Since the present invention is constructed as described above, the roughly frame-shaped part consisting of the holding plate equipped with a heater can be easily attached and detached from the mold, and the attaching and detaching operation can be performed when disassembling the mold, etc. sex has improved significantly.

By adjusting the tightening of each connector, the heater can be evenly brought into close contact with the mold surface at each position, and because of the good adhesion, there is no disconnection caused by gaps.

[Brief explanation of drawings]

FIG. 1 is a side view of the heating device of the present invention inserted into a rectangular mold. Figure 2 is a partially enlarged front view along line ■-■. FIG. 3 is a front view of the heating device separated. FIG. 4 is an enlarged perspective view showing an exploded view of the heater and presser plate that constitute the heating device. In the figure, A is an extrusion molding machine, B is a heating device, 1 is a square mold, 1a... is a surface, 2... is a heater, 3...
is a presser plate, 4... is a flange, and 5... is a connector.

Claims (1)

[Scope of utility model registration request] A heating device having four continuous surfaces that is attached to a rectangular mold that is attached to an extruder, etc., which is equipped with a heater that runs along each surface of the mold, and has flanges provided on adjacent edges. A rectangular shape that is formed by a presser plate section that is separably connected with a connector and has a roughly frame shape, and that allows each heater to be tightened and enclosed in a predetermined tightness on each surface with the connector. Heating device for molding molds.