JPH11156800A - Automatic heating-wire-cutting device of foaming synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic heating-wire-cutting device which can fuse smoothly a block member consisting of a foaming synthetic resin and having a hard skin layer and a core with a large water content. SOLUTION: While a pair of main electrode rod 12 are provided on the left and the right sides, or at the upper and the lower sides of a conveying means 11 to convey a block member 19 consisting of a foaming synthetic resin, a single fixed auxiliary electrode rod 13A, or two auxiliary electrode rods including this and another movable auxiliary electrode rod, are provided near the inside of one or both of the main electrode rods 12, and furthermore, a necessary number of electric heating wires 16 are stretched between the main electrode rods 12, and both ends of the electric heating wires 16 are insulation- held allowable to extend and contract so as to compose this automatic heating- wire-cutting device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam synthetic resin hot-wire automatic cutting device for cutting a block material made of a foamed synthetic resin into a smaller block material or a plate material depending on the application.

[0002]

2. Description of the Related Art A conventional hot-wire cutting apparatus for foamed synthetic resin comprises:
As shown in FIGS. 7 and 8, a required number of heating wires 1 are arranged on the left and right (or up and down) of a conveying means 2 such as a conveyor.
A tension is applied between the pair of electrode rods 3 in parallel, and a block material 4 made of a foamed synthetic resin such as styrofoam is passed between the two electrode rods 3 by the conveying means 2 at a speed v. 4 was blown into smaller block materials or plate materials by the heating wire 1 energized.

[0003]

However, in the block material 4 generally made of a foamed synthetic resin, the density and the hardness increase from the inside to the outside, and particularly, the skin layer 5 becomes the hardest. ing. Therefore, the fusing speed of the heating wire 1 a that blows the skin layer 5 tends to decrease as the heating wire 1 a approaches the skin layer 5.

[0004] In the block material 4, the water content increases as the position of the core 6 increases, so that the temperature of the heating wire 1 b that blows the core 6 decreases due to the moisture in the core 6.
Therefore, the fusing speed of the core 6 becomes slower than the other parts.

[0005] As described above, the fusing speed of the block material 4 is not uniform depending on the fusing location. Therefore, in the conventional hot-wire cutting apparatus, the fusing speed is made uniform by taking various measures as described below. At present, satisfactory results have not always been obtained.

For example, as shown in FIG. 9, in a device in which the heating wire 1 is stretched so as to avoid the skin layer 5, since the blown skin layer 5 is discarded as waste material, there is a drawback that much material is wasted. was there.

Although not shown, in a device in which the speed v of the conveying means 2 is adjusted to the lowest fusing speed to make the fusing speed uniform, not only the productivity of the device is reduced, but also the There is a disadvantage that a portion having a high fusing speed is excessively melted.

[0008] Further, as shown in FIG.
A part of both ends (or one end) of the heating wires 1a and 1b for fusing the core 6 is detachably short-circuited with an electric wire 8 via a clip 7, and the length of the heating wires 1a and 1b is changed to another portion. In a device in which the fusing speed of the skin layer 5 is increased by increasing the fusing current by making the heating wire 1 shorter than the fusing wire 1, contact failure occurs at the clipped portion, and the heating wires 1a and 1b at the portion are clipped. There was a drawback of disconnection. Also,
Since the positions of the skin layer 5 and the core 6 are also different each time the thickness of the block material 4 is different, the heating wires 1a, 1a, 1
The length of b must be adjusted, which is extremely troublesome and has the disadvantage of reducing productivity.

The present invention is an improvement of the conventional device, in which the length of the heating wire in the portion where the fusing speed is reduced is automatically adjusted,
An object of the present invention is to provide a hot wire automatic cutting device that can make the fusing speed of each heating wire uniform.

[0010]

In order to achieve the above object, a pair of main electrode rods is arranged on the left and right or up and down of the conveying means for conveying the block material made of the foamed synthetic resin of the present invention. At least one auxiliary electrode rod is arranged near the inner side of the electrode rod and spaced apart in the transport direction of the transport means, and a required number of heating wires are run in parallel between the main electrode rods. Both ends of the heat wire are insulated and supported via stretchable tension springs.

[0011]

In order to cut a block made of a foamed synthetic resin by the apparatus of the present invention, the block is passed between the two main electrode rods by a conveying means. Each heating wire is supplied with power from the main electrode rod and blows the block material into smaller block materials or plate materials depending on the application.

At this time, if a hard skin layer or a core having a high water content is present in the block material, the heating wire for fusing these portions has a lower fusing speed than the heating wire for fusing the other portions. Delayed entry into the interior. For this reason, these heating wires are pushed by the block material, and the tension springs at both ends are slightly extended, curved in an arc shape, and come into contact with the inner auxiliary electrode rod.

As a result, these heating wires are short-circuited between the auxiliary electrode rod and the main electrode rod, and the fusing current is increased. As a result, these heating wires automatically increase in fusing speed and become the same as the heating wire that blows other parts, and are blown while maintaining that state until the skin layer and core are blown off. go. When the skin layer and the core have been blown, these heating wires return to their original straight state, separate from the auxiliary electrode rods, and continue to blow in the same state as the heating wires that blow other parts. Even if the delay occurs again,
Since the above adjusting operation is repeatedly performed automatically, the block material is smoothly melted.

Although at least one auxiliary electrode rod is provided, for example, when two auxiliary electrode rods are used, it is preferable that one is a fixed type and the other is a movable type. With this configuration, by adjusting the position of the movable auxiliary electrode rod, the length of the heating wire that is short-circuited due to contact with both auxiliary electrode rods can be more significantly adjusted. The automatic adjustment of the fusing speed of the heating wire can be performed more accurately.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, but it is needless to say that the present invention is not limited to these embodiments.

Embodiment 1 FIG. 1 is a plan view showing a configuration of an automatic hot-wire cutting apparatus according to the present embodiment, and FIG. 2 is a left front view of FIG. As shown in these drawings, in the apparatus of the present embodiment, a pair of main electrode rods 12 are erected on the left and right sides of a conveying means 11 such as a conveyor, and near the inside of one main electrode rod 12 and Conveying means 1
One fixed auxiliary electrode rod 13A is fixed via a conductive support piece 14 so as to be spaced apart in one transport direction (the direction of arrow A in FIG. 1). An annular groove 15 for winding and fixing a heating wire 16 to be described later is formed around the outer periphery of the main electrode rod 12.
Are engraved in large numbers.

Between the two main electrode rods 12, a required number of heating wires for cutting 16 are extended in parallel in the horizontal direction. One end of an extendable tension spring 17 is connected to both ends of these heating wires 16, and the other end of the tension spring 17 is connected to a pair of insulating posts 18 erected outside the main electrode rod 12. Are tied up.

Reference numeral 19 denotes a block member made of a foamed synthetic resin placed on the conveying means 11. The illustrated block material 19 includes a hard skin layer 20 having a high density and a core 21 having a high moisture content. The foamed synthetic resin includes styrene foam, crosslinked polyethylene foam, polypropylene foam and the like.

Next, the operation of the apparatus having the above configuration will be described with reference to FIG. First, the heating wire 16 is energized from the main electrode rod 12, and then the conveying means 11 is driven in the direction of arrow A to pass the block material 19 between the two main electrode rods 12. The material 19 is blown.

At this time, the heating wire 1 for fusing the skin layer 20 is used.
6A and the heating wire 16B for fusing the core portion 21 have a lower fusing speed than the heating wire 16 for fusing the other portions due to the hardness of the skin layer and the temperature decrease due to the moisture of the core portion 21. Delayed entry into the interior. Therefore, the heating wires 16A and 16B are slightly pressed by the skin layer 20 and the core portion 21 and the tension spring 17 is extended, and finally, the heating wires 16A and 16B are curved in a bow shape as shown in the drawing. The heating wires 16B respectively contact the reinforcing electrode rods 13A.

As a result, the heating wires 16A and 16B are short-circuited between the reinforcing electrode rod 13A and the main electrode rod 12, and the fusing current is increased. As a result, the heating wire 16
In A and 16B, the fusing speed automatically increases and becomes the same speed as the other heating wires 16, and the fusing is continued while the short-circuit state is maintained until the fusing of the skin layer 20 and the core 21 is completed.

When the skin layer 20 and the core 21 are completely blown, the heating wires 16A and 16B are no longer pushed from the skin layer 20 and the core, return to their original straight state, and return to the auxiliary electrode rod 13A. , And the fusing is continued in the same state as the other heating wires 16. In addition, even if the heating wires 16A and 16B are delayed again, the above-described adjustment operation is repeatedly performed automatically, so that the block member 19 is smoothly blown.

It should be noted that sparks tend to occur when the auxiliary electrode rod 13A comes into point contact with the heating wire 16, and to avoid this, it is preferable to make a surface contact using a copper plate or the like.

Embodiment 2 FIG. 4 is a side view showing a configuration and an operation state of an automatic hot-wire cutting apparatus according to this embodiment. As shown in the figure, in the apparatus of the present embodiment, the conveying means 11A, 11
B is arranged with a space for extending the heating wire 16 therebetween, and a pair of main electrode rods 1 is provided above and below the transporting means 11A and 11B.
2 and a pair of insulating columns 18 are arranged in the horizontal direction, and fixed auxiliary electrode rods 13 are attached to the upper main electrode rods 12.
A is fixed via a conductive support piece 14.

Then, a required number of heating wires 16 are laid in parallel in the vertical direction between the two main electrode rods 12 via the space between the two conveying means 11A and 11B. It is connected to an insulating support column 18 via a tension spring 17. Other configurations are the same as in the first embodiment.

The operation and effect of the apparatus having the above configuration are the same as those of the first embodiment except that the block member 19 is blown vertically.

Embodiment 3 FIG. 5 is a plan view showing the structure and operation of an automatic hot-wire cutting apparatus according to this embodiment. As shown in the figure, the device of this embodiment is:
In the apparatus of the first embodiment (see FIG. 3), a fixed auxiliary electrode rod 13A is fixed to one of the main electrode rods 12, and a movable auxiliary electrode rod 13B is fixed to the other of the main electrode rods 12. Is similar to that of the first embodiment.

The movable auxiliary electrode rod 13B is
The distances H1 and H2 with respect to are adjustable.
In the apparatus of this embodiment, since the movable auxiliary electrode rod 13B is provided, the heating wires 16A, 16B which are short-circuited by the contact with both auxiliary electrode rods 13A, 13B by adjusting the distances H1, H2. Can be adjusted over a wider range than in the first embodiment. Therefore, the automatic adjustment of the fusing speed of the heating wires 16A, 16B can be performed more accurately.

Embodiment 4 FIG. 6 is a side view showing the configuration and operation of an automatic hot-wire cutting apparatus according to this embodiment. As shown in the figure, the device of this embodiment is:
In the apparatus of the second embodiment (see FIG. 4), a movable auxiliary electrode rod 13B is fixed to the upper main electrode rod 12, and a fixed auxiliary electrode rod 13A is fixed to the lower main electrode rod 12. Is similar to that of the second embodiment.

In the apparatus of the present embodiment, since the movable auxiliary electrode rod 13B is provided, the automatic adjustment of the fusing speed of the heating wires 16A and 16B is performed similarly to the third embodiment. Can be performed more accurately.

[0031]

As described above, according to the present invention,
The length of the heating wire that cuts the skin layer and the core of the block material that reduces the fusing speed is automatically partially short-circuited by the auxiliary electrode rod, and the fusing current is increased to increase the fusing speed. The fusing speed can be made uniform. Therefore, the fusing of the block material can be performed smoothly.

In a device having a movable type as well as a fixed type as the auxiliary electrode rod, the length of the heating wire can be adjusted over a wide range by adjusting the position of the movable auxiliary electrode rod. The function of automatically adjusting the fusing speed of the heating wire can be made more accurate.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a left front view of FIG.

FIG. 3 is a plan view showing the operation of the first embodiment of the present invention.

FIG. 4 is a side view showing the configuration and operation of a second embodiment of the present invention.

FIG. 5 is a plan view showing the configuration and operation of a third embodiment of the present invention.

FIG. 6 is a side view illustrating the configuration and operation of a fourth embodiment of the present invention.

FIG. 7 is a plan view showing an example of a conventional device.

FIG. 8 is a left front view of FIG. 7;

FIG. 9 is a front view showing another example of the conventional device.

FIG. 10 is a front view showing still another example of the conventional device.

[Explanation of symbols]

 11, 11A, 11B Transport means 12 Main electrode rod 13A Fixed auxiliary electrode rod 13B Movable auxiliary electrode rod 16, 16A, 16B Heating wire 17 Tension spring 19 Block material

Claims (2)

[Claims] 1. A pair of main electrode rods are arranged on the left and right or up and down of a transport means for transporting a block material made of a foamed synthetic resin, and near the inside of these main electrode rods and on the transport direction side of the transport means. At least one auxiliary electrode rod is arranged at a distance, and a required number of heating wires are laid in parallel between the main electrode rods, and both ends of these heating wires are insulated and supported via extendable tension springs. An automatic hot-wire cutting apparatus for foamed synthetic resin, comprising: 2. The apparatus according to claim 1, wherein two auxiliary electrode rods are arranged, one of which is a movable auxiliary electrode rod.