JPS583562B2 - Insulators and their forming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an insulator in which a plurality of insulating flanges are provided at predetermined intervals on an insulating rod, and is particularly suitable for a mounting rod of a cam contactor of a camshaft controller for a train, a support of a circuit breaker, etc. The present invention relates to an insulator and a molding device therefor.

For the mounting rod of the cam contactor of the camshaft controller for electric trains,
Because the length of the insulating rod and the spacing between each insulating flange will vary depending on the number of cam contactors, the potential difference between each cam contactor, etc., the insulating rod and insulating flange should be molded integrally with resin. It is difficult.

Therefore, conventionally, as shown in FIGS. 1 and 2, a rectangular insulating rod 1 and an insulating flange 2 having a square hole 3 slightly larger than the external dimensions of the insulating rod 1 were made separately. After inserting the insulating rod 1 into the square hole 3 of the flange 2,
These were adhesively fixed with adhesive 4.

However, since the adhesive must be applied uniformly over the entire circumference of these fitting portions, skill is required and the work is troublesome.

Especially when using a low-viscosity adhesive, if you apply the adhesive from above with the insulating rod upright, the applied adhesive will flow out, so keep the insulating rod horizontal and apply the adhesive from the side to the mating part. The work efficiency was very poor.

Furthermore, when a highly viscous adhesive is used, the adhesive does not penetrate into the inside of the fitting part and is only attached to the outside, resulting in weak adhesive strength and easy peeling.

When the adhesive is peeled off, a through gap is formed in the fitting portion between the two, the insulation creepage distance is shortened, and the effect of providing the insulation flange is lost.

An object of the present invention is to eliminate the drawbacks of the prior art described above, to provide an insulator that can be easily produced without requiring human labor and has excellent quality.

To achieve this objective, the present invention provides an insulator in which a plurality of insulating flanges are fixed at predetermined intervals on an insulating bar in order to increase the creepage distance, and the insulating flanges are molded and fixed on the insulating bar with resin. It is characterized by what it did.

An embodiment of the present invention will be described below with reference to FIG.

In Fig. 3, 1 is an insulating rod, which is constructed by wrapping a sheet-like insulating material such as glass cloth impregnated with phenolic resin or epoxy resin around a core metal, and then applying pressure and heat curing the insulating material. ing.

Further, reference numeral 5 denotes a plurality of insulating flanges provided on the insulating rod 1 at predetermined intervals, and a molding device (not shown) arranged around the insulating rod 1 is made of epoxy resin, quartz powder, and porcelain. It is molded by injecting a molding resin containing a filler such as powder or alumina and adding a hardening agent, and hardening it, and is fixed to the insulating rod 1 at the same time.

At this time, by employing a vacuum injection method or the like, it is possible to eliminate any voids at the bonding surface between the insulating rod 1 and the insulating flange 5, and it is also possible to roughen the bonding surface of the insulating rod 1 with sandpaper or the like. By flattening them, the adhesive strength between the insulating rod 1 and the insulating flange 5 can be further increased.

FIG. 4 shows a molding apparatus suitable for molding a plurality of insulating flanges 5 at predetermined intervals on the insulating bar 1 as described above.

This molding device includes a plurality of molds 6a and 6b that are divided into two vertically, each having an insulating flange molding space 7 for separately molding a plurality of insulating flanges 5, and a predetermined space between these molds. It consists of a plurality of intermediate molds 8a, 8b; 9a, 9b which are divided into upper and lower halves and held at intervals, and is constructed by assembling and fixing these molds and intermediate molds as desired.

Therefore, by inserting and fixing the insulating rod 1 into this molding device and injecting molding resin from the injection port 10 of the mold 6a, the insulating flange 5 is molded onto the insulating rod 1 and fixed at the same time.

At this time, by preparing the required number of intermediate molds with different axial length dimensions, any number of insulating flanges 5 can be formed on the insulating bar 1 by arbitrarily combining the intermediate molds and the forming mold. It can be easily molded into the desired position.

That is, by using the minimum necessary number of molds, it is possible to obtain molds that can be combined in a large number of ways.

In addition, as mentioned above, when molding an insulating flange using a mold, there is a gap between the insulating rod and the mold, so the molding resin flows out from this gap and adheres to the surface of the insulating rod. I don't like it.

In particular, when a molding resin with low viscosity is used, the amount of outflow increases.

FIG. 5 shows a molding device improved from this.

That is, the insulating flange molding cavity 7 of the molds 6a and 6b
On both sides of the insulating rod 1, there are two
Divided semicircular elastic members 11a and 1lb are provided.

As the material of this elastic member, a material such as silicone resin, Teflon, etc. is used, which has enough elasticity and heat resistance to adhere tightly to the mold and the insulating rod.

Therefore, the gap 12 existing between the insulating rod 1 and the molds 6a, 6b is completely closed by the elastic members 11a, 1lb, and the molding resin is prevented from flowing out.

When the insulating rod 1 is erected and the molding resin is injected from above, the elastic members 11a and 11b may be provided only on one side (in this case, the lower side) of the molds 6a and 6b.

As explained above, according to the present invention, in an insulator in which a plurality of insulating flanges are fixed at predetermined intervals on an insulating bar to increase the creepage distance, the insulating flanges are molded with resin on the insulating bar. Since they are firmly fixed, the troublesome manual gluing work required in the past is no longer necessary, and the workability can be significantly improved.

In addition, the insulating flange is adhesively fixed to the insulating rod at the same time as it is formed, and there is no adhesive layer between them, so there is no shortening of the creepage distance due to peeling of the adhesive, which is the case with conventional methods, and the quality can be improved. can.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a conventional insulator, FIG. 2 is a sectional view taken along line AA' in FIG. 1, and FIG. 3 is a longitudinal sectional side view of an insulator showing an embodiment of the present invention. , FIG. 4 is a longitudinal sectional side view showing an example of a molding device for molding an insulating flange;
FIG. 5 is a longitudinal sectional view showing another example of the molding apparatus. Explanation of symbols, 1... Insulating rod, 5... Molded insulating flange, 6a, 6b... Molding mold, 7.
...Insulation 7 lunge molding cavity, 8a, 8b, 9a,
9b...Mate type, 11a, 1lb...Elastic member for preventing outflow.

Claims (1)

[Claims] 1. An insulator in which a plurality of insulating flanges are fixed at predetermined intervals on an insulating bar to increase the creepage distance,
An insulator characterized in that the insulating flange is molded and fixed onto the insulating rod using resin. 2. In a molding device that molds and fixes a plurality of insulating flanges on an insulating rod with resin at predetermined intervals in order to increase the creepage distance, a plurality of molds that mold each of the insulating flanges separately, and each of these molding A molding device comprising: an intermediate mold that maintains a predetermined interval between the molds. 3. In a molding device that molds and fixes a plurality of insulating flanges with resin at predetermined intervals on an insulating rod in order to increase the creepage distance, the mold and the insulating rod are attached at least on one side of the insulating flange molding cavity of the mold. A molding device characterized in that an elastic member for preventing resin from flowing out is provided between the molding device and the molding device.