JPS5945163B2 - Light-weight suspension insulator and its manufacturing method - Google Patents

Description

[Detailed Description of the Invention] The present invention has been proposed to reduce the weight of a suspended BS chair, whose weight is a labor burden in high-voltage power transmission work, without any loss in electrical or mechanical performance. Lightweight suspension b that is less than one-third the weight of hard porcelain insulators.
This article relates to an insulator and its manufacturing method.

Conventional suspension insulators are made of hard porcelain sandwiched between a malleable cast iron cap and a steel pin bonded together with high-quality cement, and an appropriate number of insulators are used in series depending on the operating voltage. .

Both fittings are galvanized. However, the size of the suspension insulator is that the diameter of the porcelain part is 254 mm.
) weighs as much as 5.5 kg and uses high voltage.
Zero or more can be used in conjunction.

Having to carry and assemble such a heavy body to a high place on a telephone pole places a huge burden on workers. In addition, the porcelain part must be baked for a long time using a high-temperature furnace, and the slow cooling time is long, resulting in a high incidence of defective products.
This invention was invented to eliminate the drawbacks of the conventional hat, and the cap is molded using plastic with excellent electrical insulation, impact resistance, tensile strength, tracking resistance, temperature characteristics, etc. The insulator, which has a diameter of 254 m and 7 liters, is made from a special light alloy that has strength and hardness comparable to that of steel, and is anodized to ensure complete corrosion resistance. This makes it possible to reduce the weight by one-third to around 1.6 mm, greatly reducing the labor burden on mounting workers, shortening the manufacturing time of the hat, and eliminating the need for a high-temperature furnace.

Since the assembly of the shade, cap, and pin is completed in one step, the overall manufacturing time and steps can be reduced to about one-third of the conventional method. Other objects, configurations, and operational effects of the present invention will be explained with reference to the drawings.

Figure 1A is a front view of the completed insulator of this invention,
Figure B is its plan view.

1 is a cap, 4A is a dam on the outside of the molded resin groove 8 provided for the purpose of connecting the cap 2 to the cap 1VC and automatically determining the center position, and 4A is a dam on the outside of the dam 4A outside of 4B. Inner dams 5 arranged concentrically for the same purpose are two clevises provided in the cap 2 for connection, each with a pin shaft insertion hole 5A for connection with the pin 3.
This is a pin for connection like the clevis 2 that is opened.

A step portion 3A is provided on the head of the pin 3 to tightly connect the cap 1 and the pin 3 using the casting resin P. Fig. 2 is a longitudinal sectional front view of the completed invention, in which 6 is a deep fold provided inside the shade 1 to improve electrical dielectric strength, and a total of 3 folds are formed in concentric circles.
I have a line.

7 is a cap 2 that fits into the groove 8 inside the dams 4A and 4B.
11 is a passage and filling space between the shade 1 and the cap 2, and 9 is a casting resin P provided in the upper part of the shade 1.
12A. 12B, 12C and 12D are passages and filling portions for the casting resin P provided on all sides of the upper part of the shade 1.

FIG. 4 is a back view of the shade 1, and 3 is a pin fixed in the recess 1A on the back side of the shade 1 with casting resin P. A step 3A is formed on the head of this pin 3 to pin It is designed to prevent the person from escaping from Kasa 1.

13 is an injection port for casting resin P of the shade 1.

5A and 5B show a longitudinal sectional front view and a bottom view of the cap, in which the lower surface of the cap 2 forms a protrusion 7 that fits into the resin injection groove 8 of the cap 1; When fitting the cap 2 to the shade 1, remove the protrusion 7 from the dam 4A and 4BVC.
is guided and housed in the groove 8.

FIG. 6 is a perspective view of the coupling pin that is coupled to the cap 1, and the head portion is a stepped portion 3A, and the top surface has a passage 9 of the cap.
A recess 3C is formed to accommodate the injected resin that has flowed further,
A pin shaft insertion hole 3B is provided at the lower end.

FIG. 7 is an enlarged cross-sectional view showing the parts of the cap, cap, and pin of the present invention in which resin is injected. By curing the resin, the primary fixation between the hat and the cap is performed.

In this process, the cap 2 is automatically fixed coaxially on the center line of the shade 1. The cap 1 is made of, for example, a mixture of polycarbonate, polyethylene, and glass fiber, and the cap 2 and pins 3 are made of a special light alloy and galvanized. Next, when connecting the pin 3 to these joints, invert the pin 3 with the cap 2 facing down and the cap facing up, and inject resin from the injection resin inlet 13. The injected resin will never leak due to the hardening of the resin. The blank area other than the hatched area in FIG. 7 is filled with resin, and the shade 1, cap 2, and pin 3 are molded, hardened, and bonded together in one final step to complete the process.
As mentioned above, this invention eliminates the need for firing in a high-temperature furnace and the time required for cooling by molding the hat from plastic, which has strength and hardness, and the hat and pins are made of light alloy. , the overall weight can be reduced to about one third of that of the conventional one.

In addition, since it is lightweight, it is convenient to install it at a high place such as a utility pole, which significantly reduces the burden on the operator, and it is highly durable, making it possible to reduce costs. In addition, the back side is provided with deep folds, the upper surface is provided with a dam surrounding a groove that fits the joint part of the cap, and the upper part is provided with a hole that serves as a passage for the casting resin and a filling part during combination jointing, and a hole for the same purpose on the side surface. Since the hat has a main body with holes, when the hat is inverted and the casting resin is injected, the resin quickly passes through the passage from the central recess of the hat and fills the filling part between the hat and the cap. By providing a dam surrounding the groove on the outer periphery of the upper surface of the cap, a space for resin filling can be easily formed between the cap and the cap by simply fitting the protrusion at the tip of the cap into the dam. can. In addition, by forming a step above the connecting pin, when the casting resin is injected into the inlet of the hat and solidified, the connecting pin will not escape from the hat, and the hat, cap, and pin can be connected in one go. The solid casting resin that is injected and solidified through the resin injection work can be firmly bonded, which has great effects such as simplifying the assembly work.

[Brief explanation of drawings]

Figures 1A and 1B are a front view and a plan view of the entire invention, Figure 2 is a longitudinal sectional front view of the same, and Figures 3A and 3.
Figure B is a longitudinal enlarged front view and a plan view of the cap, Figure 4 is a bottom view of the hat, Figures 5A and 5B are a vertical sectional front diagram and bottom view of the cap, and Figure 6 is a pin. The perspective view and FIG. 7 are partially enlarged sectional views showing the passage of the injected resin. 1... Cap, 2... Cap, 3... Pin, 3A.
...Step, 3B...Groove, 4A, 4B...Weir, 5.
... Clevis, 5A... Hole, 6... Deep fold, 7...
Lower protrusion, 8...Groove, 9...Resin filling part and passage hole, 11...Resin filling space, 12A, 12B
, 12C, 12D . . . Resin filling portion and passage hole.

Claims (1)

[Scope of Claims] 1. Molded from plastic, provided with deep folds on the back surface, and provided with a dam surrounding a groove on the outer periphery of the top surface that fits into the joint portion of the cap,
It is light and has a cap on the top that forms a main body with holes that serve as passages and filling parts for the casting resin when combined together, and holes for the same purpose on the side, and a protrusion that fits into the groove between the dam of the cap. It consists of a cap made of an alloy, and a connecting pin made of a light alloy and having a stepped portion on the upper side, which is housed in a recess on the lower surface of the hat.
A lightweight suspension insulator characterized in that the shade, the cap, and the connecting pins are jointly molded by injecting a casting resin between the hat and the cap, the hole, the recess on the lower surface of the hat, and the connecting pin. . 2 Molded from plastic, provided with deep folds on the back side, and provided with a dam surrounding a groove that fits the joint part of the cap on the outer periphery of the top surface,
and an inverted hat, which has a main body with holes for the passage and filling part of the casting resin when combined and joined together on the upper part, and holes for the same purpose on the side, and has a protruding part that fits into the groove between the dams of the hat. The protruding part of the cap made of light alloy is fitted into the groove between the dams and bonded with adhesive to create an arcuate passage for casting resin and a filling space between the central protruding part of the shade and the lower recessed part of the cap. A pin made of a light alloy is inserted into the central recessed part of the hat with a gap left, and molding resin is injected from the central recessed part, and the filling space is filled with the resin through the hole. A method for manufacturing lightweight suspension insulators characterized by joint molding.