JPH0770266B2 - Insulator manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing an insulator in which a suspension insulator and the like and a metal fitting bonding portion are corrugated.

(Prior Art) For example, in the head of a suspension insulator, in order to enhance the bonding strength when cementing the cap fitting and the suspension pin to the outer surface and the inner surface of the main body made of porcelain, porcelain particles called sand are used. Are attached with a certain width by glaze. However, this sand has a high manufacturing cost, and it is not easy to apply a glazed sand to a specific part uniformly, and the sand may hinder the physical and electrical characteristics of the insulator. There were some problems left.

Therefore, as a result of the inventors of the present invention omitting such sanding, and as a result of studying a method for sufficiently maintaining the bonding strength with cement, they thought about a method of providing unevenness on the surface of the bonding surface of the metal fitting of the insulator itself. I arrived. However, if unevenness is created on the head of the suspended insulator by cutting in a post process after drying or firing, microcracks will remain on the cutting surface, and there is a risk of crack fracture due to the microcracks, and from the beginning It has been impossible to form both the inner and outer surfaces in a concavo-convex shape from the current insulator forming process.

(Problems to be Solved by the Invention) The present invention solves the conventional problems as described above, and the surface of the joint surface such as a metal fitting capable of sufficiently increasing the joint strength with cement without sanding. The present invention has been completed in order to provide a method for manufacturing an insulator in which unevenness is formed.

(Means for Solving the Problem) The present invention made in order to solve the above-mentioned problem is an uneven structure in which an undried insulator molded body is rotated while its outer surface and inner surface are supported to be swingable in the radial direction. The outer and inner molding trowels are pinched from both sides, and the outer molding trowel and inner molding trowel are oscillated while following the eccentricity of the porcelain insulator, while corrugating the metal fittings of the porcelain insulator. It is characterized by applying.

(Examples) The present invention will be described in detail below with reference to illustrated examples.
First, the structure of an apparatus for carrying out the present invention will be described.

In the figure, (1) is a frame, (2) is a rocker installed on the upper surface, and the undried insulator molded body G placed on the rocker (2) is rotated at a constant speed by a motor (3). be able to.

(4) is a vertical axis provided at a position apart from the rotation axis of the wheel (2). An outer surface processing arm (5) and an inner surface processing arm (6) are slidably attached to the vertical axis (4) at two positions above and below the vertical axis (4). As shown in FIGS. 2 and 3, the outer surface processing arm (5) has a pair of outer surface forming trowels (7) and (7) having an uneven inner surface, and a gear (8) for opening and closing the trowel.
(8) and a cylinder (1) with a rack (9) for rotating these gears (8), (8) in opposite directions by the same angle.
0). Therefore, by closing the outer surface molding irons (7), (7) around the head of the undried insulator molding G placed on the wheel (2), the outer surface molding irons (7), (7)
Can pinch the head of the insulator molded body G with an arbitrary force.
Further, since the outer surface processing arm (5) is supported so as to be freely swingable with respect to the vertical axis (4), the outer surface forming trowels (7) and (7) supported on the outer surface forming arm (5) are tentatively formed. Body G
Even if the head of is eccentric to the center of
Following this, an insulator molded body G centered on the vertical axis (4)
Can be freely swung in the radial direction. (11)
Is a cylinder for forcibly raising the outer surface processing arm (5).

On the other hand, the inner surface processing arm (6) is lifted by the cylinder (13) and is actuated by the ball (12) to move the vertical axis (4).
It can be swung around, and an inner surface molding iron (14) having an uneven outer surface is supported at the tip thereof. The inner surface processing arm (6) is spline-connected to the vertical shaft (4), and the slide torque arm (15) is spline-connected to the vertical shaft (4) at a position higher than the outer surface processing arm (5). It has a structure that swings while maintaining the same angular relationship. And this slide torque arm (1
A torque cylinder (17) as shown in FIG. 2 is provided between 5) and the arm (16) projecting from the outer surface processing arm (5), and the torque cylinder (17) is connected to the slide torque arm (15). A force is applied in the direction of separating it from the outer surface processing arm (5). As a result, a similar force acts between the inner surface processing arm (6) and the outer surface processing arm (5), and the inner surface processing arm (6) and the outer surface processing arm (5) center on the vertical axis (4). As a result, it is possible to freely swing in the radial direction.

(Operation) Next, the method of manufacturing the insulator of the present invention will be described together with the operation of the above-mentioned apparatus.

First, the undried insulator molded body G is locked as shown in the drawing (2).
Put on. Along with this, the inner surface processing arm (6) is raised by the cylinder (13) to position the inner surface forming iron (14) inside the head. Further, the outer surface processing arm (5) is lowered by the cylinder (11), the outer surface forming irons (7), (7) at the tip thereof are positioned outside the head, and the outer surface forming irons (7), (7) are lightly moved. close. As a result, as shown in the operating principle diagram of FIG. 5, the head portion of the undried insulator molding G is sandwiched from the outside by the outer surface molding irons (7) and (7) with a constant force.

Next, the insulator molded body G is rotated by the wheel (2),
Even if there is some eccentricity between the cap portion and the head portion of the insulator molded body G, the outer surface molding irons (7), (7) are supported so as to be swingable in the radial direction about the vertical axis (4). Therefore, it is possible to freely swing by following the amount of eccentricity.

In this state, if a force is applied between the inner surface processing arm (6) and the outer surface processing arm (5) by the torque cylinder (17),
As shown in the operating principle diagram of FIG. 5, the inner surface processing arm (6)
The inner surface forming iron (14) at the tip end of the core contacts the inner surface of the head of the insulator formed body G by the force generated by the torque cylinder (17), and the head has uneven outer surface forming iron (7) and inner surface forming iron (14). ) And will be pinched from both sides. As a result, the head portion of the insulator molded body G is plastically deformed, and corrugated in a concavo-convex shape over the entire inner and outer surfaces of the head portion. Moreover, since the inner surface molding iron (14) can freely swing together with the outer surface processing arm (5), it is not affected by the eccentricity of the insulator molded body G.

In the above embodiment, the corrugating process for the head portion of the suspension insulator was mainly described, but it goes without saying that the corrugating process for other portions can be performed in the same manner.

As described above, according to the present invention, the undried insulator molded body can be corrugated by rotating the undried insulator molded body while pressing the required portions from both sides with the uneven outer surface molding iron and inner surface molding iron. Unlike the cutting, the uneven portion formed on the insulator molded body in this manner has no risk of cracking, and the bonding force at the time of cement bonding can be enhanced without sanding.

(Effects of the Invention) As described above, according to the method of the present invention, it is possible to manufacture an insulator having unevenness on both inner and outer surfaces of a required portion such as a metal fitting adhering portion without cutting. Since the bonding force with cement can be increased without sanding the metal fitting bonding surface, the conventional problems associated with sanding can be eliminated. Further, according to the method of the present invention, corrugation can be performed while absorbing some eccentricity that is unavoidably generated in the insulator, so that workability can be improved.

Therefore, the present invention is extremely large in that it contributes to the development of industry as a method for manufacturing an insulator that eliminates the conventional problems.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, FIG. 2 is a side view of a main part, FIG. 3 is a plan view of an outer surface processing arm, FIG. 4 is a plan view of the main part, and FIG. The figure is a plan view showing the operating principle. (7): outer surface molding iron, (14): inner surface molding iron, G: insulator molding

Claims (1)

[Claims] 1. An undulating insulator molding body G is rotated to rotate the outer surface and the inner surface of the porcelain insulator body G in a swingable manner in the radial direction. The outer surface forming iron (7) and the inner surface forming iron (14) are oscillated while following the eccentricity of the insulator molded body G, and corrugated at the metal fitting bonding portion of the insulator molded body G. A method for manufacturing a characteristic insulator.