JPH076667Y2 - Pre-molded stress cone insertion position measuring gauge - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention is a gauge for measuring the insertion position of a premolded stress cone for measuring the insertion position of a premolded stress cone at a prefabricated cable connection part. Regarding

(Prior Art) In general, a prefabricated rear end portion for a high-voltage CV cable has a pre-molded stress cone 1 having a substantially spindle shape, which is manufactured in advance in a factory or the like, as shown in FIG. The pre-mold stress cone 1 is inserted into the outer periphery of the insulator 3 and is pressed toward the tip of the cable by the pressing device 4 previously set on the outer periphery of the insulator 3 at a predetermined dielectric strength. Is configured to obtain.

The pressing device 4 has a cone-shaped expanding surface that abuts the semi-conductive side tapered surface 1a of the stress cone 1 at the tip, and a pressing metal fitting 41 having a flange portion at the rear end, and a predetermined fitting for the pressing metal fitting 41. An annular receiving metal fitting 42 arranged at a distance, a shaft 43 that freely penetrates the receiving metal fitting 42 and has its tip attached to the pressing metal fitting 41, and a shaft between the receiving metal fitting 42 and the flange portion of the pressing metal fitting 41. It consists of a coil-shaped spring 44 loosely fitted to the outer circumference of 43, and by tightening the receiving metal fitting 42 toward the bottom of the epoxy insulator tube 5 fitted to the outer circumference of the premold stress cone 1 with bolts and nuts 6, The premolded stress cone 1 is pressed and fixed toward the tip of the cable by the elastic force of the coiled spring 44. In the figure, 7 is a protective metal member surrounding the pressing device 4, 8 is a semiconductive tape, 9 is a cable shielding layer, and 10 is a cable sheath.

By the way, in such a cable terminating portion, the insertion position of the pre-mold stress cone 1 has a great influence on the characteristics, so that the pre-mold stress cone 1 is connected to the insulator 3.
It is very important that it is inserted in the proper position above in order to obtain good characteristics.

And, conventionally, in order to measure the insertion position of such a pre-molded stress cone, after assembling the connecting portion, a plate-shaped scale 11 that is generally used for measuring the length is inserted from between the coil-shaped springs 44. After arranging the cable insulator 3 along the length direction and applying one end to the rear end of the pre-molded stress cone 1, the distance from the member to be used as the reference of the insertion position, for example, the mounting position of the receiving metal fitting 42 to the scale 11 is set. The method of reading from the scale was taken.

(Problems to be Solved by the Invention) However, in the conventional cable terminating portion as described above, the premolded stress cone 1 of the pressing device 4 is used.
In order to secure a sufficient pressing force against the coil-shaped springs 44, a large number of coil-shaped springs 44 are evenly arranged in the circumferential direction.
The conventional method of reading the scale along the cable by inserting the scale 11 from between the coil-shaped springs 44 is small, and there is a problem that the operation is difficult and a reading error is likely to occur. Also, depending on the type of connection part, the pre-mold stress cone 1 should be inserted considerably deep into the epoxy insulator tube 5. With such a structure, the above work is more difficult to perform and it is practically impossible to perform accurate measurement. It was impossible.

Therefore, the present invention has been made in response to such a conventional problem, and the insertion position of the premolded stress cone can be accurately and easily measured, and as a result, a cable connection portion having excellent characteristics can be formed. An object of the present invention is to provide a gauge for pre-mold stress cone insertion position measurement that can be performed.

[Structure of the Invention] (Means for Solving the Problem) The gauge for measuring the pre-mold stress cone insertion position of the present invention inserts the pre-mold stress cone on the outer circumference of the insulator of the cable end and expands the cone shape at the tip. The front end of the pressing member having an open surface and having a flange portion at the rear end is brought into contact with the taper surface of the rear end of the premold stress cone, and the flange portion of the pressing member is placed between the flange portion and the fixing member. In a gauge for measuring the insertion position of the pre-molded stress cone at the cable connecting portion configured by pressing a plurality of springs along the outer circumference of the cable toward the distal end side, the inside of the spring and the press fitting is set to A fixed scale with a longitudinal guide groove that is inserted along the cable insulation until it reaches the rear end of the mold stress cone, The can contact stopper flange or mounting brackets push fitment is projected, it is characterized by comprising a slidable and removably mated Doshaku the guide groove on.

(Operation) The pre-mold stress cone insertion position measuring gauge of the present invention is arranged at a predetermined position of the cable end as described above, and then the stopper is gripped to move the moving scale in the length direction of the fixed scale. By sliding the stopper along the pushing metal fitting or the fixing metal fitting until it abuts and reading the scale of the fixed scale indicated by the dynamic scale at this time, the insertion position of the pre-mold stress cone can be known. Therefore, the measurement is very simple and the scale can be read accurately and easily.

(Embodiment) The present invention will be described below with reference to an embodiment shown in the drawings.

1 and 2 are a top view and a side view showing a gauge for measuring the insertion position of a pre-mold stress cone according to an embodiment of the present invention.

In these figures, 12 shows a fixed scale which is inserted along the cable insulator inside the pressing device as will be described later of the cable connecting portion, and extends along the center line from almost the center to the right end in the figure. A guide hole 13 is formed.
The long sides 13a, 1 facing each other in the length direction of the guide hole 13
A length scale 14 indicating the length from the left end in the figure of the fixed scale 12 is engraved in the vicinity of 3b.

A vernier scale 15 is slidably fitted in the guide hole 13, and a vernier scale 16 is engraved in the vicinity of the sliding contact surface with the guide hole 13.

Further, on the upper surface of the vernier scale 15 near the left end in the figure, a plate-shaped contact metal fitting 17 is provided so as to be vertically and detachably attached to the fixed scale 12.

Hereinafter, an example of how to use the gauge for measuring the insertion position of the pre-mold stress cone will be described with reference to the drawings.

FIG. 3 is a vertical cross-sectional view showing the main part of the cable end portion in which the premolded stress cone is inserted. The spindle-shaped premolded stress cone 1 is inserted in the outer periphery of the insulator 3 of the cable terminal 2. The pre-molded stress cone 1 is pressed toward the tip of the cable by a pressing device 4 which is set on the outer periphery of the insulator 3 behind the pre-molding stress cone 1, and the pressing device 4 includes the pressing metal fitting 41 and the annular receiving metal fitting. Since the main part is composed of 42, a large number of shafts 43 and coil-shaped springs 44 equally arranged in the circumferential direction, it is the same as the conventional cable terminating portion shown in FIG. Four
The same parts as those in the figure are designated by the same reference numerals and the duplicate description will be omitted.

To perform the measurement with the apparatus of this example, first, a fixed scale
12 is inserted inside the pressing device 4 from the rear toward the pre-mold stress cone 1 with the length direction aligned with the cable length direction, and the tip is applied to the rear end of the pre-mold stress cone 1. Next, the contact metal fitting 17 is inserted from the gap between the coil-shaped springs 44 of the pressing device 4 and attached to the upper surface of the vernier scale 15. After that, hold the tip of the contact metal fitting 17 and
Slide along the guide hole 13 until the abutting metal fitting 17 comes into contact with the end surface of the flange portion at the rear end of the pressing metal fitting 41.
It suffices to read the length scale 14 of the fixed scale 12 corresponding to the reading reference line. At this time, if necessary, more precise measurement can be performed using the vernier scale 16.

As described above, according to the pre-mold stress cone insertion position measuring gauge of the present invention, the insertion position of the pre-mold stress cone can be accurately and easily measured. Can be inserted.

In the above embodiment, the abutting metal fitting 17 is an example configured to be inserted from the gap between the coil-shaped springs 44 of the pressing device 4 and brought into contact with the flange portion at the rear end of the pressing metal fitting 41 for measurement. The present invention is not limited to such an embodiment, and is configured to be slidable at a position behind the metal fitting 42 of the vernier scale 15, that is, at a position on the right side in the figure, and the contact metal fitting 17 is attached to the metal fitting 42. You may make it contact and measure. However, in any case, it is desirable that the reading of the graduation can be performed behind the pressing device 4 and behind it.

[Advantage of Device] As described above, according to the pre-mold stress cone insertion position measuring gauge of the present invention, the insertion position of the pre-mold stress cone on the insulator can be accurately and easily measured. It is possible to form a cable connection with good characteristics.

[Brief description of drawings]

1 and 2 are a top view and a side view showing an embodiment of the present invention, FIG. 3 is a sectional view for explaining the usage of the embodiment, and FIG. 4 is a premold in a conventional cable terminating portion. It is sectional drawing explaining the method of measuring a stress cone insertion position. 1 …… Pre-molded stress cone 3 …… Cable insulator 4 …… Pressing device 12 …… Fixed scale 13 …… Guide hole 15 …… Vertical scale 17 …… Abutting bracket

Claims (1)

[Scope of utility model registration request] 1. A pre-molded stress cone is attached to the outer circumference of an insulator of a cable end, and the tip of a pressing member having a conical spreading surface at the tip and a flange portion at the rear end is attached to the end of the pre-molded stress cone. A cable connecting portion formed by abutting against the tapered surface of the end, and pressing the flange portion of the pressing fitting toward the tip side by a spring that is inserted between the flange portion and the fixing fitting along the outer circumference of the cable. In the gauge for measuring the insertion position of the pre-mold stress cone in, a guide groove in the length direction is inserted inside the spring and the press fitting along the cable insulator until reaching the rear end of the pre-mold stress cone. And a stopper that can come into contact with the flange portion of the pressing metal fitting or the fixing metal fitting on the upper surface, A pre-molded stress cone insertion position measuring gauge, characterized in that it comprises a movable scale that is slidably and detachably fitted.