JPH076666Y2 - 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) Generally, a prefabricated rear end for a high-voltage CV cable has a pre-molded stress cone 1 of 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 semiconducting-side tapered surface 1a of the stress cone 1 at the tip, and a pressing metal fitting 41 having a flange at the rear end, and a predetermined interval with respect to the pressing metal fitting 41. Of the annular receiving metal fitting 42 arranged with a space between the receiving metal fitting 42 and the flange of the pressing metal fitting 41. A coil-shaped spring 44, which is loosely fitted to the outer circumference, is tightened with a bolt and a nut 6 toward the bottom of the epoxy insulator tube 5 fitted to the outer circumference of the pre-mold stress cone 1 to form a coil shape. The pre-mold stress cone 1 is pressed and fixed toward the tip of the cable by the elastic force of the spring 44. In the figure, 7
Is a protective metal member surrounding the pressing device 4, 8 is a semiconductive tape,
Reference numeral 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 end of the premolded 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 is the scale of the scale 11. The method of reading from 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-molded stress cone 1 may have to be inserted deeply into the epoxy insulator tube 5, and in such a case, the above work is more difficult to perform and accurate measurement is not possible. Virtually 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 metal fitting 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 pre-mold stress cone, and the flange portion of the pressing metal fitting is placed between the flange portion and the fixing metal fitting. 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 Reference part that has a stopper on the top surface that is inserted along the cable insulator until it reaches the rear end of the mold stress cone. And a support member having one end removably fixed to the flange of the push fitting or the outer periphery of the fixing fitting, and one end fixed to the support member and having a length scale display portion extending parallel to the cable and above the stopper. The scale display member and one end is slidably locked to the scale display member,
It is characterized in that the other end has on the cable side an abutting member extending to a position where it can be locked by the stopper of the reference member.

(Operation) The pre-mold stress cone insertion position measuring gauge of the present invention is arranged at a predetermined position of the cable end portion as described above, and then the contact member is arranged along the length direction of the scale display portion,
It is possible to know the insertion position of the pre-mold stress cone by sliding it until it comes in contact with the stopper of the reference member and reading the scale of the scale display member indicated by the contact member at this time. Therefore, the measurement is very simple and the scale can be read accurately and easily.

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

FIG. 1 is a side view showing an insertion position measuring gauge of a premolded stress cone according to an embodiment of the present invention.

As shown in the figure, in this embodiment, a long reference plate 12 arranged along a length direction on a cable insulator inside a pressing device of a cable connecting portion, which will be described later, and a length scale display. A long scale display plate 14 having a portion 13, an annular fixing metal fitting 16 for supporting and fixing one end of the scale display plate 14 to, for example, the outer periphery of the flange portion 15 of the pressing device, and the scale display portion 13 of the scale display plate 14. The main portion is composed of the contact plates 17 that are orthogonal to each other.

At a predetermined position on the upper surface of the reference plate 12, a convex portion 18 that comes into contact with the contact plate 17 is provided. FIG. 2 shows such a reference plate 12
It is the figure which showed from the upper surface.

Further, the scale display plate 14 is formed with a long hole 14a along the center line from almost the center to the right end in the figure, and the scale display portion 13 is formed along the long hole 14a near the upper edge thereof. ing. The contact plate 17 arranged orthogonally on the scale display section 13 is also provided with a long hole 17a along the center line from approximately the center to the upper end in the figure.
Insert the common bolt 19 into the long hole 14a of the 7a and the scale display plate 14, and with the bolt 19 loosened, move the scale display plate 14 and the contact plate 17 to any position within the range of the long holes 14a and 17a. It can be slid and fixed.

Further, an annular fixing metal fitting 16 for supporting and fixing the scale display plate 14
As shown in FIG. 3, a tightening portion 20 having a bolt insertion hole, which is divided into two and protrudes at each end, is placed opposite to each other, and these are tightened by bolts and wing nuts 21 from both sides, so that the pressing device The structure is such that it can be fitted onto the outer periphery of the flange portion 15. Further, a plurality of thin grooves 22 into which the scale display plate 14 can be fitted are formed in the outer peripheral surface so as to be arranged substantially evenly in the circumferential direction.

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. 4 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 presses the pressing metal fitting 41 and the annular receiving metal fitting 42. And a plurality of shafts 43 and coil springs that are evenly arranged in the circumferential direction
Since the main part is composed of 44 and 44, the structure is the same as that of the conventional device shown in FIG. 5, and therefore the same parts as those in FIG.

In order to carry out the measurement with the apparatus of this embodiment, first, the reference plate 12 is inserted inside the pressing device 4 from the rear thereof toward the pre-mold stress cone 1 with the length direction aligned with the cable length direction. Apply the tip to the rear edge of the pre-mold stress cone 1. On the other hand, the fixing metal fitting 16 is fitted on the outer periphery of the flange portion 15 of the pressing metal fitting 41 of the pressing device 4 so that one of the narrow grooves 22 is located on the reference plate 12. Next, each long hole 14 beforehand
The scale indicator plate 14 and the contact plate 17, which are held in a substantially L-shape by inserting the common bolt 19 into the a and 17a, are inserted from the gap between the coil springs 44 of the pressing device 4 into the contact plate 17. While being held vertically on the reference plate (12), the tip of the scale display plate (14) is fitted and fixed in the narrow groove (22) of the fixing metal fitting (16). After this, loosen the bolt 19 and set the scale display plate 14 to the reference plate 12.
The contact plate 17 is slid while holding it in parallel with the contacting edge of the contact plate 17 to the convex portion 18, where the length scale of the length scale display unit 13 intersects with the edge of the contact plate 17. Just read it.

As described above, the gauge for measuring the insertion position of the pre-mold stress cone of the present invention can know the insertion distance of the pre-mold stress cone very easily and with high accuracy. Can be inserted.

In the above embodiment, the contact plate 17 is configured to be inserted into the gap between the coiled springs 44 of the pressing device 4 for measurement, but the present invention is not limited to such an embodiment. Instead, the convex portion 18 for positioning the contact plate 17 is provided so as to be positioned to the right of the metal fitting 42 in the figure, and the contact plate 17 is brought into contact with this to read the scale. May be. Further, the fixing fitting 16 may be attached to the receiving fitting 42 instead of the pushing fitting 41.

[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]

FIG. 1 is a side view showing an embodiment of the present invention, and FIGS. 2 and 3 are a top view of a reference plate and a perspective view of a fixing member which constitute the embodiment shown in FIG. 1, respectively, and FIG. Is a cross-sectional view for explaining the method of using the embodiment, and FIG. 5 is a cross-sectional view for explaining the method for measuring the pre-mold stress cone insertion position in the conventional cable termination portion. 1 …… Pre-molded stress cone 3 …… Cable insulator 4 …… Pressing device 12 …… Reference plate 13 …… Length scale indicator 14 …… Scale indicator 14a …… Slot 15 …… Flange 16 …… Ring-shaped fixing bracket 17 …… Abutment plate 17a …… Slot 19 …… Bolt

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 configured to abut on a taper surface of the end and press 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 stopper that is inserted along the cable insulator inside the spring and the press fitting until reaching the rear end of the pre-mold stress cone serves as a reference point on the upper surface. A reference member having, and a supporting member whose one end is detachably fixed to the flange portion of the pressing fitting or the outer circumference of the fixing fitting, A scale display member having one end fixed to the support member and having a length scale display portion extending on the stopper in parallel with the cable, and one end slidably locked to the scale display member and the other end on the cable side. And a contact member extending to a position where it can be locked by the stopper of the reference member.