JP4956478B2 - Method and apparatus for dismantling conductor compression connection - Google Patents

Description

  The present invention relates to a method for disassembling a conductor compression connecting portion and a disassembling apparatus used therefor.

  For example, when connecting CV cables for distribution lines in a straight line, the conductors of both cables are compressed and connected by sleeves (conductor connection pipes), and the rubber unit (insulating cylinder) is placed on the outside so as to straddle the insulators of both cables. And a cable connecting portion is formed by covering a waterproof tube (or winding a waterproof tape) on the outer side of the protective sheath of both cables (see Patent Document 1). The rubber unit and the waterproof tube are inserted through the outer periphery of either cable before compressing and connecting the conductors.

  When any trouble occurs in the cable connection portion formed as described above, it is necessary to disassemble the connection portion and reconnect it. When disassembling the cable connection portion, the waterproof tube is torn and removed, the rubber unit is torn and removed, and the sleeve to which the conductor is compression-connected is not torn, so it is removed by cutting the conductor at both ends of the sleeve. .

JP 2002-305838 A

  However, if the cable connection part is disassembled as described above, the conductor will be shortened by the length of the sleeve. Therefore, if the cable does not have the extra length necessary for reconnection, it will be necessary to replace the cable. A great loss occurs both in terms of time and cost.

  In view of the above problems, an object of the present invention is to provide a method for disassembling a conductor compression connection portion that can dismantle a conductor compression connection portion without cutting the conductor, and a disassembly device used therefor.

A method for disassembling a conductor compression connection part according to the present invention includes:
A receiving die having a concave portion for positioning a sleeve to which a conductor is compression-connected, and a V groove formed in a longitudinal direction in a circumferential central portion of a surface of the sleeve positioned on the receiving die opposite to the receiving die. With a groove forming blade,
The depth of the concave portion of the receiving die is determined when the sleeve having two V grooves formed on the outer periphery at intervals of approximately 120 ° is positioned on the receiving die with the two V grooves facing the concave portion. In addition, the two V-grooves are located in the recess , and the edges on both sides of the recess of the receiving die are the first V-groove and the second V-groove that are the two V-grooves and the vicinity thereof. Set it so that it is located in the middle of the diagonal part across the center of the sleeve ,
A sleeve to which a conductor is compression-connected is set and positioned in the recess of the receiving die, and the V-groove forming blade is press-fitted into the sleeve so that a thin portion remains between the blade edge and the conductor, and the length of the sleeve Forming a first V-groove in the direction;
The sleeve formed with the first V-groove is set and positioned in the recess of the receiving die so that a position approximately 120 ° away from the first V-groove in the circumferential direction faces the V-groove forming blade, Pressing the V-groove forming blade into the sleeve so that a thin portion remains between the blade edge and the conductor, and forming a second V-groove in the longitudinal direction of the sleeve;
The sleeve formed with the first and second V-grooves is formed in the recess of the receiving die so that a position approximately 120 ° away from the first and second V-grooves in the circumferential direction faces the V-groove forming blade. After setting and positioning, the V-groove forming blade was press-fitted into the sleeve so that a thin portion remained between the blade edge and the conductor, and a third V-groove was formed in the longitudinal direction of the sleeve. rear,
If cracks have occurred in the thin portions of at least two V grooves at the stage of forming the third V groove, and if no cracks have occurred in the thin portions of at least two V grooves, When the V-groove forming blade is further press-fitted into any one of the first to third V-grooves and the thin portions of at least two V-grooves are cracked, three sleeves or It is characterized by being divided and removed in two.

Moreover, the method for disassembling the conductor compression connection part according to the present invention is as follows.
Before the step of forming the first V-groove, the sleeve is compressed connecting conductor may have a step of cutting to the end face of the conductor is exposed.

  In the method for disassembling a conductor compression connection portion according to the present invention, the sleeve to which the conductor is compression-connected is compressed into a hexagonal cross section, and the first to third V grooves correspond to sides of the hexagonal cross section, respectively. It is preferable to form in the center part of a plane part.

Moreover, the dismantling device for the conductor compression connection part according to the present invention is:
A receiving die having a concave portion for positioning a sleeve to which a conductor is compression-connected, and a V groove formed in a longitudinal direction in a circumferential central portion of a surface of the sleeve positioned on the receiving die opposite to the receiving die. A groove forming blade and a frame formed in a shape in which both end portions face each other,
The receiving die is attached to one end side of the frame with the recess facing the other end side, and the V-groove forming blade is advanced and retracted toward the receiving die by a pressurizing mechanism provided on the other end side of the frame. It is attached so that it can
The depth of the concave portion of the receiving die is determined when the sleeve having two V grooves formed on the outer periphery at intervals of approximately 120 ° is positioned on the receiving die with the two V grooves facing the concave portion. In addition, the two V-grooves are set in the recess and a circumferential surface larger than a half circumference of the sleeve is positioned outside the recess ,
A sleeve to which a conductor is compression-connected is set and positioned in the recess of the receiving die, and the V-groove forming blade is press-fitted into the sleeve so that a thin portion remains between the blade edge and the conductor, and the length of the sleeve Forming a first V-groove in the direction,
The sleeve formed with the first V-groove is set and positioned in the recess of the receiving die so that a position approximately 120 ° away from the first V-groove in the circumferential direction faces the V-groove forming blade, Press-fitting the V-groove forming blade into the sleeve so that a thin portion remains between the blade edge and the conductor, forming a second V-groove in the longitudinal direction of the sleeve,
The sleeve formed with the first and second V-grooves is formed in the recess of the receiving die so that a position approximately 120 ° away from the first and second V-grooves in the circumferential direction faces the V-groove forming blade. Set and positioned, press-fitting the V-groove forming blade into the sleeve so that a thin portion remains between the blade edge and the conductor, forming a third V-groove in the longitudinal direction of the sleeve,
The sleeve is removed by dividing it into three or two in the circumferential direction at the stage where the thin portions of at least two V grooves are cracked .

  In the disassembling apparatus for a conductor compression connection part according to the present invention, when the V-groove forming blade is press-fitted into the sleeve on both sides of the receiving die and the V-groove forming blade, the cutting edge of the V-groove forming blade contacts the conductor. It is preferable that an abutting surface is provided to abut against each other leaving a thin portion at the bottom of the V groove and prevent further press-fitting of the V groove forming blade.

  According to the present invention, V-grooves that do not reach the conductor are formed at intervals of approximately 120 ° in the sleeve to which the conductors are compression-connected, and cracks are generated in the thin portion at the bottom of the V-groove, so that Alternatively, since the two parts are removed, the conductor in the sleeve can be exposed without cutting the conductor. Therefore, since the exposed conductor can be inserted into a new sleeve and reconnected, the cable can be reconnected even when the cable has no extra length.

  FIG. 1 shows an embodiment of a method for disassembling a conductor compression connection according to the present invention. In the figure, 1 is a conductor such as a CV cable, 2 is an insulator, and 3 is a sleeve in which conductors 1 and 1 are compression-connected. FIG. 1A shows a state in which the conductor compression connection portion is exposed by removing the waterproof tube, the rubber unit, and the like because some trouble has occurred in the cable connection portion. Conventionally, after this, the sleeve 3 is removed by cutting the conductors 1 and 1 at both ends of the sleeve 3, but in this embodiment, first, the sleeve 3 is first moved to the longitudinal center (conductors 1, 1). 1), and is separated into two in the longitudinal direction as shown in FIG. At this stage, the end faces of the conductors 1 and 1 are exposed at the cut surface of the sleeve 3.

  When a wall (stopper) against which the end faces of the conductors 1 and 1 abut is formed inside the sleeve 3, the sleeve 3 is cut at positions corresponding to both sides of the walls so that the end faces of the conductors 1 and 1 are formed. Expose it.

  Thereafter, the following operations are performed on the sleeves 3 and 3 separated into two parts. First, as shown in FIG. 1C, after the sleeve 3 is received and set on the die 4 and positioned, a V-groove forming blade 5 is press-fitted into the sleeve 3 from the opposite side, and the first in the longitudinal direction of the sleeve 3. The V-groove 6A is formed. Since the sleeve 3 is usually compressed into a hexagonal cross section, the V-groove 6A is preferably formed at the center of the flat surface corresponding to the side of the hexagonal cross section. The press-fitting depth of the V-groove forming blade 5 is set so that the thin portion 3 a remains between the cutting edge of the V-groove forming blade 5 and the conductor 1. This is to prevent the V-groove forming blade 5 from damaging the conductor 1 and to make it easier for cracks to enter the thin portion 3a in a later step.

  Next, the receiving die 4 and the V-groove forming blade 5 are rotated about 120 ° around the sleeve 3, and the sleeve 3 is set on the receiving die 4 and positioned as shown in FIG. Similarly, the V-groove forming blade 5 is press-fitted into the sleeve 3 to form the second V-groove 6B at a position approximately 120 ° away from the first V-groove 6A in the circumferential direction. Also at this time, the thin portion 3 b remains between the blade edge of the V-groove forming blade 5 and the conductor 1.

  Next, the receiving die 4 and the V-groove forming blade 5 are further rotated by approximately 120 ° around the sleeve 3, and the sleeve 3 is set on the receiving die 4 and positioned as shown in FIG. Similarly, the V-groove forming blade 5 is press-fitted into the sleeve 3 to form the third V-groove 6C at a position approximately 120 ° away from the first and second V-grooves 6a and 6b in the circumferential direction. Also at this time, the thin portion 3 b remains between the blade edge of the V-groove forming blade 5 and the conductor 1.

  When the third V-groove 6C is formed, the first and second V-grooves 6A and 6B are already formed. Therefore, the sleeve 3 is deformed so as to open to both sides of the V-groove forming blade 5. At the same time, the thin portions 3a and 3b are bent so that the opening angles of the first and second V grooves 6A and 6B become small, so that the thin portions 3a to 3c are cracked.

  Therefore, if the receiving die 4 and the V-groove forming blade 5 are opened, the sleeve 3 can be divided into three parts in the circumferential direction and removed as shown in FIG. Since the conductor 1 exposed by removing the sleeve 3 remains in its original length, it can be inserted into a new sleeve and reconnected. Of course, in the case of connection of a CV cable or the like, reconnection of the exposed conductor is performed after a rubber unit and a waterproof tube are inserted through the outer periphery of one of the cables.

  As shown in FIG. 1E, when no cracks are formed in the thin portions 3a to 3c when the third V-groove 6C is formed, the V-groove formation of FIGS. The blade press-fitting operation may be repeated until the thin portions 3a to 3c are cracked. The order of the press-fitting work does not need to be (C) to (E), and is arbitrary.

  Further, at the stage where the third V-groove 6C is formed (or in the subsequent press-fitting operation), the thin portions 3a to 3c are not cracked at the same time, and two thin portions 3a as shown in FIG. In some cases, only 3c (or only 3b, 3c or only 3a, 3b) is cracked. At this time, as shown in FIG. 2B, the sleeve 3 is opened by folding the thin portion 3b that is not cracked, and the sleeve 3 is divided into two in the circumferential direction and removed.

  By the way, in order to generate cracks in the thin portions 3a to 3c at the stage where the third V-groove 6C is formed, the depth of the recess (the portion in contact with the outer peripheral surface of the sleeve 3) for positioning the sleeve 3 of the receiving die 4 is increased. It is important to set the size appropriately.

  For example, as shown in FIG. 3A, the depth of the recess 4a for positioning the sleeve 3 of the receiving die 4 is shallow, and the first and second V grooves 6A when forming the third V groove 6C, In a state where 6B is located outside the recess 4a, the sleeve 3 and the conductor 1 are crushed together when the V-groove forming blade 5 is press-fitted to form the third V-groove 6C (the broken line is the V-groove). The state before press-fitting the forming blade 5), the bottom portion of the third V-groove 6 cannot be made sufficiently thin, so that the portion cannot be cracked.

  Further, as shown in FIG. 3C, in the state where the recess 4a of the receiving die 4 is deep and the half circumference of the sleeve 3 is located in the recess 4a, the third V-groove 6C is formed. When the V-groove forming blade 5 is press-fitted, it is difficult for the sleeve 3 to escape to both sides, so it is difficult to generate cracks in the thin portions 3a and 3b at the bottom of the first and second V-grooves 6A and 6B.

  On the other hand, as shown in FIG. 3 (B), the depth of the recess 4a of the receiving die 4 is set, the sleeve 3 formed with the first and second V grooves 6A and 6B is formed, and the third V groove is formed. Therefore, the first and second V-grooves 6A and 6B are positioned in the recess 4a when positioned in the recess 4a, and the circumferential surface larger than the half circumference of the sleeve 3 is positioned outside the recess 4a (the recess In order to form the third V-groove 6C, the edges on both sides of 4a are set so that the edges of the V-grooves 6A and 6B and the diagonal portions P and Q sandwiching the sleeve center in the vicinity thereof are set. When the V-groove forming blade 5 is press-fitted into the sleeve, the sleeve 3 opens to both sides with the edge of the concave portion 4a as a fulcrum (the first and second V-grooves 6A and 6B are narrowed). It is possible to generate the cracks in the thin portions 3a to 3b at the bottom of the V grooves 6A to 6C.

  In order to generate cracks in the thin portions 3a to 3c when the third V groove 6C is formed, the stroke of the V groove forming blade 5 is set so that the thickness of the thin portion is as thin as possible. However, since the conductor 1 may be damaged if it is set too thin, the thickness of the thin portion is preferably set to about 0.25 to 2 mm depending on the size of the sleeve. Moreover, it is preferable to set the angle of the blade edge of the V-groove forming blade 5 to about 34 °.

  Next, an embodiment of a disassembling apparatus used in the method for disassembling a conductor compression connecting portion according to the present invention will be described with reference to FIGS. 4 and 5. In the figure, 1 is a conductor such as a CV cable, 2 is also an insulator, 3 is a sleeve compression-connected to the conductor 1 (cut as shown in FIG. 1B), 4 is a receiving die, and 5 is a V groove. A forming blade 7 is a frame.

  The receiving die 4 has the recess 4a for positioning the sleeve 3 as described above. The V groove forming blade 5 forms a V groove in the longitudinal direction of the sleeve 3 positioned on the receiving die 4 as described above. The frame 7 is formed in a substantially U shape so that both ends thereof are opposed to each other. The receiving die 4 is attached to one end side of the frame 7 with the concave portion 4a facing the other end side. A pressure mechanism comprising a hydraulic cylinder 8 and a piston 9 is provided on the other end side of the frame 7, and the V-groove forming blade 5 is attached to the tip of the piston 9 while being held by a holder 10. A hydraulic pressure source 11 is connected to the hydraulic cylinder 8 via piping, a switching valve, and the like. The piston 9 moves forward when hydraulic pressure is supplied from the hydraulic power source 11, and moves backward by a tension spring (not shown) incorporated therein when the hydraulic pressure is released. As a result, the V-groove forming blade 5 can move forward and backward toward the receiving die 4.

  FIG. 4 shows a state in which the V-groove forming blade 5 is retracted and the sleeve 3 is received and set in the recess 4 a of the die 4. A positioning mark 12 indicating the position of the sleeve 3 in the axial direction is attached to the outer surface of the receiving die 4. FIG. 5 shows a state where the V-groove forming blade 5 is advanced from the state of FIG. 4 and the V-groove forming blade 5 is press-fitted into the sleeve 3. The lengths of the receiving die 4 and the V groove forming blade 5 are set longer than the sleeve 3 so that the V groove can be formed in the entire length of the sleeve 3 by one press-fitting operation.

  Further, as described with reference to FIG. 3B, the depth of the recess 4a of the receiving die 4 is the same as that of the sleeve 3 in which two V grooves 6A and 6B are formed on the outer periphery at intervals of approximately 120 °. When the V-grooves 6A and 6B are positioned on the receiving die 4 toward the concave portion 4a, the two V-grooves 6A and 6B are positioned in the concave portion 4a and have a circumference larger than a half circumference of the sleeve 3. The surface is set to be located outside the recess 4a. In this way, as described above, when the V-groove forming blade 5 is press-fitted to form the third V-groove 6C, the thin portion 3a at the bottom of the first to third V-grooves 6A to 6C. A crack can be generated almost certainly in 3b.

  In addition, abutting surfaces 13 are formed on both sides of the recess 4a of the receiving die 4, and abutting surfaces 14 are also formed on both sides of the holder 10 that holds the V-groove forming blade 5 so as to be opposed thereto. These abutting surfaces 13, 14 are arranged so that when the V-groove forming blade 5 is press-fitted into the sleeve 3, the thin-walled portion remains at the bottom of the V-groove before the cutting edge of the V-groove forming blade 5 contacts the conductor 1. At the end, it functions to prevent further press-fitting of the V-groove forming blade 5. In this case, since the cutting edge of the V-groove forming blade 5 does not come into contact with the conductor 1, the conductor 1 is less likely to be damaged, and the thickness of the thin portion at the bottom of the V-groove can be made substantially constant. When the third V groove 6A is formed, the thin portions 3a to 3b can be cracked almost certainly.

  In the above embodiment, the case where the disassembling operation is performed after the sleeve to which the conductor is compression-connected is separated into two in the longitudinal direction has been described, but when the length of the sleeve is short, 2 in the longitudinal direction. The dismantling work can be performed as it is without separating it into two.

  In the above-described embodiment, the case where the sleeve is compressed into a hexagonal cross section has been described. However, the present invention can be similarly applied even when the sleeve is compressed into a circular cross section.

(A)-(F) is explanatory drawing which shows one Embodiment of the disassembly method of the conductor compression connection part which concerns on this invention in order of a process. (A), (B) is explanatory drawing corresponding to FIG.1 (E), (F) which shows other embodiment of the disassembly method of the conductor compression connection part which concerns on this invention. Explanatory drawing which shows the case where the depth of the recessed part of a receiving die is too shallow (A), (B) is appropriate, and (C) is too deep. BRIEF DESCRIPTION OF THE DRAWINGS (A) which shows one Embodiment of the conductor compression connection part disassembly apparatus which concerns on this invention in the state before press-fitting a V-groove formation blade in a sleeve is a front view, (B) is a bottom view. Similarly, (A) shows a state after press-fitting a V-groove forming blade into a sleeve, and (B) is a bottom view.

Explanation of symbols

1: conductor, 2: insulator, 3: sleeve, 3a, 3b, 3c: thin portion,
4: receiving die, 4a: recess, 5: V groove forming blade, 6A, 6B, 6C: V groove,
7: frame, 8: hydraulic cylinder, 9: piston, 10: holder,
11: Hydraulic source, 12: Positioning mark, 13, 14: Abutting surface.

Claims (5)

A receiving die having a concave portion for positioning a sleeve to which a conductor is compression-connected, and a V groove formed in a longitudinal direction in a circumferential central portion of a surface of the sleeve positioned on the receiving die opposite to the receiving die. With a groove forming blade,
The depth of the concave portion of the receiving die is determined when the sleeve having two V grooves formed on the outer periphery at intervals of approximately 120 ° is positioned on the receiving die with the two V grooves facing the concave portion. In addition, the two V-grooves are located in the recess , and the edges on both sides of the recess of the receiving die are the first V-groove and the second V-groove that are the two V-grooves and the vicinity thereof. Set it so that it is located in the middle of the diagonal part across the center of the sleeve ,
A sleeve to which a conductor is compression-connected is set and positioned in the recess of the receiving die, and the V-groove forming blade is press-fitted into the sleeve so that a thin portion remains between the blade edge and the conductor, and the length of the sleeve Forming a first V-groove in the direction;
The sleeve formed with the first V-groove is set and positioned in the recess of the receiving die so that a position approximately 120 ° away from the first V-groove in the circumferential direction faces the V-groove forming blade, Pressing the V-groove forming blade into the sleeve so that a thin portion remains between the blade edge and the conductor, and forming a second V-groove in the longitudinal direction of the sleeve;
The sleeve formed with the first and second V-grooves is formed in the recess of the receiving die so that a position approximately 120 ° away from the first and second V-grooves in the circumferential direction faces the V-groove forming blade. After setting and positioning, the V-groove forming blade was press-fitted into the sleeve so that a thin portion remained between the blade edge and the conductor, and a third V-groove was formed in the longitudinal direction of the sleeve. rear,
If cracks have occurred in the thin portions of at least two V grooves at the stage of forming the third V groove, and if no cracks have occurred in the thin portions of at least two V grooves, When the V-groove forming blade is further press-fitted into any one of the first to third V-grooves and the thin portions of at least two V-grooves are cracked, three sleeves or A method of disassembling a conductor compression connecting portion, which is divided into two and removed.   2. The method for disassembling a conductor compression connecting portion according to claim 1, further comprising a step of cutting the sleeve to which the conductor is compression-connected so that the end face of the conductor is exposed before the step of forming the first V-groove. .   The sleeve to which the conductors are compression-connected is compressed into a hexagonal cross section, and each of the first to third V-grooves is formed at a central portion of a flat portion corresponding to a side of the hexagonal cross section. A method for disassembling a conductor compression connection part according to 1 or 2. A receiving die having a concave portion for positioning a sleeve to which a conductor is compression-connected, and a V groove formed in a longitudinal direction in a circumferential central portion of a surface of the sleeve positioned on the receiving die opposite to the receiving die. A groove forming blade and a frame formed in a shape in which both end portions face each other,
The receiving die is attached to one end side of the frame with the recess facing the other end side, and the V-groove forming blade is advanced and retracted toward the receiving die by a pressurizing mechanism provided on the other end side of the frame. It is attached so that it can
The depth of the concave portion of the receiving die is determined when the sleeve having two V grooves formed on the outer periphery at intervals of approximately 120 ° is positioned on the receiving die with the two V grooves facing the concave portion. In addition, the two V-grooves are located in the recess , and the edges on both sides of the recess of the receiving die are the first V-groove and the second V-groove that are the two V-grooves and the vicinity thereof. It is set to be located in the middle of the diagonal part across the sleeve center ,
A sleeve to which a conductor is compression-connected is set and positioned in the recess of the receiving die, and the V-groove forming blade is press-fitted into the sleeve so that a thin portion remains between the blade edge and the conductor, and the length of the sleeve Forming a first V-groove in the direction,
The sleeve formed with the first V-groove is set and positioned in the recess of the receiving die so that a position approximately 120 ° away from the first V-groove in the circumferential direction faces the V-groove forming blade, Press-fitting the V-groove forming blade into the sleeve so that a thin portion remains between the blade edge and the conductor, forming a second V-groove in the longitudinal direction of the sleeve,
The sleeve formed with the first and second V-grooves is formed in the recess of the receiving die so that a position approximately 120 ° away from the first and second V-grooves in the circumferential direction faces the V-groove forming blade. Set and positioned, press-fitting the V-groove forming blade into the sleeve so that a thin portion remains between the blade edge and the conductor, forming a third V-groove in the longitudinal direction of the sleeve,
An apparatus for disassembling a conductor compression connection , wherein the sleeve is removed by dividing it into three or two in the circumferential direction at the stage where a thin portion of at least two V-grooves is cracked .   On both sides of the receiving die and the V-groove forming blade, when the V-groove forming blade is press-fitted into the sleeve, the blade tip of the V-groove forming blade abuts each other leaving a thin portion at the bottom of the V-groove before contacting the conductor, The disassembling apparatus for a conductor compression connection part according to claim 4, further comprising an abutting surface for preventing further press-fitting of the V-groove forming blade.

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