CN105207133A - Manufacturing method for 10 kV contraction type power cable intermediate joint - Google Patents

Abstract

The invention discloses a manufacturing process method for a 10kV cold-shrinkable power cable intermediate joint, which comprises the following steps: 1) stripping and cutting the outer sheath, armor and inner sheath; ;3) Stripping and cutting the copper shielding layer and the outer semi-conductive layer; 4) Stripping and cutting the insulating layer, and putting on the middle joint tube; 5) Crimping the connecting tube to determine the center; 6) Installing the middle joint tube; 7) Connecting the copper shielding layers at both ends ; 8) restore the inner sheath; 9) connect the armor layers at both ends; 10) restore the outer sheath. The process method of the present invention is instructive. During the production process of the 10kV cold-shrinkable power cable intermediate joint, the staff can be given clear processing steps, so that the produced intermediate joint has a high pass rate, avoids excessive waste, and saves costs. .

Description

10kV cold-shrinkable power cable intermediate joint manufacturing process

technical field

The invention relates to a manufacturing process of electric equipment, in particular to a manufacturing process method of an intermediate joint of a 10kV cold-shrinkable power cable.

Background technique

The production of 10kV cold-shrinkable power cable intermediate joints is completed only by the experience of the staff. The processing steps are chaotic and have no rules to follow, which often leads to a low pass rate of the output intermediate joints and a high scrap rate, resulting in waste and increased costs. .

Contents of the invention

The technical problem to be solved by the present invention is to provide a 10kV cold-shrinkable power cable intermediate joint manufacturing process with guidance and high yield of finished products.

In order to solve the problems of the technologies described above, the present invention comprises the following steps:

1) Stripping and cutting the outer sheath, armor and inner sheath;

2) The cable phase is separated, and the excess cable core is sawn off;

3) Stripping and cutting the copper shielding layer and the outer semiconducting layer;

4) Strip and cut the insulation layer, and set the intermediate joint pipe;

5) Crimp the connecting pipe to determine the center;

6) Install the intermediate joint pipe;

7) Connect the copper shielding layers at both ends;

8) Restore the inner sheath;

9) Connect the armor layers at both ends;

10) Restore the outer sheath.

The beneficial effects of the present invention are: the process method of the present invention is instructive, and in the production process of the 10kV cold-shrinkable power cable intermediate joint, the staff can be given clear processing steps, so that the produced intermediate joint has a high pass rate and avoids Excessive waste saves costs.

Detailed ways

The present invention is described in further detail below:

The manufacturing method of the 10kV cold-shrinkable power cable intermediate joint of the present invention comprises the following steps:

1. Stripping and cutting the outer sheath, armor and inner sheath:

(1) Stripping and cutting the outer sheath: It should be done twice to avoid loosening of the steel strip of the cable armor layer. Leave the outer sheath of the cable end for 100mm first. Then peel off the outer sheath according to the specified size, and the fracture is required to be flat.

(2) Sawing off the armor: Bind the copper wires on the armor according to the specified size or fix it with a clamp. The winding direction of the binding wire should be consistent with the winding direction of the armor, so that the armor will become tighter and tighter without loosening. Use Ф2.0mm copper wire for binding, 3-4 turns per track. When sawing off the armor, the depth of the circular saw marks should be uniform, and must not be sawed through to damage the inner sheath. When stripping the armor, the armor should be rolled off along the saw marks first, and then stripped to the cable end after the armor is broken.

(3) Stripping and cutting the inner sheath and packing: cut a ring mark horizontally with a knife at the place where the inner sheath should be stripped, and the depth should not exceed half of the thickness of the inner sheath. When stripping the inner sheath longitudinally, the knife incision should be between the two cores to prevent cutting the metal shielding layer. After peeling off the inner sheath, the end of the metal shielding tape should be fastened with polyvinyl chloride adhesive tape to prevent loosening. When cutting off the filler, the edge of the knife should face outward to prevent damage to the metal shielding layer.

2. Separate the cable phases and saw off the excess cable cores:

(1) The bending of the core should be done at the forked core of the cable. The bending should not be too large for easy operation, but it must be ensured that the bending radius meets the specified requirements to avoid deformation, wrinkling and damage of the copper shielding layer.

(2) When sawing off redundant cable core wires, the center size of the joint must be checked accurately. When sawing, the cable core ports should be kept straight.

3. Strip and cut copper shielding layer and outer semiconducting layer:

(1) When stripping and cutting the copper shield, it should be fastened with Ф1.0mm tinned copper binding wire or fixed with a constant force spring. When cutting, only one knife mark can be cut around, and it cannot be cut through, which will damage the outer semi-conductive layer. When stripping, it should be stripped at the knife mark, and stripped to the end of the core after disconnection.

(2) The fracture of the copper shielding layer should be cut flat, without sharp ends and burrs.

(3) After the outer semiconductive layer is peeled off, the insulating surface must be polished with fine sandpaper to remove the semiconductive particles embedded in the insulating surface.

(4) When cutting and grinding the slope at the end of the outer semiconductive layer, be careful not to damage the insulating layer. After grinding, the port of the outer semi-conductive layer should be flush, the slope should be flat and clean, and the transition with the insulating layer should be smooth.

4. Strip and cut the insulation layer, and set the intermediate joint pipe:

(1) When stripping and cutting the core insulation and inner semi-conductive layer, the core conductor must not be damaged. Stripping off the insulation layer should be carried out along the stranding direction of the wire core to prevent the wire core conductor from loosening.

(2) Use a knife or chamferer to chamfer the end of the insulation layer at an angle of 45 degrees. The sharp edge at the end of the core conductor should be filed off, cleaned and wrapped with PVC tape.

(3) The intermediate joint tube should be placed on the core at the longer end of the copper shielding of the cable. Before inserting, the insulating layer, outer semi-conductive layer, and copper shielding layer must be cleaned in sequence with cleaning paper. When inserting, attention should be paid to The protruding end of the plastic liner strip is inserted into the cable core first.

(4) Temporarily protect the intermediate joint pipe and cable insulation with plastic cloth to prevent bruises and dust from falling in, and keep the environment clean.

5. Crimp the connecting tube and determine the center:

(1) It is necessary to check in advance that the connecting pipe is consistent with the nominal cross-section of the cable core, and the crimping die and the standard size of the connecting pipe should match.

(2) When the connecting tube is crimped, the wire cores at both ends should be firm and not loose

(3) After crimping, the tip and burrs on the surface of the connecting pipe shall be smoothed and smoothed with a file and sandpaper, and the surface of the insulating layer and the surface of the connecting pipe must be cleaned with cleaning paper. Special attention should be paid not to leave metal powder or other conductive objects at the end of the intermediate joint.

6. Install the intermediate joint pipe:

(1) Evenly apply a thin layer of silicone grease on the surface of the installation area of the intermediate joint pipe, and after careful inspection, move the intermediate joint pipe to the center, and one end of it must be flush with the mark.

(2) When pulling out the liner strip, it should be carried out in a counterclockwise direction. The speed must be slow and uniform, so that the intermediate joint will naturally shrink. The cable is insulated and the outer semi-conductive shield has better interface contact.

7. Connect the copper shielding layer at both ends:

(1) The copper mesh belt should be wrapped flat and tightly in a half-lapped way. The two ends of the copper mesh are overlapped with the copper shielding layer of the cable. They must be tied tightly with copper binding wires and soldered firmly with tin. When fixed with a constant force spring, the constant force spring must be tightly fixed with an adhesive tape.

8. Restoring the inner sheath:

(1) The gap between the three-phase joints of the cables must be filled with fillers, and then the three phases of the cables should be tied together with PVC tape or white cloth tape to enhance the tightness and mechanical strength of the overall structure of the joints.

(2) Wrapping waterproof tape, when wrapping, stretch the tape to 3/4 of the original width. After completion, squeeze the wrapped tape with both hands to make it adhere tightly.

9. Connect the armor layers at both ends:

(1) When the two ends of the copper braid are connected to the armor layer, the surface of the steel armor must be polished with a file or sandpaper, and the end of the steel braid is slightly spread in the width direction, and the constant force spring is clipped and folded back. In the middle, tighten it firmly and wrap it tightly with PVC tape to increase the contact surface and stability between the copper braid and the steel armor.

10. Restoring the outer sheath:

(1) Wrapping waterproof tape, when wrapping, stretch the tape to 3/4 of the original width. After completion, squeeze the wrapped tape with both hands to make it adhere tightly. The waterproof tape shall cover 50mm of the outer sheath of the cable at both ends of the joint.

(2) Wrap two layers of armor tape on the waterproof tape of the outer sheath. The wrapping armor tape is wrapped in a semi-overlapping manner, must be fastened, and covers 70mm of the outer sheath at both ends of the joint.

(3) After 30 minutes, the cable connector can be moved to avoid damage to the outer sheath structure.

In summary, the content of the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can propose other embodiments within the technical guidance of the present invention, but these embodiments are all included in the scope of the present invention. within range.

Claims (1)

1. A method for manufacturing a 10kV cold-shrinkable power cable intermediate joint, characterized in that it comprises the following steps: 1) Stripping and cutting the outer sheath, armor and inner sheath; 2) The cable phase is separated, and the excess cable core is sawn off; 3) Stripping and cutting the copper shielding layer and the outer semiconducting layer; 4) Strip and cut the insulation layer, and set the intermediate joint pipe; 5) Crimp the connecting pipe to determine the center; 6) Install the intermediate joint pipe; 7) Connect the copper shielding layers at both ends; 8) Restore the inner sheath; 9) Connect the armor layers at both ends; 10) Restore the outer sheath.