Manufacturing technology of cold-shrinkable cable head
1, peel off the outer sheath.
Straighten and wipe the cable. Peel off the outer sheath from the installation position to the terminal (the constant force spring can be temporarily wound around the cutting part of the outer sheath to facilitate peeling off the outer sheath).
2, sawing steel armor
Tie the steel armor temporarily along the steel armor with a constant force spring, then cut a ring-shaped deep mark along the winding direction of the steel armor (don't cut the second steel armor to prevent the cable from being hurt), pry it up with a screwdriver (the edge of the steel armor is broken), then pull down and loosen the steel armor with pliers, take off the steel armor belt, and deal with the burrs at the cut position. The whole process should be wrapped in steel armor, and the steel armor on the cable should not be loose.
3. Peel off the inner sheath: key point: prevent scratching the copper shield.
Leave 30mm steel armor and 10mm inner sheath, and wrap the steel armor with tie wire or PVC tape to prevent loosening. The copper shielding end is tightly wrapped with PVC tape to prevent the cold shrink sleeve from loosening and scratching.
4. Install steel armored grounding wire
Push the triangular cushion cone into the bifurcation of the cable to remove the paint and rust on the steel armor, and fix the steel armored ground wire on the steel armor with a large constant force spring. In order to fix it firmly, the ground wire should be reserved10 ~ 20 mm. After the constant force spring is wound once, the reserved part should be folded back and then wound with the constant force spring.
Step 5: Wrap the filling glue
From 50mm below the fracture to the whole constant force spring, steel armor and inner protective layer, two layers are wrapped with filling glue, and another layer is wrapped at the bifurcation, so that the cold-shrinkable finger sleeve is full and substantial. ?
6, fixed copper shield grounding wire
The grounding wire with one end divided into three strands is fixed on the three-phase copper shield with three small constant force springs respectively, and the springs are pushed inward as far as possible after winding. Separate the steel armored grounding wire from the copper shielded grounding wire, and do not short it.
7. Install cold-shrinkable three-core branch: (according to the requirements of cable accessories manual)
8. Set cold shrink sheath tube: (according to the requirements of the instruction manual of cable accessories)
A layer of black self-adhesive tape can be wrapped around the filling glue and the small constant force spring, so that the plastic strip in the cold shrink finger sleeve can be easily pulled out. Gently pull out the three small support tubes at the finger tip (aligned with the finger root when viewed from the inside), then put the finger sleeve in and press it down as far as possible, and pull out the plastic strip at the end counterclockwise. After cleaning the shielding layer, wrap PVC tape within the range of 100mm from the end of the finger sleeve, put the shrink sleeve on the root of the finger sleeve, and pull out the plastic tape counterclockwise. When drawing, hold the end of the cold-shrinkable tube by hand, and release it after positioning. Don't always hold the cold shrink tube, cut or lengthen the cold shrink tube or cut off the redundant wire core according to the distance from the end of the cold shrink tube to the terminal.
9. Peel off the copper shielding layer.
Mark the hue at the bifurcation of the cable core, and correctly measure the cutting position of the copper shield according to the instructions of the cable accessories (wrap it with PVC tape to prevent the copper shield from loosening), or tie the inside of the cutting position with copper wire, and draw a shallow mark along the copper wire to the fastening direction of the copper tape with a knife (be careful not to cut the semiconductor layer! ), slowly tear off the copper shielding tape, and finally untie the copper wire in the direction of tightening the copper tape.
10, peel off the outer semiconductive layer.
10-20mm copper belt fracture (subject to the size specified in the manual) is the fracture of the outer semi-conductive layer, and the fracture is marked with a circle of adhesive tape.
① Treatment method of strippable outer semiconductive layer
At the predetermined semi-conductive layer peeling and cutting place (outside the tape), draw a ring mark with a knife, draw two vertical marks from the ring mark to the end, with an interval of about 10 mm, and then tear off part of the strip-shaped semi-conductive layer from the end to the ring mark (note that the semi-conductive layer inside the ring mark cannot be pulled up! ), scratch with a knife should not damage the insulation layer, semi-conductive layer fracture should be neat. Check whether there are knife marks and residual semi-conductive materials on the surface of the main insulation layer, and clean them if there are.
(2) treatment method of non-strippable outer semi-conductive layer
Scrape the semi-conductive layer from the end of the core wire with glass (or use a special tool), and scrape a groove at the fracture, and the fracture should be neat. Semi-conductive materials should not be left on the surface of the main insulation layer, and the surface should be polished smooth with abrasive belt. (Most of the outer shielding layers of 35kV cables cannot be peeled off)
1 1. Install the terminal.
Measure the fixed position of the cable and the required length of each phase lead, and saw off the excess lead. Measure the length of the terminal crimping core wire, peel off the main insulation layer according to the size, and crimp the terminal. File off burrs and edges of terminal crimping, and clean them.
12, clean the surface of main insulation layer.
Wipe the dirt on the main insulation surface with a special cleaner. When cleaning, pay attention to wiping from the insulation end to the outer semi-conductive layer end, generally do not wipe in reverse, so as not to bring semi-conductive substances to the surface of the main insulation layer.
13. Install the cold-shrinkable cable termination tube.
Pack the gap and indentation of the terminal crimping part with filling glue. Sleeve the end of the cold-shrinkable tube into the cable core, aim at the limit line, and gently pull the support rod to shrink the cold-shrinkable tube.
14, sealed port
After shrinking, the semiconductor self-adhesive tape is wrapped at the ports of each phase cold shrink tube and cold shrink finger sleeve respectively. This can not only make the semiconductor layer outside the cold shrink tube contact well with the semiconductor shielding layer outside the cable, but also play an axial waterproof and moisture-proof role.
What is the manufacturing process of cold-shrinkable cable head, and what steps should be paid attention to? These small series have been introduced to you in detail above. The head of the cold-shrinkable cable head is relatively large in the relevant accessories of the cable, so it is very recognizable. The quality of cold-shrinkable cable head is very important. Only the cold-shrinkable cable head with good quality can have a good use experience and good use effect. Therefore, it is very necessary to master the cold shrinkage cable head.
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