Classification Of Bolt Type Tension Clamps

bolted type strain clamp is used for connecting aluminum stranded wires or steel core aluminum stranded wires of small and medium cross-sections and steel stranded wires of overhead lightning arresters at positions that do not bear tension, and is also used for jumper connections of non-linear pole towers. Power engineering materials (metal fittings) are used to connect conductors to each other and are mainly used in power line projects.
dead end strain clamp Structure
bolted dead end clamp adopts a plate-plate structure and is made of aluminum alloy. The fastening pressure of the bolts is used to fix the connecting conductors in the upper and lower grooved clamps to complete the connection, and then the pressure is transmitted through flat washers and spring washers to provide a relatively uniform and constant pressure to the connecting conductors. It can be disassembled after installation and is often used at the jumper or ground wire overlap at the tension end of the line. In order to ensure that the wire clamp has sufficient and uniform pressure on the wire, the parallel groove wire clamp generally adopts a two-bolt or three-bolt structure, and the installation requires uniform force when tightening each bolt. Sometimes, in order to ensure operational reliability, two or three wire clamps are used in parallel connection at equal distances during line construction. The gripping force of the bolt-type parallel groove wire clamp on the conductor is about 10%-20% of the calculated breaking force of the conductor.
Bolt-type equal-diameter parallel groove wire clamps generally only connect conductors of the same diameter, and the allowed conductor span generally includes two adjacent specifications. For example, the JB-4 parallel groove wire clamp is suitable for conductor cross-sections of 185mm2 and 240mm2, so a symmetrical design is adopted in the structure.
Bolt-type different-diameter parallel groove wire clamps allow the span combination of conductors within a certain diameter range to be continuous. The structure adopts an asymmetric design, and the pressure plate is designed to be adjustable left and right to ensure that both different-diameter conductors can obtain a relatively stable pressure when in contact, but human factors have a greater impact on the tightness of the bolts.
Structure of wedge-type parallel groove wire clamps

The material of the wedge-type parallel groove wire is generally forged aluminum, consisting of an arched body and a wedge block; installation or removal uses a gun-shaped special tool, but it cannot be reused. The slope of the two sides of the wedge block is the same as that of the body, which can make the wire evenly stressed in the contact section and establish self-locking between materials; the arched body provides the elastic force required to maintain stable pressure. The radius of curvature of the inner groove of the arched body and the radius of the outer groove of the wedge block are slightly larger than the radius of the largest applicable wire. During installation, the two straight wires to be connected are placed in the corresponding positions on both sides of the body, and the wedge block is pushed to the mark line position by manpower, and then the gun-shaped special tool is fired to generate an instantaneous thrust to press the wedge block into the working position. The pressure on the wedge block is mainly determined by the amount of medicine in the special bullet, which reduces the influence of human factors on the installation quality, so the installation consistency of the wedge-type parallel groove wire clamp is better. The wedge-type parallel groove wire clamp can connect two wires of equal diameter and different diameters. The gripping force of the wedge-type parallel groove wire clamp on the wire is about 20%-45% of the calculated breaking force of the wire.

Structure of H-type parallel groove wire clamp
The H-type parallel groove wire clamp is a compression structure, made of pure aluminum or aluminum alloy, and cannot be disassembled after installation. The wire clamp is named because its cross-section resembles the letter H. With the help of special hydraulic pliers, the wire clamp and the two connected wires can be pressed into a whole. After crimping, the contact part is elliptical and has a relatively compact appearance. Similar to the wedge-type parallel groove wire clamp, its compression process is controlled by the output pressure of the hydraulic pliers, and is less affected by human factors. The H-type parallel groove wire clamp can connect two wires of equal diameter and different diameters. The span of the wires in the same groove is generally 3-4 specifications. When the H-type parallel groove wire clamp is connected to the wire, the aluminum on the inner wall of the wire clamp undergoes plastic deformation due to the circumferential force and is embedded in the twisted gap of the outer layer of the wire. The effective contact surface is larger, and the gripping force of the H-type parallel groove wire clamp on the wire is approximately 40%-65% of the calculated breaking force of the wire.