Wedge-shaped retractor

Abstract

The invention discloses a wedge-shaped retractor, which comprises a wedge-shaped cavity, a wedge-shaped key, a retraction chain and a retraction hook. The tail part of the wedge-shaped cavity is connected with one end of the retraction chain. The other end of the retraction chain is connected with the retraction hook. The inner chamber of the wedge-shaped cavity corresponds to the wedge-shaped key. The wedge-shaped key is embedded into the wedge-shaped cavity to form a locking hole used for clamping metal wires. The locking hole comprises a first arc-shaped groove arranged at the bottom of the inner chamber of the wedge-shaped cavity. A second arc-shaped groove corresponding to the first arc-shaped groove is arranged at the bottom part of the wedge-shaped key. The first arc-shaped groove and the second arc-shaped groove form the locking hole. The invention has the advantages that the structure is simple, the wedge-shaped retractor can be manufactured by oneself, the cost is low, the contact area between a fixture and a metal wire is increased because the wedge-shaped and the wedge-shaped key jointly form annular clamping force which can tightly clamp the metal wire to be drawn, the problem that the metal wire is apt to be broken because the internal stress of the metal wire is excessively concentrated is solved, the intervention of a rotary swaging machine is not required, the equipment investment is decreased because the price of the rotary swaging machine is nine times higher than the price of a common roller dog, the consumption is reduced and the production cost is decreased.

Description

technical field [0001] The invention relates to a supporting traction device for the metal wire drawing industry, in particular to a traction device for drawing coated double metal wires. Background technique [0002] Usually, there is a certain distance between the wire drawing die and the pulling disc of the drawing machine during the wire drawing process, especially before the coated bimetallic wire is drawn, it is necessary to tie the lead wire through the head tie machine, when drawing a wire gauge with a diameter of 3mm or more , there will be obvious inconveniences, such as: using an ordinary roller-type head-tying machine, the length of the head-tying lead is about 200mm shorter, and the coated bimetallic wire is easy to cause skin damage before it is combined. The contact surface between the fixture and the drawing wire is small, resulting in local stress concentration, which can easily cause wire breakage. The cost of using ring forging head tying machine is high ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a wedge-shaped tractor, which can effectively solve the problem that if an ordinary roller-type tie-in machine is used in the existing wire drawing process, the lead-in wire of the tie-up is short, which easily leads to local stress concentration and breakage; For the ring forging machine, the cost is high and the maintenance is troublesome, time-consuming and consumable.

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