Large-current electric tool switch

Abstract

The invention discloses a high-current electric tool switch, which structurally comprises a shell, a bracket terminal, a static contact piece terminal, a positive terminal, a reversing assembly, a trigger assembly, a conductive bridge, a reversing rod and the like, and is mainly characterized in that the conductive bridge is rotationally assembled on a conductive rod through arc contact; meanwhile, a quick on-off bulge is additionally arranged on the outer surface of the middle part of the conductive bridge, and elastic seats are arranged on the two sides of the conductive bridge for structural matching, so that quick on-off, rebound prevention and arc discharge prevention between the conductive bridge and the static contact piece terminal are realized; besides, reciprocating rotation of the reversing rod driving the reversing turntable in the reversing bottom shell is doubly positioned, so that looseness of the motor terminal caused by impact and vibration in actual use can be reduced, and the situations of arc ignition, heating melting deformation failure and the like during use of the reversing assembly can be avoided. Therefore, the use reliability of the large-current electric tool switch is better ensured, and the service life is prolonged.

Description

technical field [0001] The invention relates to an electric tool switch, in particular to a high-current electric tool switch. Background technique [0002] As the power demand of complete tools in the market is getting higher and higher, the current-carrying requirements for electric tool switches are also getting higher and higher. At present, electric tool switches are commonly used, due to current-carrying structure design and local heating and temperature rise. Adaptive current applications are limited. One is that the main switch structure design of the existing electric tool switch is mainly a tension spring structure and a bullet structure. The contact parts of the corresponding bracket terminals and conductive bridges are all formed by stamping process, resulting in the switch being closed or the switch being disconnected. During the process, it is easy to generate local concentrated heat in the contact area between the bracket terminal and the conductive bridge, a...

AI Technical Summary

Problems solved by technology

[0002] As the power demand of complete tools in the market is getting higher and higher, the current-carrying requirements for electric tool switches are also getting higher and higher. At present, electric tool switches are commonly used, due to current-carrying structure design and local heating and temperature rise. Adaptive current application is somewhat limited

One is that the main switch structure design of the existing electric tool switch is mainly a tension spring structure and a bullet structure. The contact parts of the corresponding bracket terminals and conductive bridges are all formed by stamping process, resulting in the switch being closed or the switch being disconnected. During the process, it is easy to generate local concentrated heat in the contact area between the bracket terminal and the conductive bridge, and the temperature rise of the switch is too high. Problems such as anti-bounce and anti-arcing make the contacts easier to ablate, stick and generate high temperature under the same power, and reduce the reliability of work and shorten the service life; the third is the reversing of the existing electric tool switch components, when a large current is applied and the reversing component is used as a current switch, the reversing component cannot be rotated and positioned effectively and quickly, resulting in easy arc ignition between the reversing tab and the motor terminal when the reversing component is used as a switch , which in turn leads to failure of the reversing component due to heating, melting, deformation; fourth, in the reversing component of the existing electric tool switch, the motor terminals are easily affected by shock and vibration during use and loosen, which will also cause the reversing component to generate arcs during use. and heating and melting deformation failure

At the same time, in addition to the above four main defects in use, the existing structure also has disadvantages such as complex assembly process, not easy to realize automatic production and relatively high cost.

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