Control circuit of electric percussion drill

Abstract

A control circuit for an electric impact drill, including an electric hammer body, a handle part, and a drill part. The drill part adopts a steel ball spring-type self-locking device, which includes a cylinder liner, a cylinder liner gasket that is sequentially sleeved on the cylinder liner, and a shrapnel The hoop spring, the spring, the chuck heart bone, the chuck rubber fixedly clamped to the end of the cylinder liner, the large chuck rubber set outside the chuck rubber and fixedly clamped to the chuck core bone; the cylinder liner is provided with a In the insertion hole of the drill bit, at least two axial oblong holes are arranged on the inner wall of the insertion hole, and locking steel balls are arranged in the oval oblong holes. The drill bit and the cylinder liner of the present invention have a large force-bearing contact surface, are not easy to wear, have small runout, stable rotation, and low noise, which improves the service life of the whole machine and the drill bit; the drill bit is disassembled quickly, reducing the safety of users working at high altitudes. The risk factor of regional operation; the structure design is compact and reasonable, and it is easy to use. At the same time, the working mode of the electric impact drill control circuit adjusts the gear position reasonably, and the failure rate is small.

Description

technical field [0001] The invention relates to an electric impact drill control circuit, in particular to a novel electric impact drill control circuit with a steel ball open spring type self-locking chuck device and a working mode adjustment gear. Background technique [0002] The chuck device of the drill bit of the electric hammer produced and used in the market is generally an internal key type round hole single ball positioning chuck device. The keyway is easy to wear and the gap becomes larger, which increases the beating range of the drill bit, which can easily lead to eccentricity of the whole machine, severe swinging, and the drill bit is easy to fall off; The deflection, the stability is difficult to guarantee, and the noise is also high in decibels; the above chuck device not only consumes energy and materials, but also has certain safety hazards. At the same time, most of the electric hammers produced and used in the market are single-function electric hammers,...

AI Technical Summary

Problems solved by technology

[0002] The chuck device of the drill bit of the electric hammer produced and used in the market is generally an internal key type round hole single ball positioning chuck device. The keyway is easy to wear and the gap becomes larger, which increases the beating range of the drill bit, which can easily lead to eccentricity of the whole machine, severe swinging, and the drill bit is easy to fall off; The deflection, the stability is difficult to guarantee, and the noise is also high in decibels; the above chuck device not only consumes energy materials, but also has certain safety hazards

At the same time, most of the electric hammers produced and used in the market are single-function electric hammers, and the working mode cannot be adjusted; a few electric hammers with selection mode, the position of the working mode adjustment gear is set on the side of the electric hammer body , due to the harsh working environment of the electric hammer, there are a lot of dust and suspended particles, these dirt are easy to seep into the electric hammer body through the gap of the adjustment gear, resulting in partial circuit short circuit or other mechanical failures

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