Low-rpm drilling fixture with safety protection function

Abstract

The invention discloses a low-rpm drilling fixture with a safety protection function. The low-rpm drilling fixture with the safety protection function comprises an outer tooth shaft sleeve and an inner tooth shaft sleeve. The outer circumferential surface of the front end of the inner tooth shaft sleeve is connected with an adjusting nut. The front end of the outer tooth shaft sleeve is provided with a chuck. Outer teeth are arranged on the outer circumference of the rear end of the outer tooth shaft sleeve. The outer tooth shaft sleeve is sleeved with inner tooth friction plates. Inner teeth are arranged in the inner tooth shaft sleeve and are sleeved with outer tooth friction plates. The outer tooth friction plates and the inner tooth friction plates are located between a limiting end face of the outer tooth shaft sleeve and a limiting end face of the inner tooth shaft sleeve. When the outer tooth shaft sleeve and the inner tooth shaft sleeve squeeze each other, the outer tooth friction plates and the inner tooth friction plates are axially pressed tightly on the two limiting end faces. Through the structure, the inner tooth shaft sleeve is driven to press tightly or loosen the friction plates through the adjusting nut so that the friction moment between the outer tooth shaft sleeve and the inner tooth shaft sleeve can be increased or decreased, and the low-rpm drilling fixture can play roles in transmitting moment and carrying out overload safety protection. Consequently, current surges are completely avoided, and the phenomenon that a motor or a drill bit is damaged is prevented completely.

Description

[0001] technical field [0002] The invention relates to a jig for a drilling tool, in particular to a low-speed safety protection drilling jig. Background technique [0003] In the prior art, one end of the clamp on the drilling tool is connected to the power output shaft, and the other end is used to clamp the drill bit for drilling. Traditionally, the clamps used for the drilling tool are generally of integral structure. When in use, the drilling tool clamp Hold the drill bit and rotate it to drill holes driven by the power output shaft. With the traditional integral structure, when the drill bit gets stuck or encounters a large resistance, the current will suddenly increase, which may damage the motor on the one hand, and damage the motor on the other. On the one hand, it may also cause the drill bit to jam the workpiece and damage the drill bit. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a low-speed sa...

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Problems solved by technology

[0003] In the prior art, one end of the clamp on the drilling tool is connected to the power output shaft, and the other end is used to clamp the drill bit for drilling. Traditionally, the clamps used for the drilling tool are generally of integral structure. When in use, the drilling tool clamp Hold the drill bit and rotate it to drill holes driven by the power output shaft. With the traditional integral structure, when the drill bit gets stuck or encounters a large resistance, the current will suddenly increase, which may damage the motor on the one hand, and damage the motor on the other. On the one hand, it may also cause the drill bit to jam the workpiece and damage the drill bit

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