Speed-control switch with function of continuously adjusting speed

Abstract

The invention discloses a speed-control switch with function of continuously adjusting speed. The speed-control switch comprises a shell, and a circuit board, a push rod, a speed adjustment sliding block, a dry reed tube and a Hall sensor which are arranged in the shell, wherein the dry reed tube and the Hall sensor are separately and electrically connected with the circuit board; the push rod makes elastic sliding and passes through the shell; the speed adjustment sliding block is arranged at the end, positioned in the shell, of the push rod; the speed adjustment sliding block is arranged atone side of the circuit board in a way of clearance sliding; the speed adjustment sliding block comprises a first magnetic field and a second magnetic field; the dry reed tube is positioned in the first magnetic field, and the Hall sensor is arranged in the second magnetic field; the speed adjustment sliding block makes sliding motion relative to the circuit board; a reed in the dry reed tube is connected or disconnected by sensing the intensity of the first magnetic field; the Hall sensor outputs corresponding Hall voltage by sensing the intensity of the second magnetic field. The normal useof the switch can be effectively guaranteed, contact wear and failure can be prevented, and the speed can be continuously adjusted.

Description

technical field [0001] The invention belongs to the field of speed regulation switches, in particular to a speed regulation switch with continuously adjustable speed. Background technique [0002] In electric tools, speed control switches are widely used, such as hand-held electric drills, electric screw drills, etc. In order to easily adjust the speed and steering of electric tools, a speed control switch is often added to electric tools. However, there are certain shortcomings in the existing speed control switch. The switch part of the existing switch adopts a contact switch. Under normal circumstances, the switch is disconnected, and the push rod switch is pressed to close. The reliability of the contact switch is not high. The contacts are easy to wear and tear, resulting in poor contact; in addition, the speed regulation part adopts resistance step-by-step speed regulation, and several discontinuous speed sections are obtained through different resistance voltage divis...

AI Technical Summary

Problems solved by technology

[0002] In electric tools, speed control switches are widely used, such as hand-held electric drills, electric screw drills, etc. In order to easily adjust the speed and steering of electric tools, a speed control switch is often added to electric tools. However, there are certain shortcomings in the existing speed control switch. The switch part of the existing switch adopts a contact switch. Under normal circumstances, the switch is disconnected, and the push rod switch is pressed to close. The reliability of the contact switch is not high. Contacts are easy to wear and tear, resulting in poor contact; in addition, the speed regulation part adopts resistance step-by-step speed regulation, and several discontinuous speed sections are obtained through different resistance voltage divisions, which cannot realize continuous speed control

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