Handheld electric grinder with shutdown braking device

Abstract

The invention discloses a handheld electric grinder with a shutdown braking device. The handheld electric grinder comprises a body, a rotary shaft unit, a brake disc, a brake device and a power switch. The rotary shaft unit is arranged on the body in a pivoted manner and provided with a brake shaft portion. The brake disc is fixedly arranged on the brake shaft portion, and provided with a brake disc portion. The brake device allows the brake shaft portion to be rotatably inserted, and is provided with a brake body, a brake coil, a plurality of brake springs and a brake block. The power switch can be switched between an on state (ON) and an off state (OFF), so that the brake block is controlled to be separated from the brake disc portion of the brake disc or be in contact with the brake disc portion of the brake disc to generate braking to shorten the time from power losing of the rotary shaft unit to complete stopping of the rotary shaft unit, and the aims of improving work efficiency and lowering work danger are achieved.

Description

technical field [0001] The invention relates to a hand-held electric grinder, in particular to a hand-held electric grinder with a stop braking device. Background technique [0002] At present, the driving methods of hand-held electric grinders are roughly divided into two categories: motor indirect drive (corner type) and motor direct drive. refer to figure 1 As shown, the hand-held electric grinder indirectly driven by the motor is shown. The motor shaft 11 and the grinding wheel shaft 12 are powered by a bevel-shaped angular gear set 13 as the steering transmission. The power switch 14 is switched to start the motor shaft. 11 rotates, and then drives the grinding wheel shaft 12 to rotate synchronously, allowing the grinding wheel 15 lapped on the grinding wheel shaft 12 to perform grinding operations. [0003] However, when the power switch 14 of the hand-held electric grinder is switched from the power-on state (ON) to the power-off state (OFF), although the electric e...

AI Technical Summary

Problems solved by technology

[0003] However, when the power switch 14 of the hand-held electric grinder is switched from the power-on state (ON) to the power-off state (OFF), although the electric energy has stopped converting into kinetic energy, the motor shaft 11 has lost its power source, but the motor The rotating shaft 11 takes too long from power loss to complete stop, so that when the power switch 14 is switched to the power-off state (OFF), the motor rotating shaft 11, the grinding wheel rotating shaft 12 and the grinding wheel 15 cannot stop in a short time. The hand-held electric grinder can be held continuously until the grinding wheel 15 stops rotating completely before the hand-held electric grinder can be placed elsewhere, which will not only reduce work efficiency, but also increase the occurrence of work hazards

Secondly, the hand-held electric grinder generally belongs to a low-speed, high-torque electric machine. Therefore, when the hand-held electric grinder is placed elsewhere before it is completely stopped and is not held, it is very easy to shake and automatically. Rotation, thereby increasing the occurrence of work hazards

Images