Single-phase electric gourd with lower caging device

Abstract

The invention relates to a single-phase electric hoist in lifting equipment, in particular to a single-phase electric hoist with a lower limit device. The invention adopts a technical proposal that the single-phase electric hoist with the lower limit device comprises a shell, as well as a reel, a speed reducer, a motor driving the reel to rotate, a control component, a steel wire rope wound on the reel, an upper limit device and a lower limit device which are arranged inside the shell; the lower limit device is arranged on the single-phase electric hoist; the lower limit device comprises a microswitch component and a guide rod which is matched with the microswitch component to control the rotation of the motor; one end of the guide rod is arranged on the corresponding side of the reel, and the other end of the guide rod is in collision fit with the microswitch component; a suitable position of the reel is provided with a through hole; the steel wire rope passes through the through hole and then is wound on the reel for one to five circles, and the end parts of the steel wire rope are fixed; the motor is a single-phase double-value capacitance-operating bypassed magnetic braking type asynchronous motor; when the single-phase electric hoist lifts a heavy object, higher-value capacitance is used for starting operation; and when the single-phase electric hoist drops the heave object, lower-value capacitance is used for starting the operation. With the technical proposal, the invention provides the single-phase electric hoist which is simple in structure, safe to use and higher in working character, shuts down when the single-phase electric hoist drops to the lowest point, and is provided with the lower limit device.

Description

technical field [0001] The invention relates to a single-phase electric hoist in lifting equipment, in particular to a single-phase electric hoist with a lower limit device. Background technique [0002] Single-phase electric hoist is a kind of lifting equipment that is widely used. The single-phase electric hoist that appears and reports on the market and data mainly includes a shell, a reel arranged inside the shell, and a wire rope that is wound and matched with the reel. The motor reducer and upper limit device that drive the reel to rotate, when the equipment lowers the heavy object, after the steel wire rope on the reel is exhausted, because there is no lower limit device, if the control parts cannot be controlled in time, the motor will not stop in time running, the reel will continue to rotate, and if the steel wire rope is wound on the reel in the opposite direction, the heavy object will rise instead, causing damage to the upper limit device, and when the steel wir...

AI Technical Summary

Problems solved by technology

[0002] Single-phase electric hoist is a kind of lifting equipment that is widely used. The single-phase electric hoist that appears and reports on the market and data mainly includes a shell, a reel arranged inside the shell, and a wire rope that is wound and matched with the reel. The motor reducer and upper limit device that drive the reel to rotate, when the equipment lowers the heavy object, after the steel wire rope on the reel is exhausted, because there is no lower limit device, if the control parts cannot be controlled in time, the motor will not stop in time running, the reel will continue to rotate, and if the steel wire rope is wound on the reel in the opposite direction, the heavy object will rise instead, causing damage to the upper limit device, and when the steel wire rope on the reel is exhausted, the heavy object may not touch the ground. Due to the insufficient fastening force at the end of the wire rope, the heavy object will fall, which poses a great safety hazard; in the prior art, the drive motor of the single-phase electric hoist is a single-phase When the equipment lowers the heavy object, because the heavy object does positive work, the capacitance value will be too large as when lifting the heavy object, causing the motor temperature to rise too fast and too high, which reduces the working capacity of the motor.

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