3results about How to "Realize emergency stop" patented technology

The utility model discloses a pneumatic steel wire rope electric hoist, aims at solving the problem of uneven winding and insufficient safety braking of the existing electric hoist steel wire rope. It includes electric hoist and insurance unit, and insurance unit is fixed in electric hoist one side. The wire arrangement assembly is driven to move reciprocatingly along the axial direction through the gear transmission of the wire arrangement shaft and the winding shaft of electric hoist, makes the steel wire rope even winding outside the winding shaft, avoids the sudden drop of hoisting object and the abrasion of steel wire rope caused by uneven winding. When the electric hoist is out of control, the safety assembly uses centrifugal force to make the slide rod hit the knock lever, so that the clamping plate is separated, and the plug rod is inserted into the gear under the action of spring, realizes the emergency stop, greatly improves the safety of the device. The present application has the advantages of ingenious structure, effectively improves the working performance and safety factor of electric hoist, and is suitable for various industrial lifting operation scenes.

The application discloses a control device facilitating the stretching and contraction of a ladder chain and a teaching escalator, belongs to the technical field of escalator detection, and is used for controlling the deviation of a chain wheel disc and a ladder chain of the teaching escalator to touch a stroke switch to realize emergency stop, a limiting hole is formed in a mounting side plate, a mounting bearing is slidingly arranged in the limiting hole, a pushing plate is connected with the outer ring of the mounting bearing, a supporting plate is arranged on the mounting side plate and located beside the limiting hole, a first end of an adjusting piece is used for abutting against the supporting plate after penetrating through a preset threaded hole of the supporting plate, the adjusting piece is twisted to abut against the pushing plate through the first end, and then the mounting bearing, a wheel disc mounting shaft and the chain wheel disc are deviated to touch the stroke switch. The adjusting piece is used for driving the deviation movement of the mounting bearing, the wheel disc mounting shaft, the chain wheel disc and the ladder chain as a whole to touch the stroke switch, simulates the fault of ladder chain fracture, and supplements the function of the teaching equipment.

This invention provides an emergency stop self-locking circuit for a DC motor, belonging to the field of motor braking technology. The emergency stop self-locking circuit includes a main circuit, an energy release circuit, and a power-off detection circuit. The energy release circuit consists of MOSFETs connected in parallel across the motor terminals, with the source and drain of the MOSFETs connected to the motor terminals respectively. The power-off detection circuit is a switching circuit used to control the on / off state of the MOSFETs. The switching circuit is connected to the gate of the MOSFETs. When the power supply is on, the switching circuit is off, and the MOSFETs are in the off state. When the power supply is off, the motor acts as a generator to provide current, the switching circuit is on, the MOSFETs become saturated, and the current provided by the motor flows from the positive terminal through the MOSFETs to the negative terminal, causing a short circuit. The advantage of this invention is that this structure allows the motor to achieve an emergency stop function while reducing the size of the push rod, facilitating processing and installation. This invention is used for emergency stop control of motors.