A lifting circuit and lifting device capable of realizing anti-pinch

Abstract

The invention discloses a lifting circuit and a lifting device capable of realizing anti-pinch, comprising a lifting circuit, the lifting circuit comprising two relays and a motor, and the forward rotation or reverse rotation of the motor is controlled by the two relays to realize the lifting or lowering, It is characterized in that it also includes an anti-pinch circuit, and the anti-pinch circuit includes a conduction circuit, an interlock circuit and a backup interlock circuit; wherein, the conduction circuit is used to ensure the normal operation of the motor when there is no resistance during operation, and to ensure the normal operation of the motor. The lock circuit is used to stop the motor and move in the opposite direction when there is resistance during operation, and the backup interlock circuit has the same structure as the interlock circuit. It is used to ensure the anti-pinch circuit when the device fails in the interlock circuit. clip function. The invention provides a circuit scheme of anti-pinch protection realized by pure hardware, which can make the moving parts stop moving and retreat before the pinch injury occurs, and has a simple structure and is safe and reliable.

Description

technical field [0001] The invention relates to the field of lifting circuits, in particular to a lifting circuit and a lifting device capable of preventing clipping. Background technique [0002] In household and commercial appliances, some components are often set to control them to achieve simple movements for more convenient use, such as range hood panels that can be opened and closed automatically, cabinet doors that can be opened and closed electrically; , toilet with lift function, wash basin with lift function, electric bed, etc. In these products, a pair of buttons or switches such as "up / down" or "open / close" is usually used directly or indirectly to control one or a group of motors to rotate forward / reversely to realize the movement of moving parts; [0003] From the point of view of the safety of product use, when users use this type of product, there is a risk of being pinched in one direction of movement. For example, when the panel of the range hood is closed...

AI Technical Summary

Problems solved by technology

[0004] However, the cost of this solution is high, the installation structure is complicated when it is matched with the product, and software safety certification needs to be applied for at the same time. In addition, this solution does not take into account the countermeasures in the failure mode, so it cannot be safe and reliable.

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