Anti-pinch lifting circuit and lifting device

Abstract

The invention discloses an anti-pinch lifting circuit and a lifting device, the anti-pinch lifting circuit comprises a lifting circuit body, the lifting circuit body comprises two relays and a motor,forward rotation or reverse rotation of the motor is controlled through the two relays to achieve ascending or descending, and the anti-pinch lifting circuit is characterized by further comprising ananti-pinch circuit, the anti-pinch circuit comprises a conduction circuit, an interlocking circuit and a backup interlocking circuit. The conduction circuit is used for guaranteeing normal operation of the motor when no resistance occurs in the operation process, the interlocking circuit is used for enabling the motor to stop rotating and move reversely when resistance occurs in the operation process, and the backup interlocking circuit is the same as the interlocking circuit in structure and used for guaranteeing the anti-pinch function of the anti-pinch circuit when devices in the interlocking circuit fail. According to the circuit scheme, anti-pinch protection is achieved through pure hardware, the moving part can stop moving and retreat before being pinched, the structure is simple, and safety and reliability are achieved.

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 realizing anti-clamping. Background technique [0002] In household and commercial appliances, some components are often set up 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 by electric control; electric control lift tables and chairs that can be lifted and lowered , toilet with lifting function, washbasin with lifting function, electric bed, etc. In these products, it is usually directly or indirectly through a pair of buttons or switches such as "up / down" or "open / close" to control one or a group of motors to rotate forward / reversely to realize the movement of moving parts; [0003] From the perspective of product safety, when users use this type of product, there is a risk of being pinched in...

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.

Images