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1. (WO2018086504) RAISING/LOWERING SYNCHRONIZATION SYSTEM FOR REFRIGERATOR RACK AND CONTROL METHOD THEREOF

Pub. No.:    WO/2018/086504    International Application No.:    PCT/CN2017/109668
Publication Date: Fri May 18 01:59:59 CEST 2018 International Filing Date: Wed Nov 08 00:59:59 CET 2017
IPC: F25D 25/02
F25D 29/00
H02P 6/04
Applicants: QINGDAO HAIER JOINT STOCK CO., LTD.
青岛海尔股份有限公司
Inventors: TANG, Haidong
唐海东
LIU, Mingyong
刘明勇
WU, Guangrui
吴光瑞
ZHANG, Heng
张珩
WANG, Ning
王宁
Title: RAISING/LOWERING SYNCHRONIZATION SYSTEM FOR REFRIGERATOR RACK AND CONTROL METHOD THEREOF
Abstract:
Provided are a raising/lowering synchronization system (10) for a refrigerator rack and a control method thereof. The system comprises: a controller, a rack body (11), and at least two raising/lowering mechanisms (12). Each raising/lowering mechanism (12) comprises: a motor (121); a drive screw (122); a guide rod (123) provided thereon with a top limiting device (126) and a bottom limiting device (127); and a connecting member (124) provided thereon with a sliding nut (125) that is raised or lowered to drive the connecting member (124) and the rack body (11) to move along the guide rod (123). When the connecting member (124) touches the top limiting device (126) or the bottom limiting device (127), the top limiting device (126) or the bottom limiting device (127) feeds back a position signal of the connecting member (124) to a controller; the controller is configured to control the motor to stop operating according to the position signal fed back by the top limiting device (126) or the bottom limiting device (127). The method comprises: a sensor collects rotation speed and step number signals of each motor (121) and feeds back the signals to a controller; when the controller analyzes that the rotation speed and step number signals of different motors (121) are different, the controller issues a control signal to each motor (121) to adjust rotation speeds and step numbers of all the motors (121) until all the motors (121) operate synchronously.