News

On November 4, 2024, news from the National Intellectual Property Administration of China reported that Zhejiang SANY Equipment Co., Ltd. has been granted a patent for a "Rotary Hydraulic System, Rotary Device, and Working Machine," with the publication number CN 221939956 U. The application date was February 2024.

This utility model relates to the field of construction machinery technology and provides a rotary hydraulic system, rotary device, and working machine. The system includes a rotary working oil circuit, braking oil circuit, free slip oil circuit, and a control device. The rotary working oil circuit consists of a first hydraulic pump and rotary motor. The inlet and outlet of the first hydraulic pump are correspondingly connected to the inlet and outlet of the rotary motor. The first hydraulic pump supplies oil to the rotary motor, which drives the rotary mechanism. The braking oil circuit is used to provide braking force for the rotary mechanism.

The free slip oil circuit is parallel to the rotary motor. When the free slip oil circuit is open, the hydraulic oil from the first hydraulic pump circulates directly through the free slip oil circuit, bypassing the rotary motor, which loses power. When the braking oil circuit starts braking, the control device activates the free slip oil circuit. At this point, since the rotary motor can no longer provide rotary force for the mechanism, it enters a free slip state, preventing pressure shock during braking.