Control method for controlling retraction of boom, mechanical device and storage medium
US12312219B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 2024 |
| Grant date | May 27, 2025 |
| Priority date | — |
| Expiry date | Jun 24, 2044 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/6336
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control method for controlling retraction of a boom is applied to a hydraulic system which combines retraction of the boom by self-weight with retraction of the boom by pressure. The control method includes: when the boom is retracted, controlling the self-weight retraction proportional valve to be at a maximum opening; obtaining an actual speed at which the boom is retracted; controlling a rotation speed of the pressure retraction motor to rise or an opening degree of the pressure retraction proportional valve to increase when the actual speed is less than a preset speed; and controlling the rotation speed of the pressure retraction motor to reduce or the opening degree of the pressure retraction proportional valve to decrease when the actual speed is greater than the preset speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.