The invention provides a crane counterweight hoisting system. A first control valve bank and a first oil cylinder are in pilot connection. A second control valve bank and a second oil cylinder are in pilot connection. The first oil cylinder and the second oil cylinder are both double-acting oil cylinders. The crane counterweight hoisting system also comprises a synchronous selection control valve which is arranged between a main control valve bank and the first and second oil cylinders and contains a first working state and a second working state. In the first working state of the synchronous selection control valve, the first oil cylinder is separately controlled by the first control valve bank, and the second oil cylinder is separately controlled by the second control valve bank. In the second working state of the synchronous selection control valve, a lower rod port of the first oil cylinder is connected with an upper rod port of the second oil cylinder through the synchronous selection control valve so as to connect the first oil cylinder and the second oil cylinder in series. Thus, synchronization action of the first and second oil cylinders is realized. According to the invention, the problem that synchronization action of counterweight oil cylinders cannot be reliably realized by a crane counterweight hoisting system is solved.
Crane counterweight hoisting system
2015-04-22
Patent
Elektronische Ressource
Englisch
IPC: | B66C Krane , CRANES |
Ultra-hoisting counterweight amplitude changing device and crane
Europäisches Patentamt | 2020
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