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Title:
CRANE HYDRAULIC SYSTEM AND CONTROL METHOD BASED ON SYSTEM
Document Type and Number:
WIPO Patent Application WO/2016/066126
Kind Code:
A1
Abstract:
Disclosed are a crane hydraulic system and a control method based on the system. The crane hydraulic system comprises a load sensing sub-system, said sub-system comprising a variable pump (1-1), a variable pump oil inlet path (1-2), a load feedback path (1-3), an oil return path (1-4) and a pressure compensator (1-5), the pressure compensator (1-5) being provided with an oil inlet port (1-51), an oil outlet port (1-52), a first oil control port (1-53), a second oil control port (1-54) and a control spring (1-55), the oil inlet port (1-51) being connected to the variable pump oil inlet path (1-2), the oil outlet port (1-52) being connected to the oil return path (1-4), the first oil control port (1-53) being connected to the load feedback path (1-3), the second oil control port (1-54) also being connected to the variable pump oil inlet path (1-2), the control spring (1-55) and the first oil control port (1-53) being located at a same end of the pressure compensator (1-5), the set pressure of the control spring (1-55) being greater than the pressure difference of the variable pump (1-1). Via the load sensing sub-system, the pressure compensator can be turned on at the moment when a winch system starts up and shuts down, and the variable pump oil inlet path is connected to the oil return path, implementing pressure relief, and thereby reducing pressure spikes.

Inventors:
SHAN ZENGHAI (CN)
HU XIAODONG (CN)
JIAO GUOWANG (CN)
ZHOU BIN (CN)
YUAN CONGLIN (CN)
Application Number:
CN2015/093293
Publication Date:
May 06, 2016
Filing Date:
October 30, 2015
Export Citation:
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Assignee:
XUZHOU HEAVY MACHINERY CO LTD (CN)
International Classes:
F15B13/02; B66C13/20; B66D1/08; F15B11/08; F15B13/16
Foreign References:
CN203297181U2013-11-20
CN103244509A2013-08-14
CN102345749A2012-02-08
CN103482476A2014-01-01
CN104088830A2014-10-08
US3841096A1974-10-15
US6089248A2000-07-18
CN103130099A2013-06-05
CN103089729A2013-05-08
CN103303801A2013-09-18
CN103244492A2013-08-14
Attorney, Agent or Firm:
CCPIT PATENT AND TRADEMARK LAW OFFICE (CN)
中国国际贸易促进委员会专利商标事务所 (CN)
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