Title:
HANGING LOAD COMPUTING METHOD FOR HYDRAULIC SHOVEL DESIGNED FOR CRANE
Document Type and Number:
Japanese Patent JP3877871
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To accurately compute hanging load of a hydraulic shovel designed for a crane and to ensure safety even if operating oil leaks from a safety measured valve or hung cargoes are increased/decreased when the movement of an attachment is stopped.
SOLUTION: For a hydraulic shovel designed for a crane, wherein a hanging hook is mounted at the end of an attachment and a HBCV(a hose burst check valve) is provided as a safety measured valve in damaging a hydraulic hose, if the attachment is in a stopped condition for a preset time or more when a boom angle and an arm angle and bottom pressure and rod pressure in a boom cylinder are detected (1, 2) and hanging load and rated load on the attachment is computed from detection values (5), the hanging load in the stopped condition is judged to be increased/decreased (7). If the hanging load in the stopped condition is not increased/decreased, a computed value for the hanging load computed till then is held and new computation is interrupted. On the other hand, if the hanging load in the stopped condition is increased/decreased, the hanging load is newly computed.
Inventors:
Naoki Kashima
Application Number:
JP14331898A
Publication Date:
February 07, 2007
Filing Date:
May 25, 1998
Export Citation:
Assignee:
Sumitomo Construction Machinery Manufacturing Co., Ltd.
International Classes:
E02F9/20; B66C1/68; B66C13/16; G01G19/14; (IPC1-7): E02F9/20; B66C1/68; B66C13/16; G01G19/14
Domestic Patent References:
| JP7259141A | ||||
| JP5202535A | ||||
| JP59217839A | ||||
| JP59227692A |
Attorney, Agent or Firm:
Takakichi Hayashi
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