Title:
FAULT DIAGNOSIS DEVICE FOR HYDRAULIC EQUIPMENT
Document Type and Number:
Japanese Patent JP2016031086
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a fault diagnosis device for hydraulic equipment for setting a drain amount at a hydraulic circuit to a suitable normal value to reduce loss of entire device under application of a spool valve having a spool position sensor.SOLUTION: A hydraulic cylinder 61 is operated to cause an upper die 62 to descend to depress a work-piece 64 installed at a lower die 63, and a spool valve 65 having a spool position sensor is connected to a hydraulic supply passage (oil passage) of the hydraulic cylinder 61. A reference number 66 denotes a relief valve for determining maximum pressure of the entire circuit, a reference number 67 denotes a change-over valve for on-load un-load states, a reference number 68 denotes a change-over valve for pressurizing and descending and rapid descending of the hydraulic cylinder 61, and a reference number 69 denotes a safety valve to avoid abnormal pressure in the hydraulic cylinder 61. A reference number 70 denotes a counter-balance valve to assure a back-pressure occurred at the time of descending of the hydraulic cylinder 61 and prevent its dead weight dropping. A reference number 71 denotes a hydraulic source.SELECTED DRAWING: Figure 1
Inventors:
OGURA YUJI
IKENO SHINICHI
KUBO MITSUO
IKENO SHINICHI
KUBO MITSUO
Application Number:
JP2014152666A
Publication Date:
March 07, 2016
Filing Date:
July 28, 2014
Export Citation:
Assignee:
NACHI FUJIKOSHI CORP
International Classes:
F15B20/00; F16K31/06; F16K37/00
Domestic Patent References:
| JPH0360664U | 1991-06-14 | |||
| JP2001032958A | 2001-02-06 | |||
| JP2009503403A | 2009-01-29 |
Attorney, Agent or Firm:
Akiko Okajima