Title:
MAST HEIGHT MEASUREMENT DEVICE AND OPERATION DIAGNOSTIC DEVICE FOR FORKLIFTS
Document Type and Number:
WIPO Patent Application WO/2023/132094
Kind Code:
A1
Abstract:
Provided are a mast height measurement device 4, etc., for forklifts, capable of accurately measuring mast height while being inexpensive and having a simple configuration. Correlation data indicating the correlation between the stroke amount of a control valve 21 that controls the discharge pressure and rotational speed of a hydraulic pump 26 for supplying hydraulic fluid to a lift cylinder 14 and also controls the flow of the hydraulic fluid into and out of the lift cylinder 14, and the flow rate of hydraulic fluid flowing into and out of the lift cylinder 14 is recorded. The discharge pressure measurement data of the hydraulic pump 26, the rotational speed measurement data of the hydraulic pump 26, and the stroke measurement data of the control valve 21 are acquired. From the values of the discharge pressure measurement data, the rotational speed measurement data, and the stroke measurement data, the flow rate of the hydraulic fluid flowing into and out of the lift cylinder 14 is calculated with reference to the correlation data, and the mast height is calculated on the basis of the hydraulic fluid flow rate.
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Inventors:
NIWA MICHIHIRO (JP)
GOSHIMA DAISUKE (JP)
GOSHIMA DAISUKE (JP)
Application Number:
PCT/JP2022/029488
Publication Date:
July 13, 2023
Filing Date:
August 01, 2022
Export Citation:
Assignee:
SHIMADZU CORP (JP)
International Classes:
B66F9/20; B66F9/24
Foreign References:
| JP2000318998A | 2000-11-21 | |||
| JPH06127897A | 1994-05-10 | |||
| JPH02255499A | 1990-10-16 | |||
| JP2019210130A | 2019-12-12 | |||
| EP2123594A1 | 2009-11-25 |
Attorney, Agent or Firm:
NISHIMURA, Ryuhei et al. (JP)
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