Title:
GROUND HARDNESS MEASURING DEVICE, AND GROUND HARDNESS MEASURING METHOD
Document Type and Number:
Japanese Patent JP2023037761
Kind Code:
A
Abstract:
To provide a ground hardness measuring device with high reliability of ground hardness measuring performance and a simple structure, and to provide a ground hardness measuring method with high reliability of ground hardness measuring performance.SOLUTION: A ground hardness measuring device comprises: a cylindrical case (3) equipped in a compaction machine; a shaft member (4) arranged in the case so as to ascend/descend; a weight (5) equipped in the shaft member; an acceleration sensor (6) attached to the weight; a shaft member driving mechanism (7) including a rack member (15) provided in the shaft member, an intermittent gear (16) capable of engaging with the rack member, and a plurality of gear members connected with the intermittent gear in a communication manner; a driving motor (8); and one or more energization springs (9) stretched between an upper end of the shaft member and the case. After driving the shaft member and the weight up to the upper limit position by the driving motor while elongating the energization spring, in a state where the engagement of the intermittent gear and the rack member is released, the shaft member and the weight are made to quickly fall to collide with a ground surface by using energization force of the energization spring, and an acceleration at the time of collision is measured by the acceleration sensor.SELECTED DRAWING: Figure 4
Inventors:
ONODERA TSUTOMU
SATO MASASHI
SATO MASASHI
Application Number:
JP2021144523A
Publication Date:
March 16, 2023
Filing Date:
September 06, 2021
Export Citation:
Assignee:
DIEKRAFT CO LTD
International Classes:
E02D3/026; E02D1/00; G01N3/40
Attorney, Agent or Firm:
Toshio Okamura