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Title:
AUTOMATIC PENETRATION TEST MACHINE
Document Type and Number:
Japanese Patent JP2015132161
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an automatic penetration test machine capable of stably achieving load control by feedback while reducing an impact load when a penetration rod penetrates into the ground.SOLUTION: An automatic penetration test machine 1 includes: a lifting and lowering base 3; a chuck 5 provided on the lifting and lowering base 3 and holding a penetration rod 4; a lifting and lowering motor 8 for performing the lifting and lowering operation of the lifting and lowering base 3; a load cell 22 for detecting a load applied to the tip of the penetration rod 4; and control means 10 which, after the lifting and lowering base 3 at an elevation position has been lowered at a high speed by controlling the speed of the lifting and lowering motor 8 and immediately before the tip of the penetration rod 3 penetrates into the ground, issues a deceleration command to the lifting and lowering motor 8, and when the penetration rod 4 penetrates into the ground, switches the lifting and lowering motor 8 to load control and compensates the output torque of the lifting and lowering motor as necessary while feeding back the detection value by the load cell 22, thereby applying a target test load.

Inventors:
YASUEDA MASAAKI
ISONO KAZUNORI
Application Number:
JP2015045288A
Publication Date:
July 23, 2015
Filing Date:
March 06, 2015
Export Citation:
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Assignee:
NITTO SEIKO KK
International Classes:
E02D1/02; G01N3/40
Domestic Patent References:
JP2004316262A2004-11-11
JPH0995931A1997-04-08
JP2004278114A2004-10-07
JPH0995930A1997-04-08
JP2015132162A2015-07-23
JP2004316262A2004-11-11
JPH0995931A1997-04-08
JP2004278114A2004-10-07
JPH0995930A1997-04-08



 
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