SERVICE MACHINE STOPPING APPARATUS FOR MIDGET ROTARY POWER SHOVEL

Title:

SERVICE MACHINE STOPPING APPARATUS FOR MIDGET ROTARY POWER SHOVEL

Document Type and Number:

WIPO Patent Application WO/1990/008233

Kind Code:

A1

Abstract:

This invention relates to a service machine stopping apparatus for a midget rotary power shovel capable of rotating in a small space. In a midget rotary power shovel of the type wherein an upper rotary member is rotatably disposed on a lower travelling member capable of self-travelling and a service machine is mounted onto this upper rotary member, the service machine shopping apparatus comprises operation valves each for controlling each of a boom cylinder, arm cylinder and offset cylinder, a solenoid valve which is disposed in tubing connecting each operation valve with each cylinder and is switched from a communication position to a cut-off position when the service machine reaches a critical zone ahead of an interference region and a check valve for checking the flow in the cylinder direction when in the cut-off position. Therefore, when the service machine reaches the critical zone ahead of the interference region, it is stopped instantaneously and interference of the service machine can be prevented reliably. Since the solenoid valve is assembled directly in the tubing communicating with the cylinders, the response speed of the solenoid value act as a time lag occurring at the stop of the service machine, the critical zone can be made smaller than that of the prior art apparatuses and the operation range can be increased drastically.

Inventors:

HACHISU YASUYUKI (JP)

Application Number:

PCT/JP1990/000070

Publication Date:

July 26, 1990

Filing Date:

January 22, 1990

Export Citation:

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Assignee:

KOMATSU MFG CO LTD (JP)
KOMATSU ZENOA KK (JP)

International Classes:

E02F9/20; E02F3/43; E02F9/22; H02J9/06; (IPC1-7): E02F3/43

Foreign References:

JPH06153922A	1994-06-03
JPS61216938A	1986-09-26
JPS58160437A	1983-09-22
JPS517705A	1976-01-22

Other References: