Title:
【発明の名称】油圧作動の削岩施設における装置
Document Type and Number:
Japanese Patent JP3464223
Kind Code:
B2
Abstract:
PCT No. PCT/FI95/00183 Sec. 371 Date Oct. 4, 1996 Sec. 102(e) Date Oct. 4, 1996 PCT Filed Apr. 4, 1995 PCT Pub. No. WO95/28549 PCT Pub. Date Oct. 26, 1995Arrangement in a hydraulically operated rock drilling equipment comprising a feed motor (3), a percussion device (2), and a hydraulic pump (1) for feeding hydraulic fluid to the feed motor (3) and the percussion device (2). The arrangement comprises a pressure control valve (17) connected to be controlled on the basis of the control signal of the feed regulation valve (8) when starting the drilling so that when the value of the control signal is below a predetermined switching value, the pressure relief valve (18) is connected to the percussion pressure line (13) of the percussion device (2), and when the control signal exceeds the switching value, the pressure control valve (17) disconnects the pressure relief valve (18) from the percussion pressure line (13) and connects the pressure difference valve (20) in communication with the percussion pressure line (13).
Inventors:
Niemi, Yaakko
Application Number:
JP52674395A
Publication Date:
November 05, 2003
Filing Date:
April 04, 1995
Export Citation:
Assignee:
Thamrock Oy
International Classes:
E21B44/00; E21B19/08; E21B44/06; (IPC1-7): E21B19/08
Other References:
【文献】国際公開94/24415(WO,A1)
【文献】米国特許5121802(US,A)
【文献】米国特許5121802(US,A)
Attorney, Agent or Firm:
Tadashi Hagino (3 outside)