发明名称 |
Computer-controlled oil drilling rig having drawworks motor and brake control arrangement |
摘要 |
An oil drilling rig includes a racker, a power tongs, a drawworks having a motor and a brake, and a general purpose programmable digital computer associated with each to sequentially initiate the operation thereof. Closed-loop control systems for the drawworks motor and drawworks brake are included to provide control signals to a motor drive and to a brake actuator.
|
申请公布号 |
US4187546(A) |
申请公布日期 |
1980.02.05 |
申请号 |
US19770777724 |
申请日期 |
1977.03.15 |
申请人 |
B J HUGHES INC |
发明人 |
HEFFERNAN, JAMES P;SHELDON, LOREN B;TOMASHEK, JAMES R;WARD, DONALD H |
分类号 |
E21B19/20;E21B44/00;G05B15/02;G06G7/66;(IPC1-7):E21B19/00;G06F15/20 |
主分类号 |
E21B19/20 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|