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1. 发明专利

JP2000064281A CURRENT SUPPLYING DEVICE FOR OPENING AND CLOSING CHUCK IN CASING FORCING-IN DEVICE 失效
公开(公告)号：JP2000064281A
公开(公告)日：2000-02-29
申请号：JP24114698
申请日：1998-08-13
申请人： SANWA KIZAI CO LTD
发明人： TORIKAI MITSUTOSHI , INOUE KOJI , TAKAGI EI
IPC分类号： E21B19/06 , E02D7/20
摘要： PROBLEM TO BE SOLVED: To save uselessness of power like a delivery of unnecessary hydraulic pressure by disposing a primary coil and a secondary coil on an elevating and lowering frame on a non-rotation side and a rotary body, respectively, and utilizing induced current generated in the secondary coil by electromagnetic induction of the primary coil. SOLUTION: A primary side coil 21 is disposed concentrically with a rotary body 4, this coil 21 is connected with a generator as a power source, an annular secondary side coil 22 having the same diameter as that of the primary side coil 21 and surrounding the rotary body 4 in the same way is disposed in a positional relation in which the secondary side coil 22 faces the primary side coil 21 and this coil 22 is connected with an electric motor for driving of a hydraulic pump. After force-feeding corresponding to one stroke of a jack 2 for forcing-in..., the primary side coil 21 is energized again, the hydraulic pump is driven by induced current generated in the secondary side coil 22 by the electromagnetic induction, next, a switching operation is performed for a hydraulic circuit, hydraulic pressure is delivered to a hydraulic cylinder 16 for opening and closing chuck, this cylinder 16 is elongated and driven and thereby a chuck is opened.

2. 发明专利

JPH07158056A CONTROL DEVICE FOR SOIL IMPROVEMENT MACHINE 失效
公开(公告)号：JPH07158056A
公开(公告)日：1995-06-20
申请号：JP30908093
申请日：1993-12-09
申请人： SANWA KIZAI CO LTD
发明人： TSUBOTA KAZUKI , INOUE KOJI
IPC分类号： E02F9/20 , E02D3/12 , E02D17/13 , E02F5/02
摘要： PURPOSE:To improve the soil to the best condition suitable for the properties thereof, regardless of the change of an excavation or drawing speed due to the properties, by calculating the number of revolutions of an agitation rod optimum for soil agitation at all times or at every unit time. CONSTITUTION:At an excavation and agitation process, an electric motor 7 is first started to rotate an agitation rod 8. Then, a drive section 4 is lowered, while the soil is being filled with chemicals 11 from the end of the rod 8, thereby improving the soil. When the soil is being excavated and agitated, a current excavation depth is always detected from the paid-out length or the like of a wire 5. Then, an excavation speed is calculated on the basis of a signal for the excavation depth so detected and furthermore, the optimum number of revolutions of the rod 8 is calculated, using the established formula. The result of the calculation is converted to a frequency signal and transmitted to the motor 7 and even to the rod 8. At the time of drawing the rod 8, the optimum number of revolutions is also calculated for the control thereof.

3. 发明专利

JPH0921287A DRIVE CONTROL DEVICE FOR EXCAVATOR 失效
公开(公告)号：JPH0921287A
公开(公告)日：1997-01-21
申请号：JP16992895
申请日：1995-07-05
申请人： SANWA KIZAI CO LTD
发明人： INOUE KOJI
IPC分类号： E21B7/00
摘要： PROBLEM TO BE SOLVED: To automatically and accurately drive and control an excavator by connecting power terminals to the terminals of an AC motor in the prescribed phase order based on the the forward/reverse set result and the judged result of the power phase order. SOLUTION: Whether a work member is operated in the AC current 26 mode or in the inverter 27 mode is switched by an operation mode switching means 22. Whether the work member is forward-driven or reverse-driven is set by a forward/reverse setting means 23. A power phase order judging means 24 judges the phase order of the AC power when the work member is operated in the AC mode. A power terminal switching means 25 connects power terminals to the terminals of an AC motor 28 in the prescribed phase order based on the set result by the forward/reverse setting means 23 and the judged result by the power phase order judging means 24.

4. 发明专利

JPH07208054A DRIVE CONTROLLER OF EXCAVATION MACHINE 失效
公开(公告)号：JPH07208054A
公开(公告)日：1995-08-08
申请号：JP660494
申请日：1994-01-25
申请人： SANWA KIZAI CO LTD
发明人： TSUBOTA KAZUKI , INOUE KOJI
IPC分类号： E21B3/02 , E02D17/13 , E02F5/02 , E21B7/00
摘要： PURPOSE:To secure a necessary torque for excavation without over loading true driving motor of an excavator and increase the revolution as high as possible to carry out efficient excavation. CONSTITUTION:A driving controller of an excavator is provided with an ordinary driving circuit 9 driving a motor 7, an inverter circuit 10, a circuit- changeover device 11 selectively changing over both circuits 9, 10 and connecting the motor 7 of excavator, a loading current detector 12 of the motor, a discriminating device 13 of the driving method of the motor, and an inverter speed setter 14. The discriminating device of the driving method of the motor controls the circuit changeover device so as to change the ordinary circuit to the inverter circuit when the load current detected by the current detector is within the preset value and change the inverter circuit to the ordinary circuit 9 when the load current exceeds the preset value. And further, the inverter frequency is raised when the load current is within a preset figure in a specified frequency and the inverter frequency is kept constant when it exceeds the preset figure.

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