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1. 发明专利

JP2000154539A TILTING-DOWN METHOD FOR LEADER AND DEVICE THEREFOR 失效
公开(公告)号：JP2000154539A
公开(公告)日：2000-06-06
申请号：JP32893998
申请日：1998-11-19
申请人： HITACHI CONSTRUCTION MACHINERY , OHORI KK
发明人： FUKUSHIMA KATSUJI , DATE KENICHIRO , OHORI MASATO
IPC分类号： E21B15/00 , E02D7/14
摘要： PROBLEM TO BE SOLVED: To provide a tilting-down method for a leader capable of supporting it securely by a mating crane when the leader is laid on its side and a device therefor. SOLUTION: When a leader erected on a pile driving machine is laid on its side, the falling down operation by a leader raising-up and tilting-down winch 6 is inhibitted when it is inclined to a smaller angle than an auxiliary angle by the leader tilting-down operation by the leader raising-up and tilting- down winch 6. After that, the leader raisingup and tilting-down winch is started again and is laid on its side in a condition in which the leader is supported by a mating crane.

2. 发明专利

JP2001328795A CRANE REVOLUTION CONTROL DEVICE 失效
公开(公告)号：JP2001328795A
公开(公告)日：2001-11-27
申请号：JP2000147900
申请日：2000-05-19
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： UDAGAWA TSUTOMU , IGARASHI TERUO , NARISAWA JUNICHI , DATE KENICHIRO , ISHIDA KAZUHISA , FUNATO KOJI
IPC分类号： B66C23/86 , F15B11/00 , F15B11/08
摘要： PROBLEM TO BE SOLVED: To provide a crane revolution control device capable of relieving the shock of a revolving element as much as practicable even in the case the signal output to a solenoid-operated proportional decompression valve to control the drive of the revolving element is stopped. SOLUTION: Pipelines 6A and 6B in connection to the inlet/outlet port of a hydraulic motor 2 for revolution are connected by hydraulic selector valves 9A and 9B, and the drive of these valves 9A and 9B is controlled by the solenoid-operated proportional decompression valve 9C so that the two pipelines 6A and 6B are put in communication and shut off in conformity to the signals given from a mode selecting switch 13, pressure sensors 10A and 10B, and a rotating speed sensor 11. The hydraulic selector valve 9B is set to valve characteristics such that the pipelines 6A and 6B are in mutual communication in a minute quantity when the signal output to the decompression valve 9C is stopped due to wire severance, etc., whereby the hydraulic braking force is reduced and the shock of the revolving element 43 is relieved.

3. 发明专利

JP2001048483A SAFETY DEVICE FOR HYDRAULIC WINCH 失效
公开(公告)号：JP2001048483A
公开(公告)日：2001-02-20
申请号：JP23069699
申请日：1999-08-17
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： DATE KENICHIRO , ISHIDA KAZUHISA , FUNATO KOJI
IPC分类号： B66D1/54 , B66D1/44
摘要： PROBLEM TO BE SOLVED: To certainly stop a drum when a pipe connecting each hydraulic motor is broken, in a hydraulic winch driven by a pair of hydraulic motors. SOLUTION: This winch is provided with first and second counter balance valves 5, 6 and first and second selecting valves 21, 22, corresponding to first and second hydraulic motors 2, 3 respectively, and the first selecting valve 21 and the second selecting valve 22 are connected with a pipe 23. The first and second selecting valves 21, 22 are severally selected on the base of pressure in the pipe 23, and when the pipe 23 is broken, each of the first and second selecting valves 21, 22 is shifted to a position (a). Therefore, pressure oil in holding conduits 11, 12 is led to spring side pilot chambers 17a, 18a of spools 17, 18 of counter balance valves 5, 6, and then the spools 17, 18 are closed to stop the rotation of the hydraulic motors 2, 3.

4. 发明专利

JP2000351585A BRAKE DEVICE FOR WINCH 失效
公开(公告)号：JP2000351585A
公开(公告)日：2000-12-19
申请号：JP16681999
申请日：1999-06-14
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： ISHIDA KAZUHISA , FUNATO KOJI , DATE KENICHIRO
IPC分类号： B66D5/26
摘要： PROBLEM TO BE SOLVED: To release the brake of a winch with the proper timing at the operation time of an operation lever and also operate the brake surely at the neutral time of the opertion lever. SOLUTION: A selector valve 62 switched by the pilot pressure generated by the operation of an operation lever 7 and a brake valve 61 switched by the motor operation pressure generated by the drive of a direction control valve 3 are arranged in series between a pilot hydraulic pump 9 and hydraulic brake 5. Thereby, the brake 5 can be released at the same time as the rotation of the hydraulic motor 2 and even if the brake valve 61 is stuck, the brake 5 can be operated surely by the return operation of the lever 7.

5. 发明专利

JPH0886184A HYDRAULIC CIRCUIT OF PILE DRIVER 失效
公开(公告)号：JPH0886184A
公开(公告)日：1996-04-02
申请号：JP22183394
申请日：1994-09-16
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： DATE KENICHIRO , MIYATA KENICHI
IPC分类号： E21B44/06 , E21B3/02 , E21B3/035 , E21B44/00
摘要： PURPOSE: To suitably keep the edge tip load of an excavating member by disposing a variable relief valve in a pipe line for connecting a pipe line, which serves as the inlet side of a hydraulic motor when an elevating member is lowered, to an oil pressure tank, and setting the oil pressure in an operator cab. CONSTITUTION: In a pipe driver adapted to elevate an elevating member suspending an excavating member fitted to a reamer by driving a hydraulic motor 14 in rotation, pipe lines 20a, 20b are provided for connecting the hydraulic motor 14 to an oil hydraulic pump 10 for supplying oil pressure through a directional switching valve 12. A variable relief valve 22 is disposed in a connecting path 21 for connecting the pipe line 20a which serves as the inlet side of the hydraulic motor 14 when the elevating member is lowered and the oil pressure tank to each other, and oil pressure is set by an operating member provided in an operator cab. When the descending speed of an auger screw is excessively high, the preset pressure of the variable relief valve 22 is reduced to decrease the descending speed and lower the edge tip load. After the edge tip load is set to a suitable value, the edge tip load is kept within a suitable range only by holding an operating lever on the descend side.

6. 发明专利

JP2001082405A SPEED CONTROL DEVICE OF CONSTRUCTION MACHINE 失效
公开(公告)号：JP2001082405A
公开(公告)日：2001-03-27
申请号：JP26441199
申请日：1999-09-17
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： DATE KENICHIRO , ISHIDA KAZUHISA , FUNATO KOJI , NARISAWA JUNICHI
IPC分类号： E02F9/20 , B66C13/20 , B66C13/23 , B66C23/82 , E02F9/22 , F15B11/04
摘要： PROBLEM TO BE SOLVED: To provide a speed control device of a crane easily changable to three kinds of speed modes of a crawling speed, a high speed and a constant speed. SOLUTION: A regulator 21a for controlling a tilt angle qp of a hydraulic pump 21 and a regulator 22a for controlling a tilt angle qm of a hydraulic motor 22 are respectively connected to a pilot oil pressure source 25 via hydraulic directional control valves 31, 33 and solenoid proportional pressure reducing valves 32, 34, and a mode changeover switch 15a and a speed setting dial 15b are connected to a computing element 36. The mode changeover switch 15a can be switched to three positions in response to speed modes, and the computing element 36 performs a prescribed operation according to a position of the switch 15a and a preset value (a) of the dial 15b to output a control signal to the solenoid proportional pressure reducing valves 32, 34 to thereby control a pressure reducing degree of the solenoid proportional pressure reducing valves 32, 34 in response to the speed modes so as to change the upper limit value of the tilt angle qp of the pump and the lower limit value of the tilt angle qm of the motor.

7. 发明专利

JPH08177803A HYDRAULIC CONTROL CIRCUIT 失效
公开(公告)号：JPH08177803A
公开(公告)日：1996-07-12
申请号：JP31825594
申请日：1994-12-21
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： DATE KENICHIRO
IPC分类号： B66D1/44 , F15B11/02 , F15B11/16
摘要： PURPOSE: To provide a hydraulic control circuit which secures advantage of a variable volume hydraulic motor for covering a wide speed range and improves operability at the time of compound operation. CONSTITUTION: A plurality of hydraulic actuators 1 to 3 are serially connected to a hydraulic pressure source 4. At least one of the actuators 2, 3 from the second one from the hydraulic pressure source 4 is relevant to a hydraulic control circuit as a variable volume hydraulic motor 3. Capacity command means 12, 13 output higher one of a negative pressure of the variable volume hydraulic motor 3 and pressure supplied to the extremely upstream side among the hydraulic actuators 1 to 3 as a command pressure Ps. A capacity setting means 11 so sets a discharge volume of the variable volume hydraulic motor 3 corresponding to the command pressure Ps, that the higher the pressure Ps is, the larger the discharge volume of the motor 3 is, while the lower the pressure Ps is, the smaller the discharge volume of the motor 3 is.

8. 发明专利

JPH04120313A ARM TYPE WORK MACHINE WITH GUIDE SHEAVE 失效
公开(公告)号：JPH04120313A
公开(公告)日：1992-04-21
申请号：JP41320890
申请日：1990-12-21
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： DATE KENICHIRO , SATO YUHEI
IPC分类号： E02D7/16 , B66C23/66 , B66D1/54 , E02D13/00
摘要： PURPOSE:To enable a pile or the like to be easily hung for a work attachment by fitting a guide sheave to the end of the second arm at a position of the predetermined eccentricity, and keeping the suspension position of a wire constant at all times, regardless of arm posture. CONSTITUTION:The shaft 14 of a guide sheave 10A is fixed to the side of an extension arm 20 approximately coaxially with the set shaft 6 of a vibro- hammer 5. In this case, the aforesaid shaft 14 is positioned with the predetermined amount of eccentricity and after the determination of diameter of the guide sheave 10A, so as to avoid the contact of the vibro-hammer 5 with a wire 11. Also, wire stoppers 20 and 30 are so fitted to the shaft 14 as to sandwich the guide sheave 10A and in such a way as to be rotatable, according to the sheave winding angle of the wire 11. According to the aforesaid construction, the suspension position of the wire 11 can be kept constant, the wire 11 can be prevented from interference with a work attachment, and a hanging work of a pile or the like can be quickened.

9. 发明专利

JP2000203794A SYNCHRONIZATION CONTROL DEVICE FOR HYDRAULIC ACTUATOR 失效
公开(公告)号：JP2000203794A
公开(公告)日：2000-07-25
申请号：JP678599
申请日：1999-01-13
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： FUNATO KOJI , DATE KENICHIRO , ISHIDA KAZUHISA , OCHIAI MASAMI , IGARASHI TERUO , NAKAYAMA AKIRA
IPC分类号： E02F3/47 , B66C13/23 , B66D1/44
摘要： PROBLEM TO BE SOLVED: To synchronously drive a winch while properly keeping the ratio of load to be applied to respective hydraulic motors. SOLUTION: Load detectors 11A, 11B and rotational amount detectors 12A, 12B are respectively provided on sheaves 64, 65 of a main winding winch 4 and an auxiliary winding winch 5 to detect tension T4, T5 and the moving speeds v4, v5 of respective ropes 41, 51. The deviation amount (the load deviation dT) from a proper value L of the ratio of T5/T4 of load to be applied to respective hydraulic motors 2A, 2B is calculated on the basis of the detected tension T4, T5, and target speeds v4", v5" of respective ropes 41, 51 are calculated on the basis of the load deviation dT. Control signals I4, I5 are output from a controller 20 to electromagnetic proportional pressure reducing valves 71 to 74 on the basis of the speed deviation dv between the detected moving speeds v4, v5 of the ropes 41, 51 and the target speeds v4", v5", and therefore, the rope speeds v4, v5 are controlled (the speed compensation) so as to be the target speeds v4", v5", and the ratio T5/T4 of load which act on respective hydraulic motors 2A, 2B is kept to a proper value L.

10. 发明专利

JPH09112178A WINCH CONTROL DEVICE OF EXCAVATING MACHINE 失效
公开(公告)号：JPH09112178A
公开(公告)日：1997-04-28
申请号：JP27143495
申请日：1995-10-19
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： DATE KENICHIRO , MIYATA KENICHI
IPC分类号： E21B19/084 , E21B3/02 , E21B3/035 , E21B7/00 , E21B19/08
摘要： PROBLEM TO BE SOLVED: To reduce loads of an operator in excavating work by detecting the tension of support ropes and controlling it between the lower limit value and the upper limit value in the period of operating the support hydraulic winch in the lowering direction. SOLUTION: When the rope tension detected by a load meter is determined to be a lower limit value or less, the lower side electrode valve 35L is turned on, and the control valve 12 is shifted from the position L side to the neutral position N, so that the lowering speed slows down and the rope tension increases. On the other hand, when the rope tension detected is beyond the lowering limit value, the lowering side electrode valve 35L is turned off, and the control valve 12 is shifted toward the position L side so as to be increased in its opening area, thus, the lowering speed slows down so that the rope tension decreases. When the detected value of rope tension is in the region between the lower limit value and the upper limit value, the electrode valve 35L is kept off. In this instance, pilot pressure in a pipe passage 33L accords to the manipulated variable of a pilot operating device 32.

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