公开(公告)号：US11505979B2

公开(公告)日：2022-11-22

申请号：US16494795

申请日：2018-02-26

申请人： DN Solutions Co., Ltd.

发明人： Young-Jeon Cho

IPC分类号： E05F15/56 ,  F15B11/044 ,  B23Q11/08 ,  F15B20/00

摘要： A pneumatic control device of auto door includes a first directional control valve configured to control a direction of a compressed air supplied to a door cylinder for opening and closing a door, a door detection sensor configured to detect an open/close state of the door, first and second exhaust lines respectively connected to first and second outlet ports of the first directional control valve, and second directional control valves installed in the first and second exhaust lines respectively to operably exhaust the compressed air exhausted from the first and second outlet ports according to an emergency stop signal, and capable of changing positions to reduce an exhaust speed of the compressed air in case that the door is not completely open or closed when an operation signal is generated after the emergency stop signal.

公开(公告)号：US11326627B2

公开(公告)日：2022-05-10

申请号：US16938221

申请日：2020-07-24

申请人： DANFOSS POWER SOLUTIONS II TECHNOLOGY A/S

发明人： Michael Berne Rannow ,  Meng Wang

IPC分类号： F15B11/00 ,  E02F9/22 ,  B66C13/06 ,  E04G21/04 ,  F15B11/044

摘要： A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic cylinder (110), first and second counter-balance valves (300, 400), and first and second control valves (700, 800). A net load (90) is supported by a first chamber (116, 118) of the hydraulic cylinder, and a second chamber (118, 116) of the hydraulic cylinder may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first control valve may apply a holding pressure and thereby hold the first counter-balance valve closed and the second counter-balance valve open.

公开(公告)号：US11261583B2

公开(公告)日：2022-03-01

申请号：US16556366

申请日：2019-08-30

申请人： TAKEUCHI MFG. CO., LTD.

发明人： Tomonori Sato

IPC分类号： E02F9/22 ,  F16H61/47 ,  E02F9/20 ,  F16H61/4035 ,  F15B11/16 ,  F15B11/044 ,  F15B7/00 ,  F16H61/42

摘要： To provide a traveling control mechanism and a traveling control method capable of controlling a traveling mechanism taking into consideration operation contents of a remote control valve. The problem is solved by a traveling control mechanism comprising a remote control valve (21, 22, 23, 24), a pressure adjusting solenoid valve (61, 62), a setting mechanism (70), and a controller (60). The traveling mechanism (8) allows a traveling speed to be switched between a high speed and a low speed in accordance with an operation amount of the remote control valve (21, 22, 23, 24). An HST circuit (30) is provided with a pump (31, 32) and a traveling motor (33), the pump (31, 32) connects to a pilot line (41, 42, 43, 44) allowing a hydraulic oil supplied from the remote control valve (21, 22, 23, 24) to flow therethrough, a pressure sensor (45) is attached to the pilot line (41, 42, 43, 44), and a rotation sensor (65) is attached to the traveling motor (33). The controller (60) controls a pressure of the hydraulic oil supplied from the remote control valve (21, 22, 23, 24) independently of a manual operation of the remote control valve (21, 22, 23, 24), on the basis of a setting signal, a pressure signal, and a rotation speed signal. The remote control valve (21, 22, 23, 24) controls a flow rate of the hydraulic oil discharged from the pump (31, 32) by changing or keeping constant the pressure inside the pilot line (41, 42, 43, 44).

公开(公告)号：US20220055872A1

公开(公告)日：2022-02-24

申请号：US17434136

申请日：2020-02-21

申请人： TADANO LTD. ,  National University Corporation YOKOHAMA National University

发明人： Kazushi SANADA ,  Kazuya TANIZUMI ,  Shinji NOGUCHI ,  Naoto KAWABUCHI

IPC分类号： B66C13/20 ,  B66C23/00 ,  B66C23/86 ,  F15B15/20 ,  F15B11/05 ,  F15B11/042 ,  F15B11/044

摘要： A work vehicle includes: an operation tool that is operated by an operator; and a controller that determines a target flow rate for hydraulic oil fed to a hydraulic device on a basis of the amount of operation of the operation tool. The controller calculates a bleed-off target flow rate on a basis of the flow rate of hydraulic oil fed from a hydraulic oil pump and the target flow rate for hydraulic oil fed to the hydraulic device, calculates a bleed-off throttle differential pressure on a basis of a pressure of hydraulic oil fed from the hydraulic oil pump and a pressure of hydraulic oil in a hydraulic oil tank, calculates a bleed-off target opening area on a basis of the bleed-off target flow rate and the bleed-off throttle differential pressure, and controls a hydraulic oil control valve such that the bleed-off target opening area is achieved.

公开(公告)号：US11230821B2

公开(公告)日：2022-01-25

申请号：US17268717

申请日：2019-07-11

申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

发明人： Akira Kanazawa ,  Hidekazu Moriki ,  Shinya Imura ,  Yasutaka Tsuruga ,  Takaaki Chiba

IPC分类号： E02F9/22 ,  F15B11/028 ,  F15B11/042 ,  F15B11/044 ,  F15B19/00

摘要： A construction machine that precisely enables derivation of the operation characteristics of hydraulic actuators in a high-velocity area with less calibration operation is provided. A controller (10) has a calibration mode in which the controller (10) derives operation characteristics (α(xs)) representing a relation among a spool position (xs) of a meter-in valve (8a1), an operation velocity (Va) of a hydraulic actuator (4a), and a differential pressure (ΔP) across the meter-in valve (8a1), and is configured to, in a case where the spool position (xs) of the meter-in valve (8a1) has changed in a direction to increase the opening area of the meter-in valve (8a1) in the calibration mode, output a command signal to increase the opening area of a bleed-off valve (8b1) to a bleed-off solenoid proportional pressure-reducing valve (8b2) as a command signal to reduce the differential pressure (ΔP).

公开(公告)号：US11215201B2

公开(公告)日：2022-01-04

申请号：US16366150

申请日：2019-03-27

申请人： KUBOTA CORPORATION

发明人： Yuji Fukuda ,  Keigo Honda

IPC分类号： F15B11/024 ,  E02F9/20 ,  E02F9/22 ,  F15B11/044

摘要： A hydraulic system includes a hydraulic pump, a first hydraulic actuator, a second hydraulic actuator, a first control valve to control the first hydraulic actuator, a second control valve to control the second hydraulic actuator, the second control valve being arranged on a downstream side of the first control valve, and a discharge fluid tube in which the operation fluid flows. The hydraulic system further includes a first fluid tube in which a return fluid flows toward the second control valve. The hydraulic system further includes a second fluid tube in which a supply fluid flows toward the first hydraulic actuator, a third fluid tube coupling the first fluid tube to the discharge fluid tube, and a fourth fluid tube in which the return fluid flows toward the second fluid tube, the fourth fluid tube being connected to the first fluid tube.

公开(公告)号：US20210131454A1

公开(公告)日：2021-05-06

申请号：US17251093

申请日：2019-06-07

申请人： SMC CORPORATION

发明人： Gohei HARIMOTO ,  Mitsuru SENOO ,  Yuto FUJIWARA

IPC分类号： F15B11/06 ,  F15B11/024 ,  F15B11/044

摘要： A first fluid circuit is a fluid circuit of an air cylinder provided with an air cylinder with a first air chamber and a second air chamber that are defined by a piston; a switching valve that is switched between the drive step and return step of the piston; a first flow channel between the first air chamber and the switching valve; and a second flow channel between the second air chamber and the switching valve. Two speed control valves are provided in series in the second flow channel.

公开(公告)号：US10974936B2

公开(公告)日：2021-04-13

申请号：US15754421

申请日：2016-08-16

申请人： XCMG EUROPEAN RESEARCH CENTER GMBH

发明人： Torsten Verkoyen ,  Heinz Henning Hoppmann ,  Christian Stammen

IPC分类号： B66C13/20 ,  B66D1/44 ,  B66D1/08 ,  B66D5/26 ,  B66C23/00 ,  F15B11/044

摘要： A hydraulically actuated liftable and lowerable hook of a crane has a hydraulic system comprises at least one working machine with a hydraulic motor driving a winch. At least one drive machine comprising a pump is connected directly or indirectly to at least one of the working machines by means of two connections via corresponding working lines, which serve as a feed or return depending on the operating state of the working machine. A lowering brake valve is provided in one working line and is connected to the other working line via a control line such that the lowering brake valve is displaceable against a restoring force by pressure, which prevails in the other working line and is forwarded via the control line, from the blocking position of said valve into a through-flow position for lowering the hook by means of a primary winch.

公开(公告)号：US20210010490A1

公开(公告)日：2021-01-14

申请号：US16938221

申请日：2020-07-24

申请人： Eaton Intelligent Power Limited

发明人： Michael Berne RANNOW ,  Meng WANG

IPC分类号： F15B11/00 ,  E02F9/22 ,  B66C13/06 ,  E04G21/04 ,  F15B11/044

摘要： A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic cylinder (110), first and second counter-balance valves (300, 400), and first and second control valves (700, 800). A net load (90) is supported by a first chamber (116, 118) of the hydraulic cylinder, and a second chamber (118, 116) of the hydraulic cylinder may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first control valve may apply a holding pressure and thereby hold the first counter-balance valve closed and the second counter-balance valve open.

公开(公告)号：US10890199B2

公开(公告)日：2021-01-12

申请号：US15624570

申请日：2017-06-15

申请人： Liebherr-Mining Equipment Colmar SAS

发明人： Philipp Hahn ,  Volker Gliniorz ,  Guillaume Bonnetot

IPC分类号： F15B21/14 ,  F15B1/02 ,  F15B1/033 ,  F15B11/044 ,  F15B11/16

摘要： An apparatus for recuperating hydraulic energy in a working machine includes at least one first differential cylinder piston device with a differential cylinder and separate rod and bottom sides, and at least one hydraulic accumulator which is hydraulically connectable with the differential cylinder piston device. The potential energy of the differential cylinder piston device retracting under pressing load is at least partly storable in the hydraulic accumulator. The rod and bottom sides are connectable with each other via at least one brake valve for recirculating hydraulic fluid from the bottom side into the rod side.