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1.发明公开公开(公告)号：US20240343530A1
公开(公告)日：2024-10-17
申请号：US18751759
申请日：2024-06-24
发明人： Junhui ZOU , Guoliang LIU , Wei SHI
CPC分类号： B66C23/54 , F15B11/055 , F15B13/026 , F15B2211/253
摘要： A control method for controlling retraction of a boom is applied to a hydraulic system which combines retraction of the boom by self-weight with retraction of the boom by pressure. The control method includes: when the boom is retracted, controlling the self-weight retraction proportional valve to be at a maximum opening; obtaining an actual speed at which the boom is retracted; controlling a rotation speed of the pressure retraction motor to rise or an opening degree of the pressure retraction proportional valve to increase when the actual speed is less than a preset speed; and controlling the rotation speed of the pressure retraction motor to reduce or the opening degree of the pressure retraction proportional valve to decrease when the actual speed is greater than the preset speed.
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公开(公告)号：US12055162B2
公开(公告)日：2024-08-06
申请号：US18044332
申请日：2021-09-09
IPC分类号： F15B11/17 , E02F9/22 , F15B11/042 , F15B11/044 , F15B11/05
CPC分类号： F15B11/17 , E02F9/2203 , E02F9/2242 , F15B11/042 , F15B11/044 , F15B11/05 , F15B2211/30565 , F15B2211/351 , F15B2211/353 , F15B2211/6309 , F15B2211/6313 , F15B2211/6346 , F15B2211/7135 , F15B2211/7142
摘要： This hydraulic drive system includes: first and second circuit systems; first and second hydraulic pumps; a merge valve that opens and closes a merge passage connecting the hydraulic pumps; an operation device that outputs an operation command corresponding to an amount of operation specifying an amount of actuation of first and second hydraulic actuators; and a control device that controls the merge valve according to the operation command from the operation device. The first circuit system includes: a first meter-in control valve that controls a meter-in flow rate of the working fluid that flows to the first hydraulic actuator; and a first meter-out control valve that controls a meter-out flow rate of the working fluid that is drained from the first hydraulic actuator into a tank. The control device controls an opening degree of the first meter-in control valve and an opening degree of the first meter-out control valve.
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公开(公告)号：US11447930B2
公开(公告)日：2022-09-20
申请号：US17030836
申请日：2020-09-24
发明人： Charles Young , Marty Carpenter , Scott Becker , Douglas Kallas , Matthew Kaldor , Eric Zabel
摘要： A hydraulic work system can include a continuously variable displacement hydraulic pump that is powered by an engine and is in communication with a hydraulic actuator. A run-time displacement of the hydraulic pump for movement of the hydraulic actuator can be controlled based on a speed of the engine.
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公开(公告)号：US11313104B2
公开(公告)日：2022-04-26
申请号：US17282075
申请日：2019-09-27
发明人： Hyeonsik Ahn
摘要： A control system for construction machinery includes a hydraulic cylinder operable by a working oil discharged from a hydraulic pump, a control valve arranged between the hydraulic pump and the hydraulic cylinder to control an operation of the hydraulic cylinder according to a position of a spool therein, the control valve having a first spool position for draining the working oil discharged from a chamber of the hydraulic cylinder to a drain tank, and a pressure compensated valve installed in a return hydraulic line through which the working oil discharged from the control valve at the first spool position is drained to the drain tank, the pressure compensated valve being configured to control a flow rate of the working oil passing through the pressure compensated valve according to a pressure difference between a front end and a rear end of the control valve.
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公开(公告)号：US20200347855A1
公开(公告)日：2020-11-05
申请号：US16643892
申请日：2018-09-05
发明人： Peter BRUCK , Frank SCHULZ
摘要： A valve, in particular for use as a pressure maintenance-type component (38) in hydraulically actuated hoisting devices (2), having a valve housing (54), which has a control port (40) plus a fluid inlet (64) and a fluid outlet (66), and having a regulating piston (68) longitudinally displaceably arranged in the valve housing (54), which regulating piston, against the action of an energy storage device (70), in particular in the form of a compression spring, brings the regulating piston (68) into at least one position forming a fluid-conveying connection between the fluid inlet (40) and the fluid outlet (66) or blocks this connection by means of a control pressure existing at the control port (40), is characterized in that a first diaphragm (88) is arranged in the regulating piston (68), which connects the control port (40) to a receiving space (62) for the energy storage device (70) in a fluid-conveying manner, and in that a second diaphragm (90) is arranged in an intermediate part (72) in the valve housing (54), by means of which the receiving space (62) can be connected to a compensating chamber (92), which connected to the fluid outlet (66) in a fluid-conveying manner (98).
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公开(公告)号：US10676898B2
公开(公告)日：2020-06-09
申请号：US16326754
申请日：2017-12-14
摘要： In a hydraulic drive system of a work machine which drives a plurality of actuators using three or more pumps, for an operation not including traveling, a highly efficient combined operation in a front implement and excellent combined operability of a swing and the front implement are enabled, while for an operation including traveling, a highly efficient traveling operation and a highly efficient combined operation of traveling and the front implement are enabled, and a sufficient operation speed of the front implement is achieved. To this end, each of the flow rates of the first, second, and third pumps (101, 201, 301) can be controlled independently by performing the load sensing control, and in a combined operation for driving a boom (511) and an arm (512), ether one of them is driven by the first pump while the other one is driven by the second pump, and the swing is driven by the third pump. In the traveling operation, the maximum capacity of the first and second pumps is switched to the maximum capacity for the traveling operation and driven by an open center circuit. In a combined operation of traveling and the front implement, the front implement is driven by performing the load sensing control using the third pump.
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公开(公告)号：US10669695B2
公开(公告)日：2020-06-02
申请号：US16327150
申请日：2018-01-31
发明人： Masamichi Ito , Takatoshi Ooki
摘要： There is provided a hydraulic driving device for working machine having operability handling a change in burden weight in a front working device due to a loaded burden and the like when the working machine that accumulates energy in an accumulator and recovers and regenerates the energy performs an operation of lowering the front working device. A hydraulic driving device 5 includes a main pump 101, a boom cylinder 3, a tank 20, a flow rate control valve 6, an accumulator 300, a first differential pressure control valve 201, and a second differential pressure control valve 202. The first differential pressure control valve 201 is located between the boom cylinder 3 and the accumulator 300. The first differential pressure control valve 201 performs control on discharge oil from the boom cylinder 3 such that a differential pressure between before and after the flow rate control valve 6 becomes a target differential pressure. The second differential pressure control valve 202 is located between the accumulator 300 and the tank 20. The second differential pressure control valve 202 performs control on the discharge oil such that a differential pressure between an upstream pressure and a downstream pressure of the flow rate control valve 6 and the first differential pressure control valve 201 becomes the target differential pressure. The first and the second differential pressure control valves 201 and 202 are configured such that the target differential pressure increases according to an increase in pressure of the discharge oil.
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公开(公告)号：US10590962B2
公开(公告)日：2020-03-17
申请号：US15594772
申请日：2017-05-15
IPC分类号： F15B13/04 , F15B11/05 , F16K31/04 , F16K31/122 , F16K11/10 , F16K11/22 , F16K11/16 , F16K31/12
摘要： An example valve section includes: a valve body configured to be fluidly coupled to the source and the actuator; a spool movable in the valve body intermediate the source and the actuator; a pressure compensator valve disposed upstream from the spool and configured to regulate flow received from the source, where the valve body defines (i) a first passage disposed upstream from the spool and configured to fluidly couple the pressure compensator valve to the spool, and (ii) a second passage disposed downstream from the spool and configured to fluidly couple the spool to the actuator; and a counterbalance valve disposed in the second passage downstream from the spool, where the counterbalance valve is opened to permit flow therethrough from the actuator to the spool in response to a pilot pressure derived from the first passage when the spool is shifted from a neutral position.
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公开(公告)号：US10436229B2
公开(公告)日：2019-10-08
申请号：US15504993
申请日：2015-09-29
发明人： Seiji Hijikata , Kouji Ishikawa , Shinya Imura
IPC分类号： F15B21/14 , E02F9/22 , E02F9/20 , F15B11/16 , F15B11/044 , F15B11/05 , F15B21/08 , F15B11/024 , F15B13/07 , E02F3/32
摘要： Provided is a hydraulic drive system for a work machine configured with a single solenoid proportional valve for a regeneration circuit, wherein substantially the same actuator speed can be secured irrespective of whether or not hydraulic fluid discharged from a hydraulic actuator is regenerated for driving of another hydraulic actuator. The hydraulic drive system includes: a regeneration line that connects a bottom-side hydraulic chamber of a hydraulic cylinder 4 to a portion between a hydraulic pump device 50 and a second hydraulic actuator 8, and a regeneration flow rate adjustment device that supplies, at an adjusted flow rate, at least part of the discharged hydraulic fluid to a portion between the hydraulic pump device 50 and the second hydraulic actuator; a discharge flow rate adjustment device that discharges, at an adjusted flow rate, the discharged hydraulic fluid to a tank; one electric drive device 22 that simultaneously controls the regeneration flow rate adjustment device and the discharge flow rate adjustment device; and a control unit 27 that outputs a control command to the electric drive device in such a manner that falling speed of a first driven body does not vary significantly, irrespective of the magnitude of the regeneration flow rate caused by the regeneration flow rate adjustment device.
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公开(公告)号：US10344781B2
公开(公告)日：2019-07-09
申请号：US15501269
申请日：2016-07-29
申请人： Komatsu Ltd.
发明人： Yuta Kamoshita , Tadashi Kawaguchi , Teruo Akiyama , Kenji Oshima , Koji Saito , Noboru Iida
摘要： A control system for controlling a work machine including a working unit including elements and actuators that drives the elements includes: a first hydraulic pump and a second hydraulic pump each of which supplies operating oil to at least one of the actuators; and a control device that calculates a distribution flow rate of operating oil distributed to each of the actuators based on an operating state of the working unit and switches, based on the calculated distribution flow rate, between a first state in which the operating oil supplied from both the first hydraulic pump and the second hydraulic pump is supplied to the actuators and a second state in which the actuator to which the operating oil is supplied from the first hydraulic pump is different from the actuator to which the operating oil is supplied from the second hydraulic pump.
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