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公开(公告)号：US11230821B2
公开(公告)日：2022-01-25
申请号：US17268717
申请日：2019-07-11
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).
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公开(公告)号：US11193254B2
公开(公告)日：2021-12-07
申请号：US17255934
申请日：2019-09-03
IPC分类号： E02F9/22 , E02F3/43 , F15B11/028 , F15B11/042 , F15B11/044 , F15B11/05 , F15B11/16
摘要： To provide a construction machine that can highly precisely control branch flows from a hydraulic pump to a plurality of hydraulic actuators without being affected by load conditions. A controller (100) has a meter-out valve control section (140) configured to calculate a target opening area of a second meter-out valve (65a) (65b) according to a pressure difference between a supply pressure and a second meter-in pressure, or calculate a target opening area of a first meter-out valve (55a) (55b) according to a pressure difference between the supply pressure and the first meter-in pressure.
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公开(公告)号：US11920325B2
公开(公告)日：2024-03-05
申请号：US17289365
申请日：2019-12-13
发明人： Akira Kanazawa , Hidekazu Moriki , Takaaki Chiba , Shinya Imura
CPC分类号： E02F9/2228 , E02F9/2203 , E02F9/2285 , F15B11/05 , F15B11/161 , F15B13/025 , E02F9/22 , F15B13/086 , F15B2211/30535 , F15B2211/351 , F15B2211/45 , F15B2211/6336 , F15B2211/78
摘要： A construction machine is provided that can cause each hydraulic actuator to accurately operate according to operation by an operator in combined operation in which a hydraulic fluid of a hydraulic pump is subjected to flow dividing and is supplied to plural hydraulic actuators. A controller 10, in a case of determining that combined operation is being carried out, controls a regulator 7a in such a manner that the delivery flow rate of a hydraulic pump 7 becomes larger than the total target flow rate of plural hydraulic actuators 4a, 5a, and 6a, and controls the respective opening amounts of plural directional control valves 8a1, 8a3, and 8a5 in such a manner that the difference between the respective target flow rates of the plural hydraulic actuators and the respective inflow flow rates of the plural hydraulic actuators sensed by velocity sensors 12 to 14 becomes small.
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公开(公告)号：US12094341B2
公开(公告)日：2024-09-17
申请号：US18016474
申请日：2021-07-27
发明人： Akira Kanazawa , Hiroyuki Yamada , Shiho Izumi , Shinya Imura , Mariko Mizuochi
IPC分类号： G08G1/16
CPC分类号： G08G1/16
摘要： The present invention intends to provide a risk management system that can accurately extract information necessary for analysis of a variety of accidents in which a machine is involved. For this purpose, a controller calculates a main risk that is the degree at which a main factor of an accident contributes to the occurrence of the accident on the basis of an evaluation value of the main factor, and calculates a subsidiary risk that is the degree at which a subsidiary factor of the accident contributes to the occurrence of the accident on the basis of an evaluation value of the subsidiary factor. Furthermore, the controller calculates, as the occurrence risk of the accident, an integrated risk that has a value equal to or larger than the main risk and increases or decreases at a degree lower than the degree of increase or decrease in the subsidiary risk, and, when the integrated risk has exceeded a predetermined threshold, causes a recording device to record parameters measured by measuring devices in a certain time period including a clock time at which the integrated risk has exceeded the predetermined threshold.
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公开(公告)号：US12084841B2
公开(公告)日：2024-09-10
申请号：US17635733
申请日：2020-08-20
发明人： Akira Kanazawa , Hiroyuki Yamada , Shiho Izumi , Shinya Imura
摘要： A construction management device computes a risk indicative of a degree of danger with which an accident occurs on the basis of information relating at least to a position of a worker measured by a worker position measuring device and a worker biometrical information measuring device, information relating at least to a position of a hydraulic excavator measured by a machine body position measuring device, a machine body posture measuring device, a machine front implement posture measuring device, and a machine operator biometrical information measuring device, personal information on a worker and an operator registered in a worker information registration device, and information on a construction environment from an environment information registration device, and outputs the computed risk as a coordinate risk associated with coordinates of the construction environment to a risk display device such that the computed risk is displayed in a map format on the risk display device.
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