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JP2021055750A |
To propose a feature point extraction device capable of easily determining deterioration of a hydraulic system.A feature point extraction device comprises an extraction unit (12) into which time series data of pressure and/or a flow rate...
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JP6856065B2 |
Provided is a hydraulic system with which an operator can safely perform work during an emergency operation even in the event that an electromagnetic proportional valve itself has failed. This hydraulic system is provided with a hydrauli...
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JP6854390B1 |
To provide a technique for detecting clogging of a filter due to chips more reliably than before. A machine tool capable of processing a work discharges a storage tank for storing coolant and a coolant stored in the storage tank toward c...
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JP2021050777A |
To provide a device which is equipped with an actuator, and can simply and properly determine whether or not abnormality occurs in the actuator.A device is equipped with an actuator which includes a cylinder supplied with a fluid and a p...
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JP6852077B2 |
A hydraulic apparatus includes a first valve manifold that provides a shutdown capability and a second valve manifold that provides an overspeed control capability. The hydraulic apparatus advantageously further employs a hydraulic appli...
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JP6851484B2 |
An air treatment unit for a brake system of a utility vehicle includes a control valve connection for pneumatically coupling the air treatment system to at least one control valve connected upstream of a wheel brake cylinder of the brake...
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JP6848874B2 |
First, the pressure of oil within an oil passage in a control valve device is measured. Then, an amplitude and period of pressure fluctuations are detected on the basis of an obtained measurement result, and an oil vibration state or an ...
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JP2021038787A |
To provide a hydraulic system of a construction machine that can invalidate operation on an operation device without using a solenoid valve dedicated to the invalidation of the operation on the operation device.A hydraulic system 1 accor...
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JP2021032319A |
To provide a hydraulic system of a construction machine capable of disabling operations on an operation device without using a dedicated solenoid valve for disabling the operations on the operation device.A hydraulic system 1A comprises ...
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JP2021011929A |
To provide a hydraulic supply device which can predict opening failure of a check valve more accurately to deal with the opening failure more quickly.A hydraulic supply device includes: a mechanical oil pump 1 which is driven by a drivin...
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JP2021011826A |
To provide an operating machine which can detect a pressure state of an operation chamber without installing a pressure sensor in the operation chamber.An operating machine comprises a cylinder, a piston which forms an operation chamber ...
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JP6819566B2 |
A wear detection method and system for a linear actuator such as a pneumatic cylinder, a hydraulic cylinder, an electric cylinder or the like. A physical amount detection sensor 9 is mounted on a linear actuator in which a push-pull memb...
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JP6815267B2 |
A hydraulic system equipped with: an electromagnetic proportional valve connected to a regulator via a secondary pressure line and connected to an auxiliary pump via a primary pressure line; an emergency line that branches from the prima...
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JP6815881B2 |
It is correctly determined whether or not a flow rate control valve is in an abnormal state due to working fluid leakage. A fluid pressure drive apparatus (1) comprises: the flow rate control valve having a first movable part and control...
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JP6816764B2 |
Provided is a failure detection device which is capable of automatically detecting a failure of a hydraulic pilot circuit following a normal lever operation. The failure detection device is a failure detection device of a pilot circuit, ...
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JP6816762B2 |
Provided is a failure diagnosis device capable of surely finding failure of an unload circuit of a hydraulic system. The unload circuit includes a pump oil passage that connects between a hydraulic pump and a direction control valve, a t...
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JP6809322B2 |
To solve a problem that, in a hydraulic-driven extrusion press, a temperature of an apparatus used for a hydraulic device such as a hydraulic pump is raised by the passage resistance of oil (leak amount) flowing from an annular clearance...
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JP6799480B2 |
To actuate a hydraulic actuator even in the case where a solenoid proportional valve for unloading valve fails and a secondary pressure of the solenoid proportional valve becomes zero.A hydraulic system includes: an operation device 4; a...
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JP6802735B2 |
To detect deterioration of a sealing function in a seal area in a fluid pressure device before fluid leaks to the outside.In a main seal 13 for sealing a rod side chamber 5 to which the fluid pressure is applied, a fluid leakage detector...
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JP6783490B1 |
To provide a drive device and a fluid pressure drive valve capable of detecting a state inside a cylinder and improving the accuracy of abnormality diagnosis and predictive maintenance. A drive device 12 is provided with a cylindrical cy...
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JP6778970B1 |
To provide a remote state monitoring device for a hydraulic cylinder capable of long-term operation with a dry battery power source. A remote state monitoring device 90 transmits a sensor 40 for detecting the state of a hydraulic cylinde...
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JP6780313B2 |
To provide a boosting device for a vehicle for high-lift work capable of cancelling a boosted state without the necessity to separately perform an operation even in the case where a failure occurs in detection means for detecting a press...
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JP6781117B2 |
An automatic brake subsystem (24) includes second accumulators (25F, 25R), a front second line (28) and a rear second line (29), second brake valves (30F, 30R), a first solenoid switching valve (32), first shuttle valves (33F, 33R), and ...
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JP6775710B2 |
A degradation detection system includes: a storage that stores measured values of command pressure and measured values of response pressure; and a simulator that calculates, using a physical model, the response pressure in accordance wit...
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JP6772341B2 |
To provide a preferable fluid pressure device and a method for actuating the same.The disclosure comprises a fluid pressure apparatus and a method for double actuation of a fluid pressure device. Some apparatus comprises a fluid pressure...
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JP2020148338A |
To provide an abnormality detection unit for a hydraulic device, which has further improved detection accuracy.An abnormality detection unit 104 includes: a monitoring part 504 that is connected to a solenoid valve 118 with a spool posit...
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JP6740684B2 |
Provided is a crane that is capable of protecting a hydraulic cylinder by suppressing operation of the hydraulic cylinder when the hydraulic cylinder is in poor connection with a hydraulic circuit. A crane (1) provided with a derricking ...
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JP2020118167A |
To provide a monitoring device capable of inspecting the situation of the device without exchanging a conventional oil pressure gauge or oil level gauge.A monitoring device 1 comprises: an imaging section 10 for imaging an oil level gaug...
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JP6736155B2 |
To provide a means capable of quickly actuating an urgent hydraulic supply device, moreover, a hydraulic driving device even when there is no operator in the site in such a case that supply of electric power to an actuation oil supply de...
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JP6731373B2 |
[Subject] To provide a construction machine that incorporates a hydraulic closed circuit system capable of suppressing, even where a selector valve is sticked in an open state by a failure of the selector valve or a control system theref...
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JP6726127B2 |
This hydraulic system comprises: an operation device; a control valve that, the larger the operation signal output from the operation device, increases the opening area of a passage that supplies hydraulic oil to a hydraulic actuator; a ...
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JP6721424B2 |
An electro hydrostatic actuator (EHA) (102) comprises a hydraulic pump (106) and an electric motor (104) driving the hydraulic pump (106) to supply hydraulic fluid to a hydraulic actuator (112). The hydraulic pump (106) comprises an inle...
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JP6717880B2 |
To provide a turning driving device that can ensure suppression of the entry of a turning body into a work limited area and issue an appropriate warning to an operator.The turning driving device comprises: a neutral brake-type control va...
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JP6715018B2 |
A method includes receiving pump cycle location data (144) associated with a fluid power system (102) of an aircraft. The fluid power system (102) includes a plurality of pumps (104), including at least a first pump (106), a second pump ...
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JP6710150B2 |
This construction machine includes a first hydraulic drive device that is driven by a first prime mover and a second hydraulic drive device that is driven by a second prime mover. The first hydraulic drive device has a first closed circu...
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JP6694480B2 |
A fluid leakage detection system includes: a measurement unit configured to detect leakage of working oil in a hydraulic cylinder; and a controller configured to acquire a measurement result from the measurement unit, wherein the control...
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JP6689525B2 |
To provide a hydraulic working machine capable of preventing working oil from being overheated by arranging an oil cooler for an emergency escaping unit and operating the oil cooler for an emergency escaping unit together with an oil coo...
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JP6683641B2 |
To automatically change the flow rate of hydraulic fluid supplied to a hydraulic actuator for attachment drive according to the type of attachment attached to a front work machine.When an operation valve 14 for an attachment is operated ...
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JP6681039B2 |
To provide means which enables a user to accurately grasp occurrence of leakage of a hydraulic oil of a hydraulic oil supply/discharge device for supplying and discharging the hydraulic oil to a hydraulic cylinder and a leakage amount of...
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JP6670167B2 |
To quickly determine malfunction of an accumulator switch valve with a simple constitution in a pressure accumulation device of a hydraulic working machine.A pressure accumulation device 6 includes an accumulator 28 connected to an oil p...
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JP6659476B2 |
An electro hydrostatic actuator (EHA) (102) comprises a hydraulic pump (106) and an electric motor (104) driving the hydraulic pump (106) to supply hydraulic fluid to a hydraulic actuator (112). The hydraulic pump (106) comprises an inle...
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JP6654521B2 |
Provided is a construction machine capable of detecting a stuck-open state of a surplus flow control valve in real time during operation without involving a reduction in the operational speed. The construction machine is equipped with: a...
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JP6643393B2 |
A fluid leakage detection system has a detection space to which working oil leaked out through a rod seal is guided; the rod seal being configured to seal an annular gap between a piston rod and a cylinder head; a sensor unit configured ...
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JP2020020397A |
To provide a work machine capable of suppressing erroneous determination on clogging of a hydraulic oil filter due to the difference of a flow rate of hydraulic oil flowing in the hydraulic oil filter, to determine the clogging of the hy...
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JP6641852B2 |
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JP6640619B2 |
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JP6636875B2 |
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JP6636795B2 |
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JP6622566B2 |
A liquid leakage detection device according to the present invention includes a sliding contact member (S) that includes an elastic portion (10), is movable with respect to a cylinder (1) filled with liquid in an axial direction, and is ...
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JP6618398B2 |
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