摘要:
A remote controlled demolition robot (10) comprising a controller (17) and at least one control switch (24, 25, 26) for providing a control signal that is received by the controller (17), wherein the controller (17) is configured to control the operation of a corresponding robot part (10a, 11, 14, 15). The controller (17) is further configured to: receive a pressure sensor reading from a pressure sensor (13b) for a proportional hydraulic valve (13a), said pressure sensor reading indicating a standby pressure; provide the control signal to the valve (13a); and increase a signal level of the control signal provided to the valve (13a) until a change in the pressure is detected; determine a starting offset for the valve (13a), said starting offset corresponding to the current signal level of the control signal.
摘要:
The invention relates to an actuating drive for a control valve, in particular a steam turbine control valve, comprising a working cylinder, which has a piston and a piston rod, which is connected to the piston and which forms an actuator for the control valve, wherein the piston bounds a first pressure chamber of the working cylinder and the first pressure chamber has a first pressure connection for introducing a pressurized working medium in order to move the piston together with the piston rod against the force of a spring associated with the working cylinder by the application of pressure; comprising an external working-medium circuit, to which the working cylinder is connected in order to selectively introduce the working medium into or lead the working medium out of the first pressure chamber; wherein the external working-medium circuit has a working-medium pump driven by a motor; and the working-medium pump is connected to the first pressure connection of the first pressure chamber by means of a pressure line connected to a pressure side of the working-medium pump, wherein a check valve or stop valve that opens in the direction of the first pressure connection is provided in the pressure line. The actuating drive according to the invention is characterized in that a short-circuit line branches off from the pressure line before the check valve or stop valve in the flow direction of the working medium, which short-circuit line connects the pressure line to a suction side of the working-medium pump, the working cylinder thus being bypassed, and a short-circuit valve is arranged in the short-circuit line, by means of which short-circuit valve the short-circuit line can be selectively blocked so as to prevent flow of the working medium to the suction side.
摘要:
Disclosed is a hybrid excavator which reduces the impact generated at the start of the operation of the boom cylinder, or the like, of a hybrid excavator. The hybrid excavator according to the present invention comprises: a hydraulic pump motor connected to an electric motor and operated in the forward or reverse direction; a hydraulic cylinder connected to the hydraulic pump motor and operated in an expanding manner; a first and second hydraulic valve installed in a first and second passage, respectively, between the hydraulic pump motor and the hydraulic cylinder, for blocking the first and second passages when switched by an external control signal; a third hydraulic valve installed in the connecting path connected to first and second dividing passages, which are respectively divided and connected to the upstream first and second passages of the first and second hydraulic valves and to the downstream first and second passages of the first and second hydraulic valves, and compensating for or bypassing the flow of the hydraulic fluid when switched in order to cope with the difference in flow generated by the difference in the sectional areas of the large chamber and the small chamber of the hydraulic cylinder; and a first and second pilot chamber supplying pressure to a first and second passage through a pilot signal pressure in order to switch the third hydraulic valve, and which has pilot chambers thereof having different sectional areas.
摘要:
An apparatus for warm up control of an autonomous inverter-driven hydraulic unit comprises a warm up control section 15 and a switch section 16. The warm up control section 15 performs a predetermined process using a current speed and current pressure as input information and outputs a first switch command. The switch section 16 is controlled by the first switch command so as to control on/off of power supplied to a fan motor 7a. The apparatus causes an oil temperature to quickly rise to a level where a hydraulic unit driven by a hydraulic pump can work in an optimum condition.
摘要:
A negative control type hydraulic pump control device mounted on a construction machine such as an excavator is provided. The hydraulic pump control device includes an accumulator storing a control signal pressure, a solenoid valve supplying any one of the signal pressure from the accumulator and a negative signal pressure to the regulator when a solenoid valve is shifted in accordance with applying of the control signal, and an operation lever locking unit turning ON/OFF the control signal applied to the solenoid valve in accordance with a driver's operation, wherein an inclination angle of a swash plate of a hydraulic pump is maintained with a minimum capacity by compensating for the negative signal pressure caused by hydraulic fluid supplied from the accumulator through shifting of the solenoid valve when an engine starts.
摘要:
A method is provided for controlling a hydraulic cylinder in a work machine, which hydraulic cylinder is arranged to move an implement that is subjected to a load, with the hydraulic cylinder being controlled by a hydraulic machine. The method includes detecting that a lifting movement of the implement is to be initiated, and attaining a basic speed of the hydraulic machine before lifting takes place.
摘要:
Eine hydraulisch angetriebene Anordnung zum linearen Bewegen eines Massekörpers (10), bestehend aus zwei parallel zueinander geschalteten doppelt wirkenden Arbeitszylindern (11, 12), wobei der eine Arbeitszylinder als Steuerzylinder (11) für die Steuerung der eine Beschleunigungsphase, eine Fahrphase und eine Bremsphase aufweisenden Bewegung des Massekörpors (10) eingerichtet ist und der andere Arbeitszylinder als Antriebszylinder (12) an einen hydraulischen Akkumulator (25) als Energiespeicher angeschlossen ist derart, dass der Akkumulator (25) während der Beschleunigungsphase des Massekörpers (10) die Antriebsenergie für den Antriebszylinder (12) liefert und der Antriebszylinder (12) in der Bremsphase des Massekörpers (10) als Pumpe zum Aufladen des hydraulischen Akkumulators (25) dient, ist dadurch gekennzeichnet, dass Steuerzylinder (11) und Antriebszylinder (12) jeweils einen Kolben (17) mit einseitiger an den Massekörper (10) gekoppelter Kolbenstange (18) aufweisen und dass Steuerzylinder (11) und Antriebszylinder (12) jeweils mittels hydraulisch voneinander getrennter, unabhängiger und jeweils ein Steuerventil (13) bzw. eine drei Steuerkanten (26) bzw. vier Steuerkanten (26) aufweisender Steuerkreise gesteuert sind.
摘要:
An engine lag down suppressing device of construction machinery, comprising a vehicle body controller (13) having a first torque control means and a second torque control means, and a third torque control means. The first torque control means controls a torque control valve (7) to the minimum pump torque (value: Min) according to a target engine rotational speed (Nr) when the operating device (5) in the non-operated state of an continues for a monitoring time (TX1) to suppress an engine lag down after a specified holing time to hold a torque to a low pump torque is passed when the operating device in the non-operated state is operated. The second torque control means controls the torque control valve (7) to hold the minimum pump torque for a specified holding time (TX2) after the operating device (5) in the non-operated state is operated. The third torque control means comprises a solenoid valve (16) and controls the torque control valve (7) to gradually increase the pump torque with elapse of time from a time when the specified holding time (TX2) is passed based on a specified torque increasing rate (K).