Abstract:
A method of controlling a hydraulic system (10) having a variable displacement pump (20) operatively coupled to an engine (12). The method includes detecting a speed of the engine, and determining a desired power value of the pump (110). The method also includes identifying an allowable power value that may be expended by the pump at the detected speed (120). The method also includes selecting a pump power value (140). The selected pump power value is the lower of the allowable power value and the desired power value. The method further includes adjusting the pump to deliver the selected pump power value (150).
Abstract:
An apparatus and method for monitoring a reciprocating member of a reciprocating piston compressor is presented. The apparatus and method provide a means for measuring parameters of the reciprocating member, such as road load or cross-head temperature and the like, and wirelessly transmitting the data to a receiver. A mobile assembly is attached to a reciprocating member of the compressor, the mobile assembly having a sensor assembly, a wireless transmitter and a power generation assembly. The sensor assembly measures a parameter of the reciprocating member and generates a representative sensor signal. The wireless transmitter wirelessly transmits a corresponding data signal to a stationary assembly mounted nearby. The power assembly powers the transmitter and sensor assembly. The measured data is used, in conjunction with other measurements, such as a crankshaft encoder, to calculate the work performed by the compressor, the power used by the compressor and other information. The compressor utilization is then optimized based on the gathered information.
Abstract:
Pumping unit (10) for a machine to distribute concrete comprising: a pair of pistons (12, 13) provided with a relative pumping cylinder (22, 23) movable linearly for a determinate travel (S) to feed the concrete to a determinate circuit to distribute the concrete; and a hydraulic command circuit (11) operatively connected to both the pistons (12, 13), to determine an alternate pumping movement of the relative pumping cylinders (22, 23). The pumping unit (10) comprises at least a sensor member (15) operatively associated to at least one of the pistons (12, 13) in order to detect point-by -point one or more data relating to the operating condition of the pumping cylinder (22, 23) during its movement for the whole travel (S). The data comprise at least one of position, speed, stress and direction of movement of the relative piston (12, 13).
Abstract:
A pump drive assembly (10) including a driver (18), a pump drive member (36) driven by the driver (18), and a decoupler (20a) that decouples the drive member (36) from the driver (18) when a force acting upon the drive member (36) exceeds a threshold force. The pump drive member (36) can be a piston rod (36), and the decoupler (20a) can be a magnet (20a) attached to the piston rod (36) and coupled to a magnetically attracted plate (22) driven by the driver (18). When a force resisting movement of the piston rod (36) exceeds the magnetic force coupling the magnet (20a) to the plate (24), the magnet (20a) decouples from the plate (24), and the pumping operation ceases.
Abstract:
Die Erfindung betrifft ein Verfahren zum Betreiben einer Dosierpumpe (12), insbesondere zum Fördern von Brennstoff für ein Fahrzeugheizgerät, wobei die Dosierpumpe einen zum Fördern zwischen einer Anfangsposition und einer Endposition hin- und herbewegbaren Kolben (14) und eine durch Anlegen einer Spannung elektrisch erregbare Antriebseinheit (18) umfasst, mit der folgenden Maßnahme: Steuern und/oder Regeln der Spannung zum Erzeugen einer Effektivspannung, um den Kolben von der Anfangsposition in die Endposition zu überführen, wobei die Effektivspannung in einer Anfangsphase (t0 - t1) ein erstes Maximum (U1) annimmt und in einer anschließenden Zwischenphase (t1 - t2) niedriger als das erste Maximum ist. Erfindungsgemäß ist vorgesehen, dass die Effektivspannung in einer der Zwischenphase nachfolgenden Endphase (t2 - t3) ein zweites Maximum (U3) erreicht. Die Effektivspannung während der Anfangsphase und/oder der Zwischenphase und/oder der Endphase kann beispielsweise jeweils konstant sein oder durch eine Treppenfunktion definiert sein. Die Erfindung betrifft auch eine Vorrichtung mit einer Dosierpumpe (12) und einer Steuer/Regeleinheit (20), wobei die Steuer/Regeleinheit (20) geeignet ist, eine an einer Antriebseinheit (18) der Dosierpumpe angelegte Spannung zu steuern.
Abstract:
A method of controlling a hydraulic system (10) having a variable displacement pump (20) operatively coupled to an engine (12). The method includes detecting a speed of the engine, and determining a desired power value of the pump (110). The method also includes identifying an allowable power value that may be expended by the pump at the detected speed (120). The method also includes selecting a pump power value (140). The selected pump power value is the lower of the allowable power value and the desired power value. The method further includes adjusting the pump to deliver the selected pump power value (150).
Abstract:
Es wird eine Vorrichtung zum dosierten Abfüllen einer Flüssigkeit vorgeschlagen, umfassend mindestens einen mit einem Flüssigkeitszuführkanal (42) versehenen Pumpenblock (14), in dem mindestens eine Abfüllspur ausgebildet ist, die eine Fülldüse (20) und einen Pumpenzylinderraum (22) umfasst, in dem ein mittels einer Bewegungseinheit (26) angetriebener Pumpenkolben (24) axial verschiebbar geführt ist, so dass wahlweise Flüssigkeit aus dem Flüssigkeitszufuhrkanal (42) in den Pumpenzylinderraum (22) angesaugt oder zu der Fülldüse (20) gefördert wird. Zwischen dem Pumpenkolben (24) und der Bewegungseinheit (26) ist ein Kraftmesssensor (32) angeordnet, mittels dessen auf den Pumpenkolben (24) wirkende Zugund Druckkräfte ermittelbar sind.
Abstract:
A pump drive assembly (10) including a driver (18), a pump drive member (36) driven by the driver (18), and a decoupler (20a) that decouples the drive member (36) from the driver (18) when a force acting upon the drive member (36) exceeds a threshold force. The pump drive member (36) can be a piston rod (36), and the decoupler (20a) can be a magnet (20a) attached to the piston rod (36) and coupled to a magnetically attracted plate (22) driven by the driver (18). When a force resisting movement of the piston rod (36) exceeds the magnetic force coupling the magnet (20a) to the plate (24), the magnet (20a) decouples from the plate (24), and the pumping operation ceases.