Abstract: A pump having an electric motor (14) and an electronic monitoring circuit (30) arranged in a housing part (26) of the motor, for monitoring and recording operating parameters of the pump, one of the operating parameters being the current consumption of the pump, the monitoring circuit (30) having a digital current and voltage measuring circuit (34) which is integrated in a semiconductor component and has at least one Hall sensor (36) for measuring current.

Abstract: A pump having a cutting wheel (20) and a pre-cutter (26) driven by a shaft portion (24) that projects axially from the cutting wheel (20) and has a plurality of wings (28) that extend radially from the shaft portion (24), wherein the wings (28) differ in their axial arrangement on the shaft portion (24).

Abstract: A method for treating a liquid (16) that contains chippings in a collecting basin (10), in which the liquid (16) is sucked from the bottom (12) of the collecting basin (10) by a chopper (18, 18?) that is immersed in the liquid and has a rotating cutting wheel (32), and the liquid is directly recirculated into the collecting basin when the chippings have been chopped by the chopper.

Abstract: A pump having a cutting wheel and a pre-cutter (26) for cutting chippings that are contained in the medium pumped by the pump, the pre-cutter being driven by a shaft portion that projects axially from the cutting wheel and having a plurality of wings (28), the pre-cutter being surrounded by a crest of anvil blocks (32) at which the free ends of the wings (28) move past in a little distance when the pre-cutter rotates, wherein the anvil blocks are configured as counter-blades (32) that are held exchangeably at a blade carrier (34) that surrounds the pre-cutter (26) at least on a part of its periphery.

Abstract: A coolant system for machine tools, includes a pump (12) for the coolant, at least one consumer (10), a pressure sensor (24) for detecting an actual pressure (Pi) in the coolant system, a feedback control device (22) acting upon the pump (12) for regulating the pressure in the coolant system to a target pressure (Ps), and a limiting valve (26) for limiting the pressure of the coolant supplied to the consumer, wherein in that the opening pressure (Plim) of the limiting valve (26) is variable and the feedback control device (22) is adapted to adjust the opening pressure in accordance with the target pressure (Ps) such that it is always a certain amount larger than the target pressure.

Abstract: A pump having a cutting wheel and a pre-cutter (26) for cutting chippings that are contained in the medium pumped by the pump, the pre-cutter being driven by a shaft portion that projects axially from the cutting wheel and having a plurality of wings (28), the pre-cutter being surrounded by a crest of anvil blocks (32) at which the free ends of the wings (28) move past in a little distance when the pre-cutter rotates, wherein the anvil blocks are configured as counter-blades (32) that are held exchangeably at a blade carrier (34) that surrounds the pre-cutter (26) at least on a part of its periphery.

Abstract: A pump having a cutting wheel (20) and a pre-cutter (26) driven by a shaft portion (24) that projects axially from the cutting wheel (20) and has a plurality of wings (28) that extend radially from the shaft portion (24), wherein the wings (28) differ in their axial arrangement on the shaft portion (24).

Abstract: A coolant system for machine tools, includes a pump (12) for the coolant, at least one consumer (10), a pressure sensor (24) for detecting an actual pressure (Pi) in the coolant system, a feedback control device (22) acting upon the pump (12) for regulating the pressure in the coolant system to a target pressure (Ps), and a limiting valve (26) for limiting the pressure of the coolant supplied to the consumer, wherein in that the opening pressure (Plim) of the limiting valve (26) is variable and the feedback control device (22) is adapted to adjust the opening pressure in accordance with the target pressure (Ps) such that it is always a certain amount larger than the target pressure.

Abstract: A pump includes a cutting impeller (38) and a pre-chopper (50) driven by a shaft portion (46) that projects axially from the cutting impeller (38), with the pre-chopper (50) being surrounded by an intake port (22) of the pump, the intake port having, at least on a part of its length, in the vicinity of the pre-chopper, a non-circular internal cross-section.

Abstract: A pump includes a cutting impeller (38) and a pre-chopper (50) driven by a shaft portion (46) that projects axially from the cutting impeller (38), with the pre-chopper (50) being surrounded by an intake port (22) of the pump, the intake port having, at least on a part of its length, in the vicinity of the pre-chopper, a non-circular internal cross-section.