Method for operating a hydraulic pump arrangement, and hydraulic pump arrangement

Abstract

A hydraulic pump arrangement for a portable hydraulic tool operates energy-independently or dependent on a power network. The hydraulic pump arrangement detachably connects via hose to the hydraulic tool, is driven by an electrical energy source and is controlled in a load-dependent manner by changing between a load state and a non-load state. The load state has a first, higher electrical energy supply and the non-load state has a second, lower electrical supply. To increase usage flexibility, usage safety and ease of use, a battery is mounted on the hydraulic pump arrangement to be manually detachable in a receptacle accessible from the outside. A power adapter ( 25 ) connects an electrical cable to a generator ( 29 ). The battery ( 24 ) and the power adapter ( 25 ) have a geometry matching the receptacle ( 26 ), so the hydraulic pump arrangement can be supplied with power via the battery ( 24 ) or the power adapter ( 25 ).

1 . A method for operating a hydraulic pump arrangement of a portable hydraulic tool which operates self-sufficiently in terms of energy, wherein the hydraulic pump arrangement is detachably connected to the hydraulic tool via a hose connection, is driven by an electrical energy source and the hydraulic pump arrangement is controlled load-dependently, wherein switching over from a load state into a non-load state and vice-versa takes place, and wherein a first high electrical energy supply is provided for the load state, and a second low electrical energy supply is provided for the non-load state, the method comprising:
 operating the hydraulic pump arrangement alternately with a power supply, which can be connected to a generator by an electrical cable, or by a battery, with the result that during use the hydraulic pump arrangement can be supplied with electrical energy either via the battery or via the power supply, and the power supply and the battery can be alternately attached to an interface in a manually detachable fashion in that the power supply and the battery can be alternately inserted into a receptacle shaft which is accessible from the outside.   
     
     
         2 . The method as claimed in  claim 1 ,
 wherein   the battery and the power supply have a corresponding receptacle geometry.   
     
     
         3 . The method as claimed in  claim 1 ,
 wherein   alternating current which is generated by the generator is rectified in a region of the power supply or in the power supply.   
     
     
         4 . The method as claimed in  claim 1 ,
 wherein   the hydraulic pump arrangement is operated at a power of at least 800 1000 watts.   
     
     
         5 . The method as claimed in  claim 1 ,
 wherein   at least one control variable, which is dependent as an input variable on the work to be performed by a motor of the hydraulic pump arrangement, is defined for the load-dependent control of the hydraulic pump arrangement, the control variable is assigned a first threshold value at which switching over from the non-load state into the load state takes place, and if appropriate the control variable is assigned a second threshold value at which switching over from the load state into the non-load state takes place.   
     
     
         6 . The method as claimed in  claim 5 ,
 wherein   first and second control variables and, which are dependent as input variables on the work to be performed by the motor of the hydraulic pump arrangement, are defined for the load-dependent control of the hydraulic pump arrangement,   the first control variable is assigned the first threshold value at which switching over from the non-load state into the load state takes place, and   the second control variable is assigned the second threshold value at which switching over from the load state into the non-load state takes place.   
     
     
         7 . The method as claimed in  claim 5 ,
 wherein   after the switching on of the hydraulic pump arrangement but still without movement of the tool the control system keeps the supply of the motor with energy from the electrical energy source at the second low electrical energy supply,   at the start of the movement of the tool the control system switches over the supply of the motor with energy from the electrical energy source to the first high electrical energy supply without an external load effect.   
     
     
         8 . The method as claimed in  claim 1 ,
 wherein   when movement of the tool stops under the load effect switching over takes place from the load state into the non-load state, and when the movement of the tool continues switching over takes place in turn from the non-load state into the load state.   
     
     
         9 . The method as claimed in  claim 1 ,
 wherein   the second threshold value is a variable value and is updated during operation.   
     
     
         10 . The method as claimed in  claim 1 ,
 wherein   the control variable is assigned a third threshold value, and switching over from the load state into the non-load state takes place as a function of the second threshold value and the third threshold value.   
     
     
         11 . The method as claimed in  claim 1 ,
 wherein   the control variable is the motor current.   
     
     
         12 . The method as claimed in  claim 1 ,
 wherein   the control variable is the pressure and/or the motor torque.   
     
     
         13 . The method as claimed in  claim 1 ,
 wherein   the control variable is a time-related value.   
     
     
         14 . A hydraulic pump arrangement for driving an, in particular, portable hydraulic tool, comprising:
 a housing,   a hydraulic pump,   an electric motor for driving the hydraulic pump,   a clutch device for connecting the hydraulic pump to flexible connecting lines for supplying the hydraulic tool with hydraulic fluid,   a control device for load-dependent control of rotational speed of the motor, wherein   the hydraulic pump arrangement is operable with a power supply, which can be connected to a generator by an electrical cable, or by a battery,   wherein   the hydraulic pump arrangement is operated optionally with a power supply for connecting an electrical cable to a generator or to a battery.   
     
     
         15 . The hydraulic pump arrangement as claimed in  claim 14 ,
 wherein   the battery and the power supply have a corresponding receptacle geometry for the receptacle shaft such that during use the hydraulic pump arrangement is optionally supplied with electrical energy either via the battery or via the power supply.   
     
     
         16 . The hydraulic pump device as claimed in  claim 14 ,
 wherein   the power supply has a housing,   the battery has a housing,   the shape of the housing of the power supply and the shape of the housing of the battery are identical at least over part of the housing.   
     
     
         17 . The hydraulic pump device as claimed in  claim 14 ,
 wherein   the receptacle is located on a rear of the hydraulic pump arrangement.   
     
     
         18 . The hydraulic pump device as claimed in  claim 14 ,
 wherein   in the state of use at least half the depth of the respective housing is located inside a rear contour line of the housing of the hydraulic pump arrangement in the receptacle on the rear of the hydraulic pump arrangement.   
     
     
         19 . The hydraulic pump device as claimed in  claim 14 ,
 further comprising:   means for detecting at least one control variable, which is dependent as an input variable on the work to be performed by the motor of the hydraulic pump arrangement,   means for comparing the detected control variable with a first threshold value,   means for comparing the detected control variable with a second threshold value, and   means for switching over the energy supply of the motor for a load state or non-load state as a function of the detected control variable.   
     
     
         20 . The hydraulic pump arrangement as claimed in  claim 14 ,
 wherein   a tank and a tank window are provided on the housing of the hydraulic pump arrangement and an interior of the tank is illuminated.