Piston press

Abstract

A piston press in which hydraulic lines ( 32 ) of a hydraulic cylinder ( 19 ) move a ram plate ( 21 ) up and down with relatively large diameters, and in which use is made of a hydraulic pump ( 33 ) with a continuously adjustable delivery flow, in particular with constant output regulation, making it possible to move the ram plate ( 21 ) more quickly in the unloaded or less loaded state, by which means the operating time is shortened considerably as compared with known piston presses ( 10 ).

What is claimed is:  
     
         1 . Piston press for pressing liquids out of laundry ( 11 ) comprising a press ram ( 18 ) which has a hydraulic cylinder ( 19 ) and a ram plate ( 21 ) arranged at the free end of a piston rod ( 20 ) of the hydraulic cylinder ( 19 ), and a hydraulic pump ( 33 ) for supplying at least the hydraulic cylinder ( 19 ) of the press ram ( 18 ) with hydraulic fluid, characterized in that the hydraulic pump ( 33 ) is designed in such a way that its delivery flow can be adjusted continuously.  
     
     
         2 . Piston press according to  claim 1 , characterized in that the delivery flow of the hydraulic pump ( 33 ) can be adjusted as a function of the loading on the hydraulic cylinder ( 19 ) or the ram plate ( 21 ).  
     
     
         3 . Piston press according to  claim 1 , characterized in that the delivery flow of the hydraulic pump ( 33 ) is regulated as a function of the output.  
     
     
         4 . Piston press according to  claim 3 , characterized in that the delivery flow of the hydraulic pump can be regulated in such a way that the output of the hydraulic pump ( 33 ) is always approximately constant.  
     
     
         5 . Piston press for pressing liquids out of laundry ( 11 ) comprising a press ram ( 18 ) which has a hydraulic cylinder ( 19 ) with a ram plate ( 21 ) assigned to the latter, and a hydraulic pump ( 33 ) for supplying at least the hydraulic cylinder ( 19 ) of the press ram ( 18 ) with hydraulic fluid, characterized in the hydraulic lines ( 32 ) between the hydraulic cylinder ( 19 ) and the hydraulic pump ( 33 ) and a tank for hydraulic fluid have a relatively large cross section.  
     
     
         6 . Piston press according to  claim 5 , characterized in that the diameter of the hydraulic lines ( 32 ), including the hydraulic connections, is greater, as compared with the piston diameter of the hydraulic cylinder ( 19 ), then the usual standardized diameter of the hydraulic lines ( 32 ) and their connections.  
     
     
         7 . Piston press according to  claim 5 , characterized in that the free flow cross section at least of the hydraulic lines ( 32 ) is at least {fraction (1/15)} of the piston diameter of the hydraulic cylinder ( 19 ).  
     
     
         8 . Piston press according to  claim 5 , characterized in that the diameter of the hydraulic line ( 32 ) on the piston side ( 31 ) is at least ⅕ of the piston diameter of the hydraulic cylinder ( 19 ).  
     
     
         9 . Piston press according to  claim 5 , characterized in that the free flow cross section of the hydraulic lines ( 32 ) and of the connections on the piston side ( 31 ) of the hydraulic cylinder ( 19 ) is greater than on the piston-rod side ( 34 ) of the hydraulic cylinder ( 19 ).  
     
     
         10 . Piston press according to  claim 5 , characterized in that the temperature of the hydraulic fluid can be regulated in such a way that the temperature of the hydraulic fluid approximately maintains a predefined value.  
     
     
         11 . Piston press for pressing liquids out of laundry ( 11 ) comprising a press frame ( 17 ) which has a base ( 12 ) and a press ram ( 18 ) which can be moved up and down, and a press basket ( 23 ) for holding the laundry ( 11 ), characterized in that the base ( 12 ) has at least one storage container for the liquid pressed out of the laundry ( 11 ).  
     
     
         12 . Piston press according to  claim 11 , characterized in that the volume of the at least one storage container ( 36 ) is dimensioned to be larger than the maximum amount of liquid which accumulates as the laundry ( 11 ) is pressed in the press basket ( 23 ).  
     
     
         13 . Piston press according to  claim 12 , characterized in that the at least one storage container has a volume which is at least suitable to accommodate twice the quantity of liquid which accumulates as the laundry ( 11 ) is pressed in the press basket ( 23 ).  
     
     
         14 . Piston press according to  claim 11 , characterized in that each storage container ( 36 ) is formed by constructing the base ( 12 ) as a frame tank ( 35 ).  
     
     
         15 . Piston press according to  claim 14 , characterized in that an upper side of the base ( 12 ) is formed by a top wall ( 13 ) of the frame tank ( 35 ) which, at least in the region of the press basket ( 23 ), has drainage holes ( 14 ).  
     
     
         16 . Piston press according to  claim 15 , characterized in that at least part of the storage container ( 36 ) is arranged in the region under the drainage holes ( 14 ).  
     
     
         17 . Piston press for pressing liquids out of laundry ( 11 ) comprising a press frame ( 17 ) which has a base ( 12 ) and a press ram ( 18 ) which can be moved up and down, and a press basket ( 23 ) for holding the laundry ( 11 ), characterized in that at least one analogue distance measuring device is assigned to the press frame ( 17 ) to determine the position of at least the press ram ( 18 ).  
     
     
         18 . Piston press according to  claim 17 , characterized in that a further analogue distance measuring device is provided, by means of which the position of the press basket ( 23 ) can be determined.  
     
     
         19 . Piston press according to  claim 17 , characterized in that the respective distance measuring device is assigned to a press yoke ( 16 ) of the press frame ( 17 ).  
     
     
         20 . Piston press according to  claim 17 , characterized in that the respective distance measuring device is designed as an acoustic distance sensor.  
     
     
         21 . Piston press according to  claim 20 , characterized in that the ram plate ( 21 ) of the press ram ( 18 ) is assigned at least one reflector for the ultrasound waves from the acoustic distance sensor.  
     
     
         22 . Piston press according to  claim 20 , characterized in that the press basket ( 23 ) is assigned at least one reflector for the ultrasound waves from the acoustic distance sensor.  
     
     
         23 . Piston press according to  claim 20 , characterized in that the acoustic distance sensor is an ultrasound sensor ( 40 ).