Hose pump especially for the pumping of concrete

摘要

The invention proceeds from a concrete hose pump in which a hose is led in a U-shape through a cylindrical housing having a vacuum, the hose being compressed by means of two rotatable pinch roller carriers preferably provided with elastically covered pinch rollers in repeated cycles against the inner wall of the housing, likewise preferably elastically covered, thereby progressively sealing off the hose cross-section. The elastic coverings are intended to permit the sealing embedding of larger stones in the area of maximum pinching, whilst the vacuum is intended to facilitate the return of the hose into its normal shape after pinching. Although the coverings permit adequate sealing they cause no changes in the repeated overstretching of the hose in the pinching area. The setting up of a vacuum requires a second pump, the weight of which together with that of the covering material adversely affects the mobility of the pump. The vacuum and the insulating effect of the housing covering lead to destructive temperature increases in the hose. In order to avoid these disadvantages it is proposed to design the housing open to the ambient atmosphere, to dispense with the elastic covering of the pinch rollers and the housing wall, to make the hose of such a thickness that the wall thickness is at least half the maximum grain size and to ... Original abstract incomplete. IMAGE