摘要:
A method for feeding pasty masses using a pump device which has a piston pump with at least two cylinders, each having one piston, is disclosed. Each cylinder of the pump device is connected to a pre-fill container via an inlet opening and to a feed line via an outlet opening. Pasty mass is fed from the pre-fill container into the respective cylinder during a suction stroke of a cylinder with the inlet opening open and the outlet opening closed, and pasty mass is fed into the feed line during a pump stroke of a cylinder with the outlet opening open and the inlet opening closed. The piston velocity is greater during the suction stroke than during the pump stroke. Near or at the end of the suction stroke, the inlet opening is closed, whereafter the pasty mass is compressed in the cylinder before the outlet opening is opened.
摘要:
In a spool valve for thick matter pumps comprising at least one slide rod running forward and backward which is movable in a guide means and surrounded by a seal, and a drive consisting of working pistons associated with each slide rod, the working pistons each cooperating with one end of the slide rod directed out of a valve casing, and their driving cylinders ending a distance away from the valve casing, the end of the slide rod which runs forward out of the casing being cleaned of adhering thick matter during the backward movement of the piston, the invention provides for the guide means to be disposed on the inside and the seal separate therefrom to be disposed on the outside in front thereof on the valve casing, and for the parts supported loosely on each other in the operative connection between the working piston and the end of the slide rod to provide a gap which is used for assembling and dismounting the seal, the cleaning of the end of the slide rod being effected by the stripping action of the seal.
摘要:
The valve has a shutter mechanism which is movable within a housing and is provided at one end with at least one inlet which is movable across one or more housing openings and at the opposite end with an outlet surrounded by a sealed contact joint which is movable across a delivery pipe opening in the housing. This sealed contact joint surrounds the delivery pipe opening in the housing and contacts either the inside wall of the housing or a face plate arranged on the inside wall of the housing in all intermediate and final positions of the shutter mechanism. With the aim of reducing wear and producing a permanent seal, the sealed contact joint is in the form of a compressible sealing ring with a slotted or kidney-shaped cross-section which serves to wipe the flat and smooth face plate or inside wall of the housing. Moreover the compressible sealing ring is loaded with the internal pressure of the shutter mechanism and is supported outwardly by a flange surrounding the outlet and extending in the conveying direction.
摘要:
A pump for conveying cement comprises two pump cylinders and reciprocating pistons, an input container, a multi-limb oscillating shutter valve arranged in front of the pump cylinders and below the input container, the housing of the valve including a suction connection leading from the input container, two ports connected to the pump cylinders respectively, and an outlet located in the end wall of the housing. Two inlet ports are provided in the housing for placing the suction connection in communication with the ports connected to the pump cylinders respectively. The oscillating shutter is mounted on a horizontal shaft to be movable between two positions, and includes two control limbs, each controlling a different one of said inlet ports, and an outlet control limb the forward edge of which passes over and controls said outlet.
摘要:
The invention relates to a method for feeding pasty masses using a pump device which has a piston pump with at least two cylinders, each having one piston, wherein each cylinder of the pump device is connected to a pre-fill container via an inlet opening, which can be closed by an inlet slide valve associated with the cylinder, and wherein each cylinder of the pump device is connected to a feed line via an outlet opening, which can be closed by an outlet slide valve associated with the cylinder, wherein pasty mass is fed from the pre-fill container into the respective cylinder during a suction stroke of a cylinder with the inlet opening open and the outlet opening closed, and wherein pasty mass is fed into the feed line during a pump stroke of a cylinder with the outlet opening open and the inlet opening closed, wherein the piston velocity is greater during the suction stroke than during the pump stroke, and wherein at the end, toward the end or shortly after the end of the suction stroke, the inlet opening is closed by the inlet slide valve, whereafter the pasty mass is compressed in the cylinder before the outlet opening is opened.
摘要:
A switching arrangement for controlling the speed of hydraulic drives, wherein a speed of the drive is assigned to a corresponding flow rate of a hydraulic medium. The flow rate is determined by a preselected pair of phased nozzles placed in the inlet and outlet lines. The nozzle flow rates are selected such that switching between a series of nozzle pairs creates a smoothly changing speed of the hydraulic drive, thus eliminating jolting during starting and braking.
摘要:
The invention relates to a two-cylinder thick matter pump having a piston storage which is filled during the thick matter feed with the feed cylinders and evacuated by the hydrocontrolled storage piston into the feed pipe between the strokes of the feed pistons to reduce the pressure drop and the undelivered amount in the feed pipe. The inventive proposal is that the hydrocontrol of the storage piston (10) is served by a working piston (8) to be acted upon hydraulically on both sides, that is controlled with the feed cylinders and whose limits of travel, with the limits of travel of the storage piston (10), are fixed on the storage driving cylinder (7) when the storage cylinder (4) is fully evacuated and is filled.
摘要:
In a two-cylinder viscous liquid pump with a pipe switch, which by means of a swing pipe alternately connects one of the pump cylinders with the conveyor pipe and releases the other pump cylinder, and which swing pipe is moved along its path of travel by a sliding pin drive via a rocking shaft at varying speeds, powered by one or more hydraulic cylinders, the invention provides a link in the transmission of motion from the drive output to the sliding pin drive, which link serves to change the distance of the connecting element of the sliding pin drive to the axis of the rocking shaft, going from a maximum distance at the beginning and end of the link travel to a minimum distance at the center of the link travel.
摘要:
A twin cylinder pump for viscous materials such as concrete, having a guide for a cutting ring producing a sealing effect on the cylinder and a seat for supporting a loaded spring ring of elastic material of rubber or the like, is so designed that the ring is acted upon by the pressure of the feed taking effect in the ring-like gap, open as far as supporting face or seat of the spring, between the cutting ring and the valve member. Furthermore there is a guiding and constraining means for the ring taking effect thereon between the radial faces against which it is rested.
摘要:
The valve has a shutter mechanism which is movable within a housing and is provided at one end with at least one inlet which is movable across one or more housing openings and at the opposite end with an outlet surrounded by a sealed contact joint which is movable across a delivery pipe opening in the housing. This sealed contact joint surrounds the delivery pipe opening in the housing and contacts either the inside wall of the housing or a face plate arranged on the inside wall of the housing in all intermediate and final positions of the shutter mechanism. With the aim of reducing wear and producing a permanent seal, the sealed contact joint is in the form of a compressible sealing ring with a slotted or kidney-shaped cross-section which serves to wipe the flat and smooth face plate or inside wall of the housing. Moreover the compressible sealing ring is loaded with the internal pressure of the shutter mechanism and is supported outwardly by a flange surrounding the outlet and extending in the conveying direction.