Abstract: In a distribution device intended in particular for concrete distribution, a scissor-like assembly of conveying-conduit elements is provided to ensure lengthwise adjustment of the concrete-conveying conduit to a telescopic distribution-boom section which supports the concrete-conveying conduit. The scissor assembly is designed such that the articulation points of the conveying-conduit elements move past each other while the telescope is being extended or retracted from one end position to the other, and alternately assume transposed positions when the telescope is fully retracted or fully extended. The conveying-conduit elements will always assume an extended position, either against the direction of concrete conveyance or in the direction of concrete conveyance, when the telescope is either fully retracted or fully extended.

Abstract: A two-cylinder thick-matter pump for continuous delivery of thick matter is characterized in that a reversing valve (5) has a diverter housing (8, 8′) with at least four openings (a-b), the diverter (6, 6′) disposed in the diverter housing (8, 8′) is swiveled with its outlet opening in front of the cylinder openings and has an inlet opening (RE) which is firmly connected with the suction pipe (3), the cavity (H) in the diverter housing (8, 8′) being constantly under delivery pressure, and at least one shut-off element (10) being provided for closing the suction pipe (3) and/or the first and/or second openings (a , b) of the diverter housing (8, 8′).

Abstract: A two-cylinder slurry pump (1) includes: a filling tank (2) for receiving thick matter; an agitator whose shaft (11) is placed in the filling tank (2), and a pivoting sleeve valve (16) fitted in the filling tank (2) which regulates the alternating intake and delivery strokes of the delivery cylinder. This pump also has an entry branch and an exit branch (15) pivotingly connected with the delivery piping (19). In accordance with the invention, the entry openings (46, 45) of the delivery cylinders (34, 35) are positioned behind the back wall (5) of the filling tank, and the exit branch (15) is positioned between the agitator shaft (11) and the back wall (5).

Abstract: In a vehicle (1) having a swiveling mast (12) which is built on a slewing gear (11) disposed on a frame and has associated therewith a frame support (18) including arcuate guides fixed on the vehicle for beams (19 to 22) to be drawn into the vehicle profile, the guides (31 to 34) and the beams being disposed in a horizontal plane and the guides (31 to 34) extending substantially between the longitudinal sides (35, 36) of the vehicle profile, the invention provides for the guides (31 to 34) to be disposed tangentially to the longitudinal direction of the vehicle, each extending inwardly from one of the longitudinal sides (35, 36) of the vehicle profile substantially to the center (5) of the vehicle and from there further to the same longitudinal side (35, 36) of the vehicle profile (FIG. 1).

Abstract: In a concrete pump for wet spraying, in which standard concrete is pumped to a mixing jet, compressed air and if necessary a hardening accelerant are mixed into the concrete stream, which is applied with the jet and compressed; it is the purpose of the invention in its initial version on the one hand to minimize the fine dust yield at the jet, on the other hand to guarantee the availability of the amount of compressed air needed for the wet spraying process, characterized by a regulating section (20) in which the capacity of the concrete pump (1) forms a standard volume for monitoring the amount of compressed air flowing to the mixing jet (3) in such a way that the relationship of the amount of compressed air mixed in per unit of time to the amount of concrete pumped in per unit of time corresponds to a desired value which produces the smallest fine dust yield when the concrete is applied.

Abstract: The invention covers a device for the pneumatic delivery of concrete that is hydromechanically transported in an enclosed stream (2) with a concrete pump (1) for the hydromechanical transport, and a solidification accelerator dosing device.

Abstract: The present invention is a sludge pump system which includes a means for monitoring operation of a sludge pump. The sludge pump includes a material cylinder and a piston moveable in the material cylinder. A pump drive moves the piston during working cycles which include a pumping stroke and a filling stroke. A pump valve mechanism connects the material cylinder to an outlet during pumping strokes and connects the material cylinder to an inlet during filling strokes. A means for monitoring operation of the pump is provided. The means for monitoring includes a means for sensing a first parameter related to operation of the pump drive, a means for sensing a second parameter indicative of operation of the piston, and a means for determining errors in the operation of the pump based upon the first parameter and the second parameter.

Abstract: The present invention is a sludge pump system which includes a means for monitoring operation of a sludge pump. The sludge pump includes a material cylinder and a piston moveable in the material cylinder. A pump drive moves the piston during working cycles which include a pumping stroke and a filling stroke. A pump valve mechanism connects the material cylinder to an outlet during pumping strokes and connects the material cylinder to an inlet during filling strokes. A means for monitoring operation of the pump is provided. The means for monitoring includes a means for sensing a first parameter related to operation of the pump drive, a means for sensing a second parameter indicative of operation of the piston, and a means for determining errors in the operation of the pump based upon the first parameter and the second parameter.

Abstract: In a pump for thick matter with delivery cylinders (1, 2), in particular a two-cylinder concrete pump, which in order to control the flow of thick matter, incorporates a distributing regulator (11) that is connected permanently at an outlet opening (8) with the pump-side end (9) of a delivery line (7) and which incorporates at least one inlet opening (12) where it is sealed on the web (29) between the thick-matter flow passage openings (16, 17) from the delivery cylinders into a supply tank (6), the thick-matter flow passage openings (16, 17) and the inlet opening (12) of the distributing regulator (11) being of identical outline and area, the distributing regulator (11) connecting adjacent thick matter flow passage openings (16, 17) alternately with the delivery line (7) and the supply tank (6) by a rotating movement, the present invention provides for the fact that the thick-matter flow passage openings (16, 17) together with their associated delivery cylinder openings (22, 23) are each connected through a

Abstract: In a hydraulic slide valve control for working cylinders with unequal piston speeds, in which the volume stream of the hydraulic working medium that loads the piston is adjusted to the prevailing piston speed and the direction of motion of the piston is set with a pilot-operated distribution valve, it is provided according to the invention that the redirecting valve (S3) is hydraulically pilot-operated with a pilot valve (A), which is adjustable by the control impulses for the working cylinder (1) and that between the pilot control paths (11, 12) from the pilot valve (A) to the redirecting valve (S3) a hydraulically pilot-operated control valve (B) is installed, through which runs one of the two volume streams of the hydraulic working medium, where a piston speed is assigned to each position of the control valve (B).

Abstract: 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.

Abstract: A slurry pump for mixing concrete includes a charge funnel, a pair of discharge cylinders, and a discharge line operable with each other to form a slurry flow control. A control valve has an exit port connected with the discharge line and an entrance port that is alternatively positioned in front of an opening of each discharge cylinder. A pair of gate valve disks are positioned one on each side of the entrance port. The size of each gate valve disk conforms to a surface between the discharge cylinder openings such that in a change-over midpoint of the control valve the openings of the discharge cylinders are sealed off by the gate valve disks, and the entrance port and the control valve is sealed off on the surface between the discharge cylinders for the execution of a partial stroke a discharge cylinder piston which compresses the drawn in slurry. A compensation cylinder prevents slurry interruptions during the change-over the control valve.

Abstract: In a thick materials pump with paired, preferably parallel, feed cylinders, which alternatingly deliver and intake, and with a slide, which pivots on the axis of a central channel and, for each pair of feed cylinders, connects, by way of a branch channel, the given feed cylinder with a fixed feed conduit connecting to the central channel, while, simultaneously and by means of a sealing control surface provided on the inner wall of the slide housing for each branch channel receiving the thick material and provided with an aperture for each branch channel, closing a second branch channel of the slide and freeing the intake feed cylinder, while identical pressures are developed in the branch channels of equal length, the invention is characterized by the facts that the branch channels (7, 8) are essentially aligned and, in each case, form a right angle with the central channel (9), and that the sealing control surfaces (18, 20) on the slide housing (21) are cylindrically arched.

Abstract: 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.

Abstract: An apparatus for pneumatically discharging a liquified building material includes a first source of liquid hardener and injection means for injecting the liquid hardener perpendicularly into the air-entrained building material at the discharge nozzle. The liquid hardener may be supplied through an atomizer and injected through openings that are enlarged. A second source of liquid hardener may be provided to supply a second hardener mixed with the airstream that entrains the building material. A flexible tubing may be provided between the aeration fitting and discharge nozzle to require that only the discharge nozzle be lifted by the operator.

Abstract: In an apparatus for pneumatically discharging concrete fed hydromechanically in a dense stream, using for the hydromechanical feed a concrete pump having a hydraulic drive comprising at least two cylinders with opposed pistons, said pump having synchronization control by a displacer circuit conducting the working medium displaced by a piston, and having a dosing means for an additive serving as an accelerating agent, whose drive is connected to the hydraulic circuit of the concrete pump drive, the inventive proposal is that the drive of the dosing means is connected to the displacer circuit and designed as a reciprocating piston drive whose absorption amount corresponds to the displacement amount of the working pistons and is added in both directions to the displacement amount of each working piston.

Abstract: An apparatus for pneumatically discharging a liquified building material includes a first source of liquid hardener and injection means for injecting the liquid hardener perpendicularly into the air-entrained building material at the discharge nozzle. The liquid hardener may be supplied through an atomizer and injected through openings that are enlarged. A second source of liquid hardener may be provided to supply a second hardener mixed with the airstream that entrains the building material. A flexible tubing may be provided between the aeration fitting and discharge nozzle to require that only the discharge nozzle be lifted by the operator.

Abstract: A double-belt conveyor band with a continuously revolving conveyor band, the belt of which is supported on a band feeder and in connection with a steep segment on trough roller assemblies, and is supported flatly on the steep segment, as well as with a continuously revolving covering band. The belt is buckled in the conveyor seam for the formation of closed conveyor spaces, preferably between traction reinforcements positioned externally, the shear-resistant lateral reinforcements acting in cooperation therewith. The belt ends are pressed on one another and the longitudinal edges of the belt are held together. It is provided in accordance with the invention that, in order to hold together the belts on both longitudinal edges of the cover band, fasteners projecting externally are provided with opposing apertures to which the longitudinal edges of the conveyor belt, during the running of the trough roller assemblies, approach or move away from during the running of the conveyor belt.

Abstract: 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

Abstract: An adjustable personnel platform (38) is rotatably fastened on a lift tower end, with a carrying arm (42) and a pivot link (43) in the pivot plane of the elements (15, 21, 26) of the lift tower. It is automatically held horizontal through a reversable electric motor (96) and a speed translating drive (66, 67) as well as through a control surrounding a regulator with an inclination measuring device (92). The speed translating gear drive (66, 67) directly drives the rotatable part (64) of the pivot link (43). Between carrying arm (42) and the motor a plurality of direction changing couplings (81, 86) are provided. They arrest the rotation of the carrying arm (42) in both directions of rotation and release the rotary direction of the carrying arm (42) in a respective one of the rotary directions of the motor (97).