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: 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).

Abstract: In a mobile mixer, preferably having counterrotational emptying, for building materials, in particular concrete, in a mixing drum (1) which, on its inner wall (9), has one or more flat elevators (11, 12) following a helix and extending from the closed drum base (2) to the drum opening (3), which elevators (11, 12) are driven about the drum axis during rotation of the mixing drum and push the building material to the front of the closed base (2) during transport and during mixing, with one or more flat sections (26, 27) which are helically curved about the mixing drum axis (4) being fixed for driving during the mixing drum rotation (5) in the mixing drum space enclosed by the elevators acting as mixing spirals (11, 12), which flat sections (26, 27) are arranged counterrotationally to the mixing spirals (11, 12) in such a way that, during the transport and during the mixing of the buiding material (13), they produce a counterflow in the building material filling core surrounded by the mixing spirals (11, 12).

Abstract: In a method and an apparatus for pneumatically discharging hydromechanically conveyed hydraulic building material for underground operations, in which compressed air is supplied to the wet building material, pumped in a dense stream, in front of a mouth piece serving the discharge thereof and having in particular a nozzle shape, the compressed air being gunned out together with the building material, the invention provides for the dense stream of the pumped building material to be supplied to the compressed air supplied in a stream, sealed off from the outside air by the wet building material, and thereby be distributed in the compressed air stream and conveyed with the latter to the mouth piece to be discharged therefrom.

Abstract: 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.

Abstract: An improved bucket connection apparatus is provided in a bucket excavator whose working implement is connected to the bucket arm with an operating hinge and whose drive consists of a pair of working cylinders attached on either side of the operating hinge axis. The operating hinge is attached to a clamp that has two clamping feet, with at least one foot being movable about a clamping hinge axis which coincides with the operating hinge axis. The movable clamping foot is connected on the outside with one of the two working cylinders, and, on the insides, it is constructed as a gripper opposing the other clamping foot, for engaging connections (such as upstanding bolts) provided on the associated working implement for the purpose of attaching the operating hinge. The connections cooperate with the clamping feet to provide a locking arrangement that is effective when the clamping feet are in their gripping position.

Abstract: For the remote control of construction machinery, more specially in the form of the distribution mast or boom of a concrete pump, in the invention a transmission system has a radio remote control unit whose control transmitter and receiver are joined up with the command unit and with the distributor for the solenoid valves respectively by respective plug contact connector means. The transmission mode is one using digitally encoded RF messages so that for each control function two part-messages are continuously transmitted after the connections have been made, such messages each being made up of a bit representative of the function, of address information and of a parity bit for security, and mirroring the condition of the circuits of the command unit. The receiver has a RF receiving part, a central process controller and a relay part or a D/A converter.

Abstract: A two-cylinder pump for heavy flowable materials, such as concrete, comprising a shutter mechanism which is pivotable across an apertured face plate, the shutter mechanism being sealed against the face plate by means of a cutting ring which is axially movable relatively to the shutter mechanism and is supported thereon with its rear side engaging a rectangular-section flexible rubber ring, whereby the cutting ring is urged resiliently against the face plate, means for locating the cutting ring, along a portion of its length, on the shutter mechanism, a seating for the flexible ring on the cutting ring which includes an annular extension which partly overlaps the longer cross-sectional side of the flexible ring in the axial direction, a seating for the flexible ring on the shutter mechanism which includes an annular extension which partly overlaps the longer cross-sectional side of the flexible ring in the axial direction, said annular extensions partly overlapping the ring from opposite sides thereof so that