Abstract: Disclosed is a control system for a hydraulic work machine, comprising a plurality of hydraulic work circuits for supplying actuators and/or drive units of movable machine parts with hydraulic fluid, and an emergency stop circuit for the work circuits for avoiding danger caused by the machine parts. According to this disclosure, the emergency stop circuit comprises a single safety valve which is connected in parallel to the work circuits via at least one branch line each at the inlet and to a pressure relief point at the outlet.

Abstract: Disclosed is a vehicle-mounted concrete pump comprising a vehicle and a concrete distributor boom which can be transported thereon and which is mounted on a boom pedestal in such a way as to be able to rotate about a vertical axis and in such a way as to be able to pivot about a horizontal axis, wherein the boom pedestal is held on profile supports of an installation frame on the vehicle via connecting means. According to the disclosure, it is proposed that a screw attachment bar is arranged as connecting means between the boom pedestal and each profile support, wherein the screw attachment bar has, distributed over its length, a plurality of assembly recesses and screw channels opening into the latter for screw connections to the profile support.

Abstract: A concrete distributor mast has a plurality of mast arms, which can be moved relative to each other. The mast arms are connected to each other in a hinged manner at coupling points and have in the region of the coupling points hinge points, at which drive and coupling members of a coupling gear mechanism that actuates the mast arm movement are coupled in a hinged manner. Situated at the hinge points of the mast arms are hinge components, which span the respective mast arm transversely and define a bearing axis. At least one of the hinge components has a hinge pin, which is connected in a rotationally fixed manner to the mast arm, projects outwards beyond the mast arm to both sides at the free ends thereof, and is connected in a rotationally fixed manner to the mast arm. On the ends of the hinge pin that project beyond the mast arm, bearing shells are arranged for the rotary bearing of an adjacent drive or coupling member of the coupling gear mechanism.

Abstract: A supporting leg for a working machine that has a mast includes a hollow body, which is composed of two web plates arranged at a distance from each other and two flange plates, which connect the web plates to each other and are arranged at a distance from each other and are connected to the web plates by welds, and a supporting foot protruding downward from the hollow body. The web plates each have two substantially vertically arranged broad sides and two substantially horizontally arranged narrow sides that connect the broad sides to each other. The flange plates each have two substantially horizontally arranged broad sides and two substantially vertically arranged narrow sides that connect the broad sides to each other. The flange plates each lie against broad sides of the web plates facing each other via the narrow sides of the flange plates and the narrow sides of the web plates are exposed and form lower and upper contact surfaces of the hollow body.

Abstract: This disclosure relates to a truck-mounted concrete pump comprising a concrete-distributing boom which is constituted by a plurality of folding boom arms and rotationally mounted on a slewing gear on a chassis, and a tilt sensor for detecting a tilt of the truck-mounted concrete pump. According to this disclosure, the truck-mounted concrete pump is provided with a safety device which restricts the operating range of the concrete-distributing boom subject to a tilt of the pump, said safety device being coupled to the tilt sensor. The safety device is designed to limit the slewing motion on the slewing gear and/or the swiveling motion of at least one boom arm.

Abstract: A boom for a working machine, in particular a concrete-distributing boom for guiding a concrete delivery line, with a plurality of boom arms which can be moved into a working position and which are composed at least partially as a box construction of a plurality of side walls delimiting a cavity region, and with a sealing bulkhead arrangement for sealing a cross section of the cavity region, wherein the sealing bulkhead arrangement has a bulkhead wall provided peripherally with an at least partially encircling sealing groove, and wherein the sealing groove has arranged therein an elastic seal which bears tightly on the inside against the adjoining side walls.

Abstract: This disclosure relates to a work machine with a chassis, with a mast block which is mounted on the chassis and has a rotary head which can be rotated about a vertical axis of rotation, and with a mast which has at least two mast arms, wherein each of the mast arms, with the exception of a last mast arm which has a free end, is pivotably connected, starting from a first mast arm, to the respectively following mast arm by means of an articulation, and wherein the first mast arm is mounted on the rotary head so as to be pivotable about a horizontal pivot axis. According to this disclosure, at least one chassis-mounted supporting device is provided which has a supporting surface on which a component of the articulation or a component of one of the articulations is supported.

Abstract: A container for accommodating high-viscosity materials, such as liquid concrete. The container has at least one bearing sleeve, which extends through a wall opening and is fastened in the container wall in a liquid-tight manner. A shaft extends through the bearing sleeve in such a way that an annular gap is left open. A shaft seal, which bridges the annular gap and is made of elastomeric material, is located at the container-interior end of the bearing sleeve. A lubricant is applied to the annular gap from the container exterior. The invention is characterized in that the shaft seal has, on the side thereof radially facing the shaft, a conveying thread that supports the conveying of the lubricant in the direction of the container interior, which conveying thread advantageously communicates with the container interior via a check valve open to the container interior.

Abstract: An inventive boom arm for a concrete-distributing boom. The boom arm has an elongate box-profile support formed from two flanges and two webs connecting the flanges laterally. The boom arm has first and second articulation points spaced apart in the longitudinal direction of the boom arm. A first flange opening is disposed at the first articulation point and a second flange opening is disposed at the second articulation point. A sealing-partition seals a cavity region of the box-profile support at least in a region of the first and second flange openings. The sealing partition can be provided in the form of a plate that continuously spans the cavity region between the first and second articulation points and is connected laterally to the webs. The first articulation point is located at the end of the boom arm and is arranged within the cavity region and is covered by the partition plate.

Abstract: This disclosure relates to a truck-mounted concrete pump including a vehicle, a concrete distributor boom disposed on the vehicle and including multiple boom arms that can be stowed, in the form of an arm assembly, on a vehicle-mounted boom resting unit, and a boom hydraulic system configured to stow and unfold the arm assembly and including a hydraulic cylinder that moves the arm assembly against the boom resting unit in a stowing movement. To terminate the boom stowing movement, a protective circuit is coupled to the hydraulic cylinder. The protective circuit includes a switching unit actuable under the load of the arm assembly. The switching unit has a load receiving element arranged on the boom resting unit that is resiliently deformable when stowing the arm assembly, wherein the arm assembly is only supported on the boom resting unit by the load receiving element.

Abstract: This disclosure relates to a distribution boom for stationary or mobile viscous material pumps, comprising at least one boom arm having a box profile. The boom arm has two side walls which are arranged at a distance from one another and which are connected to one another by means of two transverse walls which are arranged at a distance from one another. Each side wall has a lead-through opening for a conveying line. Provision is made according to this disclosure for there to extend between the side walls a tube which is fixedly connected thereto and which opens by way of the tube ends thereof into the lead-through openings. Between the tube ends and the adjacent side wall there is arranged a respective flange which projects in an encircling manner over an outer border of the respective tube end and is welded both to the tube end and to the side wall in question.

Abstract: A mast arm for a concrete distributor mast comprises an elongated box profile support composed, in at least some sections, of a lower belt, an upper belt, and two lateral walls that connect the belts, and comprising at least one partition sheet metal element arranged in a hollow cross-section of the box profile support, the partition sheet metal element being welded to the box profile support along longitudinal welding joints running along the box profile support.

Abstract: This disclosure relates to an automatic concrete pump comprising a support structure, which is mounted on a vehicle, for a concrete distributing mast and at least two supporting jacks which are pivotably joined to the support structure via an articulated joint, each articulated joint comprising two support plates made from a solid material, each having a bearing bore and protruding in a forked manner at a lateral distance from each other over the edge of a defining wall of the support structure, and having a hinge bolt which traverses the bearing bores. According to this disclosure, the defining wall which faces the hinge bolt is further away from the axis of the hinge bolt in the central area between the bearing plates than in the edge areas thereof which are adjacent to the support plates.

Abstract: The invention relates to a hydraulic system, preferably for piloting and actuating a two-cylinder thick matter pump. The hydraulic system comprises a tank (68) for receiving hydraulic oil, a primary circuit having at least one hydraulic consumer (AH, MH) which has at least one primary pump (36, 38, 61, 70), which is loaded with hydraulic oil via a first suction line (42), and is connected on the outlet side to at least one first return line, and which has a suction/return filter (40) which communicates with the first suction line (42) on the outlet side and is loaded on the inlet side with return oil from the at least one return line. A special feature of the invention consists in that the first suction line (42) communicates with the tank (68) via a separate replenishing suction line (86) and a suction filter (66), wherein a replenishing suction valve (88) which is preloaded in the direction of the suction filter (66) is arranged in the replenishing suction line (86).

Abstract: A work device has a stationary or movable frame which has a substructure fixed to the frame, a rotating head rotatable about a vertical rotational axis on a bearing block of the substructure by a drive mechanism, and an extension arm mounted on a bearing point of the rotating head in a pivotal manner about a horizontal pivot axis. A hydraulic cylinder piston unit has ends fixed to the cylinder and to the piston rod and hinged to hinge points on the extension-arm side and on the rotating-head side with a horizontal hinge axis. The rotating head has a base section arranged on the bearing block and an adapter piece including the bearing point for the extension arm and the hinge point on the rotating-head side for the cylinder piston unit. The base section and the adapter piece can be removably coupled to each other via a separating point.

Abstract: A concrete dispensing boom for stationary and mobile concrete pumps has a plurality of boom arms, connected to one another at joints, and a concrete conveying line consisting of a plurality of pipe segments preferably connected to one another in an articulated manner via pipe bends and rotary couplings. Said pipe segments run along the individual boom arms and are attached to these boom arms. At least one of the boom arms has a hollow chamber profile which has at least two hollow chambers separated from one another by a separating wall, at least one of which chambers is a closed chamber and one is open at the periphery. The pipe segment allocated to the boom arm concerned is disposed on the opening side outside, partially inside or inside the open hollow chamber.

Abstract: A supporting leg for a working machine that has a mast includes a hollow body, which is composed of two web plates arranged at a distance from each other and two flange plates, which connect the web plates to each other and are arranged at a distance from each other and are connected to the web plates by welds, and a supporting foot protruding downward from the hollow body. The web plates each have two substantially vertically arranged broad sides and two substantially horizontally arranged narrow sides that connect the broad sides to each other. The flange plates each have two substantially horizontally arranged broad sides and two substantially vertically arranged narrow sides that connect the broad sides to each other. The flange plates each lie against broad sides of the web plates facing each other via the narrow sides of the flange plates and the narrow sides of the web plates are exposed and form lower and upper contact surfaces of the hollow body.

Abstract: A working device has a substructure for receiving a supporting device for ground support and an elongated working boom. The one end of the working boom is mounted on a rotary head bearing block, which projects beyond the substructure, in a pivotal manner about a horizontal axis. Furthermore, the rotary head is mounted on a rotary bearing of the substructure in a rotatable manner about a vertical axis by a radially projecting bearing ring. The bearing block and the bearing ring of the rotary head are rigidly connected to each other via a base plate provided with a central opening. The rotary head has an annular reinforcing structure which points away from the mounting plate in the direction of the substructure and is concentric about the bearing ring, the reinforcing structure compensating for the non-roundness of the support structure of the bearing block in the circumferential direction of the bearing ring.

Abstract: The invention relates to a hydraulic drive system for a belt conveyor with a motor-driven primary pump which is arranged in a hydraulic primary circuit and is intended for conveying hydraulic fluid, a hydraulic motor which is supplied with hydraulic fluid via the primary circuit and is intended for driving the belt conveyor, and a control device which influences the flow of hydraulic fluid in the primary circuit and is intended for controlling the belt speed of the belt conveyor. In exemplary embodiments, the primary pump is a variable displacement pump and has a pump regulator for regulating the conveyed flow of hydraulic fluid, and the control device comprises a hydraulic control circuit, which is operated by means of an auxiliary pump, for subjecting the pump regulator to an adjustable actuating pressure.

Abstract: A mobile concrete pump with a support structure, which can be placed on a vehicle frame of a truck chassis, for receiving functional units which form a support device and a distributing boom. The functional unit which forms the distributing boom has a rotary head mounted on a boom pedestal in a rotatable manner about a vertical axis, the boom pedestal being secured to the support structure, and the boom pedestal comprises a tank which engages into the support structure and is provided as a rotary bearing for the rotary head. Each functional unit which forms the support device has a support leg mounted in a bearing in a pivotal and/or telescopable manner, the bearing being secured to the support structure. A tank wall of the tank tapering from the top to the bottom in a truncated cone-like manner or in a truncated pyramid-like manner in the cross section, engages into the support structure and is rigidly secured, preferably welded, into the support structure.