A large manipulator includes an articulated boom that can be folded out. The articulated boom includes boom segments including a last boom segment having a boom tip. The articulated boom includes an end hose and end-hose holder. The end hose is flexible, arranged on the last boom segment, and can be removably coupled to the last boom segment by the end-hose holder. The end-hose holder includes a holding bracket arranged on the last boom segment. The holding bracket is configured to be pivotable into a first pivot position, a second pivot position, and a third pivot position relative to the last boom segment.

A wheeled hose moving device that is movable over a support surface and that is operable to lift and move a concrete supply hose at the support surface. The device includes a wheeled support including a hose lifting device and a hose support element. The hose lifting device is vertically movable between a raised position and a lowered position and is adjustable between a lifting state and a non-lifting state. The hose support element is adjustable between a support state and a non-support state. The hose lifting device is, when lowered to be at the hose, adjusted to engage and lift the hose. As the hose lifting device lifts the hose upward, the hose support element is automatically adjusted from the non-support state to the support state to support the lifted hose.

The invention relates to an end hose holder (20) for distributor booms (2) of concrete pumps (1), to a concrete pump (1) with corresponding end hose holder (20) and to a method for assembly thereof. The end hose holder (20) is used for the selective provision of an attachment point for an end hose (6) and comprises a foot shell coupling (21), which is fastened by way of its foot (23) to a support element (24), for the rotary pipe connection of two concrete line segments (11, 14), the support element (24) having a flange (26) which is configured for the coupling connection to a concrete line segment (11, 14), the relative position of which flange in relation to the foot shell coupling (21) corresponds to a predetermined concrete line segment (11, 14).

An electrohydraulic control circuit includes a hydraulically-operated drive assembly and an emergency valve. The hydraulically-operated drive assembly includes an electrically-actuated proportional valve and hydraulic operating lines. The proportional valve is connected to the hydraulic operating lines for actuation of the drive assembly in a normal operation mode. The proportional valve is also connected to a pressure supply line and to a return line. The emergency valve is connected to the hydraulic operating lines for actuation of the drive assembly in an emergency operation mode. In the emergency operation mode, the emergency valve is actuated via an emergency operating unit.

A method and system for the hydraulic control of a concrete placing boom (14) comprising a plurality of boom arms (16), wherein hydraulic drive cylinders (18) for the boom arms (16), which are connected to one another in an articulated manner, are controlled by a hydraulic circuit (34), wherein a supply pressure is supplied via a hydraulic pump (32) to the hydraulic circuit (34), and wherein a pressure signal is captured in the drive cylinders (18) by at least one pressure sensor (38) for each cylinder. The maximum pressure in the drive cylinders (18) is determined from the pressure signals and the supply pressure is adjusted by an electronic control unit (36) according to the maximum pressure.

A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic cylinder (110), first and second counter-balance valves (300, 400), and first and second control valves (700, 800). A net load (90) is supported by a first chamber (116, 118) of the hydraulic cylinder, and a second chamber (118, 116) of the hydraulic cylinder may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first control valve may apply a holding pressure and thereby hold the first counter-balance valve closed and the second counter-balance valve open.

The invention relates to a mobile concrete pump (10) having a chassis (12) which has extendable supporting legs (14), and a concrete distributor mast (18), which is arranged on a slewing mechanism (16) of the chassis (12) such that the concrete distributor mast can be slewed and the inclination thereof can be adjusted by means of an actuating cylinder (22), and which comprises multiple pivotable mast arms (20), and a computing unit for carrying out a stabilization calculation by using the vertical and/or horizontal forces on at least two supporting legs (14), and having a control device which is configured, depending on stability check, to delimit a slewing movement on the slewing mechanism (16) and/or a pivoting movement of at least one mast arm (20.1, 20.2 20.3) and/or the initiation of a pumping operation.

A device monitors for bearing capacity failure of a mobile work machine. The work machine has a number of stabilisers. Each stabiliser has a support foot having a support foot plate. When the mobile work machine is in a supported state, the support foot plate of at least one support foot is arranged on a base surface surrounding the work machine or on a base plate. The device for bearing capacity failure monitoring has a number of sensors for sensing a change in position of at least one support foot plate and/or at least one base plate. The device has an evaluation unit, which has a data connection to the number of sensors and is designed to detect a bearing capacity failure on the basis of a change in position of the at least one support foot plate and/or the at least one base plate that has been sensed by means of the number of sensors.

An operation vehicle, comprising a vehicle body and a cab provided at a front end of the vehicle body, and further comprising a boom device. The boom device comprises at least seven booms hinged end to end in sequence. When the boom device is in a folded state, a fifth boom and a sixth boom are located on the same straight line, a seventh boom is located below the sixth boom, and end portions of at least two booms in the seven booms are located above the cab. The technical solutions of the present application overcome the defect in the prior art that the flexibility of boom construction of the operation vehicle is low.

A large manipulator includes a chassis, a turntable arranged on the chassis and rotatable around a vertical axis via a rotary drive, and an articulated mast including two or more mast segments pivotably-movably connected, via articulated joints, with the respectively adjacent turntable or mast segment via a respective drive. The large manipulator further includes a mast sensor system configured to detect position of at least one point of the articulated mast or a pivot angle of at least one articulated joint and configured to generate sensor output signals. The large manipulator further includes a control device configured to actuate the drive in a normal operation for mast movement and to limit speed of movement of the articulated mast depending upon the sensor output signals. The drive is manually controllable in an emergency operation. The large manipulator further includes at least one limiting means, which, in the emergency operation, limit speed of the drive to a pre-specified maximum value.