Abstract: A large manipulator with an articulated mast (22) is pivotally connected to a mast base (21) that is rotatable about a vertical axis. The mast (22) comprises at least three mast arms (23 to 27) which are pivotable to a limited extent about horizontal articulated axis (28 to 32) that are located parallel to each other, the pivoting movement being relative to the mast base (21) or an adjacent mast arm (23 to 27) and being performed by means of a respective drive unit (34 to 38). A control unit is provided with coordinate transformer (74, 76) which responds to a given guiding parameter (r) and measured angular values (??) that are determined by means of angle sensors (44 to 48) located on the mast arms (23 to 27). The coordinate transformer (74, 76) does a conversion into movement signals (??v) for the drive units (34 to 38) in accordance with predefined path/slew characteristics, the movement signals being related to the articulation axis.

Abstract: The invention relates to a device for monitoring the safety of a bending pole (22) in a large manipulator, whereby the arms (23-27) of the mast can be pivoted in relation to each other by means of a drive unit (34-38). The relative position of the arms of the mast in relation to the respective adjacent arm of the mast or frame of the mast (21) is measured for adjusting the position thereof. According to the invention, the positing measuring values (?I) of the arms of the mast are used in order to control the safety of the drive units (34-38) or the actuators thereof (80-84) in relation to a variation of predefined safety values.

Abstract: A thick matter pump comprising a drive motor (50), a (reversible) hydraulic pump (6), and two hydraulic cylinders (5, 5?) coupled to conveyor cylinders (7, 7?) for conveying the thick matter. A regulator regulates the rotational speed N of the drive motor (50), and a regulating clement (18, 20) regulates the displacement volume V of the hydraulic pump (6). A control module (54) regulates the rotational speed N of the motor and the displacement volume V. For improved operational ease and reduction of fuel requirements, noise and waste gas emission, the control module (54) comprises a final control element (56) for regulating the conveyance capacity of the conveyor cylinders (7, 7?), and an electronic control unit (108) which reacts to the position of the final control element (56) and allocates a nominal value to the rotational speed regulator and to the displacement volume regulator (20), in a software-assisted manner.

Abstract: The invention relates to a hydraulic circuit arrangement, in particular for the drive of concrete distributor masts. The circuit arrangement comprises at least one hydraulic load (34, 35, . . . ), the latter being connected at the inlet side by means of a feed line (64) to the pressure outlet of a hydraulic positive displacement pump (60), and comprises at least one proportional valve (56) which is arranged in the feed line (64), is assigned one of the loads and, in its rest position, blocks the feed line (64), and in an operating position, forms a throttle aperture (57) with a variable opening cross section. Also provided in the feed line (64) is a reversing group (82), which in the standby state is connected to the tank (62) and in the operating position is connected to the at least one load (34, 35, . . . ).

Abstract: A method for controlling a thick matter pump comprising two delivery cylinders (10) emerging, via two openings (12), into a material reservoir (14), associated with two delivery pistons (26), symmetrically synchronized relative to said cylinders, and a branch pipe 18 arranged inside the material reservoir (14), capable of being connected, on the input side, alternatively to one of the openings of the delivery cylinders with exposing of the other opening, the output side connected to a conveyance conduit (20). When the pumping is interrupted, thick matter, liquid concrete for example, is sucked up, via the delivery cylinder temporarily communicating with the reservoir, and is delivered, via the other cylinder (10), connected to the branch pipe (18), so as to form a column of thick matter through the delivery pipe (20), towards its output.

Abstract: A thick matter pump comprising a conveyance capacity control system. Said thick matter pump comprises a drive motor 50 which is preferably embodied as an internal combustion engine, a hydraulic pump 6 which is preferably embodied as a reversible pump, which has a variable displacement volume V and can be coupled to the driving motor, and two hydraulic cylinders 5, 5? which are connected to the hydraulic pump 6, can be controlled by the same in a push-pull manner, and are each coupled to a conveyor cylinder 7, 7? for conveying the thick matter. A regulator for regulating the rotational speed N is associated with the drive motor 50, and a regulating element 18, 20 for regulating the displacement volume V is associated with the hydraulic pump 6. A control module 54 is also provided for regulating the rotational speed N of the motor and the displacement volume V.

Abstract: The invention relates to a device for monitoring the safety of an articulated mast (22), especially of a concrete distribution mast, whose mast segments (23 to 27) are controlled via a remote control (50) and a control device (62) that is responsive to the remote control signals using a computer-assisted circuit arrangement (80). Safety monitoring is made possible by the provision of an interrupter element (112, 112?) in the control device (62) which disrupts, via a delay member (116), the connection to the control inputs of the actuators (92, 94) associated drive units and/or the feed units (98, 100) for the purpose of power or pressured oil feed once the remote control elements (52) of the remote control device (50) are in the off-position.

Abstract: The invention relates to a distributor device for thick matter, especially for concrete. The distributor device (16) comprises a concrete distributing boom (18) carrying a conveying conduit (20), which has at least two boom arms (30 to 36) that can be swiveled about horizontal articulation axes (38 to 44) relative to one another or relative to a boom support (26). At least one of the boom arms, preferably the base arm (30), is telescopically movable. In order to be adaptable to the telescoping movements, the conveying conduit is assembled from three interlinked conduit sections in the area of the telescoping boom arm. A first conduit section (58) is rigidly linked with the stationary member (46), while a second conduit section (60) is rigidly linked with the extensible telescoping member (48). The device further comprises an intermediate section (62) which is connected with its ends (64, 66) to the first and the second conduit section (58, 60) and which is configured as a flexible pipe.

Abstract: A large manipulator with an articulated mast (22) is pivotally connected to a mast base (21) that is rotatable about a vertical axis. The mast (22) comprises at least three mast arms (23 to 27) which are pivotable to a limited extent about horizontal articulated axis (28 to 32) that are located parallel to each other, the pivoting movement being relative to the mast base (21) or an adjacent mast arm (23 to 27) and being performed by means of a respective drive unit (34 to 38). A control unit is provided with coordinate transformer (74, 76) which responds to a given guiding parameter (r) and measured angular values (??) that are determined by means of angle sensors (44 to 48) located on the mast arms (23 to 27). The coordinate transformer (74, 76) does a conversion into movement signals (??v) for the drive units (34 to 38) in accordance with predefined path/slew characteristics, the movement signals being related to the articulation axis.

Abstract: A device for operating an articulated arm of a large manipulator connected to a boom base. The large manipulator comprises an articulated boom (22), composed of three boom arms (23 to 27), the boom arms of which may each be pivoted around mutually parallel horizontal articulation axis (28 to 32), in a limited manner. Furthermore, a control device (74), for the boom displacement is provided, which may be controlled from a remote controller (50) over a data transmission path (68).

Abstract: The invention relates to a distributor device for thick matter, especially for concrete. The distributor device (16) comprises a concrete distributing boom (18) carrying a conveying conduit (20), which has at least two boom arms (30 to 36) that can be swiveled about horizontal articulation axes (38 to 44) relative to one another or relative to a boom support (26). At least one of the boom arms, preferably the base arm (30), is telescopically movable. In order to be adaptable to the telescoping movements, the conveying conduit is assembled from three interlinked conduit sections in the area of the telescoping boom arm. A first conduit section (58) is rigidly linked with the stationary member (46), while a second conduit section (60) is rigidly linked with the extensible telescoping member (48). The device further comprises an intermediate section (62) which is connected with its ends (64, 66) to the first and the second conduit section (58, 60) and which is configured as a flexible pipe.

Abstract: A method for controlling a thick matter pump comprising two delivery cylinders (10) emerging, via two openings (12), into a material reservoir (14), associated with two delivery pistons (26), symmetrically synchronized relative to said cylinders, and a branch pipe 18 arranged inside the material reservoir (14), capable of being connected, on the input side, alternatively to one of the openings of the delivery cylinders with exposing of the other opening, the output side connected to a conveyance conduit (20). When the pumping is interrupted, thick matter, liquid concrete for example, is sucked up, via the delivery cylinder temporarily communicating with the reservoir, and is delivered, via the other cylinder (10), connected to the branch pipe (18), so as to form a column of thick matter through the delivery pipe (20), towards its output.

Abstract: The invention relates to a device for monitoring the safety of an articulated mast (22), especially of a concrete distribution mast, whose mast segments (23 to 27) are controlled via a remote control (50) and a control device (62) that is responsive to the remote control signals using a computer-assisted circuit arrangement (80). Safety monitoring is made possible by the provision of an interrupter element (112, 112′) in the control device (62) which disrupts, via a delay member (116), the connection to the control inputs of the actuators (92, 94) associated drive units and/or the feed units (98, 100) for the purpose of power or pressured oil feed once the remote control elements (52) of the remote control device (50) are in the off-position.

Abstract: A device for operating an articulated arm of a large manipulator connected to a boom base. The large manipulator comprises an articulated boom (22), composed of three boom arms (23 to 27), the boom arms of which may each be pivoted around mutually parallel horizontal articulation axis (28 to 32), in a limited manner. Furthermore, a control device (74), for the boom displacement is provided, which may be controlled from a remote controller (50) over a data transmission path (68).

Abstract: The present invention relates to a pipe switch for a dual-cylinder thick-liquid pump, wherein said system comprises a pivoting pivot pipe (36) located in the front of a glasses-like wear plate (34) on the cylinder side as well as a wear ring (38) which is capable of limited axial displacement at the end of the pivot pipe (36) on the cylinder side. The ring can be pressed against the wear plate (34) by the hydrostatic pressure existing inside said pivot pipe. The wear ring 38 has a centering portion (46) guided on an axis-parallel centering surface (42) of the pivot pipe (36) as well as a sealing part (54) resting against the wear plate (34) through an abutment surface (52) on the cylinder side. The pivot pipe (36) and the sealing part (54) of the wear ring (38) have annular surfaces (56, 58) which face each other and which are axially spaced from one another by an annular gap (59) opened towards the inside of the pipe.

Abstract: The invention relates to a sliding device for two-cylinder pumps for liquids, especially designed for concrete pumps. The sliding device (20) has a pivot pipe (16) which is bent and has substantially a C-shape. The pivot pipe is fixedly connected, at its upper end, to an extension pipe (42) protruding over a back wall (24) of a material feeding bin and connected, at its end opposite the pivot pipe, to a discharge conduit through a pipe rotating connection. The pivot pipe is placed in such a way that it is able to pivot about the axis of the extension pipe so that its other end is connected alternatively to the openings of the discharge cylinder (10). In order to ensure reliable operation in spite of frictional wear in the extension pipe (42), the invention provides for a support pipe (84) which coaxially overlaps the extension pipe (42), is fixedly connected to the upper end of the pivot pipe and extends over least on one part of the extension pipe (42).

Abstract: The invention concerns a device for opening and closing a closure cap (16) fitted over a cleaning aperture (10) in the floor of the discharge container (12) of a pump (14) for thick-bodies fluids. The cap (16) is linked to a hydraulic drive unit (20) and can be swung out hydraulically, when a control valve (48) is actuated, into the open position in which the discharge outlet is left open. The cap (16) is swung back into the closed position by means of a hand-operated lever (23), the hydraulic drive unit (20) being returned at the same time to its initial position.

Abstract: A large manipulator, especially for self-propelled concrete pumps includes a rotary head that rotates about a vertical axis on a mast stand, and a jointed or articulated mast composed of at least three mast arms. The mast arms of the jointed mast can be swivelled to a limited extent about horizontal, mutually parallel axes relative to the adjoining rotary head or mast arm using a corresponding drive unit in each case. The jointed mast is operated by a remote control device which has a signal transmitter situated at the mast top and a control unit. The signal transmitter drives a computerized coordinate field device actuating the drive units according to a displacement path relative to the momentary position of the mast top as directly indicated by means of the control unit.

Abstract: The invention relates to a large manipulator, especially for truck mounted concrete pumps. A chassis bears a mast base rotatable about a vertical pivot and an articulated mast consisting of at least three arms. The arms can be pivoted to a limited extent about horizontal, mutually parallel axes in pairs in relation to the adjacent base or arm by means of a drive system. The articulated mast is actuated via a remote control device with control levers.

Abstract: A one-piece terminal block (73) is provided as a hydraulic linking element as well as a mechanical carrier for control valves (68 to 72) of a boom control unit, for an operating mode selector valve (74), and for switching elements of a pressure supply device (77). A pressure line (119), return line (132), control line (166), and a further return line (167,168) are designed as bores extending in an axial direction of the terminal block, from which connection channels originate which terminate within terminal arrays (163, 163.sup.I to 163.sup.IV) in a bore layout for the valves. Sections (102') of a load feedback line (102), which are serially connectable to each other by comparative valves (114) are formed by individual longitudinal bores (188,188.sup.I to 188.sup.