A boom system for a concrete-delivery device includes a plurality of booms which are pivotably interconnected. At least one of the booms has a recess along its length, the recess configured to at least partially receive an adjacent boom when the boom system. is in a retracted position. Side walls of the boom are extended to define the recess in the form of a channel. The recess may have a depth greater than or equal to a height of the adjacent boom so that the adjacent boom is received within the recess when the boom system is in the retracted position. Alternatively, the recess may have a depth less than a height of the adjacent boom so that the adjacent boom is only partially received in the recess when the boom system is in the retracted position.

A hydraulic rotary drive includes a first rotary drive element and at least two annular pistons connected to the first rotary drive element in a rotationally fixed manner and configured to be axially movable on the first rotary drive element between two end positions. Each annular piston has two annular spur serrations directed away from one another. The hydraulic rotary drive includes a second rotary drive element with ring type serrations that are complementary to the spur serrations of the annular pistons. The hydraulic rotary drive includes a control unit that is configured to control supply of hydraulic fluid to the annular pistons to cause a reciprocating movement of the annular pistons on a shaft in accordance with an operating signal. The hydraulic rotary drive includes a sensor arrangement communicatively coupled to the control unit and arranged to detect the positions of the annular pistons along respective sliding paths.

A hydraulic rotary drive includes a first rotary drive element and at least two annular pistons connected to the first rotary drive element in a rotationally fixed manner and configured to be axially movable on the first rotary drive element between two end positions. Each annular piston has two annular spur serrations directed away from one another. The hydraulic rotary drive includes a second rotary drive element with ring type serrations that are complementary to the spur serrations of the annular pistons. The hydraulic rotary drive includes a control unit that is configured to control supply of hydraulic fluid to the annular pistons to cause a reciprocating movement of the annular pistons on a shaft in accordance with an operating signal. The hydraulic rotary drive includes a sensor arrangement communicatively coupled to the control unit and arranged to detect the positions of the annular pistons along respective sliding paths.

The invention relates to a method for controlling the movement of an end hose arranged on a concrete placement boom of a concrete pump with a display device arranged in the region of the end hose by means of a control device, comprising the following steps: outputting a signal for displaying a predefined movement direction to the display device; receiving a predefined speed for moving the end hose from an actuation device; and calculating and outputting control signals for controlling the concrete placement boom in such a way that the end hose is moved in the predefined movement direction at the predefined speed. The invention also relates to a corresponding control device, a system, a concrete placement boom and a computer program for controlling the movement of an end hose arranged on a concrete placement boom of a concrete pump.

A Z-axis that is integrated with storage, commixture and extrusion of materials, including a vertically-moving bucket, and a vertically-moving unit connected to the vertically-moving bucket. The vertically-moving unit can drive the vertically-moving bucket to move vertically. The vertically-moving bucket is used to store printing materials. A printing nozzle connected to the vertically-moving bucket is provided at the bottom of the vertically-moving bucket, which is connected with the printing nozzle through a stirring unit. The vertically-moving bucket replaces the existing vertically-moving axis, so that the printing nozzle can directly communicate with the vertically-moving bucket without pipelines to connect the printing nozzle to the vertically-moving bucket. Also, a 3D building printer that does not need to erect a relaying bucket in the sky, which solves the problem of pipeline blockage and cleaning.

A Z-axis that is integrated with storage, commixture and extrusion of materials, including a vertically-moving bucket, and a vertically-moving unit connected to the vertically-moving bucket. The vertically-moving unit can drive the vertically-moving bucket to move vertically. The vertically-moving bucket is used to store printing materials. A printing nozzle connected to the vertically-moving bucket is provided at the bottom of the vertically-moving bucket, which is connected with the printing nozzle through a stirring unit. The vertically-moving bucket replaces the existing vertically-moving axis, so that the printing nozzle can directly communicate with the vertically-moving bucket without pipelines to connect the printing nozzle to the vertically-moving bucket. Also, a 3D building printer that does not need to erect a relaying bucket in the sky, which solves the problem of pipeline blockage and cleaning.

The invention relates to the field of engineering machinery, and discloses a pumping control method and apparatus, a material distribution method and apparatus as well as a distribution device. The pumping control method includes: calculating an initialized pumping speed; controlling a distribution device to pump at the initialized pumping speed; and dynamically adjusting the pumping speed of the distribution device in real time according to a completed real-time distribution volume and real-time distribution time during the pumping of the distribution device until the real-time distribution volume is a desired distribution volume. Therefore, the accuracy of a final distribution volume is improved. The distribution method includes: controlling a distribution device to perform distribution at a to-be-distributed location in a preset distribution area; and after distribution at the to-be-distributed location is completed, determining a next to-be-distributed location in the preset distribution area and performing distribution at the next to-be-distributed location until distribution at each to-be-distributed location in the preset distribution area is completed. Therefore, automatic distribution is achieved.

A method for producing a shaped body from a curable material, in particular from a mineral binder composition, wherein the curable material is applied layer by layer in an additive method, in particular in an additive free-space method, by a printing head that can be moved in at least one spatial direction and wherein an application rate of the curable material and the temporal development of strength of the curable material are coordinated with each other.

A method for producing a shaped body from a curable material, in particular from a mineral binder composition, wherein the curable material is applied layer by layer in an additive method, in particular in an additive free-space method, by a printing head that can be moved in at least one spatial direction and wherein an application rate of the curable material and the temporal development of strength of the curable material are coordinated with each other.

The disclosure relates to a printer device as well as a method for building a printer guide structure of a passenger transport system configured as an escalator or moving walkway in an existing building. The printer device comprises at least one printer guide device, a 3D concrete printer device, which is arranged such that it can be moved along the printer guide device, and a printer controller.