The invention relates to a method and a device for controlling the delivery rate (P.sub.Q) of a concrete pump (1) for filling a formwork arrangement (2) with a pumpable filling compound (3) as a function of curing-relevant material and environmental parameters (RST), after which the installed filling compound (3) sets within the formwork arrangement (2), comprising the following steps: determining a permissible climbing speed (vsz) for filling the formwork arrangement (2) with the filling compound (3) on the basis of the material and ambient parameters (RST), measuring the static filling compound pressure (p.sub.F) acting on the formwork arrangement (2) during filling, calculating the permissible delivery rate (P.sub.Q) of the concrete pump (1) as a function of the determined permissible rate of ascent (vsz) and the measured static filling compound pressure (p.sub.F) at the formwork arrangement (2).

Hydro excavation vacuum apparatus that process spoil material onboard the apparatus by separating water from the cut earthen material are disclosed.

A system for monitoring a dual cylinder concrete pumping apparatus and a transition valve operated by an actuator. The system including position sensors to detect the position of pistons in the dual cylinders and the actuator. Additional sensors can monitor various aspects of the concrete pumping apparatus. A processor receives information from the sensors and transmits data to a monitor. When sensor data is outside of predetermined parameters, the processor sends an alert notice and a performance snapshot of the system to the monitor.

Hydro excavation vacuum apparatus that process spoil material onboard the apparatus by separating water from the cut earthen material.

A hydraulic drive system for a construction material pump has a hydraulic circuit for hydraulic fluid, a feed pump which is designed to feed hydraulic fluid into the hydraulic circuit, at least one controllable pressure-limiting valve unit, which is designed for variable adjustment of a limit pressure of hydraulic fluid of at least one portion of the hydraulic circuit within a pressure range, and a control unit. The control unit is designed to control the pressure-limiting valve unit according to at least one operating parameter of the hydraulic drive system and/or according to the hydraulic fluid in such a way that the pressure-limiting valve unit adjusts the limit pressure of the portion of the hydraulic circuit.

An auto-reversing driveshaft system/method configured to traverse in alternating longitudinal directions along a common driveshaft axis is disclosed. The system utilizes right-hand-thread (RHT) and left-hand-thread (LHT) channels along a target driveshaft (TDS) to engage dual drive pins (DDP) that are mechanically linked to an axial engagement collar (AEC) mechanically coupled to a motion driver platform (MDP). The AEC may be configured as a two-piece symmetric collar (TSC) in which the DDP are individually retained. The RHT and LHT are configured to implement a selected forward traverse rate (FTR) and reverse traverse rate (RTR) respectively for the DDP and AEC along the longitudinal axis of the TDS. The FTR and RTR may vary along the longitudinal axis of the TDS. The system and method are particularly applicable to the implementation of level winders, pumps, and/or situations where variable longitudinal traversal rates along the TDS are desired.

A pump system/method configured to provide substantially constant flow of concrete, cement, or other material is disclosed. The system integrates a trapezoidal cutting ring and spectacle plate in conjunction with lofted transitional interfaces to the mechanical pump cylinder rams and output ejection port to ensure that pressurized discharge concrete material is not allowed to be relaxed nor backflow into the material sourcing hopper. The trapezoidal cutting ring is configured to completely seal off the trapezoidal spectacle ports as it smoothly transitions between the mechanical pump input ports during cycle changes thus generating a more uniform output flow of concrete while eliminating hopper backflow and hydraulic fluid shock. A control system is configured to coordinate operation of the hydraulic pump cylinder rams and cutting ring to ensure that output ejection port pressure and material flow is maintained at a relatively constant level throughout all portions of the pumping cycle.

A pulsation-free wet spraying machine resolves the issue of pulsing during pumping of a concrete spraying machine. The wet spraying machine includes a frame, a pumping mechanism, a swing mechanism and a hydraulic system, wherein the pumping mechanism includes a hopper, a material chamber, a concrete feeding mechanism, an auxiliary feeding mechanism and a distribution valve, the hopper is disposed above the material chamber, the concrete feeding mechanism and the auxiliary feeding mechanism each include a hydraulic cylinder, a concrete piston and a concrete cylinder, the concrete cylinder of the concrete feeding mechanism and an auxiliary concrete cylinder of the auxiliary feeding mechanism are both connected with the material chamber, a discharge port is disposed on the material chamber, sealing between the distribution valve and the discharge port is provided by a sealing ring, the distribution valve is disposed inside the material chamber, a front friction plate and a rear friction plate are further disposed inside the material chamber, the swing mechanism includes a swing hydraulic cylinder, a mandrel, a swing arm and a swing hydraulic cylinder base, and the mandrel drives the distribution valve to swing. In addition, The pulsation-free wet spraying machine stably feeds a material, has a compact structure, and is wear-resistant.

A pulsation-free wet spraying machine resolves the issue of pulsing during pumping of a concrete spraying machine The wet spraying machine includes a frame, a pumping mechanism, a swing mechanism and a hydraulic system, wherein the pumping mechanism includes a hopper, a material chamber, a concrete feeding mechanism, an auxiliary feeding mechanism and a distribution valve. The hopper of the pumping mechanism is disposed above the material chamber. The distribution valve is disposed inside the material chamber, the concrete feeding mechanism and the auxiliary feeding mechanism both include a hydraulic cylinder, a concrete piston and a concrete cylinder, a discharge pipe is a three-way pipe fixed at a side surface of the material chamber, an auxiliary discharge pipe of the discharge pipe is connected with an auxiliary concrete cylinder, and a through hole is disposed on the auxiliary concrete cylinder. The swing mechanism includes a swing hydraulic cylinder, a swing arm and a swing hydraulic cylinder base, an auxiliary piston rod of the auxiliary feeding mechanism passes through a mandrel to push an auxiliary concrete piston to move inside the auxiliary concrete cylinder. In addition, the pulsation-free wet spraying machine stably feeds a material, has a compact structure, and is wear-resistant.

A pump for high viscosity materials is mounted on a rectangular frame that fits through a standard doorway. Quick detach latches allow removal of the grate, the hopper or the console, including the control box, from the frame for safer and lighter transportation of the pump. Extendable handles facilitate lifting, moving, and storing the pump. Pivotable wheels with locking mechanisms allows the pump to be moved in any direction by a single user.