ROCK valve

The most important component of a two-piston concrete pump is the concrete valve. Under high pressure, it switches between the two delivery cylinders and ensures that the flow of concrete from the delivery cylinders into the outlet is as friction-free as possible. With the unique ROCK valve, all concrete pumps from SCHWING have a concrete valve, which is characterized by extremely low wear, a long service life and a very good cleaning ability. Developed by SCHWING on the basis of the negative experiences with the S-pipe also developed by SCHWING and put on the market in 1983, it is still the benchmark for economic efficiency and robustness.

DIRECT DRIVE

The DirectDrive developed by SCHWING engineers is a completely new drive concept for the boom elements of a truck-mounted concrete pump. Instead of a hydraulic cylinder, a hydraulic rotary actuator is installed in the joint, allowing for boom movements that were unthinkable until now. This grants the third boom element a remarkable opening angle of 330°, while the fourth boom element can endlessly rotate through a full 360°. SCHWING’s DirectDrive components are manufactured in Austria and Germany.

The Reptor boom. Exceptionally flexible.

The use of truck-mounted concrete pumps in halls and in front of buildings with retracted boom, requires much experience and permanent attention. The more flexible and easier it is to operate the boom of a concrete pump, the quicker and more safe such demanding concreting tasks can be mastered. Therefore, the 5-section Reptor boom has particularly large opening angles at the joints D and E, which allow an extraordinary mobility of the boom. Due to the roll-folding, the Reptor boom is intuitive to operate and easy to control even in demanding applications. Thus, it is an ideal tool for pump applications in halls or for threading into the building. The truck-mounted concrete pump S 38 SX is equipped with the Reptor boom.

Poppet valve system (STVE)

The poppet valve system (STVE) developed by SCHWING is used for pumping fine-grained, pasty sludge with SCHWING sludge pumps. With the valve system, output rates of up to 230 m³/h and a continuous output pressure of up to 150 bar can be achieved. The poppet valves prevent by the safe separation of the pressure side of the suction side during the switching process, a return flow of the pumped material from the pipeline into the pump, thus ensuring a quiet and low-pulsing pump operation. The easy maintenance and the low maintenance effort guarantee low cost of ownership and high availability. The poppet valve system can be equipped with either a single (1D) or double pressure outlet (2D). With the double outlet (2D), a sludge pump can deliver the material to two different feed points discontinuously. The single pressure outlet (1D) allows a continuous pumping of the material to a feed point.

For pumping sludges with rough contaminations and large foreign bodies, the ROCK valve from SCHWING is the right valve system.

Symmetrical Switching

All Schwing concrete pumps come standard with Symmetrical Switching, which provides faster switching of the Rock Valve, for a smoother and quieter operation. While Symmetrical Switching is great for everyday pumping, the benefits are greater when pumping stiff mixes that generate higher concrete pressures, particularly when pumping high-rise buildings.

In operation, both switching points are at the water box end of the differential cylinders allowing oil to feed evenly into the bridge hose on both switch points. Symmetrical Switching also allows for easier Ram change because the right-hand material cylinder retracts completely, even when plumbed on the piston side.

SCC (Schwing Cab Control)

The 5” SCC touch screen allows operators to safely switch between pumping and driving modes. The system will not allow the transfer case to switch if unsafe conditions are present. The transfer case will not switch; if the drive shaft is turning over 20 RPM, the truck is in drive gear, the parking brake is not set or if the clutch is not depressed. The SCC will display under speed and over speed warnings if the gear ratio is not correct (lower gear than what is required). It will also warn operators if the machine over speeds the hydraulic pumps, in that event, SCC will reduce RPM’s back to idle and flash outrigger lights. Status messages provide the operator valuable feedback if faults occur.

Additional cameras can be added to the driver side, passenger side, cab, hopper and tip section of the machine. With optional cameras, the in-cab display is increased to 7” with DVR capabilities.

Operators can also raise or lower installed pusher axles, turn on outrigger / beacon lights and manually control the truck throttle in Pumping mode. The SCC maintenance screen displays PTO hours, fuel level and drive shaft speed. System inputs and outputs are displayed on the PLC IO screen, assisting in troubleshooting. The whole system can be bypassed via key switch in the event of system failure.