Driven closed-circuit piston pumps are commonly used in concrete truck mixing drums to provide the necessary hydraulic power for rotating and tilting the drum. These pumps are variable displacement axial piston pumps specifically designed for closed loop hydraulic systems. Here's how they work and what role they play in the operation of concrete mixer truck drums: 1. Closed-circuit system: Closed-loop hydraulic system, also known as closed-circuit, means that the hydraulic oil circulates in a closed loop between the pump and the hydraulic motor without returning to the tank. This setup is particularly effective for high power applications requiring continuous flow of hydraulic power. 2. Variable displacement: The closed-circuit piston pump driven in the concrete mixer truck is usually a variable displacement type. This means that the displacement of the pump, and thus the flow, can be varied to meet the needs of the hydraulic system. 3. Hydraulic power transmission: The pump is directly driven by a power source, such as a truck engine, which provides mechanical power to the input shaft of the pump. The pump converts mechanical power to hydraulic power, providing pressurized hydraulic fluid to the hydraulic motor in the mixer drum circuit. 4. Mixing drum rotation: The hydraulic motor connected to the mixing drum receives pressurized hydraulic oil from the pump. By controlling the displacement of the pump, the rotational speed and torque of the drum can be adjusted. This allows the drum speed to be varied according to concrete mixing requirements. 5. Tilting mixing drum: Some concrete mixer trucks also use hydraulic system to tilt the mixing drum to discharge concrete. In this case, another hydraulic motor is used to drive the tilt mechanism. A driven closed circuit piston pump provides the necessary hydraulic power to tilt the drum as required. JR-R-S51B-LS-25-20-NN-N-3-S1AE-A2N-NNN-JJJ-NNN JRRS51BLS2520NNN3S1AEA2NNNNJJJNNN JR-R-S51B-LS-25-20-NN-N-3-S1AE-A9N-NNN-JJJ-NNN JRRS51BLS2520NNN3S1AEA9NNNNJJJNNN JR-R-S51B-LS-25-20-NN-N-3-S1BE-A2N-NNN-JJJ-NNN JRRS51BLS2520NNN3S1BEA2NNNNJJJNNN JR-R-S51B-LS-25-20-NN-N-3-S1NE-A2N-NNN-JJJ-NNN JRRS51BLS2520NNN3S1NEA2NNNNJJJNNN JR-R-S51B-LS-25-20-NN-N-3-S1RE-A2N-NNN-JJJ-NNN JRRS51BLS2520NNN3S1REA2NNNNJJJNNN JR-R-S51B-LS-25-20-NN-N-3-S1RF-A2N-FFF-JJJ-NNN JRRS51BLS2520NNN3S1RFA2NFFFJJJNNN JR-R-S51B-LS-25-20-NN-N-3-S1VE-A2N-NNN-JJJ-NNN JRRS51BLS2520NNN3S1VEA2NNNNJJJNNN JR-R-S51B-LS-25-25-NN-N-3-C2NE-A8N-NNN-JJJ-NNN JRRS51BLS2525NNN3C2NEA8NNNNJJJNNN JR-R-S51B-LS-26-15-NN-N-3-S1TE-A2N-NNN-JJJ-NNN JRRS51BLS2615NNN3S1TEA2NNNNJJJNNN JR-R-S51B-LS-26-20-NN-N-3-C2NH-A8N-NNN-JJJ-NNN JRRS51BLS2620NNN3C2NHA8NNNNJJJNNN JR-R-S51B-LS-26-20-NN-N-3-C3NH-A8N-NNN-JJJ-NNN JRRS51BLS2620NNN3C3NHA8NNNNJJJNNN JR-R-S51B-LS-26-20-NN-N-3-S1BE-A2N-NNN-JJJ-NNN JRRS51BLS2620NNN3S1BEA2NNNNJJJNNN JR-R-S51B-LS-26-26-NN-N-3-C2AE-A8N-NNN-JJJ-NNN JRRS51BLS2626NNN3C2AEA8NNNNJJJNNN JR-R-S51B-LS-27-14-NN-N-3-C3NE-A8N-NNN-JJJ-NNN JRRS51BLS2714NNN3C3NEA8NNNNJJJNNN JR-R-S51B-LS-28-14-NN-N-3-C2NE-A8N-NNN-JJJ-NNN JRRS51BLS2814NNN3C2NEA8NNNNJJJNNN JR-R-S51B-LS-28-20-NN-N-3-C2AF-A8N-FFF-JJJ-NNN JRRS51BLS2820NNN3C2AFA8NFFFJJJNNN JR-R-S51B-LS-28-20-NN-N-3-C2HE-A8N-NNN-JJJ-NNN JRRS51BLS2820NNN3C2HEA8NNNNJJJNNN JR-R-S51B-LS-28-20-NN-N-3-C2NE-A8N-NNN-JJJ-NNN JRRS51BLS2820NNN3C2NEA8NNNNJJJNNN JR-R-S51B-LS-28-20-NN-N-3-C2RF-A8N-FFF-JJJ-NNN JRRS51BLS2820NNN3C2RFA8NFFFJJJNNN JR-R-S51B-LS-28-20-NN-N-3-C3AE-A8N-NNN-JJJ-NNN JRRS51BLS2820NNN3C3AEA8NNNNJJJNNN 6. Proportional control: Many modern closed-circuit plunger pumps are equipped with a proportional control mechanism. This means that the displacement of the pump is adjusted proportionally to the input signal received from the operator or from an automatic control system. This allows precise control of the speed and inclination angle of the mixing drum. 7. Energy Efficiency: Closed loop systems are generally more energy efficient compared to open loop systems because they provide hydraulic power only when needed, reducing energy waste. Concrete truck mixer drums are designed to transport, mix and transport concrete to construction sites. A hydraulic system with a driven closed circuit piston pump plays a key role in providing the power needed to rotate and tilt the drum. The ability to control the speed of rotation and tilt of the drum allows the operator to efficiently adapt to varying concrete mixing and placing requirements. It should be noted that the specific design and configuration of the hydraulic system of different concrete mixer truck manufacturers may be different. Therefore, the actual hydraulic system used may have additional features or changes tailored to the particular mixer model. Let’s move on to a detailed look at the advantages of using a driven closed circuit piston pump in the concrete mixer drum: 1. Stable operation: Driving the closed-circuit piston pump can control the hydraulic system smoothly and accurately. The variable displacement feature allows the pump to smoothly adjust flow and pressure for precise control of the rotational and tilting motion of the mixing drum. 2. High torque at low speed: These pumps can provide high torque even at low drum speed. This feature is critical to starting and maintaining rotation of heavy-duty drums, especially when dealing with hard or viscous concrete mixes. 3. Reduced Noise: Closed-loop hydraulic systems (including driving piston pumps) tend to be quieter than open-loop systems. This results in a more pleasant working environment for the operator and those nearby during concrete mixing and unloading operations. 4. Durability and reliability: Drive closed circuit piston pumps are known for their rugged construction and reliability. They are designed to withstand the rigors of concrete mixer truck applications, extending their life with proper maintenance. 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Efficient use of engine power: Since these pumps are directly driven by the truck engine, the hydraulic system can efficiently use available engine power to rotate and tilt the mixing drum. This reduces wasted energy and helps improve the overall fuel efficiency of the truck. 6. Compact design: The compact design of the drive closed-circuit piston pump enables it to be easily installed in the limited space of a concrete mixer truck, which is very suitable for such mobile applications. 7. Proportional Control Option: The proportional control feature of these pumps allows for fine-tuning of the drum rotation and tilting speed, helping to better control the concrete mixing and discharge process. 8. Adaptability to different loads: The pump has a variable displacement, and the hydraulic power output can be adjusted according to the load requirements, and it can operate efficiently under various concrete load conditions. 9. Low heat generation: Closed loop hydraulic systems generate less heat than open loop systems. This reduces the risk of hydraulic oil overheating and helps improve the overall efficiency and service life of the system. 10. Low Maintenance: Driven closed circuit piston pumps generally require less maintenance than some other pump types. Routine inspections, fluid checks and basic maintenance tasks ensure optimal pump performance. To sum up, driving a closed-circuit piston pump plays a vital role in the efficient and reliable operation of concrete mixer trucks. Their ability to provide variable hydraulic power, smooth control and adaptability to varying operating conditions make them the first choice for concrete mixing and unloading applications. Regular maintenance and proper operation are critical to maximizing the life and performance of these hydraulic systems.