Concrete pumping system with energy-saving hydraulic circuit

Abstract

The invention provides a concrete pumping system with an energy-saving hydraulic circuit. The concrete pumping system comprises an oil tank, a load sensing variable pump, a switching valve, an overflow valve, a reversing valve and a concrete pumping jar; the load sensing variable pump comprises a load sensing valve element, a spring and a variable jar; the switching valve comprises a two-site four-way solenoid valve, a shuttle valve and a damping; an oil inlet of the load sensing variable pump is connected with the oil tank, a high pressure oil outlet B of the load sensing variable pump is communicated with a P port of the switching valve, when the two-site four-way solenoid valve is at the left site, the high pressure oil output from the B port of the load sensing variable pump is communicated with the P port of the switching valve, after passing through the damping, the high pressure oil, entered from the P port of the switching valve, passes through the two-site four-way solenoid valve and then outflows to the oil tank, at the moment, a Pb port of the switching valve is externally connected with an oil source, so as to enable a tilting tray of the load sensing variable pump to swing toward a small tilt angle, and output small flow, and the right site of the reversing valve is open, and the oil source enters a rodless cavity of the concrete pumping jar to eject out an oil jar.

Description

technical field [0001] The invention relates to a concrete pumping system with an energy-saving hydraulic circuit. Background technique [0002] Existing concrete pumping systems include direct quantitative pumping systems and variable variable pumping systems, such as figure 1 As shown, the quantitative pumping system is that after the gear pump absorbs oil from the oil tank, it flows into the reversing valve after passing through the manual throttle valve, and then enters the motor to drive the motor to rotate. The flow into the motor is adjusted by a manual throttle valve to control the speed of the motor. The reversing valve controls the direction of rotation of the motor. The overflow valve plays the role of safety protection. This quantitative pump system has the defect of large energy loss. When the high pressure is small In the flow condition, although the pressure is not high, but because of the large flow, it needs to flow out from the throttle port of the rever...

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Problems solved by technology

The overflow valve plays the role of safety protection. This quantitative pump system has the defect of large energy loss. When the high pressure is small In the flow condition, although the pressure is not high, but because of the large flow, it needs to flow out from the throttle port of the reversing valve, which will also cause a lot of energy loss; figure 2 As shown, the variable pumping system adopts a load-sensing hydraulic system composed of a fuel tank, a load-sensing variable pump, a motor, and a load-sensing proportional valve. flow rate, the drive motor rotates at different speeds, and the speed of the motor is not affected by the load pressure. This hydraulic system can meet the requirements of two working conditions: low pressure, large flow, and high pressure, small flow. The overflow valve plays a role of safety protection, but this The manufacturing and processing precision of this kind of load sensing proportional valve is very high, the price is too expensive, the anti-pollution ability is poor, and the maintenance and use cost is high. For the hydraulic system of the concrete pumping system with poor working conditions, The practicability is not strong, and at the same time, in the existing concrete pumping system, for the cleaning of the concrete pumping cylinder, a separate structure needs to be set up to pull out the piston rod of the concrete pumping cylinder, which requires additional hydraulic circuits and equipment, which is time-consuming and laborious

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