MarketsHydraulic system in building materials and construction industry

Back to Markets

    In recent years, hydraulic technology has been increasingly widely used in cement production machinery and production lines and other construction material machinery and equipment.

    The application of hydraulic technology in the construction industry is also quite extensive. In fact, it is difficult to clearly distinguish between construction machinery and construction machinery. In addition to commonly used earthwork machinery (such as excavating machinery, loading machinery, earth-moving machinery, rock drilling machinery, etc.), hydraulic technology has been used in construction machinery such as steel bar shearing, bending machinery, compaction machinery, and concrete conveying machinery. widely used.


     Picture shows the schematic diagram of the hydraulic system of the high-pressure grouting machine. The actuator of the system is the main hydraulic cylinder 10, which is used to drive the mold to realize fast forward, slow forward, and fast backward movements. The flow rate required by the system is relatively not too large, so the high-pressure pump 1 and the low-pressure pump (main pump) 2 are used for oil supply. The pressure setting and unloading control of pump 1 is realized by electromagnetic overflow valve 5, and the pressure of pump 2 is overflowed. Valve 3 is set. The electromagnetic reversing valve 7 with H-type neutral function is used for the reversing of the cylinder 10 and the unloading of the pump 2 during the system pressure maintaining period. The hydraulic control check valve 6 is used for system pressure maintaining, the electromagnetic reversing ball valve 8 and the throttle valve 9 They are used to adjust the oil sealing and pressure release time during the pressure holding period. The pressure relays 12, 13, and 14 are the signaling devices when the low-pressure pump unloading starts, the system pressure starts, and the pressure release ends, respectively.

(图1)


    When electromagnets 1YA and 3YA are energized, the electromagnetic reversing valves in valve 7 and valve 5 are switched to the right and upper positions respectively. Pump 1 passes through valve 6, pump 2 passes through valve 7 and valve 11 at the same time to the rodless cylinder 10 The cavity supplies oil, the rod cavity returns oil through valve 7, and the piston rod drives the mold to advance quickly. When the system pressure increases to a certain value, the pressure relay 12 sends a signal, the electromagnet 1YA is de-energized to reset the valve 7 to the neutral position, and the pump 2 is unloaded , The high-pressure pump 1 continues to supply oil to the cylinder 10, at this time the mold is fully sealed and closed at a slow speed; then the grouting starts, and as the slurry pressure increases, the hydraulic system pressure gradually increases, and the system pressure increases to the required level At the pressure value of the clamping force, the pressure relay 13 sends a signal, the high-pressure pump 1 stops, and the system starts to maintain pressure. At the end of pressure holding, the electromagnet 4YA is energized to switch the reversing ball valve 8 to the upper position, and the rodless cavity of the cylinder 10 is released through the bypass throttle circuit (valves 9 and 8) (the release time is adjusted by adjusting the opening of the throttle valve 9. When the pressure reaches a certain value, the pressure relay 14 sends a signal, the solenoid 2YA is energized to switch the reversing valve 7 to the left position, and the pressure oil of the pump 2 enters the rod cavity of the cylinder 10 through the valve 7 and conducts reversely. The hydraulically controlled check valve 6, the hydraulic cylinder quickly returns, and the solenoid 3YA is de-energized to reset the electromagnetic reversing valve in the valve 5 (lower position), and the pump 1 is unloaded through the overflow valve 5. So as to complete a work cycle.


Related Products