Dual-roll rolling machine hydraulic pressing down system and operation method thereof

Abstract

The invention relates to a dual-roll rolling machine hydraulic pressing down system and an operation method thereof and belongs to the technical field of hydraulic system pressurizing. The system comprises two symmetrical oil circuits. Each oil circuit comprises a plunger pump, a pressing down oil cylinder, an electromagnetic overflow valve, a one-way valve, a filter, an energy accumulator, an electromagnetic ball valve, a throttling valve, a first one-way throttling valve, a pressure sensor and the like. Due to the fact that the one-way valve, a hydraulic one-way valve and the electromagnetic ball valve in the work circuit of the hydraulic pressing down system is good in pressurizing performance and the energy accumulator can supplement system pressure, the system is long in pressurizing time, stable in pressure and reliable in pressurizing. In the mean time, a plunger stops during pressurizing, up and down waving of pressure during operation is eliminated completely, plate shape quality is improved greatly, and power consumption during production is saved.

Description

technical field [0001] The invention relates to a hydraulic pressing system of a twin-roll casting and rolling mill and an operation method thereof, belonging to the technical field of pressure maintaining of hydraulic systems. Background technique [0002] Aluminum strip casting and rolling is a process between hot rolling and casting. It injects aluminum solution between two water-cooled casting rolls, and produces aluminum strip blanks through condensation and crystallization rolling. machine provides raw materials. At present, the widely used twin-roll casting and rolling mill adopts a hydraulically pressed roll gap adjustment system. The principle of the hydraulically pressed system is as follows: figure 1 As shown, there is a depressing oil cylinder 9 on the transmission side and the operating side of the twin-roll casting and rolling mill. The oil in the rodless chamber of the depressing oil cylinder 9 comes from the high-pressure pump station, and the oil return fro...

AI Technical Summary

Problems solved by technology

Therefore, when the electromagnetic overflow valve 3 of the system fluctuates up and down the pressure of the system due to the wear of the cone valve, it will also cause the pressure fluctuations behind the one-way pressure reducing valve 8 valve.

Moreover, the wear of the pilot poppet valve and the valve seat of the pressure reducing valve will also cause internal leakage, which will also lead to fluctuations in the outlet pressure of the pressure reducing valve.

The fluctuation of the pressure will affect the longitudinal thickness deviation of the aluminum strip and the thickness deviation of the transverse direction, resulting in poor shape of the aluminum strip;

[0005] 2) There is back pressure in the leakage oil circuit, and the control oil circuit of the one-way pressure reducing valve 8 of the pressure reducing valve is the external leakage oil circuit, that is, after the control oil is pushed open the cone valve, it returns to the oil tank separately. If the back pressure changes, it will directly affect the pressure of the pressure oil that pushes the poppet valve, causing pressure changes, which will lead to changes in the working pressure of the pressure reducing valve.

In the one-way decompression valve 8, due to the oil leakage passage, after the oil pump 1 stops running, it cannot reach the pressure maintaining state, and the pressure drop is relatively fast, which requires the long-term operation of the oil pump 1, which increases energy consumption on the one hand. On the other hand, it also accelerates the wear of the hydraulic oil pump 1 and reduces the service life

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