Movable support rotary hydraulic control loop of winding machine

Abstract

The invention discloses a movable support rotary hydraulic control loop of a winding machine. The loop comprises a three-position four-way reversing valve, two balance valves and a two-position four-way reversing valve. The three-position four-way reversing valve is respectively connected with inlet ends of a liquid inlet pipeline, a liquid return pipeline, a first balance valve and a second balance valve. The three-position four-way reversing valve is positioned on a Y-shaped middle position machine when being in middle position. A control end of the first balance valve is connected with an inlet end of the second balance valve through a one-way throttling valve; and a control end of the second balance valve is connected with an inlet end of the first balance valve through a one-way throttling valve. The first balance valve and the second balance valve are respectively connected with two cavities of a rotary hydraulic cylinder. The two-position four-way reversing valve is respectively connected with control ends of the liquid inlet pipeline, the liquid return pipeline, the first balance valve and the second balance valve. The loop can prevent the unstable condition of a rotating arm due to the gravity center change in movable support rotation, reduces radial external force suffered by the rotating arm in transverse moving actions, reduces the winding drum perforation difficulty, and prolongs the winding drum life.

Description

technical field [0001] The invention relates to the field of hydraulic system control of large-scale steel rolling equipment, in particular to a coiler movable support rotation hydraulic control circuit. Background technique [0002] The coiler is one of the important equipments on the hot-rolled strip steel production line. The coiler is mainly composed of a reel, a movable support, a coiler, and a coil unloading trolley. Among them, the movable support device of the coiler changes the cantilever state of the reel, changes the reel from one point support to two point support, and improves the stability of the reel under force during work. Active support devices currently in use, such as Figure 2 to Figure 7 As shown, it is mainly composed of a fixed bracket 1, a rotating arm 2, a traversing base 3, a rotating hydraulic cylinder 4, a traversing hydraulic cylinder 5, and a proximity switch 6. [0003] The movable support device has two actions of closing and opening. When t...

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Problems solved by technology

[0004] There are two problems in the hydraulic control circuit of the movable supporting device of the existing above-mentioned structural form, one: when the rotating arm 2 rotates from the open state to the closed state, its center of gravity is changed from the right side of the rotating shaft 203 to the left side of the rotating shaft 203, Due to the transformation of the center of gravity, the rotating arm 2 drives the rotating hydraulic cylinder 4 to generate an instantaneous pulling force, resulting in unbalanced force and causing the entire rotating mechanism to be in a state of instantaneous instability.

Similarly, when the rotating arm 2 rotates from the closed state to the open state, its center of gravity is transformed from the left side of the rotating shaft 203 to the right side of the rotating shaft 203. Due to the transformation of the center of gravity, the rotating arm 2 drives the rotating hydraulic cylinder 4 to generate instantaneous pulling force, which will also cause The force is unbalanced, and the entire rotating mechanism is in a state of instant instability

Second: when the movable support moves laterally, the connecting shaft 201 of the rotating arm 2 and the fixed bracket is inserted into the connecting hole 102 of the fixed bracket and the rotating arm, and the reel of the coiler is inserted into the connecting hole 202 of the rotating arm and the reel, and two places The matching gap is small and the perforation accuracy is high. At this time, the rodless cavity of the rotary hydraulic cylinder 4 is in a high-pressure state. When the rotary arm 2 moves laterally, it will receive radial external force from the hydraulic cylinder, making it more difficult to traverse the perforation. The radial force at the time will also have a certain impact on the reel

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