Abstract: A hydraulic control valve, a dual-cylinder extension system and an aerial work engineering machine. The control valve comprises a flow distributing and collecting valve, and control valve body is provided with a first oil opening, a second oil opening and a third oil opening. A first oil opening, a second oil opening and a third oil opening of said flow distributing and collecting valve are respectively communicated with the first oil opening, the second oil opening and the third oil opening of the valve body. The control valve has two working states, wherein, in the first working state, the oil path between the second oil opening and the third oil opening of the valve body is blocked; and in the second working state, the oil path between the second oil opening and the third oil opening of the valve body is opened.

Abstract: A hydraulic control valve, a dual-cylinder extension system and an aerial work engineering machine. The control valve comprises a flow distributing and collecting valve, and control valve body is provided with a first oil opening, a second oil opening and a third oil opening. A first oil opening, a second oil opening and a third oil opening of said flow distributing and collecting valve are respectively communicated with the first oil opening, the second oil opening and the third oil opening of the valve body. The control valve has two working states, wherein, in the first working state, the oil path between the second oil opening and the third oil opening of the valve body is blocked; and in the second working state, the oil path between the second oil opening and the third oil opening of the valve body is opened.

Abstract: An accumulation device for paper-like sheets comprises a conveying part, a clamping part, a guiding part and an accumulating part, which are connected serially. The conveying part is used for conveying the paper-like sheet to the clamping part. The clamping part comprises a drive shaft and multiple banknote-stacking wheels fixed to the drive shaft, and every banknote-stacking wheel is provided with multiple wheel blades having the same curvature. The paper-like sheet can be clamped between any two adjacent wheel blades and rotatably conveyed to the guiding part. The guiding part receives the paper-like sheet conveyed by the clamping part and guides the paper-like sheet to the accumulating part. The accumulating part is used for accumulating the paper-like sheet conveyed by the guide part. The paper-like sheets are reliably collected among the wheel blades and prevented from scattering, and thus the paper-like sheets can be uniformly arranged in order and stacked on the accumulating part.