Action sequence controllable four-port two-stage double-acting hydraulic cylinder

Abstract

The invention discloses an action sequence controllable four-port two-stage double-acting hydraulic cylinder. The hydraulic cylinder comprises a two-stage front cover, a two-stage piston, a two-stage piston rod, a two-stage cylinder barrel and four formed cavities; the hydraulic cylinder is characterized in that two one-stage limiting pistons (13) are arranged between a cylinder barrel component (11) and a one-stage piston rod (6), the cylinder barrel component (11) is provided with an oil inlet and outlet A, an oil inlet and outlet B, an oil inlet and outlet C and an oil inlet and outlet D, an oil inlet and outlet E is formed in the two-stage cylinder barrel (12), an oil inlet and outlet F is formed in the one-stage piston rod (6), an oil inlet and outlet G is formed in a one-stage piston (19), the oil inlet and outlet of the first cavity is the oil inlet and outlet A, the oil inlets and outlets of the second cavity are the oil inlet and outlet B and oil inlet and outlet G, the oil inlet and outlet of the third cavity is the oil inlet and outlet D, the oil inlets and outlets of the fourth cavity are the oil inlet and outlet C, the oil inlet and outlet E and the oil inlet and outlet F, two seal rings are arranged inside the one-stage piton (19), and one seal ring is arranged inside a two-stage piston (16). Accordingly, driving load weight polarization is achieved, the action sequence is reliable, stage chaos does not exist, a connecting pipeline does not move in a follow-up mode, the equipment manufacturing cost is reduced, and the hydraulic cylinder is safe and reliable.

Description

Technical field: [0001] The invention relates to a four-port two-stage double-acting hydraulic cylinder with controllable action sequence, in particular to a two-stage double-acting hydraulic cylinder whose connecting pipeline of the hydraulic cylinder does not move and stops at any time in a limited area, belonging to the technical field of hydraulic cylinders . Background technique: [0002] At present, in some working conditions, it is necessary to push the large load to the designated position first, and then push the small load to the designated position. When retracting, the small load retracts first, and then the large load retracts. There are generally two design schemes to complete this action, scheme one: use two hydraulic cylinders, one large hydraulic cylinder to push the large load, and a small hydraulic cylinder is connected to the large load, and the second stage is pushed out by the small hydraulic cylinder. Option 2: Use a conventional two-stage double-acti...

AI Technical Summary

Problems solved by technology

The above two solutions have some disadvantages and disadvantages. In the first solution, as the large load is stretched out, the small hydraulic cylinder will follow, which requires the connected hydraulic hose to follow along, which will not only cause cumbersome on-site vision but also reduce the service life of the hose. After a long time, the rubber hose will burst and cause unpredictable losses, and will increase the cost of equipment manufacturing

The action sequence of the conventional two-stage double-acting hydraulic cylinder used in Scheme 2 can be realized theoretically, but it is prone to random order phenomenon due to the influence of external factors such as load and friction, and the phenomenon of hose follow-up will also occur.

In addition, due to external influences and load changes, the hydraulic cylinder cannot reach the predetermined stroke, which will affect the control sequence of the next action of the hydraulic cylinder.

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