Three-port two-stage double-action hydraulic cylinder with controllable motion sequence

Abstract

The invention discloses a three-port two-stage double-action hydraulic cylinder with a controllable motion sequence. The three-port two-stage double-action hydraulic cylinder with the controllable motion sequence comprises two stages of front covers, two stages of pistons, two stages of piston rods, two stages of cylinder barrels and four cavities formed through the front covers, the pistons, the piston rods and the cylinder barrels, and is characterized in that a first-stage limiting piston (13) is arranged between a cylinder barrel component (11) and a first-stage piston rod (6), wherein oil in-and-out holes, namely A, B and C, are formed in the cylinder barrel component (11), and an oil in-and-out hole, D, is formed in the second-stage cylinder barrel (12); the first-stage piston rod (6) is provided with an oil in-and-out hole, E, and an oil in-and-out hole, F, is formed in the first-stage piston (19); the oil in-and-out hole, A, is for the first cavity, and the oil in-and-out holes, B and F, are for the second cavity; the oil in-and-out hole, C, is for the third cavity, and the oil in-and-out holes, C, D and E, are for the fourth cavity; wherein the third cavity is communicated with the fourth cavity, and two seal rings are arranged in the first-stage piston (19) while one seal ring is arranged in the second-stage piston (16). According to the three-port two-stage double-action hydraulic cylinder with the controllable motion sequence, two-stage distribution of the load weight can be promoted and achieved, the motion sequence is reliable, and no disorder is in stages while no free movement of pipeline connection exists; in addition, the manufacturing cost of equipment is saved, and therefore the three-port two-stage double-action hydraulic cylinder with the controllable motion sequence is safe and reliable.

Description

Technical field: [0001] The invention relates to a three-oil port two-stage double-acting hydraulic cylinder with controllable action sequences, 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 within 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, followed by the large load. There are generally two design schemes to complete this action requirement. Scheme 1: use two hydraulic cylinders, one large hydraulic cylinder pushes a large load, and a small hydraulic cylinder is connected to the large load, and the small hydraulic cylinder realizes the second-stage push. Option 2: Use a conventional two-stage dou...

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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