Mechanical locking hydraulic cylinder and control method thereof

Abstract

The invention relates to a mechanical locking hydraulic cylinder and a control method thereof. The mechanical locking hydraulic cylinder comprises a cylinder barrel and a piston, wherein the piston isarranged in an accommodating cavity of the cylinder barrel for dividing the accommodating cavity of the cylinder barrel into a rod cavity and a rodless cavity; the piston is at least in partial interference fit to the cylinder barrel; and oil which enters the rod cavity penetrates into a gap formed by the peripheral surface of the piston and the side wall of the accommodating cavity of the cylinder barrel to expand the cylinder barrel. According to the mechanical locking hydraulic cylinder and the control method thereof disclosed by the invention, oil is punched into the rodless cavity, so that the oil enters the gap between the piston and the cylinder barrel to expand the cylinder barrel, and therefore, a mechanical locking function on any position is realized in cases of not having a special unlocking loop, not additionally arranging hydraulic cylinder parts, not increasing structure complexity, and not occupying interior space of the piston rod, and a common hydraulic cylinder canbe directly replaced.

Description

technical field [0001] The invention belongs to the field of hydraulic mechanical equipment, in particular to a mechanical locking hydraulic cylinder and a control method thereof. Background technique [0002] The statements in this section merely provide background technical information related to the disclosure of the present invention, and do not necessarily constitute prior art. [0003] Hydraulic linear actuators-hydraulic cylinders are widely used in construction machinery, agricultural machinery, industry, national defense and military fields to provide linear drive functions. After the hydraulic cylinder moves to the specified position, the position maintaining accuracy is an important indicator of the performance of the hydraulic cylinder product. At present, most of the hydraulic systems realize the maintenance of the moving position by closing the hydraulic cylinder drive oil circuit through valves such as hydraulic locks, balance valves or reversing valves. Usi...

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Problems solved by technology

Using this method has the following disadvantages: 1. Hydraulic locks, balance valves or reversing valves all have varying degrees of leakage, and it is impossible to maintain the long-term position of the hydraulic cylinder; 2. These valves may be stuck. 3. The liquid enclosed in the load chamber of the hydraulic cylinder will also shrink and expand when the ambient temperature changes, resulting in slight changes in the position of the hydraulic cylinder

Secondly, it is necessary to add a piston, unlocking oil pipe, locking sleeve, unlocking oil port and other parts in the hydraulic cylinder, which increases the complexity and cost of the hydraulic cylinder; thirdly, it needs to occupy the internal space of the piston rod of the hydraulic cylinder, which is generally used for The built-in magnetostrictive displacement sensor adds difficulties to the built-in sensor of the hydraulic cylinder. For the transformation application, it is impossible to directly replace the ordinary hydraulic cylinder.

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