SU499214A1 - Hydraulic cylinder - Google Patents

Description

(54) HYDRAULIC CYLINDER

one

The invention can be applied as a lifting means, a locking mechanism or a shutter in various lifting devices, vessels and pipelines.

Known hydraulic cylinders, comprising a housing, a fixed rod inside it and a hollow plunger fitted with retaining elements.

However, such cylinders do not provide rigid fixation of the piston in any of its positions.

To ensure rigid fixation of the piston in any position in the proposed cylinder, the upper part of the fixed rod is made in the form of a cone, and in the lower part of the core there is a conical bore with radially placed fixing elements in it, and the angle between the conical boreholes and the rod is less than the sliding friction angle .

The drawing shows the described hydraulic cylinder, a general view.

In the housing 1 is placed a piston 2 and a fixed central rod 3 with a conical side surface. Conical bore is made in the bottom 2 in the lower part, and the angle between the cone forming the bores and the rod is smaller than the friction sliding angle. Inside the piston there is a hollow plunger 4, the movement of which is limited by a nut 5. In the side wall of the plunger there are radial holes in which are placed

the locking elements 6, and in the upper part is mounted a check valve 7.

There are three working cavities in the hydraulic cylinder: direct pressure A, counter pressure B, and cavity C in the cavity. The cavity B through the longitudinal opening in the wall of the ground can communicate with the cavity C by means of a check valve 7, and at the extreme lower position of the plunger 4, through the annular bore D in the stem.

For the operation of the hydraulic cylinder, cavity A is supplied under pressure from the working medium — liquid or air.

Porschen 2 and plunger 4 begin to rise, with the fluid or air from

the cavity B through the porthole and the check valve 7 is forced into the cavity B and from there to the drain in the oil system tank or released into the atmosphere. The locking elements 6, carried away by the plunger 4, constantly choose the gap between the conical surface of the piston 2 and the rod 3.

When the pressure in cavity A drops, the weight of the lifted load (or pressing force) is transmitted through the cone surface of the piston.

on the locking elements, which, interacting with the conical surface of the rod 3, keep the piston from lowering. If it is necessary to continue the ascent, the working fluid or air is supplied to the cavity A.

When the piston is lowered, the working medium is fed into the cavity B. The plunger 4 under the action of the pressure of the medium moves relative to the piston 2 downwards and pushes the locking elements 6 out of the gap. When the plunger is moved to the lowest position, the working medium from the cavity C retreats into the upper cavity B of the hydraulic cylinder and the piston begins to descend.

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Claims (1)

Invention Formula A hydraulic cylinder comprising a housing placed inside it fixed rod and hollow plunger equipped with locking elements, characterized in that, in order to ensure rigid fixation of the piston in any of its position, the upper part of the fixed rod is made in the form of a cone, and in the lower part of the piston there is a cone boring with radially placed fixing elements in it , with the angle between the cone forming the bore and the rod is less than the angle of friction sliding.