SU446692A1 - Power cylinder - Google Patents

Description

one

The invention relates to the field of machine building, in particular to power cylinders with piston fixation in an intermediate position,

Known power cylinders comprising a liner, a piston rod and end caps, in which the piston rod is fixed in the extreme positions by means of a servo drive.

A disadvantage of the known devices is the impossibility of fixing the piston rod in an intermediate position.

In order to provide the possibility of full and incomplete piston travel to a fixed position, the servo is made in the form of an additional cylinder fixed to the cylinder body, covering the piston rod, fixed in the middle part of the hollow rod, acting on the split ring mounted in the servo housing bore on the rod DOWN. Cylinder made groove,

which MOBILE axially mounted a second ring with an outer diameter slightly i smaller than the inner diameter | split ring, entered during fixation in the interval between the second; eye ring and servo housing.

Ka figure 1 shows the power cylinder with fully released

0 stock; Fig, 2 - the same, with the stock, fixed in the intermediate -. Mr. position .:

The proposed power cylinder consists of a sleeve I, in which;

five

rod 2 moves with the piston. Single rod travel 2 limited with one | side cover 3, and on the other cover. The direction of movement of the rod is determined by the flow of the working fluid into the fittings 5a and 56. The part of the stem 2 leaving the cover 4- of the sleeve 2 is provided with a ring b, which can be displaced in the axial direction by the value L. With a sleeve articulated power spacer 7, which is mounted retractable

emphasis in the form of a radially deformable elastic split ring 8, which in the free state is centered on the outer diameter of the notch 9 in the spacer 7 coaxially with the rod 2, the value of the inner diameter of the ring 8 is somewhat larger than the outer diameter of the ring b

A servo cylinder with a hollow rod 10 located concentrically with a power rod 2 is mounted on the spacer 7. The position of the hollow rod 10 is determined by the direction of supply of the working fluid to the socket II of the servo cylinder. The hollow rod has a recess 12 according to the diameter of the ring 8 in the deformed state. The recess is made with lead-in chamfer. The internal diameter of the ring 8 in the deformed state is less than the external diameter of the second ring 6,

The device works as follows.

When the cylinder is operated for a full stroke of the rod 2 without limitation in an intermediate position, pressure is pre-supplied to the fitting II of the servo cylinder. The hollow rod 10 (see Fig. 1) moves to the extreme left position, the ring 8 freely and ensures unhindered passage of the ring 6. By applying pressure to the choke, the direction of movement of the rod 2, which can move from one stop to the other, is determined.

If it is necessary to release the rod 2 to an intermediate position (see Fig. 2), the pressure is preliminarily supplied to the fitting -12 of the servo cylinder. The hollow rod 10 shifts to the extreme right position and compresses the ring 8, which slides over the lead in the outer diameter into the recess 12. In this case, the inner diameter of the ring B decreases and the ring 8 serves as a stop for ring 6 (no matter with which ring b is suitable for the deformed ring 8). In this case, the pressure applied to the cylinder connection 5a leads to a limited release of the rod 2, since ring 6 abuts against ring 8.

If in this position file

the pressure in the fitting 11 of the servo cylinder by connecting the fitting 12 to the drain, uo the hollow rod 10, moving to the left, will release the ring 8, which having unclenched, will miss the ring 6, and the rod 2 will advance to full speed. If it is necessary to partially remove the rod 2 from the fully released position, the stop ring 8 is first pushed by applying pressure to the fitting 12 of the servo cylinder, and then pressure is fed to the fitting 56.

If the ring 6 is stationary, then the intermediate position of the rod 2 will be different when approaching the stop from the fully retracted and fully released position due to the width of the rings 8 and 6,

To eliminate this effect, the ring 6 is made movable by an amount c, equal to the sum of the axial dimensions of the rings 6 and 8.

SUBJECT OF INVENTION

Claims (2)

1. A power cylinder with a piston rod fixed in an intermediate position by means of a hydropneumatic hydraulic actuator, so that, in order to ensure the possibility of carrying out a full and incomplete piston stroke to a fixed position, the servo actuator is designed as mounted on the housing a power cylinder, an additional cylinder, an OHHRT rod with a piston fixed in the middle part of the hollow rod, acting on a split ring mounted in the bore of the servo drive, and on the shaft of the power cylinder a bore in which an axially movable second set a ring with an outer diameter slightly smaller than the inner diameter of the split ring, which is inserted during fixation into the gap between the second ring and the servo housing. 2. A cylinder according to claim I, characterized in that the groove on the piston rod of the power cylinder exceeds the axial size of the second rings by an amount not smaller than the width of the split ring. needles 2.