SU680674A1 - Hydraulic drive for working implements - Google Patents

Description

(54) HYDRAULIC WIRELESS OF WORKING BODIES

influence of the misalignment of the valve body and the pusher.

This is achieved by TCVI. what is in T (g: k; gg1mr

a cone shaped 1taz is made, in which the mouth: oilen cone-shaped with spherical "} th lateral surface) is an element having grooves that form throttling holes with the end of the valve body.

FIG. 1 is a circuit diagram of a drive in a neutral position; in fig. 2 - the same, when draining the working fluid from the piston cavity of the hydraulic cylinder; in fig. 3 - a pusher of a seat of the locking valve and an intermediate element in neutral. position (enlarged. scale); in fig. 4 - by reduction of the same elements and discharge of the working fluid from the piston cavity of the hydraulic cylinder (increased scale); in fig. 5 - that / ke. when discharging the working fluid on the piston cavity of the hydrocyliidra in the event of a misalignment of the position of the pusher with the seat of the stop valve.

The hydraulic actuator for controlling the working bodies of the agricultural machinery, in particular, the speed variator of the combine harvester, contains a pressure source 1, an actuator hydro-amp, etc. 2 connected to a pressure source through a spool 3, an overflow 4 and two shut-off valves 5, 6.

The executive hydraulic cylinder 2 is two-sided, mounted on the frame 7 of the vehicle, and its rod 8 (with access to one side) is connected to the moving unit 9 pulleys of the cliineremental variator 10. The spool 3 is three-position, its rod 11 is installed in one common case 12 s overflow 4 and zapori.mi 5 and 6 valves.

The shut-off valves 5, 6 are located coaxially and on the sides of the pusher 13.

The overflow valve 4 with the throttle hole 14 is spring-loaded spring 15.

Each of the locking K, naHaf-iOB 5.6 s; 1jit ijiapviK 1B, 17 set by B, sa 8, 19.

Between tormsm lujpnyca of the priorel k.laia iio 5 {ce: lo; 18) and the pusher 13 is installed intermediate ;; th element 20 with Iaza 21 (Fig. 3).

In the neutral position h (). Lotn11 3 (Fig. 1) is held by spring 22. On the stem 1 1 of the valve, four annular grooves 23-25 are formed, forming five annular projections 27--31.

The golden case 3 in its longitudinal bore has six annular protrusions 32-37 formed by annular cavities 38-42.

The cavities of the shut-off valves 5, 6 on the side of the balls 16, 17 are connected with the cavities of the hydraulic motor 2 with channels 43, 44 by pipelines. 45, 46, and the cavities of the shut-off valves from the side of the pushers with channels 47 and 48 with circular nozzles 39, 41 , 38, 42 and further channels 49, 50 with hydraulic cylinder 51, which has a pipeline 52. Overflow

valve 4 has cavities 53, 54, 55 and channel 56.

The drive works as follows.

In the absence of a manual or automatic machine (., Acting on the spool 3, the centering spring 22 (as shown in FIG. 1)

keeps it in neutral.

Due to this arrangement of the spool 3, the flow of the working fluid from the pressure source through the pipeline 52 enters the cavity 53 of the overflow valve 4, after which part of the flow of the working fluid passes through the throttle 14, the cavity 54 and then the channels 49, 50 to the hydraulic tank 51.

Pressure differential across choke 14 overflow valve 4 blows, overcoming the force of spring 15, lifts and the main flow of working fluid from cavity 53 flows into cavity 55 and further along channel 50 also flows into hydraulic tank 51.

If necessary, change the positivity of the movable unit 9 of the clinorev.menor variator 10, for example, turn it against

clockwise, the spool 3 does not mix down to the position shown in FIG. 2

In this position of the spool 3, the curvature 41 communicates with the annular cavity 40, and the channel 49 is cut off by the annular protrusion 27 of the spool.

As a result, the flow overflow valve 4; downwards, closing the liquid passage to the drain, and the flow of working fluid from the pressure source 1 through pipe 52, channels 56 and 48, enters the pre-valve cavity of the lower shut-off valve 6, lifts 17 and further along the pipeline 45 enters the rod end of the hydraulic cylinder 2, turning the block 9 anti-clockwise. O. of war with these. U "

the current of the liquid working fluid, acting on the pusher 13, exerts pressure on it and, with its conical part, closes the intermediate spherical element. 20 with the saddle, 8, forming the choke 21, through which the working

the fluid from the piston section of the hydraulic cylinder 2, the pipeline 46, the reciprocating and non-valve valve cavities of the locking clanap 5, the channels 47, 49, 50, the annular points 38 and 39 enters the hydraulic tank 51.

The parameters of the choke switches 21 are selected from the descriptions of lowering the variator block 9 within 3-4 seconds.

In the case of misalignment of the holes in which is located; The pusher 13 (Fig. 5) and the cross: 1 locking valve 5 is agitated; the intermediate spherical element 20 is installed in its conical socket so that its flat part with the throttle groove 21 fits snugly to the end face of the saddle 18

element 5, which increases the stability of the flow of the working fluid through the choke.

Claims (2)

Invention Formula The hydraulic drive of the working bodies, which includes a double-acting hydraulic cylinder, the cavities of which co-communicate with the operated spool through two shut-off valves, alternately put into operation by a coaxially arranged pusher, characterized in that stability of the flow by eliminating the misalignment of the valve body and the pusher; in the latter, there is a tapered groove in which a cone-shaped element with a spherical side surface is installed, having grooves that form the throttling holes with the valve body end. Sources of information taken into account in the examination 1 Portnov MN Allowance combiner. - M., Kolos, 1972, p. 148, 161, fig. 95 and 105. 2. USSR author's certificate number 475970, cl. A 01 B 63/10, 1973. Ф1.-г.2