SU1491352A1 - Arrangement for revolving the shaft of rotary plough - Google Patents

Abstract

The invention relates to hydraulic actuators of agricultural machinery, namely reversible plows, and can be used in agricultural engineering. The purpose of the invention is to simplify the design of the device and reduce its material consumption. The device for rotation of the shaft of the reversible plow contains a lever rigidly connected to the shaft, a piston hydraulic cylinder 3, an injection and drain lines 4 and 5, a spring-loaded spool 6 and a throttle with the pressure valve 7 in the main 8 between the spring-loaded cavity 9 of the spool 6 and the rod cavity 10 of the hydraulic cylinder 3. New is the fact that in line 12 between the free cavity 13 of the valve 6 and the rod cavity 10 of the hydraulic cylinder 3 an additional throttle with a check valve 11 is placed. In so doing, said line 12 is connected to the control line 8 audio the stem cavity of the hydraulic cylinder 10 between the main flow control valve 7 and the stem cavity 10. A feature of the device is that at the moment of passage of the shaft reversible plow "dead position" of the hydraulic cylinder piston 3 starts vydvigats accumulated due to the kinetic energy of the rotating masses. At the same time from the rod end 10 to the injection line 4 enters the flow of fluid. Due to this, a negative pressure drop occurs at the throttle with the check valve 7, switching the valve 6, which reverses the fluid flow. A throttle with a check valve 11 in the free cavity 13 of the spool 6 provides the necessary time to delay the return of the control valve. 3 il.

Description

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The invention relates to hydraulic actuators of agricultural machinery, namely reversible nlugov, and can be used in agricultural engineering.

and, the spruce of the invention is to simplify the design of the device and reduce its material consumption, as well as increase reliability.

On fis. I presents the constructive scheme of the reversible plow; in fig. 2 - hydraulic circuit; in fig. 3 - dependence of pressure change at the throttle.

The device for rotation of the circulating shaft H. iyra contains lever 2 rigidly connected to shaft 1, 11or1pnevoy hydraulic cylinder 3, discharge and drain hydraulic lines 4 and 5, spring-loaded spool 6 and throttle with non-return valve 7 in hydroline 8 between spring-loaded cavity 9 of spool 6 and rod stock 10 hydraulic cylinders 3. The device is also equipped with an additional choke with a return valve II placed in the hydroline 12 between the free section of the 13 of the spool 6 and the rod end of 10 of the hydraulic cylinder 3, the specified hydraulic line 12 is connected ezhdu main throttle with reverse Clan prefecture nolostyu 7 and rod 10.

R | - pressure in front of the throttle with check valve 7; P - after him.

The device for turning the shaft of the reversible plow works in the following way.

When the working fluid is supplied to the spool 6 by the tractor hydraulic distributor (not shown), it passes freely through the throttle with the check valve 7 into the rod position 10 of the hydraulic cylinder 3, HOpHjeHb begins to move to the right and turns through the lever 2 the shaft 1 of the operating gear. The spool b is held both by the spring bi spring and by the positive pressure difference across the throttle with a check valve 7, which is supplied to the cavity of the spool 6. The positive difference on the throttle with the reverse valve 7 is explained by graphs FIG. 3, where | on stock harvesting.

The piston of the hydraulic cylinder 3 reaches the final right-hand position, which corresponds to the rotation of the shaft 1 of the revolving plow by 90, and due to the accumulated kinetic energy of the rotating masses, the force starts to move to the left, and the passage of the hydraulic cylinder 3 moves to the left. from the rod bottom, it begins to flow into the discharge line 4 through a throttle with a check valve 7, which, in this case, will ensure throttling of the working fluid and will result in a negative pressure drop ( with the previous direction of flow of the working fluid, when this pressure drop.

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ny) i.e. if initially, when the piston moved to the right, the pressure at the inlet to the throttle was greater than at its output (entrance to the rod cavity), then now, when the piston moves to the left, the pressure at the outlet of the rod end 10 of the hydraulic cylinder 3 is greater, than at the entrance to the throttle 7, as illustrated in FIG. 3, whence it is seen that on ethane the extension of the rod.

The resulting negative pressure drop across the throttle 7 will begin to act on the spool 6 and switch it to the left, since a lower pressure acts on the spring-loaded cavity 9 of the spool 6, and a greater pressure of the rod cavity 10 acts in the free cavity 13 through the open throttle 11.

Thus, the switching of the spool 6 takes place and the direction of the flow of liquid is reversed.

From the discharge line 4, the liquid begins to flow into the piston cavity of the hydraulic cylinder 3, and from the rod end 10, the fluid through the choke 7 will flow into the drain line 5. The spool 6 continues to be held in the switched position by maintaining an appropriate pressure differential across the choke 7 and applying more pressure to right cavity 13 of spool 6. After the piston reaches the leftmost position, the flow of fluid through the throttle 7 stops, the pressure drop across it becomes zero.

The spring of spool 6 will begin to return it to the right position, while the liquid will begin to flow through the throttle 11 from the right cavity of the spool, slowing down the process of switching (returning) the spool 6 to its original position. At the same time, pressure will rise in the delivery line 4 and the automatic return valve of the tractor hydraulic distributor will automatically switch to the neutral - locked position.

By selecting the resistance of the throttles 11, the return time of the spool 6 to the initial position can be provided longer than the response time of the automatic return valve of the tractor hydraulic distributor.

At the same time, it is necessary to note that the switching time of the spool 6 in. The time of passing the dead position by the axis of the revolving plow is much shorter than the time of pressure rise in the discharge line 4 until the automatic return is activated, so that the automatic return doesn’t hesitate to work and the rotation is ensured shaft 1 reversible plow. After the piston of the cylinder 3 stops in the leftmost position and the automatic return valve of the tractor hydraulic distributor actuates, the spring of the spool 6 will move it to the initial position, and the cycle

turning shaft 1 reversible plow can be repeated.

In this way, the direction of movement of the revolving plow is automatically switched.

Claims (1)

Invention Formula A device for rotation of the shaft of the reversible plow, which contains a lever rigidly connected to the shaft, a hydraulic cylinder, an injection and discharge hydraulic lines. spring-loaded spool and choke with a check valve in the hydroline between the spring-loaded cavity of the spool and the cylinder cavity of the hydraulic cylinder, characterized in that, in order to simplify the design and reduce material consumption, the device is equipped with an additional choke with a non-return valve placed in the hydraulic line between the free cavity of the valve and a hydraulic cylinder cavity, wherein said hydrolini is connected between a main choke with a check valve and a rod cavity. Yu Cleaning w / a / a Fig.Z VA // 7 C w / f / fa