SU1530130A1 - Hydraulic system for grain combine harvester - Google Patents

Abstract

The invention relates to mechanical engineering and is intended for use in combine harvesters. The purpose of the invention is to reduce hydraulic losses due to a decrease in the operating pressure in the drain line. The hydraulic system contains injection 3, drain lines 15, overflow valve 6, plunger hydraulic cylinder 11 connected by hydrolines to pump 2 and tank 1 through distributor 5 containing three-position spool 7 connected to each other with groove 14 made on A shut-off, hydraulically controlled shut-off device including a shut-off valve and a piston to control it. New is that the sealing of the spool juice is cylindrical, and the drain cavity of the controlled piston in the neutral position of the spool is communicated with the drain line through the groove. 2 Il.

Description

FIG. 2

The invention relates to mechanical engineering and is intended for use in combine harvesters.

The aim of the invention is to reduce hydraulic hygroes by reducing the operating pressure in the drain line.

FIG. 1 is a schematic diagram of the hydraulic system; in fig. 2 - structural scheme of the distributor.

The hydraulic system contains a tank 1, a pump 2, in the discharge line 3 of which a safety valve 4 is connected in parallel and a valve 5 in series, including a relief valve G, a three-position spool 7 and a hydraulically controlled locking device 8, including uiee along) 1 pin 9 and spring-loaded vane valve 10 connected to the plunger hydraulic cylinder 11 by hydraulic line 12. At the same time, in the neutral position of the spool 7, the cavity 13 of the hydraulically controlled locking device 8 is on the side of the vane valve K) and the spring 9, through valve 14 of the spool 7, the distributor 5, the hydroline (drain line) 15 and the filter 16 is connected to the tank 1, and the cavity 17 on the other side of the porn 9 is locked. An overflow valve 6 is connected to the slide valve 7 by means of the 18 and 19 lines, respectively, of control and injection, and to the tank 1, via the hydraulic line 15 and the filter 16.

The system works as follows.

In the neutral mode, the working fluid from the tank I is pumped by pump 2 via the discharge valve. RCI 3 to the distributor 5, flows to the overflow valve 6 and then part of it via the control line 18 through the spool 7 in the neutral position, the drain line 15 and the filter 16 freely It is drained into tank 1. Overflow the 1st valve 6 opens and the main flow of the working fluid from the pump 2 flows through the drain line 15 through the filter 16 into the tank 1. When removing the spool 7 from the neutral position, for example, to the position “Locking device open to discharge working fluid drain The bays from the control line 18 of the overflow valve 6 to the tank 1 are blocked by the shut-off valve 7 and the overflow valve. 1apan 6 turns off the drain of the working fluid to the tank 1 through the drain line 15 and filter 16. The working fluid iodine pressure but the discharge line m 3 and 19 through the valve 7 into the cavity 13 to the hydraulic control valve 8, moves 9 and, lifting the spring-loaded check valve 10 from the initial position, is fed along line 12 to the plunger hydraulic cylinder 11. The hydraulic system operates in the operating mode. In this position of the spool 7, the cavity 17 of the locking device 8 through the spool 7, distribute. 5, sshvny line 15 and

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the filter 16 is connected to the tank 1. When the plunger hydraulic cylinder 11 is fully ejected, the safety valve 4 is activated and the valve 7 is brought into the neutral position, the working fluid is drained through the control line 18 of the overflow valve 6 into the tank 1 and the hydraulic system operates in neutral mode.

When installing the plunger cylinder 11 to the initial position, the valve 7 is briefly displayed in the position of the locking device open to the drain. The working fluid is drained from the control valve 18 of the overflow valve 6 into the tank 1 is closed by the shut-off valve 7 and the overflow valve 6 turns off the drain of the working fluid to the tank 1 through the drain line 15 and the filter 16. The working fluid under pressure passes through the discharge lines 3 and 19 the spool 7 to the hydraulically controlled shut-off device 8, into the cavity 17, moves 9, which, by lifting the spring-loaded shut-off valve, connects the plunger hydraulic cylinder 11 through line 12, the spool 7, the distributor 5, the drain line 15, the filter 16 to the tank 1. e in line 12 drops sharply and the spool 7 is discharged in a neutral position. The hydraulic system starts to work in neutral mode, and the piston 9 is in the upper position, the 4U score is open. 1 cavity from 17

tank 1 in the neutral position of the spool 7, and keeps the spring-loaded shut-off valve 10 in the open position. Thus, the plunger hydraulic cylinder 11 continues to automatically return to its original position, while the hydraulic piston. I at this moment is operating in neutral mode.

If it is necessary to install the plunger hydraulic cylinder 11 in an intermediate position and securely fix it, the valve 7 is briefly introduced into the position "The locking device is open for discharge, the working valve from the control line 18 and the overflow valve 6 is blocked by the locking valve 7 and the overflow valve 6 turns off the working fluid to the tank 1 through the drain line 15 and the filter 16. The working fluid under pressure on the discharge lines m 3 and 19 flows through the spool 7 into the cavity 13 of the hydraulically controlled shut-off The device 8 moves the piston 9 downwards and enters the line 12. 11Rememb1 The plunger cylinder 11 stops the initial position, the valve 7 is brought to the neutral position. The cavity 13 through the groove 14 of the spool 7, the distributor 5, the drain line 15 and the filter 16 is connected to the tank 1, the shut-off valve 10 is returned to its original position by the spring force and reliably disconnects the hydraulic cylinder 11 and the line 12 from the tank 1.

Claims (1)

Invention Formula The hydraulic system of the combine harvester, containing injection, drain lines, overflow valve, plunger hydraulic cylinder, is connected by hydrolines to the pump and tank through a switchgear containing one-way and interconnected three-position spool with a groove, made on a shut-in, hydraulically controlled shut-off device, including a shut-off valve and valve for controlling it, characterized in that, in order to reduce the power harvester’s hydraulic system consumed by reducing the working pressure in the pressure line when the plunger hydraulic cylinder returns to the initial position, which seals the juice of one of the cavities of the controlled piston, is cylindrical, and the other drain cavity of the controlled piston on the valve side in the neutral zone the decomposition valve communicated with the drain line through the bore. . /