SU909377A1 - Self-propelled agricultural machine hydraulic system - Google Patents

Description

(54) HYDRAULIC SYSTEM OF SELF-PROPELLED SELBIC ECONOMIC MACHINE

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The invention relates to mechanical engineering hydraulics. It can be used in self-propelled agricultural machines.

The hydraulic system of the self-propelled agricultural machine is known, containing a pump connected through a distributor to the hydraulic cylinders for lifting the working bodies and the copying wheels, ups of the automatic drive 1.

The disadvantage of the system is that when operating the machine, breakdowns of the working bodies are not excluded. So, if the operator made an erroneous switch-on, the machine began to move backwards, didn’t lift into the pre-working bodies and copy, yes, up, then breakdowns occur, because the working bodies and probes in contact with the soil are not able to move backwards

The purpose of the invention is to prevent breakdowns of the working bodies and probes when the machine is moving in reverse by eliminating the operator's safeguard actions.

This goal is achieved by the fact that the system is equipped with a locking servo-cylinder, the rod cavity of which is connected to the distributor section directly, and the piston through additional installed in parallel and oppositely directed check and reduction valves.

FIG. 1 shows the structural scheme of the self-propelled agricultural machine; in fig. 2 - its hydraulic system, scheme.

.Constructively self-propelled agricultural machine is a frame 1 with control 2 and running 3 wheels. On the frame 1 mounted automatic machine 4 driving with copy probes 5, working bodies 6 and hydraulic cylinders 7 and 8 lifting

15 last.

The hydraulic system includes a reversing drive for the chassis, containing a hydraulic motor 9, a hydraulic pump 10 and a hydraulic pump controlling the pedal 12 20 and turning on the reverse gear of the machine.

The pump (not shown in the drawing) is connected through the distributor 13 to the hydraulic cylinders 7 and 8 of the lifting of the working bodies 6 and the copy probes 5 of the automatic driving device.

The system also contains a locking servo-cylinder 14, the rod cavity 15 of which is connected to section 16 of the distributor 13 directly, and the piston cavity 17 through parallel and oppositely opposite return 18 and reducing 19 valves.

The hydraulic system of the self-propelled agricultural machine works as follows.

To bring the working bodies 6 and the copy probes 5 into the working position, oil is fed through the distributor 13 into the rod spaces (not indicated) of the hydraulic cylinders 7 and 8 of the lifting of the working bodies 6 and the copy probes 5, and through the check valve 18 into the piston cavity 17 of the blocking servo cylinder 14, the latter locks the pedal 12 to turn on the reverse of the machine. In order to carry out the reversing operation, the operator must raise the working elements of the b and copying probes 5. For this, oil is supplied through the distributor. 13 into the piston cavities of the hydraulic cylinders 7 and 8 of the lifting of the working bodies 6 and the copy probes of the rod cavity 15 of the locking servo cylinder 14. The latter unlocks the pedal 12 of the machine’s reverse only after lifting the working bodies 6 and the copy probes 5, since the reducing valve 19 is set to a pressure greater than pressure required to lift. So

Thus, the movement of the machine back is possible only after lifting the working bodies 6 and the copy probes 5.

The proposed system makes it possible to eliminate damages to the working bodies of the agricultural machine in case of erroneous actions of the operator.

Claims (1)

1. The machine is self-propelled COP 6. Instructions for use. Ternopil. Oblpoligraphizdat, 1979, p. 65, fig. 39 t 3 9 fuz.1