SU1335142A1 - Tractor-mounted electric hydraulic system - Google Patents

Abstract

This invention relates to the field of agricultural construction. The purpose of the invention is to increase operational reliability. The tractor’s electro-hydraulic hitch system contains a hydraulic pump 1 communicated via servo gaiter 18 with hydraulic cylinder 19 and through the bypass valve 2 with solenoid valve (EC) 4 and one of the end cavities 15 of the additional servo-hammer 10. The other electric module is hydraulically connected to one of the cavities 23 of the hydraulic cylinder 19 and through a controlled check valve 7 with a drain line, with another end cavity 11 of an additional servosolotok 10 and with a control cavity 13 of a controlled check valve 7. Gidsel

Description

The system is equipped with an OR 9 valve, which is hydraulically connected to the line connecting the bypass valve 2c EK 4, and to the line telling the other EK 6 to one of the cavities 23 of the hydraulic cylinder 19. When fixing the mounted implement 21 in the lift

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FIELD OF THE INVENTION The invention relates to agricultural machinery, in particular to electro-hydraulic systems of tractor hinge.

The purpose of the invention is to increase operational reliability.

The drawing shows the electrohydrodynamic tractor hitch system.

The tractor's electrohydraulic suspension system contains a hydraulic pump 1 with an overflow valve 2, the cavity 3 of which is connected to the drain line through an electromagnetic valve 4 with an electromagnet 5, another electromagnetic valve 6 for servo-controlling a controlled non-return valve 7 equipped with an electromagnet 8, an OR 9 valve , a spring-loaded additional servosolator 10, the end cavity 11 of which, on the side of the spring 12, communicates with the control cavity 13 of the controlled check valve 7 and with the interatal cavity 14 of the valve and 6, and opposite to cavity 15, with a valve 3, a relief valve, 2, spring-loaded on both sides by springs 16 and 17, a servo-piston 18, a hydraulic cylinder 19, the rod 20 of which is kinematically connected to the mounted tool 21, and a check valve 22, hydraulically connected with the servosolbert 18 and the cylinder 23 lifting the cylinder 19. The cavity 3 of the relief valve 2 and the cylinder 23 lifting the cylinder 19 are connected through the valve OR 9 with the valve 24 of the solenoid valve 6. The end cavities 25 and 26 on the side of the springs 16 and 17 of the servo oil hammer and 18 are communicated via an additional servosolotnik 10 with a closed cavity 3 of the relief valve 2 and with a drain. Electromagnets 5 and 8 sub-pressure from the cavity 23 of the hydraulic cylinder 19 through the valve OR 9, the valve 6 is supplied to the end cavity 11 of the servo-piston 10, which is displaced towards the cavity 15, while the servo-collector 18 is held in the middle position. 1 il.

Power supplies (not shown) with the ability to turn on simultaneously. The valve cavity 3 of the overflow valve 2 communicates with the drain line through the safety valve 27. Servo protector body 28

18 there are grooves 29-32, which are hydraulically connected to the hydraulic pump 1, the lifting cavity 23, the lowering cavity 33, respectively.

19i with a drain line. In the housing 34 of the servo gaiter 10, grooves 35 and 36 are provided, which are communicated respectively with cavities 25 and 26.

Electro-hydraulic system hitch of the tractor works as follows.

In order to move the rod 20 of the hydraulic cylinder 19 in the direction of the lift, the electromagnet 5 is turned on, while the valve 4 disconnects the valve cavity 3 from the drain. The bypass valve 2 closes and disconnects the hydraulic pump 1 from the drain. The pressure created by the flow of working fluid in the closed cavity 3 presses the valve OR 9, which separates the cavity 3 from the cavity 23 of the hydraulic cylinder 19 and communicates the cavity 3 to the cavity 24. The valve 6 is pressed in the direction of the electromagnet 8 and the flow of working fluid from the cavity 3 enters the end cavity 11 of the servo-hammer 10 and the cavity 13 of the valve 7. A part of the flow enters the cavity 15 of the servo-hammer 10. Due to the fact that the pressures of the working fluid in the cavities 11 and 15 are the same, the servo-hammer 10 is pressed by the spring 12 towards the cavity 15, at the same time but the flow of the working fluid supplied from the cavity 15 through the bore 36 in an end cavity 26 of servo spool 18. The opposite chamber 25 through the

31335142

The hatch 25 is communicated with the drain magpoo to the bc at

strait. The servo gate 18 moves to the left (according to the drawing), together the grooves 29 and 30. The valve 7 separates the cavity 23 from the drain. The flow of working fluid through the check valve 22 enters the cavity 23 of the lifting of the hydrocylster 19, has carried out the lifting of the gun 21.

Fixing the mounted implement 21 in a predetermined position is carried out while simultaneously de-energizing the electromagnets 5 and 8. When the electromagnet 5 is de-energized, valve 4 communicates cavity 3 of the relief valve 2 with a drain, while the relief valve 2 opens and reports the hydraulic pump 1 with a drain.

The valve OR 9 under the action of pressure created by the weight of the mounted gun 21 in the cavity 23 of the hydraulic cylinder 19 communicates the cavity 24 with the cavity 23. The pressure created by the weight of the mounted tool 21 presses the valve 6 with the electromagnet 8 de-energized and returns to the servo valve 10 and the cavity 13 of the valve 7, which separates the cavity 23 from the drain. The check valve 22 also closes. The servo-cartridge moves toward the cavity 15, which is hydraulically connected to the drain. The cavities 25 and 26 of the servomotor 18 are in communication with the drain and the latter is installed in the middle position by the action of the spring 16 and 17. The cavity 33 of the lowering of the hydraulic cylinder 19 is in communication with the drain, while the groove 29 is disconnected from the groove 30, which is connected with the cavity 23 of the hydraulic cylinder 19.

The attachment of a mounted gun under its own weight occurs when the electromagnet 8 is turned on. At that, valve 6 communicates cavities 13 and 11 with a drain and disconnects them from cavity 24, which is under the pressure of working fluid created by the weight of the mounted gun 21 valve 7 opens, together with the cavity, 23 lifting the hydraulic cylinder 19 with the drain.

VNIIPI Order 3988/1 Circulation 627 Subscription Proizv.-poly. pr-tie, Uzhgorod, st. Project, 4

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The forced lowering of the tool 21 under the action of the pressure of the working fluid generated by the hydraulic pump 1 is performed while the electromagnets 5 and 8 are simultaneously turned on. At that, valve 4 disconnects the cavity 3 of the relief valve 2 from the drain, valve 2 closes and disconnects the hydraulic pump 1 from the drain. Valve 6 communicates cavities 13 and 11 with a drain. The pressure of the working fluid flow is transmitted to the cavity 15 of the servo-hammer 10, the latter moving in the direction of the cavity 11, which communicates with the drain. The flow of working fluid from the hydraulic pump 1 through the cavity 3 and the groove 34 enters the cavity 25, while the cavity 26 through the groove 36 communicates with the drain. The servo gate 18 moves toward the groove 26, compressing the spring 17. The groove 31 communicates with the groove 29 and is disconnected from the drain. The flow of the working fluid from the hydraulic pump 1 flows through the grooves 29 and 31 into the cavity 33 of the lowering of the hydraulic cylinder 19. The working fluid from the lifting cavity 23 through the valve 7 is forced out to drain.

Claims (1)

Invention Formula Electro-hydraulic system of the tractor hitch, containing a hydraulic pump, communicated via a Servo-Column with a hydraulic cylinder and through an overflow valve with a solenoid valve and one of the end cavities of an additional servo-piston, and another electromagnetic valve, hydraulically connected to one of the cavities of the hydraulic cylinder and through a controlled non-return valve with a drain line, with a different end cavity, of an additional servo-holders and with a control cavity of a controlled check valve, characterized in that To improve operational reliability, it is equipped with an OR valve, which is hydraulically connected to the line connecting the bypass valve to the solenoid valve, and to the line connecting the other solenoid valve to one of the cavities of the hydraulic cylinder.