SU1495537A1 - Hydraulic control valve assembly - Google Patents

Abstract

The invention can be used in the hydraulic drives of tractor mounted implements. The purpose of the invention is to increase the reliability of the control unit by reducing the loss of the working fluid at the breaking of the hydrolines. In the cylindrical bores 7.8 of the housing 1 there is a spool 9 and an overflow valve 10 of indirect action. The valve control chamber 11 communicates through the throttle 12 with the pressure channel (K) 2, and the control valve K 4 - with the bore 7. The spring-loaded three-line two-way valve (GR) 13 with manual control and end chambers 14,15 of the hydraulic control is installed in K 2 before valve 10. K 2 to GR 13 through throttle 16 communicated with drain K 3. Camera 14 communicated with K 2 after GR 13, camera 15 — with K 3 in front of the throttle 16. Manual control of the GR 13 takes the form of a button 17 with a pusher 18, interacting with the end face of the spool of GR 13. 1 c.p. f-ly, 1 ill.

Description

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the spool 9 and the overflow valve 10 of the indirect action of the Cavity 11 of the control valve 10 are in communication through the throttle 12 with the nanorh channel (k) with 2, and the control K 4 with the bore 7, spring loaded three-way two-way valve (GR) 13 with manual control and end chambers 14, 15 hydraulic control devices 10

installed in K 2 in front of the valve 10. K 2 to GR 13 through throttle 16 communicated with drain K 3, Camera 14 communicated with K 2 after GR 13, camera 15 — with K 3 in front of the throttle 16, Manual control of the GR 13 is executed in the form of a button 17 with a pusher 18, interacting with the butt of the spool GR 13, 1. f-ly, 1 silt

The invention relates to agricultural engineering, namely to the hydraulic drive of mounted implements of tractors.

The purpose of the invention is to increase reliability by reducing the loss of the working fluid at the break of the hydronic line.

The drawing shows a structural diagram of the hydraulic distribution unit "

The hydraulic distribution unit includes a housing 1 with a pressure 2, a discharge 3, a control 4 and a working 5 and 6 channels, in the cylindrical bores 7 and 8 of which a spool 9 is placed and an overflow valve 10 of indirect action, the control cavity 11 of which is communicated through the throttle 1.2 s pressure channel 2, and control channel 4 - with boring 7 under spool 9, three-way two-way valve 13 with manual control and two end chambers 14 and 15 of hydraulic control, installed in pressure channel 2 before overflow yutan 10. Pressure channel 2 to the distributor 13 through the choke 16 is in communication with the drain channel. 3, the end chamber 14 communicates with the pressure channel 2 behind the distributor 13, and the end chamber 15 communicates with the drain channel 3 in front of the throttle 16o

Manual control of the distributor 13 is made in the form of a button 17 with a pusher 18 interacting with the end face of the distributor spool 13

The control unit works as follows

In the neutral position of the spool 9 when the working fluid is supplied to the pressure channel 2, the working channels 5 and 6 are closed, the control channel 4 is in communication with the drain channel 3, the distributor 13 is in the extreme upper position, the button 17 is extended out of the recess in the housing 1 o the throttle 16 enters the drain, creating in the end chamber 15 and the pressure channel 2 to the distributor 13 the pump idling pressure. When the button 17 is pressed, the pusher 18 moves the valve of the distributor 13 to the lowest position. pressure channel 2 behind the distributor 13 and creates pressure that holds the spool of the distributor 13 in the extreme rest position With a further increase in pressure in the pressure channel

2, the working fluid, the passage throttle 12 to the discharge through the control channel 4 and the drain channel 3, creates on it a pressure differential necessary to open the overflow valve

10. The pressure in the pressure channel 2 is determined by the setting of the overflow valve 10. When the spool 9 is switched to the working position, the overflow valve 10 closes and the working fluid flows through one of the working channels 5.6 into the cavity of the hydraulic actuator. The drowned button 17 indicates normal operation block distribution

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When hydraulic lines break, communicating the hydraulic motor with the hydraulic distribution unit, when the valve 9 is in one of the working positions, there is a sharp decrease in pressure in the pressure channel 2. When the pressure drops to a certain value, the pressure from the pressure on the end face of the distributor 13 is less

the force of the spring acting on the opposite end of the spool, and it occupies the uppermost position, separating the pressure channel 2 “The flow of working fluid into the gap stops 5

Claims (2)

In this case, Button 17 extends from recess JB of housing 1 and signals an emergency situation. Invention Formula 1o The hydraulic distribution unit, comprising a housing with a pressure, drain, control and working channels, in the cylindrical bores of which there is a spool and an overflow valve of indirect action, the control cavity of which is communicated through the throttle to the pressure channel, and the control channel with a bore under the spool, characterized in that, in order to ensure good reliability, it is equipped with a spring-loaded three 955376 a linear two-position hydraulic control valve 1 with two hydraulic control chambers installed in the pressure channel in front of the overflow valve, the pressure channel to the distributor communicating with the drain channel through the throttle, one end chamber communicating with the pressure channel behind the distributor, and the other end chamber - with a drain channel in front of the throttle. 2. Block by pl, which differs in that the manual control of the d-position distributor is made in the form of a button with a pusher interacting with the end of the spool of the hydraulic distributor.