SU426055A1 - ZOLOTNIKOVY GIDRODISTRIBUTOR - Google Patents

Description

one

Known valve for control systems of actuators of road machines according to ed. St. No. 268822, containing interconnected pressure, discharge and working sections, in which the latter are separated by an intermediate section with a check valve.

In these control valves, additional working sections are needed to increase the flow rate of the working fluid, which leads to the complexity of the system.

The proposed device differs from the known fact that in the intermediate section of the hydraulic distributor there is a channel connecting the overflow chamber of this section with an additional power source of the working fluid.

This provides increased reliability and simplified system by reducing the number of working sections.

FIG. 1 and 2 shows the proposed valve.

Pump 1 supplies the flow rate of the working fluid to the hydraulic distributor 2. This valve controls, for example, the mechanisms of the stroke, the rotation of the platform and the arm, and, when its spools are in neutral, directs the flow of the working fluid through the pipeline 3 to the intermediate section of the hydraulic distributor 4 fed from the pump 5. The hydraulic distributor 4 consists of the pressure section 6, the working sections 7, 8 and 9, the intermediate section 10 installed between the working sections 7 and 8, as well as the drain section 11. In the intermediate section 10 the reported with overflow chamber A of the hydraulic distributor channel B with an external feed. To channel B through pipeline 3

A hydraulic system supplied by pump 1 is connected through an external supply. A check valve 12 is located in the housing of the drain section 11. The proposed hydraulic distributor operates as follows. The working fluid from the pump 5 is fed into the hole C of the pressure section 6, and the working fluid from the pump 1 through line 3 to the channel B of the intermediate section 10. At neutral

The position of the spools of the working sections 7, 8 and 9 (as indicated in Fig. 2) the flow of working fluid from the pump 5 from the hole B through the overflow channels D and D of the working section 7 is directed to the chamber A of the intermediate section, where it is added to the flow of the working fluid from the pump 1 and then through the overflow channels G and D of the working sections 8 and 9, the drain section 11 and the opening E are discharged into the tank. At the same time, pressure lines Zh are blocked

and taps to the working bodies of the I and K are locked.

The first possible switching case is the neutral position of the spools of the working sections 8 and 9 and the switched on position of the spool of the working section 7 (down position). When this working fluid from the pump 5 from the hole goes to the pressure line 3 and then through the cavity And to the executive body, for example the motor stroke, and from there through the cavity K and the drain line of the working section 7, channel L intermediate section and drain line the working sections 8 and 9 is directed to the drain section I, and further through the hole E is discharged into the tank. When the spool of the working section 7 is turned on (upward), the flow of working fluid from pump b, brought to the hole C of the pressure section 6, is directed to the pressure line and then through the cavity K to the actuator, and from there through the cavity I and the drain line of the working section 7, the channel of the intermediate section, the drain lines of the working sections 9 and 8 are directed to the drain section 11 and further through the opening E is discharged into the tank. At the same time, the liquid entering through the pipeline 3 from the pump 1 through the external supply and channel B into the overflow chamber A is directed through the channels D and D of the working sections 9 and 8 to the drain

section 11 and further through the hole E is discharged into the tank.

The second possible case of switching on is the neutral position of the spool of the working section 7 and the on position of, for example, the spool of the working section 8. In this case, the included spool of the working section 8 blocks the flow valve of the hydraulic distributor and the flow of working fluid from the pump 1

summed in the overflow chamber A with the flow of the working fluid from the pump 5.

Thus, a total flow is supplied to the pressure line G of the working section 8 through the channels H and L and the check valve 12

working fluid from two sources.

Subject invention

The spool valve in the control system of the executive mechanisms of road machines according to ed. St. No. 268822, characterized in that, in order to simplify the system and increase its usefulness,

the intermediate section of the hydraulic distributor is provided with a channel connecting the overflow chamber of this section with an additional power source with the working fluid.

FIG. one