SU1528973A1 - Control valve unit of power mine support - Google Patents

Abstract

The invention allows to extend the functionality of a powered support device. The bore 2 of the housing 1 is communicated with channels with the 3, 4, 5, 6 lines, head, drain, control, actuator. An additional piston 9 is placed in the bore 8 of the piston 7. The spool 13 with the seal 14 is placed in the sleeve 11 and the spring-loaded sleeve 10 and communicates with one end with the piston 9. At the ends of the pistons 7 and 9, circular 16, 17 are used, which are in contact at the end of the piston stroke with an annular sealing element 12. The element 12 is placed on the end of the sleeve 11 on the side of the pistons 7, 9. The adjustable throttle is installed parallel to the hydroline 5. The width of the seal 14 on the pressure side is greater than the maximum distance between X 16 and the element 12. The spool 13 is in avnovesii if the force acting on the piston 9 from the hydraulic line 5, is counterbalanced by the force acting on the end of spool 13 by the spring force and the pressure head. 3 il.

Description

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The invention relates to the mining industry and can be used in the hydraulic drive of mechanized roof supports.

The purpose of the invention is to expand the functionality.

FIG. 1 shows a distribution device, a section; in fig. 2 is a basic hydraulic circuit of the device with a control signal from a separate power source; in fig. 3 - principle hydraulic circuit of the device with a control signal from the main hydraulic line of the head.

The device comprises a housing 1 with a bore 2, connected by channels with a hydraulic line 3 of a head, a hydraulic line 4 of a drain, a hydraulic line 5 of control, a hydraulic line 6 of an actuator, a piston 7 with a bore 8 in which an additional piston 9 is placed, a spring-loaded sleeve 10, a sleeve 11 with an annular seal - bearing element 12 and the spool 13 with a seal 14, placed in the sleeve II and the spring-loaded sleeve 10 and interacting at one end with an additional piston 9, adjustable throttle 15, installed parallel to the control line 5, at the ends of the main piston 7 and the additional piston 9, annular rims 16 and 17 are made in contact at the end of the stroke of the pistons with an annular sealing element 12 placed on the end of the sleeve 11 from the side of the pistons, and the width of the seal 14 of the spool 13 from the pressure side is greater than the maximum distance between the piston 7, which is circularly wired 16, and the sealing element 12.

The device works as follows.

In the initial position, in the absence of a hydraulic control signal in the hydraulic line of the control 5, the spool 13 under the action of the pressure of the pressure acting on its end is in the right extreme position (Fig. 1).

Piston 7 with ring bore 16 and additional piston 9 with ring bore 17 are located at a maximum distance X2 from sealing element 12, providing communication of the hydraulic line of actuator 6 with drain line 4.

With a gradual increase in pressure in the control line 5 by means of adjustable throttles 15 (Fig. 2), the piston 7, overcoming the distance, comes into contact with the sealing element 12 and isolates the hydrolysis of the actuator 6 from the drain line 4. Seal 14 of spool 13 partially enters

into the sleeve 10. With further pressure increase in the hydroline 5, the control continues to move to the left only the additional piston 9 and the visitor 13. At the moment the seal 14 of the spool 13 leaves the sleeve 11, the working fluid begins to flow from the hydraulic line 3 of the head to the hydroline 6, as well as through the annular gap between the sleeve 1 1 and the spool 13 will act on the end of the additional piston 9, shifting it to the right. Thus, the spool will be in equilibrium if the force acting on the additional piston 9 from the side of the hydraulic line 5 of the control is balanced by the force acting on the end of the spool 13 from the spring force and head pressure. In hydroline 6 of the actuating mechanism, the working fluid will be supplied under reduced pressure, depending on the pressure in the hydroline.

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Claims (1)

Invention Formula Mechanized roof support switchgear, comprising a housing with a bore, connected by channels with hydraulic lines, discharge, control and actuator, a piston with a bore, in which an additional piston is placed, a spring-loaded sleeve, a sleeve with an annular sealing element and a spool with a gasket placed in the sleeve and a spring-loaded sleeve and interacting at one end with an additional piston, and at the ends of the main and additional pistons are made annular end of the stroke of the pistons with the annular sealing member, Placing on sleeve end by the piston, characterized in that, in order to expand functionality by supplying the executive the pressure reduction mechanism, it is equipped with an adjustable throttle installed parallel to the control hydraulic lines, and the width of the spool seal on the pressure side is greater than the maximum distance between the main piston ring and the sealing element located on the side of the sleeve. Feed.g -} ( 18 FIG.