Two-stage hydraulic control valve with controlled time of second stage slide valve switching over

FIELD: mechanics.

SUBSTANCE: hydraulic control valve is designed to control hydraulically operated assembly units of mobile machines. The two-stage hydraulic control valve with controlled time of the second stage slide valve switching over consists of the first stage hydraulic control valve with electromagnets and the second stage hydraulic control valve comprising a body with cast channels to connect the working hydraulic lines and control lines, a slide valve with return springs arranged on its ends, end face covers. In compliance with this invention, threaded throttle control elements interacting with spring-loaded check valves are arranged in the said end face covers, one in each cover.

EFFECT: simplification of design, higher reliability.

4 dwg

 

The invention relates to the field guides hydraulic vehicles with electro-hydraulic control with DN DN=10 (12) mm with mounting dimensions according to ISO 4401, in particular to the two-stage valves with time adjustment of the switching valve of the second stage.

Known two-stage valve with a nominal diameter of DN=10 type MCRN with time adjustment of the switching valve of the second cascade, made OJSC "KEMZ" gavrov.

The known range of two stage valves type F3-DG5V-5...2-... firm "Vickers" with time adjustment of the switching valve of the second cascade (1).

The known range of two stage valves type 4 WEN 10...S or S2 firm "Mannesmarin Rexroth" with time adjustment of the switching valve of the second stage (2).

As a prototype of the selected valve with electro-hydraulic control with DN DN=10 (16, 20, 32) mm RPG-10/3C with the limitation of time, made GSTB HA, Gomel. Hydraulic circuits and characteristics are listed in the directory of manufactured products 1998 (3).

Common deficiencies analogs and prototypes should include the fact that this standard design of two stage valves includes, as the finished structural member, hydrotussin with bratnimi valves 1, which is located between the valves 2 and 3 of the first and second stages (figure 1), which increases the pressure drop during the passage of the working fluid mass, dimensions and limits the scope of application of the valve. In addition, a significant drawback is that the contamination of the working fluid is possible jamming of the chokes in the case of hydratases.

The technical task of the invention is to simplify the design by reducing the element base, increase reliability, the expansion of applications for mobile machines, road construction equipment and utilities by reducing the mass-dimensional characteristics.

The technical result is achieved due to the fact that in the two-stage valve with time adjustment of the switching valve of the second cascade, consisting of a valve and the first stage with the electromagnet and the valve of the second cascade, which includes a housing with shed channels for connection working" hose and control lines, the valve return springs on the ends, end caps, according to the invention, the regulatory elements made in screw-in chokes that interacts with a spring-loaded check valves placed in the end covers, odnomu each of them.

Significant difference between the claimed invention is that it allows to exclude from the design of the two-stage valve and hydrotussin with check valves and implement its function by using the adjustable gidroksila and return valves located in the end plates of the valve of the second stage.

Figure 1 shows the typical design of valves-analogs and prototypes, General view.

Figure 2 presents the design of the valve prototype RPG-10/3C with time adjustment of the switching valve of the second stage by hidromassagem check valves, longitudinal section.

3 shows the inventive valve, longitudinal section.

Figure 4 shows the inventive valve, the option of throttling the flow of the working fluid at the exit end of the cavity of the valve of the second stage.

Valve prototype includes: valve and the first stage 1, performing the functions of pilot valve of the second cascade 2, cast iron housing 3 which is provided with channels to connect the main hose (P, T, a, b) and control lines (X, Y). Between the valves of the first and second cascade is hydrotussin 4 with 5 chokes (1) and 5 (2), which perform depending on healthy lifestyles is of the liquid flow functions choke or check valves. After you turn the valve 1 of the first stage working fluid through the orifice 5 (1) hydratases 4 and end cap 6 is supplied to the end surface of the spool 7 of the second cascade, under the pressure of the working fluid moves the valve in one extreme position, draining the working fluid from the other end cover 8 going through the throttle 5 (2) (as a check valve) hydratases 4. Throttling control flow at the inlet end of the cavity of the spool of the second cascade (adjusting the amount of fluid under the ends of the spool), and hence change the time of moving from one position to another is carried out by rotation of the flywheel 9 (1) and 9 (2) hydratases 4. The return valve of the second stage to the original position after deenergization of the electromagnet is provided by return springs 10 (1) and 10 (2).

When turning hydratases around the longitudinal axis 180° possible throttling of the flow of the working fluid at the exit end of the cavity of the valve of the second stage.

In the present valve includes: a valve 1 of the first cascade, which includes the electromagnets 2 and 3, the valve 4 of the second cascade, which includes a housing 5 with the shed channels, end caps 6 and 7, valve 8, the springs 9 and 10. In the end covers 6 and 7 are of resibo the e inductors 11 and 12, check valves 13 and 14 with the springs 15 and 16 and tubes 17 and 18, the spring rings 19 and 20, the tube 21 and 21

The valve regulating a switching time of the valve of the second cascade is as follows.

When applying voltage to the electromagnet 2 of the valve 1 of the first stage working fluid through the holes a, b, C and d, the threaded orifice 11 and the hole e gets into the end cavity f of the cover 6 and the end surface of the valve 8 valve 4 of the second stage. The spool 8, moving in the housing 5, compresses the spring 10, connects the corresponding cavity P, T, a, b and displaces the working fluid from the cavity h of the cover 7 through the check valve 14, compressing the spring 16. During the rotation of the screw throttle 11 having the hole for the Allen key is throttling flow, decrease or increase the quantity of working fluid and change the time of the movement of the spool 8.

The axial displacement of the screw throttle 11 is limited throttling edge of k and the spring ring 19.

When turning off the voltage to the solenoid 2 valve 1 of the first cascade of the slide valve 8 is returned to its original position under the action of the spring 10.

Similarly there is a change in travel time of the valve 6 when the electromagnet 3 of the valve 1 of the first cascade. The working fluid is here through the holes n, o, p and q, a threaded orifice 12 and the hole r falls within the socket cavity h of the cover 7 and the end surface of the valve 8 valve 4 of the second stage. The spool 8, moving in the housing 5, compresses the spring 9, connects the corresponding cavity P, T, a, b and displaces the working fluid from the cavity f of the cover 6 through the check valve 13, compressing the spring 15. During the rotation of the screw reactor 12 having a hole for the socket wrench, is throttling flow, decrease or increase the quantity of working fluid and change the time of the movement of the spool 8.

The axial displacement of the screw throttle 12 is limited throttling edge m and the spring ring 20.

When turning off the voltage to the solenoid 2 valve 1 of the first cascade of the slide valve 8 is returned to its original position under the action of the spring 9.

Option throttling the flow of the working fluid at the exit end of the cavity of the spool of the second cascade is depicted in figure 4.

Similarly implemented the ability to control the switching time of the valve of the second stage in a two-stage, two - and three-position valves with large nominal diameter and for different types of control.

Sources of information

1. "Hydraulic equipment. International directory", Vuksinick, Techinformi MAI, 2002 Book 2-I, RA the Affairs 5.

2. The company's catalog "Mannesmann Rexroth", "4/2 and 4/3-way Directional Valves Pilot Operated Type 4 WEN..." RE 24 751/03 .97.

3. "Directory of manufactured products", 1998, GSTB HA, Gomel.

Two-stage valve with time adjustment of the switching valve of the second cascade, consisting of a valve and the first stage with the electromagnet and the valve of the second cascade, which includes a housing with shed channels to connect the working hose and control lines, the valve return springs on the ends and end caps, wherein the regulatory elements made in screw-in chokes that interacts with a spring-loaded check valves placed in end caps, one in each of them.



 

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