DE8204129U1 - Control valve - Google Patents

Description

Control valve

The invention relates to a control valve, in particular for controlling directional, reverse functions and the like of a Hydraulic cylinder of underground mining, with a housing that has at least one pump connection with a for Consumer leading channel as well as a return connection with a connecting to the channel leading to the consumer Having branch channel, wherein the channel and the branch channel with one actuatable from the outside of the housing Control element can be locked *

Such control valves are used to control hydraulic cylinders in underground mining, which
be used for pressing, straightening, backing or for other work »If a hydraulic cylinder is used for several functions or work, it may be necessary to supply it with pressure media of different pressures. For example, to run
the reverse function requires a pressurized medium under high pressure, while for pressure and straightening functions
Medium-pressure or low-pressure pressure medium is sufficient. Should the relevant work with
be carried out one and the same hydraulic cylinder, then this must be assigned at least two control valves, one of which is connected to a high pressure pump and the other to a medium pressure or low pressure pump. This is complex and cumbersome with regard to the actuation of the hydraulic cylinder. In particular, there is, however, the risk of operating errors or
Missing failures.

The object of the invention is therefore in the implementation of pressure, straightening, reverse or other functions with hydraulic cylinders in underground mining to avoid.

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This object is achieved in that the housing has two pump connections for high pressure and medium or low pressure has that each pump connection is assigned a lockable channel leading to the consumer and that a common return is provided.

In this control valve, two can be operated independently of one another and accordingly also independently of one another working valves housed in a common valve housing, but provided a common return is. The control valve is connected to both a high-pressure pump and a medium-pressure or Low pressure pump and on the other hand connected to the consumer. The interconnection within the valve housing is particularly easy if there is a lockable branch channel from each channel leading to the consumer to the common return leads.

A common actuating lever is provided as a control element to prevent incorrect operation or incorrect switching largely excludes, because only one lever has to be operated, which switches the control valve in each case so that the Hydraulic cylinder or another consumer either to the high pressure pump or to the medium pressure or low pressure pump connected. In particular, the housing can be designed so that it is on one or both sides, has a dead man's control.

In the following an embodiment shown in the drawing is shown the invention explained; show it:

Figure 1 is a schematic representation of a symbol for

a control valve with two pump connections and a common return, 35

Figure 2 in a schematic "representation partially one Section through a control valve according to Figure 1,

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Figure 3 shows the object of Figure 2 in a different functional position,

FIG. 4 shows the object according to FIG. 2 in a further functional position.

The control valve shown in the drawing has a valve housing 1 with a pump connection 2 for connection a high pressure pump, a pump connection 3 for connection to a medium or low pressure pump, a return connection 4 and two connections 5, 6 leading to a consumer. The consumer is in the present Case of a double-acting hydraulic cylinder 7, as used in underground mining. The two work rooms 8 and 9 of the hydraulic cylinder 7 are connected via associated lines 10, 11 to the respective connections 5, 6 of the valve housing 1 connected.

As can be seen from the drawing, a lockable channel 12 or 13 emanates from each pump connection 2 or 3, the channel 12 opening at connection 5 and the channel 13 opening at connection 6. The channels 12 and 13 can be shut off with valve bodies 15, each of which is assigned a valve seat 16.
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Viewed from the pump connections 2 and 3, the channels 12 and 13 respectively go behind their valve seats 16 lockable branch channels 17, 18 which open into the common return connection 4. The branch channels 17, 18 are closable with valve bodies 19, which valve seats 20 are assigned.

The adjusting movements of the valve bodies 15 and 19 on each side are functionally coupled to one another in such a way that the valve body 15 against its associated valve seat 16 is pressed while the valve body 19 is lifted from its associated valve seat 20, - and vice versa.

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A common one is used to operate the control valve Actuating lever 21, as shown in FIG.

The functional position shown in Figure 2 corresponds to the functional position shown in Figure 1 The valve body 15 of both channels 12 and 13, that is, the high pressure side and the medium or low pressure side are open their associated valve seats 16 pressed. The valve bodies 19 of the branch channels 17, 18 are assigned by their tO valve seats 20 lifted so that both working spaces 8, of the hydraulic cylinder 7 are connected to the return hose connection 4.

In the functional position shown in FIG. 3, the larger working space 8 of the hydraulic cylinder 7 is connected to the pump connection 2 for high pressure via the line 12 and the open valve 15, 16. At the same time the branch channel 17 opening into the channel 12 is blocked. The smaller working space 9 of the hydraulic cylinder 7 is ^{connected to the} return connection 4 with a connection.

In the functional position shown in Figure 4, the larger working space 8 of the hydraulic cylinder 7 is also connected to the return hose connection 4, while the smaller Working space 9 via the channel 13 and the now open valve 15, 16 with the pump connection 3 for medium or low pressure is connected.

In the case of embodiments not shown, instead of the actuating lever 21, a rotatable one can also be used for actuation Cam disc or a valve with a plunger may be provided. Each control valve is used to operate one Hydraulic cylinder. Operating errors are largely ruled out, since only one actuating element is provided at a time is. The control valve shown can also be produced more cost-effectively because there is only one valve housing with a return connection is required.

Claims (4)

• · Bt a ι 3 4300 Essen, February 12, 1982 PZ 3290 EB / bk THYSSEN INDUSTRIE AG At Thyssenhaus 1 4300 Essen 1 Protection claims Control valve, in particular for controlling rectification, reverse functions and the like of a hydraulic cylinder in underground mining, with a housing which has at least one pump connection with a channel leading to the consumer and a return connection with a branch channel adjoining the channel leading to the consumer, the channel and the branch duct with a control element which can be actuated from the outside of the housing can be shut off, characterized in that the housing (i) has two pump connections (2, 3) for high pressure and medium or low pressure, that each pump connection (2, 3 ) a lockable channel (12 or 13) leading to the consumer (7) is assigned and that a common return (4) is provided. tt · B
• II ■ 1 1 iiii η 2 - 2. Control valve according to claim 1, characterized in that of each channel leading to the consumer (7) (12 or 13) a lockable branch duct - (17 or 18) leads to the common return (4). 3, control valve according to one of claims 1 or 2, characterized characterized in that a common operating lever (21) is provided as the control element, 4. Control valve according to one of claims 1-3, characterized in that the housing (1) on one or both sides has a dead man's control.