DE8810491U1 - Hydraulic valve - Google Patents

Description

Hydraulic valve

The invention relates to a hydraulic valve according to the features in the preamble of claim 1.

Such a hydraulic valve is used, for example, in a hydraulic anchor drilling column, which is used to drill holes in the rock in underground mining. These holes can then be used, among other things, to fix rock anchors or to take rock samples or to detect harmful gases. Such holes are also used to insert explosive cartridges or to insert shock impregnation devices.

By turning the handle relative to the valve housing, a consumer connection can be connected to the pressure line supplying the hydraulic fluid and thus the hydraulic fluid can be supplied to at least one hydraulic consumer, while the other consumer connection, to which at least one hydraulic consumer can also be connected, is connected to the return line that discharges the hydraulic fluid.

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If the handle is turned in the other direction, the consumer connections are first separated from the pressure line connection and the return connection. When turned further in the other direction, the pressure line is then connected to the consumer connection previously connected to the return line, while the consumer connection previously connected to the pressure line is now connected to the return line.

The end positions of the handle are maintained, if necessary by means of appropriate locking devices, until the neutral middle position or the other operating position is set by deliberately turning the handle back.

Especially in the case of the previously explained anchor drilling columns, the hydraulic valves in question form part of handles, which are exposed to constantly changing tensile and compressive forces from the miners during practical use. It is necessary to move the hydraulic valves to the middle position in order to avoid initiating or carrying out undesirable work processes. To do this, the miner must adjust the hydraulic valves in a targeted manner. This is often associated with difficulties.

The invention is based on the object of improving the hydraulic valve described in the preamble of claim 1 in such a way that a return of the hydraulic valve to the middle position is basically guaranteed if the miner does not consciously maintain either one or the other band position.

According to the invention, this problem is solved by the features listed in the characterizing part of claim 1.

The handle is still connected to the control element in a rotational manner. When the handle is rotated into one or the other end operating position, in which either one of the consumer connections is connected to the pressure line and the other consumer connection is connected to the return line in parallel, the spring-elastic return element is tensioned. If the handle is released, the return force of the return element built up by the tensioning causes the handle to be automatically moved to the neutral middle position, in which there is no connection between the consumer connections and the pressure line or the return line.

This automatic shifting of the handle to the middle position is particularly advantageous for anchor drilling columns with hydraulic motors and hydraulic cylinders in which the hydraulic valves are installed at the ends of a handle that can be grasped on both sides. Here the miner now has the option of manually exerting pressure and tension forces during the rotating operations.

A preferred embodiment of the spring-elastic return element forms a helical torsion spring according to the features of claim 2. Such a helical torsion spring is easy to manufacture and can be installed in a space-saving manner.

The assignment of the helical torsion spring to the valve housing on the one hand and to the handle on the other hand is advantageously carried out with the features of claim 3. Here, a comparatively slight relative rotation of the handle to the valve housing is sufficient to tension the helical torsion spring and thus build up the restoring force. Due to this fact, this is also guaranteed.

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that the handle is returned to the middle position from any relative position rotated from the middle position.

The stops for the radially directed ends of the helical torsion spring can be implemented in a variety of ways. However, a preferred embodiment consists of the features of claim 4. Such stop bolts are not only easy to manufacture, but can also be easily fixed in corresponding recesses in the valve housing and the handle. Fixing can be done by pressing in, welding in or gluing in.

A practical mounting of the helical torsion spring and the stop bolt is characterized in the features of claim 5. The recess is formed by the axially parallel inner socket of the handle, which serves to attach the handle to an axle stub of the control element, as well as by the sleeve-like casing of the handle. This casing also overlaps a cylindrical length section of the valve housing with comparatively little play and thus prevents particles from entering the recess that accommodates the helical torsion spring.

The curved recess provided in the rotationally fixed disc according to claim 6 has the task of limiting the end positions of the hydraulic valve, i.e. the positions in which one of the consumer connections is connected to the pressure line and the other consumer connection is connected to the return line.

The invention is explained in more ^detail below with reference to an embodiment shown in the drawing.

Figure 1 shows a hydraulic valve in a schematic vertical longitudinal section;

Figure 2 shows a cross section through the hydraulic valve of Figure 1 along the line H-II and

Figure 3 shows a cross section through the hydraulic valve of Figure 1 along the line HI-III.

Kit 1 in Figure 1 is a hydraulic valve, such as is installed at the ends of a handle that can be grasped on both sides and is part of a hydraulic anchor drilling column used in underground mining. The hydraulic consumers of such an anchor drilling column are, for example, a hydraulic motor and a hydraulic cylinder.

The valve housing 2, which has a rectangular outer contour, has a control element 4 inside that can be rotated about the axis 3, otherwise not shown in detail. By appropriately moving the control element 4, a connection P for a hydraulic pressure line can be connected either to the connection V for one hydraulic consumer or to the connection Vl for the other hydraulic consumer. The hydraulic consumer not connected to the pressure line connection P is then connected to the connection V or Vl for the return line in this position of the control element 4.

The control element 4 is led out of the valve housing 2 by a stepped pin S. The larger diameter length section 6 of the pin S is sealed against the valve housing 2 by means of a seal.

A disk 9 is pushed onto the collar section 8 of the pin 5 up to the shoulder 10 on the pin length section 6 and is fixed in place against rotation by means of a key 11 (see also Figure 2).

Furthermore, an axially parallel inner socket 12 of a sleeve-like handle 13 is pushed onto the pin end section 8 with essentially no play. The handle 13 is secured using a screw 14, which passes through a hole in the handle base 15 in the axis 3 and is screwed into a threaded hole (not shown in detail) in the pin end section 8. By securing the handle 13, the disk 9 is also secured to the pin 5. The key 11 also serves to secure the handle 13 to the pin end 8 in a rotationally fixed manner.

The inner connection piece 12 is wrapped around by the windings 16 of a helical torsion spring 17 (see also Figure 3). The ends 18, 19 of the helical torsion spring 17 are angled parallel to one another in the radial direction and extend next to two stop bolts 20, 21 fastened on the one hand in the valve housing 2 and on the other hand in the handle 13. The stop bolts 20, 21 run parallel one above the other and parallel to the axis of rotation 3 of the handle 13. The length of the stop bolts 20, 21 is dimensioned such that both ends 18, 19 of the helical torsion spring 17 come into the area of influence of the stop bolts 20, 21.

The stop bolt 20 fixed in the valve housing 2 also passes through a curved recess 22 in the disk 9. The axis 23 of the curved recess 22 extends in a circle around the axis of rotation 3 of the handle 13.

It can also be seen that the handle 13 with its casing 24 tightly covers a cylindrical inner section 25 of the valve housing 2, so that the penetration of dust and other dirt particles into the recess 26 between the inner connection piece 12 and the casing 24 is prevented.

If the handle 13 is turned to establish a connection between the pressure connection P and one of the consumer connections V or Vl, the helical torsion spring 17 is simultaneously tensioned, since on the one hand the stop bolt 21 takes the end 18 or 19 of the helical torsion spring 17 with it, while the other end 19 or 18 remains fixed by the stop bolt 20 fixed in the valve housing 2. The handle 13 can be turned until the stop bolt 20 comes to rest on the end of the recess 22.

If the miner lets go of the handle 13 in this operating position, the restoring force created by the rotation of the helical torsion spring 17 automatically generates a restoring moment, which results in the handle 13 being moved back to the neutral center position of the control element 4, as shown in Figures 1 to 3.

The situation described above applies to both directions of handle 13.

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1 - Hydraulic cylinder

2 - Valve housing

3 - Rotation axis

4 - Control organ

5 - Tenon

6 - Longitudinal section v.

7 - Seal

8 - section v. 5

9 - Disc

10 - Paragraph 5

11 - Barrel spring

12 - Inner socket of 13

13 - Handle

14 - Screw

15 - Handle base

16 - Hindoungen v. 17

17 - Coil torsion spring

18 - end of *7

19 - end of 17

20 - Stop bolt

21 - Stop bolt

22 - Recess in 9

23 - Axle of 22

24 - Coat of 13

25 - Volume section 2

26 - Bin rotation

P - pressure connection R - connection for return V - Consumer connection VI - Consumer approval

Claims (6)

Your sign .:. ..PAT^cfT-ss/flwÄ^Te.,· STUHLMANN - WILLERT - OIDTMANN BOCKERMANN 144/33456 4 J.··/ JJ«aO PATENT ATTORNEYS DR.-INS. W. STUHLMANN t DIPU-INa. R. WlLLERT t OR.-ING. P. H. OIDTMANN DIPL.-ING. R. BOCKEFMANN EUROPEAN PATENT ATTORNEYS Bergstrasse 1S9
PO Box 1&Ogr;24 5&Ogr;
463Ω BOCHUM 1 18.08.1988 XR/Mon Patent claims : 1. Hydraulic valve, the valve housing of which has a connection for the hydraulic pressure line, a connection for the return line and two separate connections for hydraulic * consumers, and in which a rotatable control element connected to a handle is provided in the valve housing, via which the consumer connections can be alternately connected to the connections for the pressure line and the return line, characterized in that the valve housing (2) and the handle (13) are connected to one another by a spring-elastic return element (17) in a way that allows limited relative rotation. 2. Hydraulic valve according to claim 1, characterized in that the spring-elastic return element (17) is formed by a helical torsion spring. 3. Hydraulic valve according to claim 2, characterized in that the helical torsion spring (17) wraps around an axially parallel inner section (12) of the handle (13) with at least one turn (16) and see IWefon (02 34) &bgr; 19 β?/ββ/βθ · iWa» ((te &THgr;4) j3i|oe|ii··· T«*jx 8f>6 361 ewop d ■ Telegr. Stuhlmann patent cemmefibenk AQ., Boohum. No. 3 &THgr;&THgr;4 7&bgr;& ■ •poeinffoftbnto'eee'en /4*47-431 · Please specify file number and date with the ends (18, 19) angled parallel to one another in the radial direction, next to two stops (20, 21) fastened on the one hand in the valve housing (2) and on the other hand in the handle (13). 4. Hydraulic valve according to claim 3, characterized in that the stops (20, 21) are formed by bolts arranged parallel one above the other and parallel to the axis of rotation (3) of the handle (3). 5. Hydraulic valve according to at least one of the ans^nrüshe 3 * Λ or 4, characterized in that the helical torsion spring (17) and the stop bolts (20, 21) are embedded in a recess (26) of the handle (13). 6. Hydraulic valve according to at least one of claims 1 to 5, characterized in that a disk (9) is clamped in a rotationally fixed manner between the handle (13) and the control element (4), in which a curved recess (22) is provided through which the stop (20) fastened to the valve housing (2) can move relatively. ti tt #··*♦( I
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