Electrohydraulic
Control Systems
The hydraulic control units used worldwide are of rugged design and have been especially developed for the control of powered roof supports in underground mining operations. They can also be used in other areas of water hydraulics such as e.g. in rolling mills or as motor control units.
In order to be able to fulfill the most varied requirements of powered roof supports and meet the demands specified by customers in the best possible way the hydraulic control units can be combined choosing from a wide range of variants. In addition to the number of functions (up to 24) and the manifold port sizes for the hose lines valve capsules with different flow rates are available.
The pilot valves flanged to the control block are also available in different variants. For the electrical variant of the pilot valve approvals are available for the use in other countries such as e.g. USA, China, and Russia.
In order to be able to optimally perform certain functions of the shield support, as for example, controlling the flipper cylinder, the valve capsules can be equipped with a check valve.
The respective valve capsules have the check valve integrated between the working port and the return. It prevents that the flipper cylinder can extend all by itself due to an excessive backpressure which may e.g. occur when several shields are lowered at the same time.
The simple construction of the control units permits a fast and easy replacement of the components. The cartridge-style valve inserts, pilot valves and the integrated plug-type filter can be exchanged without problems.
In addition to the variants of the standard version many more options are possible by control block housings with different hole patterns. For example, two valve capsules can be activated via one pilot control valve. A further variant would be to supply selected valve capsules via an additional pressure connection with a different system pressure.
Electrohydraulic control systems are activated electronically via a shield control unit. We offer a variety of pilot valve designs for different applications. Approvals for different countries are available.
Extra high performance
For extreme seam thicknesses and thus large shield extensions, Tiefenbach has developed a control system that realizes the fastest transfer times even with large ram diameters and thus a lot of volume to be moved.
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High-flow
For larger thicknesses with a large volume, Tiefenbach has designed a solution that still offers maximum economy: Our proven 12 and 15 mm cartridges combined in one block. This saves costs in production and speaks for the high quality of this design. Up to 22 functions can be realized with this type of block.
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Low-flow
Tiefenbach also has the solution for planer struts or small thicknesses: lower flow with maximum cost efficiency.
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