Hydraulic array for roller mills

Abstract

The invention relates to a hydraulic array for roller mills, having a spring unit (11) for each grinding roll, a gas/oil reservoir (16, 17) and hydraulic supply systems for changing the operation states of the spring units or grinding rolls. In order to ensure an almost constant crushing power and a uniform contact pressure of the grinding rolls and at the same time reduce the production and assembly costs and the risk of failure of the components of the hydraulic system and to improve the exchange of components or the entire system, each spring unit of a grinding roll is associated, in its proximity, with its proper hydraulic supply unit (20) as a compact hydraulic system and a reservoir station (22) so that the necessary connections can be realized by means of relatively short conduits (23) and high-pressure lines (24). Every hydraulic supply unit can be pre-assembled under dust-free ambient conditions and accommodated for example in a hydraulic cabinet (25) and only needs to be connected on site.

Description

technical field [0001] The invention relates to a hydraulic system arrangement for a roller mill according to the preamble of claim 1 . Background technique [0002] The invention is used in roller mills in which the milled material is milled between grinding discs or circulating horizontal grinding belts of grinding discs and stationary rolling grinding rollers, and the roller mill Overflow mills that are configured to drop the milled ground material down from the edge of the grinding disc or the edge of the grinding disc or are configured to convey the ground material along the air or gas flow in an integrated sieve Air roller mill machine for crushing mills. [0003] It is particularly advantageous that the invention is suitable for large roller mills, for example large roller mills with a grinding disc diameter of 2 m and more and with three, four or six grinding rollers. For example, roller mills are known having a grinding disc diameter of 4.1 and 4.3 m, on which fou...

AI Technical Summary

Problems solved by technology

[0010] Disadvantages of the known systems with hydraulic cabinets for the individual roller pairs are that the costs for producing and assembling the pipes, especially for the laying of the pipes, are too high, the components of the hydraulic system due to contamination that cannot be completely avoided under field assembly conditions Whereas the risk of accidental damage is relatively high and the possibility of repair and replacement of the hydraulic system or individual components is relatively low in the event of damage

However, for the general function "increased operating pressure", a larger pump power is disadvantageous, since too much oil is already delivered to the system during a brief switch-on of the larger pump, resulting in a rapid increase in pressure, This elevated pressure then exceeds the standard value and leads to a command to re-enable the "operating pressure drop" in the hydraulic system

Therefore there is often hysteresis in this conversion process

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