Measuring and testing – Surface and cutting edge testing
Patent
1986-08-06
1987-11-10
Noland, Tom
Measuring and testing
Surface and cutting edge testing
7386254, 7386206, G01L 500, G01N 358
Patent
active
047048956
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for monitoring the cutting or wart rollers, in particular of roadheading machines in mining and tunnel construction, by determining the loads occurring at the individual rollers. The invention also relates to a device for carrying out the method with measuring points which are equipped with strain gauges and an evaluating unit.
Part-face and full-face heading machines which are used in underground mining and tunnel construction and equipped with roller drilling tools comprise a drill head which works the entire face in the heading and detaches the solid mineral. This extraction work is done with the aid of cutting or wart rollers which are arranged at the rotating front disc of the drill head or the hood-shaped drill head. The cutting and wart rollers fragmentate the rock by high pressure and for this purpose the roadheading machine is braced against the sidewalls with prop claws or supported correspondingly on the floor. To determine the load distribution across the drill head region of these heading machines the loads occurring at the individual roller drilling tools are measured by means of strain gauges. These measurements at the bearing pedestals however do not provide full information because they do not permit any assessment of the rotational running condition of the roller drilling tools. The monitoring of the proper rotational condition of the roller drilling tools, which permits conclusions to be drawn on the wear behavior and on sparking possibly caused by stationary rollers, must therefore be carried out in parallel. For this purpose an additional measuring point is employed which by means of a so-called cam pulse indicates each revolution of the cutting roller. A disadvantage in the known method and also of the known device for carrying out the known method is that separate measurements must be made, that separate measuring points are necessary, and that roller rotation stoppage is possibly measured and reported only after a delay.
The problem underlying the invention is to make it possible to measure in combination and accurately the loading and the rotational behavior of the roller drilling tools of a heading machine or the like and to provide a device suitable for this purpose.
SUMMARY OF THE INVENTION
The problem underlying the invention is solved in that tangential expansions are measured at the races of rolling bearings supporting the roller drilling tools.
By the method according to the invention it is surprisingly possible for each roller drilling tool to simultaneously reliably monitor, by means of a single signal, both the load applied to and the rotational behavior of, the roller drilling tool. The appearance of the signal itself indicates that no stoppage of the rotation of the associated tool has occurred, while the absolute magnitude of the signal is an indication of the magnitude of the load applied to its tool. The values determined in this manner are substantially more accurate and simpler to transfer than those in the already known methods. As a result, a quicker and more reliable reaction to the operational behavior is possible. In regard to the device, the problem is solved in that the measuring point is arranged in one of the races of the measuring bearing and is formed as a strain gauge. This solution is advantageous because the arrangement is then of simple construction since only one measuring point need be provided and observed for each tool. It permits the monitoring of all the necessary functions and obtains the corresponding information.
The aimed for strain gauge measuring point introduced to a bearing makes it possible to determine reliably and simply, during a cutting operation, simultaneously, the necessary exact information on the magnitude of the loading of and on the rotational movement or standstill of the associated roller drilling tool. The characteristics of the measuring signal depend on the change of voltages due to the rolling of the bearing elements over the measuring point. Thus, an os
REFERENCES:
patent: 4112751 (1978-09-01), Grunbaum
patent: 4118933 (1978-10-01), Coleman et al.
patent: 4203319 (1980-05-01), Lechler
Boing Rolf
Frase Dietmar
Noeske Manfred
Bergwerksverband GmbH
Noland Tom
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