Process and device for determining the condition of machines with several measuring points

• US 5,691,904 A
• Filed: 02/22/1995
• Issued: 11/25/1997
• Est. Priority Date: 06/22/1993
• Status: Expired due to Term

• Current Assignee: PRÜFTECHNIK Dieter Busch AG (Fortive Corp.)
• Original Assignee: PRÜFTECHNIK Dieter Busch AG (Fortive Corp.)
• Inventors: Lysen, Heinrich
• Primary Examiner(s): LOUIS JACQUES, JACQUES H
• Application Number:
  US08/387,878
• Time in Patent Office: 1,007 Days
• Field of Search: 364/563, 364/561, 364/191, 364/921, 364/524.01, 364/474.01, 364/474.02, 364/474.16, 364/474.17, 364/474.19, 364/474.37, 364/560, 364/551.02, 364/550, 364/474.35, 364/167.01, 364/571.01, 364/474.06, 364/460, 364/474.34, 33/503, 33/1 M, 33/1 MP, 33/1 PT, 33/819, 33/552, 33/504, 33/520, 33/558, 33/568, 33/505, 33/550, 33/561, 33/553, 377/24, 395/183, 318/602, 318/685, 318/696, 318/39
• US Class Current: 701/300
• CPC Class Codes: G01D 21/00 Measuring or testing not otherwise provided for
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence
• CPC Class Codes: G07C 3/00 Registering or indicating the condition or the working of machines or other apparatus, other than vehicles

Abstract

The proposal is for a process and device making it possible to determine the condition of one or more machines (3) at several measuring points by means of a measuring head (MK) with measurement transducers (MW) which can be releasably fitted there and to supply to a computer the relevant measurement signal together with the characteristic data therefore obtained at the measuring point concerned. The invention lies in the special nature of the obtaining of the characteristic data. For this purpose there are at each measuring point special coding elements (5) adjustable between two possible operating states which work together with an allocated contact device (K, K'"'"') in the attached measuring head (MK) and, depending on the set operating state, permanently affect it or leave it unaffected, from which a characteristic electric signal is generated in the measuring head (MK) for each contact device (I, K'"'"') which, depending on the operative position of the appropriate coding element (5), has one or other two different possible values. The individual electric signals generated for each coding element are then fed into the computer in parallel or series as the characteristic signal of the relevant measuring point.

Claims

1. A method of identifying a measuring site on a machine, comprising the steps of:

defining a plurality of encoding elements, with each encoding elements having a plurality of working conditions, and each encoding element is defining in one of the working conditions;

engaging a plurality of contact units with the plurality of encoding elements, so that each contact unit reflects the working conditions of an encoding element;

generating an electric signal for each contact unit, the electric signal being indicative of the working condition of the encoding element, wherein the electrical signal is generated by;

providing an input signal to the contact unit, the input signal having a magnitude, and

influencing the magnitude of the input signal as a function of the working condition of the encoding element to generate the electric signal by varying the resistance of a conductive pathway for the input signal; and

identifying the measuring site based on the electric signals representative of the working conditions of the encoding elements.

2. The method of claim 1, further comprising, before the step of engaging, the step of calibrating the contact units.

3. The method of claim 2, wherein the step of calibrating the contact units comprises the steps of:

engaging the contact units with a known engagement pattern;

generating an electric signal for each contact unit;

determining whether the electric signals generated by the contact units correspond to the known engagement pattern; and

providing corrective factors to the signals from the contact units which do not correctly reflect the known pattern.

4. A system for producing signals identifying a measuring site on a machine, comprising:

a mounting piece attached to the machine;

a plurality of encoding elements attached to said mounting piece and arranged in a fixed special pattern, with each said encoding element having a plurality of working conditions, and with said encoding elements collectively acting as an identification of the measuring site;

a head assembly which is constructed to be removeably engaged to said mounting piece;

a plurality of contact units attached to said head assembly;

with each contact unit corresponding to one encoding element;

means carried by said head assembly for generating a plurality of electric signals corresponding to said contact units, the electric signals being indicative of the working conditions of said encoding elements;

means for receiving the electric signals; and

means for identifying the measuring site based on the electric signals representative of the working conditions of the encoding elements.

5. The system of claim 4, wherein said means for generating a plurality of electric signals comprises:

means for multiplexing the plurality of signals into a multiplexed signal; and

means for providing the multiplexed signal to said means for receiving the electric signals.

6. The system of claim 5, wherein said means for multiplexing comprises a counter circuit.

7. The system of claim 6, additionally comprising a power supply line which provides power to said means for multiplexing, and wherein said power supply line further comprises said means for providing the multiplexed signal to said means for receiving the electric signals, and wherein said means for multiplexing further comprises a means for multiplexing the plurality of signals into a multiplexed signal in response to controlled interruptions of the power provided on said power supply line.

8. The system of claim 7, wherein said contact units each further comprises a conductive pathway having a resistance, the resistance of each conductive pathway varies when said conductive pathway is engaged by one of said encoding elements, and the variation of the resistance of the conductive pathway is a function of the working condition of said encoding element.

9. The system of claim 8, wherein the resistance of said conductive pathway is a function of pressure applied to said conductive pathway.

10. The system of claim 9, wherein each said contact unit further comprises:

a first electric contact located at one end of each said conductive pathway, said first electric contact for receiving a source of electricity; and

a second electric contact located at another end of each said conductive pathway, said second electric contact for providing the electric signal from each said contact unit.

11. The system of claim 9, wherein said mounting piece further comprises a holder attached to said encoding elements, said holder and said encoding elements being removable from said mounting piece.

12. The system of claim 11, wherein said mounting piece has a contact surface for receiving said head assembly.

13. The system of claim 4, further comprising:

a set of mounting elements attached to said mounting piece, said set of mounting elements having a plurality of working positions;

an additional set of contact units corresponding to said set of mounting elements;

means for generating a mounting signal from said additional set of contact units, the mounting signal being indicative of the working conditions of said set of mounting elements;

means for receiving said mounting signal; and

means for determining from said mounting signal a relative position of the apparatus in the mounting piece.

14. The system of claim 4, further comprising a measuring device attached to said head assembly and engaging the machine when said head assembly engages said mounting piece.

15. The system of claim 4, further comprising a measuring device attached to the machine and connected at said mounting piece via a cable fitted with a connector at said mounting piece, said connector engaging a complimentary connector in said head assembly.

16. The system of claim 4, wherein said encoding elements are removable from said mounting piece, and each encoding element has two working conditions, one working condition when said encoding element is not removed from said mounting piece, and another working condition when said encoding element is removed from said mounting piece.

17. The system of claim 4, additionally comprising:

a measuring device which measures a condition at the measuring site and generates measured data; and

said means for generating a plurality of electric signals generates a plurality of electric signals which are both indicative of the working conditions of the encoding elements and which are indicative of the measured data.

18. An apparatus for producing signals identifying a measuring site on a machine carrying a mounting piece, a plurality of encoding elements attached to the mounting piece and arranged in a fixed special pattern, with each encoding element having a plurality of working conditions, and with the encoding elements collectively acting as an identification of the measuring site, comprising:

a head assembly which is constructed to be removeably engaged to the mounting piece;

a plurality of contact units attached to said head assembly;

with each contact unit corresponding to one encoding element;

means carried by said head assembly for generating a plurality of electric signals corresponding to said contact units, the electric signals being indicative of the working conditions of the encoding elements;

means for receiving the electric signals; and

means for identifying the measuring site based on the electric signals representative of the working conditions of the encoding elements.