DE10013023A1 - Detector and transfer device for state parameters of machines, converts structure-borne sound into electrical signal transmitted using radio-frequency modulator through main voltage line - Google Patents

Abstract

The detector and transfer device converts a structure-borne sound into electrical signal which is transmitted using a radio-frequency modulator (30) through a main voltage line at a remote evaluation unit. Preferably, the main voltage line carries 230 V supply voltage.

Description

The present invention relates to a device for detecting and transmitting Condition parameters, which are on machines or other technical equipment can be tapped. The invention particularly relates to transmission and Transmission of structure-borne noise signals on machines such as B. motors, fans, Generators, pumps, which have rotating or cyclically repeated movements To run.

Such a device is known from WO 98/08292, which describes the detection, Storage and transmission of engine characteristics are discussed.

With this device, however, it is assumed that machine data to be recorded in appropriately stored electronically. Data stored in this way are then to be called up occasionally or at regular intervals by an operator, at Use and by connecting a portable data acquisition device.

It is an object of the invention to provide a device which is compared to the aforementioned invention enables significant cost savings, especially memory-free can work and without an expensive query by an operator can be.

This task is solved with the means of the independent claims.

It is already known to permanently route machine data or signals to be recorded from a machine to be inspected into a control room, a control room or the like by means of wired transmission means. A significant cost factor in the implementation of such a solution, however, is the laying costs for new lines to be installed, which easily reach DM 10 to 50 per meter in industrial environments and therefore have to be planned carefully.

The invention solves the problem of high wiring installation cost, or cost for a regular query by an operator, in that Signal transmission medium a normally existing electrical network Supply line is used that supplies power to a machine to be inspected. The present invention is therefore less suitable for e.g. B. such machines, which be operated exclusively with compressed air or have no mains connection.

In this way it is particularly inexpensive, for. B. structure-borne noise data, Temperature data or electrical characteristics of machines to a central Transfer surveillance room.

The invention is explained below with reference to the drawing.

The machine 14 , e.g. B. a motor has an electrical connection 10 , 12 , 13 , which for fixed or pluggable connection of the electrical equipment of the machine to z. B. a 230 volt AC network is suitable. A measurement signal pickup, e.g. B. a structure-borne sound sensor 15 , or a suitable microphone, is provided for recording machine signals or data of interest. Its output signals are connected via a line 16 to the input of an amplifier 17 , which ensures amplitude-correct electrical amplification. Its output line is switched to a wired, radio frequency working device 30 . This has the function of modulating essentially low-frequency AC signals at high frequency, and then wired via a z. B. 230 V AC line to send (not shown) receiving station for such signals, where they can be decoupled from the mains voltage and demodulated, for further and intended use. For this purpose, the radio frequency device 30 has a converter RFC 31 . Such devices are commercially available per se and often have a threshold switching stage 32 , which only delivers incoming signals to further processing (modulation) when they have a certain minimum height. In the so-called embodiment of a "baby monitor", devices 30 are available at particularly low cost. The configuration described can already be used with simple and extremely cost-effective means that a machine suddenly working too loudly at a remote control station can be diagnosed as faulty.

For simple monitoring tasks, interference signals can also be accepted, which can occur in the vicinity of a powerful machine 14 due to the strong electromagnetic fields. This problem can be remedied in that, in an alternative embodiment of the invention, an output signal to be picked up by the amplifier 17 is given to an A / D converter 18 , which converts it into digital signals. For this purpose, a control processor 21 can advantageously be used, which also coordinates a subsequent conversion of possibly parallel digital signals by means of a parallel-serial converter 19 . Furthermore, the same control processor can ensure that the digital serial signals present at the output of the parallel-serial converter 19 receive additional characteristic and control values, in particular are also repeated several times, so that falsified serial signals can be recognized as such and in accordance with a so-called protocol can remain irrelevant. A downstream modem 20 then converts such serial signals back to a low-frequency analog signal, which is fed to the input of the radio-frequency device 30 . This analog signal is then modulated at high frequency by the device 30 and for further evaluation by means of one (or possibly several) suitable remotely located radio-frequency demodulators, and a low-frequency, remotely located modem (both devices not shown) via the mains line 35 and the like 230-volt supply network forwarded.

Claims (2)

1.Device for detecting and transmitting state parameters of machines, in particular for the transmission of structure-borne noise signals, characterized by a device which converts structure-borne noise into an electrical signal and the electrical signal by means of a radio frequency modulation device via a mains voltage line to a remote one Evaluation unit directs. 2. Device according to claim 1, characterized in that the mains voltage line 230 volt supply voltage leads.