DE3416575A1 - DEVICE FOR UNDERGROUND PITCHING FOR TESTING AND COMPARISON OF MEASURING VALVES - Google Patents

Description

Device for underground mining for testing and calibrating transducers

The invention relates to a device for underground mining for testing and calibrating measuring transducers and remote transmission systems underground, in which stationary measuring devices are used as transmitters on an audio frequency transmission system are connected and the signals are passed to the transferring area to receivers located there will.

The transmission of measured values, status reports, etc. In underground mining, audio frequency systems are usually used. The transducers usually deliver an impressed current signal (0-1 mA) or a modulated frequency signal (5-15 Hz) that is about special audio frequency modules are transmitted to the area above ground (e.g. mine control room). Verification, as well as the adjustment of the downstream remote transmission have so far only been possible in connection with the corresponding transducers possible. Here, difficulties often arise with regard to communication between the equipment operator (under Days) and electricians (mine supervisors), especially in the case of weather-related measuring devices with analog displays (Gas measuring devices, weather speed measuring devices) achieved a relatively low reading accuracy will. The time required is particularly high here because the simulation of the measured values required for the adjustment often done by applying test gas. A quick statement regarding the functionality of the audio frequency remote transmission is also not possible.

The present invention seeks to verify and the adjustment of transducers and remote transmission

underground systems are much faster, more reliable and easier to manage.

To solve the problem, the invention is characterized in that an intrinsically safe signal generator as a step-by-step switchable current and frequency generator instead of the stationary measuring devices underground the audio frequency system can be connected.

The proposed, intrinsically safe signal generator enables the simulation of the measured value signals common underground. The encoder has a switchable output (0 - 1 mA or 5 - 15 Hz). Five fixed signal parameters can be preselected using a rotary switch. By using the Time-consuming adjustment work on the measuring transducers (e.g. test gas tasks) for calibration is no longer necessary the remote transmission facility. The communication between the equipment operator and the mine operator is optimized, since only predefined signals are used for adjustment. Errors in remote transmission also become quick and reliably recognized.

For test and adjustment work, the current frequency generator is connected to the audio frequency system instead of the stationary measuring devices connected. The operating mode as frequency transmitter or current transmitter is set with a rotary switch, with a second rotary switch, the output of the generator is adapted to the measuring device to be connected. The measuring range can then be simulated with the rotary switch using five fixed values.

In a housing cover, which is sealed and detachable with the housing is itself connected, battery cells, a fuse and two resistors are housed and encapsulated. The resistors and the fuse ensure their own safe output current.

When the switch is in the "Charge / Off" position, the rechargeable Battery cells can be charged via the two measuring sockets of the device. Two light-emitting diodes indicate during of the operation as a current or frequency transmitter to the battery condition, whereby the one light emitting diode "the condition "ready for operation" and the other light-emitting diode indicates the state "under voltage", so that in the latter case the device must be charged before use.

The intrinsic safety of the device is not only achieved by limiting the battery short-circuit current _f through the fuse and the resistors as well as by potting the entire energy block, but also by potting the three mentioned light-emitting diodes and the galvanic separation of the frequency output of the frequency generator by means of an optocoupler. In addition, the surface resistance of the

Plastic housing less than 10 ohms.

The subject matter of the present invention results not only from the subject matter of the individual claims, but also from the combination of individual claims among themselves. All information and characteristics disclosed in the documents, in particular the spatial configuration shown in the drawings are claimed as being essential to the invention, insofar as they are new to the state of the art, individually or in combination.

In the following, the invention is explained in more detail with the aid of drawings which show only one embodiment explained. Further features essential to the invention can be found in the drawings and their description and advantages of the invention.

Show it:

Fig. 1ί side view of the housing of the signal generator,

Fig. 2: Front view of the housing according to Fig. 1,

Fig. 3: Front view of the housing according to Fig. 1 and Fig. 2,

Fig. 4: Top view of the removed housing cover with encapsulated energy block,

Fig. 5: Side view of the housing cover according to Fig. 4, Fig. 6: Switching of the rotary switch 3,

Fig. 7: schematically drawn circuit diagram of the signal generator.

The housing 1 made of plastic has a front plate 2 on which the two light-emitting diodes 5 for the display of the battery status (ready for operation or recharging) are arranged. Below these LEDs 5, a further light-emitting diode 6 is arranged, which lights up to the rhythm of the frequency signal emitted when the frequency generator 13 is connected externally. With the Rotary switch 3 is used to select the operating state, namely "load / off" or the frequency generator 13 is switched on or the current transmitter 12.

With the throttle switch 4, different signal parameters are set, as shown in the labeling at the lower part of the front panel 2 results.

In the housing 1, the electronic circuit board 8 shown in more detail in FIG. 7 is attached, with on the end face of the housing 2 two measuring sockets are available.

Via either the energy block with its own battery cells 16 is charged, or via which the current or frequency signal is output.

The housing 1 has a removable housing cover 14 on which a non-running seal 18 is provided, the housing cover 14 being screwed to the housing 1 with screws passing through the bores 15. This means that the entire energy block 9, which is cast in the housing cover 14 into the cover base 10, is sealed against the housing 1 and the outside environment.

The energy block 9 in the lid base 10 consists of battery cells 16 connected in series, which, according to the circuit in FIG. 7, are preceded by a fuse and two series resistors. These serve to limit the output current to meet the requirement to be fulfilled according to the self-protection of the device.

From Fig. 4 and Fig. 5 it can be seen that the fuse 11, the series resistors 17 and the battery cells 16 in the The cover base 10 of the housing cover 14 is completely encapsulated with plastic resin 19. It's just that Cable connections 20 led to the outside.

FIG. 6, in conjunction with FIG. 7, shows the interconnection of the measuring sockets 7 with the internal connection points P 1 - P 8.

The current generator 12 shown in Fig. 7 is through connection of the energy block 9 to the connection points B6 and B8 activated. Via the shown voltage stabilizer 78o8 the battery voltage is fed to an operational amplifier CA 1458 connected as a comparator, the output of which is are switched on via different sized zener diodes to display the battery status.

If the comparison voltage set on the comparator is not reached, the upper light-emitting diode 5 is activated, while the lower light-emitting diode 5 is activated when it is exceeded, which indicates the operational readiness of the device The rotary switch 4 can then be used to connect series resistors to one of the input branches of an operational amplifier can be switched on, at the other branch of which a fixed bias voltage is applied. The operational amplifier emits a direct current signal that can be changed in steps with the rotary switch 4, which is applied via the transistor to the connection points P3 and P4 and via the rotary switch 3 at the corresponding Switching is applied to the measuring sockets 7.

The frequency generator 13 consists essentially of the known timer module 7555, the frequency of which is selected via the resistors that can be switched on in cascade with the rotary switch 4. The output of the timer module is fed to an optocoupler 21, which carries out a galvanic separation to the starting points P1 and P2. When the rotary switch 3 is switched over accordingly (see FIG. 6), the signal from the frequency generator 13 is then generated applied to the measuring sockets 7.

DRAWING LEGEND

1 housing

2 front panel

3 rotary switches

4 rotary switches

5 light emitting diode

6 light emitting diode

7 measuring socket

8 electronics board

9 energy block

10 lid base

11 Backup

12 current sensors

13 frequency generator

14 housing cover

15 holes

16 battery cells

17 series resistor

18 seal

19 plastic resin

20 cable connection

21 optocouplers

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Claims (7)

Subject: Applicant: Company Seba-Dynatronic, Mess- und Ortungstechnik GmbHf Industriestrasse 6, 8601 Baunach and Company Ruhrkohle AG, Postfach 10 32 64, Essen 1 10 Patent applications 1. Apparatus for underground mining for testing and for the adjustment of transducers and remote transmission systems underground, where stationary measuring devices as Transmitter connected to an audio frequency transmission system and the signals are sent to the above-ground area to receivers located there, characterized in that an intrinsically safe signal generator (12,13) as a step Switchable current and frequency transmitter instead of the stationary measuring devices underground to the audio frequency system is connectable. 15th 2. Apparatus according to claim 1, characterized in that the intrinsic safety of the signal generator is achieved in that in a sealing over a circumferential seal (18) Telephone: Telex: ■ a Lindau (0 83 82) 54374 (pat-d) 50 25 Telegram address: Facsimile / Telecopier bank accounts: Post Lindau Bayer. Vereinsbank Lindau (B) No. 120 8578 (BLZ 735 200 74) Sf (08382) 24222 Hypo-Bank Lindau (B) No. 6670-278920 (BLZ 733 204 42) - - - ' ·> K_iu "K""i, ι In ^,., Na No <; i79nnno IRI.Z 735 901 20) Postscheckkon Munich 295 with the housing (1) connected housing cover (14) a series connection of rechargeable battery cells (16) together with series resistors (17) and Fuse (11) is cast. 3. Apparatus according to claim 1 or 2, characterized in that the signal generator has an optionally switchable plague current output (0-1 mA) or signal output (5, -15Hz), and that a number of fixed signal parameters can be preselected via rotary switches (3, 4). 4. Apparatus according to claim 2, characterized characterized that in the position of the rotary switch (3) "Charge / Off" the battery cells (16) can be charged via the measuring sockets (7) of the housing (1). 5. Apparatus according to claim 4, characterized in that two light emitting diodes (5) during operation of the signal generator (12,13) show its operating status, and that the one light emitting diode (5) the operational status and the Another light emitting diode indicates the undervoltage of the battery cells. 6. Apparatus according to claim 1, characterized gekennzeic hn et that the housing (1) from Plastic with a surface resistance of less than 10 ⁹ ohms. 7. Apparatus according to claim 2, characterized in that the frequency output (P1, P2) of the frequency generator (13) via optocoupler (21) is galvanically isolated from the potential of the electronics board (8).