DE3427993A1 - LOCKING DEVICE FOR MIN SENSORS - Google Patents

Abstract

1. Blocking device for mines, with sensors (1), each of which, when excited, generates an irreversible response signal, and with a response blocking circuit (4) which reacts to stray signals and which, when excited, generates a blocking signal to prevent the response signals form being evaluated, characterized in that assigned to each sensor (1) is a storage element (10), which is set when the response signal of this sensor appears at the same time as the blocking signal and the output signal of which, in the set state, interrupts the evaluation of the response signal.

Description

VON KREISLER SCHONWALD EISHOLD FUES FROM KREISLER KELLER SELTING WERNER

'6-

P ATE NTA N WALTE

Dr.-Ing. by Kreisler 11973 '
Dr.-Ing. KW Eishold 11981

Dynamit Nobel Dr.-Ing. K. Schönwald

Aktiengesellschaft ^ lS ₁ TaWc by Kreisler

Dipl.-Chem. Carola Keller

5210 Troisdorf Dipl.-Ing. G. Selting

Dr. H-K. Werner

DEICHMANNHAUS AT THE MAIN RAILWAY STATION

D -5000 COLOGNE 1

Sg-Fe

July 27, 1984

Blocking device for mine sensors

The invention relates to a blocking device for mines, with sensors, each of which generates a response signal when excited, and with a response blocking circuit which reacts to external signals and which, when excited
a blocking signal is generated to prevent the response signals from being evaluated.

It is known to equip mines with sensors, for example from tripwires or others on movement, warmth, touch, or the like. appealing

Feelers exist. As a rule, the sensors are designed so that they touch or move a Wire are energized and ignite the mine, especially the shooting mine. For mines with electronic detonators one can also use inductive, capacitive or piezo

Use electrical converters for sensor movements (DE-PS 22 64 210). Furthermore, sensors with motion-sensitive Light guides are applied.

Telephone: (0221) 131041 Telex: 8882307 dopa d Telegram: Dompatent Cologne

Sensors in the form of wires, light guides, or the like. can do not identify the cause of the movement that aroused them. It is therefore possible with help from detonation air pressure or splinters, such as those generated by projectiles, such sensors for Bringing appeal. The response takes place here by direct action on the sensor or by Secondary effects, e.g. branches and other parts are moved by detonation, which in turn affect the sensor trigger. In this way mines can be "cleared", i.e. by simultaneously energizing the Sensors of numerous mines detonate these mines so that they are ineffective. Chain reactions too by triggering neighboring mines are known.

To prevent such "clearing" of mines, it is known to provide a lockout circuit which reacts to external signals, such as air pressure surges from detonations, flashes of light or vibrations, and deactivates the mines' sensors when an appropriate event occurs. Usually will the locking signal is generated for a short time, i.e. the sensor signals are suppressed for this period of time or the sensor signals received in the relevant time period are deleted. The ones used for mines Sensors often have an irreversible function, i.e. once they have been excited, they keep them statically at this state. Such irreversible sensors cannot easily be used in connection with Response blocking circuits are used because they would ignite the mine after the blocking signal has ended, although the response signal was generated in a period of time that would require suppression of this signal and requires prevention of detonation. Sensors

or converters that generate irreversible excitation signals, have the advantage, however, that the signal generation is more reliable.

The invention is based on the object of creating a locking device of the type mentioned at the beginning that the mines are protected against the detonation effects of neighboring mines or space measures, although at the associated sensors irreversible response signals have been generated.

According to the invention, this object is achieved in that a memory element is assigned to each sensor that is set when the response signal of this sensor is present at the same time as the locking signal and whose output signal in the set state prevents the response signal from being evaluated.

With the selective locking device according to the invention becomes a sensor, which is detonated or similar external influence while the blocking signal is pending has been triggered, left unconsidered for the further action time, so that this sensor subsequently can no longer perform its function, i.e. the mine cannot ignite. A major advantage is that that only those sensors can ignite the mine, which is not damaged by the detonation or clearance measure have been. Damaged sensors, on the other hand, are rendered inoperable. This will take space measures, at which numerous mines are detonated at the same time by large-scale external influences .

If optical fibers are used as sensors, the length of which is monitored by a transducer, the

Λ-

It should happen that the sensor is damaged or shortened by a clearance measure. In this case the Sensor initially made ineffective after the clearance measure. He can then then through electronics can be re-measured, with the remaining length being saved as a new reference value. The rest of the way then receives the same trigger criteria as the undamaged fiber before.

In the following, with reference to the single figure of the drawing, an embodiment of the invention explained in more detail.

The drawing shows a schematic circuit diagram of the locking device for several sensors of a mine.

Wires (tripwires) are used as sensors, for example, from the mine are laid radially or linearly. Each of the sensors 1 is provided with a transducer 2, the one converts mechanical movement of the sensor into an electrical pulse signal. As a sensor with a converter For example, a device described in DE-PS 22 64 210 can be used.

The output line of the converter 2 is connected to an input of an AND gate 6. The outputs of the AND gates 6 of all sensors are in an OR gate 7 summarized. At the output of the OR gate 7, the ignition signal is generated, which is either sent directly to the mine or to an ignition logic is given.

The sensor 3 responds to external signals such as detonations or other spatial measures. The signal from this sensor

. * ■ <■

3 is fed to the response blocking circuit 4, which has an evaluation logic with filters, threshold switches, window circuits, Integrators, differentiating circuits, timers, or the like. contains in order to extraneous signals for which the sensors 1 or converter 2 must be made ineffective to recognize.

The lock signal generated by the response lock circuit 4 is, after inversion by the inverter 5, fed to a further input of each AND gate 6. At the third input of the AND gate 6 is the output signal of the memory element 10, which is the relevant Sensor is assigned.

The lock signal generated by the response lock circuit 4 is fed to the AND gates 9, which are provided separately for each sensor. The second entrances the ÜND gates receive the response signal from the associated converter 2. The AND gates 9 are connected to the set input S of the associated memory element 10 connected so that the memory element 10, for example consists of an RS flip-flop, is always set if during or shortly before the locking signal a response signal is generated at the same time.

The output signal of the memory circuit 10 is via Line 12 is supplied to the relevant AND gate 6. This output signal is only "1" when the memory element 10 is in the reset state. A common line 11 leads to the reset inputs RS all Storage elements 10.

The circuit works as follows:

In the normal standby state there is a "1" signal at all AND gates 6 via the inverter 5 and all Storage elements 10 are reset so that "1" signals are also sent to AND gates 6 via lines 12 are given. The AND gates 6 are thus prepared. As soon as the transducer in question 2 sensor or target or Delivers response signal ("1" signal), the AND gate 6 switches through and the relevant pulse passes the OR gate 7 on line 8, so that the mine is ignited.

If a detonation occurs in the vicinity of the mine, the sensor 3 which detects this condition responds to and the evaluation circuit 4 generates a blocking signal for a certain period of time. This blocking signal blocks The AND gates 6 via the inverter 5 and prepares the AND gates 9. The blocking time is a few seconds. If a converter 2 supplies a response signal during the blocking time, the corresponding AND gate 9 switches through and the memory element 10 is set. This creates a "0" signal on line 12, creating the AND gate 6 is blocked, and also remains blocked in the event that the blocking signal of the response blocking circuit 4 ends will. If a sensor 1 is triggered during the blocking time, the signal at the AND gate 6 is blocked and no ignition signal appears on line 8. In order to subsequently make the circuit effective again, you can a reset signal can be applied to line 11. A sensor that has been energized during the blocking time, can then no longer be used for target information until the reset signal is given .. To each Any number of sensors 1 can be connected to mine, but at least two sensors.

A development of the invention consists in the fact that an additional counting circuit is available, which is used in Destroying the last functional sensor ignites or clears or marks the mine.

- Blank page

Claims (3)

-r- EXPECTATIONS fy. Blocking device for mines, with sensors (1), each of which generates a response signal when excited, and with a response blocking circuit (4) which reacts to external signals and which, when excited, generates a blocking signal to prevent the evaluation of the response signals, characterized,
that each sensor (1) is assigned a memory element (10) which is set when the response signal of this sensor is present at the same time as the blocking signal and its output signal in the set state interrupts the evaluation of the response signal. 2. Locking device according to claim 1, characterized in that the storage elements (10) are several Sensors (1) of a mine can be reset by a reset signal on a common line (11). 3. Locking device according to claim 1 or 2, characterized characterized in that each sensor (1) is assigned an AND gate (6) in which the response signal, the inverted locking signal and the reset signal of the associated memory element (10) combined are. Locking device according to one of Claims 1 to 3, characterized in that the sensor (1) has a AND gate (9) is assigned, in which the response signal and the locking signal are combined and which controls the set input (S) of the memory element (10).