DE10029918B4 - Method and device for detecting the presence of persons in underground mining - Google Patents

Abstract

Method and device for detecting the presence of persons in mining struts developed with expansion points in underground mining, wherein at least a part of the expansion station (10) associated with detection sensors (25) which are coupled to control means (27) for the expansion station, wherein the detection sensors the Scan working and operating area (24) of the associated expansion station and shut them down in their movements when the presence of a person is detected in the detection range (30) of the sensors. According to the detection sensors of the individual expansion point of the control devices are switched on and off and are only activated when the associated expansion rack to be moved and are disabled after completion of the movement of the associated expansion rack again. The monitoring of the longwall is therefore only in the endangered by the movement of a frame area, so that a potentially harmful to the miners acting electrosmog is limited by emitted by the detection sensors electromagnetic waves to a minimum.

Description

The The invention relates to a method for detecting the presence of Persons in struts developed with expansion points in underground mining, wherein at least a portion of the expansion site detection sensors associated with control devices for the expansion station coupled, wherein the detection sensors at least the working and scan operating range of the associated expansion station and shut them down in their movements or one Do not allow movement of the assigned expansion point when in Detection range of the sensors detected the presence of a person becomes. The invention is further directed to a device for detecting the presence of persons in struts developed with expansion posts directed in underground mining, with at least one Part of the expansion unit are associated with detection sensors, the coupled with control equipment for the expansion station are and at least the working and operating area of the assigned Scan the expansion station.

At the modern mining of coal or other minerals in the underground Mining is carried out by means of one in a longwall between two Stretch reciprocable mining machine, for example a cutting machine or an extraction planer, wherein the hanging wall in the longwall of a variety of juxtaposed Underpinning and supported support is usually all on a conveyor for transporting the coal recovered or materials are attached to which also the mining machine leads.

To the passage of the mining machine become conveyor and Expansion site advanced in the direction of the mining front, Why, after advancing the conveyor, the individual Dismantling site one by one retracted (robbed), Then, with the help of a Schreitzylinders in the direction of the conveyor pull forward (step) and then the hanging end cap Extend again until the specified support pressure is reached and the hanging wall is safe again (set). The way of working Such a step expansion is known in the art well known.

At the modern expansion is any expansion rack with its own electrical or electro-hydraulic control provided, the controls with each other for the exchange of information with each other can be connected, which also dependent Movements on several, juxtaposed Shielding can be performed. The different Movements of an expansion rack can be done automatically by triggered a higher-level control room and be carried out independently, but it is also possible, a selected expansion rack manually over the Keyboard of a control unit to move, being in this Do not trap the arranged on the moving stand itself Control unit is operated by hand, but that in the adjacent building block arranged control unit, via a control line to the control unit of the expansion rack to be moved is connected (neighborhood control).

A Movement of a dismantling station, that is, retraction the Hangendkappe (Rauben), striding towards the longwall conveyor and again extension of the Hangendkappe (setting) may take place only if in the working and operating area of the respective expansion rack no person is located to avoid personal injury. As a working and operating area of an expansion rack should here the one from the hanging end cap, the lying skids, the back one Fracture shield of the expansion rack and arranged in front of this Strebförderer limited area to be understood, therefore that section of a longwall supported by a building block becomes. To avoid movement of the expansion frame, as long as If persons are present in this danger zone, monitoring devices can be used and methods that are used to rob, step and Set the racks only allow if no persons through this are at risk.

From the DE-OS 36 27 174 there is known a generic method and a device of the type mentioned in the introduction, wherein the detection sensors are arranged at the removal points, wherein each sensor emits a continuous signal to monitor the respective detection range. In the known method, each individual carries in the longwall a transponder, so a small transmitting and receiving unit, which cooperates with the detection sensors at the individual development sites and is then located by a sensor when the person is in the detection range of the respective sensor. As soon as a sensor receives a signal from the transponder, it gives to the control device of the expansion rack a control signal, as a result of which the control device of the expansion rack, in which the person is located, overrides the normal control functions and prevents the movement of the rack as long as long the person is in the working and operating area of the rack.

The known device and the known method have the disadvantage that all detection sensors are permanently activated in the longwall, resulting in a relatively high power consumption results, which must be covered by complex, intrinsically safe circuits. Through the permanent activity tion of all sensors in the longwall are carried by the individuals transponder permanently active and have a large energy needs, which must be covered by a portable power supply (battery, rechargeable battery) and is relatively large and heavy at a required minimum operating time of ten hours. In addition, in the known method and apparatus, the detection sensors permanently emit electromagnetic signals which, with permanent activation of all sensors, result in non-negligible electrosmog in the face, which may have health effects on the persons working in the face and possibly influence their ability to concentrate , which endangers the safety of the miners. In addition, the permanent activation of all the sensors and the electromagnetic waves emitted by them can also easily lead to faulty switching if the electromagnetic signals emitted by one sensor are possibly distorted after multiple reflection or the like and are misinterpreted by another detection sensor as the signal of a transponder, and to shut down a demolition site, in whose working and operating area there is no miner and therefore could be moved safely.

From the DE 40 16 959 A1 a location system is known, in particular for underground mining, in which the location transmitter can be switched on in case of need and switched off at the appropriate time. A person to be located, in particular a miner, carries a localization transmitter, which can be detected by means of a locating receiver which a searching person carries. To get out of the DE 40 16 959 A1 known location system to keep the power requirement low, the location transmitter is designed as a receiver for electromagnetic waves that are emitted by a remote switching transmitter, drt can preferably be worn by the person seeking. The location transmitter works only when the location is technically meaningful, therefore if the remote switch transmitter is located locally in the reception area of the location transmitter and thus the person to be searched.

From the DE-AS 2 026 168 a device for securing persons equipped with transmitters in underground operation is known in which are arranged in hazardous areas in the underground operation and / or at their entrances tuned to the transmission frequency of the transmitter receiver, which switching or counting devices are connected to, thus automatically detect whether or not a person is within a relatively large area. To limit the space, the entire area is surrounded by a shielding cage.

task The invention is a method and a device of the above mentioned type, in which electrosmog in the longwall due the detection sensors are avoided and where the power requirement not only the detection sensors, but also the ones to be monitored Persons possibly carried transponders possible is low.

These Task is with the inventive method solved by the detection sensors of the control devices of the associated expansion station activatable are activated and before a planned movement of the expansion station and deactivated again after the movement is completed. The inventive device is accordingly characterized in that the detection sensors of the control devices of the associated expansion station activatable and can be deactivated.

To The invention thus the detection sensors in the strut of the Control devices of the sensors associated with the expansion station only then activated when a movement of the dismounting frame is imminent. Usually Shield movement is about five seconds before starting the movement announced by a warning signal. At about the same time then also the moving frame to be moved associated detection sensor activated after its activation the working and operating area of the affected expansion site scans to determine if a person is in the danger zone located. The sensor remains activated until the movement (Robbing, striding, setting) of the expansion rack completely is finished and then by the associated control device switched off again. According to the invention are therefore the detection sensors arranged on the expansion points mostly disabled and are only turned on when a rack to be moved. Through this selective control of the individual Sensors is the power requirement of the monitoring device only low and a burden of miners by electrosmog negligible small or not given at all.

expedient Each expansion rack has at least one separate detection sensor but it is also conceivable, detection sensors only at each provide second expansion rack, wherein the detection range of Sensors then so big that with it also the Working and operating area of the two adjacent extension points can be monitored with.

The scanning of the working and operating areas of the expansion point is preferably carried out according to an active / passive marking method, in which the persons in the long range are equipped with a transponder device which is activated by an activated detection sensor itself when the person enters or is in the sensed detection range of the detection sensor and then transmits a presence signal to the detection sensor, as a result of which the detection sensor intervenes Stop signal to the associated control device outputs. Since in this embodiment of the invention, the ge by a miner, for example, on the helmet or on the belt carried transponder device is activated only when the miner is in the working and operating area of an expansion rack, which is to be moved shortly, and accordingly only in this comparatively rare Case ever outputs a presence signal, the power consumption of the transponder is low, because this is most of the time in a "standby" mode with low energy consumption. It is therefore sufficient to provide a comparatively small and thus light battery or a battery for powering the transponder device.

In preferred embodiment of the invention Procedure, the detection sensors key their respective detection range cyclic with a maximum cycle time of 0.2 seconds from. The cycle time of the sampling is expedient in the range between 10 and 100 milliseconds. This means that one Person in the detection range of a sensor and thus in the working and operating area of the corresponding building extension comes within the very short, in any case less than 0.2 seconds Cycle time recorded and the presence of the person through Output of the stop signal is displayed to the controller, so that too an already in progress expansion rack in fractions of a second can be shut down to those who got into the danger zone Person not to endanger.

A particularly advantageous because simple design results, when the signals generated by the detection sensors DC signals are of different voltage, the DC signals from the controller in its different height can be easily recorded and evaluated and where by suitable loggers also do not log only the stop and release signals issued by the detection sensors, but also of set operating states or the like is easily possible.

Of the Detection range of each detection sensor preferably detects the working and operating area of the assigned expansion rack and at least part of the working and operating areas of each neighboring development site. A sensor can not only detect whether a person is in the assigned expansion rack, the should be moved or already moved, but can also determine whether a person in the neighboring building block in the vicinity of the moving or moving frame comes and possibly short term in the working and operating area of this frame arrives, so that its movement already prevented or Can be stopped before a person reaches the actual danger area enters.

Preferably The detection sensors cyclically perform a self-test by, and expediently only if, after Activation of a detection sensor and scanning of its detection area no person is detected by the sensor. Through the self-test the sensors are detected fault conditions very quickly and can be reported to the control of the expansion rack and by means of a display device, such as a light emitting diode are displayed.

The Detection sensors can vary in size Working and operating areas of the expansion station be adjustable, which reliably prevents false positives of a sensor which otherwise may be due to non-adaptation of the Sensors to the height, width and depth of the expansion rack can occur in the operating state. expedient the detection sensors are arranged in protective housings, where they face the harsh operating conditions in the underground Mining are protected. To avoid the risk of firedamp The detection sensors can be used in the intrinsically safe power range work as it is known in underground mining and is often required. For example, the detection sensors arranged on the stamps of the expansion point or on their Hangendkappen be.

Especially It is advantageous if the detection sensors each substantially consist of a transmitting unit and a receiving unit, wherein the transmitting unit is a signal for activating one of a person worn transponder device emits in the detection area and the receiving unit one of the thus-activated transponder device sent signal, which then sent to a shield monitoring unit which evaluates it and as a control signal for interruption the shield movement of the control electronics of the respective expansion rack supplies.

An exceptionally advantageous and particularly advantageous embodiment of the invention results when the transmitting unit has a magnetic field antenna arrangement with two parallel aligned, in-phase connected ferrite coil antennas, wherein the two ferrite coil antennas each preferably connected in series with a capacitor. The then suitably next to each other approximately parallel to the cap of the respective expansion rack arranged on this ferrite coil antennas produce a common, complementary and magnetically amplifying field with an approximately elliptical extent in the plane whose larger half-axis between the two antennas parallel to these and their smaller semi-axis transverse to Antenna longitudinal direction runs. The field can thus be adapted to the planform of the respective expansion rack, so that it is possible with each one transmitting unit to monitor the longer than broad expansion rack completely, but without the immediate neighboring racks also detect. Of course, the longitudinal direction of the ferrite coil antennas extends expediently approximately transversely to the longitudinal direction of the longitudinal direction. For optimum adaptation of the two antennas to the dimensions of the respective expansion rack, it is expedient if the antennas are mounted in their distance adjustable from each other on the expansion rack.

Preferably has the receiving unit three mutually angularly arranged Reception coils, which are thereby able, one of the transponder device emitted, only one-dimensionally generated presence signal reliably and regardless of which direction to receive the presence signal actually from the transponder device is emitted. For this purpose, the three receiving coils of a receiving unit advantageously arranged at right angles to each other.

In in a similar way to the detection sensors the transponder devices be configured and one each Receiving device and a transmitting element, the receiving of the signal transmitted by the transmitting unit by the receiving device is activated by this. The receiving device then has three at an angle to each other arranged individual receiver, the are preferably aligned at right angles to each other.

It has proven to be particularly advantageous for the practice, if the ferrite coil antennas of the transmitting unit with a frequency be operated between 7 and 11 kHz. Try with a frequency of 9 kHz have shown particularly good results.

For the achievement of the desired, elliptical field shape the ferrite coil antennas are best spaced between 100 and 180 mm apart from each other on the support frame, given the given Floor plan dimensions of an expansion rack of about 4 times 1.5-2 m has a distance between 120 and 150 mm as made sense.

The generated by the activated transmitting element of the transponder device Presence signal is preferably at a frequency between 1.5 and 2.5 MHz. The experiment has a frequency of 2 MHz proved to be particularly practical, which certainly big enough is subject to interference from other electronic components Exclude days, on the other hand is still low enough, to produce the desired magnetic field.

Further Features and advantages of the invention will become apparent from the following Description and the drawing, wherein a preferred embodiment of the invention explained in more detail by way of example becomes. It shows:

1 a side view of one of several juxtaposed in the longwall expansion points with a device according to the invention for carrying out the method according to the invention;

2 a highly schematic plan view of a part of the longwall with expansion points after 1 on a smaller scale.

3 a block diagram of a preferred embodiment of the detection sensor used in the invention;

4 the antenna arrangement of the transmitting unit of the detection sensor according to 3 ; and

5 a block diagram of a preferred embodiment of the person worn transponder device.

For a better understanding of the invention, reference is made to DE-OS 36 27 174 or the corresponding British patent application GB 85/21 813 , which is hereby expressly made the disclosure of the present application.

In 1 is with 10 an expansion frame, which is part of a striding longwall mining underground, as it is common in the mining of coal and other minerals in modern underground mining. For the expansion of the longwall are a variety of expansion points 10 in the long run 11 juxtaposed, as in 2 is indicated in a schematic plan view.

The expansion station consist in a known manner essentially of one on the footwall 12 lying lying frame 13 , one with this over a Lemniskatengetriebe 14 articulated broken shield 15 and with this in turn articulated Hangendkappe 16 . extending over two support cylinders 17 supported on the lying frame and the hanging wall 18 underpins. In the front, to the dismantling front 19 pointing out area 20 the prone frame is this over a only indicated return cylinder 21 with a longwall conveyor 22 coupled, which in turn is a mining machine 23 can move along in 2 is indicated as a roller cutter and in a known way when driving through the longwall the coal on the mining front wins, which then with the longwall conveyor 22 is transported away. After the passing of the mining machine 23 on a support frame 10 is in a known manner consisting of individual channel shots and thus articulated in its longitudinal direction Strebförderer 22 from the rear cylinders 21 the expansion point forward in the direction of the mining front 19 moved, like this in 2 at the with 10d designated expansion rack is indicated. Subsequently, in a likewise known manner, one expansion rack after the other by retracting the support cylinder 17 and thus lowering the hanging end cap 16 from the hanging wall 18 robbed by retracting the back cylinder 21 forward in the direction of the mining front 19 moved (stepping) and then by extending the support cylinder 17 set in the new position again. The operation of such a striding expansion is well known and therefore needs no detailed, detailed explanation.

To avoid accidents involving personal injury, which could occur when people are in the hangum 16 , the lying frame 13 and the rear rupture shield 15 limited work and operating area 24 stop while the body builder performs one of his moves to steal, move or set, are the expansion point 10 provided with means for detecting the presence of persons, which is the subject of the present invention. For this purpose, all expansion points have detection sensors 25 on that in protective housings 26 at the bottom of the hanging end caps 16 are arranged. The detection sensors are via control lines 31 with individual control units 27 in conjunction, which are indicated schematically in the figures. The control units of each expansion station in turn are interconnected via control cables, as indicated by the dashed lines in 2 is indicated and as it is known in longwall construction controls.

The individual expansion points 10a to f) associated with detection sensors 25a ) to f) consist of a transmitting and receiving unit, by the associated individual control units 27 can be activated and deactivated. The mode of operation is such that the detection sensors of the various, in the str 11 juxtaposed expansion station 10 are not permanently activated, but only work the sensors of those expansion station, the just one of their movements (robbing, striding, setting) to run or soon to perform. This issue is best off 2 recognizable.

At the in 2 illustrated expansion points 10a ) to f) are the two frames shown on the left 10a ) and b) already in their new, towards the mining front 19 advanced position. Your detection sensors 25a ) and 25b ) are not activated, so they indicate the presence of a person in the work area 24 these frames do not appeal. At the next expansion stage 10c ), the next rack towards the mining front 19 to advance and reset there is the detection sensor 25c ) from the associated control unit 27c ), which is due to the radiated by the sensor signal waves 29 is indicated. The detection range of the sensor 25c ) is in 2 With 30 indicated in dotted lines and not only largely covers the working and operating area 24c ) of the expansion rack 10c ), but also covers some of the work and operations areas 24b ) and 24d ) of the neighboring development site.

The detection sensor 25c ) is from the associated controller 27 activated about three to five seconds before the time to start the movement of the frame by retracting the hanging end cap. The detection sensor 25c ) thus begins the detection area three to five seconds before the planned robbery 30 scan to see if there is any in the work and operating area 24c ) of the expansion rack to be moved or in the transition areas to the neighboring expansion points is a person who could be endangered by the movement of the frame. Sets the detection sensor in the hazardous area 30 a person, he sends to the individual control a stop signal that prevents movement of the frame or stops immediately, as long as the person in the detection area 30 the sensor stops.

The detection sensor 25c ) remains activated until the complete sequence of movements when stealing, stepping and setting the expansion rack is completed. The sensor cyclically scans the operating and operating area of the shield and partially the adjacent shields with a short cycle time of about 20 milliseconds and sends to the controller at the end of each scan cycle 27 a new signal, which is either a release signal when no person has been detected in the hazardous area, or provides as a stop signal for an immediate interruption of the movement process, when during robbing, walking or setting a person in the Erfbe rich 30 of the sensor.

Once the expansion rack has reached its new, forward position and like the previously moved racks 10a ) and 10b ) has been set in the new position, the detection sensor of this frame is disabled, so no longer scans the working and operating area of the then set frame.

In the 3 to 5 is a particularly advantageous and preferred embodiment of a detection sensor 25 and a transponder device 32 ( 5 ) shown schematically. As it turned out 3 results, a detection sensor consists essentially of a transmitting unit 33 and a receiving unit 34 wherein the transmitting unit begins to emit a signal from a transponder device (approximately three to five seconds before the step of the respective disassembly frame); 32 in 5 ) received by a person who is in the detection area. The signal emitted by the transmitting unit then activates the transponder device, which in turn outputs a signal which is received by the receiving unit of the detection sensor.

As is clear from the 3 and 4 can recognize, the transmitting unit has a magnetic field antenna arrangement 35 with two parallel aligned, in-phase switched ferrite coil antennas 36 , each with a capacitor 37 are connected in series. The juxtaposed ferrite coil antennas 36 are on the hanging end cap of the associated expansion rack 10 approximately horizontally, that is arranged parallel to the cap so that its longitudinal direction points in the direction of the mining front. As 4 shows is of the two spaced approximately 120 to 150 mm apart ferrite coil antennas 36 a common, complementary and magnetically amplifying field 38 produced, which has an approximately elliptical shape in section, whose larger semi-axis in the longitudinal direction of the coils 36 runs. The resulting by superposition of the field lines field gain is thereby achieved with substantially the same power consumption, which also has a single ferrite coil antenna having an approximately circular sensing and detection area as in 2 at 30 is indicated. The preferred elliptical shape of the field 38 has the particular advantage that the shape of the field with RESIZE ßerer length than the width of the planform of the respective expansion rack 10 is adapted, which is also longer in the direction of travel than in its width, which extends in the longitudinal direction of the longwall. It can therefore be the entire working and operating area 24 the respective shield are scanned with only a slight overlap of the corresponding area of an immediate neighboring shield with only one detection sensor, which in turn has the advantage that a person may also be in the immediately adjacent shield when stepping an expansion rack, for example, from there with the help of neighborhood control Manually control the adjacent signboard or monitor the automatic robbery, walking and setting process with your own eyes.

That of the two ferrite coil antennas 36 generated field is a one-dimensional call field whose frequency is from a frequency generator 39 is determined and in the preferred embodiment is 9 kHz. To ensure that the transponder device in each case of the one-dimensional Aufruffeld 38 is activated when it comes within the detection range of the detection sensor, regardless of their relative orientation in the field 38 , she is with a receiving device 40 with three individual receivers 41 equipped, which are each arranged at right angles to each other in the carried by a person Personalenkennbaustein and thus allow optimum reception in all directions of a three-dimensional coordinate system that in 5 should be indicated by the names of the coordinate axes X, Y and Z. That of the transmitting unit 33 of the sensor 25 generated field is received by the receiving device of the transponder, as soon as the transponder in the detection area 30 is in which the field signal is strong enough, and then activates the transmitting element 42 the transponder device, which in turn generates a one-dimensional response field with a frequency of preferably about 2 MHz. The presence of this response field is provided by the receiving unit 34 of the detection sensor 25 which then outputs a warning signal to a logic circuit 43 that outputs via control lines 31 optical alarm on warning lamps (LEDs) 44 triggers and stops the movement of the corresponding expansion rack immediately. Since the response field generated by the transmitting element is also a one-dimensional field, the receiving unit of the sensor also has three receiving coils 45 , Which are arranged at right angles to each other in the sensor and thus always reliably detect the response field, regardless of which spatial orientation the transponder device in the area of the expansion rack currently occupies.

It can be seen that, according to the method according to the invention, monitoring of the longwall to avoid endangerment of persons by walking expansion station always takes place only in the area in which a danger to the miner can actually occur. Unlike the prior art, therefore, only a small portion of the longwall is scanned by the electromagnetic waves of selected sensors, so that the miners working in the longwall are not exposed to permanent electrosmog. Also by the miners when using a so-called active / passive Mar. kierungstechnik carried transponder devices, which are in turn activated by an activated detection sensor and transmit to the receiving part of the detection sensor, a response signal, are switched from their stand-by mode in the transmission mode only when the person carrying the transponder comes into the danger zone, which the sensor of a currently in motion or shortly to be set in motion expansion rack is scanned.

Around to further improve the safety of the process the detection sensors perform a self-test at the end of a sampling cycle, to make sure the sensor is working properly. The self-test of the detection sensor occurs when, after activation of the Sensors and scanning the detection area in it no person was determined. Should, however, when scanning the detection area a person in the working and operating area of the expansion building or in the transitional area to the neighboring development sites has been recognized, is the implementation of a self-test not required and the detection sensor sends its stop signal without Comparison with the result of a self-test directly to the Control unit.

The from an activated detection sensor to the associated one Controller transmitted results of cyclical repeated scans are in a suitable, not shown Storage device detected and logged and can later retrieved and analyzed by the operator of the plant. This can also later in case of malfunction of the monitoring device be determined, which led to the error and the malfunction has triggered.

The Invention is not on the illustrated and described embodiment limited, but there are many changes and supplements without departing from the scope of the invention. For example, it is conceivable to monitor the labor market and operating range of an expansion rack several individual sensors to arrange in different places of the frame to this optimally to monitor. In carrying out the inventive Procedure, it is quite possible, the detection sensors not just to activate an expansion stall, but possibly also the sensors of the two neighboring racks, so the forbidden one Enlarge area where people are during not be allowed to move a frame. Decisive for The invention is that not all sensors of all expansion station in the longwall are activated simultaneously, but only the sensors in work in the area in which threats to People actually occur due to the movement of the racks can.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3627174 A [0006, 0033]
• - DE 4016959 A1 [0008, 0008]
• - DE 2026168 A [0009]
• GB 85/21813 [0033]

Claims (36)

Method for detecting the presence of persons in struts developed with expansion points in underground mining, wherein at least a part of the expansion station associated with detection sensors, which are coupled to control devices for the expansion station, the detection sensors scan at least the working and operating area of the associated expansion station and this shut down in their motion sequences or do not allow movement of the associated expansion point, if the presence of a person is detected in the detection range of the sensors, characterized in that the detection sensors ( 25 ) from the control devices ( 27 ) of the associated expansion point ( 10 ) and can be activated before a planned movement of the 10 ) and deactivated again after the movement is completed. Method according to claim 1, characterized in that each frame ( 10a -F) at least one own detection sensor ( 25a -F). Method according to claim 1 or 2, characterized in that the detection sensor ( 25 ) of an expansion rack to be moved ( 10 ) is activated one time before the planned frame movement and then the working and operating area ( 24 ) at least the associated expansion rack ( 10 ) and the control device ( 27 ) transmits a stop signal if the presence of a person is detected during the scanning, or transmits a release signal if no person is in the scanned area during scanning ( 30 ) is detected. Method according to one of Claims 1 to 3, characterized in that the scanning of the operating and operating areas ( 24 ) of the development site ( 10 ) is carried out according to an active / passive marking procedure in which the 11 ) are equipped with a transponder device that is activated by an activated detection sensor ( 25c ) is activated when the person enters the scanned area ( 30 ) of the detection sensor ( 25c ) or is located in it and then to the detection sensor ( 25c ) transmits a presence signal, as a result of which the detection sensor ( 25c ) a stop signal to the associated control device ( 27 ). Method according to one of Claims 1 to 4, characterized in that the detection sensors ( 25 ) their respective scope ( 30 ) Cyclic sampling with a cycle time between approx. 2 and 200 ms. Method according to claim 5, characterized in that that the cycle time is preferably in the range of 10 to 100 ms is. Method according to one of Claims 1 to 6, characterized in that that of the detection sensors ( 25 ) are DC signals with different voltage. Method according to one of claims 1 to 7, characterized in that the of the detection sensors generated signals are binary and those to be transmitted Information is encoded by serial protocols. Method according to one of Claims 1 to 8, characterized in that the detection area ( 30 ) of each detection sensor ( 25c ) the working and operating area ( 24c ) of the associated expansion rack ( 10c ) and at least part of the working and operational areas ( 24b . 24d ) of the respective adjacent development site ( 10b , d). Method according to one of Claims 1 to 9, characterized in that the detection sensors ( 25 ) carry out a self-test cyclically. Method according to claim 10, characterized in that the self-test of a detection sensor ( 25 ) is only performed after its activation if, during scanning of the detection area ( 30 ) no person is detected by the sensor. Device for detecting the presence of persons in upgraded struts in underground mining, wherein at least a part of the expansion station detection sensors are assigned, which are coupled with control devices for the expansion station and which scan at least the working and operating area of the associated expansion station, characterized that the detection sensors ( 25 ) from the control devices ( 27 ) of the associated expansion point ( 10 ) can be activated and deactivated. Device according to Claim 12, characterized in that the detection sensors ( 25 ) on different sized working and operating areas of the building ( 10 ) are adjustable. Device according to claim 12 or 13, characterized in that the detection sensors ( 25 ) the coverage area ( 30 ) cyclically with a cycle time of at most 0.2 s. Device according to one of Claims 12 to 14, characterized in that the detection sensors ( 25 ) in protective housings ( 26 ) are arranged. Device according to one of Claims 12 to 15, characterized by logging devices for detecting and recording the setting of the detection sensors ( 25 ). Device according to one of Claims 12 to 16, characterized in that the detection sensors ( 25 ) via control signal lines with the control devices ( 27 ) are connected. Device according to one of Claims 12 to 17, characterized in that the detection sensors ( 25 ) work in the intrinsically safe power range. Device according to one of Claims 12 to 18, characterized in that the detection sensors ( 25 ) preferably on the wall end caps ( 16 ) of the development site ( 10 ) are arranged. Device according to one of Claims 12 to 19, characterized in that the detection sensors ( 25 ) Display devices are assigned. Device according to claim 20, characterized that the display device of light-emitting diodes or the like consist. Device according to one of Claims 12 to 21, characterized in that the detection sensors ( 25 ) each substantially from a transmitting unit ( 33 ) and a receiving unit ( 34 ), wherein the transmitting unit ( 33 ) a signal for activating a transponder device carried by a person ( 32 ) within the scope ( 30 ) and the receiving unit ( 34 ) from the activated transponder device ( 32 ) receives transmitted signal. Device according to one of Claims 12 to 22, characterized in that the transmitting unit ( 33 ) a magnetic field antenna arrangement ( 35 ) with two parallel-aligned, in-phase switched ferrite coil antennas ( 36 ) having. Device according to Claim 23, characterized in that the two ferrite coil antennas ( 36 ) each with a capacitor ( 37 ) are connected in series. Device according to one of Claims 12 to 24, characterized in that the adjacent ferrite coil antennas ( 36 ) approximately parallel to the cap of the respective expansion rack ( 10 ) are arranged on this. Device according to one of Claims 12 to 25, characterized in that the longitudinal direction of the ferrite coil antennas ( 36 ) runs approximately transversely to the longitudinal direction. Device according to one of Claims 12 to 26, characterized in that the receiving unit ( 34 ) three mutually angled receiving coils ( 45 ) having. Device according to Claim 27, characterized in that the three receiver coils ( 45 ) a receiving unit ( 34 ) are arranged at right angles to each other. Device according to one of Claims 12 to 28, characterized in that the transponder device ( 32 ) a receiving device ( 40 ) and a transmitting element ( 42 ), which upon receipt of the from the transmitting unit ( 33 ) emitted signal ( 38 ) by the receiving device ( 40 ) is activated by this. Device according to one of Claims 12 to 29, characterized in that the receiving device ( 40 ) three angularly arranged individual receiver ( 41 ) having. Device according to Claim 30, characterized in that the individual receivers ( 41 ) are aligned at right angles to each other. Device according to one of Claims 12 to 31, characterized in that the ferrite coil antennas ( 36 ) of the transmitting unit ( 33 ) are operated at a frequency between 7 and 11 kHz. Device according to claim 32, characterized in that that the frequency is 9 kHz. Device according to one of Claims 12 to 33, characterized in that the ferrite coil antennas ( 36 ) at a distance of between 100 and 180 mm from each other on the support frame ( 10 ) are arranged. Device according to Claim 34, characterized that the distance is between 120 and 150 mm. Device according to one of Claims 12 to 34, characterized in that the signal transmitted by the activated transmission element ( 33 ) of the transponder device ( 32 ) is preferably output at a frequency between 1.5 and 2.5 MHz.