DE3214758C2 - Equipment for gas sampling in mine workings - Google Patents

Abstract

The invention enables gas sampling with the aid of a wet analysis probe at inaccessible probing locations in mine workings. A wet analysis probe bottle (2) is inserted into a basket-shaped carrier device (3) and suspended from a supply and control line (4) and lowered to the probing location. A solenoid valve (30) arranged in the carrier device (3) is actuated by a remote control unit (6) and opens the outlet opening of the probe bottle (2). A timer in the control unit (6) closes the drain opening via the solenoid valve after a predetermined time, in which the liquid has completely drained from the container (2) and the sample medium has flowed through a probe inlet line into the probe chamber. The inlet opening of the probe bottle (2) is blocked by a non-return valve to prevent the sample medium from flowing back.

Description

3 4

Keeps a distance that interrupts a predetermined signal hold time in the carrier device Inflow of the control device located at the operating location, away from the inlet connection of the probe container, a further valve is arranged around the drainage of the liquid from the probe container, with which a return flow is triggered; the end of the sampling process of the probe chamber to the environment can be prevented, takes place automatically with the aid of the control device by the carrier device closing the power-operated shut-off element on a holding device.
The signal transmission arrangement is preferably a common control point can be raised and lowered A Si- can claim that in addition to the signal signal transmission arrangement with the power-operated and remote energy transmission, it is also connected to the function of the me shut-off valve and can take over its switching state mechanical holding device,
With the invention, the possible uses of the liquid discharge bottle, which have proven themselves as a wet analysis probe in pit operations and the wet analysis probes, are also accessible and / or particularly hazardous benbuildings according to the types of protection due to their intended use in pit operations (Sch) s and (Sch) i probing locations expanded The laboratory equipment used for evaluating the gas-conveying The electrical energy transmission, controllable sample medium and actuation of the power-operated shut-off device must therefore not be changed or adapted in any way. This is usually the simplest and most straightforward solution. Radius of action between the accessible control device Within the scope of the inventive concept, however, both the supply and the control of the force-wide limits can be set for the remote and inaccessible probe location, namely by actuating the shut-off device by pressure medium and by means of the mechanical holding device and the control device Pressure medium lines take place. In addition, if possible, an electrical one used for remote control is borrowed, with a separate cable in the carrier device of the probe. safe energy source and about those in the

Signal transmission connections designed as lines for sampling in inaccessible probing locations

If the liquid-filled probe container is initially OK, only a control signal to control the input

the carrier device is inserted and connected to the cold pre-30 and switch-off sequences of the power-operated locking member

Send to the probing site, hanging downwards.

after the drain opening on the bottom of the container to the following is an embodiment of the invention

opened by remote actuation and explained in more detail after a preliminary with reference to the drawing

set time in which the liquid shows completely out of the drawing

Container has expired, also closed remotely- 35 F i g. 1 is a general view of an embodiment

sen. Due to the suction effect of the draining liquid play of the device according to the invention for gas pro-

is the gaseous sample medium ir.

the interior space is sucked in, and finally the girders are built with a

device with the container for accessible operation to the probing location lowerable wet anilysis probe,

office raised. With the help of the conventional 40 a winding drum for receiving and outputting the

Shut-off cocks provided are conduit and an electrical control unit with which

all container openings closed. The container is used to control the wet analysis probe for sampling

can be removed from the connections on the carrier device;

separates and from the carrier device for the analysis of the F i g. 2 a schematic view of the wet analysis

Taken from the sample medium. This sampling cycle 45 sensor with carrier device and in this exchange

k! us can, when using a new, liquid-filled, self-tapping and impact-protected probe bottle:

Wet analysis container in the carrier device again and

be picked up. Mixing of the gaseous Pro- F i g. 3 an electrical circuit diagram of the

benmediums with the draining liquid finds the written embodiment used electrical

basically does not take place, so that even without visual contact 50 see control unit with supply and control current

at the inaccessible probing location a reliable and circular to one arranged in the wet analysis probe

accurate sampling is guaranteed. Magnetic valve.

In the inlet path to the inlet connection of the probe container, the inlet shown in Fig. 1 with all the components

Furthermore, a pressure relief valve is preferably arranged, suitable for taking gas samples at inaccessible sun

the inflow path in the case of overpressure in the interior of the tank consists of the following

in relation to the ambient atmosphere, the main components include: one as a whole with 1

In this way, even without a manually or remotely operated wet analysis probe, with which a conventional probe bottle

te shut-off of the inlet path of the container interior see 2 is releasably held in a support frame 3; one

closed after completion of the sampling, while mechanically on the probe side with the carrier device

the suction of the gas sample at negative pressure in the 60 device 3 and electrically connected to a shut-off valve

The interior of the container is not obstructed. those power supply and control line 4, which over

A major simplification the remote control has sufficient mechanical tensile strength to maintain the

of the power operated shut-off valve results in Wei tensile forces when lowering and pulling up the

formation of the invention characterized in that the control unit to transmit probe 1; a take-up roll for pre-

a switch that can be activated by hand, and for winding up the supply and control

contains a timer that is activated when a cable 4; and one on the output side through a plug-in

Power-operated shut-off device via the signal transmission connection with the supply and control cable 4

triggers the opening signal and after a connected control unit 6, which has its own operating

IT /

Contains voltage source and is provided with a manually operated double switch 7 for triggering and remote control of the sampling process. To the Control units are also various externally visible light displays 8, 9 and 10 for monitoring the operating power supply, and provided to display the operating status of the control unit.

The operating power source as well as all elements involved in the power supply and electrical control are designed to be intrinsically safe; the housing parts and connector plugs as well as those usually made of steel produced carrier device 3 are in the described embodiment on the shield of the Supply and control cables 4 connected to one another.

The design of the wet analysis probe 1 can be seen most clearly from the schematic illustration in FIG F i g. 2 to which reference is made below. The probe container 2 is in the embodiment described as a Sonuenfiasche from Gias trained as it has already been used for the usual wet analysis in accessible rooms. the Probe bottle 2 has an approximately cylindrical chamber 20 which is arched in the shape of a dome at the two axial ends to take up the liquid or, after it has been drained, to take up the gaseous sample medium. the Probe bottle 2 each has an upper inlet connection 21 and a lower outlet connection 22, which are at the top or axially connect to the receiving chamber 20 at the bottom. In each of the two connecting pieces 21 and 22 there is a manually operated shut-off device in the form of a cock 23 or 24 ground into a seat

The inlet nozzle 21 is connected via a rubber hose or a rubber sleeve to a check valve 25 which is installed in such a way that it is permeable for an inflow from the ambient atmosphere to the inlet nozzle 21 or to the receiving chamber 20, in ucf opposite rviCiitüHg, aiSo wc » one opposite the Ambient atmosphere, however, higher internal pressure in the receiving chamber 20 is impermeable. The drain port 22 is connected via a hose connection 26 to a power-operated shut-off device in the form of a solenoid valve 30 which, when not actuated, closes a drainage path for both the liquid in the probe bottle 2 and for the sample medium and only opens this drainage path when it is actuated

In the illustrated embodiment, the carrier device 3 is a cage-like one that is open on all sides Steel wire frame formed, whose longitudinal wire webs to the centrally arranged probe bottle 2 Have sufficient distance to the shock-sensitive glass bottle 2 from direct contact and impact protect external obstacles. On the underside, the carrier device 3 is supported by a base plate 31 (Fig. 1) completed on which the solenoid valve 30 is attached and through which the solenoid valve following The drainage opening for the discharge of the probe liquid leads two spaced apart, frame-mounted retaining brackets, each consisting of two approximately radially extending support troughs and a retaining ring can exist, hold the probe bottle 2 below and above the receiving chamber 20, the lower Console 32 supports the receiving chamber 20 of the probe bottle 2 via a suitable support ring, not shown in the drawing, and the upper bracket 33 holds the probe bottle 2 in the desired position, aligned on the axis, by engaging the inlet connector 21 34 of the support frame 3. The support and retaining rings preferably only extend over a partial circle so that the probe bottle 2 can be released approximately radially from the support device 3 after releasing a securing mechanism and slightly lifting it from the operating position shown. Before removing the bottle 2 , the hose connection 26 to the solenoid valve 30 permanently installed on the support frame must first be loosened.

The cable 4, which in the illustrated embodiment, in addition to the power supply and control of the solenoid valve 30, also serves as a pull cable for holding the carrier device 3 with the built-in probe bottle 2, i.e. the weight of the probe 1 when Lowering and raising r. Has to be transferred to the control point, is with the help of a in F i g. 2 only schematically plug 41 shown connected to the probe 1 and mechanically connected to the via a strain relief 42 Support device 3 connected. A two-wire elec Irish line 43, uic at a LäPigSäicg ücS carrier frame 3 is set for example by suitable clamps, connects the connector 41 with the solenoid valve 30 arranged at the bottom. In Fig. 3 is the electrical circuit of the described an exemplary embodiment of the device for In the following, however, only those subcircuits and components of the in Fig. 3 entered overall arrangement, which are important for div-invention.

The circuit parts arranged in the control unit 6 are shown in the dashed circuit block 6 Solenoid valve 30 is connected to output connections 61 via the two-wire supply and control line 4 of the control unit 6 connected.

An operating current source shown in block 62 is used for power supply, which in the illustrated embodiment consists of a device with a limiting resistor.

supply battery exists. A manually operated on-off Switch 63 serves as an operating switch and switches that Control device 6 to the integrated operating power source 32. A monitoring circuit shown in block 64 is used to monitor the voltage supplied by the operating current source 62. If this tension sinks below From a predetermined threshold value, a light-emitting diode lights up, which is visible as a display 8 through a viewing window in the completely closed sheet steel housing of the control device 6 if there is sufficient operating voltage on the operating power lines a and b to actuate the solenoid valve 30. The circuit via lines a and b is, however, before the actual control part of control unit 6 is triggered (by pressing down of the double switch 7) interrupted by a normally open contact 65a which can be actuated by the relay 65.

When the operating switch 63 is on, the relay 65 is energized by a timing circuit 66 for a preset time one timer / C67 and one the time constant of the / C67 determining circuit arrangement, the time constant being adjustable via a trimming resistor 68. The timing circuit is connected as a monostable multivibrator (monoflop), which when triggered by closing the two switches 7 arranged in series at the input circuit of the / C67, the level at output 69 changes Output 69 is activated after double switch 7

7 8

Maintained by the timing circuit according to the pre-1 by inserting a time set for example with distilled, regardless of the water-filled probe bottle 2 in the holder in how long the double switch 7 is inserted at the beginning of the carrier device 3 and pressed on the inlet side with triggering has been. The hose 26, which was created in the unstable connection to the check valve 25 on the outlet side via the position of the monoflop 66 on the output line 69, is connected to the solenoid valve 30. The high potential that is wound up is applied via base resistors to the probe 1 from the control point to the bases of three parallel-connected transistors 70, the tensile load-absorbing supply and 71 and 72. The two transistors 70 and 72 control line 4 are lowered to ensure that one is npj * Transistors and the transistor 71 is a pnp- constant equipotential bonding, it is advisable to use the transistor. In the unstable state, the transistors 70 and 72 will pass through the relatively long line strand on the route bottom of the monoflop 66 tipping over. As soon as the probing point reached with the probe 1 is controlled, while the previously controlled pnp- is, the control device 6 is blocked by plugging in the Stek transistor 71 via the base electrode. Da- kers 11 in a corresponding socket in the housing is connected immediately after the triggering of the monoflop 66 of the control device, whereby by actuating the double switch 7, the two wires located in the collector 15 of the supply and control line 4 with the gate circuit of the transistor 71, The two output connections 61 of the control unit 6 that were previously illuminated and the green light-emitting diode 9 are extinguished while the two are electrically connected. Thereafter, the transistors 70 and 72 are switched on at the same moment, and the control unit switch 63 turns on, and on the one hand the relay 65 and the other green light-emitting diode 9 shows the operational readiness of the 10 excitement. The LED 10 20 device on. The Doppcischüiicr 7 is then for triggering is controlled in phase with the relay 65. Sampling activated, whereupon the monoflop and indicates that the circuit a-b via the relay 66 as a timer circuit of the relay 65 for a pre-contact 65a to the solenoid valve 30 is closed and the given period of time is excited and the relay contact 65a closes the sampling by opening the flow of the son. The solenoid valve 30 is energized and opens the bottle 2 via the solenoid valve 30 takes place. The 25 the drainage path through the drain port 22 of the probe light-emitting diode 10 is to distinguish it from the green bottle 2. At the end of the preset time, the liquid light-emitting diode 9 is designed as a red light-emitting diode and liquid has completely leaked from the probe bottle 2 F i g. 1 through a window in the housing and the receiving chamber 20 with the sample medium, se of the control device 6 is visible. The light-emitting diodes 9 and that is to say a sample of the ambient atmosphere of the probe 10 therefore show the respective operating state of the 30 filled. Due to the de-energization of the relay 65 and the control unit or the remote-controlled probe 1 on. open the operating circuit for the solenoid valve

Wit said above, is the time constant of the monoflop 30, the latter closes the drainage path. The red light-emitting diode 10, which shines during the 66 so that the actuation time of the magnetic sampling goes out, valve 30 for a closed valve contact 65a and the green light-emitting diode 9 lights up. The probe 1 completely drains off the liquid in the receiving chamber 20 35 can then be pulled up again to the control point at the beginning of the sampling. At the control point, the probe bottle is sufficient.After the preset time has elapsed, the two taps 23 and 24 tilt the monoflop 66 back into the stable state, pressed by the check valve 25 and the hose 26, the potential on the output line 69 is released and removed from the carrier device 3, lower level, disables the transistors 70 and 72, 40 Optionally, so after further sampling deenergizes the relay 65 and opens the operating using additional probe bottles 2 in derselstromkreis a- b 30 to the solenoid valve is thereby ben Way to be made.

the drainage path of the probe bottle 2 is closed and the

Inflow to the receiving chamber 20 is interrupted. For this 2 sheets of drawings

Drainage of sample medium from the chamber interior 45

The space through the inlet connection is blocked by the check valve 25 and the sample medium is enclosed in the receiving chamber 20. Simultaneously with the
Interruption of the relay circuit via the transistor 70, the pnp transistor 71 is current-permeable and so
closes the circuit via the green light-emitting diode 9.
This gives the operator the information
that the sampling is completed and the operating switch 63 can be turned off.

Of course, instead of the non-return valve, 55
tils 25 also a second remote-controlled shut-off device,
z. B. a second solenoid valve with the inlet port 21
be connected, which opens and closes the inlet path to the receiving chamber 20 synchronously with the actuating movement of the solenoid valve 30 and via the line 4 eo
is controlled in parallel with the solenoid valve 30. However, the use of a check valve 25 in the feed line is simpler and cheaper.

Sampling at inaccessible probing locations
takes place with the device described above as in 65
follows

In an accessible place on the track sole,
hereinafter referred to as the operating point, the probe

Claims (8)

1 2 61, b) via a switch designed as a normally open contact: the (65a) is connected to an operating power source (62) and the normally open contact is connected to the timer (66) 1. Device for gas sampling in pits is controllable build, with a gas-tight lockable wet analysis 5 9. Device according to one of claims 3 to 8, sensor container, characterized in its inlet and outlet nozzles that the control device (6) with manually operated shut-off devices are installed, an operating power source (62) in a closed characterized in that the probe is arranged sheet steel housing that on the container (2) in a cage or basket-shaped tray output (69) of the timer (66) a control circuit (65, device (3) is detachably held, which the IO 70) to control the switching state of the power actuator The probe container is surrounded on all sides and protects against the shut-off valve (30) and two circuits Bump against external obstacles on Ab- (71, 72) to control the operating state withstands that in the carrier device one of the control unit (6) characterizing displays (9, a power-operated shut-off valve (30) closable 10) are switched on and that the two displays The drain line is connected to the drain 15 (9, 10) through a window in the sheet steel housing from the outside. nozzles (22) of the probe container (2) are detachably connected and visibly arranged,
the is that in the inlet path to the inlet port (21) of the Probe container another valve (25) is arranged with which a return flow from the probe chamber (20) to the environment can be prevented that the carrier 20 device fi) held on a holding device (4) The invention relates to a device for th and about the holding device of a gas sampling in pits, with a gas-tight common control point from liftable and lowerable lockable wet analysis probe container, in its and that a manually operated shut-off device at the remote control point arranged control device (6) for remote control 25 ne are installed. Via a signal transmission arrangement (4) with the conventional wet analysis probes, as used for gas power-operated shut-off valve (30) is connected to sampling are used in mine workings and its switching status controls probe bottles made of glass, each in a feed and 2. Device according to claim 1, characterized in the discharge nozzle manually operated shut-off devices in the form draws that the have in the inlet path to the inlet connection 30 of ground cock plugs. The two (21) of the probe container (2) arranged further taps are at the probing location by a control valve an overpressure valve (25) opens the inlet and the liquid path flowing downwards if there is overpressure in the container (20), there is a negative pressure in the interior of the bottle The ambient atmosphere precludes the gaseous sample medium at the probe location 3. Device according to one of claims 1 or 2, 35 sucking in After the liquid has drained and sucked in characterized in that the control device (6) of the sample medium, both taps of the probing πεη by means of a manually operated switch (7), one bottle is again closed by hand and the one that can be switched on The timer (66) contains the gas sample that is analyzed in a laboratory when it is switched on The power-operated shut-off device (30) opens conventional procedure and wet analysis probe triggers the signal and after a presettable 40 assumes that the probing of which the probe ren signal hold time interrupts operating personnel can be reached. The pro- 4. Device according to claim 3, characterized in that it is marked at inaccessible probing locations, e.g. Am draws that for setting the switching duration of the large boreholes, blind shafts and their swamps Timer (66) a time constant circuit with ei- was on the other hand with the known wet analysis probe nem variable resistor (68) provided 45 is not possible. 5. Device according to claim 3 or 4, characterized This is also marked with that of US-PS 41 54 794, that the power-operated shut-off gas detector is not possible. This gas detector is a solenoid valve (30), which in unactuated gate has a manually compressible sample state in the closed position, the container is open at the start of the examination 6. Device according to one of claims 3 to 5, 50 gangs partially filled with indicator liquid is through characterized in that to avoid repeated compression and relaxation of the unintentional switching on of the timer (66) two containers, the gas to be examined is over one Push button switch (7) with an electrically in series valve arrangement through the indicator liquid into the Switched switch contacts provided as on / off switch- container sucked in and a color change of the indicators are. 55 gate liquid observed. This gas detector requires 7. Device according to one of claims 3 to 6, so also an operator at the probing site, which is characterized in that the supply and container wall operated in the manner of a bellows pump
The invention is based on the object of providing a single electrical cable (4) on a cable flow direction which the sampling mel (5) can be wound up through a plug connection 60 with the aid of a wet analysis probe special (11) connected to the control unit (6) and allows extra effort for the probe operation even on inaccessible sides via a strain relief (42) with the carrier probing locations. device (3) coupled and connected via a plug-in connector (41) electrically assigned to the solenoid valve (30), the invention provides for solving this constraint is. 65 would specify that the probe container in a cage or 8. Device according to claim 7, characterized in that the carrier device in the form of a basket is detachably held, characterized in that the electrical cable has an intrinsic safety which surrounds the probe container on all sides and is connected to an output circuit (a, 65a, protection against collision) external obstacles