JPH0715502B2 - Explosion-proof azimuth measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof device when an orientation measuring device is used in an explosion-proof area such as a tunnel where a combustible gas may be generated.

[0002]

2. Description of the Related Art A gyro compass that uses electricity cannot be used when measuring direction in an explosion-proof area such as a tunnel where there is a risk of generating flammable gas, because it may explode or ignite. It was done using a manual surveying instrument.

[0003]

However, in recent years, there has been a great demand for automation of tunnel construction and robotization. Therefore, it is necessary to automatically and continuously measure the direction using a gyro compass or the like.

It is possible to use the gyro compass even in the explosion-proof area if it is housed in a closed explosion-proof container. There was a risk that it would interfere with the operation of the compass.

In view of the above problems, it is an object of the present invention to prevent the temperature of an explosion-proof container housing a measuring device from rising and to enable automatic orientation measurement in an explosion-proof area.

[0006]

According to the present invention, an azimuth detecting mechanism is sealed in a container having an internal pressure explosion-proof structure and disposed in an explosion-proof area.
An air supply pipe and an exhaust pipe are connected to the internal pressure explosion-proof container, a blower for blowing air to the air supply pipe and an opening of the exhaust pipe are provided in a non-explosion-proof area, and a cooling mechanism for cooling the air blown by the blower is provided.

[0007]

The cool air sent to the air supply pipe by the blower and the cooling mechanism passes through the internal pressure explosion-proof container and is discharged from the opening of the exhaust pipe into the non-explosion-proof area. This cold air cools the orientation detection mechanism in the internal pressure explosion-proof structure container, and releases the heat generated by the orientation detection mechanism to the non-explosion-proof area.

[0008]

1 to 3 show an embodiment of the present invention.

FIG. 1 shows a schematic section inside the tunnel 1, in which an explosion-proof area 2 is set near the face and a non-explosion-proof area 3 is provided at the rear.

A shield machine (not shown) for advancing while excavating a face is arranged in the explosion-proof area 2, and a gyro compass as an azimuth detecting mechanism is attached to the shield machine in a sealed state in a container 4 having an internal pressure explosion-proof structure. .

An air supply pipe 5 and an exhaust pipe 6 arranged along the tunnel 1 are connected to the container 4. Air supply pipe 5 and exhaust pipe 6
Is connected to a monitoring device 7 located in the rear non-explosion proof area 3. The monitoring device 7 is mounted on a trolley (not shown) located in the non-explosion proof area 3 in connection with the shield machine.

As shown in FIG. 2, the monitoring device 7 has an air supply pipe 5
To the blower cooling device 8, a valve 9 for adjusting the flow rate of the blown air, a flow meter 10 for measuring and displaying the flow rate of the blower valve 9, and an exhaust gas opening in the non-explosion proof area An exhaust port 11 of the pipe 6 and an exhaust valve 12 for adjusting the flow rate of the exhaust pipe 6 are provided.

The blower cooling device 8 includes an air filter 14, a blower (blower) 15, and an air cooler 16 as shown in FIG.
And the air tank 17 are connected in series.

The air cooler 16 is one in which air blown from the blower 15 is passed inside the inner pipe of a double-structured pipe, and cooling water is guided between the inner pipe and the outer pipe. An inlet 20A and an outlet 20B of cooling water are provided.

The air tank 17 is for temporarily storing cooled air, and is provided with a drain 21 for discharging condensed water inside by condensation.

The blower cooling device 8 thus constructed is mounted on the carriage in the non-explosion proof area 3 together with the monitoring device 7.

Further, as shown in the figure, a pressure gauge 13 is attached to the connecting portion of the exhaust pipe 6 of the container 4, and a display unit 13A for displaying the detected pressure is provided in the monitoring device 7.

Reference numeral 14 is a pressure switch for cutting off the power supply of the gyro compass when the pressure inside the explosion-proof container 4 rises above a certain level for some reason.

Next, the operation will be described.

Air outlet 1 when using a gyro compass
By operating the blast cooling device 8 connected to 5, cooling air is sent from the intake pipe 5 into the container 4 via the air supply valve 9, and at the same time, the air in the container 4 is exhausted into the non-explosion-proof area 3 by the exhaust pipe 6. To discharge.

The pressure and temperature of the air in the container 4 are controlled by adjusting the opening degree of the air feeding valve 9 and the exhaust valve 12 and the cooling water flow rate of the air cooler 16.

That is, the air supply valve 9 and the exhaust valve 12
The flow rate of the air passing through the container 4 is increased by widening the opening of the container 4, and the heat generated by the gyrocompass in the container 4 is actively released to the non-explosion-proof area 3 by a large amount of the discharged air. descend. In addition, the air cooler 16
The blast temperature is adjusted by increasing or decreasing the flow rate of the cooling water.

In this way, the inside of the container 4 is maintained at a temperature suitable for the operation of the gyrocompass and at a substantially constant pressure higher than the outside air by operating the air supply valve 9 and the exhaust valve 12. Therefore, the gyro compass stably operates under sufficient explosion-proof conditions, and the azimuth measurement in the explosion-proof area 2 can be performed safely and automatically.

The explosion-proof area 2 moves forward as the shield machine advances, and the rear non-explosion-proof area 3 expands forward accordingly, but the container 4 becomes a shield machine.
Since the monitoring device 7 and the blast cooling device 8 are respectively mounted on the bogie connected to the rear of the shield machine, they move as the excavation work progresses, and the gyro compass continuously detects the direction.

[0025]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a container having an internal pressure explosion-proof structure in which an azimuth detecting mechanism is housed is arranged in an explosion-proof area, and a blower for sending air to the container and connecting an exhaust pipe to the blower pipe and exhaust gas Since the opening of the pipe and the non-explosion-proof area are arranged, and the cooling mechanism that cools the air blow by the blower is provided, the cool air sent into the container via the air blow pipe by the blower and the cooling mechanism cools the direction detection mechanism. However, the heat generated by the azimuth detecting mechanism is released to the non-explosion proof area to prevent the temperature inside the container from rising.

Therefore, even in the explosion-proof area, it is possible to detect the azimuth automatically and continuously by using the azimuth detecting mechanism such as a gyro compass.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view of the inside of a tunnel during excavation showing the arrangement of an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an explosion-proof type azimuth measuring device for explaining the flow of air.

FIG. 3 is a block diagram showing a configuration of a blower cooling device.

[Explanation of symbols]

 2 Explosion-proof area 3 Non-explosion-proof area 4 Container 5 Air pipe 6 Exhaust pipe 8 Air cooling device 15 Blower 16 Air cooler

Claims (1)

[Claims] 1. An air blower and an exhaust pipe for blowing air to an air supply pipe, wherein an azimuth detecting mechanism is sealed in a container having an internal pressure explosion proof structure and arranged in an explosion proof zone, and an air blow pipe and an exhaust pipe are connected to this internal pressure explosion proof structure container. And an opening part of the explosion-proof area are provided in a non-explosion-proof area, and a cooling mechanism for cooling the air blown by the blower is provided.