JPS6342492A - Horizontal position detector for underground drilling machine - Google Patents

Abstract

PURPOSE:To accurately measure a position by arranging a receiving coil group so that one side of a regular triangle is at the front part of a carriage and a vertex is at the rear part, and arranging display devices corresponding to the respective receiving coils at the respective vertexes of the triangle. CONSTITUTION:Left and right front receiving coils 7 and 8 are provided on the left and right sides of the front part of a main carriage 2, a rear receiving coil 9 is provided in the center of the rear part of the main body; 2, and those coils 7, 8, and 9 are at the vertexes of the triangle. A pilot lamp 11 corresponding to the coil 9 is provided in the center of the front side of a display box 10, a pilot lamp 13 corresponding to the coil 7 is provided at the rear left side of the box 10, and a pilot lamp 12 corresponding to the coil 8 is provided at the rear right part of the box 10; and the corresponding coils 9, 7, and 8 and lamps 11, 13, and 12 are connected mutually through signal lines 16, 15, and 14. Consequently, the coils 7, 8 and 9 are placed away from metallic components in the carriage to reduce the influence of the strain of a signal magnetic field upon a reception level, so the accurate position can be measured.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is applicable to small-diameter power cables, gas pipes, water pipes, etc.
1t - In construction work using a small-diameter underground excavator for underground burial without excavation, the underground position of the small-diameter underground excavator is measured in order to accurately carry out management facilities along the construction plan line. This invention relates to a horizontal position detection device.

Conventional technology Three receiving coils 2' are installed in a truck 1r that moves on the ground.
One of 3' and 4' is in front of trolley 1', the other two
90 Problems to be Solved by the Invention The wheel of the truck is arranged at the rear of the truck 1' and moves in the direction of the receiving coil that has the maximum reception level. This part has no choice but to be made of metal due to its strength. However, the signal magnetic field is distorted near the metal parts, making it impossible to perform accurate position measurements.

OBJECTS OF THE INVENTION The present invention was developed in view of the above-mentioned circumstances, and the seventh object is to keep the receiving coil away from the metal parts (rear wheel part) inside the car so that the distortion of the signal magnetic field reaches the receiving level. It is an object of the present invention to provide a horizontal position detection device for an underground excavator, which can perform accurate position measurement while reducing the influence of the machine.

Ninth Means and Effects for Solving the Problems In order to achieve the above object, the present invention aims to transmit an alternating current magnetic field generated from a vertically oriented transmitting coil inside an underground excavator into a trolley inside a truck moving on the ground. In a horizontal position measurement system that detects a point directly above a transmitting coil by using a plurality of receiving coils, three receiving coils are provided in the bogie at each vertex of an equilateral triangle, and the front of one bogie is The receiving coil groups are arranged so that one side of the equilateral triangle has an apex at the rear, and the bogie is provided with an indicator corresponding to each receiving coil on each apex of the triangle in the traveling direction of the bogie. They are arranged so that the vertices of the triangle are located in a nine configuration.

Then, we decided to move the receiving coil away from the metal parts (rear wheel part) inside one bogie to reduce the effect of distortion of the signal magnetic field on the reception level. This will be explained based on FIG. 1 in the blade surface is a trolley, 1 trolley 1 is a trolley body 2
A center shaft 3 is provided at the center of the front side of the truck body 2, and brackets 4 are fixedly installed on the left and right sides of the rear side of the truck body 2. A rear wheel 6 is provided on the axle 5.

Front left and right receiving coils 7.8 are provided on the left and right front sides of the bogie body 20, and a rear receiving coil 9 is provided at the center of the rear side of the bogie body 2, and these reception coils Coils 7, g, and 9 form the vertices of an equilateral triangle.

10 in the drawing is a display box, and jin's display box 1
In the center of the front side of 0 is an indicator lamp 1 corresponding to the receiving coil 9.
1, on the rear side of the display box 10 there is an indicator lamp 13 corresponding to the front side receiving coil 7, and further on the rear side of the display box 10 there is an indicator lamp corresponding to the front side receiving coil 8. 12 are provided respectively. And mutually corresponding receiving coils 9, 7.8 and display rungs 1], 13, 1
2 is signal line +4t 15. It is connected via +6.

FIG. 3 shows a logic circuit that compares the reception levels and lights up the indicator lamp corresponding to the reception coil with the minimum reception level. This logic circuit is the first one. 2nd and 3rd comparators 17. I
L I'? and No.].

The second NOT circuit 20, 21, the zero circuit 22, and the first NOT circuit 20, 21. It is composed of second AND circuits 23 and 24. One input side of the first comparator 17 is connected to the receiving coil 9, and the other input side is connected to the receiving coil 8. One input side of the second comparator 1g is connected to the receiving coil 8. The other input side is connected to the receiving coil 7, and one input side of the third comparator 19 is connected to the receiving coil 9, and the other input side is connected to the receiving coil 7, respectively.

One input side of the OR circuit 22 is connected to the input side of the first comparator 17, and the other input side is connected to the third comparator 1.
9, respectively.

t2 The output side of the second comparator 17 is connected to the input side of the first NOT circuit 20.

One input side of the first AND circuit 23 is connected to the first NO
One input side of the second AND circuit 24 is connected to the output side of the T circuit 20 and the other input side is connected to the output side of the first comparator 17.
The output side of g and the other input side are respectively connected to the output side of the third comparator f9.

The output side of the OR circuit 22 is connected to the receiving coil 11 via the second NOT circuit 21 and is connected to the first AND circuit.
The output side of the circuit 23 is connected to the receiving coil 13 with i±second AN
The output sides of the D circuits 24 are connected to the receiving coils 12, respectively.

In the logic circuit configured as described above.

Among the receiving coils 7, 8, 9, the indicator lamp with the lowest reception level +2.13. A high level H is output only to II, and a low level L is output to the other two.

Next, the process of determining the above logic circuit will be explained.

Let the outputs of the three receiving coils 9.8.7 be λt BeC, and the first. Second. Assuming that the outputs of the third comparator 17゜18.19 are a, b, and c (see Figure 4), the relationship between the order of magnitude of outputs A, B, and C and outputs a, b, and c is shown in Table 1. become that way.

Table 1 From the above relationships, create a circuit that corresponds to the lowest output among outputs A, B, and C and outputs a high level H only next time.

Let the final output be Xe)'sZ.

X-AC-person+C -ab z-b( Therefore, the logic circuit becomes K as shown in FIG.

By combining Figures 4 and 5, 3 pieces17)
The high level A/H is outputted to one of the output terminals (Xe7t'') corresponding to the lowest level L among the receiving coils B, C, and B.

As shown in FIG. 6, a light emitting diode LBD as an indicator lamp and a transistor Tr are connected to the output
If i is connected, a high level H is output and only t sets of light emitting diodes LED emit light.

There is a vertically oriented transmitting coil (not shown) inside the small diameter underground excavator, and a receiving coil 7 of the trolley 1 that moves the alternating current magnetic field generated by the transmitting coil on the ground.
L9 received.

(by the logic circuit) the indicator lamp corresponding to the receiving coil with the lowest receiving level is turned on.

The above receiving coil? , L 9 by placing two of them at the front and one at the rear of the truck 1.

The receiving coil 7.8 is moved away from the metal parts inside the trolley 1 to reduce the influence of signal magnetic field distortion on the receiving level.
The arrangement of the indicator lamps 11°, 12, and 13 at this ninth point is made as described above.

Therefore, for example, when the reception level of the rear side receiving coil 9 is the lowest, the truck 1 is positioned further back than the small-diameter underground excavator, and the indicator lamp II lights up. At this ninth point, the cart 1 should be moved in the direction of the lit display rung 11, that is, in the forward direction.

In this way, the horizontal position of the small diameter underground excavator is detected.

Effects of the Invention As detailed above, the horizontal position detection device for an excavator according to the present invention uses an alternating current magnetic field generated from a vertically oriented transmitting coil in an underground excavator to detect In a horizontal position measurement system that receives data using a plurality of receiving coils and searches a point directly above a transmitting coil, three receiving coils are provided in the truck so as to be located on each vertex of a full equilateral triangle.

Receiving coil groups are arranged so that one side of the equilateral triangle is at the front of the cart and the apex is at the rear, and a display device corresponding to each receiving coil is placed on each vertex of the triangle on the cart. 1 is arranged so that the apex of the triangle is located in the traveling direction of the triangle.

As a precaution, the receiving coil was arranged so that one side of the equilateral triangle formed by the receiving coil was at the front of the bogie, and the apex of the equilateral triangle was at the rear of the bogie. By moving the receiving coil further away from the ring part), the influence of distortion of the signal magnetic field on the reception level can be reduced, and accurate position measurement can be performed. In addition, a display corresponding to each receiving coil is provided on each vertex of the triangle, and the vertex of the triangle is positioned in the traveling direction of the truck, so that the display for moving one truck from t can be easily seen.

Brief Explanation of 4 Capabilities Figure 1 is a partially omitted flat diagram of one embodiment of the present invention, Figure 2 is an explanatory diagram of the correspondence between the receiving coil and the display rung, and Figure 3 is a diagram illustrating the correspondence between the receiving coil and the display rung.
Figures 4 and 5 are explanatory diagrams of the configuration of the logic circuit, Figure 6 is an explanatory diagram of the configuration of the display circuit, the seventh cause is a side view of a conventional horizontal position detection device for an underground excavator, and Figure 8 is the same plan view.

1 is the truck, 2 is the truck body, 7, 8.9 is the receiving coil%
II, 12.13 is an indicator lamp.

Claims (1)

[Claims] In a horizontal position measurement system, the alternating current magnetic field generated by a vertically oriented transmitting coil inside an underground excavator is received by multiple receiving coils in a moving vehicle on the ground, and the position directly above the transmitting coil is searched. Three receiving coils are installed in the car so that they are located on each vertex of an equilateral triangle, and the receiving coil groups are arranged so that one side of the equilateral triangle is at the front of the truck and the apex is at the rear. 1. A horizontal position detection device for an underground excavator, characterized in that a display device corresponding to a receiving coil is provided on each vertex of a triangle, and is arranged so that the vertex of the triangle is located in the traveling direction of the truck.