JPH04108691U - Obstacle detection device for shield tunneling machine - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to prevent cutter bits from being damaged by obstacles by detecting obstacles in the face excavated by a shield excavator in advance. [Structure] In a shield excavator that excavates underground while rotating a cutter head 4 provided at the front of the shield body, obstacles 28 in the face are placed in front of the cutter head 4.
A detection bit 10 for detecting is provided so that its tip protrudes forward from the tip of the cutter bit 5, and an obstacle 28 in the face is detected from fluctuations in the load acting on the detection bit 10. As a result, when the detection bit 10 detects the obstacle 28, the rotation of the cutter head 4 is stopped and the obstacle 28 is dealt with, thereby preventing damage to the cutter bit 5 etc. caused by the obstacle 28. .

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to an obstacle detection device for a shield excavator that excavates a tunnel.

0002

[Conventional technology]

Conventional shield excavators that excavate tunnels are propelled underground using shield jacks. A cutter head rotated by a cutter head motor is attached to the front of the shield body being advanced. A pad is provided. In addition, a large number of cutter bits are attached to the front of the cutter head. As the head rotates, these cutter bits excavate the face in front of the shield body. The excavated earth and sand are transported to the front part of the shield body through the earth and sand intake port. After being taken into the chamber, it is ejected by the earth removal device, and is further removed from the rear of the shield body. It is configured to be transported to.

0003

[Problem that the idea aims to solve]

Conventional shield excavators such as those mentioned above run into obstacles such as bedrock while excavating. When the rotational torque of the cutter head increases the performance of the cutter head motor that drives it, In many cases, the cutter head was not noticed until the force was exceeded and the cutter head stopped. As a result, the cutter head motor may be damaged or the cutter bit may be damaged due to overload. There were some problems such as. This idea was made with the aim of improving the above-mentioned problems, and the obstacles in the face were Attempts to provide an obstacle detection device for shield tunneling machines that was previously able to detect It is something.

0004

[Means to solve the problem]

In order to achieve the above purpose, this idea has a cup installed at the front of the shield body. In a shield excavator that excavates underground while rotating the cutter head, the cutter A detection bit is installed on the front of the head to detect obstacles in the cutting face. In addition to protruding forward from the end, it is also possible to change the load acting on the detection bit. This system is designed to detect obstacles in the face from movement.

[Effect]

With the above configuration, when an obstacle is detected in the face, the rotation of the cutter head is stopped and the obstacle is detected. By disposing of harmful objects, the cutter bit may be damaged due to obstacles, or the cutter bit may be damaged. It is possible to prevent problems such as burnout of the head motor due to overload. Become so.

[0005]

【Example】

An embodiment of this invention will be described in detail with reference to the drawings. Figure 1 is a cross-sectional view of the shield tunneling machine, Figure 2 is a front view of the same, and Figure 3 is a detailed view of the obstacle detection device. A detailed drawing and FIG. 4 show the hydraulic circuit of the device. In these figures, 1 is a shield book propelled underground by a shield jack 2. It has a cutter head 4 rotated by a cutter head motor 3 in the front part. Ru. As shown in FIG. 2, a large number of cutter bits 5 are emitted from the front surface of the cutter head 4. These cutter bits 5 are attached as the cutter head 4 rotates. The face in front of the shield body 1 is excavated, and the excavated earth and sand are taken in. After being taken into the chamber 7 at the front of the shield body 1 through the opening 6, The injected muddy water is turned into a slurry, and the mud draining pipe 8 further drains the shield body 1. It is designed to be ejected to the rear.

[0006] On the other hand, on the front surface of the cutter head 4, as shown in Figs. Bit 10 is provided. As shown in Fig. 3, these detection bits 10 are approximately diamond-shaped, with the tip end It protrudes slightly forward from the distal end surface 11 of the cutter bit 4, and the proximal end is pinned. 12, the cutter head 4 is rotatably pivoted to the face plate 13 of the cutter head 4. Additionally, there is a detection bit between the base end of the detection bit 10 and the bracket 14 provided on the face plate 13. A hydraulic cylinder 15 is provided that expands and contracts when the kit 10 is rotated around a pin 12. , the pressure chambers 16 and 17 in this hydraulic cylinder 15 are connected to the hydraulic circuit shown in Fig. 4. . In other words, the pipe line 18 connected to each pressure chamber 16, 17 of the hydraulic cylinder 15 is connected to the cutter head. Connected to the pressure transmitter 21 and flow meter 22 via the rotary joint 20 provided on the rotating shaft 19 of 4. It is further connected to an electromagnetic switching valve 24 via a check valve 23. In addition, there is a check mark in the middle of the pipe connecting the rotary joint 20, the pressure transmitter 21, and the flow meter 22. A relief valve 26 is connected via a check valve 25.

[0007] Next, to explain the operation, the shield body 1 is pushed while rotating the cutter head 4. As shown in Figure 3, the cutting face is being excavated by the cutter bit 5 on the front of the cutter head 4. When the cutter bit 5 hits the obstacle 28, it protrudes forward from the tip surface 11 of the cutter bit 5. Detection bit 10 first collides with this obstacle 28, and the detection bit 10 is detected centering on pin 12 by the obstacle 28. Knowledge bit 10 is rotated. This shortens the hydraulic cylinder 15 and increases the oil pressure in the head side pressure chamber 17. Negative pressure is generated in the rod side pressure chamber 16.

[0008] When the oil pressure in the head side pressure chamber 17 rises, the pressure transmitter 21 shows the pressure shown in Figure 4. This pressure fluctuation is converted into an electrical signal and sent to the operator's room (not shown). ) to inform the operator that it has hit obstacle 28, and also to notify the operator that the head has hit the obstacle 28. When the oil pressure in the pressure chamber 17 exceeds the set pressure of the relief valve 26, the relief valve 26 releases the tank 29. will be relieved. Also, when negative pressure is generated in the rod side pressure chamber 16, oil is sucked up through the flow meter 22. As a result, the flow rate of the flowmeter 22 changes as shown in FIG.

[0009] This change in flow rate is converted into an electrical signal and sent to the operator's room. The meter detects pressure fluctuations sent from the pressure transmitter 21 and flow rate fluctuations sent from the flowmeter 22. By monitoring, the cutter bit 5 can detect when it has hit the obstacle 28 and starts digging. It will be possible to detect it before it occurs. Therefore, when the obstacle 28 is detected, the rotation of the cutter head 4 is stopped and this obstacle is detected. 28 will prevent damage to the cutter bit 5 and cutter head. This makes it possible to prevent the motor 3 from burning out. In the above embodiment, the pressure fluctuations in the pressure chambers 16 and 17 in the hydraulic cylinder 15 are The cutter head 4 is monitored and the cutter head 4 is stopped if an obstacle 28 is detected. , the cutter head 4 is automatically stopped by a signal from the pressure transmitter 21. Good too.

0010

[Effect of the idea]

As detailed above, this idea is designed to prevent obstacles such as bedrock from occurring during excavation by a shield excavator. If an obstacle is hit, the cutter bit detects this before digging, allowing it to move away from the obstacle. When the cutter head is detected, the cutter head is stopped and the obstacle is removed. The cutter bit may be damaged or the cutter head motor may be overloaded. This makes it possible to reliably prevent problems such as burnout of the head motor.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a shield tunneling machine that is an embodiment of the invention.

FIG. 2 is a front view of the shield tunneling machine.

FIG. 3 is a detailed diagram of the obstacle detection device.

FIG. 4 is a circuit diagram showing a hydraulic circuit of the device.

[Explanation of symbols]

1 Shield body 4 Cutter head 5 Cutter bit 10 detection bits 15 Hydraulic cylinder 16 Pressure chamber 17 Pressure chamber 28 Obstacles

Claims (2)

[Scope of utility model registration request] Claim 1: In a shield excavator that excavates underground while rotating a cutter head 4 provided at the front of a shield body 1, a detection bit 10 is provided in front of the cutter head 4 to detect obstacles in the face. An obstacle detection device for a shield excavator, which is provided with a tip protruding forward from the tip of the cutter bit 5, and detects an obstacle 28 in the face from fluctuations in the load acting on the detection bit 10. . 2. Obstacle detection according to claim 1, wherein a hydraulic cylinder 15 is connected to the detection bit 10, and the obstacle 28 is detected by pressure fluctuations in pressure chambers 16 and 17 within the hydraulic cylinder 15. Device.