JP3588068B2 - Roller cutter wear detector - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wear detection device for detecting a wear state of a roller cutter provided on a cutter head of a tunnel excavator.
[0002]
[Prior art]
BACKGROUND ART Conventionally, a tunnel excavator that excavates a hard rock layer such as a bedrock (in the present invention, includes all excavators equipped with a roller cutter, such as a tunnel excavator that excavates a hard rock layer and a tunnel excavator that excavates a composite formation. , Collectively referred to as a “tunnel excavator”) is provided with a roller cutter for excavating (crushing) a hard rock layer. The roller cutter rolls and excavates the rock by rotating the cutter head while being pressed by the face.
[0003]
On the other hand, in recent years, the excavation distance of such a tunnel excavator has been extended, and maintenance of a roller cutter for crushing rock has become important as the excavation distance becomes longer. One of the important maintenance management items in the roller cutter is measurement of the wear amount of the cutting edge (tip) of the roller cutter. When the cutting edge of the roller cutter wears, the excavation performance decreases, and it is necessary to replace the cutting edge according to the wear amount. That is, the measurement of the wear amount of the roller cutter is an important item that affects the excavation performance.
[0004]
Conventionally, the measurement of the amount of wear of this roller cutter is mostly performed manually by workers, and this operation requires a relatively long time, during which time the tunnel excavator stops and the excavation efficiency deteriorates. Let me. In particular, it is difficult to measure the amount of wear of the roller cutter in a tunnel excavator with a closed face such as muddy water and earth pressure type tunnel excavator, so it is difficult to measure under pressure, so after discharging muddy water or mud in the chamber Since it is necessary to enter the chamber, it is cumbersome to include ground improvement, cleaning of the chamber after removing muddy water and mud, and the efficiency is further deteriorated.
[0005]
Therefore, in a roller bit wear detecting device described in Japanese Patent Application Laid-Open No. HEI 6-117188, which is this type of prior art, a mini jack is provided so as to be able to come into and out of contact with the blade edge of the roller, and the amount of protrusion of the mini jack is set to the inside. Attempts to detect the wear state by observing with an endoscope.
[0006]
[Problems to be solved by the invention]
However, in the prior art, since an endoscope, which is a precision instrument, is provided at a mounting portion (cutter head) of the roller in order to detect a worn state of the roller, the endoscope is operated by vibration or dust when excavating a hard rock layer. It is highly likely to cause a defect, causing a problem in the life and reliability of the detection device, and it is difficult to detect a long-term stable roller wear state.
[0007]
Further, in the case of the above-described muddy water or earth pressure type tunnel excavator, since there is always muddy water or earth pressure around the roller, it is difficult to detect an abrasion state by providing an endoscope.
[0008]
[Means for Solving the Problems]
Therefore, in order to solve the above problem, the present invention provides a cutter head with a sensor that can project or retreat from the radial direction of the roller cutter provided on the cutter head toward the cutting edge of the roller cutter , An abrasion state of the roller cutter is detected from a retracted state of the actuator and a protruded state in which the actuator is brought into contact with the blade edge of the roller cutter. The control device provided in the excavator body calculates and detects from the fluid flow rate supplied to the actuator . As described above, the sensor that can protrude or retreat toward the blade edge of the roller cutter is provided, and the abrasion of the roller cutter is detected based on the amount of protrusion of the sensor. Can be detected. Further, even in the case of muddy water or earth pressure type, since the sensor protrudes and detects, the wear of the roller cutter can be stably detected. Furthermore, the work of detecting the wear of the roller cutter can be automated, and the work of detecting the wear of the roller cutter can be reduced in time and labor can be saved, thereby contributing to more efficient construction management.
[0009]
Further, by using the actuator jack such oil pressure driven into the sensor, it is possible to configure the available stable detection detector.
[0010]
Further, the projection amount of the actuator, and then, is calculated from the fluid flow rate supplied to the actuator, by calculating the fluid flow rate in the excavator body, stably the amount of projection of the actuator which is provided to the cutter head Can be calculated.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a roller cutter wear detection device showing a first embodiment of the present invention, FIG. 2 is a drawing of a roller cutter portion in the wear detection device, (a) is a partially sectional side view, b) is an enlarged view of a part A. FIG. 3 is a sectional view showing an example of a tunnel excavator provided with the wear detection device. The left side of the dashed line in FIG. 1 indicates the cutter head side, and the right side indicates the excavator body side.
[0013]
As shown in FIGS. 1 and 2A, a roller cutter 3 is provided on a cutter holder 2 for fixing a roller cutter provided on a cutter head 1. The roller cutter 3 is supported by the cutter holder 2 by a support shaft 4, and the cutter 5 is provided so as to be rotatable around the support shaft 4. The cutter holder 2 is provided with a hydraulically driven wear detecting jack 7 serving as a sensor from the radial direction of the roller cutter 3 toward the cutting edge 6 of the cutter 5. The wear detection jack 7 is provided so that the rod 8 can protrude or retreat from the radial direction of the roller cutter 3 toward the cutting edge 6, and is located at an axial measurement position where the cutter 5 and the cutter head 1 are close to each other. Is provided.
[0014]
The wear detection jack 7 is configured to be able to protrude or retreat by pressure oil supplied from the excavator body 9 side. Pressure oil supplied to the wear detection jack 7 is supplied from an oil tank 12 by a hydraulic pump 11 driven by an electric motor 10. A switching valve 13 is provided in an oil passage supplied by the hydraulic pump 11, and the switching of the switching valve 13 causes the rod 8 of the wear detecting jack 7 to project or retract. When the rod 8 projects, the switching valve 13 is switched to the left side in the figure, and when the rod 8 is retracted, the switching valve 13 is switched to the right side in the figure.
[0015]
A flow path type stroke meter 15 is provided in a discharge path 14 for discharging the pressure oil of the wear detection jack 7. With the flow type stroke meter 15, the amount of oil discharged from the discharge passage 14 until the rod 8 protrudes and stops with the pressure oil supplied to the wear detecting jack 7 from the supply passage 16 by switching the switching valve 13 Is measured so that the jack stroke is obtained. That is, the amount of oil required for projecting the rod 8 of the wear detection jack 7 is measured using the flow rate stroke meter 15 installed in the excavator body 9, and the jack stroke is calculated from the amount of oil. ing.
[0016]
The jack stroke (projection amount) calculated in this manner is calculated based on the oil amount required for the expansion and contraction of the rod 8 determined at the time of designing the wear detection jack 7 and the oil amount flowing through the flow type stroke meter 15. It is determined by the control device 17 connected to the stroke meter 15. In addition, a relief valve 19 is provided in the return path 18 connected to the supply path 16, and when the oil pressure in the supply path 16 exceeds a set value when the rod 8 of the jack 7 for abrasion detection is projected, the oil is released. It is set to return to the tank 12.
[0017]
As shown in FIG. 2 (b), the jack 7 for wear detection provided on the cutter holder 2 is in a state where the rod 8 is retracted and stored during normal excavation. When pressure oil is supplied to the oil chamber 20 from above, the rod 8 protrudes as shown by a two-dot chain line, and comes into contact with the cutting edge 6 of the roller cutter 3. At this time, even if there is soil or the like between the rod 8 and the cutting edge 6, the rod 8 protrudes until the pressure required for projecting the rod 8 exceeds the set pressure of the relief valve 19. The roller cutter 3 can protrude until it comes into contact with the cutting edge 6 of the roller cutter 3. When the rod 8 projects, the oil in the oil chamber 21 returns from the discharge path 14 to the oil tank 12 via the flow rate stroke meter 15, and the switching valve 13 is switched to supply the pressure oil to the oil chamber 21. Then, the oil in the oil chamber 20 returns to the oil tank 12.
[0018]
FIG. 3 is a sectional view showing an example of a tunnel excavator provided with the wear detecting device shown in FIG. The illustrated tunnel excavator 22 includes a cutter head 1 provided with a plurality of roller cutters 3, and an excavator body 9 provided with a gripper 25 on a front trunk 23 and a rear trunk 24. An erector 27 for assembling a segment 26 after excavation and a shield jack 28 for excavating by taking excavation reaction force on the assembled segment 26 are provided at 24. The tunnel excavator 22 is a muddy tunnel excavator, and is provided so that a mud feeding pipe 29 and a mud discharging pipe 30 communicate with the inside of the chamber 31.
[0019]
The wear detecting jack 7 is provided on a plurality of roller cutters 3 provided on the cutter head 1. The supply path 16 and the discharge path 14 (FIG. 1) for driving the wear detection jack 7 are provided via a swivel joint 32 provided between the cutter head 1 and the excavator body 9. .
[0020]
Since the outer peripheral side of the cutter head 1 wears the roller cutter 3 faster than the inner peripheral side, the wear detecting jack 7 may be provided only on the outer peripheral side roller cutter 3. Further, a wear detecting jack 7 may be provided on the roller cutter 3 in the intermediate portion to predict the overall wear state.
[0021]
According to the roller cutter wear detection device 33 configured as described above, the tunnel excavator 22 is stopped after excavating a predetermined distance, the switching valve 13 is switched, and the hydraulic motor 10 is driven, so that the wear detection jack 7 is driven. Supply pressure oil. This pressure oil is supplied to the wear detection jack 7 from the supply path 16, and the rod 8 is made to protrude toward the cutting edge 6 of the roller cutter 3. Due to the pressure set by the relief valve 19 provided in the return path 18, even if, for example, earth and sand exist between the rod 8 and the cutting edge 6 of the roller cutter 3, the rod 8 is opposed to the soil by the roller cutter 3. When the oil pressure comes into contact with the cutting edge 6 and the hydraulic pressure exceeds the set pressure, the pressure oil is returned from the relief valve 19 to the tank 12.
[0022]
In this way, the amount of oil discharged when the rod 8 is brought into contact with the cutting edge 6 of the roller cutter 3 is measured by the flow-type stroke meter 15, and the signal is input to the control device 17 to calculate the stroke amount of the rod 8. Is done. The wear amount of the blade 6 of the roller cutter 3 is calculated from the stroke amount and the stroke amount until the rod 8 of the wear detecting jack 7 comes into contact with the blade 6 of the new roller cutter 3. If this wear amount has reached a predetermined wear amount, it is detected that replacement is required, and a signal indicating that replacement is required is issued to the operator. This signal is issued by, for example, a blinking lamp or the like.
[0023]
Therefore, it is possible to easily detect the wear state of the roller cutter 3 from the excavator body 9 side without an operator entering the chamber 31. In addition, the wear detection of the roller cutter 3 by the wear detection jack 7 (sensor) can be automatically controlled by the control device 17, so that the work of measuring the wear amount of the roller cutter 3 can be automated and human labor can be saved. Becomes possible.
[0024]
Further, according to the roller cutter wear detecting device 33, even in the case of the muddy water or earth pressure type tunnel excavator, the work of measuring the amount of wear of the roller cutter 3 without removing the muddy water and earth pressure in the chamber can be performed on the excavator body 9 side. , The efficiency of construction and the operation rate of the tunnel excavator can be improved.
[0032]
Furthermore, the above-described embodiment is an embodiment, and various changes can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.
[0033]
【The invention's effect】
The present invention is implemented in the form described above, and has the following effects.
[0034]
The wear condition of the roller cutter provided on the cutter head can be detected stably from the excavator body side, and even in the case of muddy water or earth pressure type, the wear of the roller cutter can be detected stably, so that the wear of the roller cutter can be detected. Work can be shortened and human labor can be saved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a roller cutter wear detection device according to a first embodiment of the present invention.
FIGS. 2A and 2B are drawings of a roller cutter portion in the wear detecting device shown in FIG. 1, wherein FIG. 2A is a partially sectional side view, and FIG.
FIG. 3 is a sectional view showing an example of a tunnel excavator provided with the wear detecting device shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cutter head 2 ... Cutter holder 3 ... Roller cutter 4 ... Support shaft 5 ... Cutter 6 ... Cutting edge 7 ... Wear detection jack 8 ... Rod 9 ... Excavator body 10 ... Electric motor 11 ... Hydraulic pump 12 ... Oil tank 13 ... Switching valve 14 ... Discharge path 15 ... Flow rate stroke meter 16 ... Supply path 17 ... Control device 18 ... Return piping 19 ... Relief valves 20, 21 ... Oil chamber 22 ... Tunnel excavator 23 ... Front trunk 24 ... Rear trunk 25 ... Gripper 26 ... Segment 27 ... Electa 28 ... Shield Jack 29 ... Sludging Pipe 30 ... Sludging Pipe 31 ... Chamber 32 ... Swivel Joint 33 ... Roller Cutter Wear Detector

Claims (1)

The cutter head is provided with a sensor capable of projecting or retracting from the radial direction of the roller cutter provided on the cutter head toward the cutting edge of the roller cutter, and the sensor is configured by an actuator. The abrasion state of the roller cutter is detected from the protruding state brought into contact with the blade edge of the roller cutter , and the protruding amount of the actuator is controlled on the excavator body based on the fluid flow supplied to the actuator. A roller cutter wear detection device configured to detect by calculating the device.

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