JP2530046B2 - Self-diagnosis method for mud transport equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a self-diagnosis method for mud transportation equipment.

<< Prior Art >> As is well known, the shield method is a method of constructing a tunnel in the ground, and a shield excavator for excavating the ground is used for this type of method.

By the way, the shield work in recent years tends to increase under complicated ground conditions, difficult conditions such as large depth and large diameter.

Construction under such difficult conditions requires not only higher safety but also labor saving and improvement of construction efficiency.

Therefore, for example, "Construction Machinery" published by Nippon Kogyo Shuppan in November 1989 discloses a failure diagnosis system for the purpose of automation of shield work and labor saving.

The failure diagnosis system shown in this document is based on a so-called expert system, and has knowledge of a shield construction expert as a database, and infers a failure point based on this database. However, when this failure diagnosis system is applied to the muddy water transportation facility of the muddy water shield moat machine, there were technical problems described below.

<< Problems to be Solved by the Invention >> That is, in the failure diagnosis system disclosed in the above document, when inferring a failure position, the failure diagnosis is performed in an interactive manner with an operator, so that the operation becomes complicated, If the operator does not operate, no conclusion can be obtained, and if there is an operation error, there is a problem that appropriate inference cannot be performed.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a self-diagnosis method capable of automatically and comprehensively determining the state of a mud transportation facility. Especially.

<< Means for Solving the Problem >> In order to achieve the above object, the present invention provides a mud pipe for supplying mud to a mud chamber of a shield mower, and a mixture of excavated sand and mud from the mud chamber. In a self-diagnosis method of a muddy water transportation facility comprising a mud discharge pipe for discharging the mud, a mud pump provided for the mud pipe, and a mud pump provided for the mud pipe, The flow rate, specific gravity, rotation speed of the pump, drive current, pressure in the mud chamber and pipe are measured respectively, and the average value, the maximum value, and the average value of the obtained measured values are selected appropriately according to the diagnostic item. Minimum value, variance,
It is characterized in that statistical processing such as calculation of a regression coefficient is performed and the state of the mud transportation facility is judged by fuzzy inference based on the obtained statistical processing data.

<< Operation and Effect of the Invention >> According to the self-diagnosis method of the above configuration, if the membership function is set for each measured value, the self-diagnosis of the mud transportation equipment is automatically performed.

Embodiment Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show an embodiment of a self-diagnosis method for muddy water transportation equipment according to the present invention.

In the self-diagnosis method shown in the same figure, devices such as that shown in FIG. 1 are used.

In FIG. 1, reference numeral 10 denotes a muddy water type shield excavator, and the shield excavator 10 is a cylindrical skin plate 12
And a cutter 14 rotatably installed at the tip of the skin plate 12.

A large number of cutter bits are planted on the front surface of the cutter 14, and partition walls 16 are fixed to the skin plate 12 at predetermined intervals on the rear surface side thereof, and a mud chamber 18 is formed therebetween.

The partition 16 is provided with a mud pipe 20 for supplying muddy water into the muddy water chamber 18 on its upper side, and discharges a mixture of excavated earth and sand and muddy water from the muddy water chamber 18 on the lower side. Sludge pipe
22 are provided.

On the other hand, on the ground side, a mud water tank 24 and a recovery tank (not shown) are installed. The mud water tank 24 is connected to the mud sending pipe 20 via the mud sending pump P1, and the recovery tank has a plurality of drainage tanks. Mud pump P2, P3
...... The mud pipe 22 is connected via PE, and the mud pipe 22
For the mixture of muddy water and excavated earth and sand stored in the collection tank via the, only the excavated earth and sand in the mixture is separated, and the muddy water is the muddy water tank.
Introduced in 24 and reused.

Further, two bypass pipes 25 and 26 are connected between the mud pipe 20 and the mud pipe 22, and one of the bypass pipes 25 is opened and closed by opening and closing valves provided before and after the bypass pipe 25. This is for allowing the muddy water sent from the mud pipe 20 to flow out to the mud pipe 22 without flowing into the muddy water chamber 18 (bypass mode).

By operating the valve of the other bypass pipe 26 in the same manner as described above, the muddy water sent from the muddy water pipe 20 is supplied into the muddy water chamber 18 from below, and the muddy water is drained from above the muddy water chamber 18 from above. Used for outflow into pipe 22 (reverse injection mode).

In the shield excavator 10 configured as described above, the segment is excavated while taking the reaction force of the shield jack,
The earth and sand excavated by the cutter 14 is taken into the muddy water chamber 18 and is discharged together with the muddy water from the mud discharge pipe 22 to the recovery tank outside the mine to construct a tunnel.

At this time, the mud transport facility (mud tank 24 → mud pump P1 →
Mud pipe 20 → mud chamber 18 → mud pipe 22 → mud pump P2, P3, ……
(PE → collection tank), self-diagnostic device installed on the ground side 3
At 0, the self-diagnosis is automatically performed as follows.

It should be noted that the self-diagnosis device 30 includes a plurality of multi-transmission device slave stations 32 that measure values from various sensors installed in the tunnel.
A master station 34 of the multiplex transmission device for receiving via the is connected.

The self-diagnosis performed by the self-diagnosis device 30 is divided into four modes of face circulation, bypass, stop, and reverse injection of the muddy water transport facility, and the processing procedure is shown in FIG.

When the processing procedure starts, first, the measured value of the sensor is captured in step _S 1, and the information captured in step _S 2 is stored.

Then, in step _S 3, whether measured values of a predetermined number of times has been captured is determined, when incorporated predetermined number of times, the statistical processing of the measurement values stored in step _S 4 is executed.

In the statistical processing executed at this time, a population is created with an order on the time axis, and the average value, maximum value, minimum value, variance, standard deviation value, and regression coefficient are calculated for this population.

In step _S 5, it is determined whether the current there in which mode mud transport equipment, fuzzy inference in accordance with each the Suppu _S 6 mode is performed, the results obtained by the inference and displayed in step _S 7 Start Return to.

The main part of the above self-diagnosis will be specifically described by taking a face circulation mode as an example. First, in this mode, as a sensor for detecting the driving state of the muddy water transportation equipment, as shown in FIG. Face water pressure gauges a1 and a for detecting internal pressure
2, the mud pump P1 is equipped with a tachometer and ammeter,
In addition, differential pressure densitometers b1 and b2 and electromagnetic flow meters c1 and c2 are installed in the sending and discharging mud pipe 20, respectively.

Also, the sludge pumps P2, P3, ... PE are equipped with tachometers, respectively, and pressure gauges for measuring suction and discharge pressures are provided before and after each pump P2, P3, ... PE.
d1 to E and e1 to E are installed, respectively.

The measured values with these measuring devices are the face water pressure A, the mud flow rate B, the rotation speed C of the mud pump P1, the current value D of the mud pump P1, the mud flow rate fluctuation value E, and the mud specific gravity F. , Mud flow rate fluctuation value G, mud pump P2 to PE rotational speed fluctuation value H, mud pump P2 to PE rotational speed fluctuation value I, mud flow rate J, mud pump P2
To PE suction pressure K, same pressure fluctuation L, sludge pump P2 to PE
The discharge pressure M and the pressure fluctuation N are input to the self-diagnosis device 30 directly or through the multiplex transmission devices 32 and 34.

On the other hand, as self-diagnosis items in the face circulation mode, in this embodiment, the face water pressure is abnormally decreased (power motor of the mud pump P1 is abnormal), the face water pressure is abnormally decreased (foreign matter is caught in the mud pump P1). ), Abnormal drop in cutting face water pressure (damage of impeller part of mud pump P1), Abnormal decrease in cutting face water pressure (poor control of rotation speed of mud pump P1), Abnormal decrease in cutting face water pressure (excessive amount of sludge), cutting face Abnormal decrease in water pressure (abnormal rotation speed control of mud pumps P2 to PE), mud pipe 22
The seven items of occurrence of blockage are listed.

The measured values A to H are appropriately selected according to the diagnostic items of, and the membership functions used for fuzzy inference are determined in advance.

FIG. 3 shows the relationship between the above diagnostic items and the output and membership functions.

In executing the self-diagnosis, the measurement values A to H are statistically processed as described above, and the average value or the like is calculated.

Table 1 below shows the meanings of the symbols shown in each column of FIG. 3 as a table. For example, AL (3) shown in the mud flow rate B in the diagnostic item line is It is the average value of the mud flow rate B between arbitrary loops for diagnosis, and AB (10) is the average initial set value of the mud flow rate for 10 rings.

Now, with respect to the inference in the state set as described above, for example, how the inference is performed by the abnormal decrease in the face water pressure of the diagnostic item will be described. Whether or not the measured value is greater than the set value is calculated, and if this is greater than or equal to the set value, 100%
It is judged that the face water pressure is increasing based on the certainty factor.

For the mud flow rate B, when the average value in the three loops is about 60% or less of the average initial setting value in 10 rings, the face water pressure is abnormally reduced to 100. It is judged by the certainty factor.

Further, in the rotational speed C of the mud pump P, when the average value of 3 rings is about 60% or less of the average initial setting value of 10 rings, the face water pressure decreases with 100% certainty. Is judged.

Further, the current value D of the mud pump P is judged to have decreased the face water pressure with a certainty of 100% when the average value of one loop is about 40% or less from the average initial setting value for 10 rings. Done.

Then, for the final determination of the abnormal reduction of the face water pressure (abnormality of the power motor of the mud pump P), the one with the minimum certainty factor of each of the above determinations is adopted. It is inferred that the cutting face water pressure is abnormally reduced due to an abnormality in the power motor of the mud pump P1.

Such inference is automatically performed by a similar method for each of the diagnostic items ~, and the result is displayed.

In the above description, the self-diagnosis method in the face circulation mode of the muddy water transportation facility was described, but for the bypass mode, the stop mode and the back injection mode, the diagnostic items corresponding to each mode are set and set. If a measured value is appropriately selected according to the diagnosed item and a membership function is set for each, self-diagnosis is automatically performed as in the above case.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of an implementation state of a self-diagnosis method of a muddy water transportation facility according to the present invention, FIG. 2 is a flowchart showing a processing procedure of the method, and FIG. 3 is a diagnosis item, a measured value and a membership function. It is explanatory drawing which shows a relationship. 10 …… Shield moat machine 18 …… Mud chamber 20 …… Mud pipe 22 …… Mud pipe P1 …… Mud pump P2, 3 …… Mud pump 30 …… Self-diagnosis device

Claims (1)

(57) [Claims] 1. A mud feed pipe for supplying mud to a mud chamber of a shield machine, a drain pipe for discharging a mixture of excavated sand and mud from the mud chamber, and a mud pipe provided on the mud pipe. In a self-diagnosis method for a muddy water transportation facility including a mud pump and a mud pump provided in the mud pipe, the flow rate of the mud and the mixture, specific gravity, rotation speed of the pump, drive current, the mud chamber The pressure in each tube is measured, and the statistical values such as the average value, the maximum value, the minimum value, the variance, and the calculation of the regression coefficient are applied to the measured values appropriately selected from the obtained measured values according to the diagnostic item, A self-diagnosis method for a muddy water transportation facility, characterized in that the state of the muddy water transportation facility is determined by fuzzy reasoning based on the obtained statistically processed data.