JPH0448180B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a self-propelled gas leak detection and recording device that detects gas leaks from underground gas pipes and the like.

[Conventional technology]

Conventionally, gas leakage points in gas pipes buried underground have been detected by a worker operating a hand-held trolley equipped with a detector while visually checking and collecting data via the detector's detection response meter. The process is completely dependent on manual operation by the operator. Therefore, even when it is necessary to sample data at high density, operations are left solely to the operator. Therefore, obtaining reliable data requires skill and is a heavy burden on the operator.

[Problems to be solved by the invention]

In addition, the inner surface inspection device for pipes disclosed in JP-A No. 59-147259 discloses a configuration in which the operator visually inspects the parts where abnormalities are suspected by repeatedly moving back and forth. This method requires skill because it determines the areas to be careful about, and it also has the drawback that it cannot detect with high density while the vehicle is moving forward, and that the inspection time is increased because it repeatedly goes back and forth. Furthermore, with such a method, not only is accurate detection not possible because it relies only on the skill of the operator, but there is also a risk that the amount of recorded data will increase. In addition, in the automatic gas leakage monitoring device for blast furnaces, etc. disclosed in Japanese Patent Application Laid-open No. 58-160836, when the detected Co gas concentration exceeds a set value, the gas detector stops and the support is expanded and contracted to A configuration is disclosed for detecting a cooling box placed in a cooling box. However, in this case, the gas detector stops advancing and the support expands and contracts, which has the disadvantage that the time required for the entire detection is longer. Furthermore, in each of the above configurations, no detection data is recorded at all. In addition, the leak detection device for city gas disclosed in Utility Model Application Publication No. 56-51065 shows a structure in which two gas concentration detection sections are provided in the vehicle and the measurement results are continuously recorded. Therefore, a recording medium with a large capacity is required. This invention was newly created in view of the above circumstances, and allows the self-propelled vehicle to proceed as it is without stopping or repeatedly moving back and forth, and automatically collects gas leak data in high density in the event of an abnormality. To provide a self-propelled gas leak detection and recording device capable of recording vehicle travel data as well as vehicle travel data.

[Means to solve the problem]

In this application, in order to solve the above problems,
As shown in the functional block diagram of FIG. 1, (a) gas leak detection means 100 is provided in a self-propelled vehicle; (b) gas leak concentration detected from gas leak detection means 100 exceeds a standard value. (c) A gas leak pattern determining means 110 is provided for determining which of a plurality of predetermined patterns the gas leak pattern belongs to depending on the level of the concentration. A control signal generating means 120 is provided for outputting a control signal for changing to a set vehicle speed pattern or a preset sampling interval of the gas leak detection means together with the vehicle speed pattern. (d) Based on this control signal, the drive mechanism D is controlled to change the vehicle speed of the self-propelled vehicle, or at the same time, the sampling interval of the gas leak detection means is changed to change the sampling density with respect to the traveling distance. (e) data for recording vehicle speed data obtained from a vehicle speed sensor that detects the vehicle speed of the self-propelled vehicle at the sampling interval and gas concentration data obtained from the gas leak detection means in a memory; We took the technical measure of installing a writing device.

[Effect]

When the gas leak data detected by the gas leak detection means exceeds a reference value, the gas leak pattern determination means determines which of predetermined gas leak patterns it belongs to. This gas leak pattern includes a vehicle speed pattern depending on the degree of gas leak, or a data sampling interval of the gas leak detection means together with the vehicle speed pattern. Therefore, when the gas leak pattern is determined, a control signal is output based on this, and the vehicle speed is changed to the vehicle speed of the determined vehicle speed pattern, or the sampling interval of the gas leak detection means is changed at the same time, The sampling density for mileage is changed. At the same time, the vehicle speed sensor detects the vehicle speed at the same interval as the sampling interval of the gas leak detection means. This gas concentration data and the vehicle speed data obtained from the vehicle speed sensor are recorded in the memory by a data writing device.

【Example】

Embodiments of the present invention will be described below with reference to FIG. 2 and subsequent drawings. This gas leak detection recording device includes a gas leak detection sensor S1 for detecting gas leaks, a gas leak information recording device 1, a vehicle section 2 for moving these, and a gas IC card 4 showing an example of an external storage medium as a storage medium for storing leaked information, etc. and inputting data to a data processing device installed at an external management office, etc.
It is composed of. In this embodiment, the gas leak detection sensor S1 is connected to the I/O port of the microcomputer via an interface for serial communication, and the keyboard K is connected to the I/O port of the microcomputer via the interface. Each signal is input. Further, the printer P and the speed control device 5 are each connected to the I/O port of the microcomputer via an interface, and the central processing unit CPU
The output signal from is being input. The speed control device 5 is connected to a drive mechanism D of the vehicle, and is configured to drive an actuator in response to a control signal from the CPU to switch the speed control lever 6 to a predetermined position. In the case of this embodiment, this switchable speed is in two stages (AKm/h, BKm/h), but after opening the switch of gas leak detection sensor S1, it is necessary to manually operate the speed control lever. Therefore, the vehicle can run as a normal self-propelled vehicle without being limited to the above-mentioned speed. Next, in the central processing unit CPU of the microcomputer of the gas leak detection and recording device, a conversion means 11 converts the detection signal of the gas leak detection means sensor S1 into a gas concentration value, and a gas concentration value is calculated based on the obtained gas concentration value. Determination means 12 for determining which of predetermined gas leakage patterns the gas leakage pattern is included in according to the degree of gas leakage.
and the vehicle speed or sensor sampling period (time) determined by the determined gas leak pattern.
is the same as the vehicle speed or sampling period (time) before the data detection.
, a clock unit (clock generator) 17 that outputs real-time time data and has a plurality of (three types in this embodiment) sensor data sampling cycle generation circuits 14 to 16; and the determination means 12, 13. pattern data calculation and storage means 18 for calculating and storing the determined pattern data and time data at which a pattern change occurred and outputting the data to the printer P; and a control signal generating means for outputting a control signal based on the pattern. 20, and fixed data manually entered from the keyboard K (for example, the lot number of the gas leak inspection area,
position data such as drawing number, coordinates, etc.) and the conversion means 1
The gas leakage information such as the gas concentration data obtained in step 1 and the state determination data obtained in the pattern data calculation storage section 18 are stored in the memory (RAM) in a predetermined order as shown in the write format described later, and then the data is written. It is output to the input means 19. An IC card is removably inserted into the card insertion hole of the data writing means 19 by the worker at the start of work, and the data stored in the memory is sequentially written. In addition, 3 in the figure is a data reproducing device which is provided externally and which reproduces the data recorded on the IC card 4 which is removed from the data writing means 19 by the worker after the work is completed, and the data reproducing device which reproduces the data. This is a data processing device configured with a microcomputer that performs analysis processing. Next, to explain the operation of this gas leak detection recording device, the central processing unit CPU processes the detection signal according to a gas leak recording program stored in advance in a memory (ROM). That is, when the gas leakage information recording device 1 is started, the gas leakage control program is called from the memory and accessed, and the processing is performed as shown in the flowchart shown in the third figure. First, in step, when the switch for sensor operation is turned on, the detection signal from the gas leak detection sensor S1 is A/D converted, and the gas leak concentration value is detected and recorded in the memory. Next, in step, it is determined to which of the predetermined gas leakage patterns the gas leakage concentration value belongs. Here, the gas leak pattern is, for example, if the detected gas leak concentration value is less than Appm, it is considered a safe concentration area (area a);
If it is less than Bppm, it is in the caution concentration area (region B), and if it is more than Bppm, it is in the dangerous concentration area (region c).
shall be. Here, in the case of area a, the traveling section is at the normal measured traveling speed (AKm/h) and the gas leak detection sensor S
1 has a normal sampling period (LMHz), but in the case of region b, the detection traveling speed is slower (BKm/h), and the gas leak detection sensor S1 has a slightly shorter sampling period (MMHz). It will be done. In addition, in the case of region c, the running section has the same measured traveling speed (BKm/h) as in region b, and the gas leak detection sensor S1 has a shorter sampling period (SM
Hz) is predetermined. When it is determined which pattern it belongs to, the current drive (measured traveling speed of the traveling section and sampling period of the gas leak detection sensor S1) is determined.
It is determined whether or not the pattern matches this pattern, and if it does not match, the time at the time of pattern change is retrieved from the clock section (clock generator) in steps and recorded in memory, and sampling is performed according to each pattern in steps. Emit a periodic control signal. Alternatively, at the same time, a control signal for controlling the detected traveling speed is issued to the speed control device. In step, the speed control device switches the speed control lever to AKm/h or BKm/h via the actuator based on the control signal to control the vehicle at a predetermined speed. The sampling period control signal switches the three-stage data sampling generation circuit of LMHz, MMHz, and SMHz provided in the clock section to a predetermined frequency to control the sampling period of the gas leak detection sensor S1. The gas leakage pattern information detected in this manner is used to output the above-mentioned determination results in real time to a printer in a step. Note that it is preferable to generate a buzzer sound when outputting by printing, since this can attract the attention of the operator. When the operator confirms area B or C by looking at the gas leak pattern information printed out in the step, the operator inputs position data such as the coordinates of the inspection area using the keyboard in the step. The gas leak position information input in this way is temporarily stored in the memory of the microcomputer together with the gas leak pattern information. When the sensor drive switch is turned OFF by the operator in step, this gas leak inspection work is judged to be completed, and the information stored in the memory is written to the IC card via the data writing device in step. The program ends. This data may be written at any time when a predetermined amount of data is stored in the memory (RAM). Further, in the present invention, the gas leak information may be recorded as the gas leak concentration value, or may be recorded in a pattern as described above. In FIG. 2 above, detection of the running speed of the vehicle section is omitted for convenience of explanation, but as shown more clearly in FIG. Since the measured travel speed information is recorded, it is possible to manage not only the gas leak area but also the working conditions of the workers. That is, in this embodiment, as shown in FIG. 5, in addition to the configuration shown in FIG.
It is also connected to the gas leak information recording device 1 via a serial communication interface. Here, the traveling speed sensor S2 is a vehicle speed sensor that measures the time when the number of pulses generated by the rotation of the vehicle reaches a predetermined value and detects the speed. In this embodiment, this vehicle speed sensor S2 is connected to a sampling generation circuit of a clock section of a microcomputer, and obtains vehicle speed information by a conversion means 11B sampled at the same period as that of the gas leak detection sensor S1. In addition, the data sampling period of the gas leak detection sensor S1 is controlled by a sampling period control signal determined by a gas leak pattern depending on the degree of gas leak concentration. Further, the vehicle speed value measured by the determining means 12B indicates whether the measured traveling speed is AKm/h, BKm/h, or A.
It is determined whether the speed exceeds Km/h (referred to as C), and the speed pattern information is printed and displayed externally together with the gas leakage pattern information. When recording data to an IC card, please refer to Figure 6a.
As shown in the write format, after initializing the date, work start time, and work code, the operation (ON) and stop (OFF) data of the gas leak detection sensor S1 and changes in the gas concentration range are written as the status code.
In the data format, as shown in FIG. 6B, vehicle speed values and gas concentration values sampled at the same period are recorded in binary format, and forward/reverse data, etc., are recorded at contact inputs. The data on the IC card with data recorded in this manner is read by a data reproducing device or a data processing device at a management office or the like and analyzed for management purposes. That is, the data processing device can calculate the travel time of a predetermined vehicle speed pattern based on the time when the pattern was changed, the type of gas leak pattern that was changed, and the number of subsequent data, and the vehicle speed of the travel pattern. The travel distance can be calculated by integrating the value with the travel time. Furthermore, if a sensor that detects the forward/reverse movement of the vehicle and a sensor that detects the steering angle are used and recorded together, the travel trajectory for gas leakage inspection can be reproduced. In addition, examples of external storage devices according to the present invention include, but are not limited to, EPROM, floppy disks, optical disks, memory packs, MTs, etc. in addition to IC cards, and portable external storage devices include, but are not limited to, Of course, it is fine as long as it is the body.

【Effect of the invention】

This invention shortens the data sampling interval of the gas leak detection means in accordance with the concentration detected by the gas leak detection means, so that high-density gas leak detection data can be recorded only at necessary locations relative to the distance traveled. . In addition, the running speed of a self-propelled vehicle is uniformly determined in a pattern when the gas leakage concentration is above a standard value, so the running speed of the self-propelled vehicle is determined in accordance with the sampling interval of the gas leak detection means. Since the data is sampled, the distance traveled by the self-propelled vehicle can be calculated, and work data can be obtained along with records of gas leaks. This reduces the burden on the operator and allows highly reliable data to be recorded with a small storage capacity. Furthermore, since self-propelled vehicles do not need to stop or backtrack during detection, the time required for inspection is not wasted.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a block diagram showing a part of an embodiment of the gas leak detection and recording device of the present invention, FIG. 3 is a flowchart of the same, and FIG. 4 is a side view of the same. , FIG. 5 is a block diagram showing the entire configuration of this embodiment, FIG. 6a is a write format of an IC card, FIG. 6b is a data format, and FIG. 6c is a graph explaining the control of the present invention.

Claims (1)

[Claims] 1. A gas leak detection means provided in a self-propelled vehicle, and a gas leak detection means that determines whether the obtained gas leak concentration falls into one of a plurality of predetermined patterns depending on the degree of concentration exceeding a reference value. gas leakage pattern determination means for determining whether the gas leakage pattern belongs to the gas leakage pattern; a control signal generating means for outputting a control signal; and, based on the control signal, changing the vehicle speed of the self-propelled vehicle or changing the sampling interval of the gas leak detection means together with the same, thereby changing the sampling density with respect to the traveling distance. a control device; a vehicle speed sensor that detects the vehicle speed of the self-propelled vehicle at the sampling interval; and data that records gas concentration data obtained from the gas leak detection means and vehicle speed data obtained from the vehicle speed sensor in a storage body. A gas leak detection and recording device comprising a writing device. 2. The gas leak detection and recording device according to claim 1, characterized in that the gas leak detection and recording device includes an external output device and an external input device. 3. The gas leak detection and recording device according to claim 1, wherein the gas concentration data stored in the storage body consists of gas leak pattern data, and the vehicle speed data consists of speed pattern data.