JPH11202055A - Seismometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a seismometer which can be leveled conveniently and quickly by calculating and indicating tilt of the seismometer using an inclination operating means, an inclination adjusting mechanism, a deciding/indicating means, and the like. SOLUTION: A semiconductor acceleration sensor detects the installation state of a seismometer and delivers X axis and Y axis outputs to a tilt operating means. Based on the operation results, a lighting decision means operates a circuit for lighting a LED 38a, 38b, 38c corresponding to a flange at low position in the inclination angle of the seismometer is large. When the tilt angle falls within a given range, corresponding a LED 38a, 38b, 38c is flickered. A worker can grasp the position and the adjusting amount of a flange 22, based on the lighting or flickering of the LED 38. When the tilt is decreased and adjusting operation is ended, the LED 38 is unlighted. According to the arrangement, leveling work of the seismometer can be carried out simply and quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earthquake detection device which is installed in a governor room or the like in a gas supply system and which can easily and efficiently perform a leveling operation at the time of installation and maintenance of the device.

[0002]

2. Description of the Related Art When an earthquake occurs in a gas supply system, it is necessary to urgently shut off the gas supply to prevent the damage caused by gas leakage from spreading and the occurrence of secondary disasters. There is provided an earthquake detection device using the same.

In such a conventional earthquake detecting apparatus, for example, a so-called servo-type acceleration sensor for detecting vibration is housed in an explosion-proof case, and the explosion-proof structure is secured by sealing it with a lid. The explosion-proof case was configured such that a small bubble level for performing the leveling operation was provided on the surface of the cover. The explosion-proof case is fixed to a floor of a governor room, which is an explosion-proof area, with a fixing bracket or a fixing bolt so as to be adjustable in inclination. In addition,
A so-called mechanical seismic sensor or the like is also used in the apparatus in order to ensure the reliability of earthquake detection.

By the way, in order to detect an earthquake having a high correlation with the degree of damage to a building in such an earthquake detecting apparatus, means for using an SI (Spectrum Intensity) value as a measure of the intensity of earthquake motion has been proposed.
It has been implemented. This SI value is generally expressed by the following equation.

(Equation 1) Here, k is a coefficient, Sv is a speed response spectrum, T is a cycle, and h is a damping coefficient of a building.

[0005] Such means is disclosed, for example, in JP-A-62-12.
Nos. 884, 62-12885, 62-12886, 6-214040, and 8-36062. In such means, the SI value is obtained by inputting the acceleration waveform of the seismic motion measured by the seismic sensor to an arithmetic unit that satisfies the equation of motion of the one-degree-of-freedom vibration system, and obtaining the speed response every moment, and obtaining the maximum value of the speed response. Spectrum, ie,
It is obtained by performing a predetermined calculation from the velocity response spectrum.

Next, the operation will be described. At the time of installation or maintenance of the apparatus, an operator adjusts the degree of tightening of fixing bolts and the like to level the apparatus based on the indication of the bubble level provided on the surface of the explosion-proof case.

When the servo-type acceleration sensor of the device installed in this way detects an earthquake, the above-mentioned SI value is calculated based on the detection signal. The emergency shutdown instruction is output in consideration of the output of the earthquake sensor and the like. As a result, the gas supply is shut off urgently, thereby preventing the damage caused by gas leakage from spreading and the occurrence of secondary disasters.

[0008]

Since the conventional earthquake detecting apparatus is configured as described above, there are problems that the sensitivity of the small bubble level is low and the leveling operation of the apparatus is difficult. Was. In addition, since the bubble level is provided on the lid of the explosion-proof case, if the lid is attached to the explosion-proof case at an angle, inappropriate leveling will be performed based on the lid. However, the servo type acceleration sensor in the explosion-proof case cannot be accurately leveled, and the accuracy of earthquake detection is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a highly reliable earthquake detecting device which can easily and quickly perform a leveling operation of the device. .

[0010]

According to a first aspect of the present invention, there is provided an earthquake detecting apparatus comprising: an acceleration sensor; a tilt adjusting mechanism;
It is provided with an inclination display, an inclination calculating means, and a judgment display means.

According to a second aspect of the present invention, there is provided an earthquake detecting device, wherein a lighting device which can be turned on and off is used as the tilt indicator, and the degree of tilt of the device is displayed by a combination of the lighting and the turning off. Things.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a gas supply system using an earthquake detection device according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing the earthquake detection device, FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a plan view showing a state where a cover of the earthquake detection device is removed, and FIG. 5 is a circuit configuration diagram of the earthquake detection device.

First, a schematic configuration of a gas supply system using the present invention will be described. In FIG. 1, 1 is a gas production plant having an explosion-proof area, 2 is a gas tank, 3 is a high-pressure conduit,
Is the governor, 5 is the governor station with explosion-proof area, 6
Is an intermediate pressure conduit, 7 is a governor, 7a is an emergency shutoff valve, 8 is a monitoring room, 9 and 10 are emergency shutoff instructions, 11 is a governor room as an explosion-proof area, and 12 is a governor having an emergency shutoff function. 2
0 is an explosion-proof case described later, 30 is 3 axes (X, Y, Z axes)
A semiconductor acceleration sensor (acceleration sensor) described later capable of measurement, 40 is an arithmetic processing circuit described later, 57 is a relay signal output from the arithmetic processing circuit 40, and 60 is a control provided on the governor room outer wall surface (non-explosion-proof area). It is a board. Reference numeral 61 denotes a mechanical earthquake sensor installed in a control panel 60 using a pendulum or the like. 62 denotes a governor 1 when both a relay signal 57 and an output signal of the mechanical earthquake sensor 61 are output.
A determination circuit 64 for generating a cutoff signal 63 for cutting off the signal 2;
Is a low pressure conduit, 65 is a gas-supplied home, and 66 is a gas-supplied factory.

Next, the earthquake detecting apparatus will be described in more detail. 2 to 4, reference numeral 20 denotes an explosion-proof case having a cover 20a that can be opened and closed via an O-ring 21 and an electric wire lead-out hole 20b, and formed of a metal such as aluminum so as to satisfy a predetermined pressure resistance. is there. This explosion-proof case 20 is manufactured so as to satisfy the standard for explosion-proof electrical equipment (Ministry of Labor). In other words, the length and the number of threads of the screw portion between the explosion-proof case 20 and the cover 20a, the pressure-resistant packing (described later) in the wire lead-out hole 20b, and the like satisfy the above-mentioned standards.

Reference numerals 22a, 22b, and 22c denote flanges (tilt adjusting mechanisms), 23 denotes a screw hole, 24 denotes a shield wire in which various wirings described later are combined, 25 denotes a pressure-resistant packing made of, for example, butyl rubber, and 26 denotes a pressure-resistant packing 25. A compression bolt 27 for compressing is a lock nut for fixing the compression bolt 26. That is, the shield wire 24 is inserted through the wire lead-out hole 20b, and the pressure-resistant packing 25, the compression bolt 26, and the lock nut 27 are provided, so that the hermeticity and pressure resistance of the portion can be secured. The length of the pressure-resistant packing 25 after compression satisfies the above-mentioned standard.

Reference numeral 30 denotes a semiconductor acceleration sensor. For example, a sensor using a change in capacitance and a signal processing circuit thereof described in Japanese Patent Application Laid-Open No. 9-43068 can be used. As described in the prior art section of the publication,
An electrode is attached to each of the opposing surfaces of the fixed substrate and the flexible substrate, and a plurality of pairs of capacitance elements are provided. The XY plane is set parallel to the substrate surface. X, Y,
The X-, Y-, and Z-axis components are detected based on the change in acceleration in the three-dimensional Z-axis direction based on the change in capacitance between a plurality of pairs of capacitance elements. Then, as an output with respect to the acceleration in the X-axis direction, the capacitance difference (C21-C23) between the capacitance elements C21 and C23, and as an output with respect to the acceleration in the Y-axis direction, the capacitance between the capacitance elements C22 and C24. As an output with respect to the capacitance difference (C22-C24) and the acceleration in the Z-axis direction, it can be detected as the capacitance C25 of the capacitance element C25 or C21 + C22 + C23 + C24.

The inclinations of the X axis and the Y axis are obtained by detecting an increase or decrease in capacitance due to a change in gravity, and determine whether the inclination direction is positive or negative compared to the output in a normal state. It is determined by things. Regarding the Z axis, the capacitance increases or decreases due to the vertical acceleration, so that the direction of the acceleration is known, but there is no relation to the inclination.

The relationship between the output of each axis and the amount of tilt is initially tested in the factory in advance, and by recording this in the memory 44 or the like, the amount of tilt of the apparatus can be easily obtained. Note that the semiconductor acceleration sensor 30 is not limited to a capacitance type acceleration sensor, and for example, a piezoresistive type or a piezoelectric type acceleration sensor can also be used.

Reference numeral 31 denotes a support member, and 32 denotes a CPU.
A board, 33 is a power board, 34 is a terminal block, 35 is a guard, and 36 is a loader connection terminal for connecting a portable setting device (not shown) to a loader interface 55 described later.

Reference numeral 37 denotes an LED for confirming power supply provided on the central axis of the explosion-proof case 20, 38a denotes an LED (A) (lighting device), 38b denotes an LED (B) (lighting device), and 38c denotes LE.
D (C) (lighting device), which is used to display light when the device is tilted by a predetermined amount, and as a guide when leveling the device. These LEDs 38a, 38b, 38
c is 12 around the power supply confirmation LED 37
It is arranged so as to form a central angle of 0 degree, and the flange 22
a, 22b, and 22c are provided corresponding to the formation positions.

FIG. 5 shows a circuit configuration of the earthquake detecting apparatus.
It will be described based on. In FIG. 5, reference numeral 40 denotes the aforementioned C
An arithmetic processing circuit 41 formed by the PU board 32 or the like;
Is a control unit, 42 is the SI value calculated by the SI value calculation unit 42a, the seismic intensity calculated by the seismic intensity calculation unit 42b, the acceleration calculated by the acceleration calculation unit 42c,
This is a calculation value selecting unit that selects any plural calculation values from the respective calculation values of the displacement amount calculated by the displacement amount calculation unit 42d and the speed calculated by the speed calculation unit 42e. That is, the calculated value selecting means 42 is to provide an optimum setting at the installation site by appropriately combining various arithmetic functions as needed.

Reference numeral 43 denotes a calculated value determining means for determining whether or not to output an emergency shutoff instruction based on the calculated value.
This is a memory composed of an EPROM or the like.
A threshold value for determination required by the calculated value determination means 43 and output data of each axis when there is no vibration at the time of adjustment at a factory or the like are recorded in advance as initial data. The shutoff instruction is
It is configured to be output to the outside via a relay interface 53 described later. For example, when the calculated value judging means 43 decides to shut off, the electromagnet inside the relay is excited by a relay drive circuit (not shown), and the normally open contact is closed to output to the outside.

45 is a real-time clock, 46 is a sensor interface, 47 is a temperature sensor for correction, 48 is a reference voltage, 49 is a power supply circuit, 50 is a backup circuit,
1 is a digital output interface, and 52 is a digital input interface. Reference numeral 53 denotes a relay interface that outputs a calculation processing result as a relay contact output signal instead of a digital signal. This relay interface 53
Is configured to be able to directly connect circuits such as DC 24 volts and AC 100 volts, and can directly operate various loads such as actuators, valves, and large relays. . Also, a normal electric circuit or an electronic circuit may be used as a load and driven on / off by a relay. The relay interface 53 and a contact-side circuit (not shown) are electrically separated from each other. The relay interface 53 can be connected not only to a relay but also to an isolated and insulated electric component such as a photocoupler or a photomos relay.

Reference numeral 54 denotes an analog output interface;
Is a loader interface for connecting a not-shown portable setting device for supplying a setting signal for causing the calculated value selecting means 42 to select a calculated value, and includes the loader connection terminal 36 described above. Note that setting means using such a portable setting device includes, for example, Japanese Patent No. 2523053.
The means disclosed in Japanese Patent Application Laid-Open Publication No. H10-26095 can be used. Wiring from an external power supply to the power supply circuit 49 and each interface 5
1, 52, 53, and 54 are the same as those of the shield wire 2 described above.
4 is drawn out of the explosion-proof case 20.

Next, the tilt adjusting means will be described with reference to FIGS.
It will be described based on. Here, FIG. 6 is a perspective view showing the tilt adjusting mechanism, FIG. 7 is a sectional view taken along line BB of FIG. 6, and FIG.
9 is a schematic diagram showing an output component of the semiconductor acceleration sensor, and FIG. 10 is a block diagram showing a circuit configuration of the inclination adjusting means. 6 to 8, reference numeral 70 denotes a fixing bracket which is inserted into a floor embedding bolt 72 embedded in the floor 71 and is fixed to the floor 71 with a fixing nut 73. The fixing bracket 70 presses the flange 22 a downward. Have. Numeral 74 denotes a tilt adjusting screw (tilt adjusting mechanism) having a hexagonal hole on the upper surface, which is screwed into a screw hole 23 provided through the flange 22a, and the amount of screwing is adjusted to adjust the amount of screwing of the flange 22a to the floor 71. The vertical position is adjusted to correct the inclination of the device. Such a tilt adjusting mechanism is similarly provided for the flanges 22b and 22c.

Next, a method of detecting the inclination will be described. (1) When mounted horizontally as shown in FIG. 13, when viewed from the XZ axis plane, the direction of the Z axis (positive) (vertical downward direction)
Is applied to the earth gravity, that is, 980 gal. Therefore, no output is output on the X axis. Similarly, there is no output on the Y-axis when viewed on the YZ-axis plane. 980 gal × Cos (90 degrees) = 0 (2) As shown in FIG. 14, when tilted in the X-axis (positive) direction 980 gal × Cos θx in the X-axis (positive) direction T = X-axis (positive) output (Xout) ) = Vx output. Actually, since Xout is detected, the inclination angle θx is set to Co
sθx = Xout / 980. (3) When tilted in the X-axis (negative) direction, the output Vx is output in (2) and the X-axis (negative) direction.

(4) The same applies to the Y axis. (5) The same applies to the case where the XY output is tilted in the middle direction between the X axis and the Y axis, and the XY output can be decomposed as in the above (2), (3) and (4). That is, when the device is normally set horizontally, no output is produced in the X and Y axis directions. If there is an output on the X-axis or the Y-axis, it is tilted, and the LED in that axis direction may be turned on or off. For example, if the inclination is up to 2 degrees (90-2 = 88 degrees), X,
It suffices that both the Y-axis and the Y-axis are blinked until 980 × Cos (88 degrees) = 34 gal or less. (6) In FIG. 9, when the output Vx exists in the X-axis (positive) direction, the LED (C) 38c is turned on or blinks. (7) If there is an output on the X axis (positive) and Y axis (positive), L
The ED (B) 38b and (C) 38c are turned on or off. (8) If there is an output only on the Y axis (negative), LED (A) 3
8a is turned on or blinks.

In FIG. 10, reference numeral 75 denotes a tilt calculating means for calculating the tilt of the apparatus from the X-axis and Y-axis outputs of the semiconductor acceleration sensor 30 for obtaining the above-mentioned Va, Vb, Vc and the like. 76 determines which flange 22a, 22b, 22c the inclination should be corrected based on the calculation result of the tilt calculator 75, and determines whether to turn on the LEDs 38a, 38b, 38c corresponding to the flange 22 to be corrected. (Lighting judgment means (judgment display means).

This lighting determination means 76 is used when the inclination of the device is large (for example, when the inclination of each axis is 10 degrees or more).
Is LE corresponding to the flange position where the inclination is increased.
D38a, 38b, and 38c are turned on, and blink when the inclination of the apparatus is within a predetermined range (for example, a range from 10 degrees to 2 degrees). Then, as the inclination of the device becomes smaller, the blinking interval is made longer to indicate that the inclination adjustment is normally performed, and further, when the final adjustment range (for example, less than 2 degrees) is reached, the light is completely turned off and the inclination is turned off. It is formed so that it can display that the adjustment is completed. In addition,
The inclination calculating means 75 and the lighting determination means 76 can be provided in the control unit 41 described above.

Reference numeral 77a denotes a lighting circuit (A) for lighting the LED (A) 38a based on the determination result of the lighting determination means 76, and reference numeral 77b denotes lighting for lighting the LED (B) 38b based on the determination result of the lighting determination means 76. Circuit (B), 7
7c is an LED based on the determination result of the lighting determination means 76.
(C) is a lighting circuit (C) for lighting 38c.

Next, the operation will be described. First, a method for adjusting the inclination of the apparatus will be described. Each of the flanges 22 a, 22 b, 22 c of the explosion-proof case 20 is fixed to a floor embedding bolt 72 of a floor 71 by a fixing bracket 70 and a fixing nut 73. At this time, the inclination adjusting screw 74 provided on each of the flanges 22a, 22b, and 22c keeps the height of the flange of the earthquake sensor at the lowest level, and the flanges are in close contact with the floor 71. That is, the tilt adjusting screw 74 is operated in a direction to increase the tilt.

The semiconductor acceleration sensor 30 detects the installation state and sends the X-axis and Y-axis outputs to the inclination calculating means 75.
Then, the inclination calculating means 75 calculates the above-mentioned Va, Vb, Vc
Is obtained and output to the lighting determination means 76. in this case,
The highest position of the flange 22 is set as a starting point, and the LED 38 corresponding thereto is turned off in advance so that the lower position of the flange 22 can be detected.

When the inclination of the device is large (for example, when the inclination of each axis is 10 degrees or more), the lighting determination means 76 determines the low position where the inclination is large based on the calculation result of the inclination calculation means 75. LED 38a corresponding to the flange of
To turn on 38b, 38c, the corresponding lighting circuit 7
7a, 77b and 77c are operated. When the inclination of the device is within a predetermined range (for example, a range from 10 degrees to 2 degrees), the corresponding LEDs 38a, 38b,
38c blinks.

The operator can grasp the position and the adjustment amount of the flange 22 whose inclination is to be adjusted by turning on or off the LED 38, and screw the inclination adjusting screw 74 of the corresponding flange 22 to raise the height of the flange 22. Raise.

As described above, when the apparatus is leveled and the inclination becomes gradually smaller, the blinking interval of the LED 38 becomes longer. Thereby, the operator can easily grasp that the tilt adjustment is performed normally. When the final adjustment range (for example, less than 2 degrees) is reached, the LED 38 is completely turned off, indicating that the tilt adjustment has been completed. Thereby, the operator can easily grasp that the inclination adjustment has been completed. The same is true even if the lighting and blinking are reversed.

As described above, at the time of installation or maintenance of the apparatus, the operator can easily grasp the flange 22 whose inclination is to be adjusted and the adjustment amount thereof by displaying the LED 38, and perform the leveling operation of the apparatus. Can be performed easily and quickly.

Note that the horizontal adjustment is performed at three points,
Since the output of the axis and the Y-axis are sequentially affected, the adjustment of the inclination of one flange 22 is completed, and the LED 38 which has been turned off after the adjustment is completed may be turned on again while the other flange 22 is being adjusted. is there. Also in this case, the leveling operation can be easily completed by appropriately repeating the adjustment of each part in the manner described above.

The leveling operation can be started only when an operator connects a portable setting device (not shown) to the loader connection terminal 36 at the installation site and communicates with the loader. When the leveling operation of the device is completed, output data of the semiconductor acceleration sensor 30 is recorded, and the data can be used as an initial value at the time of installation. That is, after the output is set to zero, measurement for detecting an earthquake is started.

Next, the operation of earthquake detection will be described. 5 and 1, when the semiconductor acceleration sensor 30 detects an earthquake, the detection signal is transmitted to the sensor interface 46.
Is input to the control unit 41 via the. In this case, since the semiconductor acceleration sensor 30 can measure three axes (X, Y, and Z axes), it is possible to more accurately measure the vibration of earthquake motion. In particular, in the case of a direct earthquake, more important measurement information can be obtained because the Z-axis (vertical) direction vibrates first.

In the control unit 41, the SI value, seismic intensity, etc., which are selected in advance by the calculation value selection unit 42, are stored in each arithmetic unit 4.
It is calculated by 2a to 42e. The setting signal for causing the calculated value selecting means 42 to select a calculated value is determined by an operator by connecting a portable setting device (not shown) to the loader connection terminal 36 at the installation site and performing loader communication, thereby setting an optimum threshold value for the installation site. Can be set easily and quickly.

The judging means 43 judges whether or not to output an emergency shutoff instruction based on the calculated value. If the emergency shutoff instruction is to be output, for example, the judgment circuit 62 of the control panel 60 is sent from the relay interface 53. And the relay signal 57
Is output as Therefore, even if the shield wire 24 is routed from the governor chamber 11 to the control panel 60, it becomes strong against noise and does not malfunction. In this case, more reliable detection can be expected, for example, by outputting a shutoff instruction signal when both the SI value and the seismic intensity exceed a predetermined value.

Then, the relay signal 57 is input to the determination circuit 62 of the control panel 60 as shown in FIG. On the other hand, the output of the mechanical earthquake sensor 61 is also input to the determination circuit 62.

In the judgment circuit 62, these relay signals 57
When both the output signal and the output signal of the mechanical seismic sensor 61 are output, it is determined as a logical product, and a shutoff signal 63 is generated, and a governor drive circuit (not shown) controls the governor 12.
Is shut off. That is, the supply of gas to the low-pressure conduit 64 is shut off urgently, so that it is possible to effectively prevent an increase in damage due to gas leakage and the occurrence of a secondary disaster. In this determination circuit 62, a shut-off signal 63 is provided for ensuring safety during an earthquake.
May be determined as a logical sum of the relay signal 57 and the output signal of the mechanical earthquake sensor 61.

As described above, according to the first embodiment, the operator can easily grasp the flange 22 whose inclination is to be adjusted and the adjustment amount thereof by displaying the LED 38, and can perform the leveling operation of the apparatus. An effect that can be performed easily and quickly is obtained. In particular, LE is used as an inclination display means.
Since the configuration is made using the D38, an effect that a display easily understood by the operator can be realized in a small size and at low cost can be obtained.

The use of the small semiconductor acceleration sensor 30 also allows the arithmetic processing circuit 40 to be used in the explosion-proof case 2.
0 and can reduce the size and weight of the entire device.
An effect that can be easily handled is obtained. Further, since the emergency cutoff instruction from the arithmetic processing circuit 40 is output as the relay signal 57, the reliability against noise is remarkably improved, and an effect that the malfunction of the device can be effectively prevented can be obtained.

Further, since the semiconductor acceleration sensor 30 can measure three axes (X, Y, and Z axes), it is possible to measure vibration of earthquake motion more accurately. In particular, a direct type earthquake in which the Z axis (vertical) direction vibrates first. Thus, an effect that more important measurement information can be obtained is obtained. Further, the calculated value selecting means 42 can arbitrarily calculate the SI value required by the gas industry, the seismic intensity required by the Japan Meteorological Agency, and the displacement / speed required by the construction industry, so that the number of product models or the product Even if it is necessary to change the delivery destination, each threshold value, the amount of measurement, and the like, the effect of easily and flexibly responding can be obtained.

Further, for example, by configuring so as to output a warning signal when both the SI value and the seismic intensity exceed a predetermined value, an effect that a more reliable detection can be expected can be obtained. Further, the setting signal for causing the calculated value selecting means 42 to select the calculated value is transmitted by the operator by connecting a portable setting device (not shown) at the installation site to the loader connection terminal 36 and communicating with the loader, thereby obtaining the ground or building at the installation site. The effect that the optimum threshold value can be easily and quickly set is obtained.

In the first embodiment, the LED 38 is turned on in accordance with the tilt amount of the device, for example, in the range of 10 degrees or more, in the range of 10 degrees to 2 degrees, and in the range of less than 2 degrees.
Although it has been described as blinking and turning off, the present invention is not limited to this. Also, LED 38 is used as a tilt indicator
Although it has been described that three are provided, the present invention is not limited to this, and four or more may be provided. Further, a seven-segment LED, a light bulb, or other display means can be used as the tilt indicator.

Embodiment 2 FIG. 11 is a perspective view showing a tilt adjusting mechanism of the earthquake detecting device according to the second embodiment of the present invention, and FIG. 12 is a side view showing the tilt adjusting mechanism viewed from the direction of arrow D in FIG. The same members as or members corresponding to those described in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted or simplified.

In FIGS. 11 and 12, reference numeral 22 denotes four flanges provided at the lower end of the outer peripheral surface of the explosion-proof case 20, and reference numeral 38 denotes four LEDs provided at positions corresponding to adjustment bolts 82 described later. It is formed so as to be lit by four lighting circuits (not shown).
This lighting circuit is formed so as to be controllable by the above-mentioned lighting determination means 76. Reference numeral 80 denotes a substrate fixed to the floor 71 by anchor bolts 81, reference numeral 82 denotes four adjustment bolts (tilt adjustment mechanisms) erected by welding or the like on the substrate 80, and reference numeral 83 denotes an adjustment plate (tilt adjustment) for mounting and fixing the explosion-proof case 20. Mechanism), and is movably attached to an axial direction of the inserted adjustment bolt 82 by an adjustment nut (tilt adjustment mechanism) 84. Reference numeral 85 denotes a fixing bolt for fixing each flange 22 of the explosion-proof case 20 to the adjustment plate 83. The other configuration is the same as that of the first embodiment, and the description is omitted.

Next, the operation will be described. As in the case of the first embodiment, the operator grasps the degree of inclination of the adjustment plate 83 by turning on or blinking each LED 38. Then, the adjusting nuts 84 of the adjusting bolts 82 located at the four corners of the adjusting plate 83 are moved up and down as appropriate to make the adjusting plate 83
Is adjusted, and the apparatus is leveled until the LED 38 is turned off. In this case, more detailed leveling can be performed by displaying the four LEDs 38. Other operations are the same as those in the first embodiment, and a description thereof will not be repeated.

As described above, according to the second embodiment, the operator can display the four LEDs 38 to display the adjustment plate 8.
The degree of inclination of 3 and the amount of adjustment thereof can be easily grasped, and an effect that the leveling operation of the apparatus can be performed easily, quickly, and more finely can be obtained.

[0053]

As described above, according to the first aspect of the present invention, the acceleration sensor, the inclination adjusting mechanism, the inclination display, the inclination calculation means, and the judgment display means are provided. The operator can easily grasp the tilt adjusting mechanism whose tilt is to be adjusted and the adjustment amount by the display of the tilt indicator, and the leveling operation of the apparatus can be performed easily and quickly.

According to the second aspect of the present invention, a lighting device that can be turned on and off is used as the tilt indicator, and the degree of tilt of the device is displayed by a combination of the lighting and the turning off. There is an effect that a display with a tilt that is easy for the user to understand can be realized in a small size and at low cost.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a gas supply system using an earthquake detection device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an earthquake detection device.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a plan view showing a state where a cover of the earthquake detection device is removed.

FIG. 5 is a circuit configuration diagram of the earthquake detection device.

FIG. 6 is a perspective view showing a tilt adjusting mechanism.

FIG. 7 is a sectional view taken along line BB of FIG. 6;

FIG. 8 is a sectional view taken along line CC of FIG. 6;

FIG. 9 is a schematic diagram showing output components of a semiconductor acceleration sensor.

FIG. 10 is a block diagram illustrating a circuit configuration of a tilt adjusting unit.

FIG. 11 is a perspective view showing an inclination adjusting mechanism of the earthquake detection device according to the second embodiment of the present invention.

FIG. 12 is a side view showing the tilt adjusting mechanism viewed from the direction of arrow D in FIG. 11;

FIG. 13 is an explanatory diagram of detection of inclination when the camera is mounted horizontally.

FIG. 14 is an explanatory diagram of detection of inclination in a case where the camera is mounted to be inclined.

[Explanation of symbols]

 22 Flange (tilt adjusting mechanism) 30 Semiconductor acceleration sensor (acceleration sensor) 38 LED (lighting device) 74 Tilt adjusting screw (tilt adjusting mechanism) 75 Tilt calculating means 76 Lighting determining means (determining display means) 82 Adjusting bolt (tilting adjusting mechanism) ) 83 Adjusting plate (tilt adjusting mechanism) 84 Adjusting nut (tilt adjusting mechanism)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Yanagita 2-12-19 Shibuya, Shibuya-ku, Tokyo Yamatake Ha Newel Co., Ltd. (72) Inventor Hiroyuki Furukawa 2-12-19 Shibuya Shibuya-shi, Tokyo Yamatake Inside Honeywell Co., Ltd. (72) Inventor Hikaru Takubo Inside 2-21-19 Shibuya, Shibuya-ku, Tokyo Inside Yamatake Honeywell Co., Ltd.

Claims (2)

[Claims] 1. An earthquake detecting apparatus comprising: an acceleration sensor for detecting accelerations in all directions in a horizontal plane; and an inclination adjusting mechanism for adjusting the inclination of the entire apparatus and fixing the apparatus at an installation location. A tilt indicator for displaying the tilt of the device, tilt calculating means for calculating the tilt of the device based on the detection signal of the acceleration sensor, and adjustment according to the tilt of the device calculated by the tilt calculating device. An earthquake detection apparatus comprising: a determination display unit that determines the tilt adjustment mechanism to be performed and displays the tilt on the tilt display corresponding to the tilt adjustment mechanism. 2. The earthquake detecting device according to claim 1, wherein a lighting device that can be turned on and off is used as the tilt indicator, and the degree of tilt of the device is displayed by a combination of the turning on and off.