JP3343015B2 - Seismic isolation system for control devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device disposed on a free access floor laid a predetermined distance above a base and a seismic isolation device for protecting a control target controlled by the control device from an earthquake. About the system.

[0002]

2. Description of the Related Art In a central control room such as a factory where a large number of control devices and monitoring devices are disposed, and in an office where various OA devices are disposed, a signal line and a power line are wired on the floor. In addition, the use of free access floors has been adopted to prevent the obstruction of walkers and office workers and to impair the aesthetics of the room.

[0005] More specifically, as shown in FIG. 5, a square plate 3 a is placed on a support frame 2 having a large number of squares formed of, for example, angles or blocks on a floor 1 of a building.
Are provided in a checkered pattern.

[0004] In a central control room of a factory or the like, for example, a control panel and an operation console 4 are installed on the free access floor 3, and a control device 5 is mounted on the operation console 4. Various signal lines and power supply lines for connecting the control device 5 and control objects such as various devices constituting a plant disposed outside the central control room are provided in the space between the floor 1 and the free access floor 3 of the building. Wired.

[0005] When an earthquake occurs, the control specification for the control target is changed from the normal control specification to the plant to prevent the occurrence of a shortage from the viewpoint of prevention of danger of the plant. The operation of the control target of each device to be stopped is stopped, the operation is maintained as it is, or the output of the device is set to a minimum, and the control specification is changed to an earthquake response control specification.

The seismic response control specification is defined in advance as an earthquake response operation manual, and an observer resident in the central control room operates a control device according to the earthquake response operation manual when an earthquake occurs.

[0007]

However, as described above, even in the method in which the observer manually changes the control specification of the control device from the normal control specification to the earthquake response control specification based on the earthquake response manual, There were still the following issues to be resolved.

That is, since the occurrence of an earthquake cannot be predicted,
If the observer was outside the central control room at the time of the earthquake, the control specifications of the control device would not be changed, and no measures could be taken.

Further, even if the observer is in the central control room, there is a problem that the raised access floor is shaken or upset, and the observer cannot operate the control device correctly according to the earthquake response operation manual. is there. For this reason, there arises a problem that the control device cannot correctly control the control target based on the earthquake-specific control specifications, and the control target is in an erroneous control state, which may cause an unexpected situation.

Further, when the free access floor vibrates greatly, there is a concern that the control device may slide or fall on the operation console, or may slide down from the operation console. As a result, there is a concern that the control device itself may be damaged. If the control device itself is damaged, an erroneous control command is output from the control device to the control target, so that the operation of the control target shifts to an abnormal operation state other than the normal control specification or the earthquake response control specification. There are concerns.

Therefore, the reliability of the whole plant including the control target is reduced. The present invention has been made in view of such circumstances, and by arranging a floor seismic isolation device between a base and a free access floor, when an earthquake occurs, control of a control target is performed from a normal control specification by an earthquake. An object of the present invention is to provide a seismic isolation system for a control device which can smoothly shift to a corresponding control specification, protect the control device, and prevent an unexpected situation caused by an earthquake from occurring in a control target.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a control device for protecting a control device for controlling the operation of a controlled object from an earthquake, which is disposed on a free access floor laid a predetermined distance above a base. Applies to seismic isolation systems.

In order to solve the above-mentioned problems, a seismic isolation system for a control device according to the present invention includes a vibration sensor for detecting vibration of a free access floor, and a vibration value of the free access floor detected by the vibration sensor. Is greater than the specified vibration value, it is inserted between the base and the free access floor to output the earthquake occurrence information, and responds to the earthquake occurrence information output from the earthquake detection device. In accordance with the seismic isolation device that suppresses the transmission of vibration to the access floor and the control device, and in response to the earthquake occurrence information output from the earthquake detection device, the control specifications for the control target are changed to the specified earthquake response control specifications. Bei and a control specification changing means for changing Etei
You.

Further, a strain sensor for detecting the vibration of the control device, and when the vibration value of the control device detected by the strain sensor is set to be larger than the specified vibration value, exceeds the seismic resistance value of the control device itself. An emergency stop control device for outputting emergency stop information, emergency stop processing means provided in the control device, and performing a predetermined emergency stop process in response to the emergency stop information output from the emergency stop control device; In response to the emergency stop information output from the stop control device, there is provided a power shutoff means for shutting off power to the control device after a predetermined time exceeding the emergency stop processing time .

Further, in another invention, an alarm output means is provided in the control device for outputting an alarm of the earthquake occurrence information in response to the earthquake occurrence information output from the earthquake detection device.

In the seismic isolation system of the control device configured as described above, when an earthquake occurs, the vibration of the earthquake is detected by a vibration sensor, and when the detected value of the vibration exceeds a specified value, the earthquake detecting device generates an earthquake. Information is sent to the floor isolation device and the control device. As a result, vibration of the free access floor is suppressed.

When the occurrence of an earthquake is detected, the control device changes the control of the control target from the normal control specification to the earthquake-responsive control specification. In this case, since the vibration of the free access floor is suppressed by the floor seismic isolation device, excessive vibration is not applied to the control device. Therefore, even if an earthquake occurs, the control device can surely change the control specification for the control target to the earthquake-compatible control specification, and shift the control target to an operation state corresponding to the occurrence of the earthquake.

Further, a distortion sensor for detecting vibration is attached to the control device itself. And when the magnitude of the earthquake increased, it exceeded the floor isolation capacity of the floor isolation device,
The free access floor itself will vibrate greatly. In this case, the control device also vibrates greatly. In this state, the control device itself cannot maintain normal operation.

When the detected value of the distortion sensor exceeds the limit value of the control device itself, the control device executes an emergency stop process for urgently stopping the control operation on the control target, and then shuts off the power. Therefore, an erroneous control command is not transmitted to the control target from the control device when an earthquake occurs. Further, in another invention, when an earthquake occurrence is detected by the earthquake detection device, the earthquake occurrence information is output to a printer or a storage device, and the occurrence history is recorded and held.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 2 is a schematic diagram showing a schematic configuration of a seismic isolation system of a control device according to a first embodiment of the present invention.

On a floor 11 of a building as a foundation, a free access floor 13 is provided in which square plates 13a are laid out in a checkered pattern on angles 12 laid in a grid pattern, for example.

Between the floor 11 of the building and the free access floor 13, vibrations such as earthquakes are generated from the floor 11 to the free access floor 1.
A floor seismic isolation device 14 that suppresses transmission to 3 is interposed. The floor seismic isolation device 14 is composed of, for example, a hydraulic device, and detects the vibration waveform of the floor 11 and applies a waveform having the opposite phase of the vibration waveform to the hydraulic device, thereby reducing the vibration of the floor 11. It has a function of suppressing transmission to the free access floor 13 placed on the hydraulic equipment.

The pillar 1 fixed to the floor 11 of the building
A cushioning member 16 is filled between the space 5 and the free access floor 13. On the free access floor 13, a vibration sensor 17 composed of, for example, an acceleration clock for detecting the vibration of the free access floor 13 is mounted. And
A vibration signal (vibration b) output from the vibration sensor 17
Is sent to the next earthquake detection device 18. Earthquake selection device 1
8, the signal level of the vibration signal from the vibration sensor 17 is converted into a vibration value of the seismic Galle, when the vibration value reaches the predetermined vibration value A ₁ corresponding to, for example, about seismic intensity 2, earthquake there is determined And outputs the earthquake detection information c.

[0024] It should be noted that when the vibration value is less than the predetermined vibration value A _1, in particular, it is determined that there is no need to take anti-earthquake measures, does not output the earthquake detection information c. An operation console 19 is mounted on the free access floor 13, and a control device 20 including an information processing device such as a computer is fixed on the operation console 19, for example. Further, a printer 21 is mounted on the operation console 19 at a position adjacent to the control device 20. A distortion sensor 22 is attached to a housing of the control device 20.

The control device 20 and the free access floor 13
The signal lines and the power supply lines connecting the control objects such as various devices constituting the plant, which are installed in a place other than the central control room where is installed, are wired in the space between the floor 11 and the free access floor 13 of the building.

FIG. 1 is a block diagram showing a schematic configuration of the seismic isolation system of the control device according to the first embodiment. In the control device 20, hardware components such as a CRT display device 23, a power supply circuit 24, etc., and a control arithmetic processing unit 25, an alarm output unit 26, a control specification change unit 27, an emergency stop process, which are configured on an application program. The section 28 and the like are housed.

The power supply circuit 24 converts an AC voltage of, for example, 100 V supplied from an external commercial power supply 29 to a DC drive voltage Vd.
And supplies it to each unit in the device. In the normal case where the specification change command d to the earthquake-specific control specification is not input from the control specification change unit 27, the control arithmetic processing unit 25 operates from the control target 30 such as various devices disposed outside the central control room. By taking in the process value PV indicating the state, performing control calculation based on a predetermined normal control specification, and applying the calculation result to the control target 30 as the manipulated variable MV, the corresponding control target 30 Is controlled to a state based on normal control specifications.

When the control change processing unit 25 receives a specification change command d for changing to an earthquake control specification from the control specification change unit 27, the control calculation unit 25 changes the control specification based on the earthquake control control specification.
The operation state of the control target 30 is controlled to a state based on the control specifications at the time of the occurrence of the earthquake.

Specifically, the operation of the controlled object 30 is stopped, the operation is maintained as it is, or the output is set to the minimum, and the controlled object 30 falls into an unexpected situation due to the occurrence of an earthquake. Is prevented beforehand.

The control specification changing unit 27 is provided for the earthquake detecting device 18.
When it receives the earthquake occurrence information c output from, it sends a specification change command d to the earthquake response control specification to the control arithmetic processing unit 25.

The strain sensor 22 affixed to the housing of the control device 20 detects the stress distortion caused by the vibration of the housing of the control device 20 and outputs the next emergency stop control device 3 as a distortion signal.
Send to 1.

The emergency stop control device 31 includes the strain sensor 22
Is converted into a vibration value applied to the control device 20 itself, and this vibration value is
As soon as it exceeds a predetermined earthquake resistance value A ₂ , it immediately sends an emergency stop command f to the emergency stop processing unit 28 in the control device 20. Further, sends the required time power-off command from the longer the predetermined time T ₁ elapses after the power supply circuit 24 of the emergency stop processing from the transmission time of the emergency stop command f.

When the emergency stop processing unit 28 receives the emergency stop command f, the emergency stop processing unit
After executing the emergency control process for urgently stopping the operation of No. 0, the control unit 20 is caused to execute an emergency stop process such as storing and holding various control information at this time, and shifts the entire control device 20 to a power-off standby state. Let it.

When the power supply cutoff command is input from the emergency stop control device 31, the power supply circuit 24 cuts off the AC voltage supplied from the commercial power supply 29 to itself. Therefore, the drive voltage Vd supplied to each section is also cut off.

[0035] Next, <br/> be described with reference to a time chart showing the operation of the seismic isolation system thus configured control device in FIG. During a period before the time t _{0 in} which no earthquake occurs, the control calculation processing unit 25 of the control device 20 controls the operation of the control target 30 according to a normal control specification.

Then, it is assumed that, for example, at time t _{0, an} earthquake has occurred and the floor 11 of the building has vibrated with the vibration waveform indicated by the floor vibration a in the figure. At the time of occurrence of the earthquake t ₀ , the floor seismic isolation device 14 is in a stopped state, so that the floor vibration “a” of the floor 11 is transmitted to the free access floor 13 as it is. Therefore, the free access floor vibration b detected by the vibration sensor 17 installed on the free access floor 13 substantially matches the floor vibration a.

When the vibration of the earthquake increases, the floor vibration b of the free access also increases as the floor vibration a increases. When the vibration value of the free access floor vibration b reaches the above-mentioned specified vibration value A ₁ at time t ₁ , the earthquake detection information c is sent from the earthquake detection device 18 to the floor seismic isolation device 14 and the control device 20. As a result, as shown by e in the figure, the floor seismic isolation device 14 is activated, and the vibration of the floor 11 is changed to the free access floor 13.
Therefore, the vibration value of the free access floor vibration b is greatly suppressed as compared with the vibration value of the floor vibration a.

Further, the earthquake detection information c input to the control device 20 is input to the control specification changing unit 27 and the alarm output unit 26. As a result, the control specification change command d is input from the control specification change unit 27 to the control calculation processing unit 25, and thereafter, the control target 30 is controlled based on the earthquake-specific control specification.

At the same time, the alarm output unit 26 is connected to the CRT display 2
3, a warning message of the earthquake occurrence information is displayed and output, and the earthquake occurrence information is printed out together with the occurrence time on the printer 21.

Further, when the vibration of the earthquake increases, the time t
When the vibration of the strain vibration g of vibration is detected by the strain sensor 22 increases the raised floor 13 which is base-isolated control at ₂ exceeds the seismic value A ₂ of the control device 20 itself, the emergency stop control unit An emergency stop command f is output from the control unit 31 and the emergency stop control processing unit 28 is started, and the control operation processing unit 2
Then, an emergency stop process h for Step 5 is executed.

Then, a time t ₃ at which a predetermined time T ₁ obtained by adding a certain margin time to the time required for the emergency stop processing h has elapsed.
, The power supply of the power supply circuit 24 is cut off, and the control device 20 stops operating.

When the earthquake stops before the vibration value of the strain vibration g detected by the strain sensor 22 exceeds the seismic resistance value A ₂ of the control device 20 itself, the earthquake detection information output from the earthquake detection device 18 is output. Since c is released, the control specification changing unit 27 returns the control specification of the control arithmetic processing unit 25 to the original control specification at the time of normal operation. As a result, the control target 30 returns to the original normal operation state.

In the seismic isolation system of the control device configured as described above, when an earthquake occurs, the vibration sensor 17 detects the free access floor vibration b on the free access floor 13 caused by the earthquake, and the detected value becomes the specified value. It becomes the a ₁ or more, is sent from the seismic detector 18 to earthquake information c floor isolator 14 and the controller 20.

As a result, the vibration of the free access floor 13 is suppressed. The control target 30 in the control device 20
Is changed from the normal control specification to the earthquake response control specification. In this case, since the vibration of the free access floor 13 is suppressed by the floor seismic isolation device 14,
No excessive vibration is applied to the control device 20.

Therefore, even if an earthquake occurs,
The control device 20 can surely change the control specification for the control target 30 to the earthquake-compatible control specification, and shifts the control target 30 to an operation state corresponding to the occurrence of an earthquake. Therefore, it is possible to prevent the operation state of the control target 30 from being inadvertently caused by the occurrence of the earthquake, and to improve the safety of the entire plant.

Further, since the control specification for the control target 30 is automatically changed to the earthquake response control specification, the work load on the observer at the time of the occurrence of an earthquake is greatly reduced.
Since no human operation error occurs, the reliability of the system can be further improved.

Further, a distortion sensor 22 for detecting vibration of the control device 20 itself is attached to the control device 20. The scale of the earthquake increases, gone beyond the floor license contents vibration value of the floor isolator 14, and large vibration is raised floor 13 itself exceeds the limit value A ₂ of the control device 20 itself, After the control device 20 performs an emergency stop process for urgently stopping the control operation on the control target 30, the power is shut off.

Therefore, since an erroneous dangerous control command (operating amount MV) is not transmitted to the control target 30 from the control device 20, the safety of the plant including the control target 30 can be further improved.

Further, when an earthquake occurrence is detected by the earthquake detection device 18, the alarm output section 26 in the control device 20 is activated, and this earthquake occurrence information is output to the printer 21 and the CRT display device 23, and the occurrence history is output. Is stored.

(Second Embodiment) FIG. 4 is a schematic diagram showing a schematic configuration of a seismic isolation system of a control device according to a second embodiment of the present invention. The first shown in FIG.
The same parts as those of the seismic isolation system of the control device of the embodiment are denoted by the same reference numerals. Therefore, the detailed description of the overlapping part is omitted.

In the second embodiment, FIGS.
From the seismic isolation system of the first embodiment shown in FIG.
2. The emergency stop control unit 31 and the emergency stop processing unit 28 in the control unit 20 are removed.

Even in the seismic isolation system of the control device having such a configuration, a large or small-scale earthquake having a seismic intensity of about 3 to 4 is not used for a huge earthquake in which a building is inclined.
During the period when the floor seismic isolation device 14 is suppressing the vibration of the free access floor 13, the control device 20 controls the control target 30 based on the seismic response control specification, so that the safety of the entire plant can be sufficiently ensured.

[0053]

As described above, in the seismic isolation system of the control device according to the present invention, the floor seismic isolation device is disposed between the base and the free access floor, and the control specification for the control target in the control device is provided. Are provided separately for the normal control specification and the earthquake response control specification. Therefore, when an earthquake occurs, the control of the control target can be automatically shifted from the normal control specification to the earthquake response control specification, reducing the operation burden on the supervisor, protecting the control device itself, and providing the control target with unpredictable Can be prevented from occurring beforehand, and the safety of the entire plant incorporating the control object against earthquake can be further improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a seismic isolation system of a control device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a schematic configuration of a seismic isolation system of the control device.

FIG. 3 is a time chart showing the operation of the control device when the earthquake occurs in the seismic isolation system.

FIG. 4 is a schematic diagram showing a schematic configuration of a seismic isolation system of a control device according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a structure of a general control device and a raised floor;

[Explanation of symbols]

11 floor, 13 free access floor, 14 floor seismic isolation device, 17 vibration sensor, 18 earthquake detection device, 19 operation console, 20 control device, 21 printer, 22 strain sensor, 23 CRT Display device, 24 ... power supply circuit, 25 ...
Control arithmetic processing section, 26 ... Alarm output section, 27 ... Control specification changing section, 28 ... Emergency stop processing section, 29 ... Commercial power supply, 30 ...
Control target, 31 ... Emergency stop control device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04F 15/18 601 H05K 10/00

Claims (2)

(57) [Claims] 1. A seismic isolation system for a control device provided on a free access floor laid a predetermined distance above a base and protecting a control device for controlling the operation of a control target from an earthquake, A vibration sensor that detects vibration of the floor, a seismic detection device that outputs earthquake occurrence information when a vibration value of the free access floor detected by the vibration sensor is equal to or greater than a prescribed vibration value, the base and the free access floor And a floor seismic isolation device that is interposed between the base stations and responds to the earthquake occurrence information output from the earthquake detection device and that suppresses vibration transmission from the base to the free access floor. is, in response to earthquake information output from the seismic detector, and a control specification changing means for changing a control specification for the control target to a predetermined seismic response control specifications, A strain sensor for detecting vibration of the serial controller, the vibration value of the detected controlled device in the strain sensor is the Regulations
Seismic resistance of the control unit itself set to a value larger than the constant vibration value
Emergency stop control device that outputs emergency stop information when the
And the emergency stop control device provided in the control device,
In response to the output emergency stop information, predetermined emergency stop processing is performed.
Emergency stop processing means for executing processing, and responding to emergency stop information output from the emergency stop control device.
After a predetermined time exceeding the emergency stop processing time.
A seismic isolation system for a control device, comprising: a power cutoff unit that cuts off power to the control device. Wherein provided in the control device, wherein in response to earthquake information output from the earthquake detecting apparatus, the claims including an alarm output means for outputting warning the earthquake information
2. The seismic isolation system of the control device according to 1 .