JPH1171946A - Abnormality decision device for automatic lock type door and controller at abnormal time - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an abnormality decision device capable of easily specifying an abnormal place and a controller capable of continuing the operation of an equipment without stopping control even when abnormality is generated in one position sensor in an automatic lock type door. SOLUTION: The abnormality decision dvice has a lock-position sensor 20 detecting the place of the lock of a lock means 10 and a release-position sensor 21 detecting the place of release, and the position sensor, in which the output signals of on → off or off → on are not changed, is decided as abnormality when a lock-means driving device 19 is worked. When the lock-means driving device 19 is operated, the abnormality of the lock-means driving device 19 is decided when the output signals of on → off or off → on are not changed in both position sensors 20, 21. When one position sensor in both position sensors 20, 21 is abnormal, the lock-means driving device 19 is controlled with time on the basis of the output signal of the other normal position sensor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-locking door, and is applied to a sterilizer, a vacuum cooler and the like.

[0002]

2. Description of the Related Art Automatic locking doors used in sterilizers are:
A lock means for fixing the door to the main body, a lock means driving device for automatically driving the lock means, a lock position detection sensor for detecting a lock position of the lock means, and a release position detection for detecting a release position of the lock means The operation of the lock means driving device is automatically controlled based on the output signal from the sensor. That is, at the time of locking, the door is fixed to the main body by the locking means by operating the locking means driving apparatus, and the locking means driving apparatus is stopped based on the output signal from the lock position detection sensor. Also,
At the time of release, the locking device driving device is operated to release the locking device, and the locking device driving device is stopped based on the output signal from the release position detection sensor.

[0003]

In the above configuration,
If an output signal is not obtained from the lock position detection sensor or the release position detection sensor even when a predetermined time has elapsed when the lock means driving device is operated, it means that some abnormality has occurred. At this time, it is difficult to specify whether the lock device driving device has failed or whether the lock position detection sensor or the release position detection sensor has failed.
It is necessary to actually investigate the operating states of the lock means driving device, the lock position detection sensor and the release position detection sensor in detail. When such an abnormality occurs, an alarm is issued and control of the device must be stopped. When the control is stopped in a state where the lock means is in the lock position, the door remains in the closed state, and there is also a problem that the object to be sterilized in the sterilization chamber cannot be taken out.

[0004] The present invention relates to an abnormality determining device which can easily identify an abnormal portion in an automatic lock type door,
It is an object of the present invention to provide a control device capable of continuing operation of a device without stopping control even if an abnormality occurs in one of the position detection sensors.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a lock means for fixing a door to a main body, and a lock means driving device for automatically driving the lock means. A lock position detection sensor for detecting a lock position of the lock means, and a release position detection sensor for detecting a release position of the lock means. When the lock means drive device is operated, ON → OFF or OFF → ON
A first determining means for determining that the position detection sensor having no change in the output signal is abnormal, a locking means for fixing the door to the main body, and a locking means for automatically driving the locking means A lock position detection sensor for detecting a lock position of the lock means; and a release position detection sensor for detecting a release position of the lock means. When the lock means drive device is operated, ON → OFF or OFF A second feature is that a determination unit is provided for determining that the locking means driving device is abnormal when the output signal of ON is not detected by the two position detection sensors.

Further, the present invention includes a lock means for fixing a door to the main body, a lock means driving device for automatically driving the lock means, a lock position detecting sensor for detecting a lock position of the lock means, A release position detection sensor for detecting a release position of the lock means is provided. If one of the lock position detection sensor and the release position detection sensor is abnormal, an output signal of the other normal position detection sensor is used. A third feature is that a controller for controlling the time of the lock means driving device is provided, and the controller takes a time when the lock means makes one reciprocation starting from a position of a normal position detection sensor. A fourth feature is that it has a function of driving the lock means driving device for half the time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be applied to equipment having an automatic lock type door, such as a sterilizer or a vacuum cooler. The self-locking door of the present invention includes a locking means for fixing the door to the main body, and a locking means driving device for automatically driving the locking means. A door is connected to a rotating shaft provided on one side of the main body, and the door rotates about the rotating shaft to open and close. The other side of the main body is provided with a locking means and a locking means driving device, and the locking means fixes the door to the main body.

The locking means comprises, for example, a main body side insertion hole, a door side insertion hole and a lock pin, and inserts the lock pin in a state where the main body side insertion hole and the door side insertion hole are overlapped. Secure the door to the body. Further, the lock means driving device has a configuration in which a lock pin is automatically inserted and removed by a cam mechanism and an electric motor, for example.

A lock position detection sensor is provided at a lock position of the lock means, and a release position detection sensor is provided at a release position of the lock means. As these position detection sensors, for example,
Use limit switches and proximity sensors. ON → OFF or OF
A determination device is provided for determining that the position detection sensor having no change in the output signal of F → ON is abnormal. Further, when the lock device driving device is operated, if the output signal of ON → OFF or OFF → ON does not change from the two position detection sensors, the determining device determines that the locking device driving device is abnormal.
By providing such a determination condition, an abnormal part can be easily specified.

When one of the lock position detection sensor and the release position detection sensor is determined to be abnormal by the determiner, the controller locks the position based on the output signal of the other normal position detection sensor. The means drive is time controlled. That is, by operating the lock device driving device for a predetermined time based on the output signal of the normal position detection sensor, the lock device is moved to the opposite position where the position detection sensor determined to be abnormal is located. The locking means can be moved to an arbitrary position by appropriately selecting the time for operating the locking means driving device.

In the time control for moving the lock means to the position on the opposite side where the position detection sensor determined to be abnormal is located, the control time can be set in advance.
It can also be performed as follows. The time required for the lock means to make one reciprocation starting from the position of the normal position detection sensor is measured, and the lock means drive device is driven for half the time. As described above, when only one position detection sensor is abnormal, the operation of the device can be continued without stopping the control based on the output signal from the other normal position detection sensor. In addition, it is possible to eliminate the problem that the door remains closed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a steam sterilizer will be described below with reference to the drawings. A main body 1 having a sterilization chamber therein, and a door 2 provided on the front surface of the main body 1 so as to be openable and closable are provided. The object to be sterilized is accommodated in the sterilization chamber of the main body 1, steam is supplied, and heat sterilization is performed by the retained heat of the steam.
The door 2 is connected to the main body 1 by a rotation shaft 3 provided on one side of the main body 1. By rotating the door 2 about the rotation shaft 3, the front opening of the main body 1 is opened and closed. A packing 4 is provided between the main body 1 and the door 2.

A block member 5 is fixed to the other side of the main body 1, and the block member 5 is provided with a main body side insertion hole 6. The door 2 has an arm member 8 having a door-side insertion hole 7.
When the door 2 is closed, the arm member 8 is fitted into the block member 5, and the main body side insertion hole 6 and the door side insertion hole 7 are provided.
And overlap. The lock pin 9 is inserted into the main body side insertion hole 6 and the door side insertion hole 7, and the door 2 is hermetically fixed to the main body 1. In this embodiment, the lock means 10 is constituted by the main body side insertion hole 6, the door side insertion hole 7 and the lock pin 9.

The lock pin 9 is connected to a guide shaft 12 by a connecting plate 11.
The lock pin 9, the connecting plate 11, and the guide shaft 12 move up and down integrally. The lock pin 9 is connected to the connecting plate 11 with some freedom of swing. This is because the lock pin 9 is
In addition, this is for enabling smooth insertion and removal from the door side insertion hole 7. The guide shaft 12 is provided so as to penetrate the block member 5 and is installed so as to be slidable in the vertical direction. The guide shaft 12 is provided with a spring 13 between the lower surface of the block member 5 and the lock pin 8, the connecting plate 11.
And the guide shaft 12 is urged downward.

The operation of pulling the lock pin 9 upward is performed by the electric motor 14. The electric motor 14 is mounted on a pedestal 15 and fixed to a side surface of the main body 1. Electric motor 1
A disk 17 is connected to the rotating shaft 16 of the fourth member, and a roller 18 is rotatably fixed to an eccentric position of the disk 17. The roller 18 is engaged with the lower surface of the connecting plate 11 to form a so-called cam mechanism. That is, when the electric motor 14 rotates the disk 17, the rollers 18
Rise, the connecting plate 11 rises, and the lock pin 9 also rises at the same time, so that the lock pin 9 comes out of the door side insertion hole 7. In this embodiment, the electric motor 14, the disk 17 and the roller 18 constitute a lock drive 19.

When the lock pin 9 is inserted into the door-side insertion hole 7, the electric motor 14 is rotated in the reverse direction to return the roller 18 to the original position. Then, the lock pin 9 is lowered by the force of the spring 13. Should the electric motor 14 break down,
Even if a power failure occurs, the lock pin 9 is moved in the lock direction by the force of the spring 13 and is thus safe.

A lock position detection sensor 20 is provided at a lock position of the lock means 10, and a release position detection sensor 21 is provided at a release position of the lock means 10. In the illustrated embodiment,
A lock position detection sensor 20 is provided at the lowermost movement position of the lock means 10, and a release position detection sensor 21 is provided at the uppermost movement position, and the connecting plate 11 contacts the lock position detection sensor 20 and the release position detection sensor 21. It is configured to emit an output signal. A configuration is also possible in which a horizontal pin (not shown) is fixed to the lock pin 9, and the horizontal pin contacts the lock position detection sensor 20 and the release position detection sensor 21.

Which of the lock means driving device 19, the lock position detection sensor 20 and the release position detection sensor 21 has an abnormality is determined by the determiner 22 based on the following determination conditions. When an output signal that does not match the logic is detected (when both position detection sensors are outputting ON signals at the same time, when the lock device driving device 19 is operated, only the output signal of one of the position detection sensors changes) State, or a state in which the output signals of both position detection sensors do not change), the locking means driving device 19 is operated for a predetermined time (the electric motor 14 is rotated for a predetermined time), and the output signal changes from ON → OFF or OFF → ON. It is determined that the position detection sensor having the error is normal, and the position detection sensor having no change in these output signals is determined to be abnormal.

Further, when the locking means driving device 19 is operated, even if the time sufficient for the locking means driving device 19 to make one reciprocation (the electric motor 14 makes one rotation) elapses, it remains ON.
If there is no change in the output signal of → OFF or OFF → ON from either of the position detection sensors, it is determined that the locking means driving device 19 is abnormal (the electric motor 14 is abnormal).

When one of the lock position detection sensor 20 and the release position detection sensor 21 is determined to be abnormal by the determiner 22, control is performed based on the output signal of the other normal position detection sensor. The lock device driving device 19 is time-controlled by the device 23. That is, a predetermined time based on the output signal of the normal position detection sensor,
By actuating the locking device driving device 19, the locking device 10 is moved to the opposite position where the position detection sensor determined to be abnormal is located.

Although the control time can be set in advance, for example, the lock means 10 makes one reciprocation (the electric motor 14 makes one rotation) starting from the normal position of the position detection sensor, and makes one reciprocation (one rotation). ) Is measured, and the locking device driving device 19 is halved for this time.
Can be controlled to drive (drive the electric motor 14). By actually measuring the reciprocating time, the position of the lock unit 10 can be accurately controlled. In addition,
The determiner 22 and the controller 23 may be configured integrally.

In order to ensure higher safety, the lock position detection sensor 20 is normal and the release position detection sensor 2
The above control is performed only when 1 is abnormal, and when the release position detection sensor 21 is normal and the lock position detection sensor 20 is abnormal, the control may be stopped. By doing so, it is possible to reliably detect that the lock means 10 is at the lock position with the lock position detection sensor 20 and continue the operation of the sterilizer without stopping the control.

[0023]

According to the present invention having the above-described configuration, an abnormal portion can be easily specified, and the time required for the recovery operation can be greatly reduced. Also,
When only one of the position detection sensors is abnormal, the operation of the device can be continued without stopping the control based on the output signal from the other normal position detection sensor. Therefore, it is possible to solve the problem that the door remains closed.

[Brief description of the drawings]

FIG. 1 is an explanatory side view showing an embodiment of the present invention.

FIG. 2 is an explanatory plan view showing the plane of FIG. 1 (a determiner and a controller are not shown);

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Door 3 Rotating shaft 4 Packing 5 Block member 6 Main body side insertion hole 7 Door side insertion hole 8 Arm member 9 Lock pin 10 Locking means 11 Connecting plate 12 Guide shaft 13 Spring 14 Electric motor 15 Base 16 Rotation axis 17 circle Plate 18 Roller 19 Locking device drive device 20 Lock position detection sensor 21 Release position detection sensor 22 Judgment device 23 Controller

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shiraishi ▲ Taku ▼ ya Miura Kogyo Co., Ltd. 7 Horie-cho, Matsuyama-shi, Ehime

Claims (4)

[Claims] A lock means for fixing a door to a main body.
A lock position detecting sensor 20 for detecting a lock position of the lock unit 10; a lock position detecting sensor 20 for detecting a lock position of the lock unit 10;
0 when the lock means driving device 19 is actuated.
An abnormality determination device for an automatic lock type door, comprising: a determination unit 22 for determining that a position detection sensor having no change in an output signal of N → OFF or OFF → ON is abnormal. 2. Locking means 10 for fixing door 2 to main body 1.
A lock position detecting sensor 20 for detecting a lock position of the lock unit 10; a lock position detecting sensor 20 for detecting a lock position of the lock unit 10;
0 when the lock means driving device 19 is actuated.
An automatic lock system comprising: a determination unit 22 for determining that the lock means driving device 19 is abnormal when a change in the output signal of N → OFF or OFF → ON is not detected by the position detection sensors 20 and 21. Door abnormality judgment device. 3. Locking means 10 for fixing door 2 to main body 1.
A lock position detecting sensor 20 for detecting a lock position of the lock unit 10; a lock position detecting sensor 20 for detecting a lock position of the lock unit 10;
A release position detection sensor 21 for detecting a release position of 0 is provided. If one of the lock position detection sensor 20 and the release position detection sensor 21 is abnormal, the output signal of the other normal position detection sensor is output. A control device for controlling the locking means driving device based on the time based on the control device. 4. The control device according to claim 3, wherein said automatic locking door has an abnormal condition. The controller 23 starts from a position of a normal position detection sensor.
A function of driving the locking means driving device 19 for a half of the time required for the device to make one reciprocation.