JPH0748954Y2 - Safety devices in electric shutters for buildings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a safety device in an electric shutter for a building such as an electric overhead door installed in an opening of a building.

[Problems to be Solved by Prior Art and Invention] Generally, in an electric shutter for a building of this type, a door body is wound by an opening / closing machine of an operating wire attached to a lower end portion of the door body such as an overhead door. There are some that are designed to open and close automatically. In such an electric machine, even if an obstacle hits the door when the door is closed, the descent is hindered, but if the operator does not notice this and continues to drive the switch, the obstacle may be crushed. There is Therefore, there is one in which an emergency stop means for detecting an abnormality such as obstacle detection and for making an emergency stop based on the abnormality is provided in the drive control circuit of the switch.

By the way, this emergency stop means has a time loss until an obstacle is abutted against it and the obstacle is actually detected, and the switch is emergency stopped based on this obstacle detection. Even if you try, the inertial force of the descending shutter curtain does not stop immediately because the opening and closing mechanism acts on the opening and closing mechanism, and there is also a time loss in the control of the brake device, so that the door The body is
An emergency stop will be made at a position slightly lower than the position where the obstacle starts to contact.

Then, when such an emergency stop means is used for the one in which the shutter curtain is directly wound around the winding drum, the emergency occurs at a position slightly lower than the position at which the shutter curtain starts contacting the obstacle. Even if you stop it,
The shutter curtain itself, which is about to descend by its own weight, is absorbed by the corrugation within the gap between the guide rail and the guide rail, so that after removing obstacles and other abnormalities, the normal state is restored immediately. There is no problem.

However, if this is used as it is for opening and closing the door body by winding the operating wire, the operating wire will be unreeled when the emergency stop occurs, but the operating wire itself, such as a shutter agar It is not possible to expect such a self-weight lowering function, rather than that, there is an action to try to return to a straight state (natural state), and as a result, there is a fear that the operating wire will loosen and come off from the wire drum by the amount of extra feeding. is there. And without noticing the disconnection of the operating wire,
If the obstacle is removed and the opening / closing operation is performed again, the winding of the operating wire is disturbed and the state becomes almost unrecoverable. .

In order to deal with this, it is proposed to provide a loosening absorbing means for the working wire, but the loosening amount of the working wire depends on the specifications such as the size of the door body, the emergency stop position, the opening / closing speed, the braking force of the brake device, etc. Therefore, it is not constant, and it is practically impossible to use one type of loosening absorbing means for all these specifications, and there is a problem that a dedicated loosening absorbing means corresponding to each specification must be provided.

[Means for Solving the Problems] The present invention was devised with the object of providing a safety device in an electric shutter for a building that can eliminate these drawbacks in view of the above-mentioned circumstances.
In an electric shutter for a building in which an opening / closing operation of a door body is performed by winding an operating wire based on forward / reverse driving of the opening / closing machine, the drive control circuit of the opening / closing machine prevents the door body from contacting an obstacle. In providing an emergency stop means for performing an emergency stop based on the detection of an abnormality, the emergency stop means,
The self-holding circuit for holding the abnormality detection state is provided.

Further, according to the present invention, when there is an abnormality in the lowered position of the door body, the present invention detects the abnormality and stops the opening / closing device, and can also hold the stopped state.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes an overhead door that is installed in an opening of a building, and a door body 2 that constitutes the overhead door 1 is composed of a plurality of panels 3 that are vertically bound by a hinge or the like so as to be flush with each other. Is formed. Rollers 4a rotatably supported by a roller shaft 4 are provided at both left and right ends of the panel 3, and these rollers 4a roll in the guide rails 5. An operating wire 6 is attached to the lower end of the door body 2, and the operating wire 6 is wound around a wire drum 7 provided above. A switch 8 is linked to the wire drum 7,
The operating wire 6 is wound up or unwound around the wire drum 7 by forward / reverse driving of the opening / closing device 8 by means of a lifting control to be described later, whereby the automatic opening / closing operation of the door body 2 is performed. It has become.

Reference numeral 9 denotes a safety switch which is arranged slightly above the position of the uppermost roller 4a when the door body 2 is fully closed. In this embodiment, the safety switch 9 is provided at an appropriate interval excluding the pitch between the rollers 4a. Two are installed. The switch lever 9a of the safety switch 9 projects toward the guide rail 5 side,
When the roller 5a rolls in the guide rail 5 as the door body 2 moves up and down, the roller shaft 4 comes into contact with the switch lever 9a. The detection switch 9 is normally closed, but when the roller shaft 4 contacts the switch lever 9a, the switch contact is switched and the switch is opened, and when the roller shaft 4 is separated, it is closed again. There is.

FIG. 3 shows a drive control circuit diagram of an electric overhead door in which the present invention is implemented. Here, M is a motor (switch 8), MB is a brake, E is a power supply (three-phase AC in this example). 20
0V), KS is the main switch, F is the fuse, PBU, PBD and PBS are the push button switches for raising, lowering and stopping respectively, EMS is the switch for emergency stop, LSU and LSD are the upper and lower limit switches respectively, and RYU and RYD are respectively a relay switch for raising and lowering and a switch contact for the relay switch, and these are all incorporated in a conventional wiring circuit. Further, in the present embodiment, a timer line independent of these circuits is provided, and the two safety switches 9 (S in the circuit diagram are provided in this timer line.
W ₁ , SW ₂ ) are incorporated in a parallel relationship.

Then, when the motor M is driven, the roller shaft 4 separates from the switch lever 9a as described above, and the safety switch S
While W ₁ and SW ₂ are closed, current is applied to the timer line and the timer switches TM ₁ and TM ₂ are operating the timer, but the roller shaft 4 acts on the switch lever 9a and the safety switch SW ₁ , SW ₂ is opened, the line is disconnected and the timer times TM ₁ and TM ₂ timer times T ₁ and T ₂ are reset. The timer times T ₁ and T ₂ of the timer switches TM ₁ and TM ₂ are set to the roller shaft 4 when the door body 2 moves up and down.
There was reset timer Sui Tutsi TM _1, TM ₂ is opened the safety switch SW _1, SW ₂ and brought into contact Suitsuchireba 9a,
The next roller shaft 4 contacts the switch lever 9a and is set to a time (T ₁ , T ₂ > t) slightly longer than the time t required to reset the timer switches TM ₁ and TM ₂ . These timer switches TM ₁ , TM ₂ switch contacts TM ₁ , TM ₂
Is closed in parallel with a safety circuit formed by wiring that is directly connected to the power supply side.In this safety circuit, a safety relay switch R ₂ is connected in series with the above-mentioned switch contacts TM ₁ and TM _2. It is connected. On the other hand, this safety relay switch
One switch contacts R _2, R ₂ of R ₂ is connected to the circuit between said the emergency stop switch EMS and stop switch PBS,
The other is timer contacts TM ₁ , TM ₂ to form a self-holding circuit.
It is connected in parallel with.

In the embodiment of the present invention configured as described above, the drive control of the opening / closing device 8 is performed by the push operation of the push button switches PBU, PBD, and PBS, and the operation wire 6 is driven by the forward / reverse driving of the opening / closing device 8. The door body 2 is opened and closed by winding and rewinding. In normal times, however, the roller shaft 4 is moved by the vertical movement of the door body 2 so that the safety switch 9 does not have the timer time T ₁ or T _2. The safety relay switch R ₂ does not operate because it contacts the lever 9a and resets it.

However, if the door body 2 stops or the descent speed slows down due to the presence of obstacles, etc., the reset of the safety switches SW ₁ and SW ₂ by the roller shaft 4 is reset by the timer time T ₁ , T ₂ will not be made,
As a result, the timer switches TM ₁ and TM ₂ are activated to switch the safety relay switch R ₂ , and thereby the switch contact R ₂ is opened to disconnect the drive control circuit of the motor M.
The switch 8 will stop. Further, since the safety circuit is self-held, even if the pushbutton switches PBU and PBD are pushed, the safety relay switch R ₂ is held in the above-mentioned operating state and the switch 8 is no longer driven.

As described above, in the case where the present invention is implemented, when the raising / lowering speed of the door body 2 becomes slow or stops due to some abnormality, the delay is detected and the switch 8 is driven. Safety can be secured by stopping the emergency. Therefore, even when the opening / closing operation is performed by winding the operation wire 6, a reliable emergency stop can be performed. Moreover, since the safety relay switch R ₂ is held by itself in the switchgear 8 that has thus made an emergency stop, the pushbutton switch PB
Even if U and PBD are pushed, they are not driven. At this point, it is sufficient to inspect whether the operating wire 6 is detached from the wire drum 7 and then turn on the main switch KS again. As a result, for example, it is possible to surely prevent the trouble that the actuating wire 6 comes off the wire drum 7 without noticing it, and adopts the winding method using the actuating wire, but is extremely safe. Can be high.

Moreover, the members required for the detection are only the safety switch 9 and the actuating member for switching the safety switch 9, and in the embodiment, the actuating member uses the roller shaft 4 as it is, which is not only inexpensive. The advantage is that it can be easily attached to an existing overhead door.
Further, in this embodiment, since the two safety switches 9 are installed, if the roller body 4 stops just when the roller shaft 4 is in contact with one of the safety switch levers 9a, the safety of the door body 2 is stopped. Although the timer circuit of the switch 9 remains off, the timer switch TM connected to the other safety switch 9 operates to stop the switch, so that the safety can be further improved.

In the present invention, the timer switch is used to detect the abnormality, but the invention is not limited to this. The emergency stop of the door body that is opened and closed by winding the operating wire causes the door body to contact the obstacle. As long as it is configured to perform detection based on the obstacle detection, for example, even if it is configured as shown in FIG. 4, from the stage when the door body starts contacting the obstacle until the descent is actually stopped. There is a time loss in this, and this can be similarly implemented.

[Effects] In summary, since the present invention is configured as described above, when abnormalities such as obstacle detection are detected during the opening / closing operation of the door body, the opening / closing operation of the door body is urgently stopped to ensure safety. However, even if the obstacle is removed after an emergency stop in this case, the abnormality detection state is maintained as it is. Therefore, during the time loss from the time when the door body starts contacting the obstacle to the time when the emergency stop occurs, the actuating wire is unwound excessively and loosens, and the actuating wire is opened and closed again while it remains disengaged from the wire drum. Therefore, it is possible to prevent troubles such as irregular winding of the actuating wire and dropping of the door body, thereby ensuring high safety.

[Brief description of drawings]

FIG. 1 shows an embodiment of a safety device for an electric shutter for a building according to the present invention. FIG. 1 is a side view of an overhead door, FIG. 2 is a plan view of essential parts, and FIG. FIG. 4 is a drive control circuit diagram of the switch, and FIG. 4 is a drive control circuit diagram showing another example. In the figure, 1 is an overhead door, 6 is an operating wire, 8 is a switch, 9 is a safety switch, TM ₁ and TM ₂ are timer switches and their switch contacts, and R ₂ is a safety relay switch and its switch contacts.

Claims (1)

[Scope of utility model registration request] 1. An electric shutter for a building in which an opening / closing operation of a door body is performed by winding an operating wire based on forward / reverse drive of the opening / closing machine, wherein the door body is an obstacle in a drive control circuit of the opening / closing machine. In providing the emergency stop means for performing an emergency stop based on the detection of an abnormality caused by the contact with the vehicle, the emergency stop means is provided with a self-holding circuit for holding the abnormality detection state. Safety device in shutters.