DE2712173A1 - ELECTROPNEUMATIC SAFETY CONTROL FOR AN AUTOMATIC DOOR OR DOOR OPERATING SYSTEM - Google Patents

Abstract

The electropneumatic safety control device having a pressure sensor (100) is designed for an automatic door or gate operating system whose drive can be controlled by the pressure sensor. Two pressure shaft switches (DW1, DW2) control two relays (d1, d2) of a controller (DWSR), which relays are connected in series with the system contactor (200), by means of the pressure sensor (100) during operation. In the event of defects in the pressure sensor or in the first relay (d1), the second relay (d2) takes over its function and automatically trips after a specific time so that the contactor (200), which is once again not live, allows the door to open; however in this case a defect indicator lamp (D11) illuminates. Admittedly the second relay (d2) can be pulled in again via a push button (30) and a defect contact arm (24), but the sequence of a tripping delay time has already started in a switching device (TZAB), after which the contactor (200) is finally switched off. The device can also be used in the case of a so-called latching contactor. <IMAGE>

Description

Electropneumatic safety control for an automatic

Door or gate operating system The invention relates to an electropneumatic Safety control for an automatic door or gate operating system that has one Drive for opening and closing the door or gate and a pressure transmitter which is operated when the door or gate is used.

It is known to open doors or gates, namely heavy gates such as e.g. in factories, garages or warehouses that open and close automatically to be provided with a safety control to prevent unintentional jamming prevent the persons using the entrance or an object (vehicle, etc.) target. Except for the well-known light barriers, where the interruption of the transverse controls the door operating mechanism via the light beam shining through the door opening in such a way that that this opens the door again immediately, are also electro-pneumatic Facilities known, for example, as they are used in public transport vehicles, but also on heavily used entrances such as those of shops. These Facilities are based on the principle that an air hose is either direct or indirectly, e.g. by means of a step or a mat placed over the entrance is compressed, whereby the resulting pressure surge creates a membrane contact switch also called pressure wave switch, actuated; in this a membrane is bent and makes an electrical contact, so that a signal is then emitted will. It is also known to attach protective shields to working machines when starting up the machine, lock the access to the processing zone and which are provided with a pressure switch so that a person who is still in this Zone carries out work, can pull out her arms and hands in time; the pressure switch causes the protective shield to come up again and the possibly already started machine.

It is essential with all of these facilities that they are flawless work, because a defect that is not recognized in time can under certain circumstances be more dangerous than the lack of a security system at all, because the regular ones Users of the same rely on them. It is therefore imperative to avoid interference immediately recognizable by such a control. A safety controller that does this Has advantage is already known. With her, the pressure surges of the pressure transducer forwarded to at least two independent pressure wave switches, which electrical impulses corresponding to the pressure surges to the control circuit of the door or gate opening system, which has a relay for the door or gate drive contains, which causes this drive in the dropped state, the door respectively to open the gate. The door or gate that has been opened once remain open, and the fault is indicated by a continuous light signal until it is fixed.

This achieves the greatest possible security. One and only The disadvantage, however, is that the door remains open all the time. Is it around a heavy, wide gate that leads to the outside, this can be in winter, but also have unpleasant consequences in the evening or at night; in winter this is mainly the inflow from cold air, during the evening or at night the building is also free from unauthorized persons becomes accessible.

However, it is not always possible to initiate repairs immediately to direct.

The invention therefore sets itself the task of a safety controller of the type mentioned at the beginning so that they are still limited during a Duration of normal operation with full display of the fault, such as if there was no defect. Only if after a given period of time a repair has not been carried out or is not yet possible, the door becomes permanent opened and can no longer be closed automatically.

At the same time, this control should be structured more simply and therefore both cheaper and less prone to failure. This safety controller of the type mentioned at the outset is characterized in that the pressure wave switches indirectly two relays are assigned, their relay contacts in series in a circuit are switched, which also contains the contactor for the door or gate drive, and that a fault bridging device is available, which if not switched off of the one relay and / or a defect in the pressure transmitter the other relay during a certain period of time can take over the function of the first relay, wherein this other relay turns on a device which, when the malfunction the contactor in the first relay and / or in the pressure transmitter after this time has elapsed finally switches off for the door or gate drive.

This control is independent of the type of pressure transducer.

This can either be the already mentioned walk-on mat, a Be threshold or the like, which the door or

the gate opens before the entrance is passed or

is driven through. But it can also be a so-called anti-trap protection device, which is attached to the vertical edge of the door and only responds when when closing the door on the object that is still in the passage respectively.

hits a person, whereupon the pressure wave released upon contact immediately reverses the closing movement of the door.

The invention is explained in more detail using exemplary embodiments; The figures show: FIG. 1 the circuit diagram of the safety controller, which is controlled by an im Bottom built-in pressure transducer can be actuated, FIG. 2 shows the circuit diagram in which the pressure transducer is on the door or gate (so-called anti-trap protection), Fig. 3 the control circuit of the safety control device in the scheme according to Fig. 1, Fig. 4 the control circuit for the scheme according to FIG. 2, FIG. 5 a first embodiment a pressure transducer in the form of a mat for the scheme according to FIG. 1, FIG. 6 a second Embodiment of this pressure transducer, and FIG. 7 shows a third embodiment of this Pressure transducer.

According to FIG. 1, the control we-is five interconnected parts on, namely a control unit DWSR, two pressure wave switching devices DWRBs with pressure wave switch DW1 and DW2, both switches being connected to a pressure transmitter 100 Relay TZAB connected to the control unit DWSR and a contactor 200, which is switched into the circuit of the door drive motor, not shown.

The control unit has a first relay dl with a single contact 20 on. Another relay contact 21 of a relay d2 is connected in series with this, which differs from relay contact 20 in that it has a much greater drop-out delay.

This relay d2 also has a further contact arm 22. A push button 30 is also provided. You can either just be depressed or also be pressed down and then rotated on it. The first shot ("Reset") and the second ("Alarm") of this push button 30 serve different purposes, as will be explained later. There are also two more labeled D9, D10 and Dil Control lights are available, which are preferably light-emitting diodes.

Each of the pressure wave devices DWRBs has except those already mentioned Pressure wave switches DW1 and DW2 each have a magnet 41, 42, one of which here is frustoconical has drawn locking pin 43. These pins 43 can be a vent branch 44 of the air lines 45, 46 from the pressure transducer 100 to the individual pressure wave switches Lead DWl and DW2, seal airtight; they are in the state shown away from the vent branches 44 so that the lines 45 and 46 are fully vented are. The two magnets 41 and 42 are connected to the normally closed contact pole 23 of the relay d2.

The relay TZAB is provided with a time delay device, that after a period of time t3, which is much greater than the delay period t2 of the relay d2, the relay TZAB drops out. When and for what reasons this process can occur will be explained.

As can be seen, the two contacts 20, 21 of the relays dl, d2 of the control unit, the relay TZAB and the contactor 200 of the door drive in series a voltage source P-N placed, this voltage source from the usual mains voltage can be stepped down.

The scheme according to FIG. 1 is drawn in the de-energized state.

It should be noted that the contactor 200 is in the circuit of the motor, not shown, is switched that the latter when the contactor is de-energized is, the door opens.

Furthermore, the two pressure wave switches DW1 and DW2 are in the idle state closed as shown; they are lifted off when a pressure surge arrives or open. The function is as follows: Pull when the control voltage is applied the relays dl and d2 on without delay. If the pressure transducer 100 is stepped on or driven on, the lines 45 and 46 are pressurized, and thus open the Contacts DW1 and DW2. The resulting signals are sent to the control unit DWSR forwarded. If at least one signal arrives in this device, it drops Relay dl off without delay; as a result, the contactor 200 is de-energized and the door is closed opened. At the same time, the two magnets 41, 42 close the ventilation branches 44 and thus the air lines 45, 46 tightly as long as the pressure transducer 100 is uninterrupted is entered or driven on.

An existing pressure on the two pressure wave switches DW1 and DW2 is displayed on control lamps D9 and D10.

If the pressure transducer 100 is relieved, the relay dl pulls with a delay period t4, for example a Second is on; with about the same Delay time, the two magnets 41, 42 fall off again and thus vent lines 45, 46.

If the relay dl has a mechanical defect, such as If the contacts stick, it can no longer fall off the next time you print. This would mean that the relay TZAB and thus the contactor 200 are constantly under Current would stand because the relay d2 has picked up. To avoid this, i. E. to de-energize the contactor 200 again and thus to open the door again, is immediately and without delay by an electronic monitoring circuit 3 (Fig. 3) the relay d2 made to drop out. The circuit to contactor 200 is now back interrupted; the door opens immediately. The control lamp Dll lights up at the same time ("Fault"). At the same time a timer circuit T2 (FIG. 3) begins Falling delay time to run, which can be 60 seconds, for example. During this time t2, the relay d2 takes over the function of dl; i.e., that Relay d2 picks up with a delay (approx. 1 sec.) And drops out without delay, accordingly the frequency of use of the pressure transducer. The mechanical defect on the relay is corrected dl does not by itself during this time t2, the relay d2 remains after this time has elapsed Time has finally dropped and at the same time a drop-out delay time begins in the TZAB relay t3 to run. This is much greater, for example it can be 48 hours.

The same drop-out delay time on relay d2 begins to run, if both signals of the pressure wave switch DW1 and DW2 arrive in the DWSR device.

However, if further signals come from both of them within time t2 Pressure wave switches that now have a time interval of less than t1 will have the saved Fault deleted automatically and the drop-out delay time in relay d2 is reset to zero.

However, if there is a defect in the compressed air system and it occurs continuously only one signal, the door opens immediately via the relay dl, but the fault is recognized, signaled on the control lamp Dll, and relay d2 drops out Expiry of the delay time t2. In this case, too, the TZAB relay begins Drop-out delay time t3 (e.g. 48 hours) to expire.

By pulsing the push button 30 and entering the Pressure transducer 100 within the fall-off delay time t2 can be attempted that Fix the malfunction. The drop-out delay time on relay d2 is repeated again and again reset to zero. If the disturbance remains, however, and nothing more undertaken, the relay d2 drops again after the time t2 has elapsed. The door will open again.

Now of course it is not possible to keep pressing the fault pushbutton 30 ("reset button") to press; the door operation should still continue will. To this.

The purpose of this is to turn the pushbutton after it has been depressed, which locks it into the "Alarm" position. As a result, the relay d2 pulls immediately back to. At the same time, however, the release delay time of the relay TZAB begins to expire, because its control circuit because of the opening of the fault contact arm 24 also interrupted in spite of the attraction of the relay d2 or its second contact is. If the fault cannot be rectified within time t3, the contactor will 200 finally de-energized after this time has elapsed.

The Dll control lamp lights up all this time.

After the malfunction has been rectified, the pushbutton 30 must return to its initial position be brought, whereupon the control lamp Dll goes out. the The control is ready for normal operation again.

It should be mentioned in particular that the control also responds i.e. causes the door or gate to open if there is a defect at the same time in the pneumatic circuit and there is a mechanical defect in the relay dl and even during malfunction t3 of 48 hours.

Fig. 2 shows the control in use as a so-called trapping protection. here is a two-chamber air tank 50 in the form of a rail on the vertical edge of the gate or the door attached. Containers of this type are in the Swiss U.S. Patent 557,949. The circuit is pretty similar to that of the Control according to Fig. 1, with the exception of individual timers. This control too is shown in the idle state. After applying the control voltage, pull between P-N the relays dl and d2 on immediately. The contactor 200 receives current as a result, and so does the door is moved in the closing direction. If the container 50 hits an obstacle, there is a pressure surge, which is transmitted by the two pressure wave switches to the relay dl is passed, causing it to drop, so that the movement of the door is instantaneous is reversed, i.e. the door opens immediately. As soon as the container 50 is relieved, the relay dl picks up again. If there is no malfunction, the door can be used again be moved in the closing direction.

Here, too, it is essential that both pressure surges are within a specified range Time tl, for example within one second, arrive in the device DWSR. if this is not the case, the relay dl drops immediately and the opening process the door is initiated. In contrast to the control according to FIG. 1, this is also the case Relay d2 after the time t. Simultaneously the fault lamp lights up Dll on.

Here, too, an attempt can be made to rectify the fault. by briefly squeezing the container 50. If that doesn't help, start the time t3 expires in the relay TZAB after the relay d2 has dropped out. At the end of this Time span the gate can no longer be closed. This part of the process is therefore the same as in the control according to FIG. 1.

The two electronic circuits of the DWSR safety device are shown in FIGS. 3 and 4. The impulses generated by the falling of the Pressure wave switches DW1 and DW2 are set to a so-called debounce level 1 conducted, which moderates the current surges somewhat, and from there via inverter C. an evaluation stage 2. This determines whether both signals have arrived within time tl are. At the same time, a comparison NAND element D also receives one or two pulses and switches off the relay dl. During the opening time of the pressure wave switch DW1 and DW2, the control lamps or LEDs D9 and D10 light up.

An important part of the circuit is a flip-flop element FF1. The two pressure waves from the pressure wave switches do not meet within the predetermined time tl with each other, this is stored in the flip-flop element.

The same occurs if a defect occurs on the relay dl, despite a pressure wave signal prevents its dropping, so that the contactor 200 because of of the still closed relay d2 is energized. In order to close it again without power make and in order to open the door again, as mentioned by the electrical Monitoring circuit or the electronic evaluation element 3 immediately and without delay the relay d2 made to drop out. This interrupts the circuit to contactor 200, so that the door opens immediately. By reversing of a flip-flop element FF2 begins to run down time t2 via timer T2. If within this Time span t2 again further pulses, but now within the time span tl, arrive, the flip-flop element FF2 is restored to its initial state. This also results in the timer T2 being reset to zero. Only, when the full time t2 has elapsed without the fault being rectified and without that the push button 30 has been pressed, the relay d2 is through a transistor T3 dropped. So it takes over the function of the relay dl. The circuit from contactor 200 is interrupted, and this takes care of reversing the drive, so that the gate is opened.

The difference between the circuit in FIG. 4 and that of FIG. 3 is only based on the fact that the timer T2 is missing.

The relay d2 therefore drops out after the time tl, so that the Contactor 200 is immediately de-energized. This is the main condition of anti-trap protection Fulfills. Instead of a time-dependent memory cell, there is a memory cell 4, which stores the state of the flip-flop element FF1. The latter can only Overturn back to its normal state when again two pressure wave signals within the time tl arrive. When you press button 30, the information is in the Memory cell 4 erased; however, the flip-flop element FF1 still stores a fault, the relay d2 drops out again immediately.

Here, too, by pressing and turning the pushbutton 30, the Relay d2 to be tightened again and thus normal operation can be established; in the However, in this case too, relay TZAB begins to run down a time t3, after which the door is finally opened and remains open until the fault has been rectified.

Figures 5 and 6 now show how the two air lines 45, 46 can be arranged together in a pressure transducer 100, here a pedal mat. The underside of the same is provided with regular projections 101, the so are designed that in between a network of perpendicular to each other Channels 102, 103 forms in which the two lines 45, 46 are independent can be relocated from each other that when crossing or driving over the Mat both more or less at the same time, at least compressed within the time tl to deliver their pressure surges. It is even more practical to use the underside and top with round projections, so-called knobs 104, to be provided. The spaces in between 105 are advantageously chosen to be so large that the mat is produced in large pieces and can be cut to size on the spot; the relative wide spaces 105 then allow the cut to size to be easily framed Piece by means of frame rails (Fig. 7), without initially the projections on the Thickness of the mat in the gaps 105 must be milled off in order to surround this to enable at all.

Claims (11)

Claims Electropneumatic safety control for a automatic door or gate operating system that has a drive for opening and closing the door or the gate as well as a pressure transducer, which when the door is in use respectively. of the gate is operated and the resulting pressure surges at the same time forwards to at least two independent pressure wave switches, which electrical impulses corresponding to the pressure surges to the control circuit of the door or deliver a gate opening system that contains a contactor for the door or gate drive, which controls this drive in the dropped state so that it opens the door or the door opens, characterized in that the pressure wave switches (DW1, DW2) indirectly two relays (dl, d2) are assigned whose relay contacts (20, 21) are connected in series in a circuit that also includes the contactor (200) for the Includes door or gate drive, and that a fault bridging device (30) is present, which when not switching off one relay (dl) and / or one Defect in the pressure transmitter (50, 100) the other relay for a certain period of time (t2) can take over the function of the first relay (dl), this other relay (d2) a device (TZAB) switches on, which in the event of a persistent defect in the first relay (dl) and / or in the pressure transmitter (50, 100) after this period of time (t3) the contactor (200) for the door or gate drive finally switches off. 2. Safety controller according to claim 1, characterized by a electronic evaluation element (2) in the safety device (DWSR), which Faults in the pneumatic part (45, 46, DW1, DW2) and / or electrical interruptions in the supply lines from the pressure wave switches (DW1, DW2) to the control unit (DWSR) recognizes, relocates a connected flip-flop element (FF1) via a time circuit (T1) and a time stage (T2) triggers, wherein after the mentioned time period (t2) this restoring signal remains stored in this time stage (T2) and at the same time the second relay (d2) drops out. 3. Safety controller according to claim 1, characterized by a Another electronic evaluation element (3) in the safety device (DWSR), which is mechanical Detects and evaluates faults at the first relay (dl) in order to control the second relay (d2) to drop off immediately. 4. Safety controller according to claim 2, with a walkable or drivable Pressure transmitter (100), characterized in that the flip-flop element (FF1) has the time stage (T2) is connected downstream, which during the said period (tal) in operation is and within the 2 time period (t2) the flip-flop = element (FF1) - back in his Original state overturns if the fault in the pneumatic part within this Time has been remedied, during which time the second relay (d2) automatically takes over the function of the first (dl) and only after this time has elapsed finally falls away. 5. Safety controller according to claim 2, characterized in that the timer (T2) by actuating the fault bridging device (30) again on his Zero state is traceable, so that the time span (t2) begins to run again. 6. Safety controller according to claim 2, with only one of objects in the closing area of the door or the gate actuatable pressure transducer (50), marked, by a memory element (4) connected to the flip-flop element (FF1), which information relating to a fault overturning the flip-flop element for as long stores until this information by operating the fault bridging device (30) is deleted again. 7. Safety controller according to claim 1, characterized by a Monitoring device (3) for controlling the second relay (d2) when it occurs mechanical faults on the first relay (dl). 8. Safety control according to claim 4, characterized in that that the pressure transducer is a mat with protrusions (101, 104) on the underside has, between which two compressible, independent air lines (45, 46) are attached, each of which to one of the pressure wave switches (DW1, DW2) leads. 9. Safety controller according to claim 8, characterized in that the projections (104) are circular knobs, between which spaces (105) to accommodate the lines (45, 46) are available. 10. Safety controller according to claim 4, characterized in that that the pressure transducer is a mat that is attached to the top and bottom bottom has circular knobs, the rows of knobs having the same pitch on both sides have to divide the mat into smaller pieces and edging the to enable the latter with cover strips without reworking. 11. Safety control according to claims 1 and 8, characterized in that that the air lines (45, 46) have ventilation branches (44) through which magnets (41, 42) actuatable closures (43) are lockable.