Swing door

Abstract

Swing door (1) with an electric drive (5) and a control unit (6) controlling the electric drive (5), wherein a door leaf (3) can be brought into a closed position and an open position with the electric drive (5), characterized in that the swing door (1) has an oscillating circuit (8) and an evaluation unit connected to the oscillating circuit (8), to which output signals from the oscillating circuit (8) are fed, in that the door leaf (3) consists at least partially of an electrically conductive material and forms a capacitor surface which is connected to the oscillating circuit (8), so that when an object or a person (P) approaches the door leaf (3), a resonance frequency of the oscillating circuit (8) is changed, and in that a control signal is generated in the evaluation unit depending on the changed resonance frequency.

Description

The invention relates to a rotating sash door.Such a rotating sash door can be designed in particular as a house door of a building.In a known manner, opening and closing processes of such a rotating sash door can be carried out automatically. For this purpose, the rotating sash door is assigned an electric drive and a control unit which controls the electric drive. With the electric drive, the door leaf of the rotating leaf door can be moved between a closed position and an open position.In an automated operation of such a rotating sash door, there is a general problem in that a person who enters the region of the rotating sash door can be gripped by the door leaf during the closing or opening movement carried out with the electric drive, which not only represents an undesirable impairment for the respective person but can also lead to injuries to the person, in particular when fingers of a person engage in the region of shear edges or pinch edges between the door leaf and frame of the rotating sash door.In order to avoid such hazardous situations, it is known to monitor the front of such a rotating sash door with sensors. An example of such a sensor is an optical sensor, such as a laser scanner, for example, with which a spatial area in front of the rotating sash door is monitored. The area behind the door can also be monitored with such an optical sensor.The disadvantage here is, on the one hand, that such an optical sensor has to be mounted outside the rotating leaf door, for example on a wall adjoining the rotating leaf door or on the door leaf, as a result of which a considerable additional installation space is required. It is furthermore disadvantageous that such optical sensors are very expensive.The invention is based on the object of providing effective monitoring for a rotating sash door with low cost and construction complexity.To achieve this object, the features of claim 1 are provided. Advantageous embodiments and practical developments of the invention are described in the dependent claims.The invention relates to a butterfly door having an electric drive and a control unit controlling the electric drive. With the electric drive, a door leaf can be introduced into a closed position and an open position. The rotating sash door has an oscillating circuit and an evaluation unit connected to the oscillating circuit, to which output signals of the oscillating circuit are fed. The door leaf is at least partially made of an electrically conductive material and forms a capacitor surface which is connected to the resonant circuit. When an object or a person approaches the door leaf, a resonant frequency of the resonant circuit is changed. A control signal is generated in the evaluation unit depending on the changed resonant frequency.According to the invention, a protection function is provided for a rotating sash door in such a way that an approach of a person or an object to the door leaf of the rotating sash door is detected, so that a control signal for protecting the person or the object is generated. It is essential here that an approach of a person or an object can be detected in a contactless manner with sensor means, i.e. before the person or the object comes into contact with the door leaf. This early person or object recognition prevents contacts of the person or the object with the door leaf, whereby in particular hazardous situations for persons can be avoided.Furthermore, light contact contacts can also be detected with the sensor means, so that contacts of a person or of an object with the door leaf are also reliably detected under the action of small forces.An essential aspect of the invention consists in that the door leaf of the rotating leaf door itself can be used as sensor means for detecting persons or objects, so that no complicated sensor means are necessary outside the rotating leaf door.In this case, use is made of the fact that the door leaf of the rotating leaf door is made at least partially of an electrically conductive material. In particular, the door leaf can consist at least partially of a metallic material, such as aluminum.Due to this electrical conductivity, the door leaf is used as a capacitor surface which is connected directly or indirectly to an oscillating circuit. A direct connection is a galvanic connection. An indirect connection is a capacitive coupling. The resonant circuit consists in a known manner of a coil-capacitor arrangement and has a specific resonant frequency. If a person or an object approaches the door leaf, this person or object interacts with the capacitor surface of the door leaf, as a result of which a capacitance is generated, by means of which the resonant frequency of the resonant circuit is detuned. This results in a change in the output signal of the resonant circuit, which is evaluated in the evaluation unit assigned to the resonant circuit. By means of this evaluation in the evaluation unit, a person or an object is detected in good time when approaching the door leaf, i.e. before contact with the door leaf occurs, and a control signal is thereby generated, by means of which hazardous situations are avoided.The resonant circuit and the evaluation unit, which can be formed by a microprocessor or the like, only require a small installation space and can thus be integrated in the door leaf itself.Thus, all sensor means and evaluation means which are required for detecting approximations of persons or objects are integrated in the door leaf itself.It is also particularly advantageous for the electric drive and the control unit to be integrated in the door leaf, so that no drive components are present on the outside of the rotating leaf door either.The evaluation unit is particularly expediently a component of the control unit, resulting in a particularly compact structure of the electronic components.According to an advantageous embodiment, a movement of the door leaf is stopped by the control signal.By stopping the movement, hazardous situations are avoided. In particular, risks of injury to persons are avoided, since the movement of the door leaf is stopped before the person comes into contact with the door leaf, i.e. before the person collides with the door leaf. In particular, it is thereby possible to prevent a finger of a person from being clamped between the door leaf and a frame of the rotating leaf door.Alternatively or additionally, the control signal generates an optical or acoustic warning message.The warning message is used to warn a person approaching the rotating leaf door before it comes into contact with the leaf, i.e. before the person collides with the leaf. As a result, the person can yield to a hazardous situation in good time.According to an advantageous embodiment of the invention, in a learning mode, output signals of the resonant circuit are learned as reference values in the evaluation unit as a function of the position of the door leaf if no object or no person is located in the influence range of the capacitor surface formed by the door leaf.Expediently, in the learning mode, the entire travel path of the door leaf between the closed position and the open position is learned, namely in both directions of travel of the door leaf.In order to be able to carry out the learning process, the rotating leaf door has an angle sensor, by means of which the position of the door leaf is determined.In the learning operation, the output signals of the non-influenced resonant circuit are detected.A position-dependent determination of the output signals of the resonant circuit is expedient here because these generally have a characteristic position dependence. This is based in particular on the fact that the door leaf is mounted in a frame which, like the door leaf, is made of an electrically conductive material. The frame thus influences the capacitor surface formed by the door leaf and thus also the resonant circuit. The degree of influence decreases the further the door leaf approaches the open position.The control signal is advantageously generated by comparing currently ascertained output signals with the reference values.The comparison is made depending on the position, i.e. a current output signal for a specific position of the door leaf is compared with the reference value for the same position of the door leaf.In the event of a detected deviation of the current output signal from the reference value, the control signal is generated. The output signal is compared with the reference signal with respect to gradient, offset and typical patterns, which characteristically represent an approach / contact of a person with the door leaf, the so-called reference value comparison.The control signal is particularly advantageously generated if the current output signals do not correspond to the reference values within predefined tolerance limits, both during an opening and during a closing movement of the door leaf.The tolerance limits are advantageously adapted to the fluctuations in the measured value of the output signal that occur. The determination of the tolerance limit can be carried out on the basis of measurements with the resonant circuit, in particular under varying ambient conditions such as temperature controller or air humidity. An upper tolerance limit above the output signals and a lower tolerance limit below the output signals are expediently determined. These tolerance limits are stored in the evaluation unit with the reference values determined in the learning operation. According to an advantageous development, the tolerance limits are adapted during each travel of the door leaf.By comparing the reference values within the tolerance limits, erroneous detections and thus erroneously generated control signals are largely avoided.According to an advantageous development, the capacitor surface and / or its coupling to the resonant circuit is designed such that output signals of the resonant circuit are designed differently when a person or an object approaches the inner side or outer side of the door leaf.This can be realized, for example, by an unsymmetrical coupling of the inner and outer sides of the door leaf to the resonant circuit. In general, it is also possible to configure the conductive properties of the door leaf differently on its inner and outer sides, which can be achieved by using different door materials or screens. In principle, it is also possible to couple the inside and outside of the door leaf to different resonant circuits for which separate output signals are obtained.The advantage of this embodiment is that, due to the asymmetry of the output signals in the evaluation unit, depending on whether a person or an object approaches the door leaf from the inside or outside, the control signal can be configured differently, whereby an extended functionality is obtained.If, for example, a person approaches the outer side of the door leaf, the movement thereof must be stopped immediately, in particular if the door leaf is moving in the direction of the closed position, since there is then the risk that the person squeezes a finger between the door leaf and the frame of the rotating leaf door.If, on the other hand, a person approaches the outside of the door leaf during the opening, this risk is not present and an opening movement of the door leaf does not have to be stopped.According to a further advantageous development, it is differentiated in the evaluation unit on the basis of output signals of the resonant circuit whether a person or an object approaches the door leaf or is in contact with the door leaf.This can be determined by the intensity of the change in the output signal, since the output signal changes particularly strongly when a person or an object makes contact with the door leaf.The control signal is advantageously dependent on whether a person or an object approaches the door leaf or is in contact with the door leaf.In particular, when there is contact with the door leaf, a control signal is generated, with which the movement of the door leaf is stopped immediately.In general, it is possible that the sensitivity of the evaluation in the evaluation unit can be adjusted by an engineer.The rotary wing door according to the invention is advantageously arranged in a building or in its facade. In particular, the rotating sash door can be a house door.The invention is explained below with reference to the drawings. The following are shown: FIG. 1 : Schematic illustration of the rotating sash door according to the invention. FIG. 2 : Illustration of the rotating leaf door when a person approaches the door leaf of the rotating leaf door. FIG. 3 : output signals of the resonant circuit of the rotary wing door with associated tolerance limits without object intervention. FIG. 4 : output signals of the resonant circuit of the rotary wing door with associated tolerance limits with object intervention.FIG. 1 shows a highly schematic view of an exemplary embodiment of the rotary wing door 1 according to the invention.The rotating leaf door 1 has a door leaf 3 pivotably mounted in a frame 2. For this purpose, the door leaf 3 is rotatably mounted on one side of the frame 2 by means of straps 4 or the like.The door leaf 3 can be moved by means of an electric drive 5, which is controlled by a control unit 6, between a closed position, in which the door leaf 3 lies in the frame 2, and an open position.The electric drive 5 and the control unit 6 are integrated in the door leaf 3. The control unit 6 may be constituted by a microprocessor or the like.An angle sensor 7 is assigned to the electric drive 5, with which its current angular position is determined. The angle sensor 7 is also integrated in the door leaf 3. The signals of the angle sensor 7 are read into the control unit 6. In the control unit 6, the current position of the door leaf 3 is determined on the basis of the signals of the angle sensor 7.The door leaf 3 and optionally also the frame 2 of the rotating leaf door 1 consist at least partially of an electrically conductive material, in particular a metallic material such as e.g. aluminum.The electrical conductivity of the door leaf 3 is utilized according to the invention to use the door leaf 3 as a sensor means for carrying out object detections.For this purpose, the door leaf 3 is electrically conductively connected to an oscillating circuit 8 integrated in the door leaf 3.The resonant circuit 8 has, in a known manner, a coil-capacitor arrangement by which a resonant frequency of the resonant circuit 8 is defined. In the resonant circuit 8, there are also provided regulating means by means of which the resonant circuit 8 is regulated to the resonant frequency.The door leaf 3 is connected to the resonant circuit 8 by means of an electrical line 9. In the present case, the electrical line 9 is formed by a wire which is arranged in a circumferential manner on the edge of the door leaf 3 and the free ends of which are led onto the resonant circuit 8.Output signals generated in the resonant circuit 8 are fed to an evaluation unit, which in the present case is formed by a control unit 6 or is integrated therein. In general, the evaluation unit can also be formed by a separate computer unit.In the case of the rotary wing door 1 according to the invention, a monitoring function is realized, which is explained with reference to FIG. 2.FIG. 2 shows the door leaf 3 with the frame 2, wherein the movement of the door leaf 3 is illustrated with a double arrow.The door leaf 3 forms a capacitor surface. If, as shown in FIG. 2, a person P or an object which itself has conductive properties approaches the door leaf 3, an additional capacitance is thereby generated which changes the resonant frequency of the resonant circuit 8. The output signal thus changed is evaluated in the evaluation unit as person or object recognition. As a result, the evaluation unit generates a corresponding control signal.In this case, a movement of the door leaf 3 can be stopped by the control signal.Alternatively or additionally, the control signal generates an optical or acoustic warning message.In any case, the control signal generates a safety function with which a person P is protected against possible hazardous situations, such as a collision with the door leaf 3 or a squeezing-in of fingers between the door leaf 3 and frame 2.Particularly advantageously, in a learning mode, output signals of the resonant circuit 8 are learned as reference values in the evaluation unit as a function of the position of the door leaf 3 if no object or no person P is located in the influence range of the capacitor surface formed by the door leaf 3.This is illustrated in FIG. 3. There, the defined integrated output signal A of the resonant circuit 8 determined in the learning mode is plotted as a function of the position X of the door leaf 3. The profile of the integrated output signal A is only shown qualitatively and schematically. The position-dependent values of the integrated output signals A form reference values.In FIG. 3, X 1 denotes the closed position and X 2 denotes the open position of the door leaf 3. The values for the opening and closing are learned separately from one another. The integrated output signal A of the resonant circuit 8 is greatest in the closed position, since the interaction of the capacitor surface formed by the door leaf 3 with the frame 2 is maximal there. From the closed position to the open position, this interaction becomes continuously smaller, so that the integrated output signal A becomes continuously smaller toward the open position of the door leaf 3.In the evaluation unit, an upper tolerance limit T O and a lower tolerance limit T u are defined for the integrated output signal A determined in the learning operation, which take account of empirically determined measurement value fluctuations, for example also due to changing ambient conditions.In the working operation of the rotating leaf door 1 following the learning operation, the current output signal A' of the resonant circuit 8 is compared with the reference values, in particular the tolerance limits T O, T u depending on the position of the leaf 3. This is shown by way of example in FIG. 4.As FIG. 4 shows, in the position X o of the door leaf 3, a critical approach of the person P to the door leaf 3 (as shown in FIG. 2) takes place, so that the current output signal A' is thereby outside the tolerance limits T O, T u. As a result, the control unit 6 generates the control signal.According to an advantageous development, the capacitor surface and / or its coupling to the resonant circuit 8 is designed such that output signals of the resonant circuit 8 are designed differently when a person P or an object approaches the inside or outside of the door leaf 3.The control signal can then be embodied differently when a person P or an object approaches the inside or outside of the door leaf 3.According to a further development, it is differentiated in the evaluation unit on the basis of output signals of the resonant circuit 8 whether a person P or an object approaches the door leaf 3 or is in contact with the door leaf 3.This distinction can be made on the basis of the amplitude of the change in the actual output signal A', since a greater change in the output signal is obtained when a person P or an object makes contact with the capacitor surface than when a mere approach is made.In this case as well, the control signal may be dependent on whether a person P or an object approaches the door leaf 3 or is in contact with the door leaf 3.List of reference characters1 Butterfly door 2 frame 3 door leaf 4 belt 5 electric drive 6 control unit 7 angle sensor 8 resonant circuit 9 line A integrated output signal A', current output signal P person

Claims

A rotating leaf door (1) having an electric drive (5) and a control unit (6) controlling the electric drive (5), wherein a door leaf (3) can be introduced into a closed position and an open position by means of the electric drive (5), characterized in that the rotating leaf door (1) has an oscillating circuit (8) and an evaluation unit connected to the oscillating circuit (8), which evaluation unit has output signals of the oscillating circuit (8) fed to it, that the door leaf (3) at least partially consists of an electrically conductive material and forms a capacitor surface which is connected to the oscillating circuit (8), such that when an object or a person (P) approaches the door leaf (3), a resonant frequency of the oscillating circuit (8) is changed, and that a control signal is generated in the evaluation unit as a function of the changed resonant frequency.The rotating leaf door (1) according to claim 1, characterized in that a movement of the door leaf (3) is stopped by the control signal.The rotating sash door (1) according to one of claims 1 or 2, characterized in that an optical or acoustic warning message is generated by the control signal.The rotating leaf door (1) according to any one of claims 1 to 3, characterized in that in a learning operation, output signals of the resonant circuit (8) are learned in the evaluation unit as reference values depending on the position of the leaf (3) if no object or no person (P) is located in the influence region of the capacitor surface formed by the leaf (3).The rotating leaf door (1) according to claim 4, characterized in that it comprises an angle sensor (7) by means of which the position of the leaf (3) is determined.The rotating leaf door (1) according to one of claims 4 or 5, characterized in that in the learning operation the entire travel path of the door leaf (3) between the closed position and the open position is learned.The rotating sash door (1) according to one of claims 4 to 6, characterized in that the control signal is generated by a comparison of currently determined output signals with the reference values.The rotating sash door (1) according to claim 7, characterized in that the control signal is generated if the current output signals (A') do not match the reference values within predefined tolerance limits.The rotating leaf door (1) according to any one of claims 1 to 8, characterized in that the capacitor surface and / or its coupling to the resonant circuit (8) are configured such that output signals of the resonant circuit (8) are configured differently when a person (P) or an object approaches the inner side or outer side of the door leaf (3).The rotating leaf door (1) according to claim 9, characterized in that the control signal is configured differently when a person (P) or an object approaches the inside or outside of the door leaf (3).The rotating leaf door (1) according to any one of claims 1 to 10, characterized in that it is differentiated in the evaluation unit based on output signals of the resonant circuit (8) whether a person (P) or an object approaches the leaf (3) or is in contact with the leaf (3).The rotating sash door (1) according to claim 11, characterized in that the control signal is dependent on whether a person (P) or an object approaches the door sash (3) or is in contact with the door sash (3).The rotating sash door (1) according to one of claims 1 to 12, characterized in that the evaluation unit is a component of the control unit (6).The rotating leaf door (1) according to any one of claims 1 to 13, characterized in that the control unit (6), the evaluation unit, the resonant circuit (8) and the electric drive (5) are integrated in the door leaf (3).The rotating leaf door (1) according to any one of claims 1 to 14, characterized in that the door leaf (3) is made at least partially of a metallic material.The rotating sash door (1) according to one of claims 1 to 15, characterized in that it is a house door.

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