EP3303868A1

EP3303868A1 - Position detector

Info

Publication number: EP3303868A1
Application number: EP16728593.1A
Authority: EP
Inventors: Andreas Mair
Original assignee: Knorr Bremse GmbH
Current assignee: Knorr Bremse GmbH
Priority date: 2015-05-27
Filing date: 2016-05-20
Publication date: 2018-04-11
Also published as: MA50130A; WO2016187631A1; US20180156635A1; AT517317A1; AT517317B1; CN107646080A

Abstract

The invention relates to a device for detecting the current position of an object or component (7), which can be moved back and forth between two positions by means of an electromagnetic field, in particular the movable counter-disc of a toothed disc (5), of a magnetically or electromagnetically operable brake (1) or clutch, in particular in the door drive of a vehicle such as a railway car. In order to protect the contact projections (12) of the switch (11) used, it is proposed that a separate detector part (10) is provided for detecting the position of the movable component (7), which can move in the direction of the movement thereof with respect to the movable component (7), that the detector part (10), such as the movable component (7), is under the action of the electromagnetic field which is moving the component (7), and that the detector part (10) contacts at least one contact projection (12) of the switch (11) in one of the two positions by means of a switch finger arm (12') and has a distance therefrom in the other position.

Description

position detector

The invention relates to a device for detecting the instantaneous position of an object which can be moved back and forth between two positions by means of an electromagnetic field, in particular the toothed disk of a magnetically actuated brake or clutch, according to the preamble of claim 1 and EP 2 002 142 A1.

This document describes a so-called safety brake, in which a coupling piece, in the case shown with a toothing, by electromagnetic forces between a position corresponding to the locked position, and a position corresponding to the released position, can be moved back and forth , There are also similar devices which have other fixation means instead of gearing and / or use springs or other instead of the electromagnetic forces in either direction.

Such brakes are used variously, for example in door operators for railway doors, but also in lift doors, and can also be used in elevators, cables and any type of force or torque transmission. There are bistable arrangements in which it is ensured by permanent magnets or mechanical fixings that a once taken end position is met until the next switching pulse, and there are monostable versions in which the one end position is assumed as soon as the electromotive force is eliminated, it is desired be it in the course of a fault. Which of these brakes is used depends on the particular field of application and the safety philosophy of the user.

For all these types of brakes, it is important to communicate the current (current) position of a control device to monitor that position and then control the operation of the entire brake related system thereafter. Such monitoring of the actual state, independent of the switching commands of the past, is essential both for the sequence of the various operating steps to be performed and for the safety, and it must therefore be ensured that this detection takes place reliably and without interference. In the prior art, this has been achieved in that the movable part of the brake has been fixedly provided with an arm or the like, possibly also in one piece, and that at the end of the arm, which thus inevitably moves with the movable part, contacts, actuating means (pins or the like) are provided, which contacted a correspondingly opposite fixedly mounted switch, plug or the like and so closed or opened a circuit or, which was variously desirable for control engineering reasons, served several such switching elements, although quite a few opened and others could be closed , depending on their position and effect in one of the control or control circuits.

This concept, which has the great advantage of being directly connected to the moving part and thus directly reflecting its position, has the disadvantage that the movement of the moving part is dictated by its function of engagement or release, and thus to mechanical, dynamic , electrical or other sensitivities and limits of the sensor part can not take into account. In particular, although not exclusively, the speed of movement of the moving component is well above the permissible for the used and usable switch relays switching speeds. The consequence is the need to provide levers and the like which reduce the speed (s) of the moving component, but which in turn proportionally reduces the distances traveled by the contactors and, in turn, makes more sensitive or more sensitive switches, etc. necessary. Moreover, the moving parts of the immediacy that is sought are contradictory and costly. Derlei is known from the JPS61211539 (A). Although the DE 91 11 784 Ul and also US 3,400,797 A avoid the levers, etc., but set the switch but the direct effect of the moving part.

Another possibility is the use of non-contact switch, as known from DE 10 2006 004 065 AI, DE 20 2005 009 053 Ul and DE 199 22 251 AI. The problems involved are in the characteristics of the hysteresis of the proximity switch and the stroke of the movable part and the influence of the proximity switch s by other elements and also impurities in rough operation. It is known from WO 97/42118 AI in an elevator brake, thus in a well-defined and protected environment, to control the magnetic force accordingly, in order to achieve a smooth retraction of the movable member. This measure is complicated and requires fine adjustment and maintenance in the inevitable change in mechanical properties during operation, not to mention changes in the outdoors, for example.

There is thus a need for a simple, compact, reliable and as far as possible to be adapted to the switch to be used monitoring device, by which it should also be possible to use different sensors without complex changes and adjustments, to pursue different strategies to consider different mounting options , because there are different wishes, depending on the customer. It is the object of the invention to provide such a device.

According to the invention, this object is achieved by the features stated in the characterizing part of claim 1; in other words, it is provided for detecting the position of the movable member, a separate detector plate which can move with respect to the movable coupling part in the direction of its mobility. In this case, the detector part, as well as the coupling part, under the action of the coupling part moving electromagnetic field, and it is optionally provided between the coupling part and the detector part, a compression spring.

In this simple way it is ensured that by the mass and the structure of the detector plate, the effect of the electromagnetic force on them, ie their acceleration with additional consideration of the mass and the final speed on the available path, can be determined, the compression spring or Compression springs are provided between the two movable plates in accordance with the forces and the paths to be traveled and whose characteristics are determined. The invention is explained in more detail below with reference to an embodiment. 1 shows a purely schematic section through a device according to the invention in the coupled state and FIGS. 2 and 3 in the uncoupled state:

A selected as an example brake 1 is attached with a wing 2 or another mounting part fitting the carbody or door frame, not shown, and carries in its interior a shaft 3 which is rotatable about an axis 4. The shaft 3 is rotatably and axially fixed to a ring gear 5 (Fig. 2) connected and has at its other end a connection with a freewheel 6, which in turn sits on an actuating shaft, not shown.

This device is used for example in the operation of railway doors to a rotation of the actuating shaft in the direction in which the freewheel allows it (usually the closing direction of the door) always allow a rotation in the opening direction but to prevent. Now, if a rotation in this direction, which does not allow the freewheel 6, is desired, the brake 1, that is in detail the toothed disc 5, released, and the actuating shaft can then including freewheel and shaft 3 and toothed disc 5 in the other Turn direction.

To effect this release, a counter-disc 7 is rotatably disposed in the brake 1, but in the direction of the axis 4, is movable between two positions. Fig. 1 shows the closed or blocking position in which a ring gear of the movable disc 7 meshes with the teeth of the toothed disc 5 and therefore prevents them from any rotation. Fig. 2 and Fig. 3 show the situation in the released state in which the disc 7 has been pulled by electromagnetic forces of a magnet 8 so far to the right in the figures that the toothings of the two tooth combs are disengaged, the toothed disc 5 and thus the shaft 3 can rotate freely. When switching off the magnet 8, the movable disk 7 is urged by springs 9 again in the blocking position. Here, the introductory applies that instead of this monostable training by providing permanent magnets or the like, a bistable design is possible; However, this has nothing to do with the invention explained in more detail below with reference to this example. In order to be able to report the current position of the movable disk 7 to a corresponding control device or control device (not shown), a detector disk 10 is provided which, like the movable disk 7, is mounted non-rotatably with respect to the brake 1, but in the direction of the axis 4 is mobile. This detector disc 10 is now attracted by the magnet 8 as well as the movable disc 7, but has such a magnetic property and such a mass that in the case of activation of the magnet 8 and the movement of the movable disc 7 their own movement only one speed which is low enough to not stress the actual switch (hereinafter referred to as whatever it is constructed) 11 in contact with its contact projection (s) 12 beyond its (their) stability. This situation is shown in FIG.

The switching process of the magnet can also be made plausible by means of current measurement. The switching process is defined by a characteristic current profile.

When the electromagnet 8 is switched off, the compression springs 9 in turn push the movable plate 7 into the locked position (FIG. 1), and the intermediate springs 13 or suitably arranged permanent magnets or another repulsion element press the detector disc 10 together with its switching finger arm 12 'from the switch 11 away, which forwards this movement or reaching the end of this movement to the control device.

These elements 13 are to be dimensioned in their characteristic curve and in their maximum extent such that, in the event of a fault, for example if, despite the switching off of the magnet 8, the movable disk 7 does not reach the locked position (FIG. is not pushed away from the switch 11, not erroneously the locked state is reported. With knowledge of the invention and the components used and the field of application, this can easily be determined by calculation, possibly a few simple tests, by a person skilled in the art.

Conversely, in spite of switching on the magnet 8, the movable disk 7 does not disengage, as a result of the resilient elements 13, the contact 12 also does not get into it Area of the switch 11, whereupon this still reports that there is still the locked position.

The invention can be designed in many ways and adapted to the respective field of application. Knowing the invention, it is clear to those skilled in the control of control technology in the field of electromagnetically operated devices to select the appropriate parameters, in particular he has the spring elements 13, the mass of the detector disk 10, the distance to the magnet 8, the magnetic properties the detector disk 10 and this in each vote with mass and magnetic properties of the movable disk 7 and the strength of the return spring 9 make.

Finally, it can be stated that the invention relates to a device for detecting the instantaneous position of an object or component 7 which can be moved back and forth between two positions by means of an electromagnetic field, in particular the movable counter disk of a toothed disk 5, a magnetically or electromagnetically operable brake 1 or Coupling, in particular in the door drive of a vehicle such as a railway car concerns. To protect the contact projections 12 of the switch 11 used in this case, a separate detector part 10 is provided for detecting the position of the movable member 7, which can move with respect to the movable member 7 in the direction of its mobility, that the detector part 10, as the movable component 7, is under the action of the component 7 moving electromagnetic field, and that the detector part 10 in one of the two positions by means of a Schaltfingerarms 12 'at least one contact projection 12 of the switch 11 contacted and in the other distance from it. Reference sign list:

Brake 08 electromagnet

Wing 09 springs

Wave 10 detector disk

Axis 11 switch

Sprocket, toothed pulley 12 contact projection

Freewheel 12 'shift finger arm

Counter-disc, movable 13-spring elements disc

Claims

Claims:

Anspruch [en] A device for detecting the instantaneous position of an object or component (7) which can be moved back and forth between two positions by means of an electromagnetic field, in particular the movable counter-disk of a

Toothed disk (5), a magnetically or electromagnetically operable brake (1) or clutch, in particular in the door drive of a vehicle such as a railway car, characterized in that for detecting the position of the movable member (7) has its own detector part (10) that is movable with respect to the movable member (7) in the direction of its mobility, that the detector member (10), like the movable member (7), is under the action of the electromagnetic field moving the member (7), and that the detector part (10) in one of the two positions by means of a Schaltfingerarms (12 ') contacted at least one contact projection (12) of a switch and in the other distance from it.

2. Apparatus according to claim 1, characterized in that between the movable member (7) and the detector part (10) is provided a pressure element which comprises at least one compression spring (13).

3. A device according to claim 1, characterized in that between the movable member (7) and the detector part (10) is provided a pressure element which comprises at least one permanent magnet.

4. Device according to one of claims 1 to 3, characterized in that the detector part (10) occupies the contacting position when applied electromagnetic field.