EP3622546A1 - Safety and/or signaling switch for an automated industrial plant, and assembly consisting of at least one safety and/or signaling switch of said type and a rip cord - Google Patents
Safety and/or signaling switch for an automated industrial plant, and assembly consisting of at least one safety and/or signaling switch of said type and a rip cordInfo
- Publication number
- EP3622546A1 EP3622546A1 EP18722039.7A EP18722039A EP3622546A1 EP 3622546 A1 EP3622546 A1 EP 3622546A1 EP 18722039 A EP18722039 A EP 18722039A EP 3622546 A1 EP3622546 A1 EP 3622546A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- safety
- signaling switch
- rocker
- signaling
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/022—Emergency operating parts, e.g. for stop-switch in dangerous conditions
- H01H3/0226—Emergency operating parts, e.g. for stop-switch in dangerous conditions operated by a pull cord
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H23/00—Tumbler or rocker switches, i.e. switches characterised by being operated by rocking an operating member in the form of a rocker button
- H01H23/02—Details
- H01H23/025—Light-emitting indicators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H23/00—Tumbler or rocker switches, i.e. switches characterised by being operated by rocking an operating member in the form of a rocker button
- H01H23/02—Details
- H01H23/12—Movable parts; Contacts mounted thereon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H23/00—Tumbler or rocker switches, i.e. switches characterised by being operated by rocking an operating member in the form of a rocker button
- H01H23/24—Tumbler or rocker switches, i.e. switches characterised by being operated by rocking an operating member in the form of a rocker button with two operating positions
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/965—Switches controlled by moving an element forming part of the switch
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/965—Switches controlled by moving an element forming part of the switch
- H03K2217/9658—Safety, e.g. fail-safe switching requiring a sequence of movements
Definitions
- Security and / or signaling switch for an industrial automation system and arrangement of at least one such safety and / or signaling switch and a ripcord
- the invention relates to a safety and / or signaling switch for an industrial automation system with at least one attachment for a ripcord.
- the invention further relates to an arrangement with at least one such safety and / or signaling switch and at least one ripcord.
- At least one safety and / or signaling switch is arranged in the area of the automation system whose actuation leads to an immediate standstill of the automation system or the automation system in set a safe, for example, greatly slowed down mode of operation.
- the safety and / or signaling switch can be read out, for example, from a controller or a safety controller of the automation system with high priority, so that its operation necessarily leads to stopping or to taking a safe operating mode.
- such an arrangement of a switch with a ripcord can also be used for process optimization.
- a safety and / or signaling switch can also be used in the context of a process optimization.
- An embodiment of a safety switch is known, for example, as an emergency stop button.
- an emergency stop button In the case of larger systems, several such emergency stop buttons may be present, which are evaluated individually or interconnected so that each of the switches can be used to stop the system or to assume the safe operating state.
- safety and / or signaling switches are known, which are for coupling with a ripcord made- are formed.
- the ripcord may for example be arranged along an automation system at head height, so that it can be easily reached in the entire area in which it runs.
- the ripcord is, for example, with one of its ends fixedly mounted on the system and coupled with the other end to the safety and / or signaling switch, as a
- Cable pull switch is formed. If pulled anywhere on the ripcord, this train transfers to the safety and / or signaling switch, which is actuated thereby.
- a signal lamp On the housing of the security and / or signaling switch, a signal lamp may be arranged to signal a successful actuation of the security and / or signaling switch and thus the area from which the security request or the signaling e.g. for process optimization is done, to be able to locate quickly.
- It is known, on the housing of the safety and / or signaling switch for example. to arrange an eyelet as an attachment point for another ripcord, which then in turn reaches to the actuator of the next safety and / or signaling switch to which it is connected.
- a chain can be formed in each case by a ripcord and an associated safety and / or signaling switch, which can, for example, be led around this automation system around an entire automation system or a subarea.
- the known safety and / or signaling switches have an actuating element which is mounted linearly displaceable and is acted upon by a spring bias.
- an eyelet is attached, in which the ripcord can be hooked. A pull on the pull cord and thus the eyelet pulls the actuator so far out of the housing until it actuates a mechanical contact switch, which is arranged in the housing, and abuts against a stop.
- This structure is mechanically complex, in addition, care must be taken that the linear guide of the actuator is not hooked, so that in an emergency, the safety and / or signaling switch is not blocked.
- a regular operation is useful or even required to the contact elements free of oxide by the operation and the associated mechanical friction effect of the contact elements of the contact switch. layers that could otherwise lead to insecure contact.
- An inventive safety and / or signaling switch is characterized in that it has a pivotally mounted rocker, which is coupled to the at least one mounting option for the ripcord.
- at least one acceleration sensor is arranged in or on the rocker, such that a movement of the rocker can be detected on the basis of an evaluation of signals of the acceleration sensor.
- a movement of the rocker which results from a train on a coupled safety ripcord, can be detected without a mechanical contact being actuated.
- the risk of contact fusing or sticking of the contacts or poor contact due to a formed oxide layer on contact surfaces is not given, which is why the safety and / or signaling switch according to the invention offers a high degree of operational reliability.
- the mechanical structure of the safety and / or signaling switch is also very simple, the risk of blocking due to contamination or the like. in the pivoting motion, e.g. with a linear sliding movement is low. Accordingly, a high level of functional reliability is also given with regard to the mechanics.
- an MEMS (Micro Electro Mechanical System) - Sensor used in an advantageous embodiment of the safety and / or signaling switch.
- MEMS Micro Electro Mechanical System
- Such sensors are small and inexpensive due to the integrated production of mechanical and electrical components.
- MEMS acceleration sensors are now used in large numbers in mobile electronic devices such as smartphones, making them good and cost-effective.
- the safety and / or signaling switch has an evaluation circuit, which evaluates a signal of the acceleration sensor and outputs a switching signal.
- the evaluation circuit comprises at least one threshold value detector for the signal of the acceleration sensor. Due to the evaluation circuit integrated in the safety and / or signaling switch, the acceleration information measured by the sensor can be converted directly into a switching signal that is output.
- the safety and / or signaling switch is compatible with known safety and / or signaling switches which have mechanically moved contact switches.
- the evaluation circuit has at least two threshold value detectors for the signal of the acceleration sensor, whereby it is possible to distinguish between at least two different degrees of pivoting movements of the rocker.
- a stepwise reaction of the automation system can be converted to an operation of the ripcord.
- the automation system are switched only in a slowed down and thus safe mode, whereas it stops immediately at a violent pull on the ripcord.
- the evaluation circuit comprises a time detection element which determines a time which is between a response of a first and a second threshold value detector. For example, it is possible to determine the time between the deflection of the rocker after actuation and the striking of the rocker at maximum swing angle.
- the first threshold detector monitors the exceeding of a first, eg positive threshold, which corresponds to an acceleration in a first direction.
- the second threshold detector monitors the undershooting of a second, negative threshold which corresponds to an acceleration in a second direction opposite the first direction, ie a deceleration.
- the rocker spring biased biased in a basic position From this basic position, the tilting of the rocker, which can be detected via the acceleration sensor, then takes place when pulling on the ripcord.
- two mounting options e.g. Eyelets, arranged for each a ripcord on opposite sides, wherein the rocker is pivotable from the basic position to both sides.
- the evaluation circuit is further preferably configured to differentiate, based on the signal of the acceleration sensor, to which of the two sides the rocker pivots.
- a safety and / or signaling switch with only one acceleration sensor and only one evaluation circuit monitor two ripcords and also selectively detect which of the two ripcords is operated.
- the safety and / or signaling switch has at least one signal lamp for signaling a switching state of the safety and / or signaling switch.
- the security and / or signaling switch can be coupled on both sides with ripcords, preferably at least two signal lamps are provided, which are each assigned to one of the two sides of the rocker in order to signal which of the two ripcords has been actuated.
- the safety and / or signaling switch has a connection for an industrial field bus for transmitting a switching state of the safety and / or signaling switch. It can be provided that an existing signal lamp is also controllable via the industrial fieldbus.
- An arrangement according to the invention comprises at least one such safety and / or signaling switch and a ripcord which is connected to the safety and / or signaling switch. It turns out the advantages mentioned in connection with such a security and / or signaling switch.
- At least two safety and / or signaling switches are provided, with one ripcord leading from each of the two safety and / or signaling switches to a safety light which has corresponding fastening possibilities for the ripcord and which has at least one signal lamp.
- a safety and / or signaling switch which can be coupled on both sides of the rocker with a ripcord, thus a chain of ripcords can be formed in which safety and / or signaling switches and (simpler ) Safety lights alternate.
- the safety lights provide only mounting options and signal lamps, but are not designed to detect an operation of the ripcords. Nevertheless, using signal lamps of the safety and / or signaling switches and the safety lights, the actuated portion of the ripcord chain can be clearly identified.
- An advantageous suitable safety luminaire has e.g. a connection for an industrial fieldbus and is set up to control the at least one signal lamp via the industrial fieldbus.
- FIG. 1 shows a schematic side view of a safety and / or Signali- stechniksschalters.
- Figure 2 is a schematic representation of an arrangement with two safety and / or signaling switches and a signal light and a plurality of ripcords.
- Fig. 3 is a schematic side view of the safety light used in Fig. 2.
- the carrier 1 shows, in a schematic side view, a safety and / or signaling switch 10 mounted on a carrier 1.
- the carrier 1 is, for example, part of an automation system not shown here.
- the safety and / or signaling switch 1 0 hanging down to the support 1 is attached.
- the safety and / or signaling switch 1 0 will be referred to below as a switch 1 0.
- the switch 1 0 has a base plate 1 1, with which the switch 1 0 is fixed to the support Approximately in the middle (seen in the longitudinal direction of the base plate 1 1), a pivot joint 1 2 is arranged, on which a rocker 1 3 is pivotally mounted on both sides. Between base plate 1 1 and rocker 1 3 two springs 14a, 14b are arranged, which hold the rocker 1 3 with bias in the illustrated (middle) basic position. In this basic position, the rocker 13 with its in Fig. 1 upper side parallel to the base plate 1 1 is aligned. From this basic position, the rocker can be tilted 1 3 on both sides while compressing the respective spring 14a and 14b and relaxing the other spring.
- stop buffer can be arranged, which dampen a striking at maximum deflection.
- eyelets 1 5a, 1 5b are arranged in the pivot plane to each side of the rocker.
- the eyelets 1 5a, 1 5b serve as fastening elements for connecting the rocker 1 3, each with a ripcord 2a, 2b.
- the eyelets 1 5a, 1 5b are arranged on the rocker 1 3 vertically spaced from the pivot joint 1 2, so that a train on one of the eyelets 1 5a, 1 5b to the left or right leads to a tilting of the rocker 1 3.
- ripcords 2a, 2b are represented schematically by dashed lines in FIG. They are connected with their opposite, not visible here free end each with another eyelet. These other eyelets are mounted in the same or at least comparable height above the ground as the eyelets 1 5a, 1 5b of the switch 1 0.
- the pull cords 2a, 2b are not stretched but slightly sagging in an arc. A pull on one of the pull-tabs 2a, 2b downwards at an arbitrary location of the pull-tabs 2a, 2b leads to a pull on the respective eyelet 1 5a, 11b, whereby the rocker 11 is tilted to one side or the other.
- a board 1 6 with electronic components, in particular with an acceleration sensor 1 7 is arranged.
- the acceleration sensor 1 7 is preferably designed as a MEMS sensor. Such a sensor is in able to measure an acceleration acting on it in at least one, possibly also two or more axes.
- an evaluation circuit is further arranged, which detects an acceleration acting on the acceleration sensor and evaluates.
- a threshold value detector may be provided which emits a signal as soon as an (absolute) value of the acceleration detected by the acceleration sensor 17 exceeds or falls below a predetermined value.
- the evaluation circuit including one or more threshold detectors is preferably implemented by a microcontroller.
- the area between the base plate 1 1 and rocker 1 3 may for example be surrounded by a frame or be provided with a bellows, so that the risk of penetration of materials or contaminants in this area, the movement of the rocker 1 3 is reduced.
- the board 1 6 and the evaluation circuit containing it is connected to terminals 18, which allow a coupling of the switch 1 0 to an industrial automation system.
- the terminals 1 8 are arranged on the rocker 1 3 and are therefore moved along upon actuation of the rocker 13.
- the necessary freedom of movement is here in the range of a few millimeters to a maximum of one or two centimeters, whereby the Mitbe terme the connections and the associated cable is not a problem.
- the terminal 1 8 is preferably designed as a field bus connection, which is connected via a field bus to the industrial automation system and are exchanged via the information via a fieldbus protocol.
- the two signal lamps 19 a, 1 9 b are further connected, which are arranged in a relation to the eyelets 1 6 downwardly projecting portion of the rocker 13.
- the two signal lamps 1 9a, 19b are each associated with one side of the rocker 1 3 and suitable to optically signal a response of the switch 1 0 by train on the eyelet 1 5a or 1 5b.
- the signal lamps 1 9a, 1 9b are symbolized in FIG. 1 by switching symbols of incandescent lamps.
- the signal lamps 1 9a, 1 9b are formed by one or more light-emitting diodes.
- the illustrated number of two signal lamps 19a, 19b is purely exemplary. It can also be a single signal lamp or it can be provided more or as two signal lamps. Signal lamps can also be present in different colors in order to signal different operating states of the switch 10.
- An activation of the signal lamps 1 9a, 1 9b can be done directly by the arranged on the board 1 6 circuit after evaluation of the signals of the acceleration sensor 1 7. Alternatively, it can also be provided to control the signal lamps 19a, 19b via the board 16 in response to input signals present at the terminal 18. In such a scenario, a triggering of the switch 10 would be detected by the evaluation circuit on the board 1 6 and passed on the terminal 1 8 to the control system, which then responds and the automation system stops or in a safe mode and simultaneously turn on the terminal 18 and the circuit on the board 1 6, the signal lamps 19 a, 1 9 b turns on.
- an evaluation of the time course and the signal strength of the signal of the acceleration sensor 1 7 can be used, to detect different operating states and output via the port 18. For example, it is conceivable to distinguish a slight pull on the ripcord 2a, 2b from a violent pull on the ripcord 2a, 2b. This can be done based on the height of the measured acceleration values. It is also conceivable to measure via a time detection member a time that passes between the deflection of the rocker 1 3 from the basic position until the rocker attacks 1 3 at maximum deflection to obtain conclusions about the actuation dynamics.
- the automation system can be switched only in a slowed down and thus safe mode, whereas it stops immediately in a violent train.
- a light train may also serve for signaling purposes in process optimization and a firmer train may initiate an emergency shutdown.
- the switch 1 0 may be formed with only one eye 1 5a and 1 5b, to be used only on one side.
- the rocker needs 1 3 to be biased with only one of the springs 14a, 14b, so that it can be deflected from a basic position out in only one direction.
- eyelets 1 5a, 15b may be provided on both sides, and the rocker 13 may be made deflectable in both directions, but only one common signal lamp is present, which then preferably illuminates on both sides. It can be evaluated individually, in which direction a movement of the rocker 1 3 is done.
- FIG. 2 shows an advantageous arrangement of a plurality of switches 10 according to FIG. 1.
- an arrangement with two switches 10 and four ripcords 2a to 2d is shown. With such an arrangement, the possibility of a safety shutdown is provided at a larger automation system along a longer distance at each location.
- the switches 10 are provided in alternation with pure security lights 20.
- Each of the rip cords 2a to 2d is attached to one side of the switch 10 and on the other side to one of the security lamps 20.
- the security lights 20 provide attachment points for the ripcords 2a to 2d ready, but can not detect an operation of the ripcords 2a to 2d itself.
- they additionally have a signaling function in that, similar to the signal lamps 19a, 19b, the switch 10 has corresponding signal lamps (see also FIG. 3).
- Fig. 3 shows a possible embodiment of a safety light 20, as used in the arrangement of Fig. 2.
- the safety light 20 has a base plate 21, with which it can be mounted, for example, on the carrier 1 of the automation system in a manner comparable to that of the switch 10.
- a housing 23 With the base plate 21, a housing 23 is connected, which is formed by its shape similar to the rocker 13 of the switch 10, but is not pivotally mounted.
- Each side of the housing 23, an eyelet 25a, 25b is arranged to secure the ripcord 2a to 2d.
- a terminal 28 is formed, which, possibly via a board 26 with electronic components, in conjunction with signal lamps 29a, 29b, which in a comparable manner as the signal lamps 19a, 19b of the switch 10 each have one side and thus each one eyelet 25a, 25b are assigned.
- the switching state of the switch is detected in the evaluation circuit on the board 1 6 and - preferably using a fieldbus protocol - transferred.
- it may be provided to also make available the signals measured by the acceleration sensor 17 (possibly after preprocessing) at the terminal 18, for example by being retrievable via the fieldbus protocol mentioned.
- This information can be used, for example, to detect irregularities of the automation system, for example unusually high vibrations of the carrier 1, which are transmitted to the acceleration sensor 17.
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Switch Cases, Indication, And Locking (AREA)
- Programmable Controllers (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202017102823.2U DE202017102823U1 (en) | 2017-05-11 | 2017-05-11 | Security and / or signaling switch for an industrial automation system and arrangement of at least one such safety and / or signaling switch and a ripcord |
PCT/EP2018/061415 WO2018206410A1 (en) | 2017-05-11 | 2018-05-03 | Safety and/or signaling switch for an automated industrial plant, and assembly consisting of at least one safety and/or signaling switch of said type and a rip cord |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3622546A1 true EP3622546A1 (en) | 2020-03-18 |
Family
ID=62111083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18722039.7A Withdrawn EP3622546A1 (en) | 2017-05-11 | 2018-05-03 | Safety and/or signaling switch for an automated industrial plant, and assembly consisting of at least one safety and/or signaling switch of said type and a rip cord |
Country Status (4)
Country | Link |
---|---|
US (1) | US20200203090A1 (en) |
EP (1) | EP3622546A1 (en) |
DE (1) | DE202017102823U1 (en) |
WO (1) | WO2018206410A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022112220A1 (en) | 2022-05-16 | 2023-11-16 | Pilz Gmbh & Co. Kg | Actuator, safety system and method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19725491C1 (en) * | 1997-06-17 | 1999-03-11 | Asg Luftfahrttechnik Und Senso | Switch mechanism |
DE29818422U1 (en) * | 1998-10-15 | 1998-12-24 | Kiepe Elektrik GmbH & Co. KG, 40599 Düsseldorf | Cable emergency switching device |
US6501040B2 (en) * | 2001-05-18 | 2002-12-31 | Honeywell International Inc. | Dual directional cable actuated emergency stop device |
-
2017
- 2017-05-11 DE DE202017102823.2U patent/DE202017102823U1/en active Active
-
2018
- 2018-05-03 US US16/609,917 patent/US20200203090A1/en not_active Abandoned
- 2018-05-03 EP EP18722039.7A patent/EP3622546A1/en not_active Withdrawn
- 2018-05-03 WO PCT/EP2018/061415 patent/WO2018206410A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE202017102823U1 (en) | 2018-08-14 |
US20200203090A1 (en) | 2020-06-25 |
WO2018206410A1 (en) | 2018-11-15 |
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