EP0894761A1 - Limit switch apparatus for hydraulic elevators - Google Patents

Abstract

A device for generating function signals for an elevator control to control an elevator car (1) at connection points in a building comprises an upper cam (3) and a lower cam (4) for mounting on a wall (2a, 2b) in one Elevator shaft (2), which are arranged at an upper point and at a lower point, an upper switch (5) and a lower switch (8) for mounting on the elevator car and for connection to an electrical power source, and an interface circuit that with the switches is connected. The interface circuit has a lower limit relay coil, an upper limit relay coil, normally closed riser relay contact sets and normally closed drop relay contact sets which cooperate with the switches (5, 8) to provide upper and lower limit function signals for controlling the car movement and upper and lower delay signals for controlling the elevator car speed produce.

Description

The present invention relates generally to hydraulic lifts and in particular a limit switching device for Use in hydraulic elevator cabins.

Limit switches are commonly used for Hydraulic lifts in large numbers at every junction arranged the wall of the elevator shaft. This Terminal limit switch assemblies make normal Stop connection, emergency connection delay and Limiting functions ready, as provided by a code be requested. The number of switches used is depending on the arrangements of the elevator code that the Setup controls (such as A17.1, CSA, or local) and from the cabin speed. For example, a maximum of seven switches required for some facilities be and a minimum of four switches for others Facilities. The switches in the elevator shaft are on respective connection points and are connected by a of the cabin-mounted cam actuated. Every switch has about a specific function and operational sequence.

At some institutions, these are Limit switch on the cabin by means of transmission the upper and lower limit switch assemblies from the elevator shaft wall to the exterior of the cabin assembled. DE 2 262 396 shows cabin-mounted Position indicators by a cam or a Magnets are operated, with different levels detected be used for different operating modes become.

DE 37 04 291 shows a hydraulic elevator car with limit switches mounted thereon, the switches due to shaft-mounted magnets for the detection of floors be operated.

SUMMARY OF THE INVENTION

The present invention relates to a device for Generation of function signals for an elevator control for controlling an elevator car at connection points in one Building. The device comprises: an upper cam and one lower cam for mounting on a wall in one Elevator shaft at a top stop or one lowest stop; an upper switch and one lower switch for mounting on an elevator car, which itself moved in the elevator shaft, and a latch circuit with inputs for connection to an elevator assigned Control to provide an upward signal received, which is an upward direction of movement represents the elevator car in the elevator shaft, and a Lowering signal, which is a downward direction Direction of movement of the elevator car in the elevator shaft represents, the latch circuit with the upper Switch and the lower switch is connected, and wherein the locking circuit outputs for connection to the Has control for generating function signals, whereby when the upper and lower cams on the wall of the Elevator shaft at the top stop or the lowest stop are mounted and the top and lower switch on the elevator car in the vertical direction in spaced relationship are mounted, the Locking circuit on the riser signal and the Actuation of the upper switch by the upper cam responds to a rise delay signal to control the Generate elevator car speed, taking the Locking circuit on the riser signal and the Actuation of the lower switch by the upper cam responds to a climb limiting function signal Generate control of elevator car movement, taking the Locking circuit on the lowering direction signal and the Actuation of the upper switch by the lower cam responds to a lowering limit function signal Generate control of elevator car movement, and being the locking circuit on the lowering direction signal and the actuation of the lower switch by the lower cam responds to a lowering delay function signal Generate control of elevator car speed.

It is an object of the present invention to determine the number Limit switches that reduce in one Elevator shaft for connection control of the elevator car is required.

It is another object of the present invention that Amount of wiring in a hydraulic elevator to reduce.

BRIEF DESCRIPTION OF THE DRAWINGS

Figur 1

eine ausschnittsweise Aufrißansicht einer Hydraulikaufzugskabine mit einer erfindungsgemäßen Begrenzungsschaltvorrichtung,

Figur 2

ein schematisches Diagramm der Steuerschaltung für die in Figur 1 gezeigte Begrenzungsschaltervorrichtung,

Figur 3

eine Fortsetzung des in Figur 2 gezeigten schematischen Diagrammes,

Figur 4

eine Tabelle der Zustände des in Figur 3 gezeigten Einzelstapellogikblocks, und

Figur 5

eine Tabelle der Zustände des in Figur 3 gezeigten Einzelstapellogikblocks.

The above as well as other advantages of the present invention will become apparent to those skilled in the art from the following detailed description of a preferred embodiment with reference to the accompanying drawings, in which:

Figure 1

2 shows a sectional elevation view of a hydraulic elevator car with a limit switching device according to the invention,

Figure 2

1 shows a schematic diagram of the control circuit for the limit switch device shown in FIG. 1,

Figure 3

a continuation of the schematic diagram shown in FIG. 2,

Figure 4

3 shows a table of the states of the single stack logic block shown in FIG. 3, and

Figure 5

a table of the states of the single stack logic block shown in Figure 3.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Depending on the code requirements and the A hydraulic elevator can reach cabin speeds of up to seven Limit switches require. At the top stop These switches can include for actuation purposes: Delayed ascent (USD), first emergency stop delay (ETS1), second emergency stop delay (ETS2) and climb limitation (UL). These switches can be closed at the bottom stop Actuating purposes include: lowering delay (DSD), third Emergency stop delay (ETS3) and lowering limit (DL).

According to the invention is a single limit switch arrangement mounted on an elevator car. There is a cam in that Shaft arranged at every junction. So that is Limit switch arrangement easier to install and the total number of cables to the elevator control too lead is reduced. The climb delay (USD) and the lowering limit (DL) functions are in one Switches using the relays for the High speed rise / lowering valve coils grouped to determine the correct switching function (USD or DL). The Lowering Delay (DSD) and Rise Limiting (UL) functions are similarly in a single switch combined. The present invention uses a system of electrical interlocks, which reduce the Number of limit switches required, and to a maximum of five and a minimum of two. The USD and DL functions are in one switch summarized and the DSD and UL functions can be combined in one other switches can be summarized.

To summarize the functions specified above two obstacles to be overcome. A first obstacle consists of knowing in which direction the cabin is heading moves so that the correct function is selected, and that second obstacle is multiple switching or - Voltages through the same choke or switching point, namely to operate the limit switch. Both of these Obstacles are overcome by using an electrical Interlock overcome.

The elevator car can only be in the climbing direction move when the high and / or Low speed "rise" circuits of the Hydraulic control valves are open. When a Hydraulic line breakage can affect the elevator car just move in the downward direction, if the high and / or Low-speed "lower" circuits or circuits of the Control valves are open. The interlock circuit defines which function (USD or DL, UL or DSD) the Operate the limit switch. A second purpose of Interlock circuit is the two functions of isolate each limit switch, making it possible multiple circuits and voltages across the same Limit switch.

In Figure 1, a hydraulic elevator car 1 is shown, which in a substantially vertical direction in one Elevator shaft 2 is movable. An upper (climb) cam 3 and a lower (lower) cam 4 are on a wall of the Elevator shaft 2 adjacent to a movement path of the car 1 mounted. The upper cam 3 is on a first one Shaft wall section 2a mounted at the upper stop and the lower cam 4 on a second shaft wall section 2b at the bottom stop.

A variety of normally closed ones Limit switch is on an outside wall of the cabin 1 arranged for actuation by cams 3 and 4. A first uppermost switch 5 is opposite to cabin 1 mounted at an upper end thereof and fulfills the functions the climb delay (USD) and the lower limit (DL). A second switch 6 is on the cabin 1 in a predetermined Distance installed below the first switch 5 and met the function of the first emergency stop delay (ETS1). A third switch 7 is on the cabin 1 with predetermined Distance mounted below the second switch 6 and fulfills the function of the second emergency stop delay (ETS2). A fourth or bottom switch 8 is on the Cabin 1, adjacent to a lower end thereof, assembled and fulfills the functions of lowering delay (DSD) and Rise limitation (UL). A fifth switch 9 is on the Cabin 1 at a predetermined distance above the fourth Switch 8 mounted and fulfills the function of the third Emergency stop delay (ETS3). The two switches 5 and 8 replace four separate switches as you did with the Elevator limit switch control according to the prior art required are.

In Figure 2, a latch circuit 10 is shown to the Define functions by switches 5 and 8 be fulfilled according to the invention. The latch circuit 10 is connected to a power supply (not shown), and with the normally closed switches 5 and 8 via a connecting strip 11 with a variety of Connections 11a to 11n. A current input line 12 is on a terminal 11i of the terminal strip 11 for maintenance electrical voltage with positive polarity any suitable voltage (+ V) connected, one Current return line 13 connected to the terminal 11n is. Terminal 11i is via a power distribution line 14 in the circuit 10 with a pair of terminals 11h and 11j connected. The connection 11h is via the first switch 5 with a terminal 11g and the terminal 11j is over the fourth switch 8 connected to a terminal 11k. Consequently the electrical current and the state of the switches 5 and 8, namely open or closed, in the Locking circuit 10 at the terminals 11g and 11k entered.

A pair of normally open relay contacts 15 one lower limit (KLL) relay is between terminal 11a and a connection 11b connected, the connections with the elevator control (not shown) are connected. The Contacts 15 are through a lower limit (KLL) relay coil 16 controlled, one with the ground connection 11n connected connecting strap and another connecting strap has that with the connector 11g via a normally closed step relay initial contact set (UPS) 17 connected is. An anode of an isolation diode 18 is connected to the Contact set 17 connected, wherein a cathode with the coil 16th connected is. The connection of the relay coil connection tab with the diode cathode is over with a + V voltage connection a normally closed step relay second contact set 19 and a pair of normally open KBPD relay contacts 20 connected. A diode 21 is related to the Relay coil 16 switched and opposite to the + V power supply polarized to dissolve the collapsing field, which occurs when the switch 5 is opened. A Resistor 22 and a light emitting diode 23 are connected in series with respect to the relay coil 16 by one provide visual indication that current is flowing through the Relay coil flows. A normally closed first Sink relay contact set (DNS) 24 is between port 11g and a terminal 11f switched. Furthermore is a first voltage divider resistor network 25 between the Terminal 11g and system ground switched to one to generate graded signal at a connection A.

A pair of normally open relay contacts 26 one upper limit (KUL) relay is between one connector 11c and a connection 11d connected, the connections are connected to the elevator control (not shown). The Contacts 26 are through an upper limit (KUL) relay coil 27 controlled, one with the ground connection 11n connected connecting tab and another with the Port 11k through a normally closed second Sink relay contact set (DNS) 28 connected connection plate having. An anode of an isolation diode 29 is connected to the Contact set 28 switched, a cathode with the coil 27 is connected. The connection of the Relay coil connection tab and the diode cathode is with a + V power connector through one normally closed third step relay contact set 30 and a pair connected by normally open KBPU relay contacts 31. A diode 32 is connected with respect to the relay coil 27 and polarized opposite to the + V power supply to that coincident field to dissipate when the switch 8 is opened. A resistor 33 and a light emitting Diode 34 are in series with respect to relay coil 27 to provide a visual indication that Current flows through the relay coil. One usually closed third step relay contact set (UPS) 35 is connected between a terminal 11e and the terminal 11k. There is also a second voltage divider resistor network 36 connected between terminal 11k and system ground to generate a graduated signal at a connector B.

A sink direction relay coil (DNS) 37 is between the connection 11n and a connection 11l for receiving or Record a movement direction signal in the form of electrical current during the lowering movement of the cabin 1 switched. A diode 38 is with respect to the relay coil 37 switched and polarized opposite to the + V power supply, to dissipate the coincident field when the current is switched off. A resistor 39 and one light emitting diode 40 are with respect to the relay coil 37 placed in series to provide a visual display to provide that current flows through the relay coil. A Rise Direction Relay Coil (UPS) 41 is between the Port 11n and a port 11m switched to one Direction of movement signal in the form of electrical current to get during a climbing movement of the cabin 1. A Diode 42 is connected with respect to the relay coil 41 and polarized opposite to the + V power supply to that coincident field to dissipate when the current is switched off. A resistor 43 and one light emitting diode 44 are in series with respect to the Relay coil 41 switched to a visual display to provide that current flows through the relay coil.

The locking circuit 10 is continued in Figure 3, the connections A and B with inputs of a Single stack logic blocks 45 are connected. Logic block 45 has a BPU output that is gated with a first field effect transistor (FET) 46 is connected. The FET 46 and a relay coil (KBPU) 47 are between the + V power supply terminal and the system ground connected in series. A diode 48 is connected with respect to the relay coil 47 and polarized opposite to the + V power supply to that coincident field to dissipate when the power supply is interrupted. A resistor 49 and one light emitting diode 50 are with respect to the relay coil 47 placed in series to provide a visual display to provide that current flows through the relay coil. Of the Logic block 45 also has a BPD output connected to a gate of a second FET 51 is connected. The FET 51 and a relay coil (KBPD) 52 are between the + V power supply terminal and the system ground connected in series. A diode 53 is connected with respect to the relay coil 52 and polarized opposite to the + V power supply to that coincident field to dissipate when the power supply is interrupted. A resistor 54 and one light emitting diode 55 are connected in series with respect relay coil 52 to provide a visual indication that current flows through the relay coil.

The riser valves (not shown) for the Elevator hydraulic circuit are switched by the KUL relay 27 and whose contacts 26 controlled. The lowering valves (not shown) for the elevator hydraulic circuit by the KLL relay 16 and its contacts 15 controlled. Control signals from the elevator control either activate a flush-mounted relay (not shown) and via the connection 11m the UPS relay 41 or activate a DN relay (not shown) and via the Port 11l the DNS relay 37. The normally closed contact sets 17, 19, 24, 28, 30 and 35 act as control contacts for multiplexing the input signals from the first switch (USD / DL) 5 and the fourth switch (DSD / UL) 8.

A direction of climb is determined by the controller initiated, which generates a signal at the terminal 11m to to supply the relay coil (UPS) 41 with power, the normally closed contact sets 17, 19 and 35 be opened. Now the USD / DL switch 5 leads one High speed relay circuit over the normally closed contact set 24 of the DNS relay current too. Meanwhile, the DSD / UL switch 8 can only current the KUL relay coil 27 over the normally closed Contact set 28 of the DNS relay and the isolation diode 29 respectively.

A direction of lowering is determined by the control initiated, which generates a signal at the terminal 11l to to power the relay coil (DNS) 37 and the normally closed contact sets 24, 28 and 30 too to open. Now the DSD / UL switch 8 leads High speed relay circuit over the normally closed contact set 35 of the UPS relay current. Meanwhile, the USD / DL switch 5 can only the KLL relay coil 16 current over the normally closed Contact set 17 of the UPS relay and the isolation diode 18 respectively.

A problem would arise if the elevator car 1 there would try either the top connector or the leave bottom port. If the cabin turns to that top terminal has moved, this means that the Limit switches have been defined as USD 8 and UL 5, so the move would end with USD open and UL closed. The switches change so that a return movement takes place their definition and become DL 5 and DSD 8. In this Reverse state is open DL 5 and DSD closed, so that the cabin cannot move. To solve this problem overcome, a pair of bypass signals must be generated which allows the cabin to either look for to move up from the bottom port or the bottom Ground limit, or to move down from that top terminal or top limit.

Logic block 45 shown in FIG. 3 generates a bypass open (BPU) signal (lower limit) and a bypass lower (BPD) signal (upper limit) using the graded voltages of switches 5 and 8, each are connected to the A and B connections. The BPU signal turns on the FET 46 to close the KBPU relay coil 47 activate and close the KBPU contacts 31, whereby Current to the KUL relay coil 27 through the normally closed contact set 30 is created. The BPD signal turns on the FET 51 to close the KBPD relay coil 52 activate and close the KBPD contacts 20, whereby Current to the KLL relay coil 16 through the normally closed contact set 19 is created. The Isolation diodes 18 and 29 isolate the inputs of the Logic block 45 regarding the signals that are generated when the KBPD contacts 20 and the KBPU contacts 31 are closed.

The states of the input signals of switches 5 and 8 and the Bypass signals BPU and BPD, generated by the Single stack logic block 45 are in the table in Figure 4 specified. The USD / DL switch 5 and the DSD / UL switch 8 generate five different input signal combinations at connections A and B. At the upper limit and the lower limit, both switches 5 and 8 are open. The correct BPU and BPD output signals are under Generated using logic block 45 to detect which of the switches first switches from closed to open changed. If the USD / DL switch 5 is opened first, the cabin must be at the upper end of shaft 2, the BPD signal being generated by logic block 45. If the DSD / UL switch 8 is opened first, the Cabin are located on the bottom of the shaft 2, the BPU signal is generated by logic block 45.

When the climb commands and descent commands are generated at the same time logic block 45 will prevent any movement. This operation results from that in the table of FIG. 5 shown information, in which also the states of the rising and lowering relays as well as the KUL and KLL relay coils are shown.

Another problem could arise when power is on first the circuit 10 is applied. The elevator control and the Single batch logic block 45 must be at the current position the cabin 1 in the shaft 2 are synchronized. If the Electricity is applied when the cabin is on one of the Limit positions, the control and the Logic block in an incorrect or faulty state "wake up". To overcome such a condition, a additional signal are generated to indicate which Limiting the cabin is positioned. Such a signal can from the holding system or an additional switch on one Input 51 with respect to logic block 45 are generated.

In summary, the present invention relates to a Device for generating function signals for a Elevator control for controlling elevator car 1 Junction points in a building. The device includes: the upper cam 3 and lower cam 4 for mounting on one Wall 2a and 2b in the elevator shaft 2, each on a top stop and a bottom stop; the upper switch 5 and the lower switch 8 for mounting on the elevator car moving in the elevator shaft; and the locking circuit 10 with inputs 11m, 11l for Connection of a controller assigned to the elevator in order to to get a rise direction signal that goes up for a representative direction of movement of the elevator car representative is, as well as a lowering direction signal, which for a Downward direction of movement of the elevator car in the Elevator shaft is representative, the Locking circuit with the upper switch and the lower switch is connected, and being the Interlock circuit outputs 11a-11f for connection with the controller has to generate function signals, whereby when the upper and lower cams on the wall of the Elevator shaft at the top stop and the bottom stop are mounted, and if the top and lower switch on the elevator car in vertical from each other spaced relationship are mounted that Locking circuit on the riser signal and the Actuation of the upper switch by the upper cam responds to a climb delay function signal generate, to control the elevator car speed, the latch circuit on the riser signal and an actuation of the lower switch by the upper one Cam responds to provide a climb limit function signal To generate control of the elevator car movement, the Alternating locking circuit on the lowering direction signal and actuation of the upper switch by the lower cam responds to a lowering limit function signal To generate control of elevator car movement, and wherein the locking circuit on the lowering direction signal and actuation of the lower switch by the lower cam responds to a lowering delay function signal Generate control of elevator car speed.

According to the provisions of patent law, the present invention with reference to its preferred Embodiment described. However, it should be mentioned that the Invention may be otherwise carried out as specific shown and described without the basic idea or Deviate scope.

Claims (9)

Device for generating function signals for an elevator control for controlling an elevator car (1) moving in an elevator shaft (2) with switching devices (5, 8) arranged on the elevator car (1), which are arranged in the elevator shaft (2) by means of cam devices (3, 4) ) can be operated,
characterized,
that an upper switching device (5) and a lower switching device (8) are arranged on the elevator car (1), each of which can be actuated by means of the upper and / or lower cam device (3, 4) and
that a locking circuit (10) is provided which is connected to the elevator control and to the switching devices (5, 8) and which, depending on direction signals of the elevator control and depending on the actuation of the switching devices (5, 8), has delay signals or limiting signals for controlling the elevator car ( 1) generated. Device according to claim 1,
characterized,
that the interlocking circuit (10) has circuits which, in the event of an ascending direction signal from the elevator control and upon actuation of the upper switching device (5) by means of the upper cam means (3), generate an ascending delay signal for controlling the elevator car (1) and which in the event of an ascending direction signal from the elevator control and Actuation of the lower switching device (8) by means of the upper cam device (3) generate a climb limitation signal for controlling the elevator car (1) or which when the lower control device (8) is actuated and when the lower switching device (8) is actuated by the lower cam device (4) generates a lowering delay signal Generate control of the elevator car (1) and which generate a lowering limit signal for controlling the elevator car (1) in the event of a lowering direction signal from the elevator control and when the upper switching device (5) is actuated by means of the lower cam device (4). Device according to claim 2,
characterized,
that the latch circuit (10) has a lower limit relay coil (16) and a rising direction relay coil (41) with a set of normally closed contacts (17, 19, 35) connected between the upper switching device (5) and the lower limit relay coil (16) wherein the ascending direction relay coil (41) is responsive to the ascending direction signal to open the contacts (17, 19, 35) during an upward movement of the elevator car (1). Device according to claim 2,
characterized,
that the locking circuit (10) has an upper limit relay coil (27) and a lowering direction relay coil (37) with a set of normally closed contacts (24, 28, 30), which are connected between the lower switching device (8) and the upper limit relay coil (27) wherein the lowering direction relay coil (37) is responsive to the lowering direction signal to open the contacts (24, 28, 30) during the lowering movement of the elevator car (1). Device according to claim 2,
characterized,
that the locking circuit (10) has a logic device (45) which is connected to the upper switching device (5) and the lower switching device (8), the logic device (45) being actuated by the upper and lower switching devices (5, 8) responds in order to generate bypass signals (BPU, BPD) which are representative of an actuation sequence of the upper and lower switching devices (5, 8) by the upper and lower cam devices (3, 4). Device according to claim 5,
characterized,
that the logic means (45) is responsive to actuation of the upper switch means (5) prior to actuation of the lower switch means (8) to bypass signals as a logic "0" bypass rise signal (BPU) and as a logic " 1 "bypass lowering signal (BPD). Device according to claim 5,
characterized,
that the logic means (45) is responsive to actuation of the lower switch means (8) prior to actuation of the upper switch means (5) to bypass signals as a logic "1" bypass rise signal (BPU) and a logic "0 "Bypass sink signal (BPD). Device according to claim 5,
characterized,
that the logic device (45) has a bypass rising relay coil (47) with a pair of normally open contacts (31), which are connected between a current source (+ V) and the upper limit relay coil (27) and upon actuation of the lower switching device ( 8) before actuating the upper switching device (5) to close contacts (26). Device according to claim 5,
characterized,
that the logic device (45) has a bypass Senkrelaiss coil (52) with a pair of normally open contacts (20) which are connected between a current source (+ V) and a lower limit relay coil (16) and upon actuation of the upper switching device ( 5) before actuating the lower switching device (8) to close contacts (15).

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