JP2011063419A - Elevator safety control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable elevator safety control device that detects the contact weld of an elevator control circuit in advance. <P>SOLUTION: The elevator safety control device includes a door-opened travel preventing device 4 for monitoring door-opened travel independently from the operation control of an elevator, the door-opened travel preventing device having a monitor 4b for determining the abnormal state of the elevator in accordance with a state monitoring input signal from the elevator input from the elevator control circuit via an input part 4a, a speed computing part 4d for computing the speed and direction of a passenger car in accordance with the input signal, and an output part 4c for determining whether the elevator control circuit should be shut off or not in accordance with the determination result of the monitor part 4b, and a plurality of circuit shut-off means 5 for shutting off the elevator control circuit in accordance with the command of the output part 4c. When the monitor 4b detects the abnormality of the elevator including the door-opened travel or the speed computing part 4d detects the stop of the passenger car, the output part 4c outputs a shut-off command to one of the plurality of circuit shut-off means 5, and outputs the shut-off command to another circuit shut-off means 5 after the lapse of a certain time and to the circuit shut-off means 5 different from the first shut-off during the next shut-off. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an elevator safety control device.

  In recent years, in a method that is independent of elevator operation control, the car has been monitored for door opening while the car door is open, and if such an abnormality is detected, the elevator control circuit is shut off and stopped. Is required by safety standards.

  However, when a normally open contact is detected, when the normally open contact is welded in the safety circuit that shuts off the elevator control circuit when an abnormality such as open door running is detected, the normally open contact is monitored for welding. ing.

  Since the contact welding described above can only be detected when the circuit is interrupted, a method of detecting when the circuit is interrupted when an abnormal running of the elevator is detected is common.

  However, since the normally open contact is in a closed state for a long time until an abnormality is detected, if the welding occurs when the abnormal running of the elevator is detected, the normally open contact that interrupts the circuit is not provided. It will disappear and it will be impossible to stop the elevator.

  For this problem, there is a method in which a plurality of contacts are hardly welded at the same time, and there is a method of interrupting a control circuit by connecting a plurality of contacts in series (for example, see Patent Document 1).

International Publication WO2005-082765

  However, in the technique to cut off the control circuit by connecting a plurality of contacts in series, the contacts which operate initially be borne all blocking load. For this reason, depending on the individual difference of the circuit interrupting means, only one contact will be consumed, and in terms of contact welding frequency, the multiple connection effect of connecting multiple contacts in series to shut off the control circuit is ensured. Sex may not be guaranteed.

  Therefore, the present invention has been made to solve the above-described problems, and before the elevator control circuit is shut off due to abnormality detection, contact welding is detected in advance by periodically shutting off the circuit. An object of the present invention is to provide an elevator safety control device capable of improving the reliability of contact circuit breakage.

  According to one aspect of the present invention, an input unit that inputs a signal necessary for elevator state monitoring from an elevator control circuit that controls the operation of the elevator, and an abnormality of the elevator that includes door-opening traveling by the input signal from the input unit A monitoring unit for determining a state, a speed calculating unit for calculating a speed and a moving direction of a car based on an input signal from the input unit, and an output unit for determining whether the elevator control circuit needs to be shut off based on a determination result of the monitoring unit And a door-opening travel prevention device that monitors door-open travel independently of elevator operation control, and a plurality of circuit shut-off means that shuts off the elevator control circuit according to a command from the output unit, When the unit detects an abnormality of the elevator including door-open running or when the speed calculation unit detects a stop of the car, the output unit A shut-off command is output to one of them, and a shut-off command is output to another circuit shut-off means after a certain time, and the circuit shut-off means that outputs the shut-off command first at the next shut-off is switched from the previous time. An elevator safety control device is provided.

  In the elevator safety control device according to one aspect of the present invention, when the monitoring unit detects a normal state of the circuit interrupting unit, the output unit issues an input command to one of the plurality of circuit interrupting units. It is characterized in that, after a predetermined time, a closing command is output to the next circuit shut-off means, and at the next turn-on, the circuit shut-off means that outputs the closing command first is switched from the previous time.

  Further, in the elevator safety control device according to one aspect of the present invention, the circuit interrupting means has a normally open contact, and the normally open contact of one of the circuit interrupting means is connected in series to the elevator control circuit, The normally open contacts of the other circuit breaker means are connected in parallel, and the output unit switches a cut command to the circuit breaker means connected in parallel depending on the moving direction when the car stops. To do.

  ADVANTAGE OF THE INVENTION According to this invention, the contact welding detection of the safety control circuit of an elevator can be performed in advance, and the reliability with respect to the circuit interruption of a contact can be improved.

It is a schematic block diagram which shows the structure of the elevator safety control apparatus which concerns on this embodiment. It is a flowchart which shows the basic flow which performs contact welding detection. It is a flowchart which shows the flow of the interruption | blocking process in a circuit interruption | blocking means. It is a flowchart which shows the flow of the welding monitoring process in a circuit interruption | blocking means. It is a flowchart which shows the flow of the welding monitoring process in a modification. It is a schematic block diagram which shows the structure of the safety control apparatus of the elevator which concerns on 2nd Embodiment. It is a flowchart which shows the flow of the interruption | blocking process of the circuit interruption | blocking means 5 which concerns on 2nd Embodiment. It is a schematic block diagram which shows the structure of the safety control apparatus of the elevator which concerns on 3rd Embodiment. It is a flowchart which shows the basic flow which performs contact welding detection in the safety control apparatus of the elevator which concerns on 3rd Embodiment. It is a schematic block diagram which shows the structure of the safety control apparatus of the elevator which concerns on 4th Embodiment. It is a flowchart which shows the basic flow which performs contact welding detection in the safety control apparatus of the elevator which concerns on 4th Embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected about the same location and the overlapping description is abbreviate | omitted.

(First embodiment)
FIG. 1 is a schematic configuration diagram illustrating a configuration of an elevator safety control device according to the present embodiment. As shown in FIG. 1, the elevator safety control device is broadly divided into a door open travel prevention device 4 that monitors door open travel and elevator abnormalities independently of the elevator control device, and shuts off the elevator control circuit. The circuit breaker 5 comprises an electric motor 1 for moving the elevator car, a braking device 2 for stopping the electric motor 1, and a power converter (inverter) 3 for controlling the electric current of the electric motor 1.

  Running with door open prevention device 4 includes an input unit 4a, the monitoring unit 4b, an output section 4c and the speed calculator 4d. The input unit 4a inputs, for example, the door opening / closing status, whether the car position is on the landing floor, etc. as signals necessary for elevator state monitoring. Monitoring unit 4b, the signal input from the input unit 4a, is to monitor the abnormal condition of the elevator including a running with door open. The monitoring unit 4b may be configured by physically assembling an electric circuit, or a CPU installed with a monitoring program may be mounted in the monitoring unit 4b. The output unit 4c is for determining the cut-off necessity of an elevator control circuit (not shown) to the elevator conditions monitored by the monitoring unit 4b. The speed calculation unit 4d calculates the moving direction and speed of the car based on the pulse signal from the input unit 4a.

  The circuit shut-off means 5 shuts off the elevator control circuit according to a command from the output unit 4c. For example, the circuit shut-off means 5 is preferably configured as a relay circuit, and a plurality of the same are provided. Each circuit interruption means 5 is assigned a unique number for identification.

Each circuit breaker 5 includes a pair of normally open contacts 5a and normally closed contacts 5b, and has a function of turning off the normally closed contacts 5b when the normally open contacts 5a are welded. Normally open contact 5a is connected in series with the elevator control circuit, the normally closed contact 5b is input to the input section 4a. In addition, the elevator control circuit interrupted | blocked by the normally open contact 5a is the power supply circuit of the electric motor 1 which drives an elevator, and the power supply circuit of the braking device 2 which brakes the electric motor 1, for example.

  In the vicinity of the electric motor 1, a speed governor 6 that is operated in conjunction with a car (not shown) and that keeps the rotation speed of the electric motor 1 constant is disposed. The mechanical rotational displacement of the governor 6 is output as an electrical pulse by the encoder 7. The output from the encoder 7 is taken into the input unit 4 a of the door-opening travel prevention device 4.

  In the control device configured as described above, the monitoring unit 4b monitors the state of the elevator according to the signal state of the input unit 4a of the door-opening travel prevention device 4. When the monitoring unit 4b detects an abnormality in the elevator and the speed calculation unit 4d detects stop of the car from the pulse signal state of the input unit 4a, the output unit 4c is first one of a plurality of circuit interrupting means 5 A shutoff command is output to. After the first shut-off command is output, the shut-off command is sequentially output to another circuit shut-off means 5 at regular intervals. Here, it is preferable that the predetermined time is 10 ms, for example, including the operation time of the circuit shut-off means 5 and the time within the range of the control delay from the abnormality detection to the elevator stop. In the next interruption, the circuit interruption means 5 to which an interruption command is first output from the output unit 4 c is switched so that the load is not biased to the specific circuit interruption means 5.

  FIG. 2 is a flowchart showing a basic flow of detecting contact welding in advance by periodically interrupting the circuit. As shown in FIG. 2, first, the monitoring unit 4b outputs a shut-off command to shut off the circuit shut-off means 5 (step ST21), and then monitors the welding of the normally open contact 5a (step ST22).

  Next, FIG. 3 is a flowchart showing the flow of the interruption process in the circuit interruption means 5. First, the monitoring unit 4b in the door-opening travel prevention device 4 monitors the state of the elevator, and the speed calculation unit 4d monitors abnormality detection or a car stop according to the pulse signal state of the input unit 4a (step ST31).

  If the car is traveling in a normal state (in the case of No determination in step ST31), the output unit 4c outputs an on command to all the circuit interrupting means 5 (step ST32) and continues the elevator traveling.

  On the other hand, when an elevator abnormality such as door-opening traveling or a stop of the car is detected (Yes in step ST31), the output unit 4c first outputs a shut-off command at the time of the previous shut-off. Is read as a cutoff value (step ST33). In the initial stage, the circuit cutoff means 5 that outputs the cutoff command first can be arbitrarily determined. For example, when the circuit breaker 5 is provided with a unique number A and B, respectively, and when the unique number of the circuit breaker 5 that previously output the break command is B, the output unit 4c is connected from B to A. And the circuit interruption command OFF is output only to the circuit interruption means A (step ST34). After output, the unique number A is written as a cutoff value (step ST35). Next, it is determined from the command output to the circuit interruption means A whether or not a predetermined time has elapsed (step ST36). If the fixed time has not elapsed, the system waits until the fixed time elapses, and after the fixed time has elapsed, outputs a circuit cutoff command OFF to the circuit cutoff means B (step ST37). Here, the fixed time is preferably 10 ms, for example, and is preferably set to a time sufficient for the bounce state to settle when the normally open contact 5a is turned on.

  Next, FIG. 4 is a flowchart showing a flow of welding monitoring processing in the circuit interrupting means 5. First, when the circuit breaker 5 is turned off, the monitoring unit 4b monitors whether or not the normally closed contact 5b of the circuit breaker 5 is turned off (step ST41). If the normally closed contact 5b is in an off state (Yes in step ST41), the monitoring unit 4b determines that the circuit breaker 5 is abnormal due to welding (step ST42), and the circuit breaker in order to maintain the elevator stop. 5 is continued (step ST43).

  On the other hand, if the normally closed contact 5b is in an on state (in the case of No determination in step ST41), the monitoring unit 4b determines that the circuit breaker 5 is normal (step ST44) and instructs all the circuit breakers 5 to turn on. Is output to make it possible for the elevator to travel (step ST45).

  According to the first embodiment, it is possible to detect the welding of the contacts in advance before the circuit is interrupted due to the abnormality detection by interrupting the circuit interrupting means when the elevator is stopped. For this reason, it is possible to prevent the situation where the elevator cannot be stopped due to the contact welding despite the abnormality detection. Further, by providing a time difference in the interruption timing of a plurality of contacts, a contact that bears the interruption load is specified, and furthermore, the contact consumption degree can be distributed evenly by switching the contact that bears the interruption load. Therefore, it is possible to reliably secure a life according to the number of contacts that are connected, it is possible to reduce the cost of goods exchange.

(Modification)
In the first embodiment described above, when the monitoring unit 4b executes the welding monitoring of the circuit interruption unit 5 and detects the normal state of the circuit interruption unit 5, the output unit 4c is one of the plurality of circuit interruption units 5. It is also possible to output a closing command and output a closing command to the next circuit shut-off means 5 after a predetermined time, and to switch the circuit shut-off means 5 that outputs the closing command first at the next turn-on.

  FIG. 5 is a flowchart showing the flow of the welding monitoring process in the modification.

  First, when the circuit breaker 5 is turned off, the monitoring unit 4b monitors whether or not the normally closed contact 5b of the circuit breaker 5 is turned off (step ST51).

  If the normally closed contact 5b is in an off state (Yes in step ST51), it is determined that the circuit breaker 5 is abnormal due to welding (step ST52), and the circuit breaker 5 of the circuit breaker 5 is maintained to keep the elevator stopped. The off command is continued (step ST53).

  On the other hand, if the normally closed contact 5b is in an on state (in the case of No determination in step ST51), the circuit breaking means 5 is determined to be normal (step ST54), and the output unit 4c read first unique number of the circuit interrupting means 5 outputs a closing command when turned as input value (step ST55). For example, when the circuit breaker 5 is provided with a unique number A and B, respectively, and when the unique number of the circuit breaker 5 that previously output the break command is B, the output unit 4c is connected from B to A. And the input command ON is output only to the circuit interruption means A (step ST56). After the output, the unique number A value is written as the input value (step ST57). Next, it is determined from the command output to the circuit interruption means A whether or not a predetermined time has elapsed (step ST58). If the fixed time has not elapsed (in the case of No in step ST58), it waits until the fixed time elapses, and after a fixed time has elapsed from the command output to the circuit interruption means A (in the case of Yes in step ST58), the circuit interruption means B Is turned on (step ST59). Here, the fixed time is preferably 10 ms, for example, and is preferably set to a time sufficient for the bounce state to settle when the normally open contact 5a is turned on.

  According to the embodiment according to the modified example, even when the contact is switched on after the monitoring of the contact by the monitoring unit 4b is completed, it is possible to identify the contact that bears the contact load by providing a time difference in the charging timing. By switching the contacts that carry the contacts, the degree of wear of the contacts can be evenly distributed.

(Second Embodiment)
FIG. 6 is a schematic configuration diagram illustrating a configuration of an elevator safety control device according to the second embodiment. As shown in FIG. 6, unlike the first embodiment, the normally open contact 5a connected in series to the elevator control circuit is configured by further connecting the contacts in parallel.

  In the control device configured as described above, the normally open contact 5a of another circuit breaker 5 is connected in parallel to the normally open contact 5a of the circuit breaker 5 connected in series. The speed calculation unit 4d calculates the moving direction and speed of the car based on the pulse signal from the input unit 4a. When the output unit 4c detects the stop of the car, the output unit 4c switches the shut-off command to the circuit shut-off means 5 connected in parallel depending on the moving direction when the car stops.

  FIG. 7 is a flowchart showing the flow of the interruption process of the circuit interruption means 5 according to the second embodiment.

  First, after the monitoring unit 4b outputs a shut-off command, the speed calculation unit 4d determines whether or not the moving direction of the car is UP travel (step ST71). If it is not UP traveling, it is determined whether or not the moving direction of the car is DN traveling (step ST72). If it is not DN traveling, the process returns to step ST71, and if it is DN traveling, it is determined whether or not the car is stopped (step ST73). When the speed calculation unit 4d detects the stop of the car, the output unit 4c reads the previous cut-off value D in order to cut off one side C and D of the circuit cut-off means 5 (step ST74). Next, the cutoff command OFF is switched to the circuit cutoff means C and output (step ST75). After the output, the cutoff value C is written (step ST76). Next, it is determined whether or not a certain time has passed (step ST77). Wait when not reached a predetermined time, after a predetermined time has elapsed, it outputs the cutoff command off to one side D of the circuit breaker unit 5 (step ST78).

  On the other hand, when it is determined that UP running in step ST71 determines whether the car is stopped (step ST79). When the stop of the car is not detected, the process returns to step ST71, and when the stop of the car is detected, the output unit 4c shuts off one side of the circuit interrupting means 5 connected in parallel, for example, A and B here. Therefore, the previous cutoff value B is read (step ST710). Next, the interruption command OFF is switched to one side A of the circuit interruption means 5 and outputted (step ST711). After the output, the cutoff value A is written (step ST712). Next, it is determined whether or not a certain time has elapsed (step ST713). Wait when not reached a predetermined time, after a predetermined time has elapsed, it outputs the cutoff command off to one side B of the circuit breaker unit 5 (step ST714).

  According to the second embodiment, since the energization of the control circuit is not interrupted by closing the contacts on one side connected in parallel, welding monitoring can be performed without stopping the elevator service. Moreover, the welding of all the contacts can be monitored by switching the contacts to be blocked for each direction.

(Third embodiment)
FIG. 8 is a schematic configuration diagram illustrating a configuration of an elevator safety control device according to the third embodiment. As shown in FIG. 8, unlike the first and second embodiments, an elevator operation control device 8 that controls the operation of the elevator is provided, and the input unit 4 a of the door-opening travel prevention device 4 from the elevator operation control device 8. In addition, the cutoff command signal of the circuit cutoff means 5 is input.

  In the control device configured as described above, the elevator operation control device 8 gives a command signal to the input unit 4a of the door-opening travel prevention device 4, and the output unit 4c receives the command signal from the input unit 4a, thereby circuit breaking means. 5 outputs a shutoff command.

  Figure 9 is a flowchart showing a basic flow for performing contact welding detection An elevator control apparatus according to the third embodiment.

  The door-opening travel prevention device 4 determines whether or not there is a shut-off command signal from the elevator operation control device 8 (step ST91). When the cutoff command signal is received, the cutoff command is output to the circuit cutoff means 5 (step ST92). Then, the welding monitoring of the normally open contact 5a is performed (step ST93).

  According to the third embodiment, the shut-off command is sent from the elevator operation control device 8 that grasps the operation status of the elevator to the door-opening travel prevention device 4 that is independent of the elevator operation control, so that it matches the elevator operation status. It is possible to monitor the welding of the contacts by interrupting the circuit interrupting means 5 at an appropriate timing.

(Fourth embodiment)
FIG. 10 is a schematic configuration diagram illustrating a configuration of an elevator safety control device according to the fourth embodiment.

  As shown in FIG. 10, unlike the first to third embodiments, and a timer unit 4e to self internally counts the running with door open prevention device 4. The timer unit 4e starts counting with the input of the command signal from the elevator operation control device 8 as a trigger, and resets the count when the command signal is input again.

  In the control device configured as described above, when the elevator operation control device 8 gives a command signal to the input unit 4a of the door-opening travel prevention device 4, the time measuring unit 4e starts counting, and within a predetermined time period determined in advance. When the command signal is not input again, the output unit 4 c outputs a cutoff command to the circuit cutoff means 5. Predetermined time for example 24 hours, it is preferable that the maximum time that must perform a welding monitoring normally open contacts 5a.

  Figure 11 is a flowchart showing a basic flow for performing contact welding detection An elevator control apparatus according to the fourth embodiment. The door-open travel prevention device 4 determines whether or not there is a shut-off command signal from the elevator operation control device 8 (step ST111). Timer unit 4e in a state command signal is not from the elevator operation control device 8 determines the predetermined time interval has elapsed, for example 24 hours (step ST 112). No command signal, and the count value is counted up when not reached for 24 hours (step ST114), the flow returns to step ST111.

  When receiving the shut-off command signal, the timer unit 4e resets the count value (step ST113). In addition, when the state where there is no command signal from the elevator operation control device 8 exceeds a certain time, for example, 24 hours, that is, when the count value of the time measuring unit 4e exceeds 24 hours, the time measuring unit 4e sets the count value. Reset (step ST113).

  Next, after resetting the count value, a cutoff command is output to the circuit cutoff means 5 (step ST115). Then, the welding monitoring of the normally open contact 5a is performed (step ST116).

  According to the fourth embodiment, even when a failure occurs in the signal of the elevator operation control device or the input part of the door-opening travel prevention device, the circuit breaker is automatically shut off by the self-timer of the door-opening travel prevention device. The welding can be monitored.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 ... Electric motor 2 ... Braking device 3 ... Power converter 4 ... Door open travel prevention device 4a ... Input part 4b ... Monitoring part 4c ... Output part 4d ... Speed calculation part 4e ... Time measuring part 5 ... Circuit interruption means 5a ... Normally open contact 5b ... Normally closed contact 6 ... Speed governor 7 ... Encoder 8 ... Elevator operation control device

Claims (7)

An input unit that inputs signals necessary for elevator state monitoring from an elevator control circuit that controls the operation of the elevator, and a monitoring unit that determines an abnormal state of the elevator including door-opening traveling by an input signal from the input unit, Elevator operation control having a speed calculation unit that calculates the speed and moving direction of the car based on an input signal from the input unit, and an output unit that determines whether or not the elevator control circuit needs to be shut off based on the determination result of the monitoring unit A door-opening travel prevention device that independently monitors the door-opening travel,
A plurality of circuit shut-off means for shutting off the elevator control circuit according to a command of the output unit,
When the monitoring unit detects an elevator abnormality including door-opening traveling or when the speed calculation unit detects a stop of a car, the output unit outputs a blocking command to one of the plurality of circuit blocking means An elevator safety control device that outputs a shut-off command to another circuit shut-off means after a certain time and switches the circuit shut-off means that outputs the shut-off command first at the next shut-off from the previous one.   When the monitoring unit detects a normal state of the circuit breaking unit, the output unit outputs a closing command to one of the plurality of circuit blocking units, and outputs a closing command to the next circuit blocking unit after a certain period of time. 2. The elevator safety control device according to claim 1, wherein the circuit shut-off means for outputting the first order command at the next turn-on is switched from the previous one.   3. The elevator safety according to claim 1, wherein the predetermined time is set to a time within a range of a control delay from an abnormality detection to an elevator stop including an operation time of the circuit shut-off means. Control device.   The circuit interruption means has a normally open contact, the normally open contact of one of the circuit interruption means is connected in series to the elevator control circuit, and the normally open contact of another circuit interruption means is connected in parallel, 2. The elevator safety control device according to claim 1, wherein the output unit switches a cut-off command to the circuit cut-off means connected in parallel depending on a moving direction when the car stops. 3.   An elevator operation control device for controlling the operation of the elevator is provided, a command signal from the elevator operation control device is input to the input unit, and the output unit issues a shut-off command to the circuit shut-off means according to a signal state from the input unit. The elevator safety control device according to claim 4, wherein the elevator safety control device outputs the safety control device.   The door-opening travel prevention device includes a timer unit that starts counting with the input of a command signal from the elevator operation control device as a trigger, and resets the count when the command signal is input again. 6. The elevator safety control device according to claim 5, wherein when the signal is not input, the output unit outputs a cutoff command to the circuit cutoff means.   7. The elevator safety control device according to claim 6, wherein the predetermined time is set to 24 hours.

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