JP2017178483A - Elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator with a highly accurate final limit switch.SOLUTION: When a position detection sensor 80 detects a first detected object 83 while a car 12 descends in a hoistway 11, an elevator outputs a signal to turn on a final limit switch 60 to block a power supply to a drive part 105 of the car 12. Then, when the position detection sensor 80 detects a second detected object 82 while the car 12 ascends in the hoistway 11, the elevator outputs a signal to turn off the final limit switch 60.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an elevator equipped with a final limit switch.

  Conventionally, elevators have been provided with various safety devices in order to ensure safe operation of the car. As one of the safety devices, a final limit switch is known that makes an emergency stop of the car when the elevator car is lowered (overly lowered) below the lowest floor.

  As a configuration of the final limit switch, a combination of a rod-shaped limit cam extending in the moving direction of the elevator and a roller-shaped slider is known (Patent Document 1). As another final limit switch configuration, a combination of a shielding plate extending from the door sill on the lowest floor to a buffer at the bottom of the hoistway and a position detection sensor attached to the car is known. (Patent Document 2).

JP-A-57-23577 JP 2012-66881 A

  However, in the configuration of the final limit switch disclosed in the above document, it is necessary to lengthen the limit cam and the shielding plate in order to keep the final limit switch in the on state. For this reason, the attached shielding board etc. incline, the detection by a position detection sensor cannot be performed correctly, and the problem that the precision of a final limit switch falls arises.

  Further, in the case of an elevator that moves up and down the hoistway at high speed, it is necessary to increase the distance between the buffer and the door sill on the lowest floor, so that the shielding plate is inevitably longer and the shielding plate is more easily inclined. Moreover, the problem that the operation | work which attaches a shielding board and the operation | work which confirms the inclination of a shielding board takes time also arises.

  In view of the above problems, an object of the present invention is to provide an elevator including a highly accurate final limit switch in which the size of a shielding plate is suppressed.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. For example, a car that moves up and down the hoistway, a control unit that controls the car, and a hoistway attached to the car A position detection sensor for detecting the position of the car in the vehicle, a first detected body provided in a hoistway detected by the position detection sensor, and a first detected body in the hoistway than the first detected body A second object to be detected that is detected by a position detection sensor provided at a high position, and a final limit switch that detects an overshoot of the car on the lowest floor and stops the car. When the position detection sensor detects the first object to be detected when the car descends in the hoistway, it outputs a signal for turning on the final limit switch to the car drive unit. When the position detection sensor detects the second object to be detected when the car is raised in the hoistway after the power supply is cut off, a signal for turning off the final limit switch is output. .

  According to the elevator of this invention, the dimension of the to-be-detected body which comprises a final limit switch can be suppressed, and the precision of a final limit switch can be improved.

1 is an overall configuration diagram of an elevator according to an embodiment of the present invention. It is a block diagram which shows the structure of the control part of the elevator concerning the embodiment of this invention. It is the top view and perspective view of a position detection sensor which are mounted on a car according to an embodiment of the present invention. It is a perspective view of the shielding board which is a to-be-detected body concerning the embodiment of this invention. It is a figure which shows the output pattern of the position detection sensor concerning the embodiment of this invention. It is an operation | movement flowchart of the elevator concerning the embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the common member in each figure.

First, the configuration of an elevator according to an embodiment of the present invention (hereinafter referred to as “this example”) will be described with reference to FIG.
FIG. 1 is an overall configuration diagram of an elevator including a final limit switch according to the present example.

  As shown in FIG. 1, the elevator 1 includes a car 12 that moves up and down in a hoistway 11 formed in a building structure, a rope 13, and a counterweight 14. A machine room 16 is provided at the top of the hoistway 11, and the hoisting machine 10 and the control panel 18 are installed in the machine room 16.

  The building structure is provided with elevator halls 50 and 51 each having a hall door 109 for each floor. A floor 115 and a landing threshold 102 are formed in the elevator hall 50 on the intermediate floor, and a floor 115 and a landing threshold 101 are formed in the elevator landing on the lowest floor.

  A motor 105 for rotating the hoisting machine 10 is connected to the hoisting machine 10, and the motor 105 is driven by power supplied from a power source (not shown). The car 12 moves up and down in the hoistway 11 by moving the rope 13 connected to the counterweight 14 by the hoisting machine 10 driven by the motor 105.

  A control unit 20 that controls the operation of the elevator 1 is provided inside the control panel 18, and the control unit 20 controls the electric power supplied to the motor 105 according to, for example, a hall call. Thereby, the driving force of the motor 105 that drives the hoisting machine 10 is controlled to control the up-and-down movement of the car 12 in the hoistway 11. In addition, the control unit 20 performs control to open and close the door by synchronizing the landing side door 109 and the car side door 110.

  A pit 103 is formed at the bottom of the hoistway 11, and a buffer 104 serving as a buffer is installed in the pit 103. The shock absorber 104 receives the car 12 and shocks the passengers in the car 12 when the car 12 passes down the elevator landing 51 on the lowermost floor for any reason and an overfall occurs. ease.

  Further, a final limit switch 60 is provided near the lower part of the lowermost floor 51 of the hoistway 11. The final limit switch 60 is a switch for urgently stopping the car 12 when it is turned on when the car 12 exceeds a specified operation range (in the case of excessive descent in this example). Although the final limit switch 60 is always in an off state, the final limit switch 60 is turned on when the car 12 is excessively lowered, and sends a FLS (final limit switch) set signal to the control unit 20.

To each of the landing thresholds 101 and 102, detected bodies 81 to 83 each having a shielding plate having a different shape are attached.
A detection object 81 for detecting a stop floor is attached to the landing threshold 102 of the elevator hall 50 on the intermediate floor. Further, a detection object 82 for detecting a stop floor and a detection object 83 for a final limit switch are attached to the landing threshold 101 of the elevator hall 51 on the lowest floor. The final limit switch detection body 83 is provided in the hoistway 11 so as to be positioned below the detected body 82.

  A position detection sensor 80 that detects the detected objects 81 to 83 is mounted on the bottom of the car 12. When the car 12 arrives at the destination floor, the position detection sensor 80 changes the output by the detected bodies 81 and 82 installed on the landing thresholds 101 and 102 of the destination floor to correspond to the stop position. A stop position signal is sent to the control unit 20. Receiving the stop position signal, the control unit 20 controls the driving force of the motor 105 to stop the car 12 on the target floor and open / close the landing side door 109 and the car side door 110. In addition to the optical type, the position detection sensor 80 may be a non-contact type detection sensor such as a photoelectric type, a magnetic type (magnet use, high frequency magnetic field use, etc.), a capacitance type, or the like.

  Further, when the car 12 is excessively lowered, the position detection sensor 80 changes the output by the detected object 83 for the final limit switch, and outputs an FLS set signal corresponding to the excessively lowering of the car 12. It is sent to the control unit 20. Upon receiving the FLS set signal, the control unit 20 cuts off the supply of power to the motor 105, loses the driving force of the motor 105, controls the rotation of the hoisting machine 10, and urgently stops the car 12. Let

FIG. 2 is a block diagram illustrating a configuration of the control unit 20 of the elevator 1 according to the present example.
As shown in FIG. 2, the control unit 20 includes an arithmetic device 19 and a storage unit 21 inside.
The arithmetic unit 19 is composed of a microcomputer that performs a logical operation, and receives a stop position signal, an FLS set signal, and an FLS reset signal. The arithmetic unit 19 detects the state of the car 12 by the calculation, sends a power supply on / off signal to control the power supply to the power source that drives the motor 105, and the car 12 in the hoistway 11. Controls the up and down movement. The storage unit 21 is composed of a nonvolatile memory, and temporarily stores the FLS set signal input to the control unit 20.

  FIG. 3 is a plan view and a perspective view of the position detection sensor 80 mounted on the car 12. 3A is a plan view of the position detection sensor 80 mounted on the car 12, and FIG. 3B is a perspective view of the position detection sensor 80. FIG.

  As shown in FIG. 3A, the position detection sensor 80 has a configuration in which three sensor units 80 </ b> A to 80 </ b> C are arranged in parallel to detect detected bodies 81 to 83 described in detail below. Here, an example using a photoelectric sensor including a light emitting unit 801 and a light receiving unit 802 is shown, and three uniaxial photoelectric sensors are arranged in parallel under the car 12. Reference numerals 80a to 80c in the figure denote the light beams of the respective photoelectric sensors. Further, the sensor units 80A to 80C are units having the same concave shape as shown in FIG. 3B, and are arranged in a line with the side surfaces matched.

FIG. 4 is a perspective view showing the detected bodies 81 to 83 arranged in the landing thresholds 101 and 102.
FIG. 4A is a perspective view of a detection object 81 for detecting a stop floor attached to the landing threshold 102 of the elevator landing 50 on the intermediate floor, and FIG. 4B is attached to the landing threshold 101 of the elevator landing 51 on the lowest floor. FIG. 4C is a perspective view of a detection target 83 for a final limit switch attached below the detection target 82. FIG.

  As shown in FIG. 4A, the detected object 81 includes a flat plate-shaped attachment part 81d for attaching the detected object 81 to the landing sill 102, and two pieces attached to the attachment part 81d at a predetermined interval. Shielding plates 81a and 81c are provided. The shielding plates 81a and 81c correspond to the sensor units 80A and 80C of the position detection sensor 80, respectively. The light beam from the light emitting unit 801 of the sensor unit 80A to the light receiving unit 802 is blocked by the shielding plate 81a, and the light beam from the light emitting unit 801 to the light receiving unit 802 of the sensor unit 80C is blocked by the shielding plate 81c.

  As shown in FIG. 4B, the detection target 82 as the second detection target is provided with a flat plate-like attachment portion 82d for attaching the detection subject 82 to the landing sill 101, with a predetermined interval. Two shielding plates 82b and 82c attached to 82d. The shielding plates 82b and 81c correspond to the sensor units 80B and 80C of the position detection sensor 80, respectively. The light beam from the light emitting unit 801 of the sensor unit 80B to the light receiving unit 802 is blocked by the shielding plate 82b, and the light beam from the light emitting unit 801 to the light receiving unit 802 of the sensor unit 80C is blocked by the shielding plate 82c.

  As shown in FIG. 4C, the detection target 83, which is the first detection target, is mounted at a predetermined interval from a flat plate-like mounting portion 83d for mounting the detection target 83 in the hoistway 11. And three shielding plates 83a, 83b, 83c attached to the portion 83d. The shielding plates 83a, 83b, and 83c correspond to the sensor units 80A, 80B, and 80C of the position detection sensor 80, respectively. The light beam from the light emitting portion 801 of the sensor unit 80A to the light receiving portion 802 is blocked by the shielding plate 83a, the light beam from the light emitting portion 801 to the light receiving portion 802 of the sensor unit 80B is blocked by the shielding plate 83b, and the light shielding plate 83c. The light beam from the light emitting unit 801 of the sensor unit 80C to the light receiving unit 802 is blocked.

The vertical lengths of the shielding plates 81a and 81c of the detected body 81 and the shielding plates 82b and 82c of the detected body 82 coincide with the lengths of the stop zones corresponding to the stop positions of the elevator landings 50 and 51, respectively. It is formed to do. The vertical lengths of the shielding plates 83a, 83b, and 83c of the detection target 83 for the final limit switch are formed so as to coincide with the length of the FLS set zone that turns on the final limit switch 60.

According to this example, it is only necessary to detect that the position detection sensor 80 of the car 12 that has descended the hoistway 11 due to excessive descent has entered the FLS set zone in which the final limit switch 60 is turned on. The vertical lengths of the shielding plates 83 a, 83 b, 83 c of the detected object 83 need not match the distance from the elevator landing 51 on the lowest floor to the shock absorber 104. Accordingly, since it is not necessary to lengthen the detection target 83, the possibility that the shielding plates 83a, 83b, 83c are inclined is reduced, and the accuracy of the final limit switch 60 can be improved.

  Further, the detected bodies 81 to 83 of this example are made of a material such as plastic that can block the light beam from the light emitting unit 801 to the light receiving unit 802 of the sensor unit 80, but the detected bodies 81 to 83 are the same. The production cost can be suppressed by using the material.

  FIG. 5 is a diagram showing detection patterns of the position detection sensor 80 and the detected bodies 81 to 83 according to this example. That is, FIG. 5 is a diagram illustrating a combination pattern of detection by the position detection sensor 80. The pattern for identifying the stop zone on the intermediate floor, the pattern for identifying the stop zone on the lowest floor, and the final limit switch in the on state. The pattern for identifying the FLS set zone to be set is shown.

  The vertical axis of the chart indicates the location where the position detection sensor 80 detects the detection target, and the horizontal axis indicates the detection results of the sensor units 80A to 80C of the position detection sensor 80. POS1 indicates the detection result of the sensor unit 80A, POS2 indicates the detection result of the sensor unit 80B, and POS3 indicates the detection result of the sensor unit 80C. Further, 0 in the chart indicates a state in which each sensor unit does not detect the shielding plate of the detected object, and 1 indicates a state in which each sensor unit detects the shielding plate of the detected object.

  When the car 12 is in the stop zone of the elevator hall 50 on the intermediate floor, the sensor units 80A and 80C of the position detection sensor 80 are shield plates for the detected object 81 attached to the landing threshold 102 of the elevator hall 50 on the intermediate floor. Since the light is shielded by 81a and 81c, the detection pattern of the position detection sensor 80 is “1, 0, 1” as shown in the upper part of FIG.

  When the car 12 is in the stop zone of the elevator floor 51 on the lowermost floor, the sensor units 80B and 80C of the position detection sensor 80 of the detected object 82 attached to the landing threshold 101 of the elevator floor 51 on the lowermost floor. Since the light is shielded by the shielding plates 81b and 81c, the detection pattern of the position detection sensor 80 is “0, 1, 1” as shown in the middle of FIG.

  When the car 12 is in the FLS set zone where the final limit switch 60 is turned on, the sensor units 80A to 80C of the position detection sensor 80 are shielded by the shield plates 83a to 83c of the detected object 83 attached inside the hoistway 11. Therefore, as shown in the lower part of FIG. 5, the detection pattern of the position detection sensor 80 is “1, 1, 1”.

  When the position detection sensor 80 detects the detection pattern “1, 0, 1”, the position detection sensor 80 sends an intermediate floor stop position signal to the control unit 20. The controller 20 recognizes that the car 12 is in the stop zone of the elevator floor 50 on the intermediate floor by receiving the stop position signal on the intermediate floor, and stops the car 12 at the elevator hall 50 on the intermediate floor. Then, the car side door 110 and the hall side door 109 on the intermediate floor are opened and closed.

  When the position detection sensor 80 detects the detection pattern “0, 1, 1”, the position detection sensor 80 sends a stop position signal of the lowest floor to the control unit 20. The control unit 20 recognizes that the car 12 is in the stop zone of the elevator floor 51 on the lowermost floor by receiving the stop position signal of the lowermost floor, and moves the car 12 to the elevator hall 51 on the lowermost floor. At the same time, the car-side door 110 and the lowermost hall-side door 109 are opened and closed.

  When the position detection sensor 80 detects the detection pattern “1, 1, 1”, the position detection sensor 80 sends an FLS set signal to the control unit 20. By receiving the FLS set signal, the controller 20 recognizes that the car 12 is below the stop zone of the elevator floor 51 on the lowest floor, and recognizes that an excessive descent has occurred for some reason. Upon receiving the FLS set signal, the control unit 20 outputs a power supply off signal, cuts off the supply of power to the motor 105, and urgently stops the car 12. In order to identify that the excessive decrease has occurred, the transition from the detection pattern “0, 1, 1” to the detection pattern “1, 1, 1” may be added to the identification condition.

  Further, the detected object 82 of this example has an identification function for resetting the final limit switch 60 in addition to the function of identifying that the car 12 is present in the stop zone of the elevator hall 51 on the lowest floor. Doubles as

  That is, when the cause of the excessive descent is eliminated by the recovery work, it is necessary to return the final limit switch 60 from the on state to the off state. In addition, when the cause of the excessive lowering is eliminated, it is necessary to raise the car 12 in the hoistway 11 that has been lowered due to the excessive lowering and return the elevator 1 to the normal operation state.

  When performing the operation of returning the elevator 1 in which the cause of the excessive descent has been eliminated to the normal operation state, the car 12 that has been in the excessively lowered position is raised, but in this example, The light beam from the light emitting unit 801 to the light receiving unit 802 of the sensor unit 80B is blocked by the shielding plate 82b, and the light beam from the light emitting unit 801 to the light receiving unit 802 of the sensor unit 80C is blocked by the shielding plate 82c. As a result, the position detection sensor 80 detects the detection pattern “0, 1, 1” shown in the middle part of FIG.

  When the position detection sensor 80 detects the detection pattern “0, 1, 1”, the position detection sensor 80 sends an FLS reset signal to the control unit 20. The control unit 20 recognizes that the cause of the overfall has been eliminated by receiving the FLS reset signal. The control unit 20 that has received the FLS reset signal outputs a power supply ON signal, restarts the supply of power to the motor 105, and turns the final limit switch 60 to the OFF state. In order to identify that the cause of the excessive lowering has been resolved and the final limit switch 60 is turned off, the fact that the detection pattern “1, 1, 1” has transitioned to the detection pattern “0, 1, 1” is used. It may be added to the identification condition.

  Thus, in this example, in addition to the function of identifying that the detected object 82 as the second detected object exists in the stop zone of the elevator floor 51 on the lowest floor, Since the final limit switch 60 has a function of resetting, it is not necessary to provide a special member for resetting the final limit switch 60. Further, even when a so-called on-failure in which the FLS set signal continues to be transmitted occurs, when the final limit switch 60 is reset, the FLS reset signal which is another signal is used. When reset, it can be recognized that an on-failure has occurred.

Next, operation | movement of the elevator 1 of this invention including operation | movement of the final limit switch 60 is demonstrated using a flowchart.
FIG. 6 is an operation flowchart of the elevator 1 according to this example.

  As shown in FIG. 6, when any abnormality occurs in the elevator 1 (step S <b> 1), the sensor units 80 </ b> A to 80 </ b> C of the position detection sensor 80 of the car 12 are shield plates of the detection target 83 for the final limit switch. It is detected whether or not the light is shielded by 83a to 83c. When the abnormality generated in the elevator 1 is excessively lowered and the sensor units 80A to 80C are shielded from light by the shielding plates 83a to 83c of the detection target 83 for the final limit switch (the detection pattern is “1” shown in FIG. , 1, 1 ”), the position detection sensor 80 sends an FLS set signal to the control unit 20 (YES in step S2). On the other hand, when the abnormality that has occurred in the elevator 1 is something other than an excessive descent, the sensor units 80A to 80C of the position detection sensor 80 are shielded from light by the shielding plates 83a to 83c of the detection target 83 for the final limit switch. The detection of whether or not is continued (NO in step S2).

  In step S2, the control unit 20 that has received the FLS set signal sent from the position detection sensor 80 sends a power supply off signal to the power supply, cuts off the supply of power to the motor 105, and makes the car 12 emergency. Stop. At the same time, the control unit 20 stores the received FLS set signal in the storage unit 21 and maintains a state where the power supply to the power source is cut off (step S3). This prohibits the final limit switch 60 from being reset by automatic operation.

  Next, in a state where the power supply to the power source is interrupted (a state where the final limit switch 60 is turned on), a recovery operation is performed to remove the cause of the excessive lowering (step S4).

Next, it is detected whether or not the position detection sensor 80 is shielded by the shielding plates 82b and 82c of the detection target 82 for detecting the lowest floor (step S6).
When the sensor units 80B and 80C of the position detection sensor 80 are shielded by the shielding plates 82b and 82c of the detection target 82 (when the detection pattern becomes “0, 1, 1” shown in FIG. 5), The position detection sensor 80 sends an FLS reset signal to the control unit 20 assuming that the restoration work has been completed (YES in step S5). On the other hand, when the sensor units 80B and 80C of the position detection sensor 80 are not shielded from light (when the detection pattern is not “0, 1, 1” shown in FIG. 5), the detection target 82 for detecting the lowest floor is continued. It is detected whether or not the sensor units 80B and 80C of the position detection sensor 80 are shielded by the shielding plates 82b and 82c (NO in step S5).

  In step S5, the control unit 20 that has received the FLS reset signal sent from the position detection sensor 80 sends a power supply ON signal to the power source, sets the motor 105 to the drive state, and returns the elevator 1 to the normal operation state. (Step S6).

  In this example, after the power supply off signal is sent by the FLS set signal and the power supply to the power supply is cut off, the power supply on signal is sent by the FLS reset signal and the final limit switch 60 is reset. Until that time, the state where the power supply to the power source is cut off is maintained by the FLS set signal stored in the storage unit 21 of the control unit 20.

  The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the spirit of the invention described in the claims. For example, in this example, as the configuration of the final limit switch 60, a detection object having a shielding plate that shields between the light emitting unit and the light receiving unit of the position detection sensor is used, but the beam emitted from the position detection sensor It is also possible to use a detection object provided with a reflector that reflects the light.

DESCRIPTION OF SYMBOLS 1 ... Elevator, 10 ... Hoisting machine, 11 ... Hoistway, 12 ... Ride car, 13 ... Rope, 14 ... Counterweight, 16 ... Machine room, 20 ... Control unit, 21 ... Storage unit, 50, 51 ... Elevator landing, 60 ... Final limit switch, 80 ... Position detection sensor, 81, 82, 83 ... Detected object, 101, 102 ... landing threshold, 103 ... pit, 104 ... shock absorber, 105 ... motor, 109 ... landing side door, 110 ... car side door

Claims (4)

A car that goes up and down the hoistway,
A control unit for controlling the car;
A position detection sensor attached to the car for detecting the position of the car in the hoistway;
A first object to be detected provided in the hoistway detected by the position detection sensor;
A second object to be detected by the position detection sensor provided at a position higher than the first object to be detected in the hoistway;
A final limit switch for detecting the overtravel of the car on the lowest floor and stopping the car,
When the position detection sensor detects the first object to be detected when the car descends in the hoistway, it outputs a signal for turning on the final limit switch, and the car When the position detection sensor detects the second object to be detected when the car is raised in the hoistway after the power supply to the driving unit is cut off, the final limit switch Elevator that outputs a signal to turn off. The elevator according to claim 1, wherein the control unit includes a storage unit that stores a signal for turning on the final limit switch. The controller is
The door provided in the said car is opened and closed when the said position detection sensor detects a said 2nd to-be-detected object, when the said car descends the inside of a hoistway. Elevator. The elevator according to any one of claims 1 to 3, wherein the first object to be detected and the second object to be detected are flat members and are made of the same material.

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