Elevator, control device for elevator, and control method for elevator

Abstract

The present application provides an elevator, an elevator control device, and an elevator control method, capable of improving safety when detecting reverse travel and braking the car during maintenance operation. In an elevator (1) having a car (2), a drive device that moves the car (2), and a control device (3) that controls movement of the car (2), the control device (3) brakes the car (2) when detecting reverse travel of the car (2) during maintenance operation, and changes sensitivity of detecting reverse travel of the car (2) according to a position of the car (2).

Description

Technical Field

[0001] This invention relates to elevators, elevator control devices, and elevator control methods. Background Technology

[0002] The situation where the elevator car descends while the elevator is ascending, or ascends while the elevator is descending, is called reverse travel.

[0003] Regarding technologies related to reverse travel during elevator startup, for example, in the abstract of Patent Document 1, the problem described is "providing an elevator anomaly detection device capable of detecting perceptible reverse impact during elevator startup," and the solution described is "provided with: a reverse travel detection unit 15 that compares the travel direction command signal and the actual travel direction signal of the elevator signal input unit 11 to detect reverse travel during startup; a travel speed calculation unit 12 that calculates the travel speed using the pulse signal of the rotary encoder during reverse travel; an acceleration calculation unit 13 that calculates the acceleration based on the travel speed; and a comparison determination unit 14 that compares the acceleration with a pre-stored anomaly determination value."

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2007-169002 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] However, although Patent Document 1 describes the detection of reverse travel in order to detect the reverse impact that can be felt when the elevator starts, and the calculation of acceleration during reverse travel, it does not consider maintenance operation.

[0009] The problem to be solved by the present invention is to provide an elevator, an elevator control device, and an elevator control method, which can improve the safety when detecting reverse travel and braking the car during maintenance and operation.

[0010] Technical means for solving technical problems

[0011] To solve the above problems, the elevator of the present invention is, for example, an elevator having a car, a drive device for moving the car, and a control device for controlling the movement of the car, characterized in that, when the control device detects that the car is traveling in reverse during maintenance operation, it brakes the car and changes the sensitivity of detecting the reverse travel of the car according to the position of the car.

[0012] Furthermore, the elevator control device of the present invention is, for example, an elevator control device for controlling the movement of an elevator car, characterized in that it includes: a reverse travel determination unit that detects reverse travel of the car during maintenance operation; and a maintenance travel command unit that controls the car to brake when the reverse travel determination unit detects reverse travel of the car during maintenance operation, wherein the reverse travel determination unit changes the sensitivity of detecting reverse travel of the car according to the position of the car.

[0013] Furthermore, the elevator control method of the present invention is, for example, a method for controlling the movement of an elevator car, characterized in that, when reverse travel of the car is detected during maintenance operation, the car is braked, and the sensitivity of detecting reverse travel of the car is changed according to the position of the car.

[0014] Invention Effects

[0015] According to the present invention, by varying the sensitivity of detecting reverse travel of the car according to the position of the car, the safety of detecting reverse travel and braking the car during maintenance operations can be improved. Attached Figure Description

[0016] Figure 1 This is a functional block diagram of the elevator in an embodiment.

[0017] Figure 2 This is a schematic diagram illustrating the elevator of the embodiment, the descent determination threshold, and the ascent determination threshold.

[0018] Figure 3 This is a flowchart illustrating an example of the control flow of an elevator in an embodiment. Detailed Implementation

[0019] Hereinafter, embodiments of the present invention will be described using the accompanying drawings. In the drawings, the same or similar constituent elements are labeled with the same reference numerals, and repeated descriptions are omitted.

[0020] Figure 1 This is a functional block diagram of the elevator in an embodiment.

[0021] The elevator 1 in Example 1 has a car 2 (in Figure 1 Not shown in the image, please refer to the diagram. Figure 2 ), a drive device for moving the car 2, and a control device 3 for controlling the movement of the car 2.

[0022] The drive unit that moves the car 2 includes an inverter 4 controlled by a control unit 3 and a traction machine 5 driven by the inverter 4. The car 2 is connected to the counterweight in a balanced manner by ropes, and the elevator 1 moves the car 2 by driving the ropes with the traction machine 5. The basic structure and basic operation of the elevator 1 are the same as those of a general elevator, so detailed descriptions are omitted.

[0023] Furthermore, the elevator 1 in this embodiment includes: a motor encoder 6, which functions as a sensor for detecting the position of the motor of the traction machine 5; a speed controller encoder 7, which functions as a sensor for detecting the position of the car 2; and a car-mounted maintenance terminal 8 and a pit-mounted maintenance terminal 9 used in maintenance operations. The motor encoder 6, speed controller encoder 7, car-mounted maintenance terminal 8, and pit-mounted maintenance terminal 9 are respectively connected to the control device 3. The car-mounted maintenance terminal 8 and the pit-mounted maintenance terminal 9 are examples of maintenance terminals; either one can be used, or they can be installed in other locations.

[0024] The control device 3 is a control device for the elevator 1 that controls the movement of the car 2 of the elevator 1. It includes a maintenance terminal operation detection unit 31, a maintenance travel command unit 32, a car position detection unit 33, a traction machine control unit 34, a travel direction determination unit 35, a travel distance calculation unit 36, and a reverse travel determination unit 37. The control device 3 may be, for example, a microcomputer with an input unit, an output unit, an arithmetic processing unit, and a memory, and each functional unit is implemented by the arithmetic processing unit executing programs, but it may also have other structures.

[0025] The control device 3 detects the operation instructions of the maintenance terminal 8 on the car and the maintenance terminal 9 in the pit via the maintenance terminal operation detection unit 31, and inputs the detection results of the operation instructions into the maintenance driving command unit 32, the travel distance calculation unit 36, and the reverse driving determination unit 37.

[0026] Based on the input from the speed controller encoder 7, the control device 3 detects the position of the car 2 through the car position detection unit 33 and inputs it to the travel distance calculation unit 36 ​​and the reverse travel determination unit 37.

[0027] Based on the input from the speed controller encoder 7, the control device 3 detects the direction of movement of the car 2 through the movement direction determination unit 35 and inputs it to the reverse driving determination unit 37.

[0028] In the travel distance calculation unit 36, the control device 3 calculates the distance traveled by the car 2 since the start of the operation of the maintenance terminal, based on the inputs from the maintenance terminal operation detection unit 31 and the car position detection unit 33. Reverse travel is prone to occur at the start of the operation to move the car 2 performed by the maintenance terminal; therefore, in this embodiment, the travel distance of the car 2 from that moment is calculated.

[0029] In the reverse travel determination unit 37, the control device 3 detects reverse travel of the car 2 during maintenance operation. Specifically, if the direction of operation indicated by the maintenance terminal is different from the actual direction of movement of the car 2, and the distance the car 2 moves exceeds a predetermined threshold, reverse travel is determined. Details of this determination will be explained later. The result of the reverse travel detection is input to the maintenance travel command unit 32.

[0030] In the maintenance travel command unit 32, during maintenance, the control device 3 controls the inverter 4 via the traction machine control unit 34 to move the car 2, causing the car 2 to move in the direction indicated by the operation based on the maintenance terminal. At this time, the traction machine control unit 34 also uses information from the motor encoder 6 for control. Furthermore, when the car 2 is stopped in the maintenance travel command unit 32, the control device 3 controls the inverter 4 via the traction machine control unit 34 to stop the car 2.

[0031] Furthermore, if the reverse travel determination unit 37 detects reverse travel during maintenance operation, the control device 3, through the traction machine control unit 34, controls the inverter 4 in the maintenance travel command unit 32 to brake the car 2. The control device 3 can also control the braking of the car 2 using a brake not shown.

[0032] Figure 2 This is a schematic diagram illustrating the elevator of the embodiment, the descent determination threshold, and the ascent determination threshold.

[0033] This shows a situation where workers 10 are working on top of the car 2 and in the pit during maintenance.

[0034] In the elevator 1 of this embodiment, when the control device 3 detects that the car 2 is traveling in reverse during maintenance operation, it brakes the car 2 and adjusts the sensitivity of detecting the reverse travel of the car 2 according to the position of the car 2. More specifically, the reverse travel determination unit 37 adjusts the sensitivity of detecting the reverse travel of the car 2 according to the position of the car 2.

[0035] For example, when the car 2 is in a low position, the head of the worker 10 in the pit may collide with the car 2, or the worker 10 may be trapped between the structure in the pit and the car 2. Therefore, when the car 2 is in a low position, in the event of reverse travel of the car 2, it is preferable to brake the car 2 with a shorter distance.

[0036] Therefore, the control device 3 is preferably configured such that, when determining reverse travel in an upward operation instruction if the car 2 has descended a distance exceeding the descent determination threshold, the descent determination threshold when the car 2 is at a lower position is smaller than the descent determination threshold when the car 2 is at a higher position, i.e., easier to detect. Figure 2The example shown illustrates how the descent determination threshold gradually decreases as the position of the car 2 decreases. However, it is not limited to this; for example, the change in the sensitivity of the descent determination threshold can be set in two stages, where the control device 3 uses a first descent determination threshold as the descent determination threshold when the position of the car 2 is below a first height, and uses a second descent determination threshold as the descent determination threshold when the position of the car 2 is above the first height, wherein the first descent determination threshold is configured to be smaller than the second descent determination threshold.

[0037] Similarly, when the car 2 is in a higher position, the head of the worker 10 on the car 2 may collide with the top of the shaft, or the worker 10 may be trapped between the safety fence on the car 2 and the top of the shaft. Therefore, when the car 2 is in a higher position, in the event of reverse travel of the car 2, it is preferable to brake the car 2 with a shorter distance.

[0038] Therefore, the control device 3 is preferably configured such that, when determining reverse travel in a descending operation instruction if the car 2 has risen a distance exceeding the rising determination threshold, the rising determination threshold when the car 2 is at a higher position is smaller than the rising determination threshold when the car 2 is at a lower position, i.e., it is easier to detect. Figure 2 The example shown illustrates how the ascent determination threshold gradually decreases as the position of the car 2 increases. However, it is not limited to this; for example, the change in the sensitivity of the ascent determination threshold can be set in two stages, where the control device 3 uses a first ascent determination threshold when the position of the car 2 is above the second height, and uses a second ascent determination threshold when the position of the car 2 is below the second height, with the first ascent determination threshold configured to be smaller than the second ascent determination threshold.

[0039] The method of changing the sensitivity of detecting the reverse travel of car 2 based on the position of car 2 is not limited to the above method. Various methods such as changing in three or more stages can be considered.

[0040] Figure 3 This is a flowchart illustrating an example of the control flow of an elevator in an embodiment.

[0041] Here is an example of a flowchart showing the sensitivity of detecting reverse driving in two stages, but it is not limited to this.

[0042] The maintenance terminal has a UP button for indicating an upward movement and a DN button for indicating a downward movement. Here, upward movement will be abbreviated as UP, and downward movement will be abbreviated as DN.

[0043] Figure 3 The flowchart shown is executed periodically in control device 3.

[0044] In step S1, it is determined whether only one of the UP or DN buttons on all maintenance terminals was pressed. If two or more buttons were pressed, or if none were pressed, the process proceeds to step S11, and the car 2 is stopped. If only one button was pressed, the process proceeds to step S2.

[0045] In step S2, it is determined whether the UP button of a maintenance terminal has been pressed. If the UP button has been pressed, proceed to step S3. If the UP button has not been pressed, since the DN button was pressed, proceed to step S7.

[0046] In step S3, the UP button is pressed. Therefore, it is determined whether the moving direction (actual moving direction) of the car 2 is DN. If it is not DN, since no reverse travel has occurred, the process proceeds to A and ends. If it is DN, since there is a possibility of reverse travel, the process proceeds to step S4.

[0047] In step S4, to select the sensitivity for detecting reverse travel, it is determined whether the position of car 2 is within 2m of the lowest reference plane. If it is, proceed to step S5. If it is not, proceed to step S6.

[0048] In step S5, since it is necessary to improve the sensitivity of detecting reverse travel, a first descent determination threshold, which is smaller than the second descent determination threshold, is used as the descent determination threshold to determine whether the travel distance of the car 2 is above the first descent determination threshold. If it is, since reverse travel has occurred, the process proceeds to step S11, where the car 2 is braked and stopped. If it is not, the process proceeds to step A and ends.

[0049] In step S6, it is determined whether the travel distance of the car 2 is above the second descent determination threshold. If it is, since a reverse travel situation has occurred, the process proceeds to step S11, where the car 2 is braked and stopped. If it is not, the process proceeds to step A and ends.

[0050] In step S7, the DN button is pressed. Therefore, it is determined whether the moving direction (actual moving direction) of the car 2 is UP. If it is not UP, since no reverse travel has occurred, the process proceeds to A and ends. If it is UP, since there is a possibility of reverse travel, the process proceeds to step S8.

[0051] In step S8, to select the sensitivity for detecting reverse travel, it is determined whether the position of car 2 is within 2m of the uppermost reference plane. If it is, proceed to step S9. If it is not, proceed to step S10.

[0052] In step S9, since it is necessary to improve the sensitivity of detecting reverse travel, a first rise determination threshold, which is smaller than the second rise determination threshold, is used as the rise determination threshold to determine whether the moving distance of the car 2 is above the first rise determination threshold. If it is, since reverse travel has occurred, the process proceeds to step S11, where the car 2 is braked and stopped. If it is not, the process proceeds to step A and ends.

[0053] In step S10, it is determined whether the travel distance of the car 2 is above the second ascent determination threshold. If it is, since a reverse travel situation has occurred, the process proceeds to step S11, where the car 2 is braked and stopped. If it is not, the process proceeds to step A and ends.

[0054] The embodiments of the present invention have been described above, but the present invention is not limited to the structures described in the embodiments, and various modifications can be made within the scope of the technical concept of the present invention. In addition, some or all of the structures described in the embodiments can also be combined for application.

[0055] Label Explanation

[0056] 1 elevator

[0057] 2-car

[0058] 3 Control devices

[0059] 4 inverters

[0060] 5 traction machines

[0061] 6 motor encoder

[0062] 7 Speed ​​Controller Encoder

[0063] 8. Maintenance terminal on car

[0064] 9. Maintenance terminal in the pit

[0065] 10 workers

[0066] 31 Maintenance Terminal Operation and Testing Department

[0067] 32 Maintenance and Driving Command Section

[0068] 33 Car Position Detection Department

[0069] 34 Traction Machine Control Department

[0070] 35. Movement Direction Determination Unit

[0071] 36. Movement Distance Calculation Unit

[0072] 37. Reverse driving determination unit.

Claims

1. An elevator comprising a car, a drive mechanism for moving the car, and a control mechanism for controlling the movement of the car, characterized in that, When the control device detects the car reversing during maintenance operation, it brakes the car and adjusts the sensitivity of detecting the reversing motion of the car according to the position of the car.

2. The elevator as described in claim 1, characterized in that, When the car descends a distance exceeding the descent determination threshold during an upward operation instruction, the control device determines that the car is reversing. The descent determination threshold when the car is at a lower position is lower than the descent determination threshold when the car is at a higher position.

3. The elevator as described in claim 2, characterized in that, The control device uses a first descent determination threshold as the descent determination threshold when the car position is below the first height, and uses a second descent determination threshold when the car position is above the first height, wherein the first descent determination threshold is less than the second descent determination threshold.

4. The elevator as described in claim 1, characterized in that, The control device determines that the car is reversing when the car rises a distance above the rising determination threshold in the descent operation instruction. The rising determination threshold when the car is at a higher position is lower than the rising determination threshold when the car is at a lower position.

5. The elevator as described in claim 4, characterized in that, The control device uses a first rising threshold as the rising threshold when the car position is above the second height, and uses a second rising threshold when the car position is below the second height, wherein the first rising threshold is less than the second rising threshold.

6. A control device for an elevator, wherein the control device controls the movement of the elevator car, the control device being characterized by having: A reverse travel determination unit that detects the reverse travel of the car during maintenance and operation; and The maintenance driving command unit, when the reverse driving determination unit detects reverse driving of the car during maintenance operation, controls the car to be braked. The reverse driving determination unit adjusts the sensitivity of detecting the reverse driving of the car according to the position of the car.

7. A control method for an elevator, wherein the elevator control method controls the movement of the elevator car, characterized in that, When reverse movement of the car is detected during maintenance operation, the car is braked, and the sensitivity of detecting reverse movement of the car is adjusted according to the position of the car.

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