Elevator operation device during power outages

Abstract

To provide an operational device of an elevator in power failure capable of identifying a light-load direction of a car in a simple manner and at a low cost without requiring an added later work of a weight sensor and capable of determining an operational direction of the car.SOLUTION: An operational device of an elevator in power failure comprises: parameter calculation means to calculate various parameters including the braking distance of a car, the speed just before decelerating start, a travel direction, and a stop position based on the measured change measured by a distance sensor installed on a car top part during the time since the start of deceleration of the car until the stop of the car due to the power failure; a storage part to store elevator specific information including a rated loading capacity of the car, car mass, counterweight mass, roping, main cable mass, balance chain mass, and a going up / down travel; light-load direction determining means to determine the light-load direction of the car based on the calculated various parameters and the elevator specification information stored in the storage part; operational direction determining means to determine the operational direction of the car based on the determined light-load direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a power failure operation device that controls the operation of an elevator during a power failure. [Background technology]

[0002] Conventionally, elevator systems are known that, when an elevator car stops between floors due to a power outage or the like, use an emergency power source to move the car to a nearby floor, thereby preventing passengers from being trapped inside. Patent Document 1 discloses that the weight of the load loaded in the car is measured by a load sensor installed under the floor of the car, and the direction of the lighter load is determined based on the measured weight, and the car is moved in the lighter load direction, thereby reducing power consumption from the emergency power source. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2-138084 Summary of the Invention [Problem to be solved by the invention]

[0004] However, some existing elevators are old and only equipped with simple load sensors that can determine whether the elevator is full or not, and do not have load sensors that can measure the weight of the load with high enough resolution to determine the direction of the light load. If a high-resolution weight sensor is to be retrofitted under the floor of such an existing elevator, the retrofitting work will be time-consuming and costly.

[0005] Therefore, the object of the present disclosure is to provide a power outage operation device that can easily and inexpensively identify the light load direction without requiring retrofitting of a weight sensor, and that can control elevator operation during a power outage using information on the identified light load direction. [Means for solving the problem]

[0006] The power outage operation device according to the present disclosure is a power outage operation device that controls the operation of an elevator equipped with a distance sensor on the top or bottom of the car during a power outage, and is equipped with: a parameter calculation means that calculates various parameters including the braking distance of the car, the speed just before deceleration begins, the running direction, and the stopping position based on changes in measurements taken by the distance sensor while the car decelerates and stops due to the power outage; a memory unit that stores elevator specification information including the rated load capacity of the car, the mass of the car, the mass of the counterweight, the roping, the mass of the main rope, the mass of the counterchain, and the ascent and descent stroke; a light load direction determination means that determines the light load direction, which is the operating direction in which regenerative power is generated by the car, based on the various parameters calculated by the parameter calculation means and the elevator specification information stored in the memory unit; and an operating direction determination means that determines the operating direction of the car based on the determined light load direction. [Effects of the Invention]

[0007] According to the power outage operation device disclosed herein, the light load direction can be identified easily and at low cost without requiring retrofitting of a weight sensor, and the information on the identified light load direction can be used to control the operation of the elevator during a power outage. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing a schematic configuration of an elevator to which a power failure operation device according to a first embodiment is applied. [Figure 2] 1 is a block diagram showing the configuration of a control system of an elevator to which a power failure operation device according to a first embodiment is applied. [Figure 3] FIG. 10 is a diagram showing an example of elevator specification information stored in a storage unit (part 1). [Figure 4] FIG. 10 is a diagram showing a state in which a car has stopped between floors due to a power outage. [Figure 5] 10 is a flowchart showing an example of the flow of processing performed by a power outage operation device. [Figure 6]FIG. 10 is a diagram showing an example of elevator specification information stored in a storage unit (part 2). [Figure 7] FIG. 10 is a diagram showing an example of elevator specification information stored in a storage unit (part 3). DETAILED DESCRIPTION OF THE INVENTION

[0009] [First embodiment] The elevator power failure operation device 20 according to the first embodiment will be described below. Fig. 1 is a diagram showing a schematic configuration of an elevator 100 to which the power failure operation device according to the first embodiment is applied. Fig. 2 is a block diagram showing the configuration of a control system of the elevator 100 to which the power failure operation device according to the first embodiment is applied.

[0010] As shown in FIGS. 1 and 2, an elevator 100 is provided with a car 1 that moves up and down in a hoistway 7, a counterweight 2, and a hoist 6 that raises and lowers the car 1 and the counterweight 2 via a rope 5. A distance sensor S1 that measures the distance to the top of the hoistway 7 is provided on the top of the car 1. The elevator 100 is also provided with a normal operation device 10 and a power outage operation device 20. The normal operation device 10 controls the operation of the elevator during a power outage and includes a normal operation control unit 12 and a power outage detection unit 11. The normal operation control unit 12 controls the hoist 6 using power from a commercial power source. The power outage detection unit 11 monitors the supply status of power from the commercial power source, and outputs a power outage detection signal to the power outage operation device 20 when it detects that a failure has occurred in the power supply from the commercial power source.

[0011] The power outage operation device 20 controls the operation of the elevator during a power outage, and includes a parameter calculation unit 21, a memory unit 23, a light load direction determination unit 24, an operation direction determination unit 25, and a power outage operation control unit 26. When a power outage occurs, as shown in Fig. 1, the car 1 in operation is temporarily decelerated and stopped by an automatic braking system. Then, the power outage operation device 20 uses power from a backup power source (battery, generator, etc.) to control the hoisting machine 6 via the normal operation control unit 12, thereby moving the car 1 upward or downward to the nearest floor.

[0012] The parameter calculation unit 21 calculates various parameters including the braking distance Ls of the car 1, the speed Vmax immediately before the start of deceleration, the running direction dir, and the stop position x, based on changes in the measurement values ​​measured by the distance sensor S1 while the car 1 decelerates and stops due to the power outage. Specifically, the parameter calculation unit 21 first identifies the time when the car 1 starts to decelerate and the time when it stops, based on changes in the measurement values ​​measured by the distance sensor S1. Then, the parameter calculation unit 21 calculates the difference between the measurement value 1 measured by the distance sensor S1 at the time when the car 1 starts to decelerate and the measurement value 2 measured by the distance sensor S1 at the time when the car 1 stops, and sets this difference as the braking distance Ls. The parameter calculation unit 21 also calculates the change in distance per unit time immediately before the car 1 starts to decelerate, i.e., the value obtained by differentiating the measurement value measured by the distance sensor S1, and sets this difference as the speed Vmax immediately before the start of deceleration.

[0013] Furthermore, parameter calculation unit 21 determines the traveling direction of car 1 during deceleration based on an increase or decrease in the measurement value measured by distance sensor S1, and calculates a traveling direction dir having a value of 1 if the direction is an upward direction and -1 if the direction is a downward direction. Furthermore, parameter calculation unit 21 calculates the vertical position of car 1 in hoistway 7, i.e., stop position x, based on the measurement value measured by distance sensor S1 when car 1 is stopped.

[0014] The memory unit 23 stores various information related to operation during a power outage, such as elevator specification information that affects the braking distance of the car 1. As shown in Fig. 3, the memory unit 23 stores elevator specification information 231, such as the rated load capacity Rc of the car, the weight Wcar of the car, the mass Wcwt of the counterweight, the roping Rpg, the mass w1 of the main rope, the mass w2 of the counterchain, and the ascending / descending stroke TR.

[0015] The light load direction determination unit 24 determines the light load direction, which is the operating direction in which regenerative power of the car 1 is generated, based on the various parameters calculated by the parameter calculation unit 21 and the elevator specification information 231 stored in the storage unit 23. Specifically, the light load direction determination unit 24 calculates the car load factor β by calculation processing using the following equations (1) to (6), and determines the light load direction to be the upward direction if the calculated car load factor β is less than 50%, and determines the light load direction to be the downward direction if the car load factor β is 50% or more.

[0016] The light load direction determination unit 24 first calculates the deceleration α bks (m / s 2 In equation (1), the values ​​calculated by the parameter calculation unit 21 are substituted for the speed Vmax (m / min) immediately before the start of deceleration and the braking distance Ls (mm).

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[0023] Specifically, as shown in Fig. 4, when car 1 stops between floor F1, which is the nearest upper floor, and floor F2, which is the nearest lower floor, the operation direction determination unit 25 calculates a first travel distance D21 when car 1 travels to floor F1 and a second travel distance D22 when car 1 travels to floor F2. Then, the operation direction determination unit 25 compares a first evaluation value obtained by multiplying the first distance D21 by the car load factor β with a second evaluation value obtained by multiplying the second distance D22 by a value obtained by subtracting the car load factor β from 100%, and determines the upward direction as the operation direction of car 1 if the first evaluation value is less than the second evaluation value, or determines the downward direction as the operation direction of car 1 if the first evaluation value is greater than the second evaluation value. If the first evaluation value = the first evaluation value, the operation direction of car 1 is determined to be any predetermined direction, either up or down.

[0024] For example, if the load factor β in the car is 40%, the first distance D21 to the nearest floor above is 2 m, and the second distance D22 to the nearest floor below is 1 m, then the first evaluation value (= 0.8 m) is greater than the second evaluation value (= 0.6 m), and therefore the operating direction determination unit 25 can determine the downward direction as the operating direction of car 1.

[0025] The power failure operation control unit 26 controls the hoisting machine 6 using power from the backup power supply to move the car 1 upward or downward to the nearest floor. At this time, the power failure operation control unit 26 operates the car 1 in the operating direction (upward or downward) of the car 1 determined by the operating direction determination unit 25, and lands the car 1 on the nearest floor in that direction.

[0026] Here, an example of the flow of processing performed by the power failure operation device 20 will be described with reference to the flowchart shown in Fig. 5. When a power failure occurs, the car 1 in operation is temporarily decelerated and stopped by an automatic braking system. In addition, the power failure detection unit 11 outputs a power failure detection signal to the power failure operation device 20. Then, the power failure operation device 20 receives the power failure detection signal from the power failure detection unit 11 and performs a series of processing described below.

[0027] First, the parameter calculation unit 21 calculates various parameters including the braking distance Ls of the car 1, the speed Vmax immediately before the start of deceleration, the running direction dir, and the stop position x based on changes in the measured values ​​measured by the distance sensor S1 while the car 1 decelerates and stops due to a power outage (step ST1). Next, the light load direction determination unit 24 calculates the car load factor β by calculation processing using the various parameters calculated in step ST1 and the elevator specification information 231 stored in the storage unit 23 according to the above formulas (1) to (6) (step ST2).

[0028] Next, the light-load direction determination unit 24 determines whether the car load factor β calculated in step ST2 is 50% or more (step ST3). If the car load factor β is 50% or more (step ST3, YES), the light-load direction determination unit 24 determines the descent direction as the light-load direction, and the operation direction determination unit 25 determines the determined light-load direction (descent direction) as the operation direction of car 1 (step ST4). On the other hand, if the car load factor β is less than 50% (step ST3, NO), the light-load direction determination unit 24 determines the ascent direction as the light-load direction, and the operation direction determination unit 25 determines the determined light-load direction (ascent direction) as the operation direction of car 1 (step ST5). Next, the power outage operation control unit 26 operates car 1 in the operation direction (ascent or descent direction) of car 1 determined in step ST4 or step ST5, and lands car 1 at the nearest floor in that direction (step ST6).

[0029] As described above, in the power outage operation device 20, the parameter calculation unit 21 calculates various parameters, including the braking distance Ls of the car 1, the speed Vmax immediately before deceleration begins, the running direction dir, and the stop position x, based on changes in measurements taken by the distance sensor S1 while the car 1 decelerates and stops due to a power outage. Furthermore, the light-load direction determination unit 24 determines the light-load direction of the car 1 based on the various parameters calculated by the parameter calculation unit 21 and elevator specification information 231 stored in the memory unit 23. The memory unit 23 stores, as the elevator specification information 231, the rated load capacity Rc of the car, the car weight Wcar, the counterweight mass Wcwt, the roping Rpg, the main rope mass w1, the counterchain mass w2, and the ascending / descending stroke TR. Furthermore, the operation direction determination unit 25 determines the operation direction of the car based on the light-load direction determined by the light-load direction determination unit 24.

[0030] That is, the power failure operation device 20 uses the distance sensor S1, which is inexpensive and easy to install. The distance sensor S1 is attached to the top of the car, and the light load direction is identified by a calculation process using information on measurements obtained by the distance sensor S1 and elevator specification information 231 pre-stored in the memory unit 23, and the calculation does not require information measured by a weight sensor. Therefore, the power outage operation device 20 can identify the light load direction easily and at low cost without requiring retrofitting of a weight sensor, and the identified light load direction information can be used to control elevator operation during a power outage.

[0031] [Second embodiment] The following describes an elevator operation device during power outages according to the second embodiment. As shown in Fig. 6, the operation device during power outages according to the second embodiment differs from the first embodiment in that the elevator specification information 232 stored in the storage unit 23 further includes a braking rate τp and an overbalance rate γ, and that the light load direction determination unit 24 calculates the car load rate β by calculation processing using the following equations (7) to (13). In other respects, the second embodiment is the same as the first embodiment. In the following description, the differences will be described, and a description of the same configuration as the first embodiment will be omitted.

[0032] The light load direction determination unit 24 calculates the car load factor β by calculation processing using the following equations (7) to (13), and determines the upward direction as the light load direction if the calculated car load factor β is less than 50%, and determines the downward direction as the light load direction if the car load factor β is 50% or more.

[0033] The light load direction determination unit 24 first calculates the deceleration α bks (m / s 2 In equation (7), the values ​​calculated by the parameter calculation unit 21 are substituted for the speed Vmax (m / min) immediately before the start of deceleration and the braking distance Ls (mm).

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[0041] [Third embodiment] The following describes the operation device for an elevator during a power outage according to the third embodiment. As shown in Fig. 7, the operation device for an elevator during a power outage according to the third embodiment stores the unbalanced mass R of the ropes in elevator specification information 233 stored in storage unit 23. R The second embodiment differs from the first embodiment in that it further includes the running loss Loss, the car conversion coefficient dsk, the hoist inverse efficiency ηb, the hoist moment of inertia Jm, the hoist motor moment of inertia Jr, the deflector sheave inertia mass Gd, the car hoist inertia mass Gcar, the counterweight hoist inertia mass Gcwt, the counterweight inertia mass Gcom, the main rope mass correction coefficient Rw depending on the machine room position, the moving cable mass w3, and the governor rope mass w4, and in that the light load direction determination unit 24 calculates the car load factor β by calculation processing using the following equations (14) to (23).In the following explanation, the differences will be explained, and explanations of the same configuration as in the first embodiment will be omitted.

[0042] The light load direction determination unit 24 calculates the car load factor β by calculation processing using the following equations (14) to (23), and determines the light load direction to be the upward direction if the calculated car load factor β is less than 50%, and the light load direction to be the downward direction if the car load factor β is 50% or more.

[0043] The light load direction determination unit 24 first calculates the deceleration α bks (m / s 2 In equation (14), the values ​​calculated by the parameter calculation unit 21 are substituted for the speed Vmax (m / min) immediately before the start of deceleration and the braking distance Ls (mm).

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[0054] In the above embodiments, the case where the distance sensor S1 is attached to the top of the car 1 has been described, but the distance sensor S1 may be attached to the bottom of the car 1. In this case, the distance sensor S1 can measure the distance to the bottom of the elevator shaft 7, and the parameter calculation unit 21 calculates various parameters based on the measured values ​​measured by this distance sensor S1.

[0055] In the above-described embodiments, a distance sensor is attached to the car 1, and various parameters are calculated based on measurements taken by the distance sensor. However, this is not limiting. For example, an acceleration sensor may be attached to the car 1, and various parameters may be calculated based on measurements taken by the acceleration sensor. In this case, the parameter calculation unit 21 can calculate the speed of the car 1 at each point in time by integrating the acceleration of the car 1 measured by the acceleration sensor. Furthermore, by further integrating this speed, the parameter calculation unit 21 can calculate the distance traveled by the car 1 at each point in time relative to a predetermined reference position. Therefore, the parameter calculation unit 21 calculates the speed and position of the car 1 at each point in time based on changes in measurements taken by the acceleration distance sensor, for example, during the time the car 1 decelerates and stops due to a power outage. Then, based on the speed change, the time the car 1 starts deceleration and the time it stops are identified, and the speed Vmax immediately before the start of deceleration and the traveling direction dir during deceleration are calculated. The position of the car 1 at the time deceleration starts and the position of the car 1 at the time it stops (stop position x) are calculated, and the braking distance Ls, which is the difference between these positions, is calculated. [Explanation of symbols]

[0056] 1 basket 2 counterweight 5. Rope 6 Hoisting machine 7 Elevator Shaft 10 Normal operation device 11 Power outage detection unit 12 Normal operation control unit 20 Power outage operation device 21 Parameter calculation section 23 Memory section 24 Light load direction determination section 25 Driving direction determination unit 26 Power outage operation control unit F1, F2 floors S1 Distance Sensor 100 Elevator 231, 232, 233 Elevator Specification Information

Claims

1. A power failure operation device that controls the operation of an elevator equipped with a distance sensor at the top or bottom of the car during a power failure, a parameter calculation means for calculating various parameters including a braking distance of the car, a speed just before the start of deceleration, a traveling direction, and a stop position based on changes in measurements measured by the distance sensor during the time when the car decelerates and stops due to a power outage; a storage unit storing elevator specification information including the rated load capacity of the car, the mass of the car, the mass of a counterweight, roping, the mass of a main rope, the mass of a counterchain, and an elevation stroke; a light-load direction determination means for determining a light-load direction, which is an operating direction in which regenerative power of the car is generated, based on the various parameters calculated by the parameter calculation means and the elevator specification information stored in the storage unit; and an operating direction determining means for determining the operating direction of the car based on the determined light load direction.

2. A power failure operation device that controls the operation of an elevator equipped with an acceleration sensor in a car during a power failure, a parameter calculation means for calculating various parameters including a braking distance of the car, a speed immediately before the start of deceleration, a traveling direction, and a stop position based on changes in measurements measured by the acceleration sensor during the time when the car decelerates and stops due to a power outage; a storage unit storing elevator specification information including the rated load capacity of the car, the mass of the car, the mass of a counterweight, roping, the mass of a main rope, the mass of a counterchain, and an elevation stroke; a light-load direction determination means for determining a light-load direction, which is an operating direction in which regenerative power of the car is generated, based on the various parameters calculated by the parameter calculation means and the elevator specification information stored in the storage unit; and an operating direction determining means for determining the operating direction of the car based on the determined light load direction.

3. the light load direction determination means calculates a car load factor based on the calculated braking distance, the calculated speed immediately before deceleration starts, and elevator specification information stored in the storage unit, and determines the light load direction by comparing the calculated car load factor with a threshold value; 3. The device for operating during a power outage according to claim 1 or claim 2, wherein the driving direction determination means determines a driving direction that requires less power for driving to the nearest floor based on the calculated load factor in the car, a first driving distance when the stopped car is driven to the nearest floor above, and a second driving distance when the stopped car is driven to the nearest floor below, and determines the determined driving direction as the driving direction of the car.

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