JP6958487B2 - Elevator device - Google Patents

Description

The present invention relates to a hydraulic elevator device.

Patent Document 1 describes a hydraulic elevator device. The elevator device described in Patent Document 1 is provided with a dedicated detection sensor for detecting the oil level in the oil tank. An oil leak is detected by this detection sensor.

JP-A-2007-302365

The elevator device described in Patent Document 1 requires a dedicated sensor to detect an oil leak. Therefore, there is a problem that the configuration of the elevator device becomes complicated.

The present invention has been made to solve the above-mentioned problems. An object of the present invention is to provide an elevator device capable of detecting an oil leak with a simple configuration.

The elevator device according to the present invention measures the pressure of a hydraulic jack for moving an elevator car up and down, a hydraulic power unit connected to the hydraulic jack via a pipe, and oil sent from the hydraulic power unit to the pipe. And an integration means that integrates the values measured by the pressure gauge between the time when the car departs from a specific first departure floor and the time when the car stops at a specific first arrival floor above the first departure floor. The time measuring means for measuring the time taken from the time when the car departs from the first departure floor to the stop at the first arrival floor, the integrated value calculated by the integrating means, and the time measured by the time measuring means. A detection means for detecting an oil leak based on the ratio with and is provided.

With the elevator device according to the present invention, oil leakage can be detected with a simple configuration.

It is a figure which shows the example of the elevator device in Embodiment 1. FIG. It is a figure which shows the example of the determination apparatus. It is a flowchart which shows the operation example of the elevator apparatus in Embodiment 1. FIG. It is a flowchart which shows the other operation example of an elevator device. It is a figure which shows the example of the hardware resource of the determination device. It is a figure which shows another example of the hardware resource of the determination device.

The present invention will be described with reference to the accompanying drawings. Overlapping description will be simplified or omitted as appropriate. In each figure, the same reference numerals indicate the same parts or corresponding parts.

Embodiment 1.
FIG. 1 is a diagram showing an example of an elevator device according to the first embodiment. The elevator device includes, for example, a car 1, a hydraulic jack 2, a main rope 3, a pipe 4, a hydraulic power unit 5, a pressure gauge 6, a landing detection device 7, and a determination device 8.

The car 1 moves up and down the hoistway 11. The hydraulic jack 2 is a device for moving the car 1 up and down. The hydraulic jack 2 includes, for example, a cylinder 12, a plunger 13, and a sheave 14. The sheave 14 is rotatably provided at the upper end of the plunger 13. The cylinder 12 is erected in the pit of the hoistway 11. By supplying oil to the inside of the cylinder 12, the plunger 13 and the sheave 14 move upward. When the oil inside the cylinder 12 is drained, the plunger 13 and the sheave 14 move downward.

One end of the main rope 3 is connected to a fixed body at the top of the hoistway 11. The main rope 3 is wound around the suspension wheel 15 and the sheave 14 of the car 1. The other end of the main rope 3 is connected to a fixed body in the pit of the hoistway 11. Therefore, when the sheave 14 moves upward, the car 1 moves upward. When the sheave 14 moves downward, the car 1 moves downward.

One end of the pipe 4 is connected to the cylinder 12 of the hydraulic jack 2. The other end of the pipe 4 is connected to the hydraulic power unit 5. That is, the hydraulic power unit 5 is connected to the hydraulic jack 2 via the pipe 4. The hydraulic power unit 5 includes, for example, an oil tank 21, a pump 22, a motor 23, a switching valve 24, and a control valve 25.

The pump 22 is driven by a motor 23. The pump 22 is driven when the car 1 is moved upward. When the pump 22 is driven, the oil stored in the oil tank 21 is sent to the hydraulic jack 2 via the pipe 4. The amount of oil actually sent to the hydraulic jack 2 is adjusted by the control valve 25. On the other hand, when moving the car 1 downward, the weight of the car 1 or the like is used. The amount of oil returning from the hydraulic jack 2 to the oil tank 21 is adjusted by the control valve 25. The configuration of the hydraulic power unit 5 is not limited to the example shown in FIG.

The pressure gauge 6 measures the pressure of the oil sent from the hydraulic power unit 5 to the pipe 4. FIG. 1 shows an example in which the pressure gauge 6 is arranged inside the housing of the hydraulic power unit 5. The pressure gauge 6 may be provided in the pipe 4. The value information measured by the pressure gauge 6 is output to the determination device 8. For example, the pressure gauge 6 outputs the measured pressure value information to the determination device 8 at regular intervals.

The landing detection device 7 detects that the car 1 is arranged at the height of the landing 16. In the example shown in FIG. 1, the landing detection device 7 includes a photoelectric device 7a, a landing plate 7b, and a landing plate 7c. The photoelectric device 7a is provided in the car 1. The landing plate 7b is arranged according to the height of the landing 16 on the first floor. When the car 1 is arranged at the height of the landing 16 on the first floor, the landing plate 7b is detected by the photoelectric device 7a. Information indicating that the photoelectric device 7a has detected the landing plate 7b is output to the determination device 8. The landing plate 7c is arranged according to the height of the landing 16 on the second floor. When the car 1 is arranged at the height of the landing 16 on the second floor, the landing plate 7c is detected by the photoelectric device 7a. Information indicating that the photoelectric device 7a has detected the landing plate 7c is output to the determination device 8.

FIG. 2 is a diagram showing an example of the determination device 8. The determination device 8 includes, for example, a storage unit 31, a condition determination unit 32, an integration unit 33, a time measurement unit 34, a ratio calculation unit 35, an oil leak detection unit 36, and an operation control unit 37. The determination value and the reference value are stored in advance in the storage unit 31. Hereinafter, the operation of the elevator device will be described in detail with reference to FIG. FIG. 3 is a flowchart showing an operation example of the elevator device according to the first embodiment.

The condition determination unit 32 determines whether or not the condition for detecting the oil leak is satisfied (S101). In the following, the conditions for detecting an oil leak are also referred to as detection conditions. For example, the detection condition is satisfied when the car 1 moves on a specific route. The above route is, for example, a route in which the car 1 moves from a specific departure floor to a specific arrival floor. The arrival floor is the floor above the departure floor. In the following, an example in which the departure floor is the first floor and the arrival floor is the second floor will be described in detail. For example, when a passenger gets in the car 1 on the first floor and the passenger gets off on the second floor, the detection condition is satisfied (Yes in S101).

When the detection condition is satisfied, the determination device 8 determines whether or not the car 1 has departed from the departure floor, that is, the first floor (S102). The determination of S102 is performed based on, for example, a signal from the landing detection device 7. The determination of S102 may be performed based on the control signal from the hydraulic power unit 5. When the car 1 departs from the first floor, the integrating unit 33 starts integrating the values measured by the pressure gauge 6 (S103). When the car 1 departs from the first floor, the time measuring unit 34 starts measuring the time (S104).

When the car 1 departs from the departure floor, the determination device 8 determines whether or not the car 1 has stopped at the arrival floor, that is, the second floor (S105). The determination of S105 is performed based on, for example, a signal from the landing detection device 7. The determination of S105 may be performed based on the control signal from the hydraulic power unit 5. The processing of S103 and the processing of S104 are continued until the car 1 stops on the second floor.

When the car 1 stops on the second floor, the integrating unit 33 finishes calculating the integrated value (S106). That is, the integrating unit 33 integrates the values measured by the pressure gauge 6 from the time when the car 1 departs from the first floor to the time when the car 1 stops on the second floor. When the car 1 stops on the second floor, the time measurement unit 34 ends the time measurement (S107). That is, the time measuring unit 34 measures the time taken from when the car 1 departs from the first floor to when it stops on the second floor.

The ratio calculation unit 35 calculates the ratio between the integrated value calculated by the integration unit 33 and the time measured by the time measurement unit 34 (S108). The ratio calculation unit 35 may calculate a value based on the above ratio. For example, the ratio calculation unit 35 calculates the value of the above ratio.

The oil leak detection unit 36 determines whether or not an oil leak has occurred based on the ratio calculated by the ratio calculation unit 35 (S109). For example, the oil leak detection unit 36 compares the ratio value calculated by the ratio calculation unit 35 with the determination value stored in the storage unit 31. The oil leak detection unit 36 detects an oil leak if the difference between the calculated ratio value and the determination value is larger than the reference value (Yes in S109).

Until the car 1 stopped on the first floor moves to the second floor, the operation of the car 1 changes in the order of start-up, acceleration running, constant speed running, deceleration running, and stopping. At this time, the value measured by the pressure gauge 6 changes according to the operation of the car 1. Further, the value measured by the pressure gauge 6 shows a different value depending on the load of the car 1. However, the ratio calculated by the ratio calculation unit 35 shows a substantially constant value regardless of the load capacity of the car 1 unless oil leakage occurs in the hydraulic jack 2 or the pipe 4.

For example, learning operation is performed immediately after the elevator device is installed. In the learning operation, the car 1 moves from a specific departure floor to a specific arrival floor. Then, the ratio of the integrated value calculated by the integrating unit 33 to the time measured by the time measuring unit 34 is calculated by the same procedure as the procedure described above. The ratio calculated in the learning operation or a value based on the ratio is stored in the storage unit 31 as a determination value. After the maintenance and inspection are performed, the learning operation may be performed again to update the judgment value.

When the oil leak detection unit 36 detects an oil leak, the operation control unit 37 stops, for example, the car 1 at the landing 16 on the lowest floor (S110). Further, when the oil leak detection unit 36 detects the oil leak, the operation control unit 37 issues an external report (S111) to notify that the oil leak has occurred. For example, the operation control unit 37 transmits an abnormal signal indicating that an oil leak has occurred to the monitoring center.

In the example shown in the first embodiment, an oil leak can be detected by a simple configuration. For example, an instrument corresponding to the pressure gauge 6 is often provided in an existing hydraulic elevator device. Therefore, it can be easily deployed to the existing elevator device without adding a new instrument.

Further, in the example shown in the first embodiment, the occurrence of an oil leak can be detected when the elevator device provides a normal service. Therefore, it is not usually necessary to interrupt the service in order to check for oil leaks.

In the present embodiment, an example of starting the calculation of the integrated value and the measurement of the time when the detection condition is satisfied has been described. This is just an example. For example, the integrated value may be calculated and the time may be measured at all times, and when the detection condition is satisfied, the oil leak detection unit 36 may determine S109. In such a case, the ratio calculation unit 35 may calculate the ratio at all times or only when the detection condition is satisfied.

In the present embodiment, an example in which the detection condition is satisfied when the car 1 departs from the first floor and stops on the second floor has been described. This is just an example. The route for detecting an oil leak is not limited to this example. For example, when the car 1 moves from the second floor to the fourth floor, it may be determined whether or not an oil leak has occurred. Further, if the moving distance of the car 1 is the same, the ratio calculated by the ratio calculation unit 35 shows a substantially constant value. Therefore, a plurality of routes may be set as routes for detecting an oil leak. For example, the detection condition may be satisfied even when the car 1 moves on a specific second path. The second route is, for example, a route in which the car 1 moves from a specific second departure floor to a specific second arrival floor. The second arrival floor is the floor above the second departure floor.

For example, consider the case where the distance from the second floor to the third floor is the same as the distance from the first floor to the second floor. In such a case, for example, the detection condition is satisfied when a passenger gets in the car 1 on the first floor and the passenger gets off on the second floor. The detection condition is also satisfied when the passenger gets into the car 1 on the 3rd floor immediately after the passenger gets out of the car 1 on the 2nd floor. In such a case, the integrating unit 33 integrates the values measured by the pressure gauge 6 between the time when the car 1 departs from the second floor and the time when the car 1 stops on the third floor. The time measuring unit 34 measures the time taken from the time when the car 1 departs from the second floor to the time when the car 1 stops on the third floor. Then, the oil leak detection unit 36 determines whether or not an oil leak has occurred based on the ratio calculated by the ratio calculation unit 35.

As another example, the elevator device may further include a thermometer 9. The thermometer 9 measures the temperature of the oil in the hydraulic power unit 5. FIG. 1 shows an example in which the temperature of the oil stored in the oil tank 21 is measured by the thermometer 9. The temperature information measured by the thermometer 9 is output to the determination device 8.

The volume of oil changes with temperature. The ratio calculated by the ratio calculation unit 35 changes slightly depending on the temperature even if no oil leak occurs. Therefore, when the temperature measured by the thermometer 9 is lower than the specific first temperature, the oil leak detecting unit 36 does not have to detect the oil leak. For example, when the temperature measured by the thermometer 9 is lower than the specific first temperature, it is always determined as No in S101. When the temperature measured by the thermometer 9 is lower than the specific first temperature, it may always be determined as No in S109.

When the elevator device includes the thermometer 9, the storage unit 31 may store the first determination value for low temperature and the second determination value for high temperature in advance. In such a case, the determination device 8 is further provided with a selection unit 38. FIG. 4 is a flowchart showing another operation example of the elevator device. The operation flow shown in FIG. 4 is performed between, for example, the process shown in S101 of FIG. 3 and the process shown in S102.

The selection unit 38 selects the determination value to be used in S109 by the oil leak detection unit 36 from the plurality of determination values stored in the storage unit 31. In the example shown in this embodiment, the selection unit 38 selects the first determination value or the second determination value as the determination value used by the oil leak detection unit 36 in S109.

For example, when the detection condition is satisfied (Yes in S101), the selection unit 38 determines whether or not the temperature measured by the thermometer 9 is lower than the specific second temperature (S201). If the temperature measured by the thermometer 9 is lower than the second temperature, the selection unit 38 selects the first determination value for low temperature (S202). Therefore, when the temperature measured by the thermometer 9 is lower than the second temperature, the oil leak detection unit 36 is based on the ratio calculated by the ratio calculation unit 35 and the first determination value selected by the selection unit 38 in S109. To detect oil leaks.

Further, if the temperature measured by the thermometer 9 is the second temperature or higher, the selection unit 38 selects the second determination value for high temperature (S203). Therefore, when the temperature measured by the thermometer 9 is equal to or higher than the second temperature, the oil leak detection unit 36 sets the ratio calculated by the ratio calculation unit 35 and the second determination value selected by the selection unit 38 in S109. Detect oil leaks based on. In this example, oil leakage can be detected with high accuracy.

Even when the determination device 8 includes the selection unit 38, the oil leak detection unit 36 does not have to detect the oil leak if the temperature measured by the thermometer 9 is lower than the first temperature. In such a case, the first temperature is set to a temperature lower than the second temperature.

Each part indicated by reference numerals 31 to 38 indicates a function possessed by the determination device 8. FIG. 5 is a diagram showing an example of hardware resources of the determination device 8. The determination device 8 includes a processing circuit 40 including, for example, a processor 41 and a memory 42 as hardware resources. The function of the storage unit 31 is realized by, for example, the memory 42. The determination device 8 realizes the functions of the respective parts shown by reference numerals 32 to 38 by executing the program stored in the memory 42 by the processor 41.

FIG. 6 is a diagram showing another example of the hardware resource of the determination device 8. In the example shown in FIG. 6, the determination device 8 includes, for example, a processing circuit 40 including a processor 41, a memory 42, and dedicated hardware 43. FIG. 6 shows an example in which a part of the functions of the determination device 8 is realized by the dedicated hardware 43. All the functions of the determination device 8 may be realized by the dedicated hardware 43.

1 car, 2 hydraulic jack, 3 main rope, 4 piping, 5 hydraulic power unit, 6 pressure gauge, 7 landing detection device, 7a photoelectric device, 7b landing plate, 7c landing plate, 8 judgment device, 9 thermometer, 11 lift Road, 12 cylinders, 13 plungers, 14 sheaves, 15 suspension wheels, 16 landings, 21 oil tanks, 22 pumps, 23 motors, 24 switching valves, 25 control valves, 31 storage units, 32 condition judgment units, 33 integration units, 34 Time measurement unit, 35 ratio calculation unit, 36 oil leak detection unit, 37 operation control unit, 38 selection unit, 40 processing circuit, 41 processor, 42 memory, 43 dedicated hardware

Claims (6)

A hydraulic jack for moving the elevator car up and down,
A hydraulic power unit connected to the hydraulic jack via piping,
A pressure gauge for measuring the pressure of oil sent from the hydraulic power unit to the pipe, and
An integration means for integrating the values measured by the pressure gauge between the time when the car departs from the specific first departure floor and the time when the car stops at the specific first arrival floor above the first departure floor.
A time measuring means for measuring the time taken from when the car departs from the first departure floor to when the car stops at the first arrival floor.
A detecting means for detecting an oil leak based on the ratio of the integrated value calculated by the integrating means and the time measured by the time measuring means, and
Elevator device equipped with. The elevator device according to claim 1, further comprising an operation control means for stopping the car on the lowest floor and issuing an external alarm when an oil leak is detected by the detection means. Further equipped with a thermometer for measuring the temperature of oil in the hydraulic power unit,
The elevator device according to claim 1 or 2, wherein the detection means does not detect an oil leak if the temperature measured by the thermometer is lower than the specific first temperature. A storage means for storing the first determination value and the second determination value, and
A thermometer that measures the temperature of the oil in the hydraulic power unit,
Further prepare
The detection means
When the temperature measured by the thermometer is lower than the specific second temperature, an oil leak is detected based on the ratio and the first determination value.
The elevator device according to claim 1 or 2, wherein when the temperature measured by the thermometer is equal to or higher than the second temperature, oil leakage is detected based on the ratio and the second determination value. The detection means does not detect an oil leak if the temperature measured by the thermometer is lower than the specific first temperature.
The elevator device according to claim 4, wherein the first temperature is a temperature lower than the second temperature. The integrating means integrates the values measured by the pressure gauge between the time when the car departs from the specific second departure floor and the time when the car stops at the specific second arrival floor above the second departure floor. death,
The time measuring means measures the time taken from the car leaving the second departure floor to stopping at the second arrival floor.
The elevator according to any one of claims 1 to 5, wherein the distance from the second departure floor to the second arrival floor is the same as the distance from the first departure floor to the first arrival floor. Device.

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