JP2019210103A - Elevator device - Google Patents

Abstract

To provide an elevator device capable of detecting oil leakage with a simple structure.SOLUTION: The elevator device includes a hydraulic jack 2, a hydraulic power unit 5, a pressure gauge 6, an integration part 33, a time measuring part 34, and an oil leakage detection part 36. The integration part 33 integrates a value measured by the pressure gauge 6 until a car 1 stops at a first arrival floor after the car departs from a first departure floor. The time measuring part 34 measures the time taken until the car 1 stops at the first arrival floor after departing from the first departure floor. The oil leakage detection part 36 detects the oil leakage based on the ratio of an integrated value calculated by the integration part 33 and the time measured by the time measuring part 34.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hydraulic elevator device.

  Patent Document 1 describes a hydraulic elevator device. The elevator apparatus described in Patent Document 1 includes a dedicated detection sensor for detecting the oil level in the oil tank. Oil leakage is detected by this detection sensor.

JP 2007-302365 A

  In the elevator apparatus described in Patent Document 1, a dedicated sensor is required to detect oil leakage. For this reason, there existed a problem that the structure of an elevator apparatus became complicated.

  The present invention has been made to solve the above-described problems. An object of the present invention is to provide an elevator apparatus that can detect oil leakage with a simple configuration.

  An elevator apparatus according to the present invention measures a hydraulic jack for moving an elevator car up and down, a hydraulic power unit connected to the hydraulic jack via a pipe, and a pressure of oil sent from the hydraulic power unit to the pipe. And an accumulating means for accumulating values measured by the pressure gauge from when the car departs from a specific first departure floor to when it stops at a specific first arrival floor above the first departure floor Time measuring means for measuring the time taken from the departure of the first departure floor to the first arrival floor, the integrated value calculated by the integrating means and the time measured by the time measuring means And detecting means for detecting oil leakage based on the ratio.

  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 apparatus in Embodiment 1. FIG. It is a figure which shows the example of a determination apparatus. 3 is a flowchart showing an operation example of the elevator apparatus in the first embodiment. It is a flowchart which shows the other operation example of an elevator apparatus. It is a figure which shows the example of the hardware resource of a determination apparatus. It is a figure which shows the other example of the hardware resource of a determination apparatus.

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

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating an example of an elevator apparatus according to the first embodiment. The elevator apparatus 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 a cylinder 12, a plunger 13, and a sheave 14, for example. The sheave 14 is rotatably provided at the upper end portion of the plunger 13. The cylinder 12 is set up in a pit of the hoistway 11. When oil is supplied to the inside of the cylinder 12, the plunger 13 and the sheave 14 move upward. When the oil in 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 of the pit of the hoistway 11. For this reason, 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 through 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. When the car 1 is moved upward, the pump 22 is driven. 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 that is actually sent to the hydraulic jack 2 is adjusted by the control valve 25. On the other hand, when the car 1 is moved 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 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. Information on the value measured by the pressure gauge 6 is output to the determination device 8. For example, the pressure gauge 6 outputs information on the measured pressure value to the determination device 8 at a constant cycle.

  The landing detection device 7 detects that the car 1 is placed 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 7 a 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 7 a has detected the landing plate 7 b is output to the determination device 8. The hall plate 7c is arranged according to the height of the hall 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 illustrating 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 leakage detection unit 36, and an operation control unit 37. The determination value and the reference value are stored in the storage unit 31 in advance. Hereinafter, the operation of the elevator apparatus will be described in detail with reference to FIG. FIG. 3 is a flowchart showing an operation example of the elevator apparatus according to the first embodiment.

  The condition determination unit 32 determines whether or not a condition for detecting oil leakage is satisfied (S101). Hereinafter, a condition for detecting oil leakage is also referred to as a detection condition. For example, the detection condition is satisfied when the car 1 moves along a specific route. The 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 a 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 on 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 left the departure floor, that is, the first floor (S102). The determination in S102 is performed based on a signal from the landing detection device 7, for example. Based on the control signal from the hydraulic power unit 5, the determination in S102 may be performed. When the car 1 departs from the first floor, the accumulating unit 33 starts accumulating the values measured by the pressure gauge 6 (S103). When the car 1 leaves the first floor, the time measuring unit 34 starts measuring time (S104).

  In the determination device 8, when the car 1 leaves the departure floor, it is determined whether or not the car 1 has stopped on the arrival floor, that is, the second floor (S105). The determination of S105 is performed based on a signal from the landing detection device 7, for example. Based on the control signal from the hydraulic power unit 5, the determination in S105 may be performed. Until the car 1 stops on the second floor, the process of S103 and the process of S104 are continued.

  When the car 1 stops on the second floor, the integrating unit 33 ends the calculation of the integrated value (S106). That is, the integrating unit 33 integrates the values measured by the pressure gauge 6 from when the car 1 leaves the first floor until it stops on the second floor. When the car 1 stops on the second floor, the time measuring unit 34 ends the time measurement (S107). That is, the time measuring unit 34 measures the time taken from the time when the car 1 leaves the first floor until it stops at 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 ratio. For example, the ratio calculation unit 35 calculates the value of the ratio.

  The oil leak detector 36 determines whether or not an oil leak has occurred based on the ratio calculated by the ratio calculator 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. If the difference between the calculated ratio value and the determination value is greater than the reference value, the oil leak detection unit 36 detects oil leak (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 travel, constant speed travel, deceleration travel, and stop. 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 loaded load of the car 1 and the like unless oil leakage occurs in the hydraulic jack 2 or the pipe 4.

  For example, the learning operation is performed immediately after the elevator apparatus is installed. In the learning operation, the car 1 moves from a specific departure floor to a specific arrival floor. Then, the ratio between the integrated value calculated by the integrating unit 33 and the time measured by the time measuring unit 34 is calculated by the same procedure as 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 check is performed, the learning operation may be performed again to update the determination value.

  When the oil leak detection unit 36 detects an oil leak, the operation control unit 37 stops the car 1 at the landing 16 on the lowest floor, for example (S110). In addition, when an oil leak is detected by the oil leak detection unit 36, the operation control unit 37 issues a notification to the outside in order to notify that an oil leak has occurred (S111). 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, oil leakage can be detected with a simple configuration. For example, an instrument corresponding to the pressure gauge 6 is often provided in an existing hydraulic elevator device. For this reason, it can be easily deployed in an existing elevator apparatus without adding a new instrument.

  Further, in the example shown in the first embodiment, the occurrence of oil leakage can be detected when the elevator apparatus provides a normal service. For this reason, it is not necessary to interrupt normal service to check for oil leaks.

  In the present embodiment, an example has been described in which calculation of an integrated value and measurement of time are started when a detection condition is satisfied. This is an example. For example, the calculation of the integrated value and the time measurement are always performed, and when the detection condition is satisfied, the determination of S109 by the oil leakage detection unit 36 may be performed. In such a case, the ratio calculation by the ratio calculation unit 35 may be performed constantly 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 leaves the first floor and stops on the second floor has been described. This is an example. The path for detecting the 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 movement distance of the car 1 is the same, the ratio calculated by the ratio calculation unit 35 shows a substantially constant value. For this reason, you may set a some path | route as a path | route for detecting an oil leak. For example, the detection condition may be satisfied when the car 1 moves along a specific second route. 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 a floor above the second departure floor.

  For example, consider a 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 this case, for example, the detection condition is satisfied when the passenger gets on 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 on the car 1 on the third floor immediately after the passenger gets off the car 1 on the second floor. In such a case, the integrating unit 33 integrates the values measured by the pressure gauge 6 after the car 1 leaves the second floor and stops at the third floor. The time measuring unit 34 measures the time taken for the car 1 to depart from the second floor and stop 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 apparatus may further include a thermometer 9. The thermometer 9 measures the temperature of oil in the hydraulic power unit 5. FIG. 1 shows an example in which the temperature of oil stored in the oil tank 21 is measured by the thermometer 9. Information on the temperature measured by the thermometer 9 is output to the determination device 8.

  Oil volume varies with temperature. The ratio calculated by the ratio calculation unit 35 slightly changes depending on the temperature even when no oil leakage occurs. For this reason, when the temperature measured by the thermometer 9 is lower than the specific first temperature, the oil leak detection unit 36 may not 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 No in S101. When the temperature measured by the thermometer 9 is lower than the specific first temperature, it may always be determined No in S109.

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

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

  If the temperature measured by the thermometer 9 is equal to or higher than the second temperature, 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 determines that the ratio calculated by the ratio calculation unit 35 and the second determination value selected by the selection unit 38 are set in S109. Based on this, oil leak is detected. 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 may not 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 shown by the codes | symbols 31-38 shows the function which the determination apparatus 8 has. FIG. 5 is a diagram illustrating 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 the memory 42, for example. The determination device 8 implements the functions of the units indicated by reference numerals 32 to 38 by executing the program stored in the memory 42 by the processor 41.

  FIG. 6 is a diagram illustrating another example of hardware resources of the determination device 8. In the example illustrated in FIG. 6, the determination device 8 includes a processing circuit 40 including, for example, a processor 41, a memory 42, and dedicated hardware 43. FIG. 6 shows an example in which some of the functions of the determination device 8 are realized by the dedicated hardware 43. All of 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 vehicles, 16 landings, 21 oil tanks, 22 pumps, 23 motors, 24 switching valves, 25 control valves, 31 storage units, 32 condition judging units, 33 integrating 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 to move the elevator car up and down;
A hydraulic power unit connected to the hydraulic jack via a pipe;
A pressure gauge for measuring the pressure of oil sent from the hydraulic power unit to the pipe;
Integration means for integrating values measured by the pressure gauge from when the car leaves the specific first departure floor to when it stops at the specific first arrival floor above the first departure floor;
Time measuring means for measuring the time taken from the departure of the first departure floor to the stop of the first arrival floor;
Detecting means for detecting oil leakage based on a ratio between the integrated value calculated by the integrating means and the time measured by the time measuring means;
Elevator device equipped with.   The elevator apparatus according to claim 1, further comprising an operation control unit that stops the car at the lowest floor and issues an external notification when oil leakage is detected by the detection unit. A thermometer for measuring the temperature of oil in the hydraulic power unit;
The elevator apparatus according to claim 1 or 2, wherein the detection means does not detect oil leakage if the temperature measured by the thermometer is lower than a specific first temperature. Storage means for storing the first determination value and the second determination value;
A thermometer for measuring the temperature of oil in the hydraulic power unit;
Further comprising
The detection means includes
When the temperature measured by the thermometer is lower than a specific second temperature, oil leakage is detected based on the ratio and the first determination value,
The elevator apparatus 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 a specific first temperature,
The elevator apparatus according to claim 4, wherein the first temperature is lower than the second temperature. The integrating means integrates the values measured by the pressure gauge from when the car departs from a specific second departure floor to when it stops at a specific second arrival floor above the second departure floor. And
The time measuring means measures the time taken from the departure of the second departure floor to the stop of the second arrival floor.
The elevator according to any one of claims 1 to 5, wherein a distance from the second departure floor to the second arrival floor is the same as a distance from the first departure floor to the first arrival floor. apparatus.

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