JP2018095422A - Oil leakage detection system in hydraulic elevator, oil leakage detection device, and oil leakage detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil leakage detection system, an oil leakage detection device, and an oil leakage detection method which allow for detection of grasping a situation of oil leakage in a hydraulic elevator in detail and notifying a customer engineer of it.SOLUTION: An oil leakage detection system includes a first sensor, a second sensor, and an oil leakage detection device. The first sensor is provided in a tray installed in an oil leakage detection target part in the hydraulic elevator and detects that a preset first amount of oil is accumulated in the tray. The second sensor is installed in the tray and detects that a second amount of oil which is larger than the first amount is accumulated in the tray. When the accumulation of the first amount of oil in the tray is detected by the first sensor, the oil leakage detection device outputs first notification information. When the accumulation of the second amount of oil in the tray is detected by the second sensor, the oil leakage detection device outputs second notification information whose importance is higher than that of the first notification information.SELECTED DRAWING: Figure 3

Description

  Embodiments described herein relate generally to an oil leak detection system, an oil leak detection device, and an oil leak detection method in a hydraulic elevator.

  A generally used hydraulic elevator is configured by connecting a hydraulic power unit installed in a machine room and a hydraulic jack installed in a hoistway by hydraulic piping. In the hydraulic power unit, the rotary motion of the hydraulic pump is driven by the electric motor to generate pressure oil, which is sent to the cylinder of the hydraulic jack, and the plunger is pushed up to raise the connected car. The car is lowered by returning the oil in the cylinder to the hydraulic pump.

  In the hydraulic elevator configured as described above, oil leakage is likely to occur from the gap between the hydraulic pump main body and the rotating shaft thereof, and therefore, a mechanical seal is applied to the portion to prevent oil leakage. However, even if such measures are taken, oil may ooze from the sliding surface of the shaft due to its structure. In view of this, a tray is provided at the bottom of the hydraulic pump to collect the oil that has oozed out, and maintenance personnel perform a disposal process during regular inspections to prevent the oil from flowing out.

JP-A-10-120334

  However, in the oil leakage disposal process described above, when the amount of oil leaking increases, maintenance personnel cannot recognize this until the next periodic inspection, and the oil exceeds the capacity of the tray. As a result, there was a problem that it could flow out to the outside and not take sufficient measures.

  The present invention has been made in view of the above circumstances, an oil leak detection system, an oil leak detection device capable of detecting in detail a situation of oil leak in a hydraulic elevator and informing a maintenance staff, and The purpose is to provide an oil leak detection method.

  According to the embodiment for achieving the above object, the oil leak detection system includes a first sensor, a second sensor, and an oil leak detection device. A 1st sensor is provided in the saucer installed in the oil leak detection object location in a hydraulic elevator, and detects that the preset 1st quantity of oil collected in the saucer. The second sensor is installed in the saucer and detects that a second amount of oil larger than the first amount has accumulated in the saucer. When the first sensor detects that the first amount of oil has accumulated in the tray, the oil leak detection device outputs first notification information, and the second sensor accumulates the second amount of oil in the tray. If detected, the second notification information having higher importance than the first notification information is output.

1 is an overall view showing a configuration of a hydraulic elevator equipped with an oil leakage detection system according to an embodiment. The side view which shows the hydraulic pump of the hydraulic elevator by which the oil leak detection system by one Embodiment is mounted. The external view of the oil leak detection system by one Embodiment. The block diagram which shows the structure of the oil leak detection system by one Embodiment. The flowchart which shows operation | movement of the oil leak detection apparatus of the oil leak detection system by one Embodiment. In the oil leakage detection system according to one embodiment, (a) an explanatory diagram showing detection timing of a first detection signal when the first detection time is shorter than the first set time, (b) the first detection time is set first. Explanatory diagram showing the detection timing of the first detection signal when longer than the time, (c) Explanatory diagram showing the detection timing of the second detection signal when the second detection time is shorter than the second set time, (d) Explanatory drawing which shows the detection timing of a 2nd detection signal when 2nd detection time is longer than 2nd setting time. An example of (a) output information for each first detection time and (b) output information for each second detection time set in the oil leak detection device of the oil leak detection system according to the embodiment. (A), (b) is explanatory drawing which shows the installation state of the 1st sensor and 2nd sensor of the oil leak detection system by other embodiment.

<Configuration of hydraulic elevator equipped with oil leakage detection system according to one embodiment>
A configuration of a hydraulic elevator equipped with an oil leak detection system according to an embodiment of the present invention will be described with reference to FIG. The hydraulic elevator 1 according to this embodiment includes a hydraulic power unit 21 and an elevator control panel 22 installed in a machine room 2 in a building, a hydraulic jack 31 and a car 32 installed in a hoistway 3, a hydraulic power unit 21 and a hydraulic pressure. The hydraulic piping 4 which connects the jack 31 is provided. The hydraulic power unit 21 includes a hydraulic pump 211 and an electric motor 212.

  As shown in FIG. 2, the hydraulic pump 211 includes a hydraulic pump main body 211 a, a rotating shaft 211 b connected to the hydraulic pump main body 211 a, and a pulley 211 c that rotates the rotating shaft 211 b with the power of the electric motor 212. Then, the rotary shaft 211 b rotates to apply pressure to the oil in the hydraulic pump main body 211 a to generate pressure oil, which is sent to the hydraulic jack 31 via the hydraulic pipe 4. The elevator control panel 22 raises and lowers the car 32 by controlling the operation of the hydraulic power unit 21.

  The hydraulic jack 31 includes a plunger 311 connected to the car 32 and a cylinder 312 that moves the plunger 311 up and down. The cylinder 312 is operated by the pressure oil sent from the hydraulic pump 211 via the hydraulic pipe 4. The oil leak detection system 50 is installed below the hydraulic pump 211 in the machine room 2 of the hydraulic elevator 1 configured as described above.

  As shown in FIG. 3, the oil leak detection system 50 includes a first sensor 51, a second sensor 52, and an oil leak detection device 53. The first sensor 51 and the second sensor 52 are oil leak detection target locations where the oil leak of the hydraulic pump 211 may occur, for example, a saucer placed below the gap between the hydraulic pump main body 211a and the rotating shaft 211b. 54. A convex portion 54 a is provided on the bottom surface of the tray 54, and the first sensor 51 is installed at a low position in the tray 54, avoiding the convex portion 54 a, and has a preset first amount, for example, the capacity of the tray 54. When 50% of the oil has accumulated in the tray 54, this is detected. The second sensor 52 is installed on the convex portion 54a of the bottom surface that is higher than the first sensor 51 in the tray 54, and is a second amount larger than the first amount, for example, 80% of the capacity of the tray 54. When an amount of oil has accumulated in the tray 54, it is detected.

  A detailed configuration of the oil leakage detection system 50 will be described with reference to FIG. The first sensor 51 includes a first detection unit 511, a first reset button 512, and a first conversion unit 513. The first detection unit 511 detects when the first amount of oil has accumulated in the tray 54 and outputs a first detection signal. The first reset button 512 is a button that is operated when oil in the tray 54 is discarded during regular inspection by a maintenance staff, and outputs a first reset signal by the operation. The first conversion unit 513 converts the first detection signal output from the first detection unit 511 and the first reset signal output from the first reset button 512 into a voltage level signal and outputs the voltage level signal to the oil leak detection device 53. .

  Similarly, the second sensor 52 includes a second detection unit 521, a second reset button 522, and a second conversion unit 523. The second detector 521 detects when a second amount of oil has accumulated in the tray 54, and outputs a second detection signal. The second reset button 522 is a button that is operated when the oil in the tray 54 is discarded at the time of periodic inspection by a maintenance staff, and outputs a second reset signal by the operation. The second conversion unit 523 converts the second detection signal output from the second detection unit 521 and the second reset signal output from the second reset button 522 into a voltage level signal and outputs the voltage level signal to the oil leak detection device 53. .

  The oil leakage detection device 53 includes an input unit 531, a control unit 532, a calculation unit 533, a recording unit 534, and an output unit 535. The input unit 531 is a first detection output from the first sensor 51. The signal, the first reset signal, the second detection signal and the second reset signal output from the second sensor 52 are input. The control unit 532 includes a signal processing unit 532a, a notification determination unit 532b, and a notification information generation unit 532c. Based on the signal input from the input unit 531, the signal processing unit 532 a controls calculation processing to be executed by the calculation unit 533 and information recording processing to the recording unit 534. When the first detection signal is input from the input unit 531, the notification determination unit 532 b receives the first detection signal within a predetermined time from the input of the previous first reset signal based on the processing by the signal processing unit 532 a. Determine whether it was entered. That is, it is determined whether or not the first amount (50% of the amount of the tray 54) of oil has accumulated within a predetermined time after the oil in the tray 54 has been discarded. In addition, when the second detection signal is input from the input unit 531, the notification determination unit 532 b performs the second detection signal within a predetermined time from the input of the previous second reset signal based on the processing by the signal processing unit 532 a. It is determined whether or not is input. That is, it is determined whether or not the second amount (80% amount of the tray 54) of oil has accumulated within a predetermined time after the oil in the tray 54 has been discarded. In addition, when the second detection signal is input, the notification determination unit 532b determines whether or not the second amount of oil has accumulated from the first amount at a faster speed than before based on the processing by the signal processing unit 532a. Judging. When the notification determination unit 532b determines that the first amount of oil has accumulated within a predetermined time when the first detection signal is input, the notification information generation unit 532c maintains the oil discarding process of the tray 54. Attention information to urge the staff is generated. In addition, when the notification detection unit 532b determines that the second amount of oil has accumulated within a predetermined time when the second detection signal is input, the notification information generation unit 532c may overflow with oil from the tray 54. Therefore, warning information for warning that oil disposal processing should be executed is generated. In addition, when it is determined that the second amount of oil has accumulated from the first amount at a faster speed than before, the notification information generation unit 532c generates alarm information for warning that the parts should be replaced.

  The calculation unit 533 includes a time information acquisition unit 533a and a detection time calculation unit 533b. The time information acquisition unit 533a is the time when the first reset signal, the second reset signal, the first detection signal, or the second detection signal is input from the input unit 531 under the control of the signal processing unit 532a of the control unit 532. Get information. When the first detection signal is input from the input unit 531 under the control of the signal processing unit 532a, the detection time calculation unit 533b until the first detection signal is input after the first reset signal is input. The first detection time is calculated. The detection time calculator 533b calculates a second detection time from when the second reset signal is input to when the second detection signal is input when the second detection signal is input from the input unit 531. To do. The detection time calculation unit 533b calculates a third detection time from when the first detection signal is input to when the second detection signal is input when the second detection signal is input.

  The recording unit 534 includes a time information recording unit 534a and a detection time information recording unit 534b. The time information recording unit 534a displays time information when the first reset signal, the second reset signal, the first detection signal, and the second detection signal acquired by the time information acquisition unit 533a of the calculation unit 533 are input. Remember. The detection time information recording unit 534b records the first detection time, the second detection time, and the third detection time acquired by the detection time calculation unit 533b of the calculation unit.

  The output unit 535 transmits notification information such as caution information and alarm information generated by the notification information generation unit 532c of the control unit 532 to the external monitoring center device, the portable terminal of the maintenance staff, the elevator control panel 22, and the like.

<Operation of Oil Leak Detection System According to One Embodiment>
Next, the operation of the oil leak detection system according to this embodiment will be described. First, the maintenance staff discards the oil accumulated in the tray 54 during the periodic inspection work of the hydraulic elevator 1 and operates the first reset button 512 of the first sensor 51 and the second reset button 522 of the second sensor 52. . When the first reset button 512 is operated, the first conversion unit 513 converts the operation information into a first reset signal of a voltage level signal and outputs it to the oil leak detection device 53. Further, when the second reset button 522 is operated, the operation information is converted into a second reset signal of the voltage level signal in the second conversion unit 523 and output to the oil leak detection device 53.

  The processing executed after the first reset signal and the second reset signal are acquired in the oil leak detection device 53 will be described with reference to the flowchart of FIG. In the oil leak detection device 53, when the first reset signal and the second reset signal are acquired (“YES” in S 1), the oil leak detection device 53 is input from the input unit 531 and sent to the control unit 532. In the control unit 532, the time information when the first reset signal is input and the time information when the second reset signal is input are acquired by the time information acquisition unit 533a of the calculation unit 533 under the control of the signal processing unit 532a, and the recording unit It is recorded in the time information recording unit 534a of 534 (S2).

  Thereafter, the hydraulic power unit 21 is operated by the operation of the hydraulic elevator 1, and when oil leaks from the gap between the hydraulic pump main body 211a and the rotating shaft 211b, the hydraulic power unit 21 is accumulated in the tray 54. When 50% of the oil in the capacity of the tray 54 is collected, the oil is detected by the first detection unit 511 of the first sensor 51. When the first detection unit 511 detects oil, the first conversion unit 513 converts the detection information into a first detection signal that is a voltage level signal and outputs the first detection signal to the oil leak detection device 53.

  In the oil leak detection device 53, the first detection signal transmitted from the first sensor 51 is input from the input unit 531 (“YES” in S <b> 3) and sent to the control unit 532. In the control unit 532, the time information when the first detection signal is input in the time information acquisition unit 533a of the calculation unit 533 is acquired by the control of the signal processing unit 532a, and is recorded in the time information recording unit 534a of the recording unit 534. . Then, the difference between the time information when the first detection signal is input by the detection time calculation unit 533b and the time information when the first reset signal is input last time recorded in the time information recording unit 534a of the recording unit 534. That is, the first detection time from when the first reset signal is input to when the first detection signal is input is calculated and recorded in the detection time information recording unit 534b of the recording unit 534 (S4).

  The first detection time calculated by the detection time calculation unit 533b is sent from the signal processing unit 532a of the control unit 532 to the notification determination unit 532b, and the first detection time is shorter than the preset first setting time. Is determined (S5). The first set time is set based on the installation position of the first sensor 51 in the tray 54 within the inspection work interval (M) of the hydraulic elevator 1. For example, when the inspection work interval (M) is “one month” and the first sensor 51 is installed at a position where it detects that 50% of the amount of oil in the capacity of the tray 54 has accumulated, the first The set time is set to “2 weeks” calculated by (1/2) × M.

  Here, as shown in FIG. 6A, when it is determined that the first detection time is shorter than the first set time (1/2) × M (“YES” in S5), that is, the previous tray 54. When it is determined that the first amount (50% of the tray 54) of oil has accumulated in the tray 54 within a short period of time after the waste oil is disposed of, the notification information generation unit 532c displays the information shown in FIG. As shown, attention information for prompting maintenance personnel to dispose of the oil in the tray 54 is generated. The generated attention information is transmitted from the output unit 535 to the external monitoring center device or the portable terminal of the maintenance staff (S6). As shown in FIG. 6B, when it is determined that the first detection time is longer than the first set time (1/2) × M (“NO” in S5), the caution information is Not generated.

  Thereafter, the leaked oil further accumulates in the saucer 54, and when 80% of the oil in the capacity of the saucer 54 accumulates, the oil is detected by the second detection unit 521 of the second sensor 52. When oil is detected by the second detection unit 521, the second conversion unit 523 converts the detection information into a second detection signal that is a voltage level signal and outputs the second detection signal to the oil leak detection device 53.

  In the oil leak detection device 53, the second detection signal transmitted from the second sensor 52 is input from the input unit 531 (“YES” in S 7) and sent to the control unit 532. In the control unit 532, the time information when the second detection signal is input is acquired by the time information acquisition unit 533a of the calculation unit 533 under the control of the signal processing unit 532a, and is recorded in the time information recording unit 534a of the recording unit 534. . Then, the difference between the time information when the second detection signal is input by the detection time calculation unit 533b and the time information when the second reset signal is input last time recorded in the time information recording unit 534a of the recording unit 534. That is, the second detection time from when the second reset signal is input to when the second detection signal is input is calculated and recorded in the detection time information recording unit 534b of the recording unit 534 (S8).

  The second detection time calculated by the detection time calculation unit 533b is sent from the signal processing unit 532a of the control unit 532 to the notification determination unit 532b, and the second detection time is shorter than a preset second set time. Is determined (S9). The second set time is a time longer than the first set time within the inspection work interval (M) of the hydraulic elevator 1 and is set based on the installation position of the second sensor 52 in the tray 54. For example, when the inspection work interval (M) is “one month” and the second sensor 52 is installed at a position where it is detected that 80% of the capacity of the tray 54 has accumulated, the second set time Is set to “3 weeks” calculated by (3/4) × M.

  Here, as shown in FIG. 6C, when it is determined that the second detection time is shorter than the second set time (3/4) × M (“YES” in S9), that is, the previous tray 54. When it is determined that the second amount (80% of the tray 54) of oil has accumulated in the tray 54 in a short time after the waste oil is disposed of, the notification information generating unit 532c overflows from the tray 54. Since there is a possibility, warning information for notifying that the oil disposal process should be executed is generated. In the present embodiment, the alarm information is generated as information having a higher importance level than the attention information generated in step S6 or the like. The generated alarm information is transmitted from the output unit 535 to an external monitoring center device or a maintenance worker's portable terminal (S10).

  In addition, when it is determined that the second detection time is longer than the second set time (“NO” in S9), the maintenance staff is informed that the tray 54 should be confirmed in the next inspection operation. Attention information to generate is generated. The generated attention information is transmitted from the output unit 535 to an external monitoring center or a portable terminal of a maintenance worker (S11).

  When the second detection signal is input from the input unit 531, the first detection signal is input based on information recorded in the time information recording unit 534a in the detection time calculation unit 533b under the control of the signal processing unit 532a. The third detection time from the time when the second detection signal is input to the time when the second detection signal is input is calculated. The calculated third detection time is recorded in the detection time information recording unit 534b of the recording unit 534 (S12).

  In the present embodiment, every time the maintenance staff discards the oil in the tray 54 during the periodic inspection, the first reset button 512 and the second reset button 522 are operated, and the first sensor 51 and the second sensor 52 newly detect the oil. Processing has started.

  When the third detection time calculated in step S12 is recorded in the detection time information recording unit 534b (before the latest periodic inspection) in the detection time information recording unit 534b ("S13" YES ”), the previously calculated third time information and the currently calculated third detection time are sent from the signal processing unit 532a to the notification determining unit 532b. Then, the notification determination unit 532b determines whether or not the third detection time calculated this time is shorter than the third detection time calculated last time (S14).

  As a result of the determination, when the third detection time calculated this time is shorter than the third calculation time calculated last time (“YES” in S14), oil leakage continues to occur and the amount of leakage increases. Therefore, alarm information indicating that parts replacement is necessary is generated. The generated alarm information is transmitted from the output unit to the external monitoring center apparatus and the portable terminal of the maintenance staff, and is also transmitted to the elevator control panel 22 (S15). When the alarm information is acquired, the elevator control panel 22 stops the car 32 to the nearest floor for parts replacement work. Here, when alarm information is acquired by the elevator control panel 22, if the car 32 is landing on any floor, it is stopped as it is, and when the car 32 is between any floor, Stop at the nearest floor by moving downward without the need to supply pressure oil.

  When there is no previously recorded information on the third detection time in Step S13 (“NO” in S13), and when the current third detection time is longer than the previous third detection time in Step S14 When the next periodic inspection execution time comes (“NO” in S14) (“YES” in S16), the process returns to step S1.

  Further, after the first detection signal is input, when the next periodic inspection execution time comes without receiving the second detection signal in step S7 (“YES” in S17), the notification information generation unit 532c performs the next time. Attention information for notifying maintenance personnel that the tray 54 should be confirmed in the inspection work is generated. The generated attention information is transmitted from the output unit 535 to the external monitoring center or the portable terminal of the maintenance staff, and then returns to step S1 (S18).

  According to the above embodiment, maintenance personnel can appropriately deal with oil leakage by grasping in detail the occurrence status of oil leakage at the connection part of the components in the hydraulic elevator and outputting notification information according to the situation. Can be taken.

  In the embodiment described above, the convex portion 54a is provided on the bottom surface of the tray 54, the first sensor 51 is installed at a position avoiding the convex portion 54a, and the second sensor 52 is installed on the convex portion 54a. The height of the first sensor 51 is different from the height of the second sensor 52. However, the present invention is not limited to this configuration, and other forms may be employed as long as the first sensor 51 and the second sensor 52 are installed at different heights. For example, the first sensor 51 and the second sensor 52 are installed at positions where the heights of the side walls in the tray 54 are different as shown in FIG. 8 (a), or are inclined as shown in FIG. 8 (b). The bottom of the tray 54 may be installed at a different position.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Hydraulic elevator, 2 ... Machine room, 3 ... Hoistway, 4 ... Hydraulic piping, 21 ... Hydraulic power unit, 22 ... Elevator control panel, 31 ... Hydraulic jack, 32 ... Car, 50 ... Oil leak detection system, 51 ... 1st sensor 52 ... 2nd sensor 53 ... Oil leak detection device 54 ... Receptacle 54a ... Convex part 211 ... Hydraulic pump 211a ... Hydraulic pump body 211b ... Rotating shaft 211c ... Pulley 212 ... Electric motor 311 ... Plunger, 312 ... Cylinder, 511 ... 1st detection part, 512 ... 1st reset button, 513 ... 1st conversion part, 521 ... 2nd detection part, 522 ... 2nd reset button, 523 ... 2nd conversion part, 531 ... Input unit, 532 ... Control unit, 532a ... Signal processing unit, 532b ... Notification determination unit, 532c ... Notification information generation unit, 533 ... Calculation unit, 533a ... Time information acquisition unit, 33b ... detection time calculation unit, 534 ... recording unit, 534a ... time information recording unit, 534b ... detection time information recording unit, 535 ... output unit

According to the embodiment for achieving the above object, the oil leak detection system includes a first sensor, a second sensor, and an oil leak detection device. A 1st sensor is provided in the saucer installed in the oil leak detection object location in a hydraulic elevator, and detects that the preset 1st quantity of oil collected in the saucer. The second sensor is installed in the saucer and detects that a second amount of oil larger than the first amount has accumulated in the saucer. The oil leak detection device outputs first notification information when the first sensor detects that the first amount of oil has accumulated in the tray in a shorter time than the predetermined time, and the second sensor detects the predetermined time. If it is detected that the second amount of oil has accumulated in the tray in a shorter time than the second notification information .

According to the embodiment for achieving the above object, the oil leak detection system includes a first sensor, a second sensor, and an oil leak detection device. A 1st sensor is provided in the saucer installed in the oil leak detection object location in a hydraulic elevator, and detects that the preset 1st quantity of oil collected in the saucer. The second sensor is installed in the saucer and detects that a second amount of oil larger than the first amount has accumulated in the saucer. The oil leak detection device outputs first notification information when the first sensor detects that the first amount of oil has accumulated in the tray in a shorter time than the predetermined time, and the second sensor detects the predetermined time. If it is detected that the second amount of oil has accumulated in the tray in a shorter time than the first notification information, the second notification information having higher importance than the first notification information is output.

Claims (6)

A first sensor provided in a saucer installed at an oil leak detection target location in a hydraulic elevator, and detecting that a first preset amount of oil has accumulated in the saucer;
A second sensor installed in the saucer for detecting that a second amount of oil greater than the first amount has accumulated in the saucer;
When the first sensor detects that the first amount of oil has accumulated in the saucer, it outputs first notification information, and the second sensor causes the second amount of oil to accumulate in the saucer. An oil leakage detection system in a hydraulic elevator, comprising: an oil leakage detection device that outputs second notification information that is higher in importance than the first notification information. A first sensor provided in a saucer installed at an oil leak detection target location in a hydraulic elevator, and detecting that a first preset amount of oil has accumulated in the saucer;
A second sensor that is installed in the saucer and detects that a second amount of oil greater than the first amount has accumulated in the saucer;
When the first sensor detects that the first amount of oil has accumulated in the tray, the first notification information is output, and the second sensor determines that the second amount of oil has accumulated in the tray. Then, the oil leak detection device characterized in that the second notification information having higher importance than the first notification information is output. When the first sensor determines that the first amount of oil has accumulated in the tray in a shorter time than a predetermined time, the first notification information is output, and the second sensor has a shorter time than the predetermined time. 3. The oil leak detection device according to claim 2, wherein the second notification information is output when it is determined that the second amount of oil has accumulated in the tray. Each time the oil in the tray is discarded, a detection process is newly started by the first sensor and the second sensor,
From the time when the first sensor detects that the first amount of oil has accumulated in the tray until the second sensor detects that the second amount of oil has accumulated in the tray. 4. The third notification information is output when the detection time is calculated, and it is determined that the detection time calculated this time is shorter than the detection time calculated last time. 5. Oil leak detection device. The third notification information is output to a control panel of the hydraulic elevator in order to land the car of the hydraulic elevator on the nearest floor when the third notification information is generated. 4. The oil leak detection device according to 4. A first sensor provided in a saucer installed at an oil leak detection target location in a hydraulic elevator, and detecting that a first preset amount of oil has accumulated in the saucer;
An oil leakage detection device installed in the saucer and connected to a second sensor for detecting that a second amount of oil larger than the first amount has accumulated in the saucer,
When the first sensor detects that the first amount of oil has accumulated in the saucer, it outputs first notification information, and the second sensor causes the second amount of oil to accumulate in the saucer. When it is detected that the second notification information having higher importance than the first notification information is output, the oil leakage detection method.

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