Operation control system for elevator

Abstract

To move a car downward within the range of non-contact with a worker, in accordance with the posture or the like of the worker, while ensuring safety for the worker in work in a pit.SOLUTION: The present invention provides an operation control system 1 for an elevator including a car 20 that is disposed in a hoistway 11 so as to be vertically movable. The operation control system comprises: a transmitter 50 carried by a worker W working at a lowermost part of the hoistway 11 and configured to transmit a detection signal; one or more receivers 30 disposed in the car 20 and configured to receive the detection signal from the transmitter 50; and a control device 40 for controlling operation of the car 20, wherein the car 20 includes an apron 24 provided so as to extend downward from a lower portion on the entrance / exit side of the car 20, at least one of the receivers 30 is disposed in the apron 24, and the control device 40 is configured to stop movement of the car 20 when the receiver 30 receives the detection signal transmitted from the transmitter 50.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an elevator operation control system, and more particularly to an elevator operation control system for ensuring the safety of workers working at the bottom of an elevator hoistway. [Background technology]

[0002] Various equipment is installed in the pit, which is the lowest part of the elevator shaft. Inspection and maintenance work is performed on this equipment as needed. Normally, when workers work in the pit, they switch to maintenance mode to prevent the car from moving unintentionally. This prevents the car from coming into contact with the worker, allowing the worker to work safely in the pit.

[0003] However, there is a possibility that the worker may forget to switch to the maintenance mode. Therefore, it is important to ensure the safety of the worker even if the worker forgets to switch to the maintenance mode. Patent Document 1 discloses a method of providing a sensor that detects a load on a ladder used by the worker to enter and exit the pit. In this method, when the worker steps onto the ladder to enter the pit, the sensor is activated, and it is possible to detect the presence or absence of the worker in the pit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-230920 A Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, even if a worker forgets to switch to the maintenance mode, it is an important issue to ensure the safety of the worker. In addition, when working in a pit, it may be necessary to move the car downward within a range where the car does not come into contact with the worker. The method disclosed in Patent Document 1 cannot detect the position and height of the worker in the pit. Therefore, it is difficult to move the car downward within a range where the car does not come into contact with the worker according to the worker's posture, etc. [Means for solving the problem]

[0006] The elevator operation control system of the present invention is an elevator operation control system having a car arranged to be movable vertically within a hoistway, and comprises a transmitter carried by a worker working at the bottom of the hoistway and transmitting a detection signal, at least one receiver arranged in the car and receiving the detection signal from the transmitter, and a control device that controls the operation of the car, wherein the car has a front curtain extending downward from the lower part of the entrance / exit side of the car, at least one of the receivers is arranged in the front curtain, and the control device stops the movement of the car when the receiver receives the detection signal transmitted from the transmitter.

[0007] By controlling the movement of the car using the detection signal from the transmitter, even if the worker forgets to switch to maintenance mode, the car is prevented from coming into contact with the worker, and the worker can work safely in the pit. In addition, since the worker carries the transmitter, the position and height of the worker in the pit can be detected. As a result, it becomes easy to move the car downward within a range that does not come into contact with the worker, according to the worker's posture, etc. Furthermore, the receiver that receives the detection signal from the transmitter is disposed on the front curtain provided at the bottom of the car. As a result, when the car approaches the worker, the receiver can receive the detection signal from the transmitter early, and the safety of the worker is ensured.

[0008] In addition, in the elevator operation control system of the present invention, the receiver may include a first receiver having a directional antenna, and the directional direction of the first receiver may be directed downward of the apron.

[0009] As described above, the apron is provided at the bottom of the elevator car on the entrance / exit side. Therefore, when the elevator car approaches a worker in the pit, the apron is the place where the risk of contact with the worker is highest. Therefore, according to this configuration, when a worker is present below the apron, the receiver can receive a detection signal from the transmitter at an early stage, and the safety of the worker is further ensured.

[0010] In addition, in the elevator operation control system of the present invention, the receiver may further include a second receiver, wherein the first receiver is arranged on a apron provided at the bottom of the entrance / exit side of the elevator car, and the second receiver is arranged on the bottom surface of the elevator car opposite the side on which the apron is provided.

[0011] This configuration makes it easy to expand the detection range of the receivers, including the first and second receivers, to cover the entire area of ​​the pit. As a result, the receivers can receive detection signals from the transmitters no matter where the worker is working in the pit, further ensuring the safety of the worker.

[0012] In the elevator operation control system according to the present invention, the second receiver may have an omnidirectional antenna.

[0013] According to this configuration, it becomes easier to expand the detection range of the receivers, including the first receiver and the second receiver, to cover the entire area within the pit.

[0014] In addition, the elevator operation control system of the present invention may be provided with a distance calculation unit that calculates the distance between the transmitter and the receiver based on the detection signal received by the receiver, and the control device may stop the movement of the car when the distance calculated by the distance calculation unit is equal to or less than a predetermined threshold value.

[0015] According to this configuration, when the distance between the worker and the car becomes too close, the movement of the car can be stopped. In other words, when a worker is in the pit and the distance between the worker and the car is sufficiently far, the movement of the car is not stopped. As a result, it becomes easier to move the car downward in accordance with the worker's posture, etc., without coming into contact with the worker, and the elevator inspection and maintenance work can be carried out efficiently.

[0016] In addition, in the elevator operation control system according to the present invention, the transmitter may be mounted on a helmet worn by an operator.

[0017] Normally, workers wear helmets when working in the pit. Therefore, this configuration can prevent workers from working in the pit without carrying a transmitter. As a result, elevator inspection and maintenance work can be carried out while ensuring the safety of workers.

[0018] In addition, the elevator operation control system of the present invention may further include a human presence sensor that detects the presence or absence of a worker working at the bottom of the elevator shaft, and the control device may stop movement of the car when the human presence sensor detects a worker working at the bottom of the elevator shaft and the receiver receives a detection signal transmitted from the transmitter.

[0019] According to this configuration, if the human sensor does not detect a worker in the pit, the control device does not stop the movement of the car even if the receiver receives a detection signal. This allows the car to continue moving if the worker stays somewhere other than the pit (for example, inside the car) and the receiver receives a detection signal. As a result, elevator inspection and maintenance work can be performed efficiently. Effect of the Invention

[0020] According to the elevator operation control system of the present invention, it is possible to ensure the safety of workers working in the pit. In addition, it is possible to move the elevator car downwards in a range that does not come into contact with the worker according to the worker's posture, etc., and it is possible to efficiently carry out elevator inspection and maintenance work. [Brief description of the drawings]

[0021] [Figure 1] 1 is a schematic diagram showing an elevator operation control system according to an embodiment of the present invention; [Diagram 2] 1 is a block diagram showing a configuration of an elevator operation control system according to an embodiment; [Diagram 3] 2 is a flowchart showing an example of a control procedure of an elevator operation control system according to an embodiment. [Figure 4] FIG. 2 is a schematic diagram showing an elevator operation control system according to another embodiment. [Diagram 5] 13 is a flowchart showing an example of a control procedure of an elevator operation control system which is another example of an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of an elevator operation control system according to the present invention will be described in detail with reference to the drawings. The embodiment described below is merely an example, and the present invention is not limited to the following embodiment. In addition, the present invention includes a form obtained by selectively combining multiple embodiments and modified examples described below.

[0023] [First embodiment] The configuration of an elevator operation control system 1 according to a first embodiment will be described in detail with reference to Figures 1 to 3. Figure 1 is a schematic diagram showing the configuration of an elevator operation control system 1 according to the present embodiment, and Figure 2 is a block diagram showing the configuration of an elevator operation control system 1 according to the present embodiment.

[0024] As shown in Fig. 1 and Fig. 2, elevator operation control system 1 includes elevator device 10 and transmitter 50 that constantly transmits a detection signal. Elevator device 10 includes car 20 that moves in elevator shaft 11, and car 20 is provided with receiver 30 that receives a detection signal from transmitter 50. Transmitter 50 is carried by worker W who works in pit 12, which is the lowest part of elevator shaft 11. As will be described in detail later, elevator operation control system 1 is a system that stops operation of elevator device 10 when car 20 moves downward and worker W approaches car 20 while worker W is working in pit 12.

[0025] The elevator device 10 is an elevator facility that transports people, objects, etc. between landings installed on each floor by moving a car 20 inside a hoistway 11. The hoistway 11 is arranged, for example, so as to extend vertically inside a building in which the elevator device 10 is installed. A pit 12 is provided at the bottom of the hoistway 11. The pit 12 is a space below the floor surface of the lowest floor where the elevator device 10 stops.

[0026] In this embodiment, a machine room 13 is provided above the elevator shaft 11. The machine room 13 is provided with a hoist 14 and a control panel 40 that is a control device for the elevator. The control panel 40 controls the hoist 14 based on the operation of a user staying in the car 20 and at the landing, for example, to move the car 20. In addition, the control panel 40 stops the movement of the car 20 when the receiver 30 detects a detection signal from the transmitter 50 and the car 20 and the worker W approach each other.

[0027] The car 20 has, for example, an interior space where a person can get on, and moves in the elevator shaft 11 by being driven by a hoist 14 installed in the machine room 13. The car 20 has a car frame 21 to which a main rope 15 is connected, and a car room 22 supported by the car frame 21. The main rope 15 is wound around the hoist 14, and a counterweight (not shown) is connected to the other end of the main rope 15.

[0028] The car 20 has a car door 23 for opening and closing the entrance. The car door 23 is provided on the front of the car chamber 22, and opens and closes the entrance by sliding horizontally in opposite directions. In addition, a front flap 24 is provided on the lower part of the entrance side of the car chamber 22.

[0029] The front curtain 24 is, for example, a metal plate-like member, and is provided so as to extend downward from the lower part on the entrance / exit side of the car chamber 22. The front curtain 24 is fixed by rivets or the like to a threshold (not shown) provided at the entrance / exit of the car chamber 22. The front curtain 24 is provided across the entire width of the entrance / exit formed by fully opening the car door 23. By providing the front curtain 24 on the car 20, it is possible to prevent foreign objects from falling into the hoistway 11.

[0030] The front curtain 24 may be composed of multiple plate-like members, but in this embodiment, it is composed of one plate-like member. Also, as shown in Fig. 1, the lowest part 24A of the front curtain 24 is located at the lowest part of the car 20. In other words, when a worker W is staying in the pit 12, when the car 20 moves downward and approaches the worker W, the front curtain 24 is the place where the risk of contact with the worker W is highest.

[0031] The receiver 30 has, for example, an omnidirectional antenna capable of receiving signals transmitted from any direction, and receives a detection signal from a transmitter 50 carried by a worker W staying in the pit 12. The receiver 30 is disposed near the lowest part 24A of the apron 24. The receiver 30 has a transmitting unit that transmits wireless signals, and performs wireless communication based on wireless communication standards such as Bluetooth (registered trademark), Wi-Fi (registered trademark), or WiMAX. When the receiver 30 receives a detection signal from the transmitter 50, it transmits the received detection signal to the control panel 40 using the wireless communication. The receiver 30 may also have a function of receiving a wireless signal from the control panel 40.

[0032] The control panel 40 controls the operation of the car 20. In addition, the control panel 40 executes a process to stop the movement of the car 20 when the receiver 30 detects a detection signal from the transmitter 50 and the car 20 approaches the worker W. The control panel 40 is provided in the machine room 13 as described above.

[0033] 2, the control panel 40 includes a detection signal acquisition unit 43 that acquires a detection signal received by the receiver 30, a distance calculation unit 44 that calculates the distance between the receiver 30 and the transmitter 50 based on the acquired detection signal, and an approach determination unit 45 that stops the movement of the car 20 when the distance calculated by the distance calculation unit 44 becomes equal to or less than a predetermined threshold. The control panel 40 includes a memory 41 that stores various setting information, control programs, etc., and a processor 42 that reads out the control programs and executes processing.

[0034] The distance calculation unit 44 may calculate the distance between the receiver 30 and the transmitter 50 in the following manner, for example: Examples of methods include calculating the distance based on the reception strength of the detection signal received by the receiver 30, and calculating the distance based on the time difference between when the transmitter 50 transmits the detection signal and when the receiver 30 receives the detection signal.

[0035] The transmitter 50 is, for example, a beacon terminal. The transmitter 50 has a configuration capable of transmitting a beacon signal in a specific frequency band to the outside as a detection signal. The detection signal may also include information (such as name and work content) about the worker W wearing the transmitter 50.

[0036] In this embodiment, the transmitter 50 is mounted on the top of the helmet 51 of the worker W. Usually, the worker W wears the helmet 51 when working in the pit. Therefore, mounting the transmitter 50 on the helmet 51 can prevent the worker W from working in the pit without carrying the transmitter 50. Also, since the helmet 51 is worn on the head of the worker W, the transmitter 50 is disposed on the top of the worker W. As a result, when the elevator 20 approaches the worker W, the receiver 30 can receive the detection signal from the transmitter 50 at an early stage. Note that the mounting position of the transmitter 50 is not limited to the top of the helmet 51, and may be inside the helmet 51.

[0037] Next, a control procedure of the elevator operation control system 1 of this embodiment will be described with reference to Fig. 3. Fig. 3 is a flowchart showing the control procedure of the elevator operation control system 1, and shows the processing operation of the control panel 40.

[0038] 3, when the elevator car 20 moves downward while the worker W is in the pit 12, the receiver 30 receives a detection signal from the transmitter 50. Then, the receiver 30 transmits the detection signal to the control panel 40, and the detection signal acquisition unit 43 acquires the detection signal from the receiver 30 (Step S1: Yes).

[0039] When the detection signal acquisition unit 43 acquires a detection signal from the receiver 30 (step S1: Yes), the distance calculation unit 44 calculates the distance between the receiver 30 and the transmitter 50 based on the detection signal from the receiver 30 (step S2). Note that in this embodiment, the distance calculation unit 44 calculates the distance between the receiver 30 and the transmitter 50 based on the reception strength of the detection signal received by the receiver 30.

[0040] Next, in step S3, the approach determination unit 45 determines whether the distance between the receiver 30 and the transmitter 50 calculated in step S2 is equal to or less than a predetermined threshold (e.g., 5 m). If the distance between the receiver 30 and the transmitter 50 is equal to or less than the threshold (step S3: Yes), the process proceeds to step S4, where a process of stopping the movement of the car 20 is executed.

[0041] When stopping the movement of the car 20, the moving speed of the car 20 may be gradually reduced, and the car 20 may be completely stopped after being moved within a range where the car 20 does not come into contact with the worker W. On the other hand, if the distance between the receiver 30 and the transmitter 50 is greater than the above threshold value (step S3: No), the process returns to step S1, and the car 20 continues to move.

[0042] As described above, according to the elevator operation control system 1 having the above configuration, when the worker W is working in the pit 12 and the car 20 inadvertently moves downward, bringing the worker W and the car 20 close to each other, the receiver 30 receives a detection signal from the transmitter 50. Then, when the receiver 30 receives the detection signal transmitted from the transmitter 50, the control panel 40 (control device) stops the movement of the car 20. Therefore, even if the worker W forgets to switch to the maintenance mode, the car 20 is prevented from coming into contact with the worker W, and the worker W can work safely in the pit 12.

[0043] In addition, since the transmitter 50 is carried by the worker W, it is possible to detect the height of the worker W in the pit. Therefore, in a case where it is necessary to move the car 20 downward within a range where it does not come into contact with the worker W, it is possible to move the car 20 downward within a range where it does not come into contact with the worker W in accordance with the posture of the worker W, etc. In more detail, for example, when the worker W is standing, the car 20 can be stopped higher, and when the worker W is sitting, the car 20 can be stopped lower.

[0044] [Second embodiment] The configuration of an elevator operation control system 1X according to the second embodiment will be described in detail with reference to Fig. 4 and Fig. 5. Fig. 4 is a schematic diagram showing the configuration of an elevator operation control system 1X according to the present embodiment. In the following, the same reference numerals are used for configurations common to the first embodiment, and duplicated explanations are omitted, and differences from the first embodiment will be mainly described.

[0045] As shown in FIG. 4, the second embodiment differs from the first embodiment in that a receiver 30 includes a first receiver 31 having a directional antenna and a second receiver 32 having an omnidirectional antenna.

[0046] The first receiver 31 is disposed near the bottom 24A of the front curtain 24. The second receiver 32 is disposed on the bottom of the car chamber 22 on the side opposite to the side on which the front curtain 24 is provided. The side opposite to the side on which the front curtain 24 is provided means the side rearward of the center of the bottom of the car chamber 22 (the side opposite to the entrance / exit side). By disposing the first receiver 31 and the second receiver 32 far apart, it becomes easy to expand the detection range of the receiver 30 to the entire area inside the pit 12. The location of the second receiver 32 is not limited to this. The second receiver 32 may be disposed on the front curtain 24, for example.

[0047] The first receiver 31 and the second receiver 32 each have a transmitter that transmits a wireless signal, and perform wireless communication based on a wireless communication standard such as Bluetooth (registered trademark), Wi-Fi (registered trademark), or WiMAX. When the first receiver 31 and the second receiver 32 receive a detection signal from the transmitter 50, they transmit the received detection signal to the control board 40 using the wireless communication. The first receiver 31 and the second receiver 32 may also have a function of receiving a wireless signal from the control board 40.

[0048] The first receiver 31 has a directional antenna that shows relatively high sensitivity only in one direction. The direction of the first receiver 31 is directed downwards from the apron 24. The detection area of ​​the first receiver 31 is sufficient if it can detect the worker W staying below the apron 24, and is, for example, within a radius of 1 m from directly below the apron 24. Thus, the first receiver 31 receives a detection signal from the transmitter 50 only when the worker W stays in a predetermined area below the apron 24.

[0049] The second receiver 32 has an omnidirectional antenna capable of receiving a signal transmitted from any direction. That is, the second receiver 32 receives a detection signal transmitted from any position in the pit 12. By using the first receiver 31 and the second receiver 32 in combination, it becomes easy to determine whether the worker W is present under the apron 24, in addition to determining whether the worker W is present in the pit 12.

[0050] Next, a control procedure of the elevator operation control system 1X of this embodiment will be described with reference to Fig. 5. Fig. 5 is a flowchart showing the control procedure of the elevator operation control system 1X, and shows the processing operation of the control panel 40.

[0051] As shown in Fig. 5, when a worker W is positioned below the apron 24 in the pit, the first receiver 31 receives a detection signal from the transmitter 50. The first receiver 31 then transmits the detection signal to the control panel 40, and the detection signal acquisition unit 43 acquires the detection signal from the first receiver 31 (step S11: Yes). On the other hand, if the worker W is not positioned below the apron 24 and the detection signal acquisition unit 43 does not acquire a detection signal from the first receiver 31 (step S11: No), the process proceeds to step S15, and the presence or absence of a detection signal from the second receiver 32 is confirmed.

[0052] When the detection signal acquisition unit 43 acquires a detection signal from the first receiver 31 (step S11: Yes), the distance calculation unit 44 calculates the distance between the first receiver 31 and the transmitter 50 based on the detection signal from the first receiver 31 (step S12). Note that in this embodiment, the distance calculation unit 44 calculates the distance between the first receiver 31 and the transmitter 50 based on the reception strength of the detection signal received by the first receiver 31.

[0053] Next, in step S13, the approach determination unit 45 determines whether the distance between the first receiver 31 and the transmitter 50 calculated in step S12 is equal to or less than a first threshold value (e.g., 5 m). If the distance between the first receiver 31 and the transmitter 50 is equal to or less than the first threshold value (step S13: Yes), the process proceeds to step S14, and a process of stopping the movement of the car 20 is executed.

[0054] On the other hand, if the distance between the first receiver 31 and the transmitter 50 is greater than the first threshold value (step S13: No), the process returns to step S11, and the car 20 continues to move.

[0055] Furthermore, if the worker W is not under the apron 24 and the detection signal acquisition unit 43 does not acquire a detection signal from the first receiver 31 (step S11: No), the detection signal acquisition unit 43 checks whether or not there is a detection signal from the second receiver 32 (step S15). If the detection signal acquisition unit 43 acquires a detection signal from the second receiver 32 (step S15: Yes), that is, if the worker W is staying in a place other than under the apron 24 in the pit, the distance calculation unit 44 calculates the distance between the second receiver 32 and the transmitter 50 based on the detection signal from the second receiver 32 (step S16).

[0056] Next, in step S17, the approach determination unit 45 determines whether or not the distance between the second receiver 32 and the transmitter 50 calculated in step S16 is equal to or less than a second threshold (for example, 10 m). Here, the second threshold may be the same as or different from the first threshold.

[0057] If the distance between the second receiver 32 and the transmitter 50 is equal to or less than the second threshold (step S17: Yes), the process proceeds to step S14, and a process is executed to stop the movement of the car 20. On the other hand, if the distance between the second receiver 32 and the transmitter 50 is greater than the second threshold (step S13: No) in step S17, the process returns to step S11, and the movement of the car 20 is continued.

[0058] It should be noted that the present invention is not limited to the above-described embodiment and its modified examples, and various changes and modifications are possible within the scope of the claims of this application.

[0059] For example, in the above embodiment, the distance between the receiver 30 and the transmitter 50 is calculated, and when the distance becomes equal to or less than a predetermined threshold, the movement of the car 20 is stopped, but this is not limited thereto. For example, the movement of the car 20 may be stopped at the same time that the receiver 30 receives a detection signal from the transmitter 50. In this case, the distance between the receiver 30 and the transmitter 50 when the car 20 is stopped can be adjusted by adjusting the propagation distance of the detection signal transmitted from the transmitter 50. Note that the propagation distance of the detection signal can be adjusted, for example, by changing the frequency of the detection signal.

[0060] In the above embodiment, the second receiver 32 has an omnidirectional antenna, but the second receiver 32 may have a directional antenna. In that case, the direction of the second receiver 32 is directed downward toward the car 20. In addition, the detection area of ​​the second receiver 32 preferably covers almost the entire area inside the pit.

[0061] In the above embodiment, the distance calculation unit 44 and the approach determination unit 45 are provided in the control panel 40, but the present invention is not limited to this. For example, the distance calculation unit 44 and the approach determination unit 45 may be provided in the receiver 30. Furthermore, the distance calculation unit 44 and the approach determination unit 45 may be provided in different devices.

[0062] The elevator operation control system 1, 1X may also include a human sensor that detects the worker W in the pit 12. Examples of the human sensor include elements that detect infrared rays, ultrasonic waves, microwaves, or visible light. The elevator operation control system 1, 1X may also stop the movement of the car 20 based on the detection signal only when the human sensor detects the worker W in the pit 12. In other words, when the human sensor does not detect the worker W in the pit 12, the movement of the car 20 may not be stopped even if the receiver 30 receives a detection signal. This allows the movement of the car 20 to continue when the receiver 30 receives a detection signal due to the worker W staying in a place other than the pit 12 (for example, inside the car room 22). As a result, the elevator maintenance work can be performed efficiently. [Explanation of symbols]

[0063] 1,1X elevator operation control system, 10 elevator device, 11 elevator shaft, 12 pit, 13 machine room, 14 hoist, 15 main rope, 20 car, 21 car frame, 22 car room, 23 car door, 24 front curtain, 24A bottom, 30 receiver, 31 first receiver, 32 second receiver, 40 control panel, 41 memory, 42 processor, 43 detection signal acquisition unit, 44 distance calculation unit, 45 approach determination unit, 50 transmitter, 51 helmet, W worker

Claims

1. An operation control system for an elevator having a car that is arranged to be movable up and down within a hoistway, A transmitter carried by a worker working at the bottom of the elevator shaft and transmitting a detection signal; At least one receiver is provided in the elevator car and receives a detection signal from the transmitter; A control device for controlling the operation of the elevator; Equipped with The car has a front curtain provided so as to extend downward from a lower portion of the entrance / exit side of the car, At least one of the receivers is disposed in the apron; The control device is an elevator operation control system that stops the movement of the car when the receiver receives a detection signal transmitted from the transmitter.

2. The receiver includes a first receiver having a directional antenna; The elevator operation control system according to claim 1 , wherein the first receiver is directed downward from the front curtain.

3. The receiver further includes a second receiver; The first receiver is disposed on the front panel, 3. The elevator operation control system according to claim 2, wherein the second receiver is arranged on a bottom surface of the car opposite to a side on which the front curtain is provided.

4. The elevator operation control system according to claim 3 , wherein the second receiver has an omnidirectional antenna.

5. a distance calculation unit that calculates a distance between the transmitter and the receiver based on the detection signal received by the receiver, The elevator operation control system according to any one of claims 1 to 4, wherein the control device stops movement of the car when the distance calculated by the distance calculation unit is equal to or less than a predetermined threshold value.

6. 5. The elevator operation control system according to claim 1, wherein the transmitter is mounted on a helmet worn by the worker.

7. Further comprising a human presence sensor for detecting the presence or absence of a worker working at the bottom of the elevator shaft, The elevator operation control system according to any one of claims 1 to 4, wherein the control device stops movement of the car when the human presence sensor detects a worker working at the bottom of the elevator shaft and the receiver receives a detection signal transmitted from the transmitter.

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