Elevator control system and elevator control method

Abstract

To provide an elevator control system and an elevator control method capable of suppressing contact between a worker on the upper surface of the ceiling of a car and elevator components. [Solution] The elevator control system includes a detection unit, a determination unit, and a control unit. The detection unit detects a worker working on the ceiling of the elevator car. When the determination unit receives an instruction from the worker to operate the car, it determines whether the car can be raised or lowered based on the position of the worker detected by the detection unit. The control unit controls the raising or lowering of the car based on the result of the determination by the determination unit.

Description

[Technical Field]

[0001] FIELD OF THE INVENTION The present invention relates to an elevator control system and an elevator control method. [Background technology]

[0002] During elevator maintenance and inspection, workers must check the main ropes, roller guides, etc. while standing on the ceiling of the elevator car.

[0003] However, during elevator maintenance and inspection, there is a concern that workers on the upper surface of the car's ceiling may come into contact with rotating or moving parts on the car, and that workers may come into contact with hoistway furniture when passing the car and the hoistway furniture outside the car. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5962416 Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments aim to provide an elevator control system and an elevator control method that can prevent contact between a worker on the upper surface of the ceiling of a car and elevator components. [Means for solving the problem]

[0006] An elevator control system according to an embodiment includes a detection unit, a determination unit, and a control unit. The detection unit detects a worker performing work on the upper surface of the ceiling of the elevator car. When the determination unit receives an instruction to operate the car from the worker, it determines whether the car can be raised or lowered based on the position of the worker detected by the detection unit. The control unit controls the raising or lowering of the car based on the result of the determination by the determination unit. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of an elevator apparatus equipped with an elevator control system according to a first embodiment. [Figure 2] FIG. 2 is a plan view showing a car of the elevator apparatus shown in FIG. [Figure 3] FIG. 3 is a perspective view showing the configuration on the ceiling upper surface of the car shown in FIG. [Figure 4] FIG. 4 is a block diagram showing an elevator control system according to the first embodiment. [Figure 5] FIG. 5 is a flowchart showing an example of the operation of the elevator control system according to the first embodiment. [Figure 6] FIG. 6 is a flowchart showing the details of the process of determining whether the elevator car can be raised or lowered in the flowchart of FIG. [Figure 7] FIG. 7 is a block diagram showing an elevator control system according to a first modified example of the first embodiment. [Figure 8] FIG. 8 is a flowchart showing an example of the operation of the elevator control system according to the first modified example of the first embodiment. [Figure 9] FIG. 9 is a perspective view showing a configuration on the upper surface of the ceiling of a car in an elevator apparatus equipped with an elevator control system according to the second modified example of the first embodiment. [Figure 10] FIG. 10 is a block diagram showing an elevator control system according to a second modification of the first embodiment. [Figure 11] FIG. 11 is a flowchart showing an example of the operation of the elevator control system according to the second modified example of the first embodiment. [Figure 12] FIG. 12 is a plan view showing a car of an elevator apparatus equipped with an elevator control system according to the third modified example of the first embodiment. [Figure 13]FIG. 13 is a flowchart showing an example of the operation of the elevator control system according to the third modified example of the first embodiment. [Figure 14] FIG. 14 is a perspective view showing the configuration on the upper surface of the ceiling of a car in an elevator apparatus equipped with an elevator control system according to the second embodiment. [Figure 15] FIG. 15 is a block diagram showing an elevator control system according to the second embodiment. [Figure 16] FIG. 16 is a flowchart showing an example of the operation of the elevator control system according to the second embodiment. [Figure 17] FIG. 17 is a perspective view showing the configuration on the upper surface of the ceiling of a car in an elevator apparatus equipped with an elevator control system according to the third embodiment. [Figure 18] FIG. 18 is a block diagram showing an elevator control system according to the third embodiment. [Figure 19] FIG. 19 is a flowchart showing an example of the operation of the elevator control system according to the third embodiment. [Figure 20] FIG. 20 is a flowchart showing an example of the operation of the elevator control system according to the modified example of the third embodiment. [Figure 21] FIG. 21 is a block diagram showing an elevator control system according to the fourth embodiment. [Figure 22] FIG. 22 is a flowchart showing an example of the operation of the elevator control system according to the fourth embodiment. [Figure 23] FIG. 23 is a diagram showing a schematic configuration of an elevator apparatus equipped with an elevator control system according to the fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to these embodiments. In addition, in the drawings referred to in the embodiments, identical or similar reference numerals are used to designate identical parts or parts having similar functions, and repeated description thereof will be omitted.

[0009] (First embodiment) As shown in FIG. 1 , an elevator control system 10 is installed in an elevator apparatus 1 and can be used, for example, by an operator to perform maintenance and inspection work on the elevator apparatus 1. The elevator apparatus 1 includes a car 3 that can ascend and descend within a hoistway 2 and a counterweight 4 connected to the car 3 via a main rope 5. The main rope 5 is wound around a main sheave 6a and a deflector sheave 7 provided on a hoisting machine 6. The hoisting machine 6 winds up the main rope 5, causing the car 3 and the counterweight 4 to ascend and descend. In the example shown in FIG. 1 , the hoisting machine 6 is disposed above the hoistway 2. As shown in a fifth embodiment described later, the hoisting machine 6 may be disposed in a machine room above the hoistway 2. A compensating rope 8 connects the lower part of the car 3 to the lower part of the counterweight 4. The compensating rope 8 corrects the imbalance between the weight applied to the main rope 5 on the car 3 side and the weight applied to the main rope 5 on the counterweight 4 side. The compensating rope 8 is wound around the compensating sheave 9 .

[0010] The elevator control system 10 includes a first control panel 40 arranged in the hoistway 2 and a load sensor 21 arranged on the ceiling upper surface 31 of the car 3. The first control panel 40 and the equipment mounted on the car 3 are electrically connected via a tail cord 11. The first control panel 40 and the hoisting machine 6 are electrically connected via wiring (not shown). The first control panel 40 controls the driving of the hoisting machine 6 to control the lifting and lowering operation of the car 3. The first control panel 40 also controls the opening and closing of the door of the car 3. The first control panel 40 may be arranged in a machine room. The load sensor 21 is used to detect a worker on the ceiling upper surface 31 of the car 3. The first control panel 40 controls the lifting and lowering operation of the car 3 based on the position of the worker detected using the load sensor 21.

[0011] As shown in Fig. 2, a car frame 32, handrails 33, and an upper beam 34 are provided on the ceiling upper surface 31 of the car 3. A second control panel 30 is provided on the side of the upper beam 34. The second control panel 30 is used, for example, to detect the load acting on the floor surface based on a detection signal from a load sensor (not shown) provided on the floor surface inside the car 3. To enable workers to work on the ceiling upper surface 31, which is normally a dark place, a lighting device that illuminates the surroundings may be provided on the ceiling upper surface 31.

[0012] The ceiling upper surface 31 has a departure prevention position 311. The departure prevention position 311 is a working position that prevents the worker's body from departing outside of a projection area R formed by projecting the ceiling upper surface 31 in the ascending / descending direction of the car 3. The departure prevention position 311 can also be called a safety position. By positioning the worker at the departure prevention position 311, the worker can prevent the worker's body (e.g., hands or feet) from departing outside of the projection area R (i.e., protruding beyond the projection area R). Note that FIG. 2 shows a plan view of the projection area R as seen from the ascending / descending direction of the car 3. In the example shown in FIG. 2, the departure prevention position 311 is any position on the ceiling upper surface 31 within the range surrounded by a frame F.

[0013] The load sensor 21 is disposed at the departure prevention position 311. The load sensor 21 detects a load acting on the departure prevention position 311. Specifically, the load sensor 21 outputs a detection signal corresponding to the load acting on the departure prevention position 311. The detection signal output from the load sensor 21 is input to the first control panel 40.

[0014] In the example shown in FIG. 2 , two load sensors 21 are arranged at the departure prevention positions 311. Specifically, the two load sensors 21 are arranged diagonally on the ceiling upper surface 31, sandwiching the upper beam 34. More specifically, the load sensors 21 have a human footprint. The fact that the load sensors 21 have a human footprint can be visually recognized from the outside, for example, by a color or marking applied to the load sensors 21. By having the load sensors 21 have a human footprint, a worker can intuitively grasp the position where the worker should stay when raising or lowering the car 3 along the elevator shaft 2. Note that the load sensors 21 do not necessarily have to have a footprint. For example, the load sensors 21 may be arranged across all of the departure prevention positions 311. The load sensors 21 may be, for example, piezoelectric or strain gauge sensors.

[0015] A pair of guide rails 12 are provided in the hoistway 2 to guide the elevator car 3 as it ascends and descends along the hoistway 2. A pair of guide rails (not shown) are also provided in the hoistway 2 to guide the counterweight 4 as it ascends and descends.

[0016] As shown in FIG. 3, a worker O on the ceiling upper surface 31 can transmit operation instructions to the first control panel 40 using a remote control (not shown) while positioned on the load sensor 21. By transmitting the operation instructions, the car 3 can be raised or lowered. As shown in FIG. 3, the elevator device 1 includes a roller guide 13 that rolls on the guide rail 12, a rope hitch unit 14 that secures one end of the main rope 5 to the car 3, and a guide shoe 15 that guides the car 3 along the guide rail 12. The roller guide 13 rolls on the guide rail 12, causing the car 3 to rise and fall along the guide rail 12. Note that the roller guide 13 is also provided on the counterweight 4 side so as to roll on the guide rail on the counterweight 4 side. The other end of the main rope 5 is fixed to a rope hitch unit (not shown) on the counterweight 4 side.

[0017] The configuration of the elevator control system 10 will be described in further detail. As shown in Fig. 4, the elevator control system 10 includes a detection unit 20, a determination unit 42, and a control unit 43. The detection unit 20 detects a worker performing work on the ceiling upper surface 31. The detection unit 20 includes the load sensor 21 and the detection processing unit 41 described above. Note that Fig. 4 representatively illustrates only one load sensor 21. The detection processing unit 41, the determination unit 42, and the control unit 43 are provided in the first control panel 40. However, the configuration is not limited to this, and the detection processing unit 41 may be provided in the second control panel 30 described above.

[0018] The load sensor 21 outputs a detection signal corresponding to the load acting on the departure prevention position 311 to the detection processing unit 41. The detection processing unit 41 calculates the load acting on the departure prevention position 311 based on the detection signal input from the load sensor 21. The detection processing unit 41 detects a worker at the departure prevention position 311 based on the fact that the calculated load indicates a load distribution of a human footprint.

[0019] When receiving an instruction from the worker to operate the car 3, the determination unit 42 determines whether the car 3 can be raised or lowered based on the position of the worker detected by the detection unit 20. The determination unit 42 determines that the car 3 can be raised or lowered in response to the detection unit 20 detecting a worker at the departure prevention position 311. Furthermore, the determination unit 42 determines that the car 3 cannot be raised or lowered in response to the detection unit 20 not detecting a worker at the departure prevention position 311.

[0020] The control unit 43 controls the elevation and lowering of the car 3 based on the result of the judgment by the judgment unit 42. When the judgment unit 42 judges that the car 3 can be elevated or lowered, the control unit 43 raises or lowers the car 3 by driving the hoist 6. When the judgment unit 42 judges that the car 3 cannot be elevated or lowered, the control unit 43 does not raise or lower the car 3 by not driving the hoist 6. In other words, the control unit 43 maintains the stopped state of the car 3.

[0021] Next, an example of the operation of the above-mentioned elevator control system 10 will be described. As shown in Fig. 5, first, the determination unit 42 determines whether the car-top inspection mode is set and whether an instruction to operate the car 3 has been given by a worker on the ceiling upper surface 31 via remote control (step S1). The car-top inspection mode is an operation mode of the car 3 when a worker inspects the elevator device 1 on the ceiling upper surface 31.

[0022] If an instruction to operate the car 3 has been issued in the on-car inspection mode (step S1: Yes), the judgment unit 42 determines whether the car 3 can be raised or lowered (step S2). On the other hand, if an instruction to operate the car 3 has not been issued in the on-car inspection mode (step S1: No), the elevator control system 10 repeatedly determines whether an instruction to operate the car 3 has been issued in the on-car inspection mode (step S1).

[0023] To describe in more detail the determination of whether the car 3 can be raised or lowered (step S2), as shown in FIG. 6, first, the detection processing unit 41 acquires a detection signal from the load sensor 21 (step S21).

[0024] After acquiring the detection signal of the load sensor 21, the detection processing unit 41 calculates the load acting on the departure prevention position 311 based on the acquired detection signal of the load sensor 21 (step S22).

[0025] After calculating the load acting on the departure prevention position 311, the detection processing unit 41 determines whether or not the calculated load acting on the departure prevention position 311 shows the load distribution of a human footprint (step S23).

[0026] If the calculated load acting on the departure prevention position 311 shows a load distribution of a human footprint (step S23: Yes), the detection processing unit 41 determines that a worker has been detected at the departure prevention position 311 (step S24). On the other hand, if the calculated load does not show a load distribution of a human footprint (step S23: No), the detection processing unit 41 determines that a worker has not been detected at the departure prevention position 311 (step S25).

[0027] After the worker is detected at the departure prevention position 311, the determination unit 42 determines that the elevator car 3 can be raised or lowered (step S2: Yes).

[0028] On the other hand, after the worker is not detected at the departure prevention position 311, the determination unit 42 determines that the elevator car 3 cannot be raised or lowered (step S2: No).

[0029] If the elevator car 3 can be raised or lowered (step S2: Yes), as shown in Fig. 5, the control unit 43 raises or lowers the elevator car 3 in accordance with the operation instruction (step S3). Note that if the detection processing unit 41 detects that the worker has moved from the deviation prevention position 311 while the elevator car 3 is being raised or lowered, the first control panel 40 may output an alarm sound from the worker's remote control or another alarm device. In this case, the control unit 43 may gradually decelerate and stop the elevator car 3.

[0030] On the other hand, if the elevator car 3 cannot be raised or lowered (step S2: No), the control unit 43 maintains the stopped state of the elevator car 3 (step S4).

[0031] As described above, according to the elevator control system 10 of the first embodiment, the detection unit 20 detects a worker performing work on the ceiling upper surface 31 of the car 3 of the elevator apparatus 1. Furthermore, when the determination unit 42 receives an instruction to operate the car 3 from the worker, it determines whether or not the car 3 can be raised or lowered based on the position of the worker detected by the detection unit 20. Furthermore, the control unit 43 controls the raising or lowering of the car 3 based on the result of the determination by the determination unit 42. This makes it possible to control whether or not the car 3 can be raised or lowered depending on the position of the worker on the ceiling upper surface 31, thereby preventing contact between the worker on the ceiling upper surface 31 and components of the elevator apparatus 1.

[0032] Furthermore, according to the elevator control system 10 of the first embodiment, the ceiling upper surface 31 has a deviation prevention position 311 that prevents the worker's body from deviating outside of a projection area R obtained by projecting the ceiling upper surface 31 in the ascending / descending direction of the car 3. Furthermore, the determination unit 42 determines that the car 3 can ascend or descend in response to the detection of a worker at the deviation prevention position 311 by the detection unit 20. This allows the car 3 to ascend or descend when a worker is detected at the deviation prevention position 311, thereby simply and appropriately preventing contact between the worker on the ceiling upper surface 31 and the components of the elevator apparatus 1.

[0033] Furthermore, according to the elevator control system 10 of the first embodiment, the detection unit 20 has at least one load sensor 21 that detects a load acting on the deviation prevention position 311, and detects a worker at the deviation prevention position 311 based on the load detected by the load sensor 21 indicating the load distribution of a human footprint. This allows for simple and appropriate detection of a worker at the deviation prevention position 311. It is also possible that a worker may place baggage on the load sensor 21 and position themselves at a location other than the load sensor 21. In this case, however, the load detected by the load sensor 21 does not indicate the load distribution of a human footprint, and therefore the worker is not detected at the deviation prevention position 311. Since the worker is not detected at the deviation prevention position 311, the elevator car 3 is not permitted to ascend or descend. Therefore, by using the load sensor 21 to detect a worker based on the load distribution of a human footprint, it is also possible to prevent fraudulent elevation control.

[0034] (First Modification) Next, a first modified example of the first embodiment that limits the number of workers on the ceiling upper surface 31 will be described, focusing on the differences from the above-described embodiment. As shown in Fig. 7, the elevator control system 10 according to the first modified example of the first embodiment further includes a number of workers sensor 22 in addition to the configuration shown in Fig. 4.

[0035] The number of people sensor 22 is a component of the detection unit 20. The number of people sensor 22 outputs a detection signal corresponding to the number of workers on the ceiling upper surface 31 to the detection processing unit 41. The number of people sensor 22 is, for example, a camera that captures an image of an imaging area on the ceiling upper surface 31 and outputs an image signal as a detection signal. The number of people sensor 22 may include a thermosensor instead of or in addition to the camera. The thermosensor detects the temperature of the sensing area on the ceiling upper surface 31 and outputs a temperature signal as a detection signal. The detection processing unit 41 detects the number of workers on the ceiling upper surface 31 based on the detection signal from the number of people sensor 22. If the number of workers detected by the detection processing unit 41 is equal to or less than a set number, the determination unit 42 determines whether the car 3 can ascend or descend based on the positions of the workers. The set number may be, for example, two, but is not limited to this. On the other hand, if the number of workers detected by the detection processing unit 41 is not equal to or less than the set number, the determination unit 42 makes an announcement to reduce the number of workers to the set number or less. The announcement is made, for example, via a remote control carried by a worker on the ceiling upper surface 31.

[0036] Next, we will explain an example of the operation of the elevator control system 10 shown in Fig. 7. As shown in Fig. 8, when an instruction to operate the car 3 is given in the on-car inspection mode (step S1: Yes), the detection processing unit 41 acquires a detection signal from the people sensor 22 (step S5).

[0037] After acquiring the detection signal of the number of people sensor 22, the detection processing unit 41 calculates the number of workers on the ceiling upper surface 31 of the car 3 based on the acquired detection signal of the number of people sensor 22 (step S6).

[0038] After the number of workers on the ceiling upper surface 31 is calculated, the determination unit 42 determines whether or not the number of workers on the ceiling upper surface 31 is two or less (step S7).

[0039] If the number of workers on the ceiling upper surface 31 is two or less (step S7: Yes), the judgment unit 42 judges whether the car 3 can be raised or lowered (step S2). On the other hand, if the number of workers on the ceiling upper surface 31 is more than two (step S7: No), the judgment unit 42 makes an announcement to reduce the number of workers on the ceiling upper surface 31 to two or less (step S8). After the announcement is made, the detection processing unit 41 repeatedly acquires the detection signal of the number of people sensor 22 (step S5). Note that the detection unit 20 may limit the number of load sensors 21 to be driven depending on the number of workers on the ceiling upper surface 31 calculated using the number of people sensor 22.

[0040] As described above, according to the elevator control system 10 of the first modified example of the first embodiment, the number of people sensor 22 detects the number of workers on the ceiling upper surface 31. When the number of people detected by the number of people sensor 22 is equal to or less than a set number, the determination unit 42 determines whether or not the car 3 can ascend or descend based on the positions of the workers. This makes it possible to limit the number of workers on the ceiling upper surface 31, thereby more effectively preventing contact between the workers on the ceiling upper surface 31 and the components of the elevator apparatus 1.

[0041] (Second Modification) Next, a second modification of the first embodiment having a second load sensor above the departure prevention position 311 will be described, focusing on the differences from the above-described embodiment. In the example shown in FIG. 9, the elevator control system 10 further includes a second load sensor 23 in addition to the configuration shown in FIG. 2. The second load sensor 23 detects a load acting on a designated position that designates the position of a part of the worker's body (e.g., a hand) on the departure prevention position 311. The designated position is a position that allows the worker on the departure prevention position 311 to assume a suitable posture to more effectively prevent departure from the projection area R. In the example shown in FIG. 9, the designated position is a position on the side surface of the upper beam 34 where the worker should place his or her hand. Specifically, the designated position is a position on the side surface of the upper beam 34. That is, the second load sensor 23 is disposed at the designated position on the side surface of the upper beam 34. Note that the designated position may be a position other than a position on the side surface of the upper beam 34 as long as it can enhance the effect of preventing the worker from departing from the projection area R. In the example shown in FIG. 9, the second load sensor 23 has a human handprint. The fact that the second load sensor 23 has a human handprint can be visually recognized from the outside, for example, by a color or marking applied to the second load sensor 23. The second load sensor 23 having a human handprint allows a worker to intuitively grasp the designated position. Note that the second load sensor 23 does not necessarily have to have a handprint. The detection method of the second load sensor 23 may be the same as or different from that of the load sensor 21.

[0042] 10, the second load sensor 23 is a component of the detection unit 20. The second load sensor 23 outputs a detection signal corresponding to the load acting on the designated position to the detection processing unit 41. The detection processing unit 41 calculates the load acting on the designated position based on the detection signal input from the second load sensor 23.

[0043] The detection processing unit 41 detects a worker at the deviation prevention position 311 based on the fact that the load calculated based on the detection signal of the load sensor 21 indicates the load distribution of a human footprint and that the load calculated based on the detection signal of the second load sensor 23 indicates the load distribution of a human hand.

[0044] Next, an operation example of the elevator control system 10 shown in Fig. 9 and Fig. 10 will be described. As shown in Fig. 11, when the load acting on the deviation prevention position 311 calculated based on the detection signal of the load sensor 21 shows a load distribution of a human footprint (step S23: Yes), the detection processing unit 41 acquires the detection signal of the second load sensor 23 (step S26).

[0045] After acquiring the detection signal of the second load sensor 23, the detection processing unit 41 calculates the load acting on the specified position based on the acquired detection signal of the second load sensor 23 (step S27).

[0046] After calculating the load acting on the designated position, the detection processing unit 41 determines whether the calculated load acting on the designated position shows the load distribution of a human hand (step S28).

[0047] If the calculated load acting on the designated position shows a load distribution of a human hand (step S28: Yes), the detection processing unit 41 determines that a worker has been detected at the deviation prevention position 311 (step S24). On the other hand, if the calculated load acting on the designated position does not show a load distribution of a human hand (step S28: No), the detection processing unit 41 determines that a worker has not been detected at the deviation prevention position 311 (step S25).

[0048] As described above, according to the elevator control system 10 of the second modified example of the first embodiment, the detection unit 20 detects a worker at the deviation suppression position 311 when the load detected by the load sensor 21 indicates a load distribution of a human footprint and the load detected by the second load sensor 23 indicates a load distribution of a human handprint (i.e., the shape of a part of the body). This allows the car 3 to ascend and descend in a state where deviation of the worker from the projection area R is more appropriately suppressed, thereby more effectively suppressing contact between the worker on the ceiling upper surface 31 and the components of the elevator apparatus 1.

[0049] (Third Modification) Next, a third modification of the first embodiment in which the load sensor 21 is arranged at a position other than the departure prevention position 311 will be described, focusing on the differences from the above-described embodiment. In the example shown in Fig. 12, the load sensor 21 is arranged at a position other than the departure prevention position 311. That is, the load sensor 21 is arranged at a position where departure of the worker's body outside the projection area R is not prevented. In other words, the load sensor 21 is arranged at a position where there is a high possibility that the worker's body will depart outside the projection area R. More specifically, in the example shown in Fig. 12, the load sensor 21 is arranged on the outer periphery of the ceiling upper surface 31.

[0050] 12, the load sensor 21 outputs a detection signal corresponding to a load acting on a position other than the departure prevention position 311 to the detection processing unit 41. The detection processing unit 41 calculates the load acting on a position other than the departure prevention position 311 based on the detection signal input from the load sensor 21. The detection processing unit 41 detects a worker at a position other than the departure prevention position 311 based on the fact that the calculated load indicates the load distribution of a human footprint.

[0051] The judgment unit 42 judges that the elevator car 3 cannot be raised or lowered in response to the detection processing unit 41 detecting an operator at a position other than the departure prevention position 311. Furthermore, the judgment unit 42 judges that the elevator car 3 can be raised or lowered in response to the detection processing unit 41 not detecting an operator at a position other than the departure prevention position 311.

[0052] Next, an example of the operation of the elevator control system 10 shown in Fig. 12 will be described. As shown in Fig. 13, if the load acting on a position other than the deviation prevention position 311 calculated based on the detection signal of the load sensor 21 does not show a load distribution of a human footprint (step S23: No), the detection processing unit 41 determines that no worker has been detected at a position other than the deviation prevention position 311 (step S29). Note that the calculated load not showing a load distribution of a human footprint also includes a case where the calculated load is zero. On the other hand, if the load acting on a position other than the deviation prevention position 311 shows a load distribution of a human footprint (step S23: Yes), the detection processing unit 41 determines that a worker has been detected at a position other than the deviation prevention position 311 (step S210).

[0053] After the worker is not detected at any position other than the deviation prevention position 311, the determination unit 42 determines that the elevator car 3 can be raised or lowered (step S2: Yes).

[0054] On the other hand, after the worker is detected at a position other than the departure prevention position 311, the determination unit 42 determines that the elevator car 3 cannot be raised or lowered (step S2: No).

[0055] As described above, according to the elevator control system 10 of the third modified example of the first embodiment, the load sensor 21 detects a load acting at a position other than the departure prevention position 311. The detection unit 20 detects a worker at a position other than the departure prevention position 311 based on the fact that the load detected by the load sensor 21 indicates a load distribution of a human footprint. The determination unit 42 determines that the car 3 can ascend or descend when the detection unit 20 does not detect a worker at a position other than the departure prevention position 311. This makes it possible to prevent contact between the worker on the ceiling upper surface 31 and the components of the elevator apparatus 1, similar to the above-described embodiment. Furthermore, it is possible to improve the degree of freedom in the arrangement position of the load sensor 21.

[0056] (Second embodiment) Next, a second embodiment in which a worker is detected using a multi-optical axis sensor will be described, focusing on the differences from the above-mentioned embodiments. Up to now, an example in which a worker on the ceiling upper surface 31 is detected using a load sensor 21 has been described. In contrast to this, in the example shown in FIG. 14 , the elevator control system 10 detects a worker on the ceiling upper surface 31 using a multi-optical axis sensor 24. The multi-optical axis sensor 24 is a sensor that detects a worker based on the fact that multi-beams such as infrared rays are blocked by the worker. In the example shown in FIG. 14 , two multi-optical axis sensors 24 are provided. The multi-optical axis sensor 24 includes a projector 24a that emits multi-beams and a photoreceiver 24b that receives the multi-beams emitted from the projector 24a. The projector 24a is provided at each of two corners of the substantially rectangular ceiling upper surface 31 so as to extend upward. The light receivers 24b are arranged to extend upward at two corners of the ceiling upper surface 31 different from the corner where the light projector 24a is arranged. The light projector 24a and the light receiver 24b may be provided on the handrail 33. The multi-optical axis sensor 24 having the light projector 24a and the light receiver 24b arranged at the corners on the ceiling upper surface 31 in this manner can sense the area excluding the departure prevention position 311 and optically detect the worker. As long as the area excluding the departure prevention position 311 can be sensed, the positions and numbers of the light projector 24a and the light receiver 24b are not limited to the example shown in FIG. 14 .

[0057] 15, the multiple optical axis sensor 24 (i.e., the optical receiver 24b) outputs a detection signal according to the detection state of the worker at a position other than the deviation prevention position 311 to the detection processing unit 41. Note that only one multiple optical axis sensor 24 is representatively illustrated in FIG. 15. The detection processing unit 41 detects the worker at a position other than the deviation prevention position 311 based on the detection signal input from the multiple optical axis sensor 24.

[0058] The judgment unit 42 judges that the elevator car 3 can be raised or lowered in response to the fact that the detection processing unit 41 has not detected a worker at a position other than the deviation prevention position 311. Furthermore, the judgment unit 42 judges that the elevator car 3 cannot be raised or lowered in response to the fact that the detection processing unit 41 has detected a worker at a position other than the deviation prevention position 311.

[0059] Next, a description will be given of an example of the operation of the elevator control system 10 shown in Fig. 14 and Fig. 15. As shown in Fig. 16, first, the detection processing unit 41 acquires a detection signal from the multi-optical axis sensor 24 (step S211).

[0060] After acquiring the detection signal of the multi-optical axis sensor 24, the detection processing unit 41 determines whether or not a worker has been detected based on the acquired detection signal of the multi-optical axis sensor 24 (step S212).

[0061] If no worker is detected (step S212: No), the detection processing unit 41 determines that no worker is detected at a position other than the departure prevention position 311 (step S29). On the other hand, if a worker is detected (step S212: Yes), the detection processing unit 41 determines that a worker is detected at a position other than the departure prevention position 311 (step S210).

[0062] After the worker is not detected at any position other than the deviation prevention position 311, the determination unit 42 determines that the elevator car 3 can be raised or lowered (step S2: Yes).

[0063] On the other hand, after the worker is detected at a position other than the departure prevention position 311, the determination unit 42 determines that the elevator car 3 cannot be raised or lowered (step S2: No).

[0064] As described above, according to the elevator control system 10 of the second embodiment, the detection unit 20 has at least one multiple optical-axis sensor 24 that senses an area excluding the departure prevention position 311 and optically detects a worker. The detection unit 20 detects a worker at a position other than the departure prevention position 311 based on the detection of a worker by the multiple optical-axis sensor 24. Furthermore, the determination unit 42 determines that the car 3 can be raised or lowered when the detection unit 20 has not detected a worker at a position other than the departure prevention position 311. This allows the car 3 to be permitted to rise or lower when the multiple optical-axis sensor 24 has not detected a worker at a position other than the departure prevention position 311, thereby making it possible to simply and appropriately prevent contact between a worker on the ceiling upper surface 31 and components of the elevator apparatus 1.

[0065] (Third embodiment) Next, a third embodiment in which a worker is detected using a camera will be described, focusing on the differences from the above-described embodiments. Up to now, examples have been described in which a worker on the ceiling upper surface 31 is detected using a load sensor 21 or a multi-beam sensor 24. In contrast, in the example shown in FIG. 17 , the elevator control system 10 detects a worker on the ceiling upper surface 31 using a camera 25. In the example shown in FIG. 17 , a plurality of cameras 25 are disposed distributed on the car frame 32 and the upper beam 34. The plurality of cameras 25 are disposed so as to capture an image of the area including the departure prevention position 311 so as to eliminate blind spots. The positions and number of cameras 25 are not limited to the example shown in FIG. 17 , as long as the area including the departure prevention position 311 can be captured so as to eliminate blind spots. For example, instead of disposing a plurality of cameras 25, a single 360° camera may be disposed.

[0066] In the example shown in Fig. 18, the camera 25 outputs a captured image of an area including the departure prevention position 311 to the detection processing unit 41. Note that Fig. 18 representatively illustrates only one camera 25. The detection processing unit 41 detects a worker at the departure prevention position 311 based on the captured image input from the camera 25.

[0067] The judgment unit 42 judges that the elevator car 3 can be raised or lowered in response to the detection processing unit 41 detecting an operator at the departure prevention position 311. Furthermore, the judgment unit 42 judges that the elevator car 3 cannot be raised or lowered in response to the detection processing unit 41 not detecting an operator at the departure prevention position 311.

[0068] Next, a description will be given of an example of the operation of the elevator control system 10 shown in Figures 17 and 18. As shown in Figure 19, first, the detection processing unit 41 acquires an image captured by the camera 25 (step S213).

[0069] After acquiring the image captured by the camera 25, the detection processing unit 41 determines whether or not a worker has been detected based on the acquired image captured by the camera 25 (step S214).

[0070] If a worker is detected (step S214: Yes), the detection processing unit 41 determines that a worker is detected at the departure prevention position 311 (step S24). On the other hand, if a worker is not detected (step S214: No), the detection processing unit 41 determines that a worker is not detected at the departure prevention position 311 (step S25).

[0071] After the worker is detected at the departure prevention position 311, the determination unit 42 determines that the elevator car 3 can be raised or lowered (step S2: Yes).

[0072] On the other hand, after the worker is not detected at the departure prevention position 311, the determination unit 42 determines that the elevator car 3 cannot be raised or lowered (step S2: No).

[0073] As described above, according to the elevator control system 10 of the third embodiment, the detection unit 20 has at least one camera 25 that captures an image of an area including the departure prevention position 311 and detects a worker based on the captured image. The detection unit 20 detects the worker at the departure prevention position 311 based on the detection of the worker by the camera 25. Furthermore, the determination unit 42 determines that the car 3 can be raised or lowered in response to the detection of the worker at the departure prevention position 311 by the detection unit 20. This allows the car 3 to be permitted to rise or lower when the camera 25 detects a worker at the departure prevention position 311, thereby simply and appropriately preventing contact between the worker on the ceiling upper surface 31 and the components of the elevator apparatus 1.

[0074] (Variation) Next, a modified example of the third embodiment that includes a camera 25 (i.e., a second camera) that captures an image of the area excluding the departure prevention position 311 will be described, focusing on the differences from the above-mentioned embodiment. In this modified example, the camera 25 of the detection unit 20 is positioned to capture an image of the area excluding the departure prevention position 311. The camera 25 outputs the captured image of the area excluding the departure prevention position 311 to the detection processing unit 41. The detection processing unit 41 detects a worker at a position other than the departure prevention position 311 based on the captured image input from the camera 25. The determination unit 42 determines that the elevator car 3 can be raised or lowered when the detection processing unit 41 has not detected a worker at a position other than the departure prevention position 311.

[0075] Next, an example of the operation of the elevator control system 10 of this modified example will be described. As shown in Fig. 20, first, the detection processing unit 41 acquires an image captured by the camera 25 (step S213).

[0076] After acquiring the image captured by the camera 25, the detection processing unit 41 determines whether or not a worker has been detected based on the acquired image captured by the camera 25 (step S214).

[0077] If no worker is detected (step S214: No), the detection processing unit 41 determines that no worker is detected at a position other than the departure prevention position 311 (step S29). On the other hand, if a worker is detected (step S214: Yes), the detection processing unit 41 determines that a worker is detected at a position other than the departure prevention position 311 (step S210).

[0078] After the worker is not detected at any position other than the deviation prevention position 311, the determination unit 42 determines that the elevator car 3 can be raised or lowered (step S2: Yes).

[0079] On the other hand, after the worker is detected at a position other than the departure prevention position 311, the determination unit 42 determines that the elevator car 3 cannot be raised or lowered (step S2: No).

[0080] As described above, according to the elevator control system 10 of the modified example of the third embodiment, the detection unit 20 detects a worker at a position other than the departure prevention position 311 based on the detection of a worker based on an image of the area excluding the departure prevention position 311 captured by the camera 25. Furthermore, the determination unit 42 determines that the car 3 can ascend or descend when the detection unit 20 has not detected a worker at a position other than the departure prevention position 311. This allows the car 3 to ascend or descend when the camera 25 has not detected a worker at a position other than the departure prevention position 311, thereby making it possible to simply and appropriately prevent contact between the worker on the ceiling upper surface 31 and the components of the elevator apparatus 1.

[0081] (Fourth embodiment) Next, a fourth embodiment in which a worker is detected using a load sensor 21, a multi-optical axis sensor 24, and a camera 25 will be described, focusing on the differences from the above-mentioned embodiments. In the example shown in Fig. 21 , the detection unit 20 includes at least one load sensor 21, at least one multi-optical axis sensor 24, and at least one camera 25. The detection processing unit 41 detects a worker at a deviation prevention position 311 based on the fact that the load detected by the load sensor 21 indicates the load distribution of a human footprint and that the camera 25 has detected a worker. Furthermore, the detection processing unit 41 detects a worker at a position other than the deviation prevention position 311 based on the fact that the multi-optical axis sensor 24 has detected a worker.

[0082] The judgment unit 42 judges that the elevator car 3 can be raised or lowered based on the fact that the detection processing unit 41 detects a worker at the deviation prevention position 311 and that the detection processing unit 41 does not detect a worker at any position other than the deviation prevention position 311.

[0083] Next, an example of the operation of the elevator control system 10 of the fourth embodiment will be described. As shown in Fig. 22, first, the detection processing unit 41 acquires a detection signal from the load sensor 21 (step S21).

[0084] After acquiring the detection signal of the load sensor 21, the detection processing unit 41 calculates the load acting on the departure prevention position 311 based on the acquired detection signal of the load sensor 21 (step S22).

[0085] After calculating the load acting on the departure prevention position 311, the detection processing unit 41 determines whether or not the calculated load acting on the departure prevention position 311 shows the load distribution of a human footprint (step S23).

[0086] If the calculated load acting on the departure prevention position 311 indicates the load distribution of a human footprint (step S23: Yes), the detection processing unit 41 acquires an image captured by the camera 25 (step S213). On the other hand, if the calculated load does not indicate the load distribution of a human footprint (step S23: No), the detection processing unit 41 determines that no worker has been detected at the departure prevention position 311 (step S25).

[0087] After acquiring the image captured by the camera 25, the detection processing unit 41 determines whether or not a worker has been detected based on the acquired image captured by the camera 25 (step S214).

[0088] If a worker is detected (step S214: Yes), the detection processing unit 41 determines that a worker has been detected at the departure prevention position 311 (step S24). In other words, the detection processing unit 41 determines that a worker has been detected at the departure prevention position 311 because the worker has been detected by both the load sensor 21 arranged at the departure prevention position 311 and the camera 25 capturing images of the departure prevention position 311. On the other hand, if a worker has not been detected (step S214: No), the detection processing unit 41 determines that a worker has not been detected at the departure prevention position 311 (step S25).

[0089] After the operator is detected at the deviation prevention position 311, the detection processing unit 41 acquires the detection signal of the multi-optical axis sensor 24 (step S211).

[0090] After acquiring the detection signal of the multi-optical axis sensor 24, the detection processing unit 41 determines whether or not a worker has been detected based on the acquired detection signal of the multi-optical axis sensor 24 (step S212).

[0091] If no worker is detected (step S212: No), the detection processing unit 41 determines that no worker is detected at a position other than the departure prevention position 311 (step S29). On the other hand, if a worker is detected (step S212: Yes), the detection processing unit 41 determines that a worker is detected at a position other than the departure prevention position 311 (step S210).

[0092] After the worker is not detected at any position other than the deviation prevention position 311, the determination unit 42 determines that the elevator car 3 can be raised and lowered (step S2: Yes). That is, the determination unit 42 determines that the elevator car 3 can be raised and lowered because the load sensor 21 and the camera 25 detected the worker at the deviation prevention position 311 and the multi-optical axis sensor 24 did not detect the worker at any position other than the deviation prevention position 311.

[0093] On the other hand, after a worker is detected at a position other than the deviation prevention position 311, or after a worker is not detected at the deviation prevention position 311, the judgment unit 42 determines that the elevator 3 cannot be raised or lowered (step S2: No).

[0094] As described above, according to the elevator control system 10 of the fourth embodiment, the detection unit 20 detects a worker at the departure prevention position 311 based on the fact that the load detected by the load sensor 21 indicates the load distribution of a human footprint and that the camera 25 detects a worker. The detection unit 20 also detects a worker at a position other than the departure prevention position 311 based on the fact that the multi-optical axis sensor 24 detects a worker. The determination unit 42 also determines that the car 3 can ascend or descend based on the fact that the detection unit 20 detects a worker at the departure prevention position 311 and that the detection unit 20 has not detected a worker at a position other than the departure prevention position 311. This makes it possible to more reliably prevent contact between the worker on the ceiling upper surface 31 and the components of the elevator apparatus 1.

[0095] (Fifth embodiment) Next, a fifth embodiment in which the elevator apparatus 1 includes a machine room will be described, focusing on the differences from the above-described embodiments. In the example shown in Fig. 23, the hoisting machine 6, the main sheave 6a, and the deflector sheave 7 are arranged in a machine room 17 provided above the hoistway 2. The first control panel 40 may also be arranged in the machine room 17. When the first control panel 40 is arranged in the machine room 17, one end of the tail cord 11 may be connected to a relay box instead of the first control panel 40. The relay box may be connected to the first control panel 40 via a wire or wirelessly.

[0096] According to the fifth embodiment, even in an elevator system 1 having a machine room 17, contact between a worker on the ceiling upper surface 31 and components of the elevator system 1 can be suppressed.

[0097] It should be noted that the configurations described in the above-described respective embodiments and modified examples can be combined as appropriate. For example, the manner in which the detection results of the worker by a plurality of sensors (for example, the load sensor 21, the multi-optical axis sensor 24, and the camera 25) are combined to determine whether the car 3 can be raised or lowered is not limited to the manner shown in Fig. 21 and Fig. 22. Specifically, the detection results of the worker by two sensors out of the load sensor 21, the multi-optical axis sensor 24, and the camera 25 may be combined to determine whether the car 3 can be raised or lowered.

[0098] At least a portion of the elevator control system 10 according to this embodiment may be configured with hardware or software. In the case of a software configuration, a program that realizes at least a portion of the functions of the elevator control system 10 may be stored on a recording medium such as a flexible disk or a CD-ROM and read and executed by a computer. The recording medium is not limited to removable media such as magnetic disks or optical disks, but may also be fixed recording media such as hard disk drives or memory. In addition, a program that realizes at least a portion of the functions of the elevator control system 10 may be distributed via a communication line (including wireless communication) such as the Internet. Furthermore, the program may be encrypted, modulated, or compressed and distributed via a wired or wireless line such as the Internet, or stored on a recording medium.

[0099] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention described in the claims and their equivalents. [Explanation of symbols]

[0100] 1 elevator device, 10 elevator control system, 20 detection unit, 21 load sensor, 24 multi-optical axis sensor, 25 camera, 3 car, 31 ceiling upper surface, 311 deviation prevention position, 42 determination unit, 43 control unit

Claims

1. a detection unit that detects a worker performing work on an upper surface of the ceiling of the elevator car; a determination unit that, when receiving an instruction to operate the car from the worker, determines whether the car can be raised or lowered based on the position of the worker detected by the detection unit; a control unit that controls the elevator car to ascend and descend based on the result of the determination by the determination unit; Equipped with The ceiling upper surface has a deviation prevention position that prevents the worker's body from departing outside a projection area obtained by projecting the ceiling upper surface in the lifting direction of the elevator car, the detection unit has at least one load sensor that detects a load acting on the departure prevention position, and a second load sensor that detects a load acting on a designated position that designates the position of a part of the worker's body on the departure prevention position, and detects the worker at the departure prevention position based on the fact that the load detected by the load sensor indicates a load distribution of a human foot shape and the load detected by the second load sensor indicates a load distribution of the shape of the part of the body, The judgment unit determines that the elevator car can move up and down in response to the detection unit detecting the worker at the departure prevention position.

2. the detection unit has at least one multi-optical axis sensor that senses an area excluding the departure prevention position and optically detects the worker, and detects the worker at a position excluding the departure prevention position based on the detection of the worker by the multi-optical axis sensor; The elevator control system according to claim 1, wherein the determination unit determines that the elevator car can ascend or descend when the detection unit does not detect the worker at a position other than the departure prevention position.

3. the detection unit has at least one camera that captures an image of an area including the departure prevention position and detects the worker based on the captured image, and detects the worker at the departure prevention position based on the detection of the worker by the camera; The elevator control system according to claim 1 , wherein the determination unit determines that the elevator car can ascend or descend when the detection unit detects the worker at the departure prevention position.

4. the detection unit has at least one second camera that captures an image of an area excluding the departure prevention position and detects the worker based on the captured image, and detects the worker at a position other than the departure prevention position based on the detection of the worker by the second camera; The elevator control system according to claim 1, wherein the determination unit determines that the elevator car can ascend or descend when the detection unit does not detect the worker at a position other than the departure prevention position.

5. the detection unit includes at least one load sensor that detects a load acting on the departure prevention position, at least one multi-optical axis sensor that senses an area excluding the departure prevention position and optically detects the worker, and at least one camera that captures an image of an area including the departure prevention position and detects the worker based on the captured image; the detection unit detects the worker at the departure prevention position based on the fact that the load detected by the load sensor indicates a load distribution of a human footprint and that the worker has been detected by the camera, and detects the worker at a position other than the departure prevention position based on the fact that the worker has been detected by the multi-axis sensor; The elevator control system of claim 1, wherein the judgment unit judges that the elevator car can move up and down based on the fact that the detection unit detects the worker at the deviation prevention position and that the detection unit does not detect the worker at a position other than the deviation prevention position.

6. detecting a worker performing work on an upper surface of a ceiling of an elevator car; a step of determining whether the elevator car can be raised or lowered based on the detected position of the worker when receiving an instruction to operate the elevator car from the worker; a step of controlling the elevator car to ascend or descend based on the result of the determination; Equipped with The ceiling upper surface has a deviation prevention position that prevents the worker's body from departing outside a projection area obtained by projecting the ceiling upper surface in the lifting direction of the elevator car, the detecting step includes detecting the worker at the departure prevention position based on the fact that the load detected by at least one load sensor that detects the load acting on the departure prevention position indicates a load distribution in the shape of a human foot, and the load detected by a second load sensor that detects a load acting on a designated position that designates the position of a body part of the worker on the departure prevention position indicates a load distribution in the shape of the body part, The elevator control method includes determining that the elevator car can move up and down in response to the worker being detected at the departure prevention position, wherein the determining step includes determining that the elevator car can move up and down in response to the worker being detected at the departure prevention position.

Images