Elevator maintenance system

Abstract

To provide an elevator maintenance system capable of easily detecting that a maintenance worker attaches a safety belt hook to a hook attachment unit without necessity of dedicated work in a building.SOLUTION: An elevator maintenance system 100 comprises a safety belt hook 101 to which a marker 102 is imparted, an imaging unit 201, an image processing unit 203, and a determination unit 204. The imaging unit 201 captures a first-person view image of a worker 21 using the safety belt hook 101. The image processing unit 203 extracts a trajectory of the marker 102 from the image captured by the imaging unit 201. The determination unit 204 determines, on the basis of results of extraction of the image processing unit 203, whether the worker 21 attaches the safety belt hook 101 to the hook attachment unit arranged on the upper face of a car.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an elevator maintenance system.

Background Art

[0002] An elevator includes a hoisting machine installed at the upper end and the lower end of a hoistway, and a main rope wound around the hoisting machine. A car is suspended from one end side of the main rope, and a counterweight is suspended from the other end side of the main rope. The car and the counterweight move up and down in a pendulum manner within the hoistway by driving the hoisting machine to wind up the main rope.

[0003] In an elevator having such a configuration, when performing inspection work such as periodic inspection or maintenance, a maintenance worker stands on the top surface of the car and moves the car up and down to inspect or check devices installed in the hoistway. When a maintenance worker performs inspection work while standing on the top surface of the car, the maintenance worker needs to attach a safety belt hook to a hook attachment portion provided on the top surface of the car.

[0004] However, when the work manager is not at the installation site of the elevator, the work manager cannot confirm whether the maintenance worker has attached the safety belt hook to the hook attachment portion. Accordingly, a technology has been proposed that prevents maintenance workers from entering the hoistway without attaching the safety belt hook to the hook attachment portion and alerts maintenance workers (see Patent Document 1).

Prior Art Literature

Patent Literature

[0005]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0006] However, the maintenance information guidance method described in Patent Document 1 requires the installation of cameras in the halls on each floor, thus necessitating a special design for the elevators. Furthermore, applying the maintenance information guidance method to existing elevators would require renovation work to install cameras in the building. Additionally, installing cameras in the halls could potentially capture images of people other than maintenance workers, necessitating measures to protect personal information.

[0007] The objective of the present invention is to provide an elevator maintenance system that does not require special construction work on the building and allows for easy detection of when a maintenance worker has attached a safety harness hook to the hook attachment point, taking into consideration the above-mentioned problems. [Means for solving the problem]

[0008] To solve the above problems and achieve the objectives of the present invention, an elevator maintenance system according to one aspect of the present invention detects whether or not a safety harness hook has been attached to a hook attachment part located on the upper surface of the elevator car. This elevator maintenance system includes a safety harness hook with a marker, an imaging unit, an image processing unit, and a determination unit. Control signal receiving unit The system includes the following: The imaging unit captures an image from the first-person perspective of a worker using a safety harness hook. The image processing unit extracts the marker's trajectory from the image captured by the imaging unit. The determination unit determines, based on the extraction result from the image processing unit, whether or not the worker has attached the safety harness hook to the hook attachment part. The control signal receiving unit, upon receiving a predetermined control signal related to the elevator, causes the imaging unit to start imaging. [Effects of the Invention]

[0009] According to the elevator maintenance system with the above configuration, there is no need to carry out special construction work in the building, and it is possible to easily detect when a maintenance worker has attached a safety harness hook to the hook attachment point. Furthermore, issues, configurations, and effects other than those mentioned above will be clarified by the following description of the embodiments. [Brief explanation of the drawing]

[0010] [Figure 1]This is a schematic diagram of an elevator according to the first embodiment of the present invention. [Figure 2] This is a configuration diagram showing an example of the configuration of an elevator maintenance system according to the first embodiment of the present invention. [Figure 3] This is a block diagram showing the functional configuration of the image processing unit according to the first embodiment of the present invention. [Figure 4] This figure shows an example of the relationship between the actions of a worker on the top of the elevator car and the image captured by the imaging unit in the first embodiment of the present invention. [Figure 5] This is a flowchart showing the safety harness hook attachment detection process according to the first embodiment of the present invention. [Figure 6] This is a configuration diagram showing an example of the configuration of an elevator maintenance system according to a second embodiment of the present invention. [Modes for carrying out the invention]

[0011] 1. First Embodiment The elevator maintenance system according to the first embodiment will be described below. Note that common parts in each figure are denoted by the same reference numerals.

[0012] [Elevator] First, the configuration of the elevator according to the first embodiment will be described with reference to Figure 1. Figure 1 is a schematic diagram of the elevator according to the first embodiment.

[0013] As shown in Figure 1, elevator 1 is a so-called machine-room-less elevator that does not have a machine room above the hoistway 2 formed within the building structure. However, the elevator according to the present invention is not limited to a machine-room-less elevator, and may be an elevator that has a machine room above the hoistway 2.

[0014] Elevator 1 is equipped with a main rope 3, a car 4, a counterweight 5, and a hoisting machine 6, all located in the hoistway 2.

[0015] The hoistway 2 has a top portion 2a and a bottom portion 2b. The hoisting machine 6 is installed on the top portion 2a of the hoistway 2. The hoisting machine 6 raises and lowers the car 4 and the counterweight 5 in a suspension manner via the main rope 3.

[0016] In the hoistway 2, a pair of guide rails for the car (not shown) and a pair of guide rails for the counterweight (not shown) are arranged. The pair of guide rails for the car guide the car 4 along the lifting direction (vertical direction). The pair of guide rails for the counterweight guide the counterweight 5 along the lifting direction.

[0017] One end of the main rope 3 is fixed to the top beam 7a provided in the hoistway 2. The other end of the main rope 3 is fixed to the top beam 7b provided in the hoistway 2. After the main rope 3 is wound around the hoisting machine 6 via the counterweight 5, it is wound around a hoisting pulley provided at the lower part of the car 4.

[0018] The driving of the hoisting machine 6 is controlled by a control device 9 installed in the hoistway 2. Braking devices 13a and 13b are provided on the top portion 2a of the hoistway 2. The braking devices 13a and 13b apply a braking force to the hoisting machine 6 when stopping the driving of the hoisting machine 6.

[0019] In the following description, a coordinate system is used in which the depth direction of the car 4 is taken as the x-axis, the width direction of the car 4 is taken as the y-axis, and the lifting direction of the car 4 is taken as the z-axis.

[0020] A speed governor 10 is installed on the top portion 2a of the hoistway 2. A car position detection device 10a is installed on the speed governor 10. A speed governor weight 11 is installed on the bottom portion 2b in the hoistway 2.

[0021] An annular speed governor rope 12 connected to the car 4 is wound around the speed governor 10 and the speed governor weight 11. One end of the speed governor rope 12 is connected to the upper surface 8 of the car 4, and the other end of the speed governor rope 12 is connected to the bottom of the car 4. Thereby, the speed governor rope 12 is formed in an annular shape as a whole.

[0022] The governor rope 12 moves in conjunction with the upward and downward movement of the elevator car 4. This movement of the governor rope 12 causes the governor 10 to rotate in conjunction with the upward and downward movement of the elevator car 4. The elevator car position detection device 10a detects the position and velocity of the elevator car 4 in the z-axis direction by measuring the rotation of the governor 10.

[0023] Within the elevator shaft 2, various pieces of equipment, including the speed governor 10 and the elevator car position detection device 10a, are installed in four separate locations. Therefore, when workers perform maintenance or inspection work, they must stand on the top surface 8 of the elevator car 4 and use the top surface 8 of the elevator car 4 as a work platform (work area) to approach the various pieces of equipment within the elevator shaft 2.

[0024] When performing inspection work on elevator 1, the worker operates the control panel 17 located inside the elevator car 4 to switch the operating mode from normal mode to work mode. Then, the worker opens the landing doors 15 located at the landings 14 on each floor to create an opening, and enters the upper surface 8 of the elevator car 4 through this opening. At this time, the worker attaches a safety harness hook 101 (see Figure 4) to the hook attachment section 110 located on the upper surface 8 of the elevator car 4.

[0025] A handrail 20 (see Figure 4) for fall prevention is provided on the upper surface 8 of the elevator car 4. The handrail 20 is formed in a frame shape along the upper surface 8 and indicates the safe working area for the worker 21. In addition, an elevator car control device 16 is provided on the upper surface 8 of the elevator car 4. Each piece of equipment is installed at a different position in the z-axis direction (up and down direction) within the elevator shaft 2. The worker operates the elevator car control device 16 to raise and lower the elevator car 4 to the position corresponding to each piece of equipment.

[0026] [Elevator maintenance system] Next, the configuration of the elevator maintenance system according to the first embodiment will be described with reference to Figure 2. Figure 2 is a configuration diagram showing an example of the configuration of an elevator maintenance system according to the first embodiment.

[0027] As shown in Figure 2, the elevator maintenance system 100 includes a safety harness hook 101 and a wearable device 200.

[0028] The safety harness hook 101 is, for example, attached to a harness (fall protection device). The harness is a device worn by workers on the upper surface 8 of the elevator car 4 to ensure their safety while working. The worker attaches the safety harness hook 101 to the hook attachment part 110 described above.

[0029] The safety harness hook 101 is equipped with a marker 102 so that the wearable device 200 can detect the safety harness hook 101 even in low-light conditions. The marker 102 is, for example, a retroreflective tape set to a hue ranging from blue to green, which is the complementary color of human skin.

[0030] The wearable device 200 is, for example, a body camera that is attached to a worker's work clothes or helmet. The wearable device 200 comprises an imaging unit 201, a control unit 202, an image processing unit 203, a determination unit 204, a storage unit 205, a notification unit 206, and a communication unit 207.

[0031] The imaging unit 201 captures an image from the worker's first-person perspective. The imaging unit 201 captures an area including the marker 102 attached to the safety harness hook 101. The imaging unit 201 is, for example, a camera device, a camera module of a wearable device, or a sensor camera.

[0032] The control unit 202 provides overall control of the wearable device 200. The control unit 202, image processing unit 203, and determination unit 204 each perform calculation processing. The control unit 202, image processing unit 203, and determination unit 204 are composed of, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a GPU (Graphics Processing Unit), an AI (Artificial Intelligence) chip, etc.

[0033] The image processing unit 203 extracts markers 102 from the video captured by the imaging unit 201 and estimates the movement of the worker's arm. The image processing unit 203 will be explained later using Figure 3. The determination unit 204 determines whether or not the safety harness hook 101 has been attached to the hook attachment unit 110 based on the estimated movement of the worker's arm.

[0034] The storage unit 205 stores the video captured by the imaging unit 201, the results of image processing by the image processing unit 203, and the determination results by the determination unit 204. The storage unit 205 is, for example, an HDD (Hard Disk Drive), flash memory, etc.

[0035] The notification unit 206 alerts the worker if the determination unit 204 determines that the safety harness hook 101 is not attached to the hook attachment unit 110. The notification unit 206 is, for example, a speaker or a buzzer. The notification unit according to the present invention is not limited to those that give warnings by sound, but may also be, for example, a display device that gives warnings by characters, or a light-emitting device such as an LED (Light-Emitting Diode) that gives warnings by light.

[0036] The communication unit 207 transmits and receives various data to and from the planned work DB (database) 131, the work history DB (database) 132, and the administrator terminal device 133 via the network 121. The planned work DB 131 records information (work plan information) that shows the worker's inspection work plan. The work history DB 132 records information that shows the worker's work history, such as the judgment result of the judgment unit 204, completed work, and uncompleted work.

[0037] The communication unit 207 receives information from the planned work DB 131 that shows the worker's inspection work plan. The communication unit 207 also transmits information showing the worker's work history to the work history DB 132. Furthermore, if the determination unit 204 determines that the safety harness hook 101 is not attached to the hook attachment part 110, the communication unit 207 transmits information (e.g., name, identification number, etc.) indicating the worker who is not using the safety harness hook 101 to the administrator terminal device 133.

[0038] [Functional Configuration of the Image Processing Unit] Next, the functional configuration of the image processing unit 203 will be explained using Figure 3. Figure 3 is a block diagram showing the functional configuration of the image processing unit.

[0039] As shown in Figure 3, the image processing unit 203 includes a marker extraction unit 301 for detecting a marker 102 attached to the safety harness hook 101, a mask image generation unit 302, a mask image synthesis unit 303, and a trajectory extraction unit 304.

[0040] The marker extraction unit 301 identifies the marker 102 portion from the image captured by the imaging unit 201 and extracts the region of marker 102 (hereinafter referred to as the "marker region"). The marker extraction unit 301 extracts the region of marker 102 based on color, for example, the RGB color system or the HSV color system. If marker 102 is retroreflective tape, the marker extraction unit 301 may extract the region of marker 102 based on the difference in brightness of reflected light. In this case, the wearable device 200 may be equipped with a lighting device, or the worker may carry a lighting device.

[0041] The mask image generation unit 302 fills the areas excluding the marker regions extracted by the marker extraction unit 301 with a single color, generating a mask image that leaves only the marker regions. The mask image synthesis unit 303 generates a mask image by arranging the mask images created by the mask image generation unit 302 in chronological order. In other words, the mask image is formed from a series of consecutive images from which marker regions have been extracted.

[0042] The trajectory extraction unit 304 extracts the trajectory of the marker region from the mask image generated by the mask image synthesis unit 303. The trajectory extraction unit 304 identifies the direction of movement (trajectory) of the marker region using, for example, Opticaflow, which is one of the image processing techniques.

[0043] [Relationship between worker's actions and images captured by the imaging unit] Next, the relationship between the worker's actions and the images captured by the imaging unit 201 will be explained using Figure 4. Figure 4 shows an example of the relationship between the worker's movements on the upper surface 8 of the elevator car 4 and the image captured by the imaging unit 201.

[0044] Figure 4A shows the action of worker 21 attaching the safety harness hook 101 to the hook attachment part 110 (hereinafter referred to as the "hook attachment action") during times t1 to t3. Figure 4B shows images taken by the imaging unit 201 of the wearable device 200 attached to the head or chest of worker 21 during times t1 to t3.

[0045] As shown in Figure 4A, at time t1, the worker 21 has detached the safety belt hook 101 from the harness (fall protection device). At this time, as shown in Figure 4B, the safety belt hook 101 is not visible in the image captured by the imaging unit 201. In other words, the safety belt hook 101 held by the worker 21 is not within the field of view of the imaging unit 201.

[0046] As shown in Figure 4A, at time t2, the worker 21 is extending his hand forward and bringing the safety harness hook 101 closer to the hook attachment part 110. At this time, as shown in Figure 4B, the image captured by the imaging unit 201 shows the safety harness hook 101 moving from the lower end to the upper end. In other words, the field of view of the imaging unit 201 includes the safety harness hook 101 that the worker 21 is gripping.

[0047] As shown in Figure 4A, at time t3, worker 21 has attached the safety harness hook 101 to the hook attachment part 110. At this time, as shown in Figure 4B, the image captured by the imaging unit 201 shows the safety harness hook 101 and the arm of worker 21 that is gripping the safety harness hook 101. In other words, the field of view of the imaging unit 201 includes both the safety harness hook 101 and the arm of worker 21.

[0048] Thus, the hook attachment operation is captured in the image taken by the imaging unit 201 as the movement of the safety harness hook 101 from the bottom to the top. A marker 102 is attached to the safety harness hook 101. Therefore, when the trajectory of the marker 102 moving from the bottom to the top of the image is extracted from the masked image, it can be determined that the hook attachment operation has been performed. Furthermore, there is no need to perform any special construction work such as installing a camera in the building.

[0049] [Safety harness hook attachment detection process] Next, the safety harness hook attachment detection process, which detects whether or not the worker 21 has attached the safety harness hook 101 to the hook attachment part 110, will be explained using Figure 5. Figure 5 is a flowchart showing the safety harness hook attachment detection process.

[0050] First, worker 21 attaches a marker 102 to the safety harness hook 101 (S1). In step S1, for example, worker 21 attaches a marker 102 made of retroreflective tape to the safety harness hook 101. At this time, it is desirable to attach the marker 102 to a large surface area of ​​the safety harness hook 101 so that it can be easily imaged by the imaging unit 201 of the wearable device 200. If a marker 102 has already been attached to the safety harness hook 101, step S1 can be omitted.

[0051] Next, the imaging unit 201 of the wearable device 200 attached to the head or chest of the worker 21 starts imaging (S2). In step S2, the worker 21 operates the wearable device 200 to start imaging by the imaging unit 201. In step S2, the image captured by the imaging unit 201 is stored in the storage unit 205.

[0052] Furthermore, in step S2, if the illumination of the elevator shaft 2 is insufficient, it is desirable to illuminate the imaging area (in front of the worker) using a lighting device held by the worker or a lighting device provided on the wearable device 200.

[0053] Next, the marker extraction unit 301 of the image processing unit 203 determines whether or not it can extract the marker 102 from the image captured in step S2 (S3). If it is determined in step S3 that the marker 102 can be extracted (if S3 is a YES determination), the mask image generation unit 302 of the image processing unit 203 generates a mask image that leaves only the marker region from the image (S4).

[0054] Next, the mask image synthesis unit 303 of the image processing unit 203 generates a mask image by arranging the mask images in chronological order (S5). The mask image synthesis unit 303 updates the mask image by adding the mask image each time a mask image is generated in step S4. In step S5, the mask image generated (updated) by the mask image synthesis unit 303 is stored in the storage unit 205. After the completion of step S5, the image processing unit 203 returns to step S3.

[0055] If it is determined in step S3 that the marker 102 cannot be extracted (S3 is a NO determination), the trajectory extraction unit 304 of the image processing unit 203 determines whether or not the mask image generated in step S5 is stored in the storage unit 205 (S6). If it is determined in step S6 that the mask image is not stored in the storage unit 205 (S6 is a NO determination), the image processing unit 203 returns to step S2.

[0056] In step S6, if it is determined that the mask image is stored in the memory unit 205 (if S6 is determined to be YES), the trajectory extraction unit 304 extracts the trajectory (movement path) of the marker 102 from the mask image in step S7. In step S7, the trajectory extraction unit 304 calculates the trajectory (movement path) of the marker 102 using, for example, sparse optical flow.

[0057] Next, the determination unit 204 determines whether the trajectory of the marker 102 extracted in step S7 matches the trajectory corresponding to the hook attachment operation (S8). If, in step S8, it is determined that the trajectory of the marker 102 does not match the trajectory corresponding to the hook attachment operation (S8 is a NO determination), the control unit 202 causes the notification unit 206 to send a warning indicating that the safety harness hook 101 has not been attached to the hook attachment unit 110 (S9). This allows the wearable device 200 to prompt the attachment of the safety harness hook 101 to the hook attachment unit 110.

[0058] Next, the control unit 202 causes the communication unit 207 to transmit information (for example, the worker's name, worker's identification number, etc.) indicating the worker 21 who has not attached the safety harness hook 101 to the hook attachment unit 110 to the administrator terminal device 133 (S10). The communication unit 207 notifies the administrator of the information indicating the worker 21 who has not attached the safety harness hook 101 to the hook attachment unit 110, for example, using email, chat, or SNS (Social Networking Service).

[0059] The control unit 202 may also have the communication unit 207 transmit information indicating the worker 21 to whom the safety harness hook 101 is attached to the hook attachment unit 110 (for example, the worker's name, the worker's identification number, etc.) to the administrator terminal device 133. In other words, the control unit 202 may also have the communication unit 207 transmit the determination result of the determination unit 204 to the administrator terminal device 133.

[0060] After processing in step S10, or in step S8, if it is determined that the trajectory of the marker 102 matches the trajectory corresponding to the hook attachment operation (if S8 is determined to be YES), the control unit 202 has the communication unit 207 transmit the status of worker 21's use of the safety harness hook 101 to the work history DB 132 (S10). The work history DB 132 stores the status of worker 21's use of the safety harness hook 101. After processing in step S20, the control unit 202 terminates the safety harness hook attachment detection process.

[0061] 2. Second Embodiment [Elevator maintenance system] Next, the elevator maintenance system according to the second embodiment will be described with reference to Figure 6. Note that common parts in each figure are denoted by the same reference numerals. Figure 6 is a configuration diagram showing an example of the configuration of an elevator maintenance system according to the second embodiment.

[0062] The elevator maintenance system 100A according to the second embodiment has the same configuration as the elevator maintenance system 100 according to the first embodiment (see Figure 2). The difference between the elevator maintenance system 100A and the elevator maintenance system 100 is the wearable device 200A. Therefore, the configuration of the wearable device 200A will be described here, and the description of the configuration that overlaps with the elevator maintenance system 100 will be omitted.

[0063] As shown in Figure 6, the wearable device 200A is, for example, a body camera that is attached to a worker's work clothes or helmet. The wearable device 200A comprises an imaging unit 201, a control unit 202, an image processing unit 203, a determination unit 204, a storage unit 205, a notification unit 206, a communication unit 207, and a control signal receiving unit 208.

[0064] When the control signal receiving unit 208 receives a predetermined control signal related to the elevator 1, it causes the imaging unit 201 to start imaging via the control unit 202. The control signal receiving unit 208 is a device that performs calculation processing. The control signal receiving unit 208 is composed of, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a GPU (Graphics Processing Unit), etc.

[0065] A predetermined control signal for elevator 1 is sent from a control device 9 (see Figure 1) installed in the hoistway 2 to a control signal receiving unit 208 via the network 121 and communication unit 207. An example of a predetermined control signal for elevator 1 is a maintenance operation start signal. The maintenance operation start signal is transmitted from the control panel 17 (see Figure 1) when the worker 21 switches the operation mode from normal mode to work mode by operating the maintenance operation changeover switch provided on the control panel 17.

[0066] Furthermore, a predetermined control signal for elevator 1 is, for example, the car-top operation start signal. The car-top operation start signal is transmitted from the car-top control device 16 (see Figure 1) when the worker 21 operates the car-top operation control switch provided on the car-top control device 16.

[0067] In the safety harness hook attachment detection process according to the second embodiment, when the control signal receiving unit 208 receives a predetermined control signal related to the elevator 1, imaging by the imaging unit 201 is started. This prevents imaging by the imaging unit 201 from not starting due to human error. As a result, when the worker 21 stands on the upper surface 8 of the elevator car 4, it is always possible to detect whether or not the safety harness hook 101 has been attached to the hook attachment unit 110.

[0068] In addition, the elevator maintenance system according to the present invention may be configured such that the control unit 202 also functions as a control signal receiving unit. In this case, when the control unit 202 receives a predetermined control signal related to the elevator 1, it causes the imaging unit 201 to start imaging.

[0069] 3. Summary (1) The elevator maintenance system 100 according to the above embodiment detects whether or not a safety harness hook 101 has been attached to the hook attachment part 110 located on the upper surface 8 of the elevator car 4. This elevator maintenance system 100 comprises a safety harness hook 101 with a marker 102 attached, an imaging unit 201, an image processing unit 203, and a determination unit 204. The imaging unit 201 captures an image from the first-person perspective of a worker 21 using the safety harness hook 101. The image processing unit 203 extracts the trajectory of the marker 102 from the image captured by the imaging unit 201. The determination unit 204 determines whether or not the worker 21 has attached the safety harness hook 101 to the hook attachment part 110 based on the extraction result from the image processing unit 203. This eliminates the need for specialized construction work, such as installing cameras in the building, and makes it easy to detect when a worker 21 has attached the safety harness hook 101 to the hook attachment section 110.

[0070] (2) The image processing unit 203 according to the above embodiment also includes a marker extraction unit 301, a mask image generation unit 302, and a trajectory extraction unit 304. The marker extraction unit 301 extracts an image containing the marker 102 from an image captured by the imaging unit 201. The mask image generation unit 302 applies a masking process to the image extracted by the marker extraction unit 301 to generate a mask image. The trajectory extraction unit 304 extracts the trajectory of the marker 102 from a plurality of mask images arranged in chronological order. This allows the marker 102 to be accurately extracted from the image captured by the imaging unit 201. Furthermore, the accuracy of extracting the trajectory of the marker 102 can be improved. As a result, the reliability of detecting whether or not the safety harness hook 101 has been attached to the hook attachment unit 110 can be improved.

[0071] (3) Furthermore, the determination unit 204 according to the above embodiment determines that the safety harness hook 101 has been attached to the hook attachment unit 110 when the trajectory of the marker 102 moves from the bottom edge of the image toward the top edge of the image. This eliminates the need to directly confirm from the image that the safety harness hook 101 has been attached to the hook attachment part 110, and allows for the identification of the safety harness hook 101 being attached to the hook attachment part 110 through simple image processing.

[0072] (4) Furthermore, the marker 102 according to the above embodiment is set to a hue ranging from blue to green, which is the complementary color of human skin. This increases the contrast between the worker's hand (arm) and the marker 102, making it easier to extract the marker 102 from the image captured by the imaging unit 201. As a result, the accuracy of extracting the trajectory of the marker 102 can be improved.

[0073] (5) The wearable device 200 according to the above embodiment also includes an imaging unit 201, an image processing unit 203, a determination unit 204, and a notification unit 206. The notification unit 206 notifies the worker 21 of a warning when the determination unit 204 determines that the safety harness hook 101 is not attached to the hook attachment unit 110. This facilitates the attachment of the safety harness hook 101 to the hook attachment portion 110.

[0074] (6) The elevator maintenance system 100 according to the above embodiment also includes a communication unit 207 that transmits the determination result of the determination unit 204 to the administrator terminal device 133 (administrator's terminal device). This allows the work supervisor to know whether or not worker 21 has attached the safety harness hook 101 to the hook attachment part 110, even if they are not present at the elevator 1 installation site.

[0075] (7) The elevator maintenance system 100A according to the above embodiment also includes a control signal receiving unit 208 that causes the imaging unit 201 to start imaging when it receives a predetermined control signal relating to the elevator 1. This prevents the imaging unit 201 from failing to start imaging.

[0076] The embodiments of the elevator maintenance system, including its effects, have been described above. However, the elevator maintenance system of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the invention as described in the claims.

[0077] Furthermore, the embodiments described above are explained in detail for the purpose of clearly illustrating the present invention, and are not necessarily limited to those comprising all the described configurations. It is also possible to replace parts of the configuration of one embodiment with those of another embodiment, and to add configurations from other embodiments to the configuration of one embodiment. Additionally, it is possible to add, delete, or replace parts of the configuration of each embodiment with those of other embodiments.

[0078] Furthermore, some or all of the configurations, functions, processing units, and processing means of the embodiments described above may be implemented in hardware, for example, by designing them as integrated circuits. Alternatively, the configurations and functions of the embodiments described above may be implemented in software by having a processor interpret and execute programs that implement each function. Information such as programs, tables, and files that implement each function can be stored in a recording device such as memory, a hard disk, or an SSD (Solid State Drive), or on a recording medium such as a memory card or a DVD (Digital Versatile Disc).

[0079] Furthermore, the control lines and information lines in the drawings of the embodiments described above are those deemed necessary for explanation. However, the drawings of the embodiments described above do not necessarily show all control lines and information lines. In reality, it can be assumed that almost all components are interconnected.

[0080] In the embodiment described above, the wearable device 200 includes an image processing unit 203, a determination unit 204, and a storage unit 205. However, the image processing unit, determination unit, and storage unit according to the present invention may be provided not in the wearable device, but in an information processing device connected via the network 121. In this case, the wearable device transmits the image captured by the imaging unit to the information processing device via the network 121. The wearable device then receives the determination result from the determination unit in the information processing device. If the received determination result is "the safety harness hook 101 is not attached to the hook attachment unit 110", the wearable device executes a warning via the notification unit. [Explanation of Symbols]

[0081] 1...Elevator, 2...Hoistway, 3...Main rope, 4...Elevator car, 6...Hoisting machine, 7a,7b...Top beam, 8...Top surface, 9...Control device, 10...Governor, 10a...Position detection device, 12...Governor rope, 13a,13b...Braking device, 14...Landing, 15...Landing door, 16...Elevator car top control device, 17...Control panel, 20...Handrail for fall prevention, 21...Worker, 100,100A...Elevator maintenance system, 101...Safety belt hook, 102...Marker, 110...Hook mounting part, 121...Network, 131...Planned work DB, 132...Work history DB, 133...Administrator terminal device, 200,200A...Wearable device, 201...Imaging unit, 202...Control unit, 203…Image processing unit, 204…Determination unit, 205…Storage unit, 206…Notification unit, 207…Communication unit, 208…Control signal receiving unit, 301…Marker extraction unit, 302…Mask image generation unit, 303…Mask image synthesis unit, 304…Trajectory extraction unit

Claims

1. In an elevator maintenance system that detects whether or not a worker has attached a safety harness hook to a hook attachment point located on the top surface of the elevator car, The safety harness hook with a marker attached, An imaging unit that captures an image from the first-person perspective of a worker using the safety harness hook, An image processing unit extracts the trajectory of the marker from the image captured by the imaging unit, A determination unit determines whether or not the safety harness hook has been attached to the hook attachment part based on the extraction results of the image processing unit, The system includes a control signal receiving unit that, upon receiving a predetermined control signal related to the elevator, causes the imaging unit to start imaging. Elevator maintenance system.

2. The aforementioned image processing unit, A marker extraction unit extracts an image containing the marker from an image captured by the imaging unit, A mask image generation unit generates a mask image by performing a masking process that fills in the area of ​​the image extracted by the marker extraction unit that excludes the markers, The system includes a trajectory extraction unit that extracts the trajectory of the marker from a plurality of mask images arranged in chronological order. The elevator maintenance system according to claim 1.

3. The determination unit determines that the safety harness hook is attached to the hook attachment part when the trajectory of the marker moves from the bottom edge of the image towards the top edge of the image. The elevator maintenance system according to claim 1.

4. The aforementioned markers are set to hues ranging from blue to green, which are complementary colors to human skin tones. The elevator maintenance system according to claim 1.

5. A wearable device comprising an imaging unit, an image processing unit, a determination unit, a control signal receiving unit, and a notification unit, The notification unit notifies the worker of a warning when the determination unit determines that the safety harness hook is not attached to the hook attachment part. The elevator maintenance system according to claim 1.

6. The system includes a communication unit that transmits the determination result of the determination unit to the terminal device of the work manager. The elevator maintenance system according to claim 1.

7. The predetermined control signal for the elevator is transmitted when a predetermined switch is operated during maintenance work on the elevator. The elevator maintenance system according to claim 1.

Images