Security system

Abstract

Provided is a safety system capable of easily managing the safety of a person present inside a hoistway. The safety system is provided with: a car-side device which is attached to a car of an elevator, transmits car-side radio waves, and detects the reception intensity and the reception angle of the received radio waves; a landing-side device which is installed at a height position of the lowermost landing in the hoistway, transmits landing-side radio waves, and detects the reception intensity and the reception angle of the received radio waves; and a person-side device that is attached to a person present inside the hoistway and that transmits a person-side radio wave, the car-side device or the landing-side device determining whether the distance between the car and the person is shorter than a threshold distance on the basis of the reception intensity of the person-side radio wave received by the car-side device and the reception angle of the person-side radio wave, the landing side device stops the car when it is determined that the distance between the car and the person is shorter than the threshold distance, and does not stop the car when it is determined that the distance between the car and the person is equal to or longer than the threshold distance.

Description

Technical Field

[0001] The invention relates to a safety system for an elevator. Background Art

[0002] Patent document 1 discloses an elevator safety system. In the safety system, a camera is installed inside the hoistway. The camera takes a picture of a worker inside the pit. A supervisor at a distance monitors the safety of the worker by checking the image of the camera. For example, if the supervisor determines that the safety of the worker is compromised, the supervisor can stop the operation of the elevator.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-074521 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, in the safety system described in Patent Document 1, a monitoring person is required in addition to the workers to monitor the inside of the pit, so the safety management of the workers is expensive.

[0008] The present invention has been made to solve the above-mentioned problems. An object of the present invention is to provide a safety system that can easily manage the safety of people inside a hoistway.

[0009] Means for solving problems

[0010] The safety system of the present invention comprises: a car-side device, which is installed in the car of the elevator, transmits car-side radio waves, and detects the receiving strength and receiving angle of the received radio waves; a floor station side device, which is installed at the height position of the lowest floor station inside the elevator shaft, transmits floor station side radio waves, and detects the receiving strength and receiving angle of the received radio waves; and a human-side device, which is installed on the human existing inside the shaft, transmits human-side radio waves, and the car-side device or the floor station side device determines whether the distance between the car and the human is shorter than a threshold distance based on the receiving strength and receiving angle of the human-side radio waves received by the car-side device. When it is determined that the distance between the car and the human is shorter than the threshold distance, the floor station side device causes the elevator control panel to stop the car. When it is determined that the distance between the car and the human is the same as the threshold distance or longer than the threshold distance, the floor station side device does not stop the car.

[0011] Effects of the Invention

[0012] According to the present invention, the car is stopped when it is determined that the distance between the car and the person is shorter than the threshold distance. Therefore, the safety of the person present in the hoistway can be easily managed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a diagram showing an overview of the security system in the first embodiment.

[0014] Figure 2 This is a block diagram of the security system in the first embodiment.

[0015] Figure 3 This is a diagram showing an overview of the security system in the first embodiment.

[0016] Figure 4 This is a diagram showing an overview of the security system in the first embodiment.

[0017] Figure 5 This is a flowchart for explaining an outline of the second operation of the safety system in the first embodiment.

[0018] Figure 6 This is a diagram showing an overview of the security system in the first embodiment.

[0019] Figure 7 This is a diagram showing an overview of a security system in the second embodiment.

[0020] Figure 8 This is a diagram showing a flowchart of the operation of the security system in the second embodiment.

[0021] Fig. 9 This is a diagram showing an overview of a security system in a third embodiment. DETAILED DESCRIPTION

[0022] The embodiment of the present invention will be described with reference to the accompanying drawings. In addition, in each figure, the same or corresponding parts are marked with the same reference numerals, and the repeated description of the parts is appropriately simplified or omitted.

[0023] Implementation method 1.

[0024] Figure 1 This is a diagram showing an overview of the security system in the first embodiment.

[0025] exist Figure 1 In the elevator system 1, a hoistway 2 passes through each floor of a building 3. A pit 2a is the bottom of the hoistway 2. Although not shown, pit equipment such as a buffer and a pit switch are provided in the pit 2a.

[0026] The plurality of landings 4 are respectively provided on each floor of the building 3. The plurality of landings 4 are respectively opposed to the hoistway 2. Figure 1 4a, the lowest floor 4, and the upper floor 4b, the second floor 4, are shown in FIG. The plurality of landing floors 5 correspond to the plurality of landings 4, respectively. The landing floor 5 is the floor of the corresponding landing 4. Figure 1 In the figure, the lowermost landing floor 5a and the upper second landing floor 5b are shown.

[0027] The car 6 is installed inside the hoistway 2. The car 6 can be raised and lowered inside the hoistway 2. The car 6 has a car bottom surface 6a. The car bottom surface 6a is the surface facing the pit 2a among the outer surfaces of the car 6. For example, the car bottom surface 6a is the part of the car 6 that exists at the bottom.

[0028] The control panel 7 is installed in a machine room (not shown). The control panel 7 can control the elevator system 1 as a whole. Specifically, the control panel 7 can control the lifting and lowering operation of the car 6 as a whole.

[0029] The safety system 10 is applied to the elevator system 1. The safety system 10 is a system for ensuring the safety of a person H who performs maintenance work in the pit 2a. For example, the person H performs maintenance work such as inspection of equipment under the car 6 and investigation of abnormal noise in the pit 2a. At this time, the car 6 may be moved by the person H through a lifting operation for inspection. Alternatively, the car 6 may be manually operated by an operator other than the person H.

[0030] The safety system 10 includes a car-side device 20, a landing-side device 30, and a human-side device 40. The safety system 10 may include the configuration of the elevator system 1 such as the control panel 7.

[0031] The car side device 20 is mounted on the car 6. For example, the car side device 20 is mounted on the car bottom surface 6a. The distance to the lowest part of the car 6 is set in the car side device 20. In addition, when the car side device 20 is mounted on the car bottom surface 6a, in the car side device 20, the distance to the lowest part of the car 6 can be set to 0, or the setting of the distance to the lowest part of the car 6 can be omitted.

[0032] The car-side device 20 acts as a beacon device to transmit and receive radio waves of a specific frequency. For example, the car-side device 20 transmits car-side radio waves. The car-side device 20 detects the reception strength of the received radio waves. Based on the reception strength of the radio waves, the car-side device 20 detects the distance to the device that transmitted the radio waves. The car-side device 20 detects the direction in which the device that transmitted the radio waves exists based on the phase of the received radio waves, etc. Based on the detected information, the car-side device 20 detects the angle in which the device that transmitted the radio waves exists relative to the reference direction, that is, the reception angle.

[0033] The landing side device 30 is installed on the inner side of the hoistway 2. For example, the landing side device 30 is installed on the inner wall of the hoistway 2. At this time, the landing side device 30 is installed at the same height as the landing floor 5a of the lowest landing 4a relative to the bottom surface of the pit 2a. The vertical distance to the landing floor 5a is set in the landing side device 30. In addition, when the landing side device 30 is installed at the same height as the landing floor 5a, in the landing side device 30, the distance to the landing floor 5a can be set to 0, and the setting of the distance to the landing floor 5a can also be omitted.

[0034] The landing side device 30 transmits and receives radio waves of a specific frequency as a beacon device, similarly to the car side device 20. For example, the landing side device 30 transmits landing side radio waves. The car side device 20 detects the reception intensity of the received radio waves. Similar to the car side device 20, the landing side device 30 detects the distance and reception angle from the device that transmits the radio waves based on the reception intensity, phase, etc. of the received radio waves.

[0035] The landing side device 30 can notify the control panel 7 of a command for stopping the car 6. Specifically, for example, the landing side device 30 is electrically connected to the pit switch and can cut off the safety circuit of the elevator system 1. When the safety circuit is cut off, the control panel 7 stops the car 6. In addition, the landing side device 30 can also be configured to be able to communicate with the control panel 7 in a wired or wireless manner. In this case, it is also possible that the landing side device 30 can send a command to stop the car 6 to the control panel 7. For example, as an action to stop the car 6, the landing side device 30 can also send a command to stop the car 6 to the control panel 7 instead of cutting off the safety circuit.

[0036] The human-side device 40 is attached to the human H working in the pit 2a. For example, the human-side device 40 is attached to the top of the head of the human H. The distance to the top of the head of the attached human is set in the human-side device 40. In addition, when the human-side device 40 is attached to the top of the head of the human H, the distance to the top of the head of the human may be set to 0 in the human-side device 40, or the setting of the distance to the top of the head of the human may be omitted.

[0037] The human-side device 40 acts as a beacon device, and transmits and receives radio waves of a specific frequency. For example, the human-side device 40 transmits human-side radio waves.

[0038] When the maintenance inspection of the elevator system 1 is performed, the car 6 may be raised or lowered while the person H is present in the pit 2a. At this time, the person-side device 40 transmits the person-side radio wave at a predetermined period. The car-side device 20 receives the person-side radio wave. The car-side device 20 calculates the distance between the top of the person's head and the lowest part of the car 6 based on the received person-side radio wave. When the distance is less than a predetermined threshold value, the landing-side device 30 stops the car 6.

[0039] Next, use Figure 2 The security system 10 is described.

[0040] Figure 2 This is a block diagram of the security system in the first embodiment.

[0041] like Figure 2 As shown, the car-side device 20 includes a radio wave unit 21 , a detection unit 22 , and a calculation unit 23 .

[0042] The radio wave unit 21 is a radio wave unit on the car side that transmits and receives radio waves. For example, the radio wave unit 21 includes one or more antennas and antenna control devices. Specifically, the radio wave unit 21 can also transmit, receive and control radio waves using BLE (Bluetooth Low Energy) technology based on the Bluetooth (registered trademark) standard. Through the radio wave unit 21, the car side device 20 can communicate with the floor station side device 30 and the human side device 40 via radio waves.

[0043] The radio wave unit 21 can detect the reception intensity of the received radio wave and the direction from which the radio wave is sent. Specifically, for example, the radio wave unit 21 detects the direction from which the radio wave is sent using multiple antennas based on a radio wave angle measurement method called AoA (Angle of Arrival). At this time, the radio wave unit 21 detects the direction from which the radio wave is sent by detecting the phase difference of the radio waves received by each of the multiple antennas. The radio wave unit 21 detects the reception angle based on the direction.

[0044] The detection unit 22 is a sensor that detects the acceleration of the car-side device 20. For example, the detection unit 22 detects the movement of the car 6 by detecting the acceleration.

[0045] The operation unit 23, as an operation unit on the car side, performs operations based on the radio waves received by the radio wave unit 21 and the measured values ​​of the detection unit 22. The operation unit 23 performs operations for each determination performed by the car side device 20. For example, the operation unit 23 is a microcomputer having a memory and a processor. Information required for the operation is stored in the operation unit 23. The function of the operation unit 23 is realized by the processor executing a program stored in the memory.

[0046] The landing-side device 30 includes a radio wave unit 31 , a communication unit 32 , a command unit 33 , and a calculation unit 34 .

[0047] The radio unit 31 transmits and receives radio waves as a radio unit on the floor station side. For example, the radio unit 31 includes one or more antennas and an antenna control device. The radio unit 31 transmits and receives radio waves and controls them using the BLE technology in accordance with the Bluetooth standard, similarly to the radio unit 21.

[0048] The radio wave unit 31 can detect the reception intensity of the received radio wave and the direction from which the radio wave is transmitted. The radio wave unit 31 detects the direction from which the radio wave is transmitted based on the same radio wave angle measurement method as the radio wave unit 21. The radio wave unit 31 detects the reception angle based on the direction.

[0049] The communication unit 32 can communicate with the control panel 7. For example, the communication unit 32 is an interface for electrically communicating with the control panel 7. Specifically, the communication unit 32 communicates with the control panel 7. Figure 2 The serial communication wiring which is not shown in the figure is connected to each of the plurality of landing stations 4. The serial wiring is connected to the control panel 7.

[0050] The command unit 33 is a device capable of notifying the control panel 7 of a command for stopping the car 6. For example, the command unit 33 is a contact that disconnects a safety circuit not shown. In this case, the command unit 33 is electrically connected to a pit switch not shown. In addition, for example, the command unit 33 is an interface for sending a command to the control panel 7. In addition, the function of the command unit 33 may also be included in the communication unit 32.

[0051] The operation unit 34, as an operation unit on the landing side, performs operations based on the radio waves received by the radio wave unit 31 and the information received by the communication unit 32. The operation unit 34 performs operations for each determination performed by the landing side device 30. For example, the operation unit 34 is a microcomputer having a memory and a processor. Information required for the operation is stored in the operation unit 34. The operation unit 34 can control the operation of the instruction unit 33. The function of the operation unit 34 is realized by the processor executing the program stored in the memory.

[0052] The human-side device 40 has a radio wave unit 41 and a notification unit 42. The radio wave unit 41, as a radio wave unit on the human side, transmits and receives radio waves. For example, the radio wave unit 41 includes one or more antennas and a control device for the antenna. The radio wave unit 41, like the radio wave unit 21 and the radio wave unit 31, transmits, receives and controls radio waves using BLE technology in accordance with the Bluetooth (registered trademark) standard. The notification unit 42 can notify information to a person. For example, the notification unit 42 includes a speaker that emits sound and a control device for the speaker. For example, the notification unit 42 emits sound based on the radio waves received by the radio wave unit 41.

[0053] In addition, the radio wave unit 21, the radio wave unit 31, and the radio wave unit 41 may detect the direction of the device transmitting the radio wave based on other radio wave angle measurement methods instead of the method called AoA. Specifically, for example, the radio wave unit 21, the radio wave unit 31, and the radio wave unit 41 may also operate based on a radio wave angle measurement technology called AoD (Angle of Departure).

[0054] When an angle measurement technique called AoD is adopted, the radio wave unit 41 includes a plurality of antennas. The radio wave unit 41 transmits a plurality of human-side radio waves corresponding to the plurality of antennas. The radio wave unit 21 and the radio wave unit 31 may each include at least one antenna. The radio wave unit 21 detects the direction in which the human-side radio wave is transmitted, that is, the direction in which the human-side device 40 exists, by detecting the difference in phase between the plurality of human-side radio waves. The radio wave unit 31 detects the direction in which the human-side device 40 exists, similarly to the radio wave unit 21.

[0055] Next, use Figure 3 The first operation of the safety system 10 will be described.

[0056] Figure 3 This is a diagram showing an overview of the security system in the first embodiment.

[0057] like Figure 3 As shown, in the first operation, the car-side device 20 calculates the distance Y between the top of the head of the person H and the lowest part of the car 6. Hereinafter, the height position of the person-side device 40 is regarded as the height position of the top of the head of the person H. The height position of the car-side device 20 is regarded as the height position of the lowest part of the car 6. That is, the distance Y is the distance between the person-side device 40 and the car bottom surface 6a.

[0058] The car-side device 20 receives the human-side radio wave transmitted from the human-side device 40. The car-side device 20 calculates the distance X between the car-side device 20 and the human-side device 40 based on the reception intensity of the human-side radio wave.

[0059] The car-side device 20 detects the direction in which the human-side device 40 exists based on the received human-side radio wave. The car-side device 20 detects the reception angle θ of the human-side device 40 relative to the car bottom surface 6a based on the direction in which the human-side device 40 exists. The reception angle θ is the angle formed by the line segment connecting the car-side device 20 to the human-side device 40 and the car bottom surface 6a as the reference surface. Alternatively, the reception angle θ is the elevation angle of the human-side device 40 when the car-side device 20 is taken as the origin and the car bottom surface 6a is taken as the reference surface.

[0060] The car side device 20 calculates the distance Y from the calculated distance X and the receiving angle θ based on the following formula (1). Figure 2 The geometric relationships shown are derived.

[0061] Y=X*sinθ (1)

[0062] The car side device 20 determines whether the calculated distance Y is smaller than a predetermined threshold distance. When the car side device 20 determines that the distance Y is greater than the predetermined threshold distance, it determines that the safety of the person H is ensured and does not perform any special operation. In addition, the car side device 20 may also cause the person side device 40 to notify information indicating the calculated distance Y by sound or the like.

[0063] When the car-side device 20 determines that the distance Y is less than a predetermined threshold distance, it transmits a car-side radio wave indicating a command to stop the car 6. The landing-side device 30 receives the car-side radio wave. In this case, the landing-side device 30 causes the control panel 7 to stop the car 6. The control panel 7 stops the car 6. In addition, when the human-side device 40 receives the car-side radio wave, it may also notify the danger by sound or the like.

[0064] Next, use Figure 4 and Figure 5 The second operation of the safety system will be described.

[0065] Figure 4 This is a diagram showing an overview of the security system in the first embodiment. Figure 5 This is a flowchart for explaining an outline of the second operation of the safety system in the first embodiment.

[0066] In the second operation, the car side device 20 calculates the distance X' after correcting the distance X calculated in the first operation. The car side device 20 uses the distance X' instead of the distance X. That is, the car side device 20 calculates the distance Y from the distance X' and the receiving angle θ based on equation (1). The correction of the distance X is performed based on one of several methods.

[0067] In one example of the correction method, the distance X is corrected based on the measurement value of the acceleration sensor as the detection unit 22. When performing this correction, the car-side device 20 also uses the information on the reception intensity of the landing-side radio wave from the landing-side device 30.

[0068] Specifically, the car side device 20 calculates the first distance A between the lowest part of the car 6 and the lowest floor floor 5a based on the reception intensity of the radio wave on the floor station side. The first distance A is a distance based on the reception intensity of the radio wave. In addition, the distance between the lowest part of the car 6 and the lowest floor floor 5a can be regarded as the same value as the difference between the height position of the car side device 20 and the height position of the floor station side device 30. When calculating the first distance A, the distance between the lowest part of the car 6 and the car side device 20 can be used. When calculating the first distance A, the distance between the floor floor 5a and the floor station side device 30 can also be used.

[0069] The detection unit 22 of the car side device 20 always measures the acceleration in the lifting direction of the car 6. The car side device 20 calculates the moving speed of the car side device 20 and the moving distance of the car side device 20 by integrating the measured value of the acceleration over time. That is, the car side device 20 calculates the height position of the car 6. Based on the moving distance, the car side device 20 calculates the second distance B between the lowermost part of the car 6 and the landing floor 5a. The second distance B is a distance based on acceleration. In addition, the second distance B, like the first distance A, can be regarded as the same value as the difference between the height position of the car side device 20 and the height position of the landing side device 30.

[0070] In one example of the correction method, the car-side device 20 determines that the car 6 stops at the lowest floor station 4a when the moving speed of the car 6 is 0 and the first distance A is 0. In this case, the car-side device 20 resets the second distance B based on the acceleration to 0. The car-side device 20 determines that the car 6 stops at the upper floor station 4b when the moving speed of the car 6 is 0 and the first distance A is the distance from the lowest floor station 4a to the upper floor station 4b. In this case, the car-side device 20 resets the second distance B based on the acceleration to the distance from the lowest floor station 4a to the upper floor station 4b. The distance from the lowest floor station 4a to the upper floor station 4b is set for each building and stored in the car-side device 20. For example, the distance is set to 4m.

[0071] The car-side device 20 calculates the corrected distance X' from the distance X, the first distance A, and the second distance B based on the following formula (2).

[0072] X′=X*B / A (2)

[0073] Then, the car-side device 20 calculates the distance Y based on the distance X' and performs the same operation as the first operation. That is, based on the first distance A and the second distance B, the distance Y is corrected.

[0074] Figure 5 The flowchart shown starts at an arbitrary timing. In addition, in this flowchart, the car 6 is in a state where it has not stopped at either the lowest floor landing 4a or the upper floor landing 4b.

[0075] In step S001, the human-side device 40 transmits a human-side radio wave, and the car-side device 20 receives the human-side radio wave.

[0076] Then, the operation of step S002 is performed. In step S002, the car-side device 20 calculates the distance X based on the reception intensity of the human-side radio wave. The car-side device 20 calculates the reception angle θ.

[0077] Then, the operation of step S003 is performed. In step S003, the car-side device 20 receives the landing-side radio wave. The car-side device 20 calculates the first distance A based on the reception intensity of the radio wave. The car-side device 20 calculates the second distance B based on the acceleration.

[0078] Then, the operation of step S004 is performed. In step S004, the car-side device 20 calculates the distance X' obtained by correcting the distance X using the first distance A and the second distance B.

[0079] Then, the operation of step S005 is performed. In step S005, the car-side device 20 calculates the distance Y.

[0080] Then, the operation of step S006 is performed. In step S006, the car-side device 20 determines whether the distance Y is smaller than a predetermined threshold distance.

[0081] If it is determined in step S006 that the distance Y is equal to or greater than the predetermined threshold distance, the operation of step S007 is performed. In step S007, the car-side device 20 sends a command to the human-side device 40 to notify the value of the distance Y. The human-side device 40 notifies the human H of the value of the distance Y by voice.

[0082] Then, the actions of the flowchart end.

[0083] If it is determined in step S006 that the distance Y is less than the predetermined threshold distance, the operation of step S008 is performed. In step S008, the car-side device 20 transmits a car-side radio wave indicating a command to stop the car 6. The landing-side device 30 performs an operation to stop the car 6 based on the car-side radio wave. The human-side device 40 notifies the danger based on the car-side radio wave.

[0084] Then, the actions of the flowchart end.

[0085] Furthermore, after the car 6 is stopped by the landing-side device 30 , a worker such as a person H performs an operation to restart the operation of the car 6 .

[0086] In addition, in the first action, omit Figure 5 In steps S003 and S004 in the flowchart, the action of step S005 is performed after step S002.

[0087] According to the first embodiment described above, the safety system 10 includes a car side device 20, a landing side device 30, and a person side device 40. The car side device 20 calculates the distance between the car 6 and the person H. When it is determined that the distance between the car 6 and the person H is shorter than the threshold distance, the landing side device 30 causes the control panel 7 to stop the car 6. At this time, monitoring by a monitor other than the person H is not required. Therefore, the safety of the person H present inside the hoistway 2 can be easily managed.

[0088] Furthermore, as in the past, when a supervisor or the like performs work while monitoring a person present in the pit 2a, the supervisor or the like needs to communicate with the person while performing the work. Therefore, the workability of the work is reduced. According to the present embodiment, since communication for safety management is not required, the reduction in workability can be suppressed.

[0089] In addition, the processing of calculation and determination performed by the car side device 20 may be replaced by the landing side device 30. In this case, the car side device 20 may also send the car side radio wave indicating the information of the reception intensity and phase difference of the human side radio wave to the landing side device 30. Alternatively, the car side device 20 may perform calculations up to the distance X and the reception angle θ, and send the car side radio wave indicating the values ​​of the distance X and the reception angle θ to the landing side device 30. The landing side device 30 may also perform necessary calculations and determinations based on the received car side radio wave.

[0090] In addition, the car side device 20 measures the acceleration. In the safety system 10, based on the height position of the car 6 calculated according to the measured value of the acceleration and the reception intensity of the floor side radio wave received by the car side device 20, the distance X between the car 6 and the person H is corrected to the distance X'. At this time, the distance X is corrected to the distance X' based on the ratio of the first distance A and the second distance B. That is, the distance Y is corrected based on the first distance A and the second distance B. Therefore, the distance between the car 6 and the person H can be calculated more accurately. Specifically, the distance is calculated using the ratio of the first distance to the second distance. As a result, the safety of the safety system 10 can be improved.

[0091] Furthermore, the human-side device 40 notifies the human H of the value of the distance between the car 6 and the human H. Therefore, the human H can perform safety management based on the notified distance.

[0092] In addition, the car-side device 20 is installed on the bottom surface 6a of the car. The landing-side device 30 is installed at the same height as the landing floor 5a of the lowest level. The human-side device 40 is installed on the top of the head of the person H. In this case, the position where the car-side radio wave is transmitted from the car-side device 20 corresponds to the position of the lowest part of the car 6. The position where the landing-side device 30 receives the radio wave and the position where the landing-side radio wave is transmitted corresponds to the height position of the landing floor 5a. The position where the human-side radio wave is transmitted from the human-side device 40 corresponds to the position of the uppermost part of the person H. Therefore, in the safety system 10, the position of the lowermost part of the car 6, the height position of the landing floor 5a, and the position of the uppermost part of the person H can be accurately grasped without performing additional calculations. As a result, the safety of the person H can be further improved.

[0093] Furthermore, in the safety system 10, each action is performed by radio waves transmitted and received by the car side device 20, the landing side device 30, and the person side device 40. Therefore, the safety system 10 can be retrofitted to existing equipment. As a result, it can be applied to a wide range of types and models of elevators.

[0094] In addition, the safety system 10 can also be applied to an elevator system 1 without a machine room and in which the control panel 7 is arranged at the lower part or the upper part of the hoistway 2 .

[0095] In addition, in the safety system 10, the calculation processing performed by the car side device 20 may be calculated by the landing side device 30. In addition, the calculation processing performed by the landing side device 30 may be calculated by the car side device 20. In either case, the car side device 20 and the landing side device 30 provide information to each other by sending or receiving radio waves representing required information.

[0096] Next, use Figure 6 Another example of the calibration method applied in the second operation of the safety system 10 will be described.

[0097] Figure 6 This is a diagram showing an overview of the security system in the first embodiment.

[0098] exist Figure 6 In another example shown, instead of the second distance B in the first example, a third distance B' based on the operation information of the car 6 is used to correct the distance X. For example, the operation information of the car 6 is generated by the control panel 7 based on a signal from a speed governor encoder (not shown).

[0099] In another example, the landing side device 30 obtains information on the height position of the car 6 from the control panel 7. The landing side device 30 transmits a landing side radio wave indicating information on the height position of the car 6 to the car side device 20. The car side device 20 calculates a third distance B′ between the lowest part of the car 6 and the lowest landing floor 5a based on the height position of the car 6 indicated by the landing side radio wave.

[0100] The car-side device 20 uses the third distance B' instead of the second distance B to calculate the distance X' obtained by correcting the distance X. Therefore, the distance Y is corrected based on the third distance B'.

[0101] According to another example of the first embodiment described above, the landing side device 30 obtains the information of the height position of the car 6 obtained from the control panel 7. In the safety system 10, based on the height position of the car 6 obtained from the control panel 7 and the reception intensity of the landing side radio wave received by the car side device 20, the distance X between the car 6 and the person H is corrected to the distance X'. Therefore, the distance between the car 6 and the person H can be calculated more accurately.

[0102] Implementation method 2.

[0103] Figure 7 This is a diagram showing an overview of a security system in the second embodiment. Figure 8 This is a diagram showing a flowchart of the operation of the safety system in Embodiment 2. In addition, the same reference numerals are given to the same or corresponding parts as those in Embodiment 1, and the description of such parts is omitted.

[0104] like Figure 7 As shown, the landing side device 30 calculates the reception angle λ based on the human side radio wave as the direction in which the human side device 40 exists. The landing side device 30 determines whether the human side device 40 exists at a position lower than the lowest landing floor 5a based on the reception angle λ.

[0105] Specifically, the landing side device 30 calculates the reception angle λ based on the direction in which the person-side device 40 exists, and the reception angle λ is the elevation angle of the person-side device 40 when the plane including the landing side device 30 and perpendicular to the horizontal direction is used as the reference plane. In addition, the reception angle λ can also be defined as the angle formed by the line segment connecting the landing side device 30 and the person-side device 40 relative to the reference axis oriented in the vertical direction and passing through the landing side device 30.

[0106] The landing side device 30 determines whether the reception angle λ is less than 90°. When the landing side device 30 determines that the reception angle λ is less than 90°, it determines that the position of the person-side device 40, i.e., the position of the person H, exists at a position lower than the landing side device 30 itself, i.e., lower than the landing floor 5a of the lowest floor. When the landing side device 30 determines that the reception angle λ is greater than 90°, it determines that the position of the person-side device 40, i.e., the position of the person H, exists at the same height as the landing floor 5a of the lowest floor or at a position higher than the landing floor 5a. Here, the landing side device 30 may regard the position of the person-side device 40 as the height position of the top of the head of the person H. Alternatively, the landing side device 30 may calculate the height position of the top of the head of the person H based on the position of the person-side device 40.

[0107] When determining that the reception angle λ is equal to or larger than 90°, the landing-side device 30 transmits a command to the control panel 7 to operate at a low speed that is slower than the normal operating speed.

[0108] When the landing side device 30 determines that the receiving angle λ is less than 90°, it sends a command to the control panel 7 to run at the normal running speed. In terms of safety management, the car 6 is controlled to temporarily stop when it reaches the landing floor 5a of the lowest floor when moving downward. Therefore, when the human side device 40 is located at a position lower than the landing floor 5a of the lowest floor, even if the car 6 runs at the normal running speed, the safety of the person H present in the pit 2a can be ensured.

[0109] Figure 8 The flowchart shown starts at an arbitrary timing.

[0110] In step S101, the human-side device 40 transmits a human-side radio wave, and the landing-side device 30 receives the human-side radio wave.

[0111] Then, the operation of step S102 is performed. In step S102, the hall-side device 30 calculates the reception angle λ.

[0112] Then, the operation of step S103 is performed. In step S103, the hall-side device 30 determines whether the reception angle λ is smaller than 90°.

[0113] If it is determined in step S103 that the reception angle λ is less than 90°, the operation of step S104 is performed. In step S104, the landing side device 30 sends a command to the control panel 7 to operate at a normal operating speed. In step S104, the landing side device 30 may end without sending the command.

[0114] Then, the actions of the flowchart end.

[0115] When it is determined in step S103 that the reception angle λ is equal to or greater than 90°, the operation of step S105 is performed. In step S105, the landing-side device 30 transmits a command to the control panel 7 to operate at a low speed slower than the normal operating speed.

[0116] Then, the actions of the flowchart end.

[0117] According to the second embodiment described above, the landing side device 30 sends a command related to the running speed of the car 6 to the control panel 7 according to the reception angle of the radio wave on the human side. Specifically, in the past, when working in the pit 2a, the car 6 was operated at a low speed slower than the normal running speed. In this embodiment, when the person H is present at a position lower than the landing floor 5a, the car 6 can be operated at the normal running speed because the safety is ensured. Therefore, it is possible to suppress the reduction in the working efficiency of the maintenance work. That is, in the safety system 10, the safety of the person H can be ensured without deteriorating the workability of the maintenance.

[0118] In addition, the landing side device 30 may determine whether the person-side device 40 is located at a position lower than the landing side device 30 based on the reception angle λ′ which is the elevation angle of the person-side device 40 with respect to the horizontal plane including the landing side device 30 as a reference plane, instead of the reception angle λ. In this case, the relationship of the following formula (3) is satisfied between the reception angle λ′ and the reception angle λ.

[0119] λ′=90°-λ (3)

[0120] Implementation method 3.

[0121] Fig. 9 This is a diagram showing an outline of a security system in Embodiment 3. In addition, the same reference numerals are given to the same or corresponding parts as those in Embodiment 1 or Embodiment 2. The description of such parts will be omitted.

[0122] like Fig. 9 As shown, in Embodiment 3, the landing side device 30 receives a radio wave indicating the value of the reception angle θ from the car side device 20. The landing side device 30 calculates the height position of the human side device 40 using the reception angle θ and the reception angle λ. Fig. 9 As shown, based on the reception angle θ and the reception angle λ, the height position of the human-side device 40 can be uniquely calculated from the geometric relationship.

[0123] The landing side device 30 obtains operation information including the lifting direction of the car 6, the height position of the car 6, and the lifting speed of the car 6 from the control panel 7. The landing side device 30 calculates the grace time until the car 6 contacts the person H when the car 6 continues to move based on the operation information and the information on the height position of the person-side device 40. Specifically, the landing side device 30 calculates the distance between the bottom surface 6a of the car and the person H based on the height position of the car 6 and the height position of the person-side device 40. The landing side device 30 calculates the grace time until the car 6 contacts the person H by dividing the distance between the bottom surface 6a of the car and the person H by the lifting speed of the car 6. In addition, in this calculation, it is also possible to assume that the lifting speed of the car 6 takes a fixed value.

[0124] For example, the landing side device 30 transmits a landing side radio wave indicating the grace time, and the person side device 40 receives the landing side radio wave indicating the grace time. The person side device 40 notifies the person H of the grace time by voice based on the landing side radio wave, thereby calling attention.

[0125] Furthermore, the landing-side device 30 may perform an operation to stop the car 6 when the margin time is shorter than a predetermined threshold time.

[0126] In addition, the same calculation may be performed by the car-side device 20 instead of the landing-side device 30. In this case, the car-side device 20 receives a radio wave indicating the value of the reception angle λ from the landing-side device 30.

[0127] According to the third embodiment described above, the car side device 20 or the landing side device 30 calculates the height position where the person H exists based on the reception angle θ and the reception angle λ. In this case, it is not necessary to use the information on the reception intensity of the radio wave on the person side. Therefore, according to the conditions under which the car side device 20 and the landing side device 30 receive the radio wave, the height position where the person H exists can be calculated more accurately.

[0128] Furthermore, the car-side device 20 or the landing-side device 30 calculates the margin time. The human-side device 40 notifies the human H of the margin time. Therefore, the human H can be informed of the danger of contact with the car 6. As a result, safety can be improved.

[0129] Industrial Applicability

[0130] As described above, the safety system of the present invention can be used in an elevator system.

[0131] Description of symbols

[0132] 1: Elevator system; 2: Hoistway; 2a: Pit; 3: Building; 4: Floor; 4a: Bottom floor; 4b: Upper floor; 5: Floor; 5a: Bottom floor; 5b: 2nd floor; 6: Car; 6a: Car bottom; 7: Control panel; 10: Safety system; 20: Car side device; 21: Radio wave unit; 22: Detection unit; 23: Operation unit; 30: Floor device; 31: Radio wave unit; 32: Communication unit; 33: Command unit; 34: Operation unit; 40: Person side device; 41: Radio wave unit; 42: Notification unit; H: Person.

Claims

1. A security system, wherein: The safety system has: A car-side device, which is installed in the elevator car, transmits car-side radio waves, and detects the receiving intensity and receiving angle of the received radio waves; a landing side device installed at a height position of a lowest landing inside the hoistway of the elevator, transmitting a landing side radio wave and detecting a receiving intensity and a receiving angle of the received radio wave; and A human side device is installed on a person existing inside the shaft and transmits human side radio waves. The car side device or the landing side device determines whether the distance between the car and the person is shorter than a threshold distance based on the reception intensity of the person-side radio wave received by the car side device and the reception angle of the person-side radio wave, When it is determined that the distance between the car and the person is shorter than the threshold distance, the floor station side device causes the elevator control panel to stop the car. When it is determined that the distance between the car and the person is the same as the threshold distance or longer than the threshold distance, the floor station side device does not stop the car.

2. The security system according to claim 1, wherein: The car-side device measures acceleration and calculates the height position of the car based on the measured acceleration. The car-side device or the landing-side device corrects the value of the distance between the car and the person based on the reception intensity of the landing-side radio wave received by the car-side device and the height position of the car calculated by the car-side device.

3. The security system according to claim 2, wherein: The car side device or the floor station side device calculates the first distance between the car and the lowest floor station based on the reception strength of the floor station side radio wave received by the car side device, calculates the second distance between the car and the lowest floor station according to the height position of the car based on the acceleration calculated by the car side device, and uses the ratio of the first distance to the second distance to correct the value of the distance between the car and the person.

4. The security system according to claim 1, wherein: The car-side device calculates a first distance between the car and the lowermost landing based on the reception intensity of the landing-side radio wave, The landing side device receives information on the height position of the car from the control panel, The car side device or the floor station side device calculates the third distance between the car and the lowest floor station based on the information of the height position of the car obtained by the floor station side device from the control panel, and corrects the value of the distance between the car and the person based on the first distance and the third distance.

5. The safety system according to any one of claims 1 to 4, wherein: The person-side device notifies the person of the distance between the car and the person calculated by the car-side device or the landing-side device.

6. The safety system according to any one of claims 1 to 5, wherein: The landing side device determines whether the person is located at a position lower than the height of the lowest landing based on the reception angle of the radio wave on the person side, When the landing side device determines that the person is present at a position lower than the height of the lowest landing, the control panel operates the car at a normal operating speed. The landing-side device causes the control panel to operate the car at a speed slower than the normal operating speed when it is determined that the person is present at a position at the same height as the lowermost landing or at a position higher than the lowermost landing.

7. The safety system according to any one of claims 1 to 6, wherein: The car-side device or the landing-side device calculates the height at which the person exists based on the reception angle of the person-side radio wave received by the car-side device and the reception angle of the radio wave received by the landing-side device.

8. The security system according to claim 7, wherein: The car-side device or the landing-side device calculates a grace period until the car contacts the person based on operation information and information on the height at which the person is present, wherein the operation information includes the height position of the car and the lifting speed of the car calculated by the control panel, The human-side device notifies the calculated grace time to the human.

9. The safety system according to any one of claims 1 to 8, wherein: The car side device is installed on the bottom surface of the car, The landing side device is installed inside the hoistway at the same height as the floor of the lowermost landing. The person-side device is installed on the top of the person's head.

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