Determination device, determination method, and determination program

Abstract

To detect an error in a stepladder installation direction or an error in an operation direction.SOLUTION: A determination device acquires a center of gravity trajectory in a static state of an operator on a stepladder before work starts. The determination device acquires a ratio r(Δy / Δx) of an amplitude Δx in an x direction of the acquired center of gravity trajectory and an amplitude Δy in a y direction. After the operator starts working, the determination device acquires a center of gravity trajectory during work by the operator on the stepladder. The determination device acquires ratio r'(Δy' / Δx') of an amplitude Δx' in the x direction of the acquired center of gravity trajectory and an amplitude Δy' in the y direction. When the determination device determines ratio r(Δy / Δx)>ratio r'(Δy' / Δx'), an alarm to the effect that there is an error in a stepladder installation direction or an error in an operation direction is issued.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a determination device, a determination method, and a determination program for detecting an incorrect installation direction of a stepladder or an incorrect working direction. [Background technology]

[0002] Conventionally, there are techniques for preventing accidents such as falls of workers working on stepladders. For example, there is a technique that uses weight sensors attached to the four legs of a stepladder to capture the movement of the center of gravity of a worker working on the stepladder, and outputs an alarm when the amplitude of the movement of the center of gravity exceeds a predetermined threshold. There is also a technique that sets a threshold value for the amplitude of the movement of the center of gravity, taking into account the balancing ability of the worker (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-172760 A Summary of the Invention [Problem to be solved by the invention]

[0004] For example, if the direction of the rotation axis of a stepladder is the x-direction and the horizontal direction perpendicular to the x-direction is the y-direction, a worker working on a stepladder is more likely to fall in the x-direction than in the y-direction. Therefore, when a worker works on a stepladder, it is preferable to set up the stepladder so that the working direction is not in the x-direction, or to work in such a way that the working direction is not in the x-direction.

[0005] However, there has been no technology to detect the wrong direction of a stepladder or the wrong direction of work in the past. Therefore, it has not been possible to accurately detect the signs of a stepladder falling over while working on it. Therefore, the present invention aims to detect the wrong direction of a stepladder or the wrong direction of work. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention is characterized in that it includes a first calculation unit that defines the direction of the rotation axis of a stepladder as an x-direction and a y-direction as a horizontal direction perpendicular to the x-direction, acquires a trajectory of center of gravity sway of a worker standing on the stepladder before starting work, and calculates a ratio of an amplitude in the x-direction to an amplitude in the y-direction in the acquired trajectory of center of gravity sway, acquires a trajectory of center of gravity sway of the worker standing on the stepladder while working, and calculates a ratio of an amplitude in the x-direction to an amplitude in the y-direction in the acquired trajectory of center of gravity sway, a determination unit that determines whether the ratio of the amplitude in the x-direction of the worker calculated by the second calculation unit is greater than the ratio of the amplitude in the x-direction of the worker calculated by the first calculation unit, and an output processing unit that outputs an alarm indicating that an error has occurred in the installation direction of the stepladder or an error in the working direction when the ratio of the amplitude in the x-direction of the worker calculated by the second calculation unit is greater than the ratio of the amplitude in the x-direction of the worker calculated by the first calculation unit. Effect of the Invention

[0007] According to the present invention, it is possible to detect an incorrect installation direction of a stepladder or an incorrect working direction. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram for explaining the x and y directions in this embodiment. [Diagram 2] FIG. 2 is a diagram showing an example of a trajectory of the center of gravity of a worker. [Diagram 3] FIG. 3 is a diagram illustrating an example of the configuration of the determination system. [Figure 4] FIG. 4 is a flowchart illustrating an example of a preliminary measurement process executed by the determination device. [Diagram 5] FIG. 5 is a flowchart showing an example of a measurement process during work executed by the determination device. [Figure 6] FIG. 6 is a diagram illustrating an example of the configuration of a computer that executes a determination program. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a mode (embodiment) for carrying out the present invention will be described with reference to the drawings, but the present invention is not limited to the present embodiment.

[0010] [overview] First, an overview of a determination device 10 of this embodiment will be described with reference to Figures 1 and 2. In the following description, the direction of the rotation axis of the stepladder is defined as the x direction, and the horizontal direction perpendicular to the x direction is defined as the y direction.

[0011] As mentioned above, workers working on a stepladder tend to fall more easily in the x direction than in the y direction. Therefore, as shown in Figure 1, it is considered safer for workers if the stepladder is set up so that the work target is in the y direction (+y direction) (= the stepladder is set up in the correct direction).

[0012] Here, the determination device 10 measures the trajectory of the center of gravity when a worker works on a stepladder, for example, from a weight sensor or the like installed on each leg of the stepladder.

[0013] For example, when the maximum amplitude of the trajectory of the center of gravity of the worker is long in the y direction as shown by reference numeral 201 in Fig. 2, it is considered that it is safe for the worker (= the stepladder is installed in the correct direction). On the other hand, when the maximum amplitude of the trajectory of the center of gravity of the worker is long in the x direction as shown by reference numeral 202, it is considered that it is not safe for the worker (= the stepladder is installed in the wrong direction).

[0014] However, simply judging whether the maximum amplitude in the x direction of the center of gravity trajectory is greater than the maximum amplitude in the y direction of the center of gravity trajectory does not take into account various conditions, such as the balance ability characteristics based on the physical ability and physical condition of the individual worker, the foothold shape of the ladder, and support of the body position by leaning on the shins.

[0015] Therefore, in order to take the above conditions into consideration, the determination device 10 acquires Δx (e.g., maximum amplitude in the x direction) and Δy (e.g., maximum amplitude in the y direction) of the center of gravity trajectory when the worker is standing on the stepladder (stationary state) before starting work (see Patent Document 1). Then, the determination device 10 calculates the ratio r (e.g., Δy / Δx) between Δx and Δy. The above ratio r can be considered to be a value that reflects the individual characteristics of the worker and the characteristics of the stepladder. Below, an example will be described in which the ratio r=Δy / Δx and the ratio r'=Δy' / Δx'.

[0016] After the worker starts working, the determination device 10 acquires Δx' and Δy' at predetermined intervals. Then, using the acquired Δx' and Δy', it calculates the amplitude ratio r' (Δy' / Δx') while the worker is working. If the ratio r' while working is smaller than the amplitude ratio r before the work started, it is understood that the situation is one in which the vibration in the lateral direction (x direction) is large. In other words, it is presumed that the installation direction of the stepladder is incorrect, or the working direction is incorrect. Therefore, when the determination device 10 determines that the ratio r>r', it outputs a warning to the worker that the installation direction of the stepladder is incorrect, or the working direction is incorrect.

[0017] This allows the determination device 10 to notify the worker that the stepladder is installed in the wrong direction or that the worker is working in the wrong direction, thereby preventing accidents such as the worker falling over while working on the stepladder.

[0018] [Configuration example] Next, a configuration example of the determination system will be described with reference to Fig. 3. The determination system includes a sensor 22, a stepladder 20, and a determination device 10.

[0019] The sensors 22 collect time-series data on the position of the center of gravity of a worker working on the stepladder 20. The sensors 22 are, for example, distributed over the legs of the stepladder 20. Each sensor 22 is, for example, a distortion sensor capable of measuring weight. When the worker stands on the stepladder 20, each sensor 22 generates and outputs a sensor value according to the magnitude of distortion. The sensors 22 transmit the sensor value to the determination device 10 via wire or wirelessly.

[0020] The determination device 10 can obtain time-series data regarding the center of gravity position of the worker standing on the stepladder 20 by continuously receiving sensor values ​​from the four sensors 22 at predetermined intervals. The number of sensors 22 is not limited to four, and may be three or more. If the number of sensors 22 is three or more, it is possible to detect a change in the center of gravity of the worker.

[0021] The stepladder 20 may be any equipment used when a worker stands on the equipment and works at a position higher than the ground, such as a step stool, tripod, work platform, scaffolding, etc. Alternatively, instead of the stepladder 20 and the sensor 22, a center of gravity stabilometer with a built-in sensor may be used.

[0022] [Judgment device] The determination device 10 includes, for example, an input / output unit 11, a storage unit 12, and a control unit 13. The input / output unit 11 is an interface that controls input and output of various data. The input / output unit 11 receives, for example, a sensor value input from a sensor 22 and outputs an alarm generated by the control unit 13.

[0023] The storage unit 12 stores data, programs, etc. referenced when the control unit 13 executes various processes. The storage unit 12 is realized by a semiconductor memory element such as a random access memory (RAM) or a flash memory, or a storage device such as a hard disk or an optical disk. For example, the storage unit 12 includes an a priori ratio DB that stores the a priori ratio r calculated by the control unit 13, etc.

[0024] The control unit 13 is responsible for controlling the entire determination device 10. The functions of the control unit 13 are realized, for example, by a CPU (Central Processing Unit) executing a program stored in the storage unit 12.

[0025] The control unit 13 includes, for example, a measurement pattern setting unit 131, a data acquisition unit 132, a first calculation unit 133, a second calculation unit 134, a determination unit 135, and an output processing unit 136.

[0026] The measurement pattern setting unit 131 accepts setting input of a measurement pattern (pre-measurement or measurement during work) from a user, and sets it in the determination device 10. In addition to the measurement pattern, the measurement pattern setting unit 131 also accepts setting input of the ID of the worker to be measured, the date of measurement, and the like.

[0027] The data acquiring unit 132 acquires time series data on the position of the center of gravity of the worker from the sensor 22. For example, the data acquiring unit 132 acquires from the sensor 22 time series data on the position of the center of gravity of the worker before the start of work and during work.

[0028] The first calculation unit 133 acquires time series data of the center of gravity position of the worker before starting the work (time series data of the center of gravity position of the worker in advance measurement) from the data acquisition unit 132. Then, the first calculation unit 133 obtains a trajectory of the center of gravity sway using the obtained time series data of the center of gravity position. After that, the first calculation unit 133 calculates a ratio (first ratio) between the amplitude in the x direction and the amplitude in the y direction of the obtained trajectory of the center of gravity sway.

[0029] For example, the first calculation unit 133 measures Δx (e.g., maximum amplitude in the x direction) and Δy (e.g., maximum amplitude in the y direction) of the worker's center of gravity trajectory. Then, the first calculation unit 133 calculates a ratio r between Δx and Δy (e.g., Δy / Δx). After that, the first calculation unit 133 associates the calculated ratio r with the worker's ID and date, and stores it in the pre-ratio DB.

[0030] The second calculation unit 134 acquires time-series data of the center of gravity position of the worker during work from the data acquisition unit 132. Then, the second calculation unit 134 obtains a trajectory of the center of gravity sway using the acquired time-series data of the center of gravity position. After that, the second calculation unit 134 calculates a ratio (second ratio) between the amplitude in the x direction and the amplitude in the y direction of the trajectory of the center of gravity sway.

[0031] For example, the second calculation unit 134 acquires Δx' (e.g., maximum amplitude in the x direction) and Δy' (e.g., maximum amplitude in the y direction) of the trajectory of the worker's center of gravity sway during work. Then, the second calculation unit 134 calculates a ratio r' (e.g., Δy' / Δx') between Δx' and Δy'. The second calculation unit 134 executes the above process at predetermined time intervals (e.g., every 30 seconds).

[0032] The judgment unit 135 judges whether the ratio of the x-direction amplitude of the center of gravity trajectory of the worker calculated by the second calculation unit 134 (the ratio of the x-direction amplitude during work) is greater than the ratio of the x-direction amplitude of the center of gravity trajectory of the worker calculated by the first calculation unit 133 (the ratio of the x-direction amplitude before work starts).

[0033] For example, when the second calculation unit 134 calculates the ratio r' (e.g., Δy' / Δx') during work by worker A, the determination unit 135 reads out the ratio r (Δy / Δx) of worker A on the most recent date from the pre-ratio DB. Then, the determination unit 135 compares the ratio r (Δy / Δx) of worker A on the most recent date with the ratio r' (Δy' / Δx') of worker A, and determines whether ratio r>ratio r'.

[0034] When the judgment unit 135 judges that the ratio of the x-direction amplitude of the center of gravity trajectory of the worker during work is greater than the ratio of the x-direction amplitude of the center of gravity trajectory of the worker before work starts, the output processing unit 136 outputs an alarm indicating that the ladder is installed in the wrong direction or the work direction is wrong.

[0035] For example, when the determining unit 135 determines that the ratio r>the ratio r', the output processing unit 136 outputs a warning that an error has occurred in the installation direction of the stepladder or an error has occurred in the working direction.

[0036] This allows the worker to know that the stepladder is installed in the wrong direction or that the working direction is wrong, thereby preventing accidents such as falls while working with the stepladder.

[0037] [Example of processing procedure] [Pre-measurement] Next, an example of a processing procedure executed by the determination device 10 will be described with reference to Fig. 4 and Fig. 5. First, an example of a preliminary measurement process executed by the determination device 10 will be described with reference to Fig. 4. It is assumed that the measurement pattern setting unit 131 has already received the setting input for the preliminary measurement, and the worker is standing on the stepladder and is in a state before starting work.

[0038] The data acquisition unit 132 of the determination device 10 acquires time-series data on the position of the center of gravity of the worker from each sensor 22. Then, the first calculation unit 133 obtains a trajectory of the center of gravity sway of the worker based on the acquired time-series data, and acquires Δx (e.g., maximum amplitude in the x direction) and Δy (e.g., maximum amplitude in the y direction) on the trajectory of the center of gravity sway (S1).

[0039] The first calculation unit 133 calculates the ratio r (Δy / Δx) of the worker's center of gravity fluctuation using Δx and Δy acquired in S1 (S2). Then, the first calculation unit 133 stores the calculated ratio r of the worker's center of gravity fluctuation in a pre-ratio DB together with the worker's ID and date (S3: DB storage).

[0040] [Measurements during work] After that, the user sets a measurement pattern (measurement during work) in the measurement pattern setting unit 131 of the determination device 10. After that, the worker starts work while standing on the stepladder. Then, the determination device 10 starts the measurement process during work. An example of the measurement process during work executed by the determination device 10 will be described with reference to FIG. 5.

[0041] First, the data acquiring unit 132 acquires time-series data on the position of the center of gravity of the worker while working from each sensor 22. Then, the second calculating unit 134 obtains the trajectory of the worker's center of gravity sway based on the acquired time-series data, and acquires Δx' (e.g., maximum amplitude in the x direction) and Δy' (e.g., maximum amplitude in the y direction) on the trajectory of the center of gravity sway (S11).

[0042] The second calculation unit 134 calculates the ratio r' (Δy' / Δx') of the trajectory of the operator's center of gravity sway using Δx' and Δy' acquired in S11 (S12).

[0043] The judgment unit 135 judges whether the ratio r'(Δy' / Δx') of the trajectory of the worker's center of gravity fluctuation during work calculated in S12 is smaller than the ratio r(Δy / Δx) of the trajectory of the worker's center of gravity fluctuation before starting work (S13).

[0044] Here, if the judgment unit 135 determines that the ratio r'(Δy' / Δx') of the trajectory of the worker's center of gravity sway while working is smaller than the ratio r(Δy / Δx) of the trajectory of the worker's center of gravity sway before starting work (Yes in S13), it outputs an alarm to the effect that the ladder is installed in the wrong direction or the working direction is incorrect (S14).

[0045] On the other hand, when the determination unit 135 determines that the ratio r'(Δy' / Δx') of the trajectory of the worker's center of gravity sway is equal to or greater than the ratio r(Δy / Δx) of the trajectory of the worker's center of gravity sway (No in S13), the process returns to S11.

[0046] By executing the above process, the determination device 10 can notify the worker that the stepladder is installed in the wrong direction or that the working direction is wrong. As a result, accidents such as falls during work using the stepladder can be prevented.

[0047] In the above embodiment, the ratio r=Δy / Δx between Δx and Δy in the trajectory of the worker's center of gravity sway may be Δx / Δy. If the ratio r=Δx / Δy and the determination unit 135 determines that the ratio r(Δx / Δy)<ratio r'(Δx' / Δy'), the determination unit 135 outputs a warning that the ladder is installed in an incorrect direction or that the work direction is incorrect.

[0048] In addition, although an example has been described in which Δx and Δy are the maximum amplitude in the x direction and the maximum amplitude in the y direction, respectively, in the trajectory of the center of gravity sway, they may be the average of the amplitude in the x direction, the average of the amplitude in the y direction, or the like.

[0049] [System configuration, etc.] In addition, each component of each unit shown in the figure is a functional concept, and does not necessarily have to be physically configured as shown in the figure. In other words, the specific form of distribution and integration of each device is not limited to that shown in the figure, and all or a part of it can be functionally or physically distributed and integrated in any unit according to various loads, usage conditions, etc. Furthermore, each processing function performed by each device can be realized in whole or in part by a CPU and a program executed by the CPU, or can be realized as hardware using wired logic.

[0050] Furthermore, among the processes described in the above embodiments, all or part of the processes described as being performed automatically can be performed manually, or all or part of the processes described as being performed manually can be performed automatically by a known method. In addition, the information including the processing procedures, control procedures, specific names, various data and parameters shown in the above documents and drawings can be changed arbitrarily unless otherwise specified.

[0051] [program] The above-mentioned determination device 10 can be implemented by installing a program (determination program) as package software or online software on a desired computer. For example, by executing the above-mentioned program on an information processing device, the information processing device can function as the determination device 10. The information processing device referred to here includes mobile communication terminals such as smartphones, mobile phones, and PHS (Personal Handyphone System), and further terminals such as PDA (Personal Digital Assistant), etc.

[0052] 6 is a diagram showing an example of the configuration of a computer that executes a determination program. The computer 1000 includes, for example, a memory 1010 and a CPU 1020. The computer 1000 also includes a hard disk drive interface 1030, a disk drive interface 1040, a serial port interface 1050, a video adapter 1060, and a network interface 1070. These components are connected by a bus 1080.

[0053] The memory 1010 includes a read only memory (ROM) 1011 and a random access memory (RAM) 1012. The ROM 1011 stores a boot program such as a basic input output system (BIOS). The hard disk drive interface 1030 is connected to a hard disk drive 1090. The disk drive interface 1040 is connected to a disk drive 1100. A removable storage medium such as a magnetic disk or an optical disk is inserted into the disk drive 1100. The serial port interface 1050 is connected to a mouse 1110 and a keyboard 1120, for example. The video adapter 1060 is connected to a display 1130, for example.

[0054] The hard disk drive 1090 stores, for example, an OS 1091, an application program 1092, a program module 1093, and program data 1094. That is, a program that defines each process executed by the above-mentioned determination device 10 is implemented as a program module 1093 in which computer-executable code is written. The program module 1093 is stored, for example, in the hard disk drive 1090. For example, a program module 1093 for executing a process similar to the functional configuration of the determination device 10 is stored in the hard disk drive 1090. The hard disk drive 1090 may be replaced by an SSD (Solid State Drive).

[0055] Data used in the processing of the above-described embodiment is stored as program data 1094 in, for example, the memory 1010 or the hard disk drive 1090. Then, the CPU 1020 reads out the program module 1093 or the program data 1094 stored in the memory 1010 or the hard disk drive 1090 into the RAM 1012 as necessary and executes them.

[0056] Note that the program module 1093 and the program data 1094 are not limited to being stored in the hard disk drive 1090, but may be stored in, for example, a removable storage medium and read by the CPU 1020 via the disk drive 1100 or the like. Alternatively, the program module 1093 and the program data 1094 may be stored in another computer connected via a network (such as a local area network (LAN) or wide area network (WAN)). The program module 1093 and the program data 1094 may then be read by the CPU 1020 from the other computer via the network interface 1070. [Explanation of symbols]

[0057] 10 Judgment device 11 Input / output section 12 Storage section 13 Control section 131 Measurement pattern setting section 132 Data Acquisition Section 133 First Calculation Section 134 Second Calculation Section 135 Judgment section 136 Output Processing Section

Claims

1. a first calculation unit which defines the direction of the rotation axis of the stepladder as an x-direction, defines the horizontal direction perpendicular to the x-direction as a y-direction, acquires a trajectory of the center of gravity sway of a worker standing on the stepladder before starting work, and calculates a ratio of an amplitude in the x-direction to an amplitude in the y-direction of the acquired trajectory of the center of gravity sway; a second calculation unit that acquires a trajectory of center of gravity sway of the worker standing on the stepladder while working, and calculates a ratio of an x-direction amplitude to a y-direction amplitude in the acquired trajectory of center of gravity sway; a determination unit that determines whether or not the ratio of the amplitude of the x-direction of the worker calculated by the second calculation unit is greater than the ratio of the amplitude of the x-direction of the worker calculated by the first calculation unit; an output processing unit that outputs a warning that an error in the installation direction of the stepladder or an error in the working direction has occurred when the ratio of the amplitude in the x direction of the worker calculated by the second calculation unit is greater than the ratio of the amplitude in the x direction of the worker calculated by the first calculation unit; A determination device comprising:

2. The amplitude in the x direction of the trajectory of the center of gravity sway is the maximum amplitude in the x direction of the trajectory of the center of gravity sway, and the amplitude in the y direction of the trajectory of the center of gravity sway is the maximum amplitude in the y direction of the trajectory of the center of gravity sway.

2. The determination device according to claim 1.

3. a storage unit that stores the ratio of the amplitude in the x direction to the amplitude in the y direction of the worker calculated by the first calculation unit in association with identification information of the worker and a date; The determination unit is The determination is made using the ratio of the x-direction amplitude to the y-direction amplitude of the worker stored in the storage unit on the latest date. The determination device according to claim 1 .

4. A determination method executed by a determination device, comprising: a first calculation step of determining a direction of a rotation axis of a stepladder as an x-direction, a horizontal direction perpendicular to the x-direction as a y-direction, acquiring a trajectory of a center of gravity sway of a worker standing on the stepladder before starting work, and calculating a ratio of an amplitude in the x-direction to an amplitude in the y-direction in the acquired trajectory of center of gravity sway; a second calculation step of acquiring a trajectory of center of gravity sway of the worker standing on the stepladder while working, and calculating a ratio of an amplitude in an x ​​direction to an amplitude in a y direction in the acquired trajectory of center of gravity sway; determining whether the ratio of the amplitude of the x-direction of the worker calculated in the second calculation step is greater than the ratio of the amplitude of the x-direction of the worker calculated in the first calculation step; a step of outputting a warning indicating that an error in the installation direction of the stepladder or an error in the working direction has occurred when the ratio of the amplitude of the x direction of the worker calculated in the second calculation step is greater than the ratio of the amplitude of the x direction of the worker calculated in the first calculation step; A method for determining whether or not a particular

5. a first calculation step of determining a direction of a rotation axis of a stepladder as an x-direction, a horizontal direction perpendicular to the x-direction as a y-direction, acquiring a trajectory of a center of gravity sway of a worker standing on the stepladder before starting work, and calculating a ratio of an amplitude in the x-direction to an amplitude in the y-direction in the acquired trajectory of center of gravity sway; a second calculation step of acquiring a trajectory of center of gravity sway of the worker standing on the stepladder while working, and calculating a ratio of an amplitude in an x ​​direction to an amplitude in a y direction in the acquired trajectory of center of gravity sway; determining whether the ratio of the amplitude of the x-direction of the worker calculated in the second calculation step is greater than the ratio of the amplitude of the x-direction of the worker calculated in the first calculation step; a step of outputting a warning indicating that an error in the installation direction of the stepladder or an error in the working direction has occurred when the ratio of the amplitude of the x direction of the worker calculated in the second calculation step is greater than the ratio of the amplitude of the x direction of the worker calculated in the first calculation step; A judgment program for causing a computer to execute the above.

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