JP6862083B2 - Forgetting to tighten prevention system - Google Patents

Description

The present invention relates to a technique for preventing forgetting to tighten the fastener.

In the ground improvement work such as the runway in service, a large number of holes having a diameter of about 200 mm are drilled in the pavement slab at intervals of about 1 m, and a chemical solution or the like is injected through the holes. A protective cap is installed in the hole in case the runway is temporarily released during the ground improvement work. The protective cap includes a tubular main body in contact with the hole wall, a lid covering the upper part of the main body, and a fastener consisting of bolts and nuts for fixing the lid to the main body. A torque wrench is used to tighten the fasteners, as the lid may come off during service on the runway, which could lead to a serious accident. However, since the number of protective caps may reach several hundreds and the tightening work needs to be completed in a short time, there is a concern that the tightening may be forgotten.

Techniques for torque management of fasteners tightened with a torque wrench are disclosed in the following patent documents. The tightening data management system described in Patent Document 1 completes the tightening work with the torque wrench by displaying a list of torque measurement values received from the torque wrench in real time on the monitor of the tightening data management device. It is configured to allow the operator to check the tightened state of the bolt. In the technique described in Patent Document 2, the joint number (bar code) of the flange portion is read by a bar code reader, input to the worker management terminal via the wireless unit, and when the tightening of one bolt is completed, the tool ID code and the tool ID code and A tightening completion signal is transmitted from the torque wrench and input to the worker management terminal. The worker management terminal outputs these signals to the data entry terminal. The work place management computer counts the number of times the work data output to the data entry terminal is input for each tightening completion signal input, and determines whether or not this count value is the total number of bolts on the flange for each tool. When it is determined that the count value has reached the total number of bolts, it means that all the work at the work position has been completed.

Japanese Unexamined Patent Publication No. 2006-320984 Japanese Unexamined Patent Publication No. 7-105469

However, in the technique of Patent Document 1, since it is necessary for the worker to identify the bolt tightened with the torque wrench, there is a possibility that the identification error may occur. In the technique of Patent Document 2, a worker reads a barcode with a barcode reader.
Therefore, the present invention provides a technique capable of identifying a fastener without performing work for identifying the fastener to be tightened with a torque wrench.

The present invention, worker, forgetting tightening the tightening operation to perform fastening by the fastener to sequentially move the object of the moved position to the position of each of the plurality of objects which are spaced apart from each other It is a system for preventing forgetting to tighten, and is equipped with a torque wrench used by the worker to tighten the object and a display device. The torque wrench has a specified value of torque when the fastener is tightened. The specified torque detection means for detecting that the torque has been reached, the acquisition means for acquiring the position information by receiving a signal from the GNSS navigation satellite and calculating the position of the own device based on the signal, and the acquisition means. When the position information is acquired, the position information is transmitted to the display device, and when the specified torque detecting means detects that the torque has reached the specified value, the detection signal is transmitted to the display device. the display device includes receiving means for receiving a detection known signal and position information transmitted from the torque wrench after begin the tightening, for each of a plurality of objects at different positions from each other, the subject a storage means for storing position information of the tightening device for tightening the goods, and the position information of the torque wrench received by the receiving unit, based on the position information of the fastener that the storage means stores , identifying means for identifying fasteners that are within the distance between the torque wrench has been determined, the fastener of the identification means has identified on the basis of the first position information before SL received by the receiving means, wherein Ri said identification means is identical der and fasteners that identified based on the second positional information received by the receiving unit after a predetermined time of the first position information, and fasteners for fastening an object Provided is a tightening forgetting prevention system having a display means for displaying that the tightening work of the object has been completed when it is determined that the same number of detection signals as the number of the detection signals have been received .

According to the present invention, the tightening tool can be identified without performing the work for identifying the tightening tool to be tightened with the torque wrench.

The figure which shows the management system which concerns on embodiment. The figure which shows the appearance of the torque wrench 1. The figure which shows the electrical structure of the torque wrench 1. The figure which shows the electrical composition of a tablet PC3. The figure which shows the work DB. The figure which shows the menu screen. The flow chart which shows the operation of a tablet PC3. The figure which shows the example of the screen. The figure which shows the example of the screen. The figure which shows the example of the screen. The figure which shows the display example of the work result. Flow diagram of a modified example.

An example of a mode for carrying out the present invention will be described.
<Structure>
FIG. 1 is a diagram showing a management system according to an embodiment. This management system includes a torque wrench 1, a tablet PC (personal computer) 3, a USB (Universal Serial Bus) memory 5, and a PC 6. The tablet PC 3 is an example of a display device according to the present invention.

FIG. 2 is a diagram showing the appearance of the torque wrench 1. (A) is a plan view, and (b) is a side view. The torque wrench 1 is a tool for tightening a fastener. The fastener is, for example, a bolt or nut for tightening the lid of the protective cap provided on the runway to the main body. The torque wrench 1 includes a grip portion 11, a shaft 12, a head 13, a wireless communication unit 14, a position information acquisition unit 15, and a data processing unit 20. A grip portion 11 is provided at one end of the shaft 12, and a head 13 is provided at the other end of the shaft 12. A data processing unit 20 and a wireless communication unit 14 are provided in the central portion of the shaft 12. The head 13 is provided with a position information acquisition unit 15.

FIG. 3 is a diagram showing an electrical configuration of the torque wrench 1. The data processing unit 20 includes a control unit 21, a storage unit 22, a display unit 23, and an operation unit 24. The control unit 21 includes an arithmetic unit such as a CPU (Central Processing Unit) and a storage device such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The ROM stores firmware that describes the procedure for starting the hardware and OS (Operating System). The RAM is used to store data when the CPU executes an operation. The storage unit 22 includes, for example, a semiconductor memory, and stores an OS, an application program, and the like. The display unit 23 is provided with, for example, a liquid crystal display device, and displays a specified value of torque, a measured value, and the like. The operation unit 24 includes, for example, a keypad, accepts operations such as setting and resetting a specified value, and outputs information according to the operation to the control unit 21.

The wireless communication unit 14 includes a communication I / F (Interface) for communicating with the tablet PC 3 according to, for example, a Bluetooth (registered trademark) protocol. The position information acquisition unit 15 receives, for example, a signal transmitted from a navigation satellite of GNSS (Global Navigation Satellite System) at a predetermined time interval (for example, 1 second interval), and based on the received signal, the torque wrench 1 The position information of the torque wrench 1 is acquired by calculating the position (an example of the acquisition means). The position information acquisition unit 15 transmits the acquired position information to the tablet PC 3 via the wireless communication unit 14 (an example of the position information transmission means). That is, in the present embodiment, the position information of the torque wrench 1 is transmitted to the tablet PC 3 at 1-second intervals. The torque measuring unit 16 includes a torque sensor that measures the torque when the fastener is tightened, and outputs the measured value to the control unit 21. A specified value of torque is stored in the storage unit 22. The default value can be changed. The control unit 21 compares the measured value with the specified value and detects that the measured value has reached the specified value (an example of the specified torque detecting means). When the control unit 21 detects that the measured value has reached the specified value, the control unit 21 transmits a detection signal to the tablet PC 3 via the wireless communication unit 14 (an example of transmission means).

FIG. 4 is a diagram showing an electrical configuration of the tablet PC 3. The control unit 31 includes an arithmetic unit such as a CPU and a storage device such as a ROM or RAM. The ROM stores firmware that describes the procedure for booting the hardware and OS. The RAM is used to store data when the CPU executes an operation. The storage unit 32 includes, for example, a semiconductor memory, and stores an OS, an application program, and the like.

The display unit 33 is provided with, for example, a liquid crystal display device, and displays a GUI (Graphic User Interface) screen for the user to operate the tablet PC. The operation unit 34 is provided with, for example, a touch panel or a keypad, receives an operation performed by the user, and outputs information according to the operation to the control unit 31. On the touch panel, operations such as tapping and flicking are possible. The wireless communication unit 35 includes a communication I / F for communicating with the wireless communication unit of a torque wrench according to, for example, a Bluetooth protocol. The external I / F unit 36 is, for example, a connector for mounting the USB memory 5.

FIG. 5 is a diagram showing a work DB (Data Base). The work DB is a database in which "identification information", "location information", "work result", and "completion date" are associated with each other. The "identification information" is information for identifying the fastener, and is represented by a multi-digit number in this example. "Position information" is information representing the position of the fastener, and in this example, it is represented by latitude and longitude. The "work result" represents the result of the tightening work of the tightening tool by the torque wrench 1, "NG" is set as an initial value, and when the detection signal is received from the torque wrench 1, it is rewritten to "OK". The "completion date and time" is the date and time when the tightening work is completed, for example, the date and time when the "work result" is rewritten to "OK".

<Operation>
The worker creates master data in advance. The master data is data in which the identification information of the fastener and the position information are associated with each other. The worker creates, for example, CSV format master data on the PC 6, and stores the created master data in the USB memory 5. The application of the management system is installed in the tablet PC 3 in advance. The worker turns on the tablet PC 3 and starts the application of the management system. Then, the control unit 31 of the tablet PC 3 causes the display unit 33 to display the menu screen.

FIG. 6 is a diagram showing a menu screen. On the menu screen, each button of "tightening work", "read master data", "output work result", and "display work result" is displayed. When the worker operates (for example, taps) the "read master data" button, the control unit 31 displays, for example, the message "Please install the USB memory" (not shown). When the worker attaches the USB memory 5 to the external I / F unit 36 of the tablet PC 3, the control unit 31 starts reading the master data from the USB memory 5 and writes the read master data to the work DB (FIG. 5). See "Identification Information" and "Location Information"). At this point, "NG" is set for all "work results", and "completion date and time" is blank. When the reading of the master data is completed, the control unit 31 displays, for example, the message "The reading of the master data is completed" and the "OK" button (not shown). When the "OK" button is operated, the display returns to the menu screen. The worker terminates the application and turns off the tablet PC3.

The worker brings the tablet PC 3 and the torque wrench 1 to the work place. Upon arriving at the work location, the worker turns on the tablet PC 3 and the torque wrench 1 to launch the management system application. Then, the control unit 31 of the tablet PC 3 displays the menu screen. The worker pairs the wireless communication unit 35 of the tablet PC 3 and the wireless communication unit 14 of the torque wrench 1 to connect the wireless communication by Bluetooth.

FIG. 7 is a flow chart showing the operation of the tablet PC 3. When the "tightening work" button on the menu screen is operated, the control unit 31 executes the following processing.
<Step S01>
When the worker operates the "tightening work" button, the control unit 31 displays the screen shown in FIG. 8 and determines whether or not to start the tightening work. On this screen, the message "Do you want to start the tightening work?", "Start" button and "Back" button are displayed. When the "back" button is operated, the control unit 31 cancels the process and returns to the display of the menu screen. When starting the tightening work, the worker moves to the position of the protective cap for performing the tightening work and operates the "start" button on the screen shown in FIG. When the "start" button is operated (step S101: YES), the process of the control unit 31 proceeds to step S02.

<Step S02>
The control unit 31 displays the screen shown in FIG. 9 and receives the position information (an example of the position information receiving means). On this screen, the message "Please perform the tightening work" and the "Cancel" button are displayed. When the "Cancel" button is operated, the control unit 31 cancels the process and returns to the display of the menu screen. When performing the tightening work, the worker fits the head 13 of the torque wrench 1 into the tightening tool and tightens the torque wrench 1. As described above, the position information of the torque wrench 1 is transmitted to the tablet PC 3 at 1-second intervals. When the position information is received, the process of the control unit 31 proceeds to step S03. As described above, when the torque reaches the specified value, the detection signal is transmitted from the torque wrench 1 to the tablet PC 3, but the timing of transmitting the position information and the timing of transmitting the detection signal are irrelevant. When the control unit 31 receives the detection signal (an example of the receiving means), the control unit 31 holds a flag indicating reception of the detection signal in the RAM. If a plurality of fasteners are provided for each protective cap, a detection signal is transmitted for each fastener, so that the same number of flags as the number of fasteners for each protective cap are displayed in the RAM. Be retained.

<Step S03>
The control unit 31 identifies a fastener whose distance from the torque wrench is within a predetermined range (an example of the identification means). Specifically, the control unit 31 calculates the distance between the position indicated by the received position information and the position indicated by the position information of each fastener recorded in the work DB, and the calculated distance is a determined range. The fasteners that are inside (for example, within 1 m) are extracted. The control unit 31 holds the extracted identification information of the tightening tool in the RAM.

<Step S04>
The control unit 31 receives the position information. This position information is the position information transmitted 10 seconds after the position information received in step S02. When the position information is received, the process of the control unit 31 proceeds to step S05.

<Step S05>
Similar to step S03, the control unit 31 identifies a fastener whose distance from the torque wrench is within a predetermined range.

<Step S06>
The control unit 31 determines from the identification information whether or not the tightening tool identified in step S03 and the tightening tool identified in step S05 are the same tightening tool. Specifically, if the torque wrench is located within 1 m from the same fastener for at least 10 seconds, it is determined that they are the same. If they are the same (step S06: YES), the process of the control unit 31 proceeds to step S07, and if they are not the same (step S06: NO), the process of the control unit 31 returns to step S04.

<Step S07>
The control unit 31 determines whether or not the detection signal has been received. Specifically, when the flag indicating the reception of the detection signal is held in the RAM, it is determined that the detection signal has been received (step S07: YES), and the process of the control unit 31 proceeds to step S08. If the flag is not held in the RAM, it is determined that the detection signal has not been received (step S07: NO), and the determination in step S07 is repeated. If a plurality of fasteners are provided for each protective cap, and if the RAM holds the same number of flags as the number of fasteners for each protective cap, the detection signal has already been received. If the number of flags is less than the number of fasteners, it is determined that the detection signal has not been received.

<Step S08>
The control unit 31 records the work result in the work DB (an example of the recording means). Specifically, the control unit 31 rewrites the "work result" corresponding to the identification information of the fastener identified in step S05 to "OK", and writes the date and time at this point in the "completion date and time". Then, the control unit 31 displays the screen shown in FIG. On this screen, the message "Protective cap x Tightening completed" (x is identification information) and the "Next" button are displayed. When the "Next" button is operated, the process of the control unit 31 returns to step S01. When starting the next tightening work of the protective cap, the worker moves to the position of the protective cap to be tightened and operates the "start" button on the screen shown in FIG. Subsequent processing is as described above. On the other hand, when the work is finished, the worker operates the "back" button to return to the menu screen. When a plurality of fasteners are provided for each protective cap, the work result for each fastener may be recorded in the work DB. Further, every time the detection signal is received, for example, the message "nth tightening completed" (n = 1, 2, ...) May be displayed.

FIG. 11 is a diagram showing a display example of a work result. This screen is displayed when the "work result display" button on the menu screen is operated. On the screen, icons indicating the identification information of the fasteners are displayed side by side, the icon corresponding to the identification information of "OK" in the work DB is blue, and the icon corresponding to the identification information of "NG" is displayed. It is displayed in different colors, such as yellow (an example of display means).

According to this embodiment, the fastener can be identified without performing the work for identifying the fastener to be tightened with the torque wrench. In addition, since it is configured to confirm that the distance between the torque wrench and the fastener is within the specified range for the specified period or longer, it is confirmed that the distance has continued for the specified period or longer. It is possible to increase the certainty of identification of the fastener as compared with the configuration without.

<Modification example>
The above embodiment may be modified as follows.
<Modification example 1>
In the above embodiment, an example is shown in which the position information of the torque wrench 1 is acquired to identify the fasteners whose distance from the torque wrench 1 is within a predetermined range. It may be identified. For example, an RFID tag that stores the identification information of the fastener is attached to the protective cap, and the fastener is identified by reading the identification information from the RFID tag with a tag reader attached to the head 13 of the torque wrench 1. You may. In this case, the strength of the radio wave of the tag reader is adjusted so that the communicable range between the RFID tag and the tag reader is, for example, 1 m. According to this configuration, a fastener having a distance from the torque wrench 1 within a predetermined range (within 1 m) is identified. In the case of a passive tag, since the communicable range is about several centimeters, it is not necessary to determine the distance between the torque wrench and the fastener.

<Modification 2>
FIG. 12 is a flow chart of a modified example. In this example, steps S11 to S13 are added between steps S07 and S08 in the flow chart of the embodiment (see FIG. 7).
The contents of steps S11, S12, and S13 are the same as those of steps S04, S05, and S06, respectively. Specifically, when it is determined that the detection signal has been received (step S07: YES), the position information is received again to identify the fastener (steps S11 and S12), and the fastener is used. If it is the same as the fastener identified in step S05 (step S13: YES), the work result is recorded in the work DB (step S08). That is, in this configuration, when the distance between the torque wrench and the fastener is within the determined range for a specified period or longer, and the detection signal is received by the receiving means within the specified period, The identification information indicating the fastener and the result indicated by the detection signal are associated and displayed (an example of display means). According to this configuration, it is possible to increase the certainty of identification of the fasteners as compared with the configuration in which it is determined that the detection signal has been received and the fasteners are not confirmed to be the same.

<Modification example 3>
Steps S04 to S06 of the flow chart of the embodiment (see FIG. 7) may be omitted. That is, in this configuration, the detection signal transmitted by the transmitting means is received (an example of the receiving means), and the fasteners having a distance from the torque wrench within a predetermined range are identified (an example of the identifying means). The identification information indicating the tightening tool identified by the identification means and the result indicated by the detection signal received by the receiving means are associated and displayed (an example of the display means).

<Modification example 4>
In the above embodiment, the tablet PC is illustrated as an example of the display device, but the display device may be a notebook PC, a smartphone, or the like.
The application program of the above management system may be recorded and provided on a computer-readable recording medium such as an optical recording medium or a semiconductor memory, and the program may be read from the recording medium and installed in the information collecting device. .. In addition, this program may be provided by a telecommunication line.

1 Torque wrench, 11 Grip, 12 Axis, 13 Head, 14 Wireless communication, 15 Position information acquisition, 16 Torque measurement, 20 Data processing, 21 Control, 22 Storage, 23 Display, 24 Operation 3, Tablet PC, 31 Control unit, 32 Storage unit, 33 Display unit, 34 Operation unit, 35 Wireless communication unit, 36 External I / F unit, 5 USB memory, 6 PC

Claims (1)

Since the worker is prevented from forgetting to fasten the fastening work of performing tightening by fastener to sequentially move the object of the moved position to the position of each of the plurality of objects which are spaced apart from each other It is a system to prevent forgetting to tighten
A torque wrench used by the worker to tighten the object and a display device are provided.
The torque wrench is
A specified torque detecting means for detecting that the torque when the fastener is tightened has reached a specified value, and
An acquisition means that receives a signal from a GNSS navigation satellite and acquires position information by calculating the position of its own device based on the signal.
When the acquisition means acquires the position information, the position information is transmitted to the display device, and when the specified torque detecting means detects that the torque has reached the specified value, a detection signal is transmitted to the display device. And have
The display device is
Receiving means for receiving a detection known signal and position information transmitted from the torque wrench after begin the tightening,
For each of a plurality of objects at different positions, a storage means for storing the position information of the fastener for tightening the objects, and a storage means.
A tightening tool whose distance to the torque wrench is within a predetermined range based on the position information of the torque wrench received by the receiving means and the position information of the tightening tool stored in the storage means. Identification means to identify
A first on the basis of the positional information said identification means fasteners which identifies that the received pre-Symbol receiving means, the identification on the basis of the second position information the receiving unit after a predetermined time has received the first position information means Ri same der and the fasteners were identified, and, when determining as many detection signal of the clamping device for clamping the object and received, fastening work of the object is complete A system to prevent forgetting to tighten, which has a display means to indicate what has been done.

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