JP2011230254A - Bolt axial force control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bolt axial force control system capable of controlling axial force of a bolt in fastening construction of the bolt.SOLUTION: This bolt axial force control system includes an axial force control bolt for arranging a strain sensor and an axial force detecting part inside the bolt, an axial force recording-transmission part for recording and transmitting the axial force detected by the axial force detecting part by radio transmission by being converted into data, a fastening control wrench having a connecting part for connecting the axial force detecting part and the axial force recording-transmission part, and a radio receiving module for receiving and displaying the data on the axial force transmitted by the radio transmission. The axial force detecting part and the axial force recording-transmission part are connected via the fastening control wrench, the axial force control bolt is fastened by the fastening control wrench, the strain sensor converts the axial force of the fastened axial force control bolt into an electric signal, the axial force detecting part detects and outputs the converted electric signal, the axial force recording-transmission part converts the output into data to be transmitted by the radio transmission, the radio receiving module receives and displays the transmitted data on the axial force, and a fastening state of the axial force control bolt is inspected.

Description

  The present invention relates to a bolt axial force management system, and more particularly to a bolt axial force management system that performs bolt axial force management at the time of bolt tightening.

  Generally, bolts are used for connection of transmission line spacers, steel structures and the like. Regarding the important tightening portion of the bolt, usually, first, temporary tightening is performed, marking is performed, and final tightening is performed under the presence of an inspection person. However, in the installation of the transmission line spacer of the transmission line, etc., it is impossible to inspect the tightening state of the bolt by a third party simply because of the work at a high place, and may be omitted. For this reason, the final tightening may not be performed due to an error by the person in charge of tightening, and the axial force may not be applied correctly.

  Patent Document 1 describes that a strain sensor is embedded in a bolt and the axial force of the bolt is measured when the bolt is tightened. However, in the invention of Patent Document 1, it is necessary to bring in equipment for measuring the axial force of the bolt, and it is impossible to easily tighten the bolt and measure the axial force at the site. It was also difficult for a third party to check the axial force at another location. Also, it was not possible to verify whether the bolts to be measured were specified for installation. Patent Document 2 describes that in order to identify a bolt, an RFID is attached to the bolt and its unique number is read in a non-contact manner. However, when reading with RFID, since there is no contact, there is a possibility that a unique number of a bolt in the vicinity other than the bolt being measured is read. It is necessary to eliminate such ambiguity in reading in order to reliably manage the tightening state of the bolt. In addition, due to the nature of radio waves, it may be difficult to transmit and receive radio waves when attached to a metal surface such as a bolt.

Japanese Utility Model Publication No. 6-347349 JP 2007-199867 A

  The present invention has been made to solve such problems, and an object of the present invention is to provide a bolt axial force management system capable of managing the axial force of a bolt at the time of bolt tightening.

  The bolt axial force management system of the present invention is a bolt axial force management system for managing the axial force of a bolt at the time of tightening the bolt. In the bolt axial force management system, an axial force management bolt in which a strain sensor and an axial force detection unit are arranged inside the bolt; Tightening management having axial force recording, transmitting and wirelessly transmitting the axial force detected by the axial force detection unit, and a connection unit for connecting the axial force detection unit to the axial force recording and transmission unit A wrench and a wireless reception module for receiving and displaying the wirelessly transmitted axial force data, the axial force detecting unit and the axial force recording and transmitting unit being connected via a tightening management wrench; and The axial force management bolt is tightened by the tightening management wrench, the axial force of the axial force management bolt to which the strain sensor is tightened is converted into an electric signal, and the converted electric signal is detected and output by the axial force detector. Axial force recording, transmission unit outputs the data And wirelessly transmits, receives and displays the data of the wireless receiving module axial force which is transmitted, characterized by checking the status tightening axial force control bolt.

  The axial force detection unit of the bolt axial force management system of the present invention further includes a unique number recording control unit, and manages a unique number of the axial force management bolt.

  The tightening management wrench of the bolt axial force management system according to the present invention comprises a tightening portion having a cavity having the same shape as the head covering the head of the axial force management bolt, and a ratchet mechanism for setting the tightening direction of the bolt. The wrench lever portion includes a connecting portion for connecting the axial force detecting portion and the axial force recording / transmitting portion to the upper portion of the cavity.

  ADVANTAGE OF THE INVENTION According to this invention, the bolt axial force management system which can perform the axial force management of the volt | bolt at the time of bolting construction can be provided.

The block diagram of the bolt axial force management system by this invention. The block diagram of the 1st axial force detection part by this invention, an axial force recording, and a transmission part. The block diagram of the clamping management wrench by this invention. The block diagram of the 2nd axial force detection part by this invention, an axial force recording, and a transmission part.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a bolt axial force management system according to the present invention. In FIG. 1, a bolt axial force management system 300 includes an axial force management bolt 1, an axial force detection unit 100, an axial force recording / transmission unit 200, a tightening management wrench 70, and a wireless reception module 50. The axial force management bolt 1 has an assembly hole 2 formed in a T shape. The axial force detection unit 100 includes a strain sensor 12 and an axial force detection board 21. The axial force recording / transmitting unit 200 includes an axial force recording / transmitting substrate 37. The wireless reception module 50 includes an antenna 51, a receiver 52, and a personal computer 53.

  A strain sensor 22 is enclosed and fixed to the wall surface of the T-shaped vertical hole of the axial force management bolt 1, and the axial force detection substrate 21 is embedded in the T-shaped horizontal hole, and the strain sensor lead wires are mutually connected. 11 is connected. The axial force detection board 21 and the axial force recording / transmission board 37 are inserted and connected via a connection portion 75 of a tightening management wrench 70 described in FIG.

  FIG. 2 is a configuration diagram of the first axial force detection unit, the axial force recording, and the transmission unit according to the present invention. 2, the axial force detection board 21 of the first axial force detector 100-1 includes a power input pin 24, a strain sensor output pin 25, a unique number output pin 26 of the axial force management bolt 1, and a ground pin. 29. Both ends of the resistance element 23-1 are connected between the power input pin 24 and the strain sensor output pin 25, and the microchip 28 performs recording control of the unique number between the power input pin 24 and the unique number output pin 26. Is connected, and between the strain sensor output pin 25 and the ground pin 29, the strain sensor lead wire 11 of the strain sensor 22 embedded alone in the axial force management bolt 1 described in FIG. 21 is configured.

  The first axial force record, the first axial force record of the transmission unit 200-1, the transmission board 37 includes an external output terminal 36, a power output pin 38, a strain sensor input pin 39, and an axial force management bolt 1. A unique number input pin 40 and a ground pin 41 are provided. Similarly, a power supply 30 is connected to the power output pin 38, an A / D converter 31 is connected between the strain sensor input pin 39 and the ground pin 41, and between the unique number input pin 40 and the external output terminal 36. Is connected to the CPU 35. Further, the A / D converter 31, the wireless module 42 including the antenna 43, the timer 32, the memory 33, and the speaker 34 controlled by the CPU 35 are connected to the CPU 35, and the first axial force recording and transmission board 37 is connected. It is configured.

  FIG. 3 is a configuration diagram of a tightening management wrench according to the present invention. FIG. 3a is a connection configuration diagram in which an axial force detection board and an axial force recording / transmission board are connected via a tightening management wrench. FIG. 3b is a plan view of the tightening management wrench. In FIG. 3, a tightening management wrench 70 sets a tightening portion 73 having a cavity having the same shape as the head covering the head of the axial force management bolt 1 formed inside, and a tightening direction of the bolt. And a wrench lever portion 71 having a ratchet mechanism. Further, the wrench lever portion 71 has a connection portion 75 for connecting the axial force detection substrate 21 and the axial force recording / transmission substrate 37 in the upper portion of the cavity formed in the tightening portion 73.

  Next, based on FIGS. 1-3, operation | movement of the bolt axial force management system 300 by this invention is demonstrated. The axial force management bolt 1 is usually flat on the upper surface, and is not different from other bolts only by seeing the substrate. At the time of bolt tightening, the head of the bolt is inserted into the cavity of the tightening portion 73 of the tightening management wrench 70, and each pin of the axial force detection board 21 is connected to the connection portion 75. Further, when each pin of the axial force recording / transmission board 37 is connected to the connecting portion 75, power is supplied to the axial force detection board 21 via the power output pin 38. The connection between each pin of the axial force detection board 21 and each pin of the axial force recording / transmission board 37 and the connecting portion 75 is not limited to this.

  When the axial force management bolt 1 is tightened by the tightening management wrench 70 in the tightening direction set in the ratchet, the strain sensor 22 is also pulled by the axial force by which the screw portion and the head of the bolt 1 are pulled up and down. extend. Since the resistance element value changes when the strain sensor is pulled, the axial force is converted into an electric signal and detected. If the elongation of the bolt 1 is substantially proportional to the change in the resistance element value and the relationship between the axial force applied to the bolt and the change in the resistance element value is grasped in advance, the axial force of the bolt can be measured electrically. In addition, metal expands and contracts depending on the temperature, but if the thermal expansion coefficient of the bolt and the resistance temperature coefficient of the strain sensor are selected to be reversed, they are offset each other, and the influence of temperature is compensated.

  First, the power is supplied to the strain sensor 22 via the resistance element 23-1. The strain sensor 22 expands and contracts according to the axial force, and a voltage corresponding to the resistance element of the strain sensor 22 is output to the strain sensor output pin 25. For example, when a voltage of 3 V is supplied to the power source, the resistance element 23 is 880 ohms, and the strain sensor 22 is 120 ohms, a voltage of 0.4 V is output according to Ohm's law. By applying an axial force to the bolt, the voltage of 0.4V changes.

  The unique number recording microchip 28 for recording and controlling the unique number on the axial force detection board 21 is, for example, a one-chip microcomputer. When the power is turned on, the unique number of the axial force management bolt 1 recorded in advance is recorded. The number is output as a serial signal at regular intervals. This signal is an asynchronous method which has been used for a long time, and is a signal of 9600 bps, 8 bits, for example. The unique number is, for example, 10 alphanumeric characters, the first 4 digits being the manufacturer ID and the last 6 digits being the serial number. This number can later be managed in a database with information such as the production lot number, production date, and delivery destination.

  When the axial force recording / transmission board 37 is attached to the bolt, the axial force recording / transmission board 37 first receives a unique number from the microchip 28. Next, the voltage from the strain sensor 22 is read by the A / D converter 31 and converted into a digital signal. At this time, the axial force is not applied yet, so wait for the axial force to be applied. When the bolt 1 is tightened by the tightening management wrench 70, an axial force is applied, and a sound proportional to the axial force is generated from the speaker 24. Tightening is terminated when the pronunciation corresponding to the specified axial force is reached.

  When the axial force recording / transmission board 37 is removed from the connection portion 75 of the tightening management wrench 70, the unique number output from the bolt 1 is stopped. The bolt tightening date and time, the bolt unique number, and the final value of the axial force are recorded in the memory 33 as unique data of the bolt 1 and transmitted from the wireless module 42 to the wireless receiving module 50 via the antenna 43.

  The receiver 52 of the wireless reception module 50 receives data transmitted through the antenna 51, and the personal computer 53 displays the data. This makes it possible to easily inspect the prescribed tightening condition of the prescribed bolt by a third party at a safe distance from the construction site. It is possible to prevent an accident from occurring when the tightening is not performed and the axial force is not applied correctly. Since the memory 33 is a flash memory and does not disappear even if the power is turned off, after the construction is completed, the construction manager moves the data in this memory from the external output terminal 36 to another medium by a download command, and completes the construction. Can be saved as a record.

  FIG. 4 is a block diagram of a second axial force detector, an axial force recording and transmitting unit according to the present invention. In FIG. 3, the axial force detection board 21 of the second axial force detector 100-2 includes a new strain sensor output pin 45, and the resistance element 23 is interposed between the power input pin 24 and the strain sensor output pin 45. -2 are connected to each other, and between the strain sensor output pin 45 and the ground pin 29, both ends of the resistance element 23-3 are respectively connected to the axial force of the first axial force detector 100-1. Different from the detection substrate 21.

  The second axial force record, the second axial force record of the transmission unit 200-2, and the transmission board 37 are provided with a new strain sensor input pin 46 and connected to the A / D converter 31. This is different from the first axial force recording of the transmission unit 200-1 and the transmission board 37. In this configuration, the strain sensor 22 and the resistance elements 23-1 to 23-3 constitute a bridge circuit connection, power is supplied to the power input pin 24 and the ground pin 29, and distortion occurs between the strain sensor output pins 25 and 45. The voltage output of the resistance element change of the sensor 22 is taken out and inputted to the A / D converter 31, whereby the axial force value can be detected, recorded, and transmitted with higher accuracy.

  As described above, according to the present invention, since it is possible to manage the axial force of the bolt at the time of tightening the bolt, the final tightening is not performed due to an error of a tightening person, and the axial force is correctly applied. Therefore, it is possible to provide a bolt axial force management system capable of preventing in advance an accident such as a dropout of a connecting part that occurs when the connection is not performed.

1 Axial force management bolt
2 Assembly hole 11 Strain sensor lead wire 12 Strain sensor 21 Axial force detection board
DESCRIPTION OF SYMBOLS 22 Strain sensor 23-1-3 Resistive element 24 Power supply input pin 25 Strain sensor output pin 26 Unique number output pin 28 Microchip 29 Ground pin 30 Power supply 31 A / D converter 32 Clock 33 Memory 34 Speaker 35 CPU
36 External Output Terminal 37 Axial Force Recording, Transmitting Board 38 Power Output Pin 39 Strain Sensor Input Pin 40 Sequential Number Input Pin Axial Force Recording, Each Pin on Transmitting Board 37 41 Ground Pin 42 Wireless Transmitting Module 43 Antenna 45 Strain Sensor Output Pin 46 Strain sensor input pin 50 Wireless reception module 51 Antenna 52 Receiver 53 Personal computer 70 Tightening management wrench 71 Wrench lever part 73 Tightening part 75 Connection part 100 Axial force detection part 100-1 First axial force detection part 100-2 First 2 Axial force detection unit 200 Axial force recording, transmitting unit 200-1 First axial force recording, transmitting unit 200-2 Second axial force recording, transmitting unit 300 Bolt axial force management system

Claims (3)

In the bolt axial force management system that manages the axial force of the bolt at the time of bolt tightening construction,
An axial force management bolt in which a strain sensor and an axial force detection unit are arranged inside the bolt, an axial force recording and transmitting unit that records and wirelessly transmits the axial force detected by the axial force detection unit, and the shaft A tightening management wrench having a connecting portion for connecting the force detection unit and the axial force recording and transmitting unit, and a wireless receiving module for receiving and displaying the wirelessly transmitted axial force data;
The axial force detection unit and the axial force recording / transmission unit are connected via the tightening management wrench, the axial force management bolt is tightened by the tightening management wrench, and the strain sensor is tightened. The axial force management bolt converts the axial force into an electrical signal, the axial force detection unit detects and outputs the converted electrical signal, and the axial force recording and transmission unit converts the output into data and wirelessly transmits it. And the wireless receiving module receives and displays the transmitted axial force data, and checks the tightening state of the axial force management bolt.   The bolt axial force management system according to claim 1, wherein the axial force detection unit further includes a unique number recording control unit, and manages a unique number of the axial force management bolt. The tightening management wrench includes a tightening portion having a cavity having the same shape as the head covering the head of the axial force management bolt, and a wrench lever portion having a ratchet mechanism for setting a tightening direction of the bolt. Have
2. The bolt axial force management system according to claim 1, wherein the wrench lever portion has a connection portion that connects the axial force detection portion and the axial force recording / transmission portion at an upper portion of the cavity.

Images