JP2011240425A - System for preventing fastening member from being left unfastened - Google Patents

Abstract

To provide a fastening member tightening forgetting prevention system capable of preventing forgetting to fasten a fastening member such as a bolt.
A torque limiter sensor that detects that the tightening torque of a bolt B has reached a set torque value, and a torque sensor that detects the tightening torque value, the tightening torque value being a low torque value. Is displayed, the torque wrench 30 with a marker for marking the mark B on the bolt B, the camera 1 for photographing a predetermined number of bolts B in the specific area A tightened by the torque wrench 30, and the photographing information of the camera 1 are displayed. And a determination device 2 having a torque value display unit 4 for displaying a torque value when the torque limiter sensor of the bolt B is turned on as a tightening torque value based on sensor information from the torque wrench 30. It is characterized by comprising.
[Selection] Figure 1

Description

  In order to prevent forgetting to fasten fastening members such as bolts and nuts, the present invention includes tightening in addition to bolt tightening using, for example, a torque wrench with a marker for marking the bolt head indicating fastening. A fastening member that can be used to record a recorded bolt head with a digital camera, display the photographed image and the tightening torque of the bolt, and confirm that a predetermined bolt has been securely tightened and visually recorded It relates to a tightening prevention system.

  A torque wrench with a marker has been proposed as a torque wrench that makes it possible to check whether a fastening member such as a bolt or a nut has been forgotten to be tightened (Patent Document 1).

  This marker-equipped torque wrench is used to mark the head of a bolt that has been tightened with a set torque value with a marker, and if it is marked, it can be confirmed visually that tightening with the set torque value has been completed. It becomes possible.

  In addition, the area where the tightening work is performed with a torque wrench with a marker is photographed with a digital camera, image processing is performed to determine the marking portion based on the image data, and the number of marking portions is counted, thereby taking this photographing. A fastening member tightening forgotten prevention system that automatically checks forgetting to tighten a fastening member by comparison with the number of bolts in the region has been proposed (Patent Document 2).

JP-A-06-297352 JP 2004-249388 A

  In the fastening member tightening forgotten prevention system shown in Patent Document 2, image processing of the marking portion is performed to automatically check for forgetting tightening of the fastening member. However, the marking has already been performed at a predetermined position, for example, by the previous tightening. Even if the bolts that have been installed are only installed in the bolt holes and no bolting is performed, there is a risk that the bolts are determined to be tightened with the set torque value in the appearance inspection.

  In view of such a point of view, the present invention provides an imaging screen in which a predetermined number of fastening members such as bolts within a predetermined region are tightened with a torque wrench with a marker and tightening is performed with a set torque value. It is an object of the present invention to provide a fastening member tightening forgotten prevention system capable of checking and confirming the actual tightening torque value of each fastening member and preventing forgetting to fasten a fastening member such as a bolt.

  A fastening member tightening forgetting prevention system that realizes an object of the present invention is a fastening member tightening forgetting prevention system in which one or a plurality of predetermined number of fastening members existing in a specific region are to be inspected. A torque limiter sensor that detects that the torque has reached the set torque value and a torque sensor that detects the tightening torque value. When the tightening torque value reaches the low torque value, the fastening member is marked. A torque wrench with a marker for marking, a camera for photographing a predetermined number of fastening members in the specific region tightened by the torque wrench, an image display unit for displaying photographing information of the camera, and a torque wrench Based on sensor information, the torque value when the torque limiter sensor of the fastening member is turned on is displayed as a tightening torque value. Characterized in that and a determination device having a value display portion.

  According to the present invention, it is possible to confirm forgetting to tighten by double checking by using both the image display by the image display unit and the tightening torque value of the torque value display unit. Therefore, if there is an inappropriate state in which a fastening member such as a bolt with a mark is simply inserted into the bolt hole, this cannot be detected by checking the image display unit, but the torque value of the torque value display unit is checked. In this way, this inappropriate state can be detected. For this reason, it is possible to reliably prevent forgetting to tighten a fastening member such as a bolt, including forgetting to tighten without attaching the bolt itself.

The figure which shows embodiment of the fastening member fastening forgetting prevention system by this invention. The enlarged view of the display part of the determination apparatus shown in FIG. It is detail drawing of the torque wrench with a marker shown in FIG. 1, (a) is a top view, (b) is a front view, (c) is AA arrow sectional drawing of (a).

  The fastening member forgetting prevention system according to the present invention will be described based on the embodiment shown in FIGS.

  In FIG. 1, a plurality of bolts B (15 in FIG. 1) are tightened in an inspection target area A, which is an inspection target area for inspecting forgetting to tighten a bolt. In the present embodiment, these bolts B are tightened by the torque wrench 30 with a marker shown in FIG. 3, and the mark M is marked on the head of the bolt B to indicate that it is tightened with a set torque value. The marker-equipped torque wrench 30 includes a torque limiter sensor 71 that detects that the tightening torque of the bolt B has reached a set torque value, and a torque sensor 73 such as a strain gauge that detects the tightening torque value. The sensor information of the sensor 71 and the torque sensor 73 is output to the wireless transmitter 74. As sensor information transmitted by the wireless transmitter 74, when the torque limiter sensor 71 is turned on, the torque value of the torque sensor 73 is transmitted as a tightening torque value, or the torque value of the torque sensor 73 is continuously determined by the determination device 2. The torque value when the torque limiter sensor 71 is turned on by the determination device 2 may be used as the tightening torque value. The wireless transmitter 74 transmits the sensor information to the wireless receiver 6 connected to the determination device 2 such as a personal computer, and stores the sensor information in a memory (not shown) of the determination device 2.

  In the present embodiment, when the fastening of a predetermined number of bolts B in the inspection target area A is completed, the inspector photographs the inspection target area A with the digital camera 1. The image recorded in the digital camera 1 is transmitted to the memory of the discrimination device 2 from the non-contact data transmitter 5 by placing the digital camera 1 on the non-contact data transmitter 5, for example, and Images are stored in the memory.

  The determination device 2 includes an operation unit 3 such as a keyboard and a display unit 4 such as a monitor screen. As shown in FIG. 2, the display unit 4 includes an image display unit 4A and a torque value display unit 4B of a fastening member. ing.

  The image display unit 4A displays an image of the inspection target area A stored in the memory, and the torque value display unit 4B displays the torque values of the tightened bolts according to the tightening order (1 to 3 in this embodiment). No. 15).

  The inspector confirms whether or not the mark M is marked on all the bolts B displayed on the image display unit 4A, and confirms that the mark M is marked on all the bolts B. Check the tightening torque value of bolt B.

  In the inspection target area A, when the set torque values of all the bolts B are equal, it is possible to determine whether or not the bolts B are properly tightened by directly reading the tightening torque values.

  That is, according to the present embodiment, it is possible to confirm forgetting to tighten by double checking by using both the image display by the image display unit 4A and the tightening torque value of the torque value display unit 4B. Therefore, when there is an inappropriate state in which the bolt B with the mark M is simply inserted into the bolt hole, this cannot be detected by checking the image display unit 4A, but the torque value of the torque value display unit 4B is checked. In this way, this inappropriate state can be detected.

  In the configuration of the above-described embodiment, it is assumed that the inspector knows the tightening torque value in advance. However, the set torque value can be input in advance by operating the operation unit 3. In this case, if the tightening torque of the bolt B is within the proper range with respect to the set torque value, the bolt is displayed, for example, if the tightening torque value of the second bolt is out of the proper range, it is properly displayed in red. It may be warned that the bolt has not been tightened, and in particular if the value is much smaller than the appropriate range or zero, a flashing display may warn that the bolt is not tightened at all.

  Further, the tightening order and the set torque value are described even when the tightening order is determined in advance for the plurality of bolts B in the inspection target region A and the set torque values are different. The inspector can check the set torque value while looking at the table. Further, the tightening order and the set torque value may be input by the operation unit 3.

  Next, the configuration of the marker-equipped torque wrench 30 will be described with reference to FIG. The torque wrench body 31 is attached to a tube 33 having a toggle mechanism 32 as a torque limiter, a head 35 supported by a support shaft 34 attached to the tip of the tube 33, and a tail end of the tube 33. A handle 36 is provided.

  The torque wrench body 31 is provided with a marker driving mechanism 37 for interlocking the marker by the operation of the toggle mechanism 32. The marker driving mechanism 37 has an L-shaped link 39 that is pivotally supported by a spindle pin 38 that is fixed to the outside of the tube 33, and one end of the link 39 has an adjustment screw 40 that is screwed thereto. The other end of the link 39 is in contact with the lever 41 via a sphere 42.

  In the present embodiment, the torque limiter sensor 71 such as an MR element detects that the toggle mechanism 32 has reached the set torque value, that is, that the torque limiter operates. The MR element 71 as a torque limiter sensor is disposed in the vicinity of the permanent magnet 72 provided on the link 39, and outputs a torque limiter operation signal when the permanent magnet 72 approaches the MR element 71 by the rotation of the link 39. A torque sensor 73 such as a strain gauge is attached to the head 35 and outputs a tightening torque value.

  One end of the lever 41 is pivotally supported by the tube 33, and the other end is engaged with the marker head 44 of the marker mechanism 43. Reference numeral 45 denotes a cover of the marker driving mechanism 37.

  The structure of the marker mechanism 43 will be described below. Reference numeral 46 denotes a ratchet cylinder having a ratchet 47 provided in the head 35. The upper end of the cylindrical adapter 49 is coupled to a hexagonal shaft portion 48 formed at the lower end of the ratchet cylinder 46 by a coupling screw 50. Is retained. The socket 51 is fitted to the lower end portion of the cylindrical adapter 49 so as to be slidable in the axial direction. The sliding range includes a long hole 52 long in the direction of the generatrix of the cylindrical adapter 49 and the long hole. It is regulated by a guide pin 53 that is loosely fitted in 52 and is implanted in the socket 51.

  The marker head 44 holds the upper end of a marker rod 54 inserted into the ratchet tube 46 and the cylindrical adapter 49, and the lower end of the marker rod 54 holds a marker 55 in which, for example, sponge is impregnated with colored ink. A marker case 56 is held via a connecting pin 57 and an O-ring 58.

  In addition, 59 is a spring that allows the marker rod 54 to move up and down, 60 is a restoring spring for the lever 41, 61 is interposed between the upper end of the socket 51 and a retaining ring 62 provided on the cylindrical adapter 49, so that the socket 51 is a spring that always pushes down 51. 63 is a nut and 64 is its bolt.

  The socket 51 of the marker 43 before the nut 63 is tightened is pushed by the elastic force of the spring 61, and the guide pin 53 is engaged and stopped at the lower end of the long hole 52.

  When the nut 63 is screwed by the torque wrench body 31 provided with the marker mechanism 43 in this state, the socket 51 is fitted to the nut 63, and then the handle 36 of the torque wrench body 31 is reciprocated. The socket 51 rotates through the ratchet cylinder 46 and the cylindrical adapter 49, and the nut 63 is tightened. When the tightening torque reaches a predetermined value, the toggle mechanism 32 in the torque wrench body 1 operates.

  When the toggle mechanism 32 operates, the head 35 operates counterclockwise with the support shaft 34 as a fulcrum, so that the link 39 rotates clockwise with the support pin 38 as a fulcrum. By the operation of the link 39, the lever 41 whose one end is supported by the lever fulcrum 65 is pushed down as shown by a chain line in FIG. The marker head 44 is pushed down. When the marker head 44 is pushed down, the marker rod 54 is pushed down against the elastic force of the spring 60, and the marker 55 attached to the lower end of the marker rod 54 is pushed against the tip of the bolt 64 and screwed. A marking is made to signify that the fastening has been completed.

  In addition, the torque wrench with a marker of the present invention is not limited to the configuration shown in FIG. 3 described above, and may be a torque wrench with a marker having another configuration.

  Further, the photographing data of the digital camera may be directly stored in the determination device 2.

  Furthermore, in this embodiment, although the several volt | bolt B in the forgetting | tightening inspection object area | region A is made into a test object, one bolt (fastening member) may be sufficient.

DESCRIPTION OF SYMBOLS 1 Digital camera 2 Judging device 3 Operation part 4 Display part 5 Non-contact data transmitter 6 Receiver 30 Torque wrench 71 with a marker Transmitter A Forget tightening inspection area B Bolt M Mark

Claims (1)

A fastening member tightening forgetting prevention system in which one or a plurality of predetermined number of fastening members existing in a specific region are to be inspected,
It has a torque limiter sensor that detects that the tightening torque of the fastening member has reached the set torque value, and has a torque sensor that detects the tightening torque value, and when the tightening torque value reaches the low torque value, A torque wrench with a marker to mark the fastening member;
A camera for photographing a predetermined number of fastening members in the specific region tightened by the torque wrench;
Torque value display for displaying a torque value when the torque limiter sensor of the fastening member is turned on as a tightening torque value based on an image display unit for displaying photographing information of the camera and sensor information from the torque wrench A determination device having a section;
A fastening member forgetting prevention system for tightening a fastening member.

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