JP2012115941A - Control system for potable fastening tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve yield by preventing oblique fastening of a screw component such as a bolt during a fastening step by a portable fastening tool.SOLUTION: A gyrosensor 10 (angle detection unit), which detects the tilt angle θ of the axial center L2 of the rotary shaft 2 of the impact trench 1 (portable fastening tool) with respect to the axial center L2 (reference line) of a screw hole 7, is attached to the impact trench 1. The impact trench 1 is drivable when the tilt angle θ is within a prescribed range. When the tilt angle θ exceeds the prescribed range, the impact trench 1 is not drivable.

Description

  The present invention relates to a control system for a portable fastening tool that fastens screw parts such as bolts and nuts.

  For example, in an automobile production line, an operator may tighten a nut or bolt using a portable tightening tool (such as an impact wrench) (for example, Patent Document 1).

JP 2009-50966 A

  For example, when attaching the component W to the engine E of an automobile, the bolts are tightened with an impact wrench as follows. First, as shown in FIG. 2, the bolt 4 is attracted by the magnet 5 to the inner periphery of the socket 3 attached to the rotating shaft 2 of the impact wrench 1. Next, as shown in FIG. 3, the tip of the bolt 4 attached to the socket 3 is pressed against the opening of the screw hole 7 of the engine E, and in this state, the trigger 8 of the impact wrench 1 is pulled, and the bolt 4 is screwed into the screw hole. Tighten to 7.

  In the tightening process as described above, when the tip end of the bolt 4 is pressed against the opening of the screw hole 7 of the engine E, the impact wrench 1 is inclined as shown in FIG. May be inclined with respect to the axis L2 of the screw hole 7. If the bolt 4 is tightened into the screw hole 7 in this state, the bolt 4 is tightened in a state where the bolt 4 is inclined with respect to the screw hole 7. Since the product (engine E) with the bolts tightened obliquely is discarded as a fastening failure product, the yield is reduced.

  Therefore, it is necessary to perform the bolt tightening operation in a state where the bolt and the screw hole are coaxially arranged. At present, the posture of the impact wrench is adjusted with the operator's sense. For example, when the screw hole is formed in a plane extending in the vertical direction, the bolt and the impact wrench may be arranged in the horizontal direction, so that it is easy to sensibly align the axial centers of the bolt and the screw hole. However, when the screw hole is formed on an inclined plane or curved surface, it is necessary to arrange the bolt and the impact wrench in a direction orthogonal to the inclined plane or curved surface. It is very difficult to perform such work accurately only by the operator's sense.

  The problem to be solved by the present invention is to prevent a screw component such as a bolt from being obliquely tightened with respect to a screw hole in a tightening process using a portable tightening tool, thereby increasing the yield.

  The present invention made to solve the above-described problems includes a portable clamping tool, an angle detector that is attached to the portable clamping tool and detects an inclination angle of the portable clamping tool with respect to a reference line, and an angle detection A drive control unit that enables the portable clamping tool to be driven when the inclination angle of the portable clamping tool detected by the unit is within a predetermined range, and cannot be driven when the inclination angle exceeds the predetermined range. This is a control system for a portable clamping tool.

  As described above, in the control system for the portable fastening tool (hereinafter simply referred to as a fastening tool) according to the present invention, the inclination angle of the fastening tool with respect to the reference line (for example, the axis of the screw hole) is within a predetermined range. Only in certain cases, the tightening tool can be driven. As a result, the tilt angle of the tightening tool exceeds a predetermined range, that is, the axis of the screw component (for example, a bolt) attached to the tightening tool and the axis of the attachment portion (for example, the screw hole) provided on the workpiece. Since the fastening tool is not driven in a state where the angle with the center exceeds the allowable range, it is possible to reliably prevent the screw component from being obliquely tightened with respect to the attachment portion of the workpiece.

  In the above-described tightening tool control system, when the tilt angle of the tightening tool exceeds a predetermined range and cannot be driven, the operator needs to correct the angle of the tightening tool. However, if it is not known how much the fastening tool is displaced in which direction, the angle of the fastening tool must be corrected by the operator's sense, and there is a possibility that it takes time for the correction. Therefore, if the above-mentioned control system is provided with a display unit that displays the tilt angle and tilt direction of the portable clamping tool with respect to the reference line, the operator can tighten while watching the tilt angle and tilt direction displayed on the display unit. Since the posture of the attached tool can be corrected, it is possible to work efficiently.

  For example, when the tightening tool is moved, if the tilt angle of the tightening tool falls within a predetermined range, the tightening tool may be erroneously driven. Therefore, the angular velocity of the tightening tool is further detected by the angle detection unit, and the drive control unit can drive the tightening tool only when the angular velocity is within the predetermined range. If the angular velocity exceeds the predetermined range, the tightening tool is tightened. If the tool cannot be driven, the fear that the tightening tool is driven during the movement can be surely avoided.

  As described above, according to the tightening tool drive management system of the present invention, it is possible to prevent screw parts such as bolts from being obliquely tightened by the tightening tool, thereby suppressing the occurrence of defective products. Yield can be increased.

It is a top view of a production line including a control system of a fastening tool concerning one embodiment of the present invention. It is sectional drawing which shows a mode that a volt | bolt is fastened to a screw hole with an impact wrench. It is sectional drawing which shows a mode that a volt | bolt is fastened to a screw hole with an impact wrench. It is sectional drawing which shows a mode that the axial center of the rotating shaft of an impact wrench inclined with respect to the axial center of a screw hole.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A fastening tool control system 100 according to an embodiment of the present invention uses, for example, a predetermined part W (exhaust manifold, etc.) with bolts to an automobile engine E conveyed on a conveyor C as shown in FIG. Applicable to the production line to be installed. The control system 100 includes an impact wrench 1 as a fastening tool, a gyro sensor 10 as an angle detection unit fixed to the impact wrench 1, a gyro sensor controller 20 connected to the gyro sensor 10, and a gyro sensor controller 20. A drive control unit 30 connected to control the drive of the impact wrench 1 and a display unit 40 connected to the gyro sensor controller 20 are provided. In addition, since the impact wrench 1 is the same as that shown in FIGS.

  The gyro sensor 10 detects an inclination angle with respect to the reference line of the impact wrench 1. In the present embodiment, as shown in FIG. 4, the gyro sensor uses the axis L2 of the screw hole 7 provided in the engine E as a reference line, and the axis L1 of the rotary shaft 2 of the impact wrench 1 with respect to this reference line. The inclination angle θ (see FIG. 4) and the inclination direction are detected. The gyro sensor 10 further detects the angular velocity of the impact wrench 1. The signals of the tilt angle θ, the tilt direction, and the angular velocity of the impact wrench 1 detected by the gyro sensor 10 are transmitted to the gyro sensor controller 20.

  The gyro sensor controller 20 determines whether or not the tilt angle θ of the impact wrench 10 is within a predetermined range (for example, within 5 °), and issues a command to the drive control unit 30 based on the determination result. Specifically, if the inclination angle θ is within a predetermined range, the drive controller 30 is instructed to supply power to the impact wrench 1 so that the impact wrench 1 can be driven. On the other hand, when the inclination angle θ exceeds the predetermined range, the drive control unit 30 is instructed to cut off the power supply to the impact wrench 1, and the drive is not activated even if the trigger 8 of the impact wrench 1 is pulled. Make it possible. Thereby, the situation where the bolt 4 is tightened obliquely with respect to the screw hole 7 can be avoided.

  Further, the gyro sensor controller 20 determines whether or not the angular velocity of the impact wrench 1 is a predetermined value or less, and issues a command to the drive control unit 30 based on the determination result. Specifically, if the angular velocity of the impact wrench 1 is equal to or less than a predetermined value, the drive controller 30 is instructed to supply power to the impact wrench 1 so that the impact wrench 1 can be driven. On the other hand, when the angular velocity of the impact wrench 1 exceeds a predetermined value, the drive controller 30 is instructed to cut off the supply of power to the impact wrench 1 so that the impact wrench 1 cannot be driven. To do. Thereby, even when the trigger 8 is accidentally pulled during the movement of the impact wrench 1, the impact wrench 1 can be prevented from being driven.

  The display unit 40 is connected to the gyro sensor controller 20 and displays information related to the posture of the impact wrench 1. Specifically, the tilt angle θ and the tilt direction of the impact wrench 1 are displayed. When the tilt angle θ exceeds the predetermined range and the impact wrench 1 becomes incapable of being driven, the operator corrects the posture of the impact wrench 1 while viewing the tilt angle θ and the tilt direction displayed on the display unit 40. Therefore, it is possible to work efficiently. In the illustrated example, the display unit 40 is provided independently from the gyro sensor controller 20, so that the display unit 40 can be freely arranged at a position that is easy for the operator to see.

1 Impact wrench (portable clamping tool)
2 Rotating shaft 3 Socket 4 Bolt 5 Magnet 7 Screw hole 8 Trigger 10 Gyro sensor (Angle detection unit)
20 Gyro sensor controller 30 Drive control unit 40 Display unit 100 Control system E Engine W Parts attached to the engine

Claims (3)

  A portable clamping tool, an angle detector that is attached to the portable clamping tool and detects the tilt angle of the portable clamping tool with respect to a reference line, and the tilt angle of the portable clamping tool detected by the angle detector However, a portable clamping tool control system comprising: a drive control unit that enables driving of the portable clamping tool when it is within a predetermined range, and disables driving when exceeding the predetermined range.   The control system for a portable clamping tool according to claim 1, further comprising a display unit that displays an inclination angle and an inclination direction of the portable clamping tool with respect to a reference line.   The angle detection unit further detects the angular velocity of the portable clamping tool, and the drive control unit can drive the portable clamping tool when the angular velocity detected by the angle detection unit is within a predetermined range. The portable clamping tool control system according to claim 1 or 2, wherein the portable clamping tool cannot be driven when the angular velocity detected by the unit exceeds a predetermined range.

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