JPH08318438A - Nut runner of bolt and nut fastener - Google Patents

Abstract

PURPOSE: To make shaft center of a nut agree with shaft center of a bolt by supporting a nut socket on a rotary shaft through a long hole in such a way that it can travel freely and supporting the nut in a hold groove in such a way that it can travel freely. CONSTITUTION: If rickety motion occurs in a bolt hole, it is estimated that shaft center of a nut 2 is deviated from shaft center of a bolt 3 and that the nut 2 is not fitted in the bolt 3 smoothly. But, even if the shaft center of the nut 2 is deviated from the shaft center of the bolt 3, it moves freely along a long hole 12 in a scope of 2Xa in the X-axis direction by driving a rotary shaft 6 and rotating a nut socket 10 if the nut 2 is almost meshed with a tip of a male screw of the bolt 3. Moreover, a side of the nut 2 moves freely along an engaging face 13 on a groove side of a hold groove 10a in a scope of 2Xa in the Y-axis direction so that the shaft center of the bolt 3 agrees with the shaft center of the nut 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut runner of a bolt and nut fastening device provided in a segment assembly device for lining a tunnel excavated by a shield machine.

[0002]

2. Description of the Related Art Generally, in the shield construction method, segments are assembled for the inner wall of a tunnel by a segment assembling device, and the segments are fastened together by bolts and nuts.

The above segment assembly device includes
A bolt / nut fastening device for fastening the segments to each other with bolts / nuts is provided. As shown in FIGS. 4 and 5, this bolt / nut fastening device includes a nut 52 for a bolt 51 installed in a segment 50. It is equipped with a nut runner 53 for tightening.

This conventional nut runner 53 has a fastening motor 55 and a drive gear 57 attached to its output shaft 56.
And a passive gear 58 that is interlockingly connected to the drive gear 57 via a transmission gear, and a nut socket 60 attached to the passive gear 58 for holding the nut 52.

The nut socket 60 is integral with the rotation supporting shaft portion 61, and the rotation supporting shaft portion 61 has a passive gear 58.
And the nut socket 60 has a nut 5
A holding groove 62 for holding 2 is formed, and the holding groove 62 is formed in a shape substantially the same as the nut 52 in a relative shape.

Then, the nut 52 supplied from a supply device installed separately from the nut runner 53 is held in the holding groove 62, and the fastening motor 55 is driven to rotate the nut 52, which is then segmented. The ends of bolts 51 attached to 50 are fastened to join the segments together.

[0007]

In the nut runner 53 of the above-mentioned conventional bolt and nut fastening device, the nut socket 60 is integral with the rotation support shaft portion 61 thereof, and the holding groove 62 of the nut 52 is substantially the same as the nut 52. Since the diameter of each of the segments 50 is so small that the manufacturing accuracy of the segment 50 is poor or the bolt hole is loose, the shaft center of the nut 52 and the shaft center of the bolt 51 are deviated from each other, and the nut 52 is replaced by the bolt 51. The nut 52 cannot be rotated.

Therefore, when such a state occurs,
The nut runner 53 must be moved to align the bolts and nuts.
An adjustment mechanism to move the whole and adjust the position is required,
Therefore, there is a problem that the device becomes large-scale.

Therefore, an object of the present invention is to provide a nut runner for a bolt / nut fastening device which can solve the above problems. Then, this invention aims at provision of the shield machine which can solve the said subject.

[0010]

Means for solving the problems of the present invention include a rotating shaft which is supported by a nut runner main body and rotationally driven, and a bolt which is arranged on one side in the axial center direction of the rotating shaft. And a nut socket having a holding groove for holding a nut to be fastened to, and the nut socket is engaged with the rotating shaft in the rotating direction through an engaging portion and has a long hole elongated in a predetermined radial direction. Is movably supported in that direction, and the holding groove of the nut socket is
The nut has an engaging surface that engages in the rotational direction, and is formed to be long in a plane parallel to the plane including the elongated hole and in a direction perpendicular to the plane.

[0011]

In the above means for solving the problem, when the nut to be fastened to the bolt is held in the holding groove of the nut socket, the nut is aligned with the bolt, and the rotary shaft supported by the nut runner body is rotationally driven, the nut socket Engages in the rotation direction at the engaging portion and rotates and moves along a long hole that is long in a predetermined radial direction, the nut engages with the engagement surface of the holding groove and rotates, and the nut moves through the long hole. It moves along a holding groove formed in a plane parallel to the containing plane and in a direction perpendicular to the plane, and the axis of the bolt and the axis of the nut are aligned.

[0012]

Embodiments of the nut runner of the bolt / nut fastening apparatus according to the present invention will be described below with reference to FIGS.

The nut runner 1 of the bolt / nut fastening device according to the embodiment of the present invention uses a bolt chucker (not shown) when assembling the segments A installed in the tunnel by joining them with bolts / nuts. The bolt 2 is for fastening the nut 2 to the gripped bolt 3.

The nut runner 1 is provided with a box-shaped runner body 4, a drive motor (not shown) is attached to the base end of the runner body 4, and a drive gear is attached to the output shaft of the drive motor. Attached, runner body 4
A rotary shaft 6 rotatably supported by a runner body 4 via a bearing 5 is provided at the tip of the rotary shaft 6, and a passive gear 7 that rotates by receiving the driving force of the drive gear is provided on the rotary shaft 6.
And a plurality of transmission gears 8 for transmitting the driving force of the drive gear to the passive gear 7 are provided in the middle of the runner body 4.

The rotary shaft 6 has a support portion 9 projecting from the runner body 4 on one side in the axial direction thereof.
As shown in FIG. 2, the columnar one is formed by cutting both sides along the axial center to form a flat cross section.

A long hole 12 formed in the bottom of a nut socket 10 for holding the nut 2 is fitted into the support portion 9, and the long hole 12 has a flat shape corresponding to the sectional shape of the support portion 9 and has a long length. The width b1 of the hole 12 is formed to be slightly larger than the width b2 of the support portion 9 and in a predetermined radial direction (X-axis direction),
By being formed longer than the major axis of the support portion 9 by 2 × a, the nut socket 10 is configured to be movable by a distance of 2 × a in the X-axis direction.

When the rotary shaft 6 rotates, a pair of shaft side engaging surfaces 11 of the rotary shaft 6 and a pair of engaged surfaces 14 of the elongated hole 12 are formed.
The nut sockets 10 rotate around the axis of the support portion 9 by engaging with each other in the rotational direction.

As shown in FIG. 3, the nut socket 10 is formed with a holding groove 10a for mounting the hexagonal nut 2. The holding groove 10a is flat and its width b3 is larger than the width b4 of the nut 2. Slightly larger and longer than the diameter of the nut 2 by 2 × a in a predetermined radial direction (Y-axis direction that is a direction that is perpendicular to the plane including the elongated hole 12 and that is perpendicular to the X-axis direction). By being formed, the nut 2 becomes Y
It is configured to be movable in the axial direction by a distance of 2 × a.

When the rotary shaft 6 rotates, the holding groove 10
The pair of groove-side engagement surfaces 13 of a engages with the side surface of the nut 2, and the nut 2 rotates about the axis of the nut socket 10.
In addition, as shown in FIG. 1, in order to prevent the nut socket 10 from coming off from the support portion 9,
Pressing member 1 for pressing the outer peripheral edge of the nut socket 10
5 is attached.

In the above structure, the nut 2 is moved from the nut supply device (not shown) to the holding groove 10 of the nut socket 10.
After being supplied to a, the runner body 4 and the bolt chucker are respectively projected and moved to the segment A side, and are inserted into the bolt / nut mounting holes of the segment A, respectively.

Then, the head of the bolt 3 already inserted into the bolt hole is grasped by the bolt chucker, the runner body 4 is moved to bring the nut socket 10 close to the male screw end of the bolt 3, and the drive motor is driven at a low speed. The nut 2 is meshed with the tip of the male screw of the bolt 3 by rotationally driving.

By the way, if the manufacturing accuracy of the segment A is poor or the bolt hole is loose, the nut 2
It is expected that the nut 2 and the axis of the bolt 3 will not fit smoothly into the bolt 3 due to the deviation of the axis of the bolt 3 from the axis of the bolt 3, but even if the axis of the bolt 3 and the axis of the nut 2 deviate from each other. If the nut 2 is almost engaged with the male screw tip portion of the bolt 3, the rotary shaft 6 is driven to rotate the nut socket 10, which causes the long hole 12 in the range of 2 × a in the X-axis direction. Freely (along the engaged surface 14 along the shaft-side engaging surface 11), and the side surface of the nut 2 is in the range of 2 × a in the Y-axis direction. The shaft center of the bolt 3 and the shaft center of the nut 2 coincide with each other by freely moving along 13.

Then, by successively rotating the nut socket 10, the nut 2 can be fastened to the male screw tip of the bolt 3 and the segments A can be joined with each other by a bolt and a nut.

As described above, according to the embodiment of the present invention, the nut socket 10 is provided with the holding groove 10a for fitting the support portion 9 to form the elongated hole 12 elongated in the X-axis direction and for mounting the nut 2. Since the nut socket 10 is formed to be long in the Y-axis direction perpendicular to the X-axis direction, the nut socket 10 is movable in the X-axis direction along the long hole 12, and the nut 2 is movable in the Y-axis direction, the segment A is assembled. At this time, even if the axis of the bolt 3 and the axis of the nut 2 are deviated from each other, the axis of the bolt 3 and the axis of the nut 2 can be easily aligned with each other, so that the entire nut runner 1 can be moved. The nuts 2 can be fastened to the bolts 3 without joining them to join the segments A to each other.

In the above embodiment, in relation to the support portion 9 and the nut socket 10, the elongated hole 12 is formed on the nut socket 10 side so that the nut socket 10 can be fitted into the support portion 9.
The present invention is not limited to this, and even if a long hole is formed on the side of the supporting portion 9 and a protrusion that movably fits into this long hole is provided on the side of the nut socket 10, the same effect as the above embodiment can be obtained. Can play.

[0026]

As is apparent from the above description, the present invention rotatably supports a nut socket on a rotating shaft through a long hole that is long in a predetermined radial direction, and a holding groove of the nut socket has a long hole. Since the nut is movably supported in the holding groove in a plane parallel to the containing plane and in the direction perpendicular to it, even when the bolt axis and nut axis are misaligned when the segment is assembled. Since the nut socket moves freely along the long hole and the nut moves along the holding groove, there is no need to provide an adjustment mechanism to move the entire nut runner to adjust the position, as in the past. The axes of the nuts can be aligned with the core to join the segments together.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a nut runner showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line CC in FIG.

3 is a sectional view taken along line DD in FIG. 1.

FIG. 4 is a side view showing a usage state of a conventional nut runner.

FIG. 5 is a sectional view of the same main part.

[Explanation of symbols]

 1 Nut runner 2 Nut 3 Bolt 4 Runner body 6 Rotating shaft 9 Support part 10 Nut socket 10a Holding groove 11 Shaft side engaging surface 12 Long hole 14 Engaged surface 13 Groove side engaging surface A segment

Claims (1)

[Claims] 1. A bolt for rotating a nut to fasten it to a bolt when the segments to be installed in a tunnel are joined by bolts and nuts for assembly.
A nut runner for a nut fastening device, which has a rotating shaft that is supported by the nut runner main body and rotates, and a holding groove that is arranged on one side in the axial direction of this rotating shaft and that holds a nut that is fastened to a bolt. And a nut socket which is engaged with the rotating shaft in a rotating direction via an engaging portion and is movably supported in that direction via a long hole elongated in a predetermined radial direction, The holding groove of the nut socket has an engaging surface for engaging the nut in the rotational direction, and is formed long in a plane parallel to the plane including the elongated hole and in a direction perpendicular to the plane. Fastener nut runner.