JPH08323560A - Nut runner for bolt / nut fastening device - Google Patents

Abstract

(57) [Summary] [Structure] When the shaft center of the nut 2 and the shaft center of the bolt 3 are deviated from each other, a gap between the periphery of the protrusion 12 and the recess 13 and a periphery of the nut socket 10 and the pressing member 14 are formed. Since the first floating gap 15 and the second floating gap 16 are provided between them, by rotating the nut socket 10,
By the nut socket 10 freely moving along the first floating gap 15 and the second floating gap 16, the axis of the bolt 3 and the axis of the nut 2 are aligned, and the nut socket 10 is continuously rotated. , The nut 2 is fastened to the tip of the male screw of the bolt 3, and the segments A are joined together by the bolt and the nut. [Effect] By providing a floating gap between the periphery of the protrusion and the recess, the nut socket can move freely along the floating gap even when the axis of the bolt and the axis of the nut are misaligned. Thus, the axis of the bolt and the axis of the nut can be easily matched.

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.

[0010]

Means for solving the problems of the present invention is to provide a rotating shaft that is driven to rotate and a rotating shaft that is separately provided and supported on one side in the axial direction via a connecting mechanism. And a nut socket for holding the nut, and the connecting mechanism is provided on one of the rotary shaft and the nut socket, and on the other of the rotary shaft and the nut socket, and the fitting mechanism is fitted to the projecting portion. A mating recess is provided, and a floating gap is provided between the periphery of the projection and the recess to allow the nut socket to radially move.

Further, there is provided a spring member for urging the nut socket holding the nut in a direction in which its axis coincides with the axis of the rotary shaft.

[0012]

In the above means for solving the problem, when the shaft center of the bolt and the shaft center of the nut deviate from each other, when the rotary shaft is driven to rotate, the protrusion and the recess fitted to the protrusion are formed on one side in the axial center of the rotary shaft. The nut socket supported via the connecting mechanism including the shaft rotates and also moves in the radial direction along the floating gap provided between the periphery of the protrusion and the recess, and the shaft center of the bolt and the shaft of the nut. It matches my heart.

Further, the nut socket is biased by a spring member in a direction in which its axis coincides with the axis of the rotary shaft.

[0014]

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 is constructed such that when the segments A to be installed in the tunnel are joined by bolts / nuts and assembled, the bolts 3 gripped by the bolt chucker are used. , For fastening the nut 2.

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 hollow rotary shaft 6 rotatably supported by a runner body 4 via a bearing 5 is provided at the tip end of the passive gear 7 that rotates by receiving the driving force of the drive gear. 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.

A nut for holding the nut 2 separately from the rotary shaft 6 is provided on one side in the axial direction of the rotary shaft 6 by expanding one side of the rotary shaft 6 and projecting from the runner body 4. Socket 10 is arranged, and this nut socket 10 is
Holding groove 10a for mounting the nut 2 and opening 10b at the bottom
And is supported by the rotary shaft 6 via a connecting mechanism 11.

The connecting mechanism 11 is formed on one side of the rotary shaft 6 and has a projection 12 that is rectangular in a front view and projects toward the nut socket 10 side. The connection mechanism 11 is formed on the nut socket 10 and is externally fitted to the projection 12. Consists of a recess 13 and a pressing member 14 that is attached to the runner body 4 via the mounting bolt 9 and presses the outer peripheral edge portion of the nut socket 10 to prevent the nut socket 10 from coming off the protrusion 12. There is.

Also, between the periphery of the protrusion 12 and the recess 13, and between the periphery of the nut socket 10 and the pressing member 14.
A first floating gap 15 and a second floating gap 16 are provided between and to allow the nut socket 10 to move in the radial direction.

Then, it is passed over the stepped surface of the inner peripheral recessed portion 12a of the projection 12 and the opening 10b of the nut socket 10,
An annular leaf spring member 18 is provided, and the leaf spring member 18
As a result, the nut socket 10 has its axis centered on the rotary shaft 6.
Is urged in a direction (radial direction) coinciding with the axis center of.

In the above structure, the nut 2 is inserted into the holding groove 10 of the nut socket 10 from a nut supply device (not shown).
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, and the nut socket 10 is brought close to the male screw end of the bolt 3. Here, the nut socket 10 is
Since the axial center is biased by the leaf spring member 18 in a direction coinciding with the axial center of the rotary shaft 6, the axial center of the nut 2 and the axial center of the bolt 3 coincide.

Further, by rotating the drive motor at a low speed, the nut socket 10 is rotated through the connecting mechanism 11 to engage the nut 2 with the tip of the male screw of the bolt 3.

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 are displaced from each other and the nut 2 is not smoothly fitted to the bolt 3, but the surroundings of the protrusion 12 of the rotary shaft 6 and the recess 13 of the nut socket 10 are And between the nut socket 10 and the pressing member 14
Between the first floating gap 15 and the second floating gap 16
Since the nut socket 10 is provided, the nut socket 10 is rotated even if the axial center of the bolt 3 and the axial center of the nut 2 deviate from each other as long as the nut 2 is almost engaged with the male screw tip of the bolt 3. As a result, this freely moves along the first floating gap 15 and the second floating gap 16, the axial center of the bolt 3 and the axial center of the nut 2 match, and the nut socket 10 is subsequently rotated. The nut 2 can be fastened to the male screw tip of the bolt 3 to join the segments A to each other with a bolt and a nut.

As described above, according to the embodiment of the present invention, the periphery of the projection 12 of the rotary shaft 6 and the recess 1 of the nut socket 10 are provided.
By providing the first floating gap 15 and the second floating gap 16 between the nut socket 10 and the periphery of the nut socket 10 and the pressing member 14, the axial center of the bolt 3 and the axial center of the nut 2 are deviated. Even if it is, the nut socket 10 freely moves along the first loose gap 15 and the second loose gap 16 to easily align the axial center of the bolt 3 and the axial center of the nut 2 with each other, and the nut runner 1 The nuts 2 can be fastened to the bolts 3 and the segments A can be joined together without moving the whole.

In the above-described embodiment, in the coupling mechanism 11, the projection 12 is formed on one side of the rotary shaft 6, and the recess 13 that is fitted on the projection 12 is formed in the nut socket 10. The first floating gap 15 is provided between the concave portion 13 and the concave portion 13. However, the present invention is not limited to this. The convex portion 12 is provided on the nut socket 10 side, and the concave portion 13 fitted on the convex portion 12 is provided on the rotary shaft 6 side. Provided on the periphery of the protrusion 12 and the recess 1
Even if the first floating gap 15 is provided between the same and the third embodiment, the same operational effect as the above-mentioned embodiment can be obtained.

[0027]

As is apparent from the above description, according to the present invention, a nut socket for holding a nut and a coupling mechanism having a projection and a recess are provided separately from a rotating shaft that is rotationally driven. Via the between the periphery of the protrusion and the recess,
Since there is a play gap that allows the nut socket to move in the radial direction, even if the shaft center of the bolt attached to the segment deviates from the shaft center of the nut, the nut socket can move freely along the play gap. Since it moves, it is possible to easily match the shaft center of the bolt and the shaft center of the nut and join the segments without the need for an adjustment mechanism that moves the entire nut runner to adjust the position. it can.

[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 front view of the same.

FIG. 3 is a view taken along the line XX in FIG.

FIG. 4 is a sectional view of a main part of a nut runner showing a conventional example.

FIG. 5 is also an overall view showing a usage state.

[Explanation of symbols]

 2 nuts 3 bolts 4 runner body 6 rotating shaft 10 nut socket 10a holding groove 11 coupling mechanism 12 projection 13 recess 14 pressing member 15 first floating gap 16 second floating gap 18 leaf spring member A segment

Claims (2)

[Claims] 1. A nut runner of a bolt-nut fastening device for rotating a nut and fastening it to a bolt, the rotating shaft being driven to rotate, and the rotating shaft being a separate body from the rotating shaft. A nut socket for holding a nut is supported on one side in the axial direction through a connecting mechanism, and the connecting mechanism includes a protrusion provided on one of the rotating shaft or the nut socket, and the rotating shaft or the nut socket. And a recessed portion that is provided on the other side of the recessed portion and that fits into the protruding portion, and that a floating gap that allows the nut socket to move in the radial direction is provided between the periphery of the protruding portion and the recessed portion. A nut runner of the characteristic bolt and nut fastening device. 2. The bolt / nut fastening according to claim 1, further comprising a spring member for urging the nut socket holding the nut in a direction in which its axis coincides with the axis of the rotary shaft. Equipment nutrunner.