JPH052260Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a bolt fastening machine for an automatic segment assembly device that connects and assembles segments lined in a tunnel, for example, with bolts and nuts. The present invention relates to a bolt fastening device for an automatic segment assembly device having a structure for simultaneously tightening two sets of bolts and nuts arranged vertically.

[Prior Art] A segment is formed into an arc shape as shown in Fig. 2, and a flange 2 having one bolt hole 1 is provided at the end in the axial direction, and a flange 2 having a bolt hole 1 in the thickness direction is provided at the end in the circumferential direction. Flange 5 with bolt holes 3 and 4 on the top and bottom
is provided. And these flanges 2,
Bolt holes 7 and 8 are formed inside the segment 5 and open to the inner surface of the segment 6. From these bolt holes 7 and 8, bolt holes 1 or 3 and 4 of the overlapping flanges 2 and 2 or 5 and 5 are formed. The segments 6 are assembled by passing bolts through them and tightening nuts onto these bolts to connect the segments 6 end to end.

In order to assemble this segment automatically, the flanges 2 at the axial ends are placed one on top of the other, a bolt is passed through the bolt hole 1, the head of the bolt is fixed with one arm, and a nut is attached to the other arm. A device (No. 60-263674) is already known in which the socket is rotated and tightened.

[Problems to be solved by the invention] However, since the above device was constructed for the purpose of automatically tightening a set of bolts and nuts, the flange 5 at the circumferential end of the segment
It could not be used to tighten two sets of bolts and nuts attached to the

Therefore, the present applicant et al. provided one socket with two engagement holes into which the head of the bolt engages, provided the other socket with a socket for rotating two nuts, and drove these sockets to rotate in the same direction. For this reason, an application was previously filed for a device in which gears are formed on both sockets, a driving gear is connected to one gear, and an intermediate gear is interposed between both gears, although this has not yet been published (Utility Application No. 113403/1983). ).

However, this device uses a gear to rotate two sockets at the same time to fully tighten both sockets, which increases the torque and increases the size of the motor.Also, when one nut is tightened, rotation stops. There was a tendency for the other nut to be insufficiently tightened. In addition, because the upper and lower sockets use intermediate gears to rotate in the same direction, the distance between the upper and lower bolts cannot be reduced below a certain limit, and in the case of segments with small thickness and small bolt distances, The problem was that it could not be used.
On the other hand, if the gears are made smaller in order to achieve miniaturization, the strength decreases, making it impossible to achieve miniaturization.

An object of the present application is to solve the above-mentioned problems and provide a bolt fastening device that can reduce the size of the motor and arm, and can sufficiently tighten both nuts.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a flange having bolt holes at the top and bottom in the thickness direction at the end of the segment, and a bolt tightening hole is formed inside the flange. , a device for assembling segments by tightening bolts and nuts inserted into the upper and lower bolt holes from the bolt tightening holes, which have upper and lower engagement holes into which the heads of the bolts are engaged; a bolt support arm that is inserted into one bolt tightening hole and inserts the bolt into the upper and lower bolt holes;
A nut support arm that is provided to be openable and closable with respect to the bolt support arm and has a rotatable socket on the top and bottom that is inserted into the other bolt tightening hole and tightens a nut on the bolt, and the lower socket is rotationally driven by a gear. It is equipped with a main tightening mechanism and a pre-tightening mechanism which rotates the upper socket in the same direction as the lower socket by means of a chain.

[Operation] One arm engages the heads of two bolts with the engagement holes to support the bolts, and inserts these bolts from one bolt tightening hole into the upper and lower bolt holes of the flange. The other arm engages and supports two nuts in the socket, these nuts are opposed to the bolt extending from the bolt hole into the other bolt tightening hole, and a gear-driven final tightening mechanism and a chain-driven Both nuts are rotated and tightened at the same time using the pre-tightening mechanism. The torque of the preliminary tightening mechanism that rotates the upper socket is set to be smaller than that of the final tightening mechanism that rotates the lower socket. After final tightening of the lower nut is completed, replace the lower socket with the upper nut and perform final tightening.

In this way, since one socket is used for final tightening and the other socket is used for preliminary tightening, the torque is smaller than when both sockets are used for final tightening, and the motor can be made smaller. Further, by replacing the lower socket with the pre-tightened upper nut and finally tightening it, both nuts can be sufficiently tightened. Since the drive mechanisms for both sockets are separate systems, the intermediate gear that was required between both sockets is no longer required.

[Example] An example of the present invention will be described below in detail based on the accompanying drawings.

In Figure 1, 6 and 6' are segments;
A flange 5 having bolt holes 3 and 4 on the upper and lower sides in the thickness direction is attached to the end thereof, and a bolt tightening hole 8 is formed inside the flange 5 and opens inside the segments 6 and 6'. The two segments 6, 6' are connected to two sets of bolts 9, 10 through the bolt holes 3, 4 with the flanges 5 superimposed on each other.
and are connected by tightening nuts 11 and 12. In general, a shield excavator has a segment carrying section 13 consisting of an erector etc. that supports a new segment (on the left) and transports it to an existing segment (on the right). An automatic segment assembly device 14 for tightening the segments is attached to the segment transporter 13.

The segment automatic assembly device 14 includes the bolts 9,
10, and a nut support arm 16 that supports nuts 11, 12. The base ends of these arms 15, 16 are connected to the frame 1.
It is slidably attached to a horizontal guide rod 18 attached to 7. A first cylinder 19 is attached to the pedestal 17, which connects a piston rod 19a to a bracket 20 protruding from the upper end of the nut support arm 16 to move and position the nut support arm 16 along a guide rod 18. 20 connects the piston rod 21a to the upper end of the bolt support arm 15 and connects it along the guide rod 18 to the nut support arm 16.
A second cylinder 21 is attached to the cylinder 21 for positioning by moving toward and away from the cylinder.

The above arms 15 and 16 are tightened through bolt holes 8 on the left and right.
A vertical guide rod 22 for guiding the pedestal 17 up and down is attached to the segment carrying section 13 via a bracket 23 in order to position it so that it can be freely inserted into the segment carrier 13.
A third cylinder 24 is attached to the piston rod 24 for connecting the piston rod 24a to the pedestal 17 and moving it up and down for positioning.

At the inner side of the tip of the bolt support arm 15 facing the nut support arm 16, there are engagement holes in which the heads 9a, 10a of the bolts 9, 10 engage, at positions facing the upper and lower bolt holes 3, 4. 25, 26 are formed in the nut support arm 16 at a position facing the engagement holes 25, 26 of the bolt support arm 15, engagement holes 27a, into which the nuts 11, 12 are engaged.
Nut tightening sockets 27, 28 with 28a
is rotatably mounted via bearings 29 and 30. The lower socket 28 located at the tip of the nut support arm 16 is connected to a final tightening mechanism 31 that rotates the nut using gears, and the upper socket 27 is connected to a pre-tightening mechanism 32 that rotates the nut using a chain. has been done. That is,
A driven gear 33 is formed at the base of the lower socket 28, and a driving gear 34 is connected to the driven gear 33 via an intermediate gear 35 to constitute a final tightening mechanism 31. The drive gear 34 is attached to a rotating shaft 37 of a motor 36 attached to the base end of the nut support arm 16. The intermediate gear 35 is rotatably mounted on a shaft 38 fixed to the nut support arm 16 via a bearing 39, and the base of the upper socket 27 is rotatably mounted on the tip of the shaft 38 via a bearing 29. is supported by

A driven sprocket 40 is attached to the base of the upper socket 27, and the rotation shaft 37 of the motor 36
A drive sprocket 41 is attached to the tip of the drive sprocket to form a pre-tightening mechanism 32 via a torque limiter 42 that allows the drive sprocket to idle at a predetermined torque or higher.
This driving sprocket 41 and driven sprocket 4
An endless chain 43 is wound around 1 and 1.
Note that the torque limiter 42 is set to operate at a predetermined torque or higher in order to prevent the chain 43 from breaking.

Next, the operation of the embodiment will be described.

When connecting the new segment 6 to the existing segment 6', the heads 9a, 1 of the bolts 9, 10 are inserted into the engagement holes 25, 26 of the bolt support arm 15.
0a and the socket 2 of the nut support arm 16
7 and 28 are engaged with nuts 11 and 12, respectively, in advance. After positioning the new segment 6 with respect to the existing segment 6' so that these flanges 5 overlap, the third cylinder 24 connects these arms 15 and 16 to the bolt tightening hole 8 of the new segment 6 and the existing segment 6. ', insert the bolts 9 into the bolt tightening holes 8, respectively.
10 and the bolt holes 3 and 4 are aligned. Next, the nut support arm 16 is moved by the first cylinder 19 to position the nuts 11 and 12 near the bolt holes 3 and 4, and the motor 36 is moved.
While rotating the upper and lower sockets 27 and 28, the bolt support arm 15 is rotated by the second cylinder 21.
is moved close to the nut support arm 16 and the bolts 9, 10 are inserted into the bolt holes 3, 4 of the flange 5, whereby the nuts 11, 12 are inserted into the bolt holes 3, 4 of the flange 5.
0 and tightened.

When the upper socket 27 reaches a predetermined torque, its rotation is stopped by the torque limiter 42 to complete the pretightening of the upper nut 11, and the lower socket 28 is applied with maximum torque by the gear from the motor 36 to tighten the lower nut 12. Perform final tightening.
After the final tightening of the lower nut 12 is completed, the motor 3
6, and the first and second cylinders 19, 21
The arms 15 and 16 are moved away from each other to remove the heads 9 of the bolts 9 and 10 from the engagement holes 25 and 26.
a, 10a and the nuts 11, 12 from the sockets 27, 28, respectively, and remove the third cylinder 2.
4, the arms 15 and 16 are raised to position the lower socket 28 on the upper nut 11. Next, both arms 15 and 16 are moved closer to each other, and the head 9a of the upper bolt 9 is inserted into the lower engagement hole 26.
and the upper nut 11 is engaged with the lower socket 28, respectively, and the upper nut 11 is connected to the motor 3.
Completely tighten by driving step 6.

In this way, the two sets of bolts 9, 10 and nuts 11, 12 can be fully tightened, respectively.

In order to ensure the support of the bolts 9, 10 and nuts 11, 12 of the arms 15, 16, the engagement holes 25, 26 of the bolt support arm 15 and the engagement holes 27a, 28a of the sockets 27, 28 are provided with magnetic material. A magnet may be attached to attract the bolt heads 9a, 10a and the nuts 11, 12, which are made up of bodies.

Note that instead of rotating the sprocket 40 via a chain to drive the socket using the sprocket 41, gears are attached to the shaft 37 and the upper socket 27, respectively, and an intermediate gear is disposed between them to rotate the upper socket 27. It's okay.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) Since the lower socket is driven by a gear-type final tightening mechanism and the upper socket is driven by a pre-tightening mechanism such as a chain, the torque is smaller than when both sockets are driven by a final tightening mechanism. , the motor can be made smaller.

(2) Furthermore, final tightening can be performed by replacing the lower socket with the pre-tightened upper nut, so both nuts can be sufficiently tightened.

(3) Since the drive mechanisms for both sockets are separate systems,
The intermediate gear that was required between both sockets is no longer required, and the arm can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a perspective view of a segment. In the figure, 3 and 4 are bolt holes, 5 is a flange, 6,
6' is the segment, 8 is the bolt tightening hole, 9, 10
is the bolt, 9a and 10a are the bolt heads, 11,
12 is a nut, 15 is a bolt support arm, 16 is a nut support arm, 25 and 26 are engagement holes, 27,
28 is a socket, 31 is a main tightening mechanism, and 32 is a preliminary tightening mechanism.

Claims (1)

[Scope of utility model registration request] In a bolt fastening device for fastening flanges having bolt holes at the top and bottom with bolts and nuts,
A bolt fastening device comprising: a bolt support arm having upper and lower engagement holes into which the head of the bolt engages, and for inserting the bolt into the upper and lower bolt holes from one side of the overlapping flanges; a nut support arm which is freely opened and closed relative to the bolt support arm and has upper and lower rotatable sockets which fasten the nut to the bolt from the other flange side; a main tightening mechanism which rotates the lower socket using a gear; and a pre-tightening mechanism which rotates the upper socket in the same direction as the lower socket.