JPS6219334A - Nut rotating device used in automatic bolt tightening machines - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a nut used in an automatic bolt fastening machine for automatically screwing together a bolt and a nut that have been pulled in milligrams in advance in opposite directions to flanges to be connected. This relates to rotating equipment JD.

[Prior Art] For example, when assembling segments into a tunnel by using a shield excavator to complete the lining, the flanges on the end faces of the segments to be assembled are fastened together with bolts and nuts. There is no device that automatically performs bolt fastening in a narrow space such as when assembling segments, and bolt fastening work has been performed exclusively by hand.

Therefore, recently, the bolt and nut are automatically connected by engaging a bolt and a nut that have been placed facing each other on the flange part to be connected by yR, and rotating the nut while laterally feeding the bolt in the direction of 1~. An automatic bolt fastening machine has been developed that is designed to perform screw-fastening. That is, the above-mentioned automatic bolt fastening machine has a configuration as shown in FIGS. 3 to 5. The figure shows a case where the method is applied to joining segments. A bolt hole 4 is formed in a flange 2 formed by providing a flange hole 3 on the peripheral edge of the segment 1, and a grip part 5a is rotatably attached to one flange 2a of the flange 2 via a pedestal 7 in advance. The nut 5 is attached to the other flange 2b via a holder 8 made of a leaf spring so as to be movable in the axial direction of the nut 5 in advance, and a pole 1 and a hole 6 are opposed to each other. Pol]・The fastening machine is Pol 1 above.
In order to connect the flanges 2a and 2b with each other by engaging the bolt 6 with the nut 5 and rotating the nut 1-, the bolt 6 is pivoted and supported in parallel with the bolt 6. The guide frame 9 is provided with a bolt engaging arm 10 and a nut engaging arm 11 whose tips extend toward the flange 2 so as to be movable toward and away from each other along the guide frame 9. ing. In the illustrated example, as shown in FIG. 3 and FIG. The pedestal 13 is for installing cylinders 14.15, which are engaging arm moving means for moving the engaging arms 10.11, respectively. Flat leg portions 13a and 13b are provided at the portion.

A guide hole 16 through which the rod 12 of the guide frame 9 is inserted is formed at the base end of the engaging arms 10, 11, and the operating rods 10a, 11a extend upward to pass through the pedestal 13 and are integral with the rod 12 of the guide frame 9. It is set up as follows. therefore,
The mount 13 has operating rods 10a and 11a passing through it.
A guide groove 17 is formed along the longitudinal direction to allow movement of the . Further, each operating rod 10a, 1
1a, piston rods 14a of cylinders 14 and 15 each fixed on a pedestal 13 via a bracket 18;
15a (7) The distal ends tfi are connected, so that the engaging arms io and ii can be moved by driving the cylinders 14 and 15, respectively.

A bolt engagement hole 19 is formed in one of the opposed distal ends of the engagement arms 10 and 11 to detachably engage with the head 6a of the bolt 6 in order to restrict its rotation; At the other end, a nut rotating tool 20 is provided which detachably engages with the nut 5 to rotate it. As shown in FIG. 5, the nut 1 to the rotary tool 20 are made of driven gears having an external gear part 20a at the center in the width direction, and a socket part 20b for engaging the nut 5 is formed in the shaft core part. Nut engaging arm 11 for attaching this nut rotation Q20
constitutes a gear casing, and a nut rotating tool 20 is rotatably housed in the tip via a bearing 21. A motor 23 having a drive gear 22 fixed to a rotating shaft 21a is fixed to the base end of the neck 1 to the engagement arm 11 as a rotation drive means for rotationally driving the nut rotating tool 20. It is rotatably supported within the joint arm 11 via a bearing 24.

Further, the drive gear 22 of the nut engaging arm 11 and the nut rotating tool 2
0, an intermediate gear 25 that meshes with both is rotatably mounted via a bearing 2G.

Note that the motor 23 is attached to one leg 13a of the pedestal 13.
A motor insertion window 27 is formed to avoid interference with the motor. Further, the other leg portion 13b of the pedestal 13 is fixed to a support base 28 for installing the automatic bolt fastening machine having the above-mentioned structure on an erector of a shield excavator or the like.

When bolting is performed using the automatic bolt tightening machine having the above configuration, the automatic bolt tightening modified body is brought close to the segment 1, and the bolt engaging arm 1 having the bolt engaging hole 19 is
0 and the tip of the nut engaging arm 11 are inserted into the respective 7 flange holes 3 of the segment 1, and the axis of the pole 1-engaging hole 19 is aligned with the axis of the bolt 6. Next, bolt engagement arm 1
14 and 15 for each cylinder for the 0 and nut engaging arms.
The head 6a of the bolt 6 is inserted into the bolt engagement hole 19, and the nut 5 is moved closer to each other by the drive of the rotating tool 20.
are engaged with the socket portions 20b of the respective sockets 20b. in this case,
The head 6a of the pole h6 is fixed in advance with the holder 8 in a state that matches the shape of the pole 1-engaging hole 19, and the nut 5 is pressed against the nut 5 while rotating the neck 1-rotating tool 20 at a low speed. By doing so, they can be engaged with each other.

Next, the nut rotation 20 is rotated by driving the motor 23 via the driving gear 22 and the intermediate gear 25, and in this state, the bolt 6 is rotated in the T-5 direction by driving the cylinder 14 via the bolt engaging arm 10. The shaft is fed against the elastic force of the holder 8. As a result, the pole 1-6 approaches the rotating nut 5 and is screwed into the nut 5, thereby fastening the flanges 2a and 2b of the segment 1 to each other with a constant tightening torque. When bolt tightening is completed, the power to the motor 23 is turned off, and the bolt engaging arm 10 and nut engaging arm 11 are separated from each other by the drive of the cylinder 14, 15, and engaged with the head 6a of the bolt 6 and the nut 5. , and then pull the entire automatic bolt fastening machine away from segment 1.

[Problems to be solved by the invention] As mentioned above, the recently considered bolt
The Iil fastening machine automatically rotates the nut and automatically moves the bolt to automatically thread the bolt and nut together, making it easy to bolt the flanges to be connected. 20 has a gear part 20a and a socket part 20b as an integral structure, so if the axis of the nut 5 is shifted from the axis of the socket part 21b, it is thought that the nut 5 will be difficult to fit into the socket part 21b. .

Therefore, in order to further improve the performance of the recently considered automatic bolt tightening machine, the present invention improves the nut rotating tool so that even if the axis of the nut is misaligned, it can easily enter the socket. The purpose is to ensure that bolts and nuts can be automatically fastened.

[Means for Solving the Problems] The present invention provides a socket part that is separate from the gear and is fitted inside a socket part rotation gear rotatably housed in a casing with a gap provided between the two. A universal joint with a spring interposed therebetween and engaged with the socket part so that the rotating direction is unified is engaged with the gear so that it can swing freely and rotate as a unit, thereby creating a socket. The part is supported on m car.

The structure is designed to maintain

[Function] Since the socket I part is supported by the socket part rotation gear via the universal joint, the socket part 1 can be connected to L% Ut via the unipart length joint.

Therefore, when the nut pushes against the socket part, the universal joint tilts and the conical coil spring deforms, displacing the socket part so that it can fit with the nut.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a casing 30 (for example, the snap engaging arm 11 in FIG. 3) is provided with teeth 32 on its outer periphery and a hollow interior with a stepped portion 33 and a stopper 34. A socket surface conversion gear 31 provided near the end is rotatably housed via a bearing 35, and a tapered portion 3 is provided on the inner periphery of the front end in an opening 36 in front of the stepped portion 33 in the tooth fi31.
8 and has an outer diameter smaller than the inner diameter of the opening 3G so as to form a required gap with the opening 36 of the gear 31, and has a stepped portion 39 on its outer periphery. 37 to the insertion position. A conical coil spring 40 is interposed between the stepped portion 33 inside the gear 31 and the stepped portion 39 of the socket portion 37.
0, the socket portion 37 is centered, and when external pressure is applied to the tapered portion 38 of the socket portion 37, the conical coil spring 40 is deformed. The above socket part 3
One end of a universal joint 41 is engaged with the rear end of the gear 31 so as to be able to swing freely, and the other end of the universal joint 41 is engaged with the rear end of the gear 31. The gear 31 is engaged with the rear end so that it can swing freely and rotate together, and the collar 34 inside the gear 31 is located in the recess in the middle part of the universal joint 41.
The movement of a universal joint 41 between a gear 31 and a socket part 37 can be restricted. 42 is Natsu.

In a state where the casing 30 and the nut 42 are displaced relative to each other and the socket portion 37 engages with the nut 42, if the axis of the socket portion and the axis of the nut 42 are misaligned, the taper portion 38 of the socket portion 37 This corresponds to the outer diameter part of the nut 42. Furthermore, when the socket part 37 moves in the direction of the nut 42 together with the casing 30, the tapered part 38 moves toward the nut 42.
It will be pushed by the outer diameter of the When the tapered portion 38 is pushed by the outer diameter portion of the nut 42, the universal joint 4
1 tilts as shown in FIG. 2, the conical coil spring 40 deforms, and the socket portion 37 moves in parallel. As a result, the axes of the nut 42 and the socket portion 37 are aligned, and the socket portion 37 is adapted to and engaged with the nut 42.

The nut rotating device of the present invention can be implemented as an automatic bolt fastening machine by using it in place of the nut rotating tool 20 in the automatic bolt fastening machine shown in FIGS. 3 to 5. When the gear 31 is rotated after the socket part 31 is fitted into the nut 42, the socket part 31 is rotated via the universal joint 41.

Note that FIGS. 3 to 5 show a case in which the nut rotating device of the present invention is applied to an automatic bolt tightening machine that tightens bolts for segment 1 as an object to be fastened. Of course, the present invention can be applied to a fastening machine used for fastening objects other than segments.

[Effects of the Invention] As described above, according to the nut rotating device of the present invention, since the socket portion can be displaced via the universal joint i~, it is possible to avoid misalignment between the axis of the nut and the axis of the socket. Even if the nut hits the socket part, the socket part automatically moves to fit the nut, and the socket part and the nut can be easily connected. When applied to an automatic bolt tightening machine, Automatic bolt fastening of objects to be fastened can be performed more reliably.

[Brief explanation of the drawing]

Figure 1 is a cutaway plan view of the neck 1 to rotation device of the present invention, and Figure 2 is a cutaway plan view of the
The figure is a cross-sectional view showing the state when the socket part moves, Figure 3 is a partially cutaway side view of a recently considered automatic bolt tightening machine, Figure 4 is a plan view of Figure 3, and Figure 5 is A in Figure 4
-A sectional view. 5 is a nut, 6 is a bolt, 10 is a bolt engaging arm, 11 is a nut engaging arm, 30 is a casing, 31 is a gear for rotating the socket part, 37 is a socket part, 40 is a conical coil spring,
41 indicates universal join 1-. Patent application Hitoshi Kawajima Harima Heavy Industries Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 ILIo 1'J 12 1101b 1'3
00a

Claims (1)

[Claims] 1) A socket separate from the gear is fitted into the inside of the rotating gear rotatably housed in the casing, with a gap interposed between the two, and a spring is interposed between the two; A nut rotating device for use in an automatic bolt fastening machine, characterized in that a universal joint is engaged with the gear so as to be able to swing freely and rotate together as a unit. .