JP2016059987A - Fastening mechanism and fastening method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability for fastening a bolt and a nut.SOLUTION: A fastening mechanism 1 receives rotating power of a bolt rotation member 3 fitted into an end portion Saand fastening a bolt Sa inserted into a screw hole Ma to the screw hole by a fastening force of a nut Sb, and comprises: a main body section 6 that has a through-hole 7 which is formed therein and via which the bolt rotation member 3 penetrates the main body section 6 from one end 6c to the other end 6c, and that is provided with a holding part 8 formed on one end 7a of the through-hole and holding the nut mated with the bolt while restricting the movement of the nut in a rotation direction; and a support section (offset gear 5) rotatably supporting the main body section.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fastening mechanism and a fastening method for fastening a nut after positioning a bolt.

  Conventionally, so-called set bolts are used for positioning between members. For example, in Patent Document 1, in a processing apparatus that processes a fluid pipe, a set bolt including a bolt and a nut is provided in a stepping mechanism that moves the fluid pipe.

  Here, a plurality of set bolts are arranged on the radially outer side of the fluid pipe so as to be spaced apart in the circumferential direction, and the set bolt presses and fixes the fluid pipe toward the radially inner side. Further, the position of the set bolt can be adjusted in accordance with the outer diameter of the fluid pipe by changing the screwing depth into the screw hole.

Japanese Patent No. 4895444

  Specifically, the mounting of the set bolt is screwed into the screw hole with a tool, and then the nut is screwed into the bolt with a tool, and the bolt and the nut are fixed to the fastening member. At this time, when a sufficient space cannot be secured on the radially outer side of the nut, a tool that extends the shaft portion from the socket, such as a box wrench, is used for the nut.

  When such a tool is used, if the nut tool is attached to the nut at the same time that the bolt tool is attached to the bolt, both tools interfere with each other. In order to avoid interference, after the bolt is screwed into the screw hole, the bolt tool is once separated from the bolt, and then the nut tool is attached to the nut and the nut is screwed into the bolt. As a result, work efficiency has deteriorated as much as the bolt tool is separated from the bolt. Such a decrease in workability becomes a factor in delaying tact time, particularly when the work is automated by attaching a tool to a mechanical device or the like. Thus, there is a demand for the development of a fastening mechanism that improves workability by avoiding interference between tools.

  An object of the present invention is to provide a fastening mechanism and a fastening method capable of improving the workability of fastening bolts and nuts.

  In order to solve the above-described problem, the fastening mechanism of the present invention, which receives the rotational power of a bolt rotating member fitted to the end portion and fastens the bolt inserted into the screw hole to the screw hole by the fastening force of the nut. A body having a through hole through which a bolt rotating member is inserted from one end to the other end, and a holding portion that holds the nut screwed to the bolt while restricting movement in the rotation direction at one end of the through hole. And a support part that rotatably supports the main body part.

  The support part is arranged coaxially with the central axis of the nut, and is arranged with the first rotary body that rotates the main body part around the central axis of the nut and the first rotary body different from the rotational axis, and receives external force. A second rotating body that rotates and transmits rotational power to the first rotating body.

  In order to solve the above-described problem, the fastening method of the present invention includes a holding portion provided at one end of a through hole in a main body portion that is rotatably supported by a support portion and has a through hole formed from one end to the other end. In addition, the nut screwed to the bolt is regulated and held in the rotational direction, the bolt rotating member is inserted into the through hole from the other end of the main body, and the bolt rotating member is fitted to the end of the bolt. The bolt rotating member and the main body are rotated together, the bolt is rotated together with the nut, the bolt is inserted into the screw hole, the rotation of the bolt rotating member is stopped, and then the main body is further rotated to turn the bolt into the nut. It is characterized in that it is fastened to the screw hole with a fastening force of.

  According to the present invention, workability for fastening bolts and nuts can be improved.

It is explanatory drawing for demonstrating a fastening mechanism. It is explanatory drawing for demonstrating the fastening method by a fastening mechanism.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is an explanatory diagram for explaining the fastening mechanism 1. As shown in FIG. 1, the fastening mechanism 1 is a mechanism for fastening a so-called set bolt S to a screw hole Ma formed in the fastened member M.

  Specifically, the set bolt S includes a bolt Sa and a nut Sb. The fastening mechanism 1 inserts the bolt Sa into the screw hole Ma, positions the bolt Sa in the insertion direction, and then sets the nut Sb. Then, the bolt Sa is fastened to the fastened member M.

  The fastening mechanism 1 includes a nut rotating member 2 and a bolt rotating member 3, and is a mechanical device fixed to a movable stage (not shown). The fastening mechanism for the fastened member M is moved by moving the movable stage. The relative position of 1 can be displaced.

  Further, the bolt rotating member 3 moves independently of the nut rotating member 2 in the vertical direction (in the direction of the central axis of the bolt Sa) indicated by a double arrow in FIG.

  The nut rotating member 2 includes a nut runner 4 and an offset gear 5 (support portion). The nut runner 4 is driven by electric power or air pressure, and transmits rotational power to the offset gear 5.

  The offset gear 5 is configured by incorporating a plurality of gears 5b to 5d inside a housing 5a. Among these gears 5b to 5d, the gear 5b (first rotating body) closest to the nut Sb is arranged coaxially with the central axis of the nut Sb.

  Further, the gear 5c (second rotating body) closest to the nut runner 4 has a rotating shaft different from that of the gear 5b, is arranged coaxially with the rotating shaft of the nut runner 4, is connected to the nut runner 4, and the nut runner 4 It rotates by receiving rotational power (external force).

  The rotational power transmitted from the nut runner 4 to the gear 5 c is transmitted to the gear 5 b via the other gear 5 d inside the offset gear 5.

  Moreover, the nut rotation member 2 has the main-body part 6 whose outer shape is cylindrical. Here, the main body portion 6 is formed by connecting a base portion 6a and an extending portion 6b in the central axis direction. The base 6a and the extension 6b are fixed to each other and integrated.

  A through hole 7 is formed in the main body 6 so as to penetrate from one end 6 c to the other end 6 d in the central axis direction of the main body 6. A holding portion 8 is provided at one end 7 a of the through hole 7.

  The holding portion 8 is a hole that is recessed from the one end 6 c of the main body portion 6 toward the other end 6 d side, and one end 7 a of the through hole 7 is opened on the bottom surface of the holding portion 8. And the holding | maintenance part 8 is the same shape as the external shape (for example, hexagon) of nut Nb in the cross-sectional shape perpendicular | vertical to the central axis of the main-body part 6. FIG.

  Therefore, the nut Sb fitted and held in the holding part 8 is restricted by the holding part 8 from moving in the rotational direction. That is, when the holding unit 8 rotates, the nut Sb rotates with the holding unit 8.

  The base portion 6a of the main body portion 6 is inserted into a gear 5b disposed in the housing 5a of the offset gear 5, and is fixed to the gear 5b. Two bearings 9 are provided in the housing 5 a of the offset gear 5. The two bearings 9 are arranged with the gear 5 b sandwiched in the rotational axis direction of the gear 5 b, and the extending portion 6 b of the main body 6 is rotatably supported by the two bearings 9.

  And the gear 5b will rotate the main-body part 6 around the central axis of the main-body part 6, if the rotational power from the nut runner 4 is transmitted. At this time, in a state where the nut Sb is held by the holding portion 8, the central axis of the main body 6 is positioned coaxially with the central axis of the nut Sb. For this reason, the nut Sb held by the holding portion 8 rotates around the central axis of the nut Sb.

  The bolt rotating member 3 includes a servo motor 10 and a shaft 11. The servo motor 10 is driven by electric power or air pressure and transmits rotational power to the shaft 11.

  The shaft 11 has, for example, a hexagonal prism shape, one end is fixed to the servo motor 10, receives rotational power from the servo motor 10, and rotates with the central axis of the shaft 11 as a rotation axis. Further, the shaft 11 has such a dimension that it can be inserted into the through hole 7 formed in the main body portion 6 of the nut rotating member 2.

  As described above, the bolt rotating member 3 can move independently of the nut rotating member 2, and the bolt rotating member 3 moves downward in FIG. It can be inserted into the through hole 7.

The end portion Sa ₁ of the bolt Sa is formed hexagonal hole shaft 11 is fitted. In a state where the bolt Sa is screwed with a nut Sb, by inserting the shaft 11 into the through-hole 7, it is possible to fit the shaft 11 into the hexagonal hole of the end portion Sa _1.

When the shaft 11 is fitted to the end portion Sa ₁ , the bolt Sa receives the rotational power of the servo motor 10 and rotates integrally with the shaft 11.

  Next, a method for fastening the set bolt S using the fastening mechanism 1 will be described in detail.

  FIG. 2 is an explanatory diagram for explaining a fastening method by the fastening mechanism 1. In FIG. 2, the illustration of the nut runner 4, the offset gear 5, and the bearing 9 disposed in the housing 5 a of the offset gear 5 in the nut rotating member 2 is omitted for easy understanding.

  First, the nut Sb is screwed to the bolt Sa, and the holding portion 8 holds the nut Sb screwed to the bolt Sa in a state where movement in the rotational direction is restricted, as shown in FIG. The fastening mechanism 1 (the nut rotating member 2 and the bolt rotating member 3) is moved to a position where the bolt Sa faces the screw hole Ma of the fastened member M. At this time, the shaft 11 of the bolt rotating member 3 is inserted from the other end 6 d side of the main body 6 of the nut rotating member 2 to the middle of the through hole 7.

  Then, as shown in FIG. 2B, the fastening mechanism 1 (the nut rotating member 2 and the bolt rotating member 3) is moved to the screw hole Ma side in the rotation axis direction of the bolt Sa, and the screw hole Ma is moved to the bolt. Sa is brought into contact.

Subsequently, as shown in FIG. 2C, the bolt rotating member 3 is moved to the screw hole Ma side in the direction of the rotation axis of the bolt Sa. Then, the shaft 11 of the bolt rotating member 3 is further inserted through the through hole 7 of the main body 6 and the shaft 11 is fitted into the end portion Sa ₁ of the bolt Sa. Even after the fitting, the bolt rotating member 3 presses the bolt Sa toward the screw hole Ma.

  Thereafter, as shown in FIG. 2 (d), the main body 6 that is rotatably supported by the bearing 9 (see FIG. 1) is rotated while the bolt Sa is rotated together with the bolt rotating member 3, whereby the holding portion 8 is rotated. Rotate the nut Sb held by the nut. At this time, the main body 6 of the nut rotating member 2 and the shaft 11 of the bolt rotating member 3 are integrally rotated synchronously to rotate the bolt Sa and the nut Sb integrally. As described above, since the bolt Sa is pressed toward the screw hole Ma, the bolt Sa is inserted while being screwed into the screw hole Ma.

  Then, as shown in FIG. 2E, the bolt Sa and the nut Sb are rotated while pressing the bolt Sa toward the screw hole Ma until the bolt Sa reaches the preset insertion position.

  Subsequently, as shown in FIG. 2 (f), the rotation of the bolt rotating member 3 is stopped, and the main body 6 is further rotated, whereby the nut Sb is screwed onto the bolt Sa. Then, when the nut Sb comes into contact with the fastened member M, the nut Sb is temporarily tightened.

  Thereafter, as shown in FIG. 2 (g), the bolt rotating member 3 is moved in the direction of the axis of rotation of the bolt Sa to the side away from the screw hole Ma, and the main body 6 is further rotated to thereby rotate the bolt Sa. Then, the nut Sb is screwed, and the bolt Sa is fastened to the screw hole Ma by the fastening force of the nut Sb (final tightening).

  Then, as shown in FIG. 2 (h), the fastening mechanism 1 (the nut rotating member 2 and the bolt rotating member 3) is moved in the direction of the axis of rotation of the bolt Sa toward the side away from the screw hole Ma, and the fastening process is performed. Ends.

Thus, the fastening method according to the fastening mechanism 1 of this embodiment, the bolt Sa inserted into the screw hole Ma receives a rotational power of the bolt rotating member 3 is fitted into the end portion Sa _1, the fastening nut Sb Fastened to the screw hole Ma by force.

  Since the through-hole 7 is formed in the main-body part 6 at this time, the shaft 11 can be inserted in the through-hole 7, and the volt | bolt Sa and the nut Sb can be rotated simultaneously. Therefore, there is no need to retract the nut rotating member 2 for switching the rotation process of the bolt Sa, and the workability can be improved. In particular, the fastening mechanism 1 is attached to a movable stage, and the operation is automated, so that it is possible to shorten the tact time that is the time spent for one fastening process.

  In the above-described embodiment, the nut rotating member 2 has been described as including the offset gear 5, but the offset gear 5 is not an essential configuration. However, by providing the offset gear 5, when the screw hole Ma of the member M to be fastened is located in a narrow place, the fastening operation of the set bolt S becomes easy, and the nut runner 4 is separated from the main body 6. Since it can arrange | position, the through-hole 7 becomes easy [the arrangement which avoided the nut runner 4].

  Moreover, although the fastening mechanism 1 demonstrated the case where it was a mechanical apparatus fixed to the movable stage not shown in embodiment mentioned above, it is the structure which moves the nut rotating member 2 and the bolt rotating member 3 manually. Also good.

  Moreover, although the fastening mechanism 1 demonstrated the case provided with the nut runner 4 and the servomotor 10 in embodiment mentioned above, it is the structure which rotates the gear 5c and the volt | bolt Sa manually instead of providing the nut runner 4 and the servomotor 10. FIG. There may be.

  In the above-described embodiment, the case where the holding portion 8 is a hole that is recessed from the one end 6 c of the main body portion 6 toward the other end 6 d side has been described. In this case, the holding part 8 is a part of the main body part 6, and the inside of the holding part 8 is a part of the through hole 7. The through hole 7 penetrates from one end 6c of the main body 6 (that is, the inlet end of the holding portion 8) to the other end 6d.

  Moreover, if the holding part 8 can hold | maintain the nut Sb by restrict | limiting the movement of a rotation direction, it will protrude in the center axis direction from the one end 6c of the main-body part 6, for example, and it will be spaced apart in the circumferential direction of the main-body part 6. It may be a protrusion. In this case, one end 6 c of the main body 6 is a base end of the holding portion 8, and the through hole 7 is located at the base end position of the holding portion 8 (that is, One end 6c) extends to the other end 6d of the main body 6.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  INDUSTRIAL APPLICABILITY The present invention can be used for a fastening mechanism and a fastening method for fastening a nut after positioning a bolt.

Ma Screw hole Sa Bolt Sa ₁ End Sb Nut 1 Fastening mechanism 3 Bolt rotating member 5 Offset gear (supporting portion)
5b Gear (first rotating body)
5c Gear (second rotating body)
6 Main body portion 6c One end 6d The other end 7 Through hole 7a One end 8 Holding portion

Claims (3)

A fastening mechanism that receives the rotational power of the bolt rotating member fitted to the end portion and fastens the bolt inserted into the screw hole to the screw hole by the fastening force of the nut,
A through hole through which the bolt rotating member is inserted is formed from one end to the other end, and a holding portion is provided at one end of the through hole to restrict and hold the nut screwed to the bolt in the rotational direction. A main body unit,
A support part for rotatably supporting the body part;
A fastening mechanism comprising: The support part is
A first rotating body that is arranged coaxially with a central axis of the nut and rotates the main body about the central axis of the nut;
A second rotating body that is arranged differently from the first rotating body, rotates by receiving an external force, and transmits the rotational power to the first rotating body;
The fastening mechanism according to claim 1, further comprising: Of the main body part that is rotatably supported by the support part and has a through hole formed from one end to the other end, a nut screwed to a bolt is moved to the holding part provided at one end of the through hole in the rotational direction. Regulate and hold
A bolt rotating member is inserted into the through hole from the other end of the main body, and the bolt rotating member is fitted to an end of the bolt;
The bolt rotating member and the main body are rotated together, the bolt is rotated together with the nut, and the bolt is inserted into the screw hole.
After the rotation of the bolt rotating member is stopped, the bolt is fastened to the screw hole by the fastening force of the nut by further rotating the main body.

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