JPH05345236A - Bolt clamp device of multishaft nut runner - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a bolt clamp device for a multi-axis nut runner in which a clamping device is arranged without interfering with each socket and a force for clamping a bolt is applied to the socket. With the goal. [Structure] A plurality of nut runners provided with a socket that can be fitted with a bolt, and a plurality of bolt chuck holes formed by sharing a part of the hole with a socket through hole and a bolt holding hole are arranged facing the socket. A clamp plate, a clamp plate driving means for moving the clamp plate so that one of the socket through hole and the bolt holding hole faces the socket, and the socket in the socket axial direction with respect to the clamp plate. A bolt clamp device for a multi-axis nutrunner, comprising a biasing means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for clamping a bolt in a socket in a multiaxial nut runner.

[0002]

2. Description of the Related Art In a nut runner, when a nut or a bolt is clamped in a socket, for example, a socket structure disclosed in Japanese Utility Model Laid-Open No. 61-175326 is known. The socket of the above publication is provided with a member that presses the hexagonal portion of the nut on the inner wall of the socket, and the nut can be clamped by inserting the nut into the socket. Detailed structure Figure 9,
This will be described below with reference to FIGS. Nut 26
Chuck head 25 that is the tip of the socket that holds the
A lower end portion 30 of the chuck head 25 is provided with a nut holding hole 31 opening toward the lower end portion of the chuck head 25. The nut holding hole 31 has a circumference of 12 at equal intervals.
Six V-shaped grooves 32 are provided, and six of the V-shaped grooves 32 each have a small hole 3 toward the center of the nut holding hole 31.
2 is open. A steel ball 34 is placed in the small hole 32.
Is inserted, and the small hole 32 allows the steel ball 34 to advance and retreat toward the center of the nut holding hole 31. An annular groove 35 is provided on the outer peripheral portion of the nut holding hole 31 so as to surround the nut holding hole 31, and the annular groove 35 includes:
An elastic pressing member 36 such as an O-ring or a coil spring is fitted over the entire circumference. Since a part of the pressing member 36 is in contact with the steel ball 34, the pressing member 36 presses the steel ball 34 toward the center of the nut holding hole 31 by its elasticity. Next, the nut 26 is attached to the socket having the above configuration.
The operation of fitting the nuts 26 to hold the nut 26 on the chuck head 25 will be described. First, positioning is performed so that the center axes of the nut holding hole 31 of the chuck head 25 and the nut 26 are aligned with each other and that a predetermined gap exists between the nut holding hole 31 and the nut 26. Then, when the chuck head 25 is lowered toward the nut 26, the nut 26 displaces the steel ball 34, a part of which projects from the small hole 32 of the nut holding hole 31 in the central axis direction of the holding hole 31, The nut 26 is fitted in the socket. At this time,
The elastic force of the pressing member 36 fitted in the annular groove 35 acts on the pushed steel ball 34, so that the steel ball 34 moves to the nut 2
The hexagonal part of the nut 6 will be pressed. In this way, the nut 26 is held by the chuck head 25 of the socket.

[0003]

However, if a structure is adopted in which the hexagonal portion of the nut is pressed and clamped in the narrow space of the inner wall of the socket as in the prior art described above, the structure for clamping is restricted. It is not possible to obtain sufficient clamping force. For this reason, the nut may come off from the socket and fall due to a shock or inertia (inertia) during operation of the nut runner, and there is a problem that reliability of the clamp is reduced. In order to increase the reliability of the socket nut clamp, the socket itself is enlarged to eliminate the restrictions on the structure of the clamp structure.
It is possible to increase the clamping force. However, in the multi-axis nut runner, if the socket itself is made large, the sockets may interfere with each other and the multi-axis nut runner may not be configured.
In the nut runner, regardless of whether the member that fits into the socket is a nut or a bolt, the structure of the portion that fits into the socket is the same, so the same problem arises regardless of the nut and bolt. The present invention relates to a clamp device for a multi-axis nutrunner, which comprises a plurality of bolt chuck holes each having a clamp portion and an unclamp portion integrated with
A bolt clamp device for a multi-axis nut runner that drives the sockets while maintaining their relative positional relationship and clamps the bolts to securely clamp the bolts to the sockets without interfering with each other. Aim to get.

[0004]

A technical means for solving the above-mentioned problems is to provide a plurality of nut runners having sockets capable of being fitted with bolts, a socket through hole and a bolt holding hole so that a part of the hole is formed. A clamp plate in which a plurality of common bolt chuck holes are arranged to face the socket, and the clamp plate is moved so that one of the socket through hole and the bolt holding hole faces the socket. A bolt clamp device for a multi-axis nut runner, comprising: a clamp plate drive means for causing the clamp plate surface to urge the socket in the socket axial direction with respect to the clamp plate surface.

[0005]

The sockets of the plurality of nut runners are positioned so as to face the socket through holes of the bolt chuck holes of the clamp plate that holds the bolts. Then, the sockets of all nut runners are in a state of penetrating the socket through holes of the clamp plate by the urging force of the urging means. The nut runner and the clamp plate are moved to the vicinity of the member that supplies the bolt. At that time, the nut runner is positioned so that the socket faces the bolt held by the member that supplies the bolt. Next, the nut runner is moved in the direction perpendicular to the clamp plate surface and in the direction approaching the member supplying the bolt. Then, the socket of the nutrunner approaches the bolt,
The bolt fits into the socket. After fitting, the socket, which is fitted with the bolt that is fixed to the member that supplies the bolt, is positioned by the bolt, and when the nut runner and the clamp plate are moved together, the socket is located between the socket and the nut runner. As the biasing means bends, only the socket slides toward the nutrunner body,
The clamp plate relatively moves from the socket toward the member that supplies the bolt. The clamp plate, the socket, and the bolt are placed in such a positional relationship, and the clamp plate is moved to the clamp plate drive means so that the hole peripheral end of the bolt holding hole provided in the clamp plate comes into contact with the bolt seat surface. Move by. Then, when the nut runner is moved away from the member supplying the bolt, the bolt seating surface abuts the clamp plate surface by the urging force of the urging means. That is, the bolt head is clamped by the socket of the nut runner and the clamp plate surface, and the bolt is held by the socket.

[0006]

EXAMPLES Next, examples of the present invention will be described below with reference to FIGS. First, the device configuration of this embodiment will be described. Bolt clamp unit 19
2, as shown in FIG.
Eight bolt clamp plates 1 arranged so that they form a circle
And one end engages with the outer peripheral portion of the bolt clamp plate 1,
In FIG. 2, a lever 2 movable in two opposite directions, a or b, shown in FIG. 2, a link 4 in which the other end of the lever 2 is engaged with the central portion of the main body, An actuator 3 for operating the link 4 is provided in the two opposite directions a or b. The bolt chuck hole 20 has a socket through hole 12 having a diameter larger than the socket outer diameter as shown in FIG. 7, and a bolt through hole 12 having a diameter larger than the bolt shaft diameter and smaller than the bolt head diameter in FIG. The bolt holding hole 13 as shown in the figure is connected.

As shown in FIG. 1, the nut runner 21 includes a nut runner main body 22, a socket 5 which can be fitted to the bolt 11, and a connecting guide which is connected to the socket 5 so as to be relatively movable in the socket axial direction. 7, and one end is connected to the connection guide 7 and the other end is the nut runner body 22.
And a spring 8 which is arranged between the socket 5 and the shaft 6 and biases the socket 5 and the shaft 6 in directions to separate from each other in the axial direction of the socket. In the bolt clamp unit 19 and the nut runner 21, the socket 5 is connected to one end of the bracket 9 and the nut runner main body 22 is fixed to the other end of the bracket 9 as shown in FIGS. 22 is linked.

Next, the operation of the apparatus of this embodiment will be described. First, as shown in FIG. 5, the bolt 11 is held in the bolt holding plate 23 in a state where the head portion of the bolt is lifted up by several mm by the parts feeder 10 in which a large number of bolts 11 are stored. The socket through-hole 1 of the bolt chuck holes 20 of the bolt clamp plate 1 for holding the bolts 11 is provided with the plurality of sockets 5 in the nut runner 21.
Position so as to face 2. Then, the sockets 5 of all the nut runners 21 are in a state of penetrating the socket through holes 12 of the bolt clamp plate 1 by the biasing force of the spring 8. In this way, the nut runner 21 and the bolt clamp plate 1 are moved to the vicinity of the parts feeder 10 while maintaining the relative positions of the socket 5 of the nut runner 21 and the bolt clamp plate 1. At that time, the socket 5 of the nut runner 21 is positioned so as to face the bolt 11 held by the bolt holding plate 23 of the parts feeder 10. Next, the bolt clamp plate 1
The nut runner 21 and the bolt clamp plate 1 are integrally moved by the bracket 9 connecting the nut runner 21 and the bolt clamp plate 1 in a direction perpendicular to the surface and approaching the bolt holding plate 23.
Then, the socket 5 of the nut runner 21 approaches the bolt 11, and as shown in FIG.
Fits in the socket 5. At the time of fitting, the socket 5 fitted with the bolt 11 fixed to the bolt holding plate 23
Is positioned by the bolt 11, but the nut runner 21 and the bolt clamp plate 1 are further moved integrally by the bracket 9. Then, the spring 8 between the socket 5 and the nut runner main body 22 bends, and as shown in FIG.
Only the socket 5 relatively slides in the direction of 2. That is, the bolt clamp plate 1 relatively moves from the socket 5 to the bolt holding plate 23 side. The bolt clamp plate 1, the socket 5, and the bolt 11 are placed in such a positional relationship, and the lever 2 and the link 4 connected to the bolt clamp plate are operated in the a direction by the actuator 3. Then, the bolt clamp plate 1 rotates in the clockwise direction which is the direction c in FIG. By this operation of the actuator 3, the hole peripheral end portion of the bolt holding hole 13 provided in the bolt clamp plate 1 comes to a position facing the bolt seat surface. And the nutrunner body 2
2 is moved away from the bolt holding plate 23,
The urging force of the spring 8 causes the bolt seat surface to contact the clamp plate. That is, the head of the bolt 11 is sandwiched between the socket 5 of the nut runner 21 and the surface of the bolt clamp plate 1, and the bolt 11 is held by the socket 5.

By the way, in the next step, a step of tightening the bolts 11 on the work to be tightened will be described. First, the socket 5 of the nut runner 21 in the bolt clamp state is positioned at the tightening position. After that, by moving the link 4 in the b direction, the bolt clamp plate 1 is rotated around the central portion of the clamp plate. Then, the socket 5 relatively moves to a position facing the socket through hole 12 which is larger than the socket outer diameter in the chuck hole of the bolt clamp plate 1. By such rotation of the bolt clamp plate 1, contact between the seat surface of the bolt 11 and the bolt clamp plate 1 disappears, and the clamp of the bolt 11 on the socket 5 is released. And by starting the rotation of the socket 5 of the nut runner 21,
The bolt 11 is tightened to the work.

As described above, this device is provided with the bolt clamp plate 1
Since the peripheral end face of the bolt holding hole 13 provided in the abutment is in contact with the seating face of the bolt 11, and the socket 5 presses the head of the bolt 11 by the pressing force of the spring 8,
The bolt 11 is clamped to the socket 5. Therefore,
The bolt 11 can be clamped to the socket 5 in a stable posture. Furthermore, since the socket 5 itself does not have a clamp device and the socket can be made small, the sockets do not interfere with each other, and the bolt chuck holes 20 for clamping the bolts maintain the relative position while the bolts are held. Since the clamping operation is performed, the clamping mechanisms do not interfere with each other.

Further, there is a step of positioning the socket 5 of the nut runner at the bolt tightening position of the work for tightening the bolt 11. Before that, the work 16 can be clamped in advance by the work clamp device 14 as shown in FIG. 4, and then the work 16 can be fastened to the member to be fastened with the bolt 11. The configuration of the work clamp device 14 will be described below with reference to FIG. The work clamp device includes a work support boss 17 that fits into a recess of the work 16 to position the work.
The work clamper 15 includes a work clamper 15 having a claw for chucking a flange portion on the outer periphery of the work 16, and a clamp cylinder 18 that gives a force for causing the work clamper 15 to perform a chucking operation. Next, the clamp operation of the work clamp device will be described. First, the recess of the work 16 is fitted into the work supporting boss 17 to position the work. Then, by moving the work clamp cylinder 18 in the direction of the arrow d, which is the direction in which the nut runner main body is present with respect to the work 16, the work clamper 15 operates in the direction in which the mutual claws approach. Then, the claws of the work clamper 15 contact the flange portion of the work 16, and the work 16 is clamped while being positioned by the work supporting boss 17 and the claws of the work clamper 15.

Other effects of this embodiment will be described below. When the socket 5 and the bolt 11 are engaged with each other, the head of the bolt 11 may not enter the socket 5, but in this case as well, as shown in FIG. It is pinched. Therefore, when the socket 5 of the nut runner is rotated, the shape of the inner wall of the socket 5 and the shape of the head of the bolt match, and the bolt 11 can be fitted into the socket 5.

[0013]

In the clamp device for a multi-axis nutrunner, a plurality of bolt chuck holes of a clamp plate which is arranged to face a plurality of sockets, a socket through hole, and a bolt holding hole for holding a bolt seat surface at a hole peripheral end portion. And part of the holes are shared, and the bolt clamping and unclamping operations can be performed while maintaining the relative positions of the plurality of bolt chuck holes, so that each socket does not interfere with each other.
The bolt can be securely clamped to the socket. Therefore, in the multi-axial nutrunner, it is possible to improve the operating rate of the nutrunner by preventing the bolt from falling from the socket.

[Brief description of drawings]

FIG. 1 is a side view showing a nut runner and a bolt clamp device according to an embodiment of the present invention.

FIG. 2 is a front view showing a bolt clamp device according to an embodiment of the present invention.

FIG. 3 is an overall view showing a nut runner and a bolt clamp device according to an embodiment of the present invention.

FIG. 4 is a side view showing a nut runner and a work clamp device according to an embodiment of the present invention.

5A and 5B are a front view and a side view showing a parts feeder 10 according to an embodiment of the present invention.

FIG. 6 shows a bolt 11 and a socket 5 according to an embodiment of the present invention.
It is a side view which shows a fitting state with.

FIG. 7 is a front view showing the positional relationship between the clamp device and the socket 5 according to the embodiment of the present invention.

FIG. 8: Clamping device and bolt 1 according to an embodiment of the present invention
It is a front view which shows the positional relationship with 1.

FIG. 9 is a side view showing a nut clamp type socket structure according to the prior art.

10 is a sectional view taken along line BB of FIG.

FIG. 11 is a side view showing a nut clamped state of a nut clamp type socket according to the prior art.

[Explanation of symbols]

 1 ・ ・ ・ Bolt clamp plate 2 ・ ・ ・ Lever 3 ・ ・ ・ Actuator 4 ・ ・ ・ Link 5 ・ ・ ・ Socket 6 ・ ・ ・ Shaft 7 ・ ・ ・ Connection guide 8 ・ ・ ・ Spring 9 ・ ・ ・ Bracket 10 ・・ ・ Parts feeder 11 ・ ・ ・ Bolt 12 ・ ・ ・ Socket through hole 13 ・ ・ ・ Bolt holding hole 14 ・ ・ ・ Work clamp device 15 ・ ・ ・ Work clamper 16 ・ ・ ・ Work 17 ・ ・ ・ Work support boss 18・ ・ ・ Work clamp cylinder 19 ・ ・ ・ Bolt clamp unit 20 ・ ・ ・ Bolt chuck hole 21 ・ ・ ・ Nut runner 22 ・ ・ ・ Nut runner main body 23 ・ ・ ・ Bolt holding plate 25 ・ ・ ・ Chuck head 26 ・ ・ ・ Nut 29 ... Hole 30 ... Lower end of chuck head 25 31 ... Nut holding hole 32 ... V-shaped groove 33 And small holes 34 ... steel balls 35 ... annular groove 36 ... press member

Claims (1)

[Claims] 1. A plurality of nut runners provided with sockets that can be fitted with bolts, and a plurality of bolt chuck holes formed by sharing a part of the holes through the socket through holes and the bolt holding holes face the socket. A clamp plate that is arranged, a clamp plate driving unit that moves the clamp plate so that one of the socket through hole and the bolt holding hole faces the socket, and the socket is socketed with respect to the clamp plate surface. A bolt clamping device for a multi-axis nutrunner, comprising: a means for urging in an axial direction.