JPS6018295Y2 - Natsutranna reaction force receiver - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reaction force receiver for a nut runner used when tightening bolts and nuts.

Generally, on the output side of the nut runner, as shown in FIG. 1 and FIG. 2, which is a view of FIG.
Attach the socket 3 to the tip of the output shaft 2 of the
- 3, a reaction force receiver 7 is attached to a square or hexagonal attachment portion 5 provided at the lower end of the lower bracket 4 of the nut runner 1 with an attachment screw 6.

The reaction force receiver 7 is provided at its upper end and has a mounting hole 8 that fits into the mounting portion 5 and a hollow portion 9 that communicates with the mounting hole 8 and is provided so as to cover the socket 3. The force receiving cylinder 10 and the reaction force receiving claw 11 attached to the lower part of the outer peripheral surface of the reaction force receiving cylinder 10 are used to connect the center of the mounting hole 8 and the hollow part 9.
The centers of are arranged concentrically.

When tightening a bolt or nut using the nut runner 1 with this reaction force receiver 7 attached, first fit the socket 3 to the bolt or nut to be tightened, and then insert the reaction force receiver claw 11 of the reaction force receiver 7 into the adjacent bolt or nut that has already been tightened. The nut runner 1 is actuated by contacting a fixed object such as the head of a bolt or a put, and the reaction force of bolt/nut tightening is received by the fixed object via the reaction force receiving pawl 11 of the reaction force receiver 7. .

The following will explain the case of tightening right-handed bolts and nuts as an example.

In this case, since the socket 1-3 is fitted with the bolt/nut to be tightened, the socket 3 is hardly tilted due to the play in the fitting portion of the output shaft 2.

However, the tip of the reaction force receiving body 10 of the reaction force receiver 7 is not restrained, and the reaction force receiving body 10 of the reaction force receiver 7 fitted therewith is connected to the mounting part 5 of the lower bracket 4 of the oak 1''/runner 1. Reaction force receiving body 10
The mounting portions 8 of the reaction force receiver 7 are concentric and there is a play between them, so the reaction force acting on the reaction force receiving claw 11 in the direction shown by the arrow 12 in FIG. The barrel 10 is tilted, and the outer surface of the rotating socket 3 and the inner surface of the reaction force receiving barrel 10 interfere at point B, resulting in galling, and the load on the prime mover of the nut runner 1 increases rapidly.

Generally, the prime mover of the nut runner 1 is controlled by its load, such as air pressure, oil pressure, or electric current, so this sudden increase in load apparently corresponds to the predetermined tightening torque or axial force of the bolt to be tightened. When the load is reached,
The prime mover of the nut runner 1 stops even though the bolt is not tightened to a predetermined tightening torque or axial force.

Therefore, the worker may misunderstand that the bolts have been tightened with the specified tightening torque or axial force, and continue tightening the bolts and nuts, and after completing the tightening of all the bolts and nuts,
If it is discovered during bolt axial force inspection that the tightened bolt has not reached the specified axial force, all Pol I
- The nut had to be retightened, which had the disadvantage of greatly reducing work efficiency.

Further, when an electric motor is used as the prime mover of the nut runner 1, there is a drawback that the galling described above overloads the electric motor and may cause the electric motor to burn out.

The present invention was made to eliminate the above-mentioned drawbacks. Even if the reaction force receiving body of the reaction force receiver is tilted due to reaction force during bolt/nut tightening work, it will not react with the rotating outer surface of the socket. To provide a reaction force receiver for a nut runner that does not cause galling due to interference of the inner surface of a force receiver cylinder.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 4 is a front view of a nut runner according to an embodiment of the present invention in which a reaction force receiver is attached to the output shaft of the nut runner.

In FIGS. 1 to 4, the same numbers indicate the same members.

In FIG. 4, the reaction force receiver 7' of the nut runner has a mounting hole 8' that fits into the mounting part 5 provided at the lower end of the lower bracket 4 of the nut runner 1, and a mounting hole 8' that fits into the mounting part 5 provided at the lower end of the lower bracket 4 of the nut runner 1. A reaction force receiving barrel 10' having a hollow portion 9' that communicates with the mounting hole 8' and a reaction force receiving claw 11 attached to the lower part of the outer peripheral surface of this reaction force receiving barrel 10' are attached to the center of the mounting hole 8'. line 13
The center line 14 of the cavity 9' is inclined toward the reaction force receiving claw side by a predetermined angle α, so that the outer surface of the socket 3 and the reaction force receiving claw 7'
When tightening bolts and nuts with the nut runner 1 by increasing the clearance between the reaction force receiving cylinder 10' and the reaction force receiving cylinder 10' of the nut runner 1 and the reaction force receiving cylinder 10' of the mounting part 5 of the nut runner 1 and the reaction force receiving cylinder 7'.
The clearance between the mounting holes 8' prevents the outer surface of the rotating socket 3 from interfering with the inner surface of the reaction force receiving barrel 10' of the reaction force receiver 7'.

Therefore, as shown in FIG. 4, this reaction force receiver 7' is attached to the attachment part 5 at the lower end of the lower bracket 4 of the nut runner 1 with the attachment screw 6, and the socket 3 is fitted into the bolt/nut to be tightened. When the reaction force receiving claw 11 of the reaction force receiver 7' is brought into contact with an adjacent fixed object and the nut runner 1 is operated, a reaction force is applied to the reaction force receiving claw 11 of the reaction force receiver 7' in the direction of the arrow 12. Due to the play between the mounting part 5 of the working waist nut runner 1 and the mounting hole 8' of the reaction force receiving body 10' of the reaction force receiving body 7', the reaction force receiving body 10' is tilted [7], as described above. The hollow portion 9
Since the center line 14 of ' is inclined by a predetermined angle α,
The outer surface of the rotating socket 3 and the inner surface of the reaction force receiving barrel 10' do not interfere and cause galling.

When tightening left-handed bolts and nuts, use the reaction force receiver 7.
' and the inclination angle α of the center line 14 of the cavity 9' with respect to the center line 13 of the mounting hole 8' of the reaction force receiving barrel 10'.
It is only necessary to convert the angle to be symmetrical with respect to the center line 13 of the mounting hole 8'.

As described above, the reaction force of the nut runner of the present invention is such that the center line of the reaction force receiving body is inclined by a predetermined angle α toward the reaction force receiving claw side with respect to the center line of the mounting hole of the reaction force receiving body of the reaction force receiver. When the force receiver is attached to the nut runner and the bolts and nuts are tightened, the reaction force is generated by the reaction force and the play between the lower end of the nut runner lower bracket and the mounting hole in the reaction force receiver body of the reaction force receiver. Even if the reaction force receiving cylinder of the receiver is tilted, the outer surface of the rotating socket and the inner surface of the reaction force receiving cylinder will not interfere and cause galling.

Therefore, the load on the nut runner's prime mover increases rapidly due to galling, and the nut runner's prime mover stops before the tightening torque or axial force of the bolt to be tightened reaches the predetermined tightening torque or axial force. There is no need to retighten bolts and nuts due to the insufficient axial force of the bolts, which significantly improves work efficiency.Also, even if an electric motor is used as the prime mover, galling can overload the electric motor and cause it to burn out. It has great effects such as eliminating fear.

[Brief explanation of the drawing]

Figure 1 is a front view of the main parts of a conventional reaction force receiver attached to a nut runner, Figure 2 is a view taken in the direction of arrow A in Figure 1, and Figure 3 shows a conventional reaction force receiver attached to the nut runner with free play. FIG. 4 is a front view showing an inclined state due to a gap, and FIG. 4 is a front view of an embodiment of the present invention. 7'...Reaction force receiver, 8'...Mounting hole, 9
'...Cavity part, 10'...Reaction force receiving body,
11...Reaction force receiving claw.

Claims (1)

[Scope of utility model registration request] - Has a mounting hole at the upper end that fits into the mounting part provided at the lower end of the lower bracket of the runner, and communicates with the mounting hole to tighten the bolt and nut attached to the lower end of the output shaft of the nut runner. In the reaction force receiver for a nut runner, the reaction force receiver includes a reaction force receiver having a hollow portion provided to cover a socket for attachment, and a reaction force claw attached to a lower part of the outer peripheral surface of the reaction force receiver, A reaction force receiver for a nut runner, characterized in that a vertical center line of the hollow portion is inclined at a predetermined angle toward the reaction force receiving claw with respect to a vertical center line of a mounting hole.