JPS6232739Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of the pressure reducing valve structure of a multi-spindle pneumatic tightening tool.

Conventionally, as shown in FIG. 1, a large number of nut runners 4 each consisting of an air motor section 1, a reduction gear section 2, and a socket 3 assembled in series are attached to a board 5 at predetermined intervals, and each of the air main pipes 6 is Branch pipe 7,...,
A multi-spindle nut runner is well known in which air is supplied from the nut runners 7 to the air motor sections 1 of each nut runner 4, .

By the way, in the past, only one pressure reducing valve 8 and pressure gauge 9 for adjusting the air pressure were provided in the middle of the main air pipe 6, that is, one for the main air pipe 6. Even though it is displayed, the air pressure actually supplied to the air motor sections 1,..., 1 through each branch pipe 7,..., 7 may vary depending on the difference in piping resistance from the pressure reducing valve to each air motor section, etc. Therefore, it fluctuates individually, and socket 3,
There was a problem that it was difficult to obtain a precise fastening torque due to ..., 3.

This idea was made in view of the above-mentioned conventional problems, and has a configuration in which a pressure reducing valve unit is individually and integrally connected to the air motor section of each pneumatic tightening tool, and the pressure reducing valve unit is installed at a location close to the air motor section. This system is designed to adjust and display air pressure, make the tightening torque of each pneumatic tightening tool accurate, and eliminate variations among the pneumatic tightening tools.

Hereinafter, embodiments of this invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the multi-axis nut runner has each nut runner 4,...
A pressure reducing valve unit 11 which can be adjusted from the outside is detachably connected to the air motor section 1 of the air motor section 4 on the same axis as the air motor section, and the pressure reducing valve unit 11 is branched from the main air pipe 6. Branch pipe 12
is connected to supply air to the air motor section 1 through the pressure reducing valve unit 11, and a pressure gauge 13 that can be observed from the outside is installed on the downstream side of the pressure reducing valve unit 11. An adjustment valve unit 14 is detachably interposed between the air motor section 1 and the air motor section 1.

Pressure reducing valve unit 11 of the nut runner 4
As shown in detail in FIG. 3, an adjusting valve unit 14 is installed at the rear of the air motor section 1.
The valve body 16 is airtightly fastened with a threaded portion 15, and a connection port 17 for connecting the branch pipe 12 is provided on one side of the valve body 16. An air passage 18 reaching the threaded portion 15 side is formed.

In the middle of the air passage 18, at the axial center of the valve body 16, there is a pressure reducing valve 1 that can freely expand and contract the air passage 18.
9 is biased in the diameter expanding direction by a coil spring 20, and the control valve is installed in the hollow part 22 of the case body 16, which communicates with the air passage 18 on the downstream side of the pressure reducing valve 19 via a small hole 21. A diaphragm 24 is provided in contact with the valve shaft 23 of No. 19 from the expanding diameter direction, and a coil spring is installed between the diaphragm 24 and the washer 27 of the adjustment screw 26 screwed into the end of the case body 16 via a cap 25. 28 is compressed, the spring force of the coil spring 28 is changed by adjusting the screw 26, the diaphragm 24 is changed, and the control valve 14 is moved via the valve shaft 23.
Adjustable air pressure can be set by

The pressure reducing valve 19 to which the air pressure is set is connected to the branch pipe 1
Air pressure supplied from 2 to the air passage 18;
It is moved by a diaphragm that changes according to the difference from the set air pressure, and automatically reduces the air pressure in the air passage 18 to the set air pressure.

An adapter 30 having a communication passage 29 communicating with the downstream side of the air passage 18 of the valve body 16 is connected to the other side of the valve body 16.
The pressure gauge 13 is attached to the air pressure gauge 1 so that the air pressure supplied to the air motor section 1 can be directly read.

The adjusting valve unit 14 includes a valve body 32 that is airtightly connected to the rear part of the air motor section 1 by a threaded portion, and the air passage 18 of the pressure reducing valve unit 11 and the air motor section 1 are connected to the valve body 32. A communicating path 33 is formed, and a valve portion 34 having a tapered tip is provided in the middle of the communicating path 33.
An adjusting screw 35 that can be freely taken in and out from the side of the valve body 32 is provided so that the diameter of the communication passage 33 can be expanded or contracted. By operating this adjustment screw 35, the amount of air supplied to the air motor section 1 can be adjusted.

It should be noted that the adjusting valve unit 14 may be removed and the pressure reducing valve unit 11 may be directly connected to the rear part of the air motor section.

Thus, if the structure of the multi-axis nut runner 4 is as described above, the branch pipe 12 is connected from the main air pipe 6 to the branch pipe 12.
After the air supplied to the pressure reducing valve unit 11 via the pressure reducing valve 19 is reduced to a predetermined air pressure, it is supplied to the air motor section 1 via the adjusting valve unit 14, and the air pressure after the pressure reduction is can be directly read using the pressure gauge 13.

Therefore, by adjusting the air pressure with the individual adjusting screws 26, . . . , 26 of each nut runner 4, .
The tightening torque of the socket 3 can be maintained accurately, thereby eliminating variations in the tightening torque between the nut runners 4, . . . , 4.

As is clear from the above explanation, this invention is based on a multi-axis pneumatic tightening tool in which a pressure reducing valve unit with a pressure gauge attached is integrally connected to the air motor of each pneumatic tightening tool. Because of this, the air pressure can be adjusted and displayed for each pneumatic tightening tool when it is close to the air motor, and the tightening torque for each pneumatic tightening tool is accurate. Moreover, variations among the pneumatic tightening tools are also eliminated.

Furthermore, since it can be integrally connected to each pneumatic tightening tool, it can be made smaller and the structure can be simplified, and since it can be attached and detached in the axial direction, maintenance can be easily performed.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a pressure reducing valve structure of a conventional multi-shaft nut runner, Fig. 2 is a side view showing a pressure reducing valve structure of a multi-shaft nut runner according to this invention, and Fig. 3 is a side view showing a pressure reducing valve structure of a multi-shaft nut runner according to this invention. FIG. 3 is a longitudinal cross-sectional view of a pressure reducing valve structure. 1... Air motor section, 2... Reduction gear section, 3
... Socket, 4 ... Nut runner, 5 ... Board, 6 ... Air main pipe, 11 ... Pressure reducing valve unit, 12 ... Branch pipe, 13 ... Pressure gauge, 14
... Adjustment valve unit, 18 ... Air passage, 19 ... Pressure reducing valve, 24 ... Diaphragm, 2
6...adjustment screw, 24...valve section, 35...adjustment screw.

Claims (1)

[Scope of Claim for Utility Model Registration] A large number of pneumatic tightening tools, each consisting of an air motor part, a torque amplification part, and a socket assembled in series, are attached to a board at predetermined intervals, and each pneumatic tightening tool is assembled from each branch pipe of the main air pipe to each pneumatic tightening tool. In a multi-axis pneumatic tightening tool in which air is supplied to each air motor section of the pneumatic tightening tool and the socket is rotated by the drive of the air motor section, the air motor of each of the above pneumatic tightening tools A pressure reducing valve unit, which has approximately the same outer diameter as the air motor part, is capable of adjusting air pressure from the outside, and has a pressure gauge attached adjacent to it, is integrally connected from the axial direction to reduce the pressure. Connect the above branch pipe to the valve unit,
A pressure reducing valve structure for a multi-shaft pneumatic tightening tool characterized by supplying air to an air motor section via a pressure reducing valve unit.