JPH05332500A - Valve fastening device for high pressure gas container - Google Patents

Abstract

PURPOSE:To provide a valve tightening device which is suitably used for the work in installing a valve which is demounted from a container again in the inspection process, etc., for a high pressure gas container. CONSTITUTION:A valve fastening device for a high pressure gas container is equipped with a container holding part for holding a high pressure gas container body in erection state, revolution driving device installed above the container holding part, and a spanner 70 installed at the lower edge part of a transmission member 35 to which a turning moment is transmitted from the output shaft 30 of the revolution driving device, and the valve engaged with the spanner 70 is screwingly fitted on the high pressure gas container body by the revolution of the revolution drive device. The output shaft 30 of the revolution drive device and the transmission member are connected in independent revolution disabled form and in shiftable manner in the axial direction, and a spring for pressing the transmission member by a prescribed pressure to the output shaft side is interposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve tightening device used for mounting a valve on a high pressure gas container body.

[0002]

2. Description of the Related Art High-pressure gas container (hereinafter referred to as "cylinder")
In the inspection process, the valve is once removed from the cylinder, the inside is cleaned, various inspections and necessary processing are performed, and then the valve is attached again. Conventionally, for mounting this valve, a container holding part for holding the cylinder main body in an upright state, a rotation drive device provided above the container holding part, and a rotational force transmitted from an output shaft of the rotation drive device. A valve tightening device for a high-pressure gas container, comprising a spanner attached to a lower end of a transmission shaft, and a valve engaged with the spanner being rotated by a rotary drive device to be screwed to a cylinder body. It has been.

[0003]

In the conventional tightening device described above, the valve moves smoothly in the axial direction due to the friction between the valve and the wrench in the process in which the valve moves toward the cylinder body side as the tightening progresses. In some cases, it could not be tightened, resulting in poor tightening. If such improper tightening occurs, there is a risk of gas leakage or damage to the valve or cylinder screw. Therefore, it is an object of the present invention to provide a tightening device in which the above tightening failure does not easily occur.

[0004]

In order to solve the above problems, the present invention adopts the following constitution. That is, the valve tightening device for a high-pressure gas container according to the present invention, while connecting the output shaft of the rotary drive device for spanner rotation and the transmission member to which the spanner is attached so as not to be independently rotatable and axially movable, A feature is that a spring that presses the transmission member toward the output shaft with a predetermined pressure is interposed.

[0005]

Since the output shaft of the rotary drive for rotating the wrench and the transmission member to which the wrench is attached are connected so that they cannot rotate independently, the tightening torque is transmitted from the output shaft to the wrench and the valve is tightened. Is done. Although the valve moves to the cylinder side with the progress of tightening, the output shaft and the transmission member are connected so as to be movable in the axial direction, so that even if a frictional force acts between the spanner and the valve, both springs. Along with the force of, it moves axially together and normal tightening is performed. When the tightening is completed, the wrench returns to the original position by the force of the spring.

[0006]

EXAMPLES Examples of the present invention will be described below. 1 and 2 show an example of a valve tightening device for a high-pressure gas container according to the present invention. The valve tightening device 1 includes a cylinder holding portion 2 for holding a cylinder in an upright state.
And a tightening portion 3. In the cylinder holding portion 2, a fixed frame 5 is erected on one end of a cradle 4 on which the cylinder is placed, and a reference fixed pad 7 is attached to this. Further, a column 9 is erected at the end of the receiving table 4 opposite to the fixed frame 5. An air cylinder 10 for fixing the container is provided at a position of the column 9 facing the reference fixing pad.
Is attached, and a V-shaped pressing pad 11 in plan view is attached to the tip end portion of the piston rod of the cylinder.
Below the pressing pad 11, there is provided a small container support 13 that can be rotated left and right.

A sprocket support member 15 is fixed to the upper end of the column 9, and the sprocket 17 is attached to this member.
Is rotatably attached. Further, a linear rail 20 is provided on the front side of the column 9, and the linear bearing 2 attached to the base 22 of the tightening portion 3 is attached to this rail.
3 is vertically movably engaged. An air motor 25, which is a rotary drive device, a speed reducer 26, and a torque sensor 27 for detecting the torque of the output shaft of the speed reducer are attached to the base 22. One end of a chain 29 hooked on the sprocket 17 is fixed to the upper end of the air motor 25. The other end of the chain 29 is connected to a lifting device having an air motor (not shown).

The output shaft 30 of the speed reducer 26 has a coupling device 32.
And a transmission member 35 via a universal joint 33. The coupling device 32 includes a fixed flange member 40 fixed to the output shaft 30 of the speed reducer, and a movable flange member 41 overlapping the fixed flange member 40. Both flange members 40 and 41 are formed in a disk shape having bosses 40a and 41a in the center, and a plurality of holes (8 in the illustrated example) 40b and 41b are formed at positions facing each other along the outer periphery thereof. ing. The torque transmission bolts 43, ... Are inserted into the holes of both flange members. A nut 44 is screwed onto the threaded portion 43a of the torque transmission bolt 43,
A coil spring 47 for pressing the flange member 41 upward is interposed between the washer 45 arranged on the upper surface of the nut and the lower surface of the flange member 41.

The boss 41a of the movable flange 41 is connected to the upper connector 50 of the universal joint 33 by a pin 51.
The upper end of the outer cylinder 55 of the transmission member 35 is connected by a pin 56 to the lower connector 53 which is connected to the upper connector 50 by a pin 52. An inner cylinder 57 is fitted inside the outer cylinder 55 so as to be vertically slidable. And the outer cylinder 55
A spring 60 that lifts the inner cylinder 57 upward is provided between the upper part of the inner cylinder 57 and the pins 58 and 59 provided on the lower part of the inner cylinder 57. In the figure, 61 is a key for restricting mutual rotation of the outer cylinder 55 and the inner cylinder 57, and 65 is a vertical position adjusting bolt for fixing the inner cylinder 57 to the outer cylinder 55.

A spanner 70 is attached to the lower end of the inner cylinder 57 of the transmission member 35 by a pin 71. The wrench 70 includes a recess 72 into which the valve V of the cylinder B is fitted,
The valve fitted in the recess is rotated in a predetermined direction.

When the valve V of the cylinder B is screwed to the cylinder body by using the tightening device 1, first, the cylinder body is erected on the receiving base 4 of the holding portion 2 and the container fixing air cylinder 10 is extended. Then, the cylinder main body is clamped and fixed by the reference fixing pad 7 and the pressing pad 11. When the valve V is set in the wrench 70 of the tightening device 3, the tightening device is lowered until the valve is placed at the valve mounting position of the cylinder body, and the air motor of the rotary drive device is rotated in the tightening direction. Is screwed onto the cylinder body.

[0012] As the tightening progresses, the valve descends while being fitted to the spanner, but this tightening device cannot rotate between the output shaft of the rotary drive device and the transmission shaft to which the spanner is attached, and moves in the axial direction. Since the flexible connecting device is interposed, the spanner 70 also moves downward against the spring 60 while engaging with the valve, against the spring 60, and continues to transmit the tightening torque. Therefore, sufficient tightening is normally performed. When the tightening of the valve is completed, the torque detected by the torque sensor increases beyond a predetermined range, so that the rotation drive device stops rotating based on the detection result, and the tightening device 3 rises. At this time, when the spanner is removed from the valve, the inner cylinder 57 is pulled up by the spring 60. In addition, the above operation is the control box 7
It is controlled by the controller in 5.

[0013]

As described above, in the valve tightening device for a high pressure gas container according to the present invention, the output shaft of the rotary drive device for rotating the spanner and the transmission member to which the spanner is attached cannot rotate independently. Since it is connected so that it can move axially, the torque for tightening is transmitted from the output shaft to the spanner to tighten the valve, and the spanner and valve engage even if the valve moves to the cylinder side as the tightening progresses. As it is, it moves in the axial direction together with the force of the spring and the normal tightening is performed, so that it is possible to effectively prevent the problem due to poor tightening.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view thereof.

FIG. 3 is a sectional view of the main part.

[Explanation of symbols]

 1 Valve Tightening Device 2 Cylinder Holding Part 3 Tightening Part 10 Air Cylinder 25 Air Motor 32 Coupling Device 30 Output Shaft 32 Coupling Device 70 Spanner

Claims (1)

[Claims] 1. A container holder for holding a high-pressure gas container main body in an upright state, a rotary drive device provided above the container holder, and a rotational force transmitted from an output shaft of the rotary drive device. A valve tightening device for a high-pressure gas container, comprising a spanner attached to a lower end portion of a transmission member, wherein a valve engaged with the spanner is rotated by a rotary drive device to be screwed to a high-pressure gas container body. An output shaft of the rotation drive device and a transmission member are connected to each other such that they cannot rotate independently and are movable in the axial direction, and a spring that presses the transmission member toward the output shaft side with a predetermined pressure is interposed. Valve tightening device for high pressure gas containers.