JP2813765B2 - Valve tightening device for high pressure gas containers - Google Patents

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 containers (hereinafter referred to as "cylinders").
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, to mount the valve, a container holding portion for holding the cylinder body in an upright state, a rotation driving device provided above the container holding portion, and a rotational force transmitted from an output shaft of the rotation driving device. A high-pressure gas container valve tightening device, comprising a wrench attached to the lower end of a transmission shaft to be rotated, and a valve engaged with the wrench being rotated by a rotary drive device and screwed to the cylinder body. It has been.

[0003]

In the above-described conventional tightening device, the valve moves smoothly in the axial direction due to friction between the valve and the spanner as the tightening progresses and the valve moves toward the cylinder body. In some cases, resulting in poor fastening. If such a tightening failure occurs, there is a fear that gas leakage may occur or a valve or cylinder screw may be damaged. Therefore, an object of the present invention is to provide a tightening device in which the above-described tightening failure is unlikely to occur.

[0004]

In order to solve the above problems, the present invention employs the following configuration. That is, the valve tightening device for a high-pressure gas container according to the present invention connects the output shaft of the rotation drive device for rotating the wrench and the transmission member to which the wrench is attached so that it cannot rotate independently and can move axially. It is characterized in that a spring for pressing the transmission member to the output shaft side with a predetermined pressure is interposed.

[0005]

[Function] Since the output shaft of the rotary drive device for rotating the spanner and the transmission member to which the spanner is mounted are connected so that they cannot rotate independently, the torque for tightening is transmitted from the output shaft to the spanner to tighten the valve. Is performed. Also, the valve moves to the cylinder side as the tightening progresses, but since the output shaft and the transmission member are connected so as to be freely movable in the axial direction, even if a frictional force acts between the wrench and the valve, they are spring-loaded. Move in the axial direction together against the force of, and the normal tightening is performed. When the tightening is completed, the spanner returns to the original position by the force of the spring.

[0006]

Embodiments 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 fastening portion 3. The cylinder holding section 2 has a fixing frame 5 erected at one end of a receiving table 4 on which the cylinder is placed, and a reference fixing pad 7 is attached to the fixing frame 5. A support 9 is provided upright at an end of the receiving base 4 opposite to the fixed frame 5. A container fixing air cylinder 10 is provided at a position of the support 9 facing the reference fixing pad.
Is attached, and a V-shaped holding pad 11 is attached to the tip of the piston rod of the cylinder.
In addition, a receiving stand 13 for small containers which can be rotated left and right is provided below the holding pad 11.

[0007] A sprocket support member 15 is fixed to the upper end of the column 9, and a sprocket 17 is attached to this member.
Is rotatably mounted. A linear rail 20 is provided on the front side of the support 9, and a linear bearing 2 attached to a base 22 of the tightening portion 3 is provided on the rail.
3 are engaged so as to be vertically movable. The base 22 is provided with an air motor 25 and a speed reducer 26, which are rotary driving devices, and a torque sensor 27 for detecting a torque of an output shaft of the speed reducer. One end of a chain 29 hung 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 is connected to a connecting 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. The two flange members 40 and 41 are formed in a disk shape having bosses 40a and 41a at the center, and a plurality (eight in the illustrated example) of holes 40b and 41b are formed at positions facing each other along the outer periphery. ing. The torque transmitting bolts 43 are inserted into the holes of these flange members. A nut 44 is screwed into the screw portion 43a of the torque transmission bolt 43,
A coil spring 47 for pressing the flange member 41 upward is interposed between a washer 45 arranged on the upper surface of the nut and the lower surface of the flange member 41.

The boss 41 a of the movable flange 41 is connected to the upper connecting member 50 of the universal joint 33 by a pin 51.
The upper end of an outer cylinder 55 of the transmission member 35 is connected to a lower connecting tool 53 connected to the upper connecting tool 50 by a pin 52 with a pin 56. An inner cylinder 57 is fitted inside the outer cylinder 55 so as to be slidable up and down. And the outer cylinder 55
A spring 60 for lifting the inner cylinder 57 upward is provided between pins 58 and 59 provided on the upper part of the inner cylinder 57 and the lower part of the inner cylinder 57. In the figure, reference numeral 61 denotes a key for regulating the mutual rotation of the outer cylinder 55 and the inner cylinder 57, and reference numeral 65 denotes a bolt for adjusting the vertical position for fixing the inner cylinder 57 to the outer cylinder 55.

A wrench 70 is attached to the lower end of the inner cylinder 57 of the transmission member 35 by a pin 71. The spanner 70 has a concave portion 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 main body by using the tightening device 1, the cylinder main body is first set up on the receiving base 4 of the holding portion 2, and the container fixing air cylinder 10 is extended. The cylinder body is clamped and fixed by the reference fixing pad 7 and the holding pad 11. When the valve V is set on the spanner 70 of the tightening device 3 and the tightening device is lowered until the valve comes into contact with the valve mounting position of the cylinder body, the air motor of the rotary drive device is rotated in the tightening direction. Is screwed to the cylinder body.

As the tightening progresses, the valve descends while being fitted to the spanner. However, 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 cannot move in the axial direction. Since the flexible connecting device is interposed, the wrench 70 is lowered together with the valve against the spring 60 while being engaged with the valve, and continues to transmit the tightening torque. For this reason, sufficient tightening is performed normally. When the tightening of the valve is completed, the torque detected by the torque sensor increases beyond a predetermined range, so that the rotation of the rotary driving device is stopped based on the detection result, and the tightening device 3 is raised. At this time, when the spanner comes off from the valve, the inner cylinder 57 is pulled up by the spring 60. The above operation is performed in the control box 7.
5 is controlled by the control device.

[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 driving device for rotating the spanner and the transmission member to which the spanner is mounted cannot be rotated independently. Since it is connected so that it can move in the axial direction, torque for tightening is transmitted from the output shaft to the spanner to tighten the valve, and even if the valve moves to the cylinder side as the tightening progresses, the spanner and valve engage. As they move, they move together in the axial direction against the force of the spring, and normal tightening is performed . Because of this, the valve
No excessive tightening and pressing forces are applied to
It is possible to perform mounting, and damage to valves and screw parts
Effectively prevent accidents and problems caused by improper tightening.
And it became possible .

[Brief description of the drawings]

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

FIG. 2 is a side view thereof.

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

[Explanation of symbols]

 Reference Signs List 1 valve tightening device 2 cylinder holding portion 3 tightening portion 10 air cylinder 25 air motor 32 connecting device 30 output shaft 32 connecting device 70 spanner

Claims (1)

(57) [Claims] 1. A container holder for holding a high-pressure gas container body in an upright state, a rotation drive device provided above the container holder, and a rotational force transmitted from an output shaft of the rotation drive device. A high-pressure gas container valve tightening device, comprising a wrench attached to the lower end of the transmission member, and rotating the valve engaged with the wrench with a rotary driving device so as to screw into the high-pressure gas container body. The output shaft of the rotary drive device and the transmission member are connected so that they cannot rotate independently and can move in the axial direction, and a spring that presses the transmission member toward the output shaft with a predetermined pressure is interposed. Valve tightening device for high pressure gas containers.