JPH11192589A - Manufacture of end plate for forming end of high pressure container by welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten manufacturing time of end plates by temporarily assembling the member pieces of two units of end plate in a complete full spherical shape on both sides of a rotary supporting beam, attaching a connecting jig on a non-connected weld seam so as to make it a connected state on the entire circumference, and incorporating the member pieces by all-round automatic welding while rotating the rotary supporting beam. SOLUTION: The member pieces 1a, 2a of two units of end plate 1, 2 forming both ends of a high pressure container are temporarily assembled in a complete full spherical shape on both sides of a rotary supporting beam 12 in-between; a connecting jig 3 is attached on a non-connected weld seam (a) to form a connected state on the entire circumference of the weld seam (a), with the member pieces incorporated by all-round automatic welding while the rotary supporting beam 12 is rotated around the center axis c through the center of the full spherical shape; the connecting jig 3 is cut and removed after end of the welding, simultaneously making the two units of nearly semi-spherical end plates 1, 2 which are made by welding on both sides of the rotary supporting beam 12 in-between.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a substantially hemispherical head plate forming an end of a high-pressure vessel by welding, and more particularly, to a method for manufacturing two end plates on both sides of a rotary support girder. Temporarily assemble the head plate pieces into a complete spherical shape, attach the connecting jig on the unconnected welding joint line to make the welding joint line connected all around, and perform full-circle automatic welding while rotating the rotary support girder The parts are integrated by welding, the connecting jig is cut and removed, and two substantially hemispherical end plates are simultaneously manufactured, thereby reducing the manufacturing time of the end plates. The present invention relates to a method of manufacturing a head plate forming an end of a container by welding.

[0002]

2. Description of the Related Art A head plate forming an end portion of a high-pressure vessel is not a perfect hemispherical shape, and has a smaller diameter at a peripheral edge than a perfect hemispherical surface having the same radius of curvature. The substantially hemispherical end plate is manufactured by temporarily attaching a plurality of member pieces, usually four member pieces, to a substantially hemispherical shape, and integrating the respective member pieces by welding. The welding work in the manufacture of the head plate is performed by manual welding by an operator having advanced technology and experience, and is performed exclusively by a specific company.

[0003]

However, since the thickness of the head plate is generally large, it is necessary to repeat the butt welding several tens of times, and it takes a very long time to perform the manual welding operation. However, there is a problem that the length is increased and the manufacturing cost is increased. In addition, since manual welding depends on the skill of the operator, there is also a problem in that the manufacturing time and quality vary. Further, there is a problem that welding defects are easily generated on the welding start point side and the end point side.

Further, as described above, since the end plates are not completely hemispherical, even if the circumferential edges of two end plates having the same shape are joined together and joined together, the end plates do not form a full spherical shape, but are automatically welded. However, it is necessary to set various automatic welding programs in accordance with the size of the head plate, and it is difficult to perform full automatic welding of the head plate.

The present invention has been made in view of the above problems, and has been made in order to solve the problems. It is an object of the present invention to provide two end plate members on both sides of a rotary support girder. Temporarily assemble into a complete spherical shape, attach the connecting jig on the unconnected weld joint line to make the weld joint line all around connected, and use the full circumference automatic welding while rotating the rotating support girder The ends of the high-pressure vessel can be shortened by integrating the pieces by welding, cutting and removing the connecting jig, and simultaneously manufacturing the two substantially hemispherical head plates. It is an object of the present invention to provide a method of manufacturing a head plate forming a portion by welding.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, there are provided two end plate members forming both ends of a high-pressure vessel, with a complete spherical surface on both sides of the rotating support beam. While temporarily assembling into the shape, a pair of connecting jigs having the same welding groove shape as the member piece is attached on the unconnected welding joint line between both sides of the rotating support girder, and the entire welding joint line is In the connected state, the parts are integrated by welding using full-peripheral automatic welding while rotating the rotating support girder about the center axis passing through the center of the full spherical shape, and the welding jig is cut and removed after welding is completed And means for simultaneously manufacturing two substantially hemispherical head plates manufactured by welding on both sides of the rotating support girder.

Here, the welding start point and the end point are set on a connecting jig which is cut and removed after the welding is completed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments of the invention shown in the drawings. Here, FIG. 1 is a schematic side view of a partially cut-out portion, and FIG.
2B is a plan view of the end plate, FIG. 2B is a side view of the end plate, FIG.
FIG. 3C is a partially enlarged cross-sectional view taken along the line AA in FIG.
(A) is a partial front view of a mounting portion of the connecting jig, FIG.
(B) is a sectional view of the connecting jig.

In the drawing, a member piece 1a of the two end plates 1 and a member piece 2a of the end plate 2 are formed by dividing a substantially hemispherical surface having a shorter height from a vertex than a complete hemispherical surface, for example, into four parts. For example, a steel plate having a thickness of several tens of millimeters is formed into a fan shape, and this is formed from a member obtained by bending the steel plate into an arc shape in the thickness direction.

[0010] The member 1a of the end plate 1 and the member 2 of the end plate 2
a is a member piece 1a and a member piece 2a
The thickness side of the plate to be welded is formed into, for example, a shape of a welding groove 4 as shown in FIG. That is, the member pieces 1a on both sides to be welded and joined together or the member pieces 2a,
When two pieces 2a are butted together, they are formed so that the shape of the larger V-shaped welding groove 4 is formed on the outer surface side and the shape of the smaller V-shaped welding groove 4 is formed on the inner surface side. I have.

A pair of connecting jigs 3 is a jig for preventing unconnected state from being generated in a part of the welding joint line a and enabling continuous welding all around. Is mounted at a position on the welding joint line a which passes through a part of a non-connection part which always occurs between two end plates 1 and 2 which are temporarily assembled on both sides thereof.

The pair of connecting jigs 3 are made of two separate steel materials, and the material of the steel materials is the same as the material of the base member 1a of the end plate 1 and the material of the end plate 2a of the end plate 2. The plate thickness is also the same. Further, the joining surfaces of the pair of connecting jigs 3 are the member pieces 1a of the end plate 1 and the member pieces 2a of the end plate 2 described above.
Are formed in the same shape as the welding groove 4 formed in the joint jig 3.
Mounted to match.

The two end plates 1 and 2 may have a cut-out portion b with a circular cutout at the top, if necessary, for connecting pipes and the like. At a position on the welding joint line a passing through the ball portion b, the above-mentioned pair of connecting members are connected so as to prevent a non-joining state from being generated in a part of the welding joint line a and to enable continuous welding all around. The jig 3 is attached.

An automatic welding type end plate manufacturing apparatus 11 is an apparatus which can simultaneously manufacture two end plates 1 and 2 by continuous full-periphery automatic welding, and is a rotary support girder which mounts and supports the two end plates 1 and 2 on both sides. 12, a rotary machine 13 for rotating the rotary support girder 12, two head plates 1, a welding machine 14 for welding the head plate 2, and a control mechanism (not shown) for controlling these.

The rotary support girder 12 is formed, for example, by forming two parallel girders vertically and horizontally into a well shape.
This is a place where the member pieces 1a of the two end plates 1 and the member pieces 2a of the end plate 2 are temporarily assembled into a complete spherical shape and attached to both sides thereof. The member pieces 1a of the two end plates 1 and the member pieces 2a of the end plate 2 before welding are temporarily attached to both sides of the rotary support girder 12 by a piece 5 by partial welding.

The thickness of the rotary support girder 12 is
When the member 1a of the end plate 1 and the member 2a of the end plate 2 are temporarily assembled on both sides of the end plate, the size becomes a complete spherical shape. That is, the sum of the heights of the two end plates 1 and 2 from the vertices and the thickness of the rotary support girder 12 is a diameter of a complete spherical shape.

The rotating machine 13 is a device which holds the both ends of the rotating support girder 12 and continuously rotates the rotating support girder 12 around a horizontal center axis c in a constant vertical direction.
3a, a positioner 13 to which a driving rotary disk 13a is fixed
b, a driven rotating disk 13c, a turning roller 13d that rotatably supports the driven rotating disk 13c, and the like.

The driving rotary disk 13a and the driven rotary disk 13c are arranged so as to face each other with a space therebetween, and the rotary support beam 12 is arranged and held therebetween. That is, one end of the rotary support girder 12 is held by the driving rotary disk 13a, and the other end of the rotary support girder 12 is held by the driven rotary disk 13c.

The driving turntable 13a and the driven turntable 13c rotate around a horizontal axis, and the drive turntable 13a and the driven turntable 13c are arranged so that their rotation centers coincide with each other. Further, the rotary support beam 12 whose both ends are held by the driving rotary disk 13a and the driven rotary disk 13c is provided with a center axis c of the rotation.
Are mounted so as to coincide with the rotation centers of the driving rotary disk 13a and the driven rotary disk 13c. In particular, the rotating support girder 1
2 is mounted such that the center axis of rotation c comes to just one half of its thickness.

The welding machine 14 includes a manipulator 1 that can be moved up and down.
4a, which is attached so as to be able to perform automatic welding all over the circumference in a downward direction. As the welding machine 14, for example, a submerged welding machine is used. Welding machine 1
4. Manipulator 14a and positioner 13b
Are controlled by a control mechanism (not shown).

Next, a method of manufacturing a head plate by welding based on the configuration of the embodiment of the present invention will be described below. A plurality of, for example, four member pieces 1a forming the end plate 1 are combined into a substantially hemispherical shape, and several joint portions are temporarily attached by welding and temporarily assembled. Similarly, a plurality of, for example, four member pieces 2a forming the end plate 2 are combined into a substantially hemispherical shape, and several joint portions are temporarily attached by welding and temporarily assembled.

Further, one end of the rotary support girder 12 which constitutes a part of the automatic welding type end plate manufacturing apparatus 11 is held on the drive rotary disk 13a, and the other end is held on the driven rotary disk 13c. In this case, both ends of the rotary support girder 12 are connected to the drive rotary disk 13a and the driven rotary disk 13c such that the rotation center axis c of the rotary support girder 12 coincides with the rotation centers of the opposing drive rotary disk 13a and the driven rotary disk 13c. It is connected and fixed by a bolt or the like and held.

Using the top 5, the four member pieces 1 a of the end plate 1, which have been temporarily assembled into a substantially hemispherical shape at another place, are used.
It is mounted and supported on the upper side of the rotary support girder 12. Top 5
Is connected to the inside of the member 1a by welding, and similarly connected to the upper side of the rotary support beam 12 by welding.

In this case, the rotation support beam 12 is mounted such that the center axis c of the rotation of the rotation support beam 12 and the center of the end plate 1 temporarily assembled in a substantially hemispherical shape are matched. Further, one of the two welding joint lines a of the four member pieces 1a of the head plate 1 temporarily assembled into a substantially hemispherical shape is attached so as to be orthogonal to the center axis c of rotation of the rotary support girder 12.

Subsequently, the rotation support beam 12 is moved to the center axis c of rotation.
And rotate it 180 degrees around it. Due to this inversion, the four member pieces 1a of the end plate 1 temporarily assembled into the substantially hemispherical shape which has been mounted on the upper side of the rotary support girder 12 are inverted to the lower side, that is, have a lower hemispherical shape. .

The four member pieces 2a of the end plate 2, which has been temporarily assembled into a substantially hemispherical shape at another location, are then applied to the location on the upper side of the rotary support beam 12 due to the reversal in the same procedure as described above. 5 is used to attach and support the upper part of the rotary support girder 12.

In this case, the welding joint line a of the four member pieces 1a of the head plate 1 temporarily assembled into a substantially hemispherical shape attached to the lower side of the rotary support girder 12 and the upper side of the rotary support girder 12 Attachment is performed so that the welding joint line a of the four member pieces 2a of the end plate 2 temporarily assembled into the attached substantially hemispherical shape is the same line.

The four member pieces 1a of the mirror plate 1 and the four member pieces 2a of the mirror plate 2 temporarily assembled into a substantially hemispherical shape attached to the lower side and the upper side of the rotary support girder 12 are combined with the rotary support girder. By adding a thickness of 12, the missing upper and lower vertices have a spherical shape having the same diameter as the shape of the complete spherical surface.

By the way, the four member pieces 2a of the end plate 2 and the end plate 1 mounted on the upper and lower sides of the rotary support
The welding joint line a of the four member pieces 1 a is in a non-connected state by the length of the thickness of the rotary support girder 12. For this reason, 2 of the side orthogonal to the rotation center axis c
A pair of connecting jigs 3 are respectively attached to the non-connecting portions at the locations to establish a connected state so that continuous welding can be performed all around.

The pair of connecting jigs 3 are attached by welding, and the upper ends of the pair of connecting jigs 3 are mounted on the lower surface of the member 2 a of the upper end plate 2, and the lower ends of the pair of connecting jigs 3. This is performed by attaching the side to the upper surface of the member 1a of the lower end plate 1. At this time, the pair of connecting jigs 3 are attached so that the joint surfaces thereof coincide with the welding joint line a.

Further, each of the four member pieces 1a of the mirror plate 1 and the four member pieces 2a of the mirror plate 2 temporarily assembled into a substantially hemispherical shape attached to the lower side and the upper side has a missing ball portion b at each top. In the case of, the pair of connecting jigs 3 is mounted at a position on the welding joint line a passing through the missing ball portion b.

When the above operation is completed, the manipulator 14a
Is moved up and down and back and forth and right and left so that the tip of the torch of the welding machine 14 faces downward, and is attached to the missing ball portion b serving as the top of the four member pieces 2 a of the end plate 2 on the upper side of the rotary support beam 12. The pair of connecting jigs 3 is positioned just above the welding groove 4.

Thereafter, the welding machine 14 is operated to start welding, and at the same time, the positioner 13b is driven to start welding from above the connecting jig 3, and the rotary support girder 12 is rotated around the center axis c of rotation. In this direction, continuous continuous welding is performed at a constant rotation speed of, for example, 30 cm per minute in the direction to continuously rotate the entire circumference.

When the welding thickness reaches a predetermined value, the entire circumference continuous automatic welding is completed when the welding jig 3 returns to the position of the connecting jig 3 where welding has started. Since the welding start point and the welding end point where a welding defect is likely to occur are on the connecting jig 3 to be cut and removed, it is possible to prevent the welding defects from being generated in the two end plates 1 and 2.

When the automatic welding of the entire circumference is completed, the connecting jig 3 connecting the upper end plate 2 of the rotary support beam 12 and the lower end plate 1 on the welding joint line a is cut off and removed. Also, the top 5 on which the end plate 2 is mounted on the upper side of the rotary support girder 12 is removed. Then, the upper end plate 2 is moved to 90
After turning around the vertical axis, the top 5 is mounted again, and the rotated end plate 2 is mounted on the upper side of the rotary support beam 12.

Thereafter, the rotation support beam 12 is moved to the center axis c of rotation.
, The lower end plate 1 is returned to the upper side again, and the top 5 attached to the upper end of the rotary support girder 12 is removed.

Then, the upper end plate 1 is rotated about a vertical axis by 90 degrees, the top 5 is mounted again, and the rotated end plate 1 is mounted on the upper side of the rotation support beam 12, and a pair of connecting jigs 3 is provided. Is attached to a non-joining portion of the welding joint line a orthogonal to the center axis c of rotation, and the whole periphery is automatically welded starting from the top of the connecting jig 3 again. When the position of the connecting jig 3 is returned to the position where the start of the welding, the continuous automatic welding is completed.

As described above, when the welding of the outer surfaces of the end plates 1 and 2 is completed, the inner surface side is welded after the inner surface of the welding connection line a is cleaved. Welding on the inner side is much less than on the outer side. After the inner and outer weldings are completed, the connecting jig 3 and the top 5 are removed, so that the end plate 1 and the end plate 2 are separately taken out from the rotary support girder 12 and the end plate 1 and the end plate 2 are Both sides can be manufactured simultaneously.

It should be noted that the present invention is not limited to the above embodiment of the present invention, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.

[0040]

As is apparent from the above description, according to the manufacturing method of welding the end plates forming the ends of the high-pressure vessel according to the present invention, the two end plate members that are not completely hemispherical are formed. Temporarily assembling a complete spherical surface on both sides of the rotating support girder, and a pair of welding groove shapes similar to the member pieces on a non-joined welding joint line between both sides of the rotating support girder By connecting the welding jig line to the entire circumference connection state by attaching the connection jig and rotating the rotating support girder about the center axis passing through the center of the whole spherical surface, on the equator with a spherical shape with respect to the central axis The turning radius is maintained constant, and the welding joint line of each member and the connecting jig are adjusted on the equator of this spherical surface so that the rotating support girder moves vertically about the horizontal center axis. By turning, the turning radius of the welding joint line is It is possible to rotate the welding joint line in a fixed manner, and furthermore, it is possible to perform downward welding by welding from the top of the entire spherical shape, and it is possible to use full-circle automatic welding. At the same time, the control of the welding machine becomes very simple, and it is not necessary to create a complicated control program.

Furthermore, by setting the welding start point and the end point where welding defects are particularly likely to occur on the connecting jig which is cut and removed after the welding is completed, occurrence of welding defects can be prevented.

In addition, since the entire circumference is continuously welded in the same direction, the time from the previous welding to the next welding at each point of the welding connection line can be all the same, and uniform welding can be achieved. It can be carried out.

In addition, two substantially hemispherical end plates can be simultaneously manufactured on both sides of the rotary support girder, and can be manufactured more efficiently than in the case where they are manufactured separately. The welding quality of the two end plates attached to both ends of the high-pressure vessel can be the same, and the quality of the end plates at both ends of the high-pressure container can be made uniform.

As described above, the working efficiency can be greatly improved as compared with the conventional manual welding, the manufacturing time of the head plate can be greatly reduced, and the manufacturing cost can be reduced. It is possible to eliminate the need for skilled welding workers and to manufacture a head plate of uniform quality without welding defects.
It has a very novel and beneficial effect.

[Brief description of the drawings]

FIG. 1 is a schematic side view, partially cut away, showing an embodiment of the present invention.

FIG. 2A is a plan view of a head plate showing an embodiment of the present invention. (B) is a side view of the head plate showing the embodiment of the present invention. FIG. 2C is a partially enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3A is a partial front view of a mounting portion of a connecting jig showing the embodiment of the present invention. (B) is a sectional view of the connecting jig showing the embodiment of the present invention.

FIG. 4 is a side view of the high-pressure container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 End plate 1a Member piece 2 End plate 2a Member piece 3 Connecting jig 4 Welding groove 5 frames 11 Automatic welding type end plate manufacturing device 12 Rotation support girder 13 Rotary machine 13a Driving turntable 13b Positioner 13c Followed turntable 13d Turning roller 14 Welding machine 14a Manipulator a Welding joint line b Missing ball part c Center axis of rotation

Claims (2)

[Claims] 1. A method for temporarily assembling two end plate members forming both ends of a high-pressure vessel into a complete spherical shape on both sides of a rotating support girder, and at the both sides of the rotating support girder. Attach a pair of connecting jigs having the same welding groove shape as the member pieces on the unconnected welding joint line to make the welding joint line a full-circle connection state, and center the rotary support girder through the center of the full spherical shape The parts are integrated by welding using full-periphery automatic welding while rotating around the axis, and after the welding is completed, the connecting jig is cut and removed. A method of manufacturing a head plate forming an end portion of a high-pressure vessel by welding two head plates having a hemispherical shape at the same time. 2. The manufacturing method according to claim 1, wherein the welding start point and the end point are set on a connecting jig which is cut and removed after the welding is completed.