JP2022090691A - Manufacturing apparatus for barrel split body - Google Patents

Abstract

To provide a manufacturing apparatus for barrel split body that can suppress bulging at welding points.SOLUTION: A manufacturing apparatus 1 has a mandrel 20 and a welding block 40. An outer circumferential surface 21 of the mandrel 20 is a holding surface that holds a sheet member 70 so that it becomes cylindrical. The welding block 40 welds two ends 71, 72 of the sheet member 70 along an axial direction of the mandrel 20 by heating and pressurizing them from outer peripheral side.SELECTED DRAWING: Figure 6

Description

The present invention relates to an apparatus for manufacturing a body split body.

Patent Document 1 discloses a hydrogen gas storage tank mounted on an automobile or the like. This hydrogen gas storage tank has a structure in which an inner layer and an outer layer made of fiber reinforced plastic are laminated. The inner layer is produced by molding or the like. The outer layer is made by a known winding method. The outer layer is made by continuously winding a bundle of continuous length fibers over a rotated inner layer.

Japanese Unexamined Patent Publication No. 2008-291944

In a pressure vessel as disclosed in Patent Document 1, there is known a method of combining a body divided body and a dome divided body to manufacture the pressure vessel. As a method for producing the body portion divided body, a method of producing using a sheet member by using the method disclosed in Patent Document 1 can be considered. That is, by winding the sheet member around the mandrel so as to form a cylinder and welding both ends of the sheet member, a tubular body split body can be produced.

However, in the body portion divided body produced in this way, the thickness of the welded portion (both ends of the seat member) is thicker than that of the overlapped portion of the seat member and other portions. Therefore, there is a demand for an apparatus for manufacturing a body split body that can suppress the swelling of the welded portion.

The present invention has been completed based on the above circumstances, and an object of the present invention is to provide an apparatus for manufacturing a body split body capable of suppressing swelling of a welded portion.

The body split body manufacturing apparatus of the present invention is
A manufacturing apparatus for manufacturing the body split body for a pressure vessel, which is formed by combining a body portion split body and a dome portion split body.
A mandrel whose outer peripheral surface is a holding surface that holds the sheet member in a cylindrical shape,
A welding block for welding by heating and pressurizing both ends of the sheet member along the axial direction of the mandrel from the outer peripheral side.
To prepare for.

According to the present invention, the welded portion can be sandwiched between the welded block and the mandrel by pressurizing both ends (welded portions) of the sheet member along the axial direction of the mandrel from the outer peripheral side by the welding block. Then, by heating the welded portion with the welding block, the sheet member can be formed into a tubular member. At this time, since both ends of the sheet member are pressed from the outer peripheral side by the welding block, swelling of the welded portion can be suppressed.

It is a perspective view which shows the pressure vessel of Example 1. FIG. It is a top view which shows the state which the sheet member was wound around a mandrel. FIG. 2 is a cross-sectional view taken along the line AA of FIG. It is a perspective view of a welding block. It is a top view which shows the state in which a welding block is brought into contact with a sheet member wound around a mandrel. FIG. 5 is a cross-sectional view taken along the line BB of FIG. FIG. 5 is a cross-sectional corresponding view taken along the line BB in FIG. 5 in a state where welding of the sheet member is completed. FIG. 5 is a cross-sectional corresponding view taken along the line CC of FIG. 5 in a state where welding of the sheet member is completed. It is sectional drawing which shows the state which completed the welding with the welding block different from the welding block of Example 1 with respect to the sheet member wound around a mandrel.

In the present invention, it is preferable that the region of the holding surface of the mandrel corresponding to the welding block is provided with a heat insulating portion extending along the axial direction of the mandrel. According to this configuration, by interposing the heat insulating portion between the welded portion of the sheet member and the mandrel, it is possible to suppress heat from escaping to the mandrel from the welded portion of the sheet member.

The present invention preferably includes a pair of stoppers that press a portion of the sheet member different from the portion pressurized by the welding block against the mandrel. The pair of stoppers is preferably integrated with the welding block. It is preferable that the pair of stoppers are arranged only on both sides of the welding block in the axial direction of the mandrel. According to this configuration, since the portion of the sheet member that is not welded (the portion that is not heated) is pressed against the mandrel by the pair of stoppers, the portion sandwiched between the stopper and the mandrel does not melt and has a constant thickness (sheet member). Thickness) can be maintained. Since the stopper is integrated with the welding block, the welding block can also be pressed against the sheet member so as to maintain a constant thickness. Further, since the pair of stoppers are arranged only on both sides of the welding block in the axial direction of the mandrel, the diameter of the seat member is larger than that of the configuration in which the seat members are arranged on both sides of the welding block in the circumferential direction of the mandrel. It becomes easier to push inward in the direction. Therefore, it becomes difficult for the seat member to wrinkle.

<Example 1>
Hereinafter, Example 1 embodying the present invention will be described with reference to FIGS. 1 to 9. In the following description, with respect to the vertical direction, the directions appearing in FIGS. 3, 4, 6 to 9 are defined as upward and downward as they are. Regarding the front-back direction, the left and right sides appearing in FIGS. 1, 2, 4, and 5 are defined as front and back. Regarding the left-right direction, the directions appearing in FIGS. 3, 4, 6 to 9 are defined as left and right as they are.

(Manufacturing equipment for split body)
The manufacturing apparatus 1 of this embodiment is an apparatus for manufacturing the body split body 11 of the pressure vessel 10 shown in FIG. The pressure vessel 10 is mounted on a vehicle, for example, and is used as a high-pressure hydrogen gas filling container. The pressure vessel 10 has a cylindrical capsule shape. As an example of the material of the pressure vessel 10, a mixed resin of high-density polyethylene (HDPE) and an ethylene / vinyl alcohol copolymer resin (EVOH) can be used.

The pressure vessel 10 includes a body portion divided body 11 and a pair of dome portion divided bodies 12. The pressure vessel 10 is configured by combining the body portion divided body 11 and the pair of dome portion divided bodies 12.

The body split body 11 has a long cylindrical shape in the axial direction (direction along the axis L1). The inner diameter of the body portion 11 is a constant dimension over the entire length from the front end to the rear end, and the outer diameter dimension is also a constant dimension over the entire length from the front end to the rear end. The dome portion divided body 12 is a hemispherical portion connected to the end portion in the longitudinal direction of the body portion divided body 11. The diameter of the dome portion divided body 12 is reduced as the distance from the body portion divided body 11 increases. A base portion 13 is provided at the top of the dome portion divided body 12.

The manufacturing apparatus 1 includes a mandrel 20 and a heat insulating portion 30 shown in FIGS. 2 and 3, a welding block 40 shown in FIG. 4, and a pair of stoppers 50. As shown in FIGS. 2 and 3, the mandrel 20 is a columnar shape long in the axial direction (direction along the axis L2). The mandrel 20 is made of, for example, a metal material. The outer peripheral surface 21 of the mandrel 20 is a holding surface that holds the seat member 70 in a cylindrical shape. The outer diameter dimension of the outer peripheral surface 21 is a constant dimension over the entire length from the front end to the rear end. The sheet member 70 is a base material of the body split body 11. The sheet member 70 is formed of a material such as a mixed resin of high-density polyethylene (HDPE) and an ethylene / vinyl alcohol copolymer resin (EVOH).

As shown in FIGS. 2 and 3, the mandrel 20 is provided with a groove portion 22. The groove portion 22 is assembled with a heat insulating portion 30 described later. The groove portion 22 is recessed from the outer peripheral surface 21 toward the axis L2.

The heat insulating portion 30 is assembled to the mandrel 20 as shown in FIGS. 2 and 3. The heat insulating portion 30 has a shape close to a rectangular parallelepiped. The upper surface 31 of the heat insulating portion 30 is curved so as to be convex upward. The curvature of the upper surface 31 is the same as that of the outer peripheral surface 21. The heat insulating portion 30 is fitted in the groove portion 22. The heat insulating portion 30 is in close contact with the wall surface of the groove portion 22. The heat insulating portion 30 is provided in a region of the outer peripheral surface 21 of the mandrel 20 corresponding to the welding block 40 described later. As shown in FIG. 6, the heat insulating portion 30 is provided in the mandrel 20 at a position where it overlaps with the welding block 40 described later in the vertical direction. The heat insulating portion 30 is formed of a material having a lower thermal conductivity than that of the mandrel 20 (for example, a ceramic material).

As shown in FIG. 2, the heat insulating portion 30 extends parallel to the axis L2 of the mandrel 20. The heat insulating portion 30 is provided at a central portion in the longitudinal direction of the mandrel 20 (a portion excluding both ends in the longitudinal direction). As shown in FIG. 2, the size of the heat insulating portion 30 in the left-right direction is smaller than the size (diameter size) of the mandrel 20 in the left-right direction. The size of the heat insulating portion 30 in the left-right direction is, for example, about one-third the size of the mandrel 20 in the left-right direction. The upper surface 31 of the heat insulating portion 30 is exposed in a state where the heat insulating portion 30 is assembled to the mandrel 20. The upper surface 31 of the heat insulating portion 30 is flush with the outer peripheral surface 21 of the mandrel 20.

As shown in FIG. 3, in a state where the sheet member 70 is wound around the outer peripheral surface 21 of the mandrel 20, both end portions 71 and 72 along the axis L2 of the sheet member 70 overlap each other in the vertical direction. Both ends 71 and 72 are located above the axis L2 and the heat insulating portion 30. The end portion 71 is in contact with the upper surface 31 of the heat insulating portion 30.

As shown in FIG. 4, the welding block 40 and the pair of stoppers 50 are integrated to form a welding unit 60. The welding block 40 welds the both ends 71 and 72 of the sheet member 70 by heating and pressurizing from the outer peripheral side (the side opposite to the central axis in the radial direction of the mandrel 20). The welding block 40 is heated by, for example, a heater (not shown). The welding block 40 has a shape close to a rectangular parallelepiped extending along the front-rear direction. The size of the welding block 40 in the left-right direction and the front-back direction is about the same as the size of the heat insulating portion 30 in the left-right direction and the front-back direction.

As shown in FIG. 4, the lower surface 41 of the welding block 40 is curved so as to be convex upward. The lower surface 41 is a curved surface having a constant height from the front end to the rear end. The curvature of the lower surface 41 is smaller than the curvature of the outer peripheral surface 21 by the thickness of one sheet member 70. That is, the radius of curvature of the lower surface 41 is larger than the radius of curvature of the outer peripheral surface 21 by the thickness of one sheet member 70.

As shown in FIG. 4, the stoppers 50 are arranged only on both sides (front side and rear side) sandwiching the welding block 40 in the axial direction (front-back direction) of the mandrel 20. The pair of stoppers 50 are connected to the welding block 40 in the front-rear direction. The pair of stoppers 50 presses on the mandrel 20 a portion of the seat member 70 that is different from the portion pressed by the welding block 40. The portion of the sheet member 70 that is different from the portion pressurized by the welding block 40 is a portion adjacent to the portion pressed by the welding block 40 in the front-rear direction (hereinafter referred to as a stopper region 73). The stopper 50 is not heated by a heater or the like, and heat is not transferred from the welding block 40.

Both stoppers 50 have the same shape, as shown in FIG. The lower surface 51 of the stopper 50 is curved so as to be convex upward. The lower surface 51 is a curved surface having a constant height along the front-rear direction. The curvature of the lower surface 51 is smaller than the curvature of the lower surface 41 of the welding block 40. The curvature of the lower surface 51 is smaller than the curvature of the outer peripheral surface 21 by the thickness of two sheet members 70. That is, the radius of curvature of the lower surface 51 is larger than the radius of curvature of the outer peripheral surface 21 by the thickness of the sheet member 70. The size of the stopper 50 in the left-right direction is about the same as the size of the welding block 40 in the left-right direction.

As shown in FIG. 4, a step 45 is provided between the lower surface 41 of the welding block 40 and the lower surface 51 of the stopper 50. The lower surface 41 of the welding block 40 is provided at a position higher than the lower surface 51 of the stopper 50. The height of the step 45 (the vertical distance between the lower surface 41 of the welding block 40 and the lower surface 51 of the stopper 50) is, for example, one sheet thickness of the sheet member 70.

(Manufacturing process of body split body)
Next, a manufacturing process of the body split body 11 using the manufacturing apparatus 1 will be described. First, as shown in FIGS. 2 and 3, the sheet member 70 is wound around the outer peripheral surface 21 of the mandrel 20. Both ends 71 and 72 along the axis L2 of the sheet member 70 are overlapped above the heat insulating portion 30. The seat member 70 has both end portions 71 and 72 extending in parallel with the axis L2. As shown in FIG. 2, both ends of the sheet member 70 in the front-rear direction are arranged so as to protrude outside (both front and rear sides) from the heat insulating portion 30.

Subsequently, as shown in FIG. 5, the welding unit 60 is brought into contact with both ends 71 and 72 of the sheet member 70 from the outer peripheral side (the side opposite to the central axis in the radial direction of the mandrel 20). At this time, the welding block 40 is arranged so as to overlap the heat insulating portion 30 in the vertical direction. As shown in FIG. 6, the welding block 40 is in contact with the end portion 72 of the sheet member 70 in the state before welding. The pair of stoppers 50 do not come into contact with the stopper region 73 and are located above the stopper region 73.

Subsequently, as shown in FIG. 7, the welding block 40 heats and pressurizes a part of the welded portions (hereinafter referred to as welding regions 74) of both ends 71 and 72 of the sheet member 70. By pressurizing the welding region 74 from the outer peripheral side by the welding block 40, the welding region 74 can be sandwiched between the welding block 40 and the mandrel 20 (specifically, the heat insulating portion 30). The welding block 40 presses the welding region 74 from above toward the central axis (axis L2) of the mandrel 20. As a result, both ends 71 and 72 of the sheet member 70 are crushed and welded, and the sheet member 70 becomes cylindrical. Since the heat insulating portion 30 is interposed between the welded region 74 of the sheet member 70 and the mandrel 20, it is possible to suppress heat from escaping from the welded region 74 to the mandrel 20.

At the time of welding the welding region 74, as shown in FIG. 8, the stopper 50 comes into contact with the stopper region 73 and presses the stopper region 73. Since the stopper 50 is not heated by the heater, the stopper region 73 is not welded. Therefore, the stopper 50 does not move further downward in a state of being in contact with the stopper region 73 (more specifically, the end portion 72) (the state shown in FIG. 8). That is, the stopper 50 is in contact with the stopper region 73 while maintaining the thickness of two seat members 70. Further, since the stopper 50 is integrated with the welding block 40, the crushing of the welding region 74 by the welding block 40 can be stopped in the middle. That is, when the height of the step 45 is the thickness of one sheet member 70, the welding region 74 is crushed to the thickness of one sheet member 70 as shown in FIG. 7. This makes it possible to form a cylindrical sheet member 70 having no bulge on the outer peripheral surface.

For example, as a configuration of the welding unit, as shown in FIG. 9, a configuration in which stoppers 250 are provided on both the left and right sides of the welding block 240 can be considered. However, in such a configuration, the stopper 250 exerts a force (see the arrow in FIG. 9) toward the circumferential direction of the mandrel 20 on the seat member 70. Therefore, the portion of the seat member 70 that is pushed by the stopper 250 becomes slippery with respect to the mandrel 20, and the seat member 70 tends to wrinkle. On the other hand, in this embodiment, since the pair of stoppers 50 are arranged in front of and behind the welding block 40, the seat member 70 is moved inward in the radial direction (axis line L2 of the mandrel 20) as compared with the configuration shown in FIG. (Towards) easier to push. Therefore, the seat member 70 is less likely to wrinkle. As described above, the body split body 11 using the sheet member 70 as a base material is manufactured.

(Effect of this example)
Hereinafter, the effect of the first embodiment will be described. According to the manufacturing apparatus 1 of the first embodiment, the welding block 40 pressurizes the welding points (welding region 74) of both ends 71 and 72 of the sheet member 70 along the axial direction of the mandrel 20 from the outer peripheral side. Therefore, both ends 71 and 72 (welding region 74) can be sandwiched between the welding block 40 and the mandrel 20. Then, the sheet member 70 can be formed into a tubular member by heating both ends 71 and 72 (welding region 74) with the welding block 40. At this time, since the welding blocks 40 pressurize both ends 71 and 72 of the sheet member 70 from the outer peripheral side, swelling of the welded portion can be suppressed.

Further, the manufacturing apparatus 1 of the first embodiment includes a heat insulating portion 30 extending along the axial direction of the mandrel 20 in a region of the outer peripheral surface (holding surface) 21 of the mandrel 20 corresponding to the welding block 40. By interposing the heat insulating portion 30 between the welding region 74 of the sheet member 70 and the mandrel 20, it is possible to prevent heat from escaping from the welding region 74 of the sheet member 70 to the mandrel 20.

Further, the manufacturing apparatus 1 of the first embodiment includes a pair of stoppers 50 that press the portion of the seat member 70 different from the portion pressed by the welding block 40 against the mandrel 20. The pair of stoppers 50 are integrated with the welding block 40. The pair of stoppers 50 are arranged only on both sides of the welding block 40 in the axial direction of the mandrel 20. The pair of stoppers 50 presses the unheated portion (stopper region 73) other than the welded portion (welded region 74) of the sheet member 70 against the mandrel 20. Therefore, the portion sandwiched between the stopper 50 and the mandrel 20 can be maintained at a constant thickness (thickness of the sheet member 70) without being crushed and melted. Since the stopper 50 is integrated with the welding block 40, the welding block 40 can also be pressed against the sheet member 70 so as to maintain a constant thickness. Further, a pair of stoppers 50 are arranged only on both sides of the welding block 40 in the axial direction of the mandrel 20. Therefore, the seat member 70 can be easily pushed inward in the radial direction as compared with the configuration in which the welding block 40 is arranged on both sides in the circumferential direction of the mandrel 20. This makes it difficult for the seat member 70 to wrinkle.

<Other Examples>
The present invention is not limited to the examples described in the above description and drawings, and for example, the following examples are also included in the technical scope of the present invention.
(1) In the first embodiment, the welding block 40 moves (moves downward) with respect to the mandrel 20 to press the sheet member 70 against the mandrel 20. However, there may be a configuration in which the mandrel 20 moves (moves upward) with respect to the welding block 40, or a configuration in which the mandrel 20 and the welding block 40 move together.
(2) In the first embodiment, the welding block 40 is in contact with the mandrel 20 from above via the welding region 74, but may be in contact with the mandrel 20 from any other direction. For example, the welding region 74 and the heat insulating portion 30 may be arranged at the lower end of the mandrel 20, and the welding block 40 may be in contact with the mandrel 20 from below via the welding region 74.
(3) In the first embodiment, the size of the welding block 40 in the left-right direction and the front-back direction is about the same as the size of the heat insulating portion 30 in the left-right direction and the front-back direction, but the configuration is not limited to this. For example, the size of the welding block 40 in the left-right direction may be larger than the size of the heat insulating portion 30 in the left-right direction.
(4) In Example 1 above, the mandrel was cylindrical, but it may be cylindrical.
(5) In the first embodiment, the pair of stoppers 50 are provided before and after the welding block 40, but only one of the stoppers 50 may be provided.
(6) In the first embodiment, a heat insulating member may be provided between the welding block 40 and the stopper 50.
(7) In the first embodiment, the pair of stoppers 50 are connected to the welding block 40 in the front-rear direction, but they may be adjacent to each other in the front-rear direction via another member.

1 ... Manufacturing equipment (manufacturing equipment for split body)
10 ... Pressure vessel 11 ... Body division 12 ... Dome division 20 ... Mandrel 21 ... Outer peripheral surface (holding surface)
30 ... Insulation part 40 ... Welding block 50 ... Stopper 60 ... Welding unit 70 ... Sheet members 71, 72 ... Ends 73 ... Stopper area 74 ... Welding area (welding location)

Claims (3)

A manufacturing apparatus for manufacturing the body split body for a pressure vessel, which is formed by combining a body portion split body and a dome portion split body.
A mandrel whose outer peripheral surface is a holding surface that holds the sheet member in a cylindrical shape,
A welding block for welding by heating and pressurizing both ends of the sheet member along the axial direction of the mandrel from the outer peripheral side.
A body split body manufacturing device comprising. The apparatus for manufacturing a body split body according to claim 1, wherein a heat insulating portion extending along the axial direction of the mandrel is provided in a region of the holding surface of the mandrel corresponding to the welding block. A pair of stoppers for pressing a portion of the sheet member different from the portion pressurized by the welding block against the mandrel is provided.
The pair of stoppers is integrated with the welding block.
The apparatus for manufacturing a body split body according to claim 1 or 2, wherein the pair of stoppers are arranged only on both sides of the welding block in the axial direction of the mandrel.

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