JP2016043593A - Welding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To airtightly weld heat-weldable substantially cylindrical materials to each other without heating unevenness.SOLUTION: A welding apparatus 10 comprises a support body 22 slidably erected on a base 12 and a pair of welding heads 48A, 48B oppositely arranged so as to sandwich the outer peripheral surface of an upper end of the support body 22. The support body 22 can be rotated by operation of a lever 20. A cylindrical body 80 is set on the upper end of the support body 22, and an element body 84 for a bag is fitted using a guide member 90. In first welding, while applying current to nichrome plates 56 of the welding heads 48A, 48B so that the amount of the current becomes large, cooling is performed by supplying water inside a tube 52 through the ends of the welding heads 48A, 48B. After the first welding, second welding is performed after switching an electrification path by operating the lever 20 to rotate the support body 22 by about 90° so that the amount of applied current to the nichrome plates 56 becomes smaller than that of the first welding.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a welding apparatus for welding materials that can be welded by heating, and more specifically, to a welding apparatus for substantially cylindrical bodies.

  As a method for manufacturing an inner bag for a marinelli container having a portion in which a sensor of a radioactive substance detector enters, for example, there is a technique described in Patent Document 1 below. According to the technique, a step of molding the bottom into a shape corresponding to the inner bottom structure of the marinelli container using a mold including at least a male mold and a female mold, and a cylindrical body connected to the bottom to the soft polypropylene It consists of a step of forming with resin and a step of heat-sealing the cylindrical body to the bottom and integrally connecting the bottom, and the bottom has shape retention with a resin material in which an olefin resin is mixed with polypropylene resin. It is characterized by being molded as follows.

JP 2013-205057 A

  However, the background art described above does not describe in detail the structure of a heat sealing device for realizing the manufacturing method. Therefore, it is unclear whether the manufactured marinelli container has sufficient airtightness.

  The present invention pays attention to the above points, and provides a welding apparatus capable of welding substantially cylindrical materials that can be welded by heating in an airtight manner without causing uneven heating. Is the purpose.

  The present invention is a welding apparatus for welding a released end portion of a bag body that can be expanded into a substantially cylindrical shape to a released end portion of a substantially cylindrical cylindrical body, and an outer peripheral surface of the cylindrical body is exposed. The cylindrical body is supported on the upper end side and the bag body is mounted along the outer peripheral surface, and the end of the cylindrical body supported by the support means, A welding means for abutting the overlapping portions of the end portions of the bag body mounted on the outer peripheral surface of the support means and welding the ends together, the welding means comprising the support A pair of heads having a substantially arc-shaped heating surface that is capable of advancing and retreating in a direction substantially perpendicular to the axis of the means and abutting along an outer peripheral surface of the support means; and the pair of heads, the support means A drive mechanism for moving forward and backward with respect to the outer peripheral surface of the support, wherein the support means and the pair of heads About the axis of the support means, characterized in that it is relatively rotatable.

  One of the main forms has a base for supporting the support means, and the support means and the pair of heads are relatively supported by rotatably supporting the support means with respect to the base. It is characterized by being rotatable. According to another aspect, there is provided a slide mechanism for moving the support means back and forth in a direction substantially perpendicular to both the axial direction of the support means and the forward and backward directions of the pair of heads. . Still another embodiment is that the length in the circumferential direction of the heating surface of each head of the pair of heads is shorter than 1/2 of the outer periphery of the support means and longer than 1/4 of the outer periphery. Features. Still another embodiment is characterized in that a cooling mechanism for cooling the end portions of each of the pair of heads is provided.

  Still another embodiment is characterized in that a temperature switching mechanism that switches a heating temperature by the heating surface in accordance with a timing of relative rotation between the support means and the pair of heads is provided. Still another embodiment is characterized by comprising guide means that can be attached to and detached from the upper end portion of the support means and guides the mounting of the bag body on the outer peripheral surface of the support means. . Yet another embodiment is characterized in that the bag body in which the cylindrical body and the bag body are welded is an inner bag for a marinelli container attached to the inside of the marinelli container. The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

  According to the present invention, the bag body is supported on the upper end side of the substantially cylindrical support means so that the outer peripheral surface of the substantially cylindrical cylinder is exposed, and is expandable into a substantially cylindrical shape. Is mounted on the outer peripheral surface of the support means. Then, an overlapping portion of the cylindrical body and the bag element mounted on the support means is heated by a substantially arc-shaped heating surface of a pair of heads that can advance and retreat relative to the support means. At that time, the support means and the pair of heads are rotated relative to each other about the axis of the support means. For this reason, after the first heating with the pair of heads, the support means and the pair of heads are relatively rotated and the second heating is performed, whereby the cylinder and the bag body are overlapped. There is an effect that the part can be tightly and evenly adhered.

It is an external appearance perspective view which shows the whole structure of the welding apparatus of Example 1 of this invention. It is the external appearance perspective view which looked at the said FIG. 1 from the arrow F2 direction. 2A and 2B are diagrams illustrating the first embodiment, in which FIG. 1A is a plan view of FIG. 1 viewed from the direction of an arrow F3, and FIG. 2B is an enlarged view of a welding head. It is a figure which shows the effect | action of the said Example 1. FIG. It is a figure which shows the effect | action of the said Example 1. FIG. It is a figure which shows the effect | action of the said Example 1. FIG. It is a figure which shows the effect | action of the said Example 1. FIG.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, Embodiment 1 of the present invention will be described with reference to FIGS. The present invention is an apparatus for welding substantially cylindrical materials that can be heat-welded. In the present embodiment, description will be given by taking as an example the production of an inner bag to be attached to the inside of a marinelli container for measuring a radioactive substance. FIG. 1 is an external perspective view showing the overall configuration of the welding apparatus of the present embodiment. FIG. 2 is an external perspective view of FIG. 1 viewed from the direction of arrow F2. 3A is a plan view of FIG. 1 viewed from the direction of arrow F3, and FIG. 3B is an enlarged view of the welding head. 4-7 is a figure which shows the effect | action of a present Example.

  As shown in FIG. 4 (A), what is welded by the welding apparatus 10 of this embodiment is a cylindrical body 80 and a bag body 84, both of which are formed of a material capable of thermal welding. . The cylindrical body 80 has a substantially cylindrical shape with one end open, and has a bottom portion 80A and a side surface 80B. A substantially cylindrical convex portion 82 having a top surface protruding toward the open end so as to have the same shape as the marinelli container is formed at the center of the bottom portion 80A. By providing such a convex part 82, since it becomes the same shape as the marinade container which is not shown in figure, a clearance gap does not arise when it mounts inside a marinelli container. In addition, the reason why the convex portion is provided at the bottom of the marinelli container is to put a sensor of the detector. The bag body 84 is formed of a sheet or film that can be expanded into a substantially cylindrical shape, and both end portions 84A and 84B are open. As the cylinder 80 and the bag element 84, various known materials that can be welded by heating are used. By welding the open end side of the side surface 80B of the cylindrical body 80 and one end portion (the end portion 84A in the illustrated example) of the bag body 84, an inner bag for a marinade container is formed.

  Next, the structure of the welding apparatus 10 of a present Example is demonstrated. As shown in FIG. 1, the welding apparatus 10 includes a pair of rails 14 </ b> A and 14 </ b> B provided on the upper surface of the base 12, a table 16 that can slide along the rails 14 </ b> A and 14 </ b> B, and a stand 16 on the table 16. A substantially cylindrical support 22 is provided. The rails 14A and 14B extend from the front surface 12A to the back surface 12B of the base 12, and the base 16 can slide along the rails 14A and 14B from the front side to the back side of the welding apparatus 10. Yes. A stopper 15 with which the table 16 abuts is provided on the front surface 12A side of the base 12. A pair of side frames 30A and 30B are arranged on the back surface 12B side of the base 12 so as to sandwich the support body 22, and welding heads 48A and 48B for heating and welding are provided on the upper portions of the side frames 30A and 30B. 48B is provided. Sensors 72A and 72B are provided on the base 12 in the vicinity of the side frames 30A and 30B. Further, a control box 44 for performing various controls described later is provided behind the base 12.

  The support 22 is erected on the table 16 via a disk 18. The disk 18 is rotatable with respect to the table 16 by a bearing or the like (not shown). A lever 20 is provided on the side surface of the disk 18. The lever 20 performs an operation of rotating the support 22 about its axis, and slides the table 16 in the front-rear direction (direction orthogonal to the axis of the support 22) along the rails 14A and 14B. It is for operation. The support 22 is provided with a plurality of holes 24 for heat dissipation on the side surface, and the receiving portion 26 on the upper end side is formed of a heat resistant member. As shown in FIG. 4D, a substantially triangular pyramid-shaped guide member 90 having a tapered surface 92 is detachably attached to the receiving portion 26. The guide member 90 is a guide for facilitating mounting of the bag element 84 on the outer peripheral surface of the support 22.

  Next, the configuration on the side frame 30A side will be described. The side frame 30 </ b> A includes an air cylinder 34 for moving the welding head 48 </ b> A forward and backward with respect to the support 22 on a plate 33 on the top plate 32. A rod 38 that expands and contracts protrudes from the cylinder body 36 of the air cylinder 34, and a slider 40 is fixed to the tip of the rod 38. The slider 40 advances and retreats along the upper surface of the cylinder body 36 as the rod 38 expands and contracts. In this embodiment, the advancing / retreating direction of the slider 40 is a direction substantially orthogonal to both the axial direction of the support 22 and the sliding direction of the support 22 on the base 12. As shown in FIG. 2, tubes 42 </ b> A and 42 </ b> B are connected to the cylinder body 36, and the tubes 42 </ b> A and 42 </ b> B are connected to the control box 44. Then, air is supplied and exhausted through the tubes 42A and 42B by the control box 44, and the rod 38 and the slider 40 are advanced and retracted.

  A substantially rectangular mounting plate 46 is fixed to the upper surface of the slider 40, and a welding head 48 </ b> A is provided on one end side in the longitudinal direction of the mounting plate 46. The welding head 48 </ b> A has a substantially arc-shaped heating surface 50 that can come into contact with the outer peripheral surface of the support 22. The length of the heating surface 50 in the circumferential direction is set to be shorter than 1/2 of the outer periphery of the support 22 and longer than 1/4 (see FIG. 3A). As will be described later, after the first welding is performed with a pair of welding heads 48A and 48B, the support 22 is rotated about 90 ° to perform the second welding, thereby performing the first welding. This is because the welding heads 48 </ b> A and 48 </ b> B overlap the end portions of the above-described portions, so that the cylindrical body 80 and the bag body 84 are welded without a gap.

  On the heating surface 50 of the welding head 48, as shown in FIG. 3B, a nichrome plate 56 is provided as a heat generating plate. The nichrome plate 56 is provided along the heating surface 50, and both end portions 56 </ b> A and 56 </ b> B extend from the ends of the heating surface 50 and are connected to the nichrome wires 58 </ b> A and 58 </ b> B by bolts 60. The nichrome wires 58A and 58B are fixed to the rear of the mounting plate 46 by, for example, a coil spring 62 (see FIG. 2). Clips 64A, 64B, 66A, 66B are attached to the nichrome plate 56 and the nichrome wires 58A, 58B. The clips 64A and 64B are attached near the ends 56A and 56B of the nichrome plate 56, and the other clicks 66A and 66B are attached near the ends of the nichrome wires 58A and 58B. Lead wires 68A, 68B, 70A, 70B are connected to the clips 64A, 64B, 66A, 66B, and these lead wires are connected to the control box 44. The control box 44 can switch between energization via the lead wires 68A and 68B and the clips 64A and 64B and energization via the lead wires 70A and 70B and the clips 66A and 66B.

  As described above, the amount of heat generated on the heating surface 50 varies depending on which of the plurality of clips 64A, 64B, 66A, and 66B is energized. That is, as shown in FIG. 5 (B-1), as shown in FIG. 6 (B-1), the welding heads 48A and 48B are connected to the welding heads 48A and 48B rather than the case where power is supplied from the clips 64A and 64B close to the welding heads 48A and 48B. If the distant clips 66A and 66B are energized, the resistance increases by the length of the nichrome wire 58 between the clips 64A and 64B and the clips 66A and 66B. Then, a smaller current flows than before the length is increased. If the voltage is constant, the power increases as the current increases, and the amount of heat generation is proportional to the power. Therefore, the amount of heat generation decreases as the length of the resistor increases. Utilizing this, at the first welding, by energizing through the lead wires 68A and 68B and the clips 64A and 64B, the length of the resistor is shortened and the heat generation amount is increased. On the other hand, at the time of the second welding, since the support 22 side is already heated and heated, the same amount of heat generation as the first time causes excessive heating. Therefore, energization is performed through the lead wires 70A and 70B and the clips 66A and 66B, thereby increasing the length of the resistor and reducing the amount of heat generation, thereby preventing overheating.

  On the other hand, even if two-stage heating is performed after adjusting the heat generation amount by adjusting the energization position described above, the heating surface 50 is in contact with both the first heating and the second heating (FIG. 6 ( B-1)) tends to increase the temperature. For this reason, in this embodiment, as shown in FIGS. 1 and 2, tubes 52 through which water for cooling is passed are provided at both ends of the heating head 48A. One end of the tube 52 passes through one end of the welding head 48A and is connected to the tube 54A. The other end of the tube 52 penetrates the other end of the welding head 48A and is connected to another tube 54B. By supplying water to the tube 52 from one of the tubes 54A, 54B and draining from the other, only the end of the welding head 48A is compared with the other portions by the water passing through the tubes 54, 54A, 54B. Can be cooled. Water supply and drainage by the tubes 54A and 54B are also controlled by the control box 44. Note that the configuration on the side frame 30A side has been described so far, but the configuration on the side frame 30B side is also symmetrically arranged so that the welding head 48B faces the support 22 side. The configuration is basically the same as that of the side frame 30A.

  Next, the sensors 72A and 72B provided below the side frames 30A and 30B will be described. The sensors 72A and 72B are provided with switches 74A and 74B that come into contact with the lever 20 for rotating and sliding the support 22, and these switches 74A and 74B are connected to the control box 44 by cords 76A and 76B. Has been. When the lever 20 hits the switches 74A and 74B, a detection signal is sent to the control box 44, and the control box 44 controls each part to perform a predetermined operation. The operation of each unit will be described below.

  Next, the operation of this embodiment will be described with reference to FIGS. First, as shown in FIG. 4 (A), the cylindrical body 80 and the bag body 84 are prepared, and as shown in FIG. Pull 12 forward. At this time, the lever 20 is not in contact with any of the switches 74A and 74B. In this embodiment, when the lever 20 is not in contact with the switches 74A and 74B, the welding heads 48A and 48B are separated by the control box 44, and energization to the welding heads 48A and 48B is also stopped. Yes. Next, as shown in FIG. 4 (C), the cylindrical body 80 is placed on the receiving portion 26 on the upper portion of the support 22 so that the opening portion faces downward to expose the outer peripheral surface. Then, as shown in FIG. 4D, the guide member 90 is attached to the upper end of the support 22, and the bag is formed along the tapered surface 92 of the guide member 90 as shown in FIG. The bag element 84 is mounted along the outer peripheral surface of the support 22 from the one end portion 84 </ b> A side of the element body 84. Then, as shown in FIG. 5 (A-2), the edge of the outer peripheral surface of the cylinder 80 and the end 84B side of the bag body 84 overlap each other with a predetermined width.

  Next, as shown in FIG. 5 (A-1), the lever 20 is operated to move the support 22 between the welding heads 48A, 48B of the pair of side frames 30A, 30B (arrow FAa). When completely moved to the back, as shown in FIG. 5 (B-1), the lever 20 is rotated until it contacts either one of the switches 74A and 74B (in the example shown, it contacts the switch 74A side). ) When the contact between the switch 74A and the lever 20 is detected, the control box 44 energizes the nichrome plate 56 through the lead wires 68A and 68B and the clips 64A and 64B, and causes the heating surface 50 of the welding heads 48A and 48B to flow. Heat. At the same time, the control box 44 starts water supply and drainage to the tube 52. Further, the control box 44 drives the air cylinder 34 simultaneously with the start of heating of the welding heads 48A and 48B and cooling of the end portions thereof, and sandwiches the support 22 with the welding heads 48A and 48B. Then, the overlapping portion 86 of the end of the cylindrical body 80 attached to the support 22 and the end of the bag body 84 is heat-welded for the first time by the welding heads 48A and 48B (FIG. 5 ( B-1), (B-2)).

  When a predetermined time has passed as the first heat welding, as shown in FIGS. 6A-1 and 6A-2, when the lever 20 is rotated away from the switch 74A (arrow FBb), the control box 44, the air cylinder 34 is driven in a direction in which the welding heads 48A and 48B are separated from each other. When the lever 20 is further rotated and brought into contact with the switch 74B on the opposite side as shown in FIG. 6 (B-1), the control box 44 is connected to the nichrome via the lead wires 70A and 70B and the clips 66A and 66B. After switching to energize the plate 56, the air cylinder 34 is driven so that the welding heads 48A and 48B sandwich the support 22 (arrow FCa). Then, the welding heads 48A and 48B perform the second welding of the overlapping portion 86 between the end of the cylindrical body 80 attached to the support 22 and the end of the bag body 84 (FIG. 6B). -1), (B-2)).

  At this time, the support 22 itself is heated by the first heat welding. However, by increasing the length of the resistor by increasing the position of the resistor by moving the energization position to the nichrome plate 56, the heat generation amount is reduced to the first time. It becomes smaller than when energizing. For this reason, the heating nonuniformity that the welding part 88B of the 2nd time is heated more than the welding part 88A of the 1st time can be prevented. In this embodiment, the circumferential length of the heating surface 50 of the heating heads 48A and 48B is set to be shorter than ½ of the outer periphery of the support 22 and longer than ¼. Therefore, by rotating the lever 20 by about 90 °, a part of the portion to be heated by the first welding and the second welding is overlapped (see FIG. 6B-1). The overlapping portion 89 is cooled by flowing water through the tube 52 to prevent excessive heating. When a predetermined time elapses as the second welding, as shown in FIGS. 7A-1 and 7A-2, when the lever 20 is rotated away from the switch 74B (arrow FBa), the control is performed. The air cylinder 34 is driven in a direction (arrow FCb) in which the welding heads 48A and 48B are separated by the box 44. Finally, as shown in FIG. 7 (C-1), the support body 22 is pulled out by operating the lever 20, and as shown in FIG. 7 (C-2), the cylindrical body 80 and the bag body 84 are drawn. The inner bag 100 to which is welded is removed from the support 22. In the inner bag 100, an overlapping portion 86 of the cylindrical body 80 and the bag body 84 is sealed by a ring-shaped seal portion 102.

Thus, according to the first embodiment, there are the following effects.
(1) A bag body that supports the cylindrical body 80 on the upper end side of the substantially cylindrical support body 22 and can be expanded into a substantially cylindrical shape so that the outer peripheral surface of the substantially cylindrical cylindrical body 80 is exposed. 84 is mounted on the outer peripheral surface of the support 22. The overlapping portion 86 of the cylinder 80 and the bag body 84 attached to the support 22 can be moved forward and backward with respect to the support 22 and has a pair of welds having a substantially arc-shaped heating surface 50. It is sandwiched between the heads 48A and 48B and heated. At this time, since the support 22 is configured to be rotatable about its axis, after the first welding by the welding heads 48A and 48B, the support 22 is rotated by about 90 ° and then 2 By performing the second welding, there is an effect that the overlapping portion 86 of the cylinder 80 and the bag body 84 can be welded in an airtight manner.

(2) By switching the energizing distance to the nichrome plate 56 for heating the heating surface 50 of the welding heads 48A and 48B, the amount of heat generated at the second welding is smaller than the first welding, Even if the cylindrical body 80 and the bag body 84 are sandwiched between the support body 22 heated by the first welding and the second welding is performed, the heating is not excessive, and the welding can be performed without unevenness.
(3) Since both ends of the welding heads 48A and 48B are cooled by flowing water through the tube 52, they are welded by the welding heads 48A and 48B in both the first welding and the second welding. Excessive heating can be prevented.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) The shapes, dimensions, and materials shown in the above embodiments are examples, and may be changed as appropriate.
(2) In the embodiment described above, the support body 22 and the pair of welding heads 48 </ b> A and 48 </ b> B are relatively centered on the axis of the support body 22 by standing the support body 22 rotatably with respect to the base 16. However, this is also an example, and the welding heads 48A and 48B may be rotated.
(3) In the above embodiment, the support 22 mounted on the table 16 can be pulled out to the front of the base 12, but this is also an example, and the welding heads 48A and 48B may move.

(4) In the above embodiment, the circumferential length of the heating surface 50 of the welding heads 48A and 48B is set to be slightly larger than ¼ of the outer periphery of the support 22, but this is also an example. If the length is shorter than ½ of the outer circumference and longer than ¼, the size can be increased or decreased as necessary.
(5) The control by the control box 44 shown in the above embodiment and the switching timing by the sensors 72A and 72B are also examples, and the design can be changed as appropriate within the range where the same effect can be obtained.
(6) The welding procedure shown in the above embodiment is also an example, and can be changed as appropriate as long as it is within the range where the same effect can be obtained.
(7) In the above embodiment, the inner bag 100 to be attached to the inside of the marinelli container is obtained by welding the cylindrical body 80 and the bag body 84, but this is also an example, and the welding apparatus of the present invention is It can be applied to general welding of substantially cylindrical materials that can be heat-welded.

  According to the present invention, the bag body is supported on the upper end side of the substantially cylindrical support means so that the outer peripheral surface of the substantially cylindrical cylinder is exposed, and is expandable into a substantially cylindrical shape. Is mounted on the outer peripheral surface of the support means. Then, an overlapping portion of the cylindrical body and the bag element mounted on the support means is heated by a substantially arc-shaped heating surface of a pair of heads that can advance and retreat relative to the support means. At that time, the support means and the pair of heads are rotated relative to each other about the axis of the support means. For this reason, after the first heating with the pair of heads, the support means and the pair of heads are relatively rotated and the second heating is performed, whereby the cylinder and the bag body are overlapped. Since the portion can be welded in an airtight manner, it can be applied to a welding apparatus. In particular, it is suitable for the use of a welding apparatus for producing an inner bag for a marinelli container attached to the inside of the marinelli container.

10: welding device 12: base 12A: front surface 12B: back surface 14A, 14B: rail 15: stopper 16: stand 18: disc 20: lever 22: support body 24: hole 26: receiving portion 30A, 30B: side frame 32: Top plate 33: Plate 34: Air cylinder 36: Cylinder body 38: Rod 40: Slider 42A, 42B: Tube 44: Control box 46: Mounting plate 48A, 48B: Welding head 50: Heating surface 52, 54A, 54B: Tube 56 : Nichrome plate 56A, 56B: End portion 58: Nichrome wire 60: Bolt 62: Coil spring 64A, 64B, 66A, 66B: Clip 68A, 68B, 70A, 70B: Lead wire 72A, 72B: Sensor 74A, 74B: Switch 76A, 76B: Code 78: Tube 80: Tube 80A : Bottom portion 80B: Side surface 82: Protruding portion 84: Body for bag 84A, 84B: End portion 86: Overlapping portion 88A, 88B: Welded portion 89: Overlapping portion 90: Guide member 92: Tapered surface 100: Inner bag for marinelli container 102: Seal part

Claims (8)

A welding apparatus for welding the released end of the substantially cylindrical bag body to the released end of the substantially cylindrical cylinder,
A substantially cylindrical support means for supporting the cylindrical body on the upper end side so that the outer peripheral surface of the cylindrical body is exposed, and for mounting the bag element along the outer peripheral surface;
Welding means that abuts the overlapping portion of the end portion of the cylindrical body supported by the supporting means and the end portion of the bag body mounted on the outer peripheral surface of the supporting means, and welds the end portions to each other. When,
With
The welding means includes
A pair of heads having a substantially arcuate heating surface that is capable of advancing and retreating in a direction substantially orthogonal to the axis of the support means and capable of contacting along the outer peripheral surface of the support means;
A drive mechanism for moving the pair of heads forward and backward with respect to the outer peripheral surface of the support means;
Have
The welding apparatus, wherein the support means and the pair of heads are relatively rotatable about an axis of the support means. Having a base for supporting the support means;
By supporting the support means rotatably with respect to the table,
The welding apparatus according to claim 1, wherein the support means and the pair of heads are relatively rotatable. A slide mechanism for moving the support means back and forth in a direction substantially perpendicular to both the axial direction of the support means and the forward and backward directions of the pair of heads;
The welding apparatus according to claim 1, wherein a welding apparatus is provided. The circumferential length of the heating surface of each head of the pair of heads is
The welding apparatus according to any one of claims 1 to 3, wherein the welding device is shorter than ½ of the outer periphery of the support means and longer than ¼ of the outer periphery. A cooling mechanism for cooling an end of each of the pair of heads;
The welding apparatus according to claim 1, wherein the welding apparatus is provided. A temperature switching mechanism for switching the heating temperature by the heating surface according to the timing of relative rotation between the support means and the pair of heads;
The welding apparatus according to claim 1, wherein the welding apparatus is provided. A guide means that is detachable from the upper end of the support means and guides the mounting of the bag body on the outer peripheral surface of the support means;
The welding apparatus according to any one of claims 1 to 6, further comprising:   The bag body in which the cylindrical body and the bag body are welded is an inner bag for a marinelli container that is attached to the inside of the marinelli container. Welding equipment.

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