JPH0324284Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is useful when welding is performed to improve airtightness and mechanical strength at openings for introducing and removing raw materials and products, such as in high-temperature reaction vessels. The present invention relates to a preferred welding structure of a joint portion of a cylindrical body.

[Prior Art] In the so-called Kroll method in which titanium tetrachloride is reduced with metallic magnesium to obtain spongy metallic titanium, the above reaction is carried out while heating a reduction reaction vessel in an electric furnace, and after the reaction is completed, the reaction vessel is is connected to a vacuum distillation apparatus, and vacuum distillation is performed while the reaction vessel is further heated to a high temperature to remove metallic magnesium and magnesium chloride remaining in the titanium sponge, thereby purifying titanium sponge. The produced titanium sponge is taken out from an outlet 3 formed in the bottom 2 of the reaction vessel 1, as shown in FIG. This outlet 3 has a welded structure to improve airtightness and strength. That is, it is composed of a cylindrical part 4 which is inserted through an opening 2a formed in the bottom part 2 and fixed by welding, and a bottomed cylindrical lid 5 joined to the lower end of this cylindrical part 4. 5 and the cylindrical part 4 have a V at their joints.
A letter-shaped or Y-shaped groove is formed, and after this groove is welded, a cylindrical reinforcing tube 7 is fitted onto the outer surface of the welded portion 6 and fixed by welding. Therefore, when taking out titanium sponge, the welds 8 and 8' between the reinforcing cylinder 7 and the outer surface of the cylindrical part 4 or the lid 5, and the butt weld 6 between the cylindrical part 4 and the lid 5 are removed. Remove the welded metal at , cut off these welded parts 8, 8', and 6 to open the outlet 3, and in order to restart the operation, repeat the above process in reverse and open the outlet 3 again. The process is to close it down.

Further, as another method, there is a sealing structure by welding a lip seal as shown in FIG. This has flanges 31 and 32 formed at the abutting portions of the cylindrical portion 4 and the lid 5, respectively, and ring-shaped lip plates 33 and 3 having the same diameter on opposing surfaces of the flanges 31 and 32.
4 is welded and fixed, and the lip plates 33 and 34 are fixed by welding.
Weld metal 35 is heaped up and welded to the outer end of the tube to seal it.

[Problems to be solved by the invention] However, in the welding structure of the joint as shown in FIG. The amount is large, and the orientation of the welded parts is poor, making workability difficult, making setup work time-consuming. In addition, such opening and closing operations are repeated every time titanium sponge is manufactured in batches, but due to the large amount of heat input during welding, the cylindrical portion 4 repeatedly expands and contracts, causing a cooling process after welding. As a result, the diameter of the welded portion progresses to shrink, which may impede the work of taking out the titanium sponge, or the welded portion 9 between the bottom portion 2 of the reaction vessel 1 and the cylindrical portion 4 due to the stress caused by the expansion and contraction. There was a problem that cracks were formed.

Furthermore, in the welded structure shown in FIG. 5, it is difficult to build up the weld metal 35 and weld it.
It is difficult to remove only the lip plate 3.
3 and 34 become smaller each time, and it becomes necessary to update the lip plates 33 and 34 several times. Further, such a structure has a problem in that the strength is insufficient to support the weight of the lid 5.

[Means for Solving the Problems] In order to solve the above-mentioned problems, this invention proposes a method for joining cylindrical bodies in which the end surfaces of metal cylindrical bodies are brought into contact with each other and joined by airtight welding. In the welded structure of the section, plate-shaped intermediary members with different outer diameters are welded to the end surfaces of the cylindrical body, and these intermediary members are joined together by welding, thereby ensuring airtightness. A flange is provided at each lower end of the body, and the end faces of the flange are welded via a mediating member, and a reinforcing member that clamps the outer edge of the flange improves the joint strength.

[Function] In such a welded structure of a joint of a cylindrical body, plate-shaped intermediary members having different outer diameters are welded and fixed to each end face of the cylindrical body, and the intermediary members are welded and joined together. (Especially if the lower intermediary member is made larger and fillet welded between the outer peripheral surface of the upper intermediary member and the upper surface of the lower intermediary member), the direction and shape of the welded part will be better, and the welding will be easier. And it is easy to remove welded metal. Further, the amount of welded metal is small, the amount of heat input is small, the welded part and the cylindrical body are spaced apart, and the thermal strain applied to the cylindrical body itself is minute.

Further, only the weld metal at the fillet weld can be removed without removing any additional mediating member.

[Embodiment] An embodiment of this invention will be described below with reference to FIGS. 1 and 2. Note that the same parts as in the conventional example have the same reference numerals.

The reaction vessel 1 is a titanium reduction vessel used in the Kroll method as it is, but the attached equipment for reduction treatment and the upper part equipped with a sealing lid are not shown. A cylindrical part (upper cylindrical body) 12 having an upper flange 11 formed at its lower end is inserted through the opening 2a of the bottom 2 of the reaction vessel 1, and the inner and outer surfaces of the bottom 2 and the cylindrical part 12 are connected to each other. A welded portion 9 is formed by fillet welding at the intersection with the outer surface. A hollow disk-shaped upper intermediate member 13 is joined to the bottom surface 11a of the upper flange 11 (ie, the end surface of the cylindrical portion 12). That is, the inner diameter and outer diameter of the upper intermediate member 13 are larger than the inner diameter and outer diameter of the upper flange 11, respectively, and fillet welding is performed on the outer circumferential surface of the upper flange 11 and the inner circumferential surface of the upper intermediate member 13 to form the welded portions 14, 14. is formed. On the other hand, a lower flange 16 is formed at the upper end of the lid (lower cylindrical body) 15, and a lower intermediate member 17 is fixed to the upper surface (end surface of the lid 15) 16a of the lower flange 16 by a welded portion 18. There is. The outer diameter of the lower intermediary member 17 is larger than that of the upper intermediary member 13, and the upper surface of the lower intermediary member 17 and the outer peripheral surface of the upper intermediary member 13 are fillet welded to form a welded portion 19, thereby forming the intermediary member. 13 and 17 are joined together. The outer edges of these upper and lower flanges 11 and 16 are clamped and reinforced by reinforcing members 20. This reinforcing member 20 is composed of annular pieces 21 whose entire circle is roughly divided into three parts, and on the inner surface of each annular piece 21, a clamping member is formed to expand inwardly so as to clamp the outer edges of the flanges 11 and 16. A groove 22 is formed, and a joint piece 24 in which bolt holes 23 are formed is formed at the end of the annular piece 21. And the clamping groove 22
Connecting piece 24 with flanges 11 and 16 sandwiched between them.
They are connected with bolts 25, and the flanges 11, 1
It is designed to reinforce the clasp of 6. Note that the length of the annular piece 21 in the circumferential direction is the same as that of the flanges 11 and 16.
It is set so that when the ring-shaped pieces 21 are clamped together, there will be some gap between them and the adjacent annular pieces 21.

Next, the operation of the welded structure of the joint of the cylindrical body constructed as described above will be described.

The titanium sponge produced by reducing titanium tetrachloride in the reaction vessel 1 is further subjected to vacuum distillation treatment to remove impurities and then taken out. In this case, a stand (not shown) may be placed under the lid 15.
support the load, remove the bolts 25... and connect the joint piece 24
The reinforcing member 20 is separated into annular pieces 21. Then, the welded metal at the welded portion 19 between the upper and lower intermediate members 13 and 17 is melted and removed, the intermediate members 13 and 17 are uncoupled, and the lid 15 is removed from the lower end of the cylindrical portion 12. When attaching the lid 15 to the cylindrical portion 12 in order to carry out a new batch-type process, the above steps may be performed in reverse. That is, the lid 15 is placed on a stand, and the upper and lower flanges 11, 16 are
The welded portion 19 is formed by fillet welding between the outer peripheral surface of the upper intermediate member 13 and the upper surface of the lower intermediate member 17. Furthermore, while keeping the annular piece 21 in that state, the fitting groove 22 of the annular piece 21 is inserted into the flanges 11 and 16.
The connecting pieces 24 are connected to each other by bolts 25, and the flanges 11 and 16 are tightened by the tapered surface 22a of the securing groove 22, thereby reinforcing the connection.

In the above process, it is sufficient to perform fillet welding on the stepped portion between both mediating members, so the cross section of the welded portion may be small, and the amount of welded metal is small, so the welding work is simple. In addition, since the lower intermediate member 17 has a larger outer diameter than the upper intermediate member 13, the upward and outward step portion formed by the lower intermediate member 17 can be fillet welded, or the welded metal can be removed. is easy. Further, the amount of heat input during welding is small, and the cylindrical portion 12, lid 15, etc. are hardly affected by heat-induced distortion.
Furthermore, although the intermediary members 13 and 17 themselves are not affected, if the adhesion is impaired due to distortion due to repeated heat effects, the welded metal at the welded parts 14 and 18 with the flanges 11 and 16 should be removed. Intermediate member 1
3 and 17, and this is also an easy task since the amount of welding is small. Moreover, the intermediate member 13,
17 is sealed by the welded part 19 and kept airtight, and the weight of the lid 15 is supported by the reinforcing member 20, so even in operations where the inside of the reaction vessel 1 is under high pressure, the welded part is kept airtight. No load is applied to 19, thereby preventing loss of airtightness.

[Effects of the invention] As described in detail below, this invention provides a welding structure for a joint portion of a cylindrical body in which the end surfaces of metal cylindrical bodies are abutted against each other and joined by airtight welding. Plate-shaped intermediary members having different outer diameters are welded to the end faces of the cylindrical body, and the intermediary members are joined to each other by welding. At the same time, a flange is provided at the lower end of the cylindrical body, and a reinforcing member is provided to clamp the outer edge of the flange. The structure of the welded part is simplified and the amount of welding is reduced while maintaining airtightness, which simplifies welding work and saves time and effort. Also,
Since the amount of welding heat input is small, it is possible to prevent heat-induced distortion in cylindrical bodies, etc., extending the life of these parts or structures, and removing only the weld metal from fillet welding. The life of the intermediary member can be significantly extended, and the reinforcing member provides excellent effects such as simplifying welding and achieving strong joints.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing an embodiment of this invention, Fig. 2 is a view taken along the - arrow in Fig. 1, Fig. 3 is an enlarged view of the main part of Fig. 1, and Fig. 4 is a conventional example. The front sectional view shown in FIG. 5 is a sectional view of another conventional example. 4... Cylindrical part (upper cylindrical body), 5... Lid (lower cylindrical body), 11... Upper flange, 11a... End face, 1
3... Upper intermediate member, 16... Lower flange, 16a
... end face, 17 ... lower intermediate member, 19 ... welding part, 20 ... reinforcing member.

Claims (1)

[Scope of utility model registration request] In the welding structure of the joint of the cylindrical bodies, in which the end surfaces of metal cylindrical bodies are butted against each other and joined by airtight welding, plate-shaped intermediary members having different outer diameters are welded to the end surfaces of the cylindrical bodies, respectively. The intermediate members are joined to each other by welding, and a pair of flanges are formed at the end of the cylindrical body,
A welded structure for a joint of a cylindrical body, characterized in that a reinforcing member is attached to clamp the outer edge of the flange.