Fixing tool

Abstract

The invention relates to the field of titanium alloy smelting, in particular to a fixing tool which comprises an outer barrel and a plurality of clamping parts located in the outer barrel, the multiple clamping parts are evenly distributed around the center line of the outer barrel in the circumferential direction, a telescopic pipe is connected between each clamping part and the outer barrel, a rotating cover is rotationally arranged at the top end of the outer barrel, and a plurality of arc-shaped grooves are formed in the rotating cover. The multiple arc-shaped grooves are evenly distributed around the center of the rotating cover, one end of each arc-shaped groove is close to the center of the rotating cover, the other end of each arc-shaped groove is far away from the center of the rotating cover, and a control rod is connected to the clamping part and slidably connected into the arc-shaped grooves. According to the scheme, the problems that adjustment of the positions of the upper electrode and the lower electrode is troublesome and strenuous, operation is inconvenient, and the accuracy of adjustment of the positions of the upper electrode and the lower electrode is difficult to control are solved.

Description

[0001] This application is a divisional application of the invention patent application with the Chinese invention patent application number: 2022117163439, the patent name: Titanium alloy melting consumable electrode welding method, and the application date: December 30, 2022. Technical Field

[0002] The present invention relates to the field of titanium alloy melting, and specifically relates to a fixing tooling. Background Art

[0003] In the prior art, when melting titanium alloy into an ingot, the titanium alloy electrode is placed in a crucible for melting. The electrode in the crucible is composed of multiple sections welded together. Among them, the consumable electrode is welded below the auxiliary electrode, and the welding of the consumable electrode and the auxiliary electrode is called head welding. When multiple consumable electrodes need to be melted into one ingot, multiple consumable electrodes need to be welded together, and the welding of multiple consumable electrodes is called middle welding.

[0004] During middle welding, the two adjacent welded electrode sections are respectively named the upper electrode and the lower electrode. The welding method is as follows: the upper and lower electrodes are respectively placed at the center position of the bottom pad in the up-and-down order, then the crucible is sleeved outside the upper and lower electrodes, the bottom of the bottom pad and the crucible are connected, and then the crucible is hoisted into the furnace jacket. During welding, the mutually contacting part at the bottom of the upper electrode and the top of the lower electrode melts into welding liquid, and after the welding liquid solidifies, the bottom of the upper electrode and the top of the lower electrode are welded together.

[0005] However, the welding molten liquid will flow around at the top of the lower electrode. And because the welding is carried out inside the crucible, the welding position is far from the mouth of the crucible, the light is poor, it is not easy to observe the welding effect, and it is not easy to control the welding, so the phenomenon of welding voids is likely to occur, which further affects the stability and firmness of the welding. In the subsequent operation or the formal melting process, the lower electrode may fall off from the upper electrode, affecting the entire melting process, making the melted ingot unqualified. Since the titanium alloy material is relatively expensive, the unqualified ingot produced due to the fall of the lower electrode can only be downgraded for use, resulting in a large loss.

[0006] Meanwhile, during the process of lifting the crucible into the furnace jacket, due to the gap between the electrode and the inner wall of the crucible, the electrode will displace in the crucible, resulting in the upper electrode and the lower electrode not being located at the middle position of the crucible. The distances between the outer wall of the electrode and the inner wall of the crucible are not equal. At the same time, the displacement of the upper and lower electrodes also causes the upper electrode and the lower electrode not to be aligned. This will affect the subsequent melting process and the quality of melting. Therefore, in the prior art, in order to make the upper and lower electrodes located in the middle of the crucible before welding, after the crucible is lifted into the furnace jacket, it is also necessary to check and adjust the positions of the upper and lower electrodes in the crucible. Since the upper and lower electrodes are large in volume and heavy in weight, it is troublesome and laborious to adjust the positions of the upper and lower electrodes (for example, it is necessary to use a crowbar to adjust the positions of the upper and lower electrodes). The operation is not only inconvenient, but also difficult to control the accuracy of the position adjustment of the upper and lower electrodes. Summary of the Invention

[0007] The present invention aims to provide a fixing tooling to limit and fix the electrode, avoid the displacement of the electrode in the crucible during the transfer of the crucible, greatly reduce the subsequent situation of adjusting the position of the heavy electrode, and the operation is simple and convenient.

[0008] The structure, use and effect of the fixing tooling will be described below in combination with the method for welding self-consumable electrodes in titanium alloy melting.

[0009] The method for welding self-consumable electrodes in titanium alloy melting includes the following steps: Electrode preparation and processing: Take the upper electrode and the lower electrode, and process a groove in the middle of the end face at one end of the lower electrode; Assembly: Place the lower electrode in the middle of the bottom pad, with the end of the lower electrode having the groove facing upward, and then place one end of the upper electrode into the groove of the lower electrode; Place the crucible outside the upper electrode and the lower electrode, and connect the bottom of the crucible to the bottom pad; Use the fixing tooling to limit and fix the upper electrode and the lower electrode; Transfer: Transfer the crucible to the furnace jacket; and remove the fixing tooling from the crucible; Welding: Weld the bottom of the upper electrode and the top of the lower electrode.

[0010] The principle and advantages of this solution are: By processing a groove at the top of the lower electrode, before welding, insert the bottom of the upper electrode into the groove of the lower electrode. During welding, the molten welding liquid will remain in the groove. Limited by the groove, the welding liquid will not flow around. Thus, there is enough welding liquid contact between the bottom of the upper electrode and the top of the lower electrode. The welding joint of the lower and upper electrodes is in a full-weld state, avoiding the problem of welding voids, making the welding of the upper and lower electrodes firm and stable, reducing welding defects, improving the welding quality, and the upper and lower electrodes are not likely to fall off.

[0011] Meanwhile, the welding fluid seldom flows around in the groove to form welding beads on the surface of the lower electrode, so that there are few welding beads on the surface of the lower electrode, reducing the workload of later detecting and cleaning the welding beads.

[0012] In addition, in this solution, the electrodes are limited and fixed by a fixing tooling, which can prevent the electrodes from shifting in the crucible during the transfer of the crucible. After the crucible is transferred, the fixing tooling can be taken out of the crucible, and the electrodes will still be located in the middle of the crucible. Compared with the prior art, the electrodes will not shift, which greatly reduces the subsequent situation of adjusting the position of the heavy electrodes, and the operation is simple and convenient.

[0013] Preferably, as an improvement, both the upper electrode and the lower electrode are cylindrical, and the groove is a circular groove. The groove is set to be circular, and at the same time, both the upper electrode and the lower electrode are cylindrical. Compared with a square, a rhombus or other polygons, when the upper electrode and the lower electrode are assembled, there is no need to rotate and align the upper electrode and the lower electrode, and it is easier to insert the bottom of the upper electrode into the groove.

[0014] Preferably, as an improvement, in the electrode preparation and processing steps, a receiving groove is machined at the bottom of the groove.

[0015] Thus, before welding, a receiving groove is first machined at the bottom of the groove of the lower electrode. In this way, when the welding fluid melts during welding, it enters the receiving groove, and the receiving groove accommodates the welding fluid, which can lower the liquid level of the welding fluid, prevent the welding fluid from overflowing upward from the groove, and make the top of the solidified part after the final solidification of the welding fluid lower than the top of the groove. At the same time, the solidified part of the welding fluid extends into the receiving groove, and the solidified part of the welding fluid contacts the inner wall of the receiving groove, increasing the contact area between the solidified part of the welding fluid and the lower electrode, and making the connection between the solidified part of the welding fluid and the lower electrode relatively firm.

[0016] Preferably, as an improvement, the number of receiving grooves is one and is located in the middle of the groove. Thus, the number of receiving grooves is one and is located in the middle of the groove, which is convenient for machining the receiving groove. At the same time, in this way, the receiving groove is centrally arranged in the groove. Compared with the eccentric arrangement of the receiving groove in the groove after welding, the solidified part of the welding fluid can be evenly distributed in the groove and is evenly stressed.

[0017] Preferably, as an improvement, the fixing tooling includes an outer cylinder and a plurality of clamping parts located inside the outer cylinder. The plurality of clamping parts are evenly distributed circumferentially around the center line of the outer cylinder. A telescopic tube is connected between each clamping part and the outer cylinder. A rotating cover is rotated at the top of the outer cylinder. A plurality of arc-shaped grooves are provided on the rotating cover. The plurality of arc-shaped grooves are evenly distributed around the center of the rotating cover. One end of the arc-shaped groove is close to the center of the rotating cover, and the other end is far from the center of the rotating cover. A control rod is connected to the clamping part, and the control rod is slidably connected in the arc-shaped groove; In the assembly step, after the bottom of the crucible is connected to the bottom pad, the outer cylinder is placed into the crucible, and then the rotating cover is rotated, so that the control rod moves in the arc-shaped groove towards the center of the rotating cover, the control rod drives the clamping parts to approach each other, and the clamping parts clamp the upper electrode and the lower electrode; In the transfer step, after the crucible is transferred into the furnace jacket, the rotating cover is rotated in the reverse direction, so that the control rod moves in the arc-shaped groove away from the center of the rotating cover, the control rod drives the clamping parts to move away from each other, the clamping parts loosen the upper electrode and the lower electrode, and then the fixing tooling is taken out of the crucible.

[0018] In this solution, in the assembly step, after the outer cylinder is placed into the crucible, the outer cylinder and the clamping parts are located between the electrodes and the crucible, the distance between the multiple clamping parts is relatively large, the electrodes can be smoothly located between the multiple clamping parts, and then by rotating the rotating cover, the position of the arc-shaped groove is moved by the rotating cover, the control rod moves in the arc-shaped groove towards the center of the rotating cover, the control rod drives the clamping parts to approach each other, and the multiple clamping parts clamp the upper electrode and the lower electrode at the same time, thereby realizing the limiting of the upper electrode and the lower electrode. In this way, when the crucible is transferred, the upper electrode and the lower electrode will not move in the crucible, avoiding the problem that the upper electrode and the lower electrode are displaced and not located in the middle of the crucible. With the fixing tooling in this solution, the multiple clamping parts move simultaneously to clamp the electrodes at the same time, and the multiple clamping parts contact the electrodes at the same time, avoiding the situation that the multiple clamping parts contact the electrodes in inconsistent order and push the electrodes to move in the crucible.

[0019] After the crucible is transferred and placed stably, the rotating cover is rotated in the reverse direction, the rotating cover drives the arc-shaped groove to rotate in the reverse direction, the control rod moves in the arc-shaped groove away from the center of the rotating cover, the multiple control rods respectively drive the corresponding clamping parts to move away from each other, the multiple clamping parts loosen the upper electrode and the lower electrode at the same time, the clamping parts no longer contact the electrodes, and at this time, the fixing tooling is smoothly taken out of the crucible.

[0020] In summary, through this solution, before the transfer, the upper and lower electrodes are located in the middle of the crucible. At this time, the electrodes are limited and fixed by the fixing tooling, which can avoid the displacement of the electrodes in the crucible during the transfer of the crucible. After the crucible is transferred, the fixing tooling can be taken out of the crucible, and the electrodes will still be located in the middle of the crucible. Compared with the prior art, the electrodes will not be displaced, which greatly reduces the situation of adjusting the positions of the heavy electrodes before and after the transfer of the crucible, and the operation is simple and convenient.

[0021] When the fixing tooling in this solution is placed into the crucible, the clamping parts do not contact the electrodes, and there may be a gap between the outer wall of the outer cylinder and the inner wall of the crucible, so as to facilitate the fixing tooling to be placed into the crucible. The clamping parts in this solution can move, so as to clamp electrodes with different diameters.

[0022] Preferably, as an improvement, the rotating cover is provided with a plurality of rotating grooves, all of the plurality of rotating grooves are arc-shaped, the plurality of rotating grooves are evenly distributed around the center circumference of the rotating cover, the center of the rotating groove is concentric with the center of the rotating cover, and the top end of the outer cylinder is threadedly connected with a tightening bolt, and the tightening bolt vertically passes through the rotating groove; In the assembling step, after the clamping part clamps the upper electrode and the lower electrode, the tightening bolt is tightened; In the transferring step, first loosen the tightening bolt, and then rotate the rotating cover in the reverse direction.

[0023] Thus, through the cooperation of the rotating groove and the tightening bolt, the rotating cover is limited on the outer cylinder, and the rotating cover will not be separated from the outer cylinder. At the same time, the rotating groove is arc-shaped, and the center of the rotating groove is concentric with the center of the rotating cover. In this way, when the rotating cover rotates, the tightening bolt moves in the rotating groove, and the tightening bolt and the rotating groove will not be stuck, and the tightening bolt will not hinder the normal rotation of the rotating cover.

[0024] In the assembling step, after the clamping part clamps the upper electrode and the lower electrode, the tightening bolt is tightened, so that the rotating cover will not rotate freely on the outer cylinder, which can ensure that the clamping part stably clamps the electrode during the transfer of the crucible, and the clamping part will not loosen.

[0025] In the transferring step, first loosen the tightening bolt, so that the rotating cover can rotate freely, and thus the rotating cover can be rotated in the reverse direction.

[0026] Preferably, as an improvement, the top end of the outer cylinder is turned outward to form a folding ear, and there is an annular card slot between the folding ear and the outer cylinder. After the outer cylinder is placed in the crucible, the top of the crucible is clamped into the card slot. Thus, after the outer cylinder is placed in the crucible, the top end of the crucible is clamped into the card slot, the outer cylinder is located inside the crucible, and the folding ear is located outside the crucible, so that there is a gap between the outer wall of the outer cylinder and the inner wall of the crucible and the outer cylinder can be placed in the crucible more stably.

[0027] Preferably, as an improvement, a positioning groove is machined at the top of the crucible, and a plug is integrally formed at the top of the outer cylinder. After the outer cylinder is placed in the crucible, the plug is inserted into the positioning groove. Thus, after the fixing tooling is placed in the crucible, the plug is inserted into the positioning groove, so that when the rotating cover is rotated, the outer cylinder will not rotate on the crucible.

[0028] Preferably, as an improvement, the clamping part includes an upper clamping part and a lower clamping part, and the distance from the lower clamping part to the center line of the outer cylinder is greater than the distance from the upper clamping part to the center line of the outer cylinder. Thus, the upper clamping part clamps the upper electrode, the lower clamping part clamps the lower electrode, and the upper clamping part and the lower clamping part form a stepped shape, which can clamp the upper and lower electrodes with different diameters, and the upper and lower electrodes are clamped more stably.

[0029] Preferably, as an improvement, a viewing hole is provided in the middle of the rotating cover. The viewing hole facilitates the worker to observe the placement of the fixing tooling into the crucible and the clamping situation of the electrode by the clamping part during use. Description of the Drawings

[0030] Figure 1 It is a vertical sectional view of the crucible and the fixing tooling when the fixing tooling clamps the electrode in the crucible.

[0031] Figure 2 It is Figure 1 The top view of the rotating cover in

[0032] Figure 3 It is Figure 1 The top view of the crucible in

[0033] Figure 4 It is Figure 1 The top view sectional view of the fixing device in

[0034] Figure 5 It is Figure 1 The bottom view of the outer cylinder in

[0035] Figure 6 It is Figure 1 The top view of the outer cylinder in Detailed Description of the Preferred Embodiments

[0036] The following is a further detailed description through specific embodiments: The reference numerals in the accompanying drawings of the specification include: crucible 1, bottom pad 2, bolt 3, lower electrode 4, upper electrode 5, lower clamping part 6, upper clamping part 7, telescopic tube 8, outer cylinder 9, folding ear 10, insertion block 11, viewing hole 12, rotating cover 13, clamping block 14, control rod 15, tightening bolt 16, rotating handle 17, connecting rod 18, rotating groove 19, arc groove 20, positioning groove 21, clamping groove 22, threaded hole 23, groove 24, lifting lug 25.

[0037] Basically as shown in the attached Figures 1-6 figures: In this embodiment, the structure and use of the fixing tooling are described in combination with the titanium alloy melting consumable electrode welding method.

[0038] The titanium alloy melting consumable electrode welding method includes the following steps: S1, electrode preparation and processing: Take the upper electrode 5 and the lower electrode 4, and turn a groove 24 in the middle of the end face at one end of the lower electrode 4; in this embodiment, both the upper electrode 5 and the lower electrode 4 are cylindrical, the groove 24 is a circular groove 24, and the diameter of the upper electrode 5 is smaller than the diameter of the groove 24, so that after the upper electrode 5 is placed in the groove 24, there is a gap between the side wall of the upper electrode 5 and the inner wall of the groove 24.

[0039] S2, Assembly: Place the lower electrode 4 in the middle of the bottom pad 2. One end of the lower electrode 4 without the groove 24 is located on the bottom pad 2, and the end of the lower electrode 4 with the groove 24 faces upward. Then place one end of the upper electrode 5 into the groove 24 of the lower electrode 4, and the bottom end of the upper electrode 5 is located in the middle of the groove 24. Then lift the crucible 1 and lower it from top to bottom so that the crucible 1 is sleeved outside the upper electrode 5 and the lower electrode 4, and the bottom of the crucible 1 abuts against the bottom pad 2. Use bolts 3 to connect the bottom of the crucible 1 and the bottom pad 2. There is a gap between the upper electrode 5 and the lower electrode 4 and the inner wall of the crucible 1 in the crucible 1, and the gap is generally between 30 - 100 mm. The larger the crucible 1, the larger the gap. In this embodiment, the gap from the lower electrode 4 to the inner wall of the crucible 1 is 50 mm.

[0040] In this step, use a fixing tooling to limit and fix the upper electrode 5 and the lower electrode 4; the fixing tooling in this embodiment includes an outer cylinder 9 and a plurality of clamping parts located inside the outer cylinder 9. Referring to Figure 1 , Figure 5 and Figure 6 shown, the outer cylinder 9 in this embodiment is in the shape of a cylinder. The top of the outer cylinder 9 is integrally formed with a folded ear 10 that turns outward. The folded ear 10 is annular. There is an annular card slot 22 between the folded ear 10 and the outer cylinder 9. On the inner wall of the card slot 22, there is an integrally formed insertion block 11. The number of insertion blocks 11 is two, and they are evenly distributed around the center circumference of the outer cylinder 9. The shape of the insertion block 11 is cylindrical. Of course, in other embodiments, the number of insertion blocks 11 can also be three, four, etc.

[0041] Referring to Figure 1 , Figure 4 shown, the number of clamping parts in this embodiment is four. Of course, in other embodiments, it can also be three, five, etc. The top view shape of the clamping part is arc-shaped. The four clamping parts are evenly distributed around the center line circumference of the outer cylinder 9. When the four clamping parts are fitted together, they can be combined into a circle. For the thickness of the outer cylinder 9 and the clamping parts, it can be specifically set according to the gap between the electrode and the inner wall of the crucible 1. For example, when the gap between the lower electrode 4 and the inner wall of the crucible 1 is 50 mm, the thickness of the outer cylinder 9 and the thickness of the clamping parts can both be set to 5 mm. A telescopic tube 8 is welded between each clamping part and the inner wall of the outer cylinder 9. The telescopic tube 8 is two tubes sleeved together and slidably connected. A rubber pad is bonded to the side wall of the clamping part away from the outer cylinder 9. The clamping part in this embodiment includes an upper clamping part 7 and a lower clamping part 6. The distance from the lower clamping part 6 to the center line of the outer cylinder 9 is greater than the distance from the upper clamping part 7 to the center line of the outer cylinder 9. The upper clamping part 7 and the lower clamping part 6 are integrally formed. Thus, the upper clamping part 7 clamps the upper electrode 5 with a smaller diameter, and the lower clamping part 6 clamps the lower electrode 4 with a larger diameter.

[0042] Referring to Figure 1 , Figure 2 andFigure 6 As shown, a circular rotating cover 13 is rotatably connected to the top end of the outer cylinder 9. The specific rotation method is as follows: Two threaded holes 23 are provided at the top end of the outer cylinder 9 (in other embodiments, the number of threaded holes 23 can also be three, four, etc.). The two threaded holes 23 are evenly distributed around the central circumference of the outer cylinder 9. Two rotating grooves 19 are provided on the rotating cover 13. Both rotating grooves 19 are arc-shaped. The two rotating grooves 19 are evenly distributed around the central circumference of the rotating cover 13. The center of the rotating groove 19 is concentric with the center of the rotating cover 13. The rotating cover 13 is placed on the top end of the outer cylinder 9, and a tightening bolt 16 is threadedly connected and tightened in the threaded hole 23 at the top end of the outer cylinder 9. The tightening bolt 16 vertically passes through the rotating groove 19. In this embodiment, the part of the tightening bolt located in the rotating groove 19 is a smooth rod without threads. Thus, through the limitation of the tightened threads, the rotating cover 13 is located on the top end of the outer cylinder 9. By not tightening the tightening bolt 16, with the cooperation of the tightening bolt 16 and the rotating groove 19, the rotating cover 13 can rotate on the top end of the outer cylinder 9.

[0043] Combined with Figure 1 and Figure 2 As shown, four arc-shaped grooves 20 are provided on the rotating cover 13. The four arc-shaped grooves 20 are evenly distributed around the center of the rotating cover 13. One end of the arc-shaped groove 20 is close to the center of the rotating cover 13, and the other end is far from the center of the rotating cover 13. A control rod 15 is welded to the clamping part. In this embodiment, the control rod 15 is welded to the upper clamping part 7. The control rod 15 is bent upward. The top end of the control rod 15 penetrates upward into the arc-shaped groove 20 and can slide in the arc-shaped groove 20. To prevent the rotating cover 13 from detaching from the top end of the outer cylinder 9 and ensure that the top end of the control rod 15 does not detach from the arc-shaped groove 20, a clamping block 14 is fixed to the top end of the control rod 15 by a screw. The clamping block 14 abuts against the top of the rotating cover 13, so that the rotating cover 13 will not move upward and detach from the outer cylinder 9 and the control rod 15. In addition, a circular viewing hole 12 is provided in the middle of the rotating cover 13. At the same time, an annular rotating handle 17 is provided on the outside of the rotating cover 13. The rotating handle 17 and the rotating cover 13 are coaxially arranged. A connecting rod 18 is welded between the rotating handle 17 and the outer side wall of the rotating cover 13.

[0044] Combined with Figure 3 As shown, two positioning grooves 21 are machined at the top of the crucible 1. The two positioning grooves 21 are evenly distributed around the central circumference of the crucible 1.

[0045] In this step, after the bottom of the crucible 1 and the bottom pad 2 are connected by bolts 3, combined with Figure 1As shown, the outer cylinder 9 is placed into the crucible 1, and the insertion block 11 is inserted into the positioning groove 21 at the top of the crucible 1. Then, the rotating cover 13 is rotated clockwise by turning the handle 17. The tightening bolt 16 slides relatively in the rotating groove 19. Under the limiting effect of the arc-shaped groove 20, the control rod 15 moves towards the center of the rotating cover 13 within the arc-shaped groove 20. The control rod 15 drives the clamping parts to approach each other, and the upper clamping part 7 and the lower clamping part 6 clamp the upper electrode 5 and the lower electrode 4 respectively. After the clamping parts clamp the upper electrode 5 and the lower electrode 4, the tightening bolt 16 is tightened so that the head of the tightening bolt 16 tightly abuts against the top of the rotating cover 13.

[0046] S3, Transfer: As shown in combination with Figure 1 and Figure 3 At the top of the crucible 1, a lifting lug 25 is fixed. A hanging hole is provided on the lifting lug 25. The lifting lug 25 and the hanging hole are provided to facilitate connection with a lifting rope. The crucible 1 is lifted upward by a crane, and the crucible 1 and the electrodes are transferred into the furnace sleeve together.

[0047] After the transfer, the tightening bolt 16 is loosened, but do not unscrew the tightening bolt 16 from the top of the outer cylinder 9. Then, the rotating cover 13 is rotated counterclockwise. The control rod 15 moves under the limit of the arc-shaped groove 20. The control rod 15 moves away from the center of the rotating cover 13 within the arc-shaped groove 20. The control rod 15 drives the multiple clamping parts to move away from each other. The clamping parts loosen the upper electrode 5 and the lower electrode 4, and then the fixing tooling is smoothly taken out from the crucible 1.

[0048] S4, Welding: After the auxiliary electrode is placed into the crucible 1, the bottom of the upper electrode 5 and the top of the lower electrode 4 are welded. During welding, the contacting part of the upper electrode 5 and the lower electrode 4 melts. The molten welding liquid will remain in the groove 24. The molten welding liquid will not flow around under the limit of the groove 24, so that there is enough molten welding liquid contact between the bottom of the upper electrode 5 and the top of the lower electrode 4. The welded part of the lower electrode 4 and the upper electrode 5 is in a full-weld state, avoiding the problem of welding voids, making the welding of the upper electrode 5 and the lower electrode 4 firm and stable, reducing welding defects, improving welding quality, and making it difficult for the upper electrode 5 and the lower electrode 4 to fall off.

[0049] In addition, through this embodiment, the fixing tooling limits and fixes the electrodes before transfer. After the transfer, the fixing tooling is taken out. In this way, the upper electrode 5 and the lower electrode 4 will not shift in the crucible 1. The upper electrode 5 and the lower electrode 4 can be in an aligned state, which can ensure uniform welding of the upper electrode 5 and the lower electrode 4. At the same time, the upper electrode 5 and the lower electrode 4 are also located in the middle of the crucible 1, which can ensure the quality of melting.

[0050] The above are only embodiments of the present invention, and common general technical solutions and / or features in the solutions are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solutions of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope claimed in this application shall be subject to the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. Fixed tooling, Characterized in that: It includes an outer cylinder and a plurality of clamping parts located inside the outer cylinder. The plurality of clamping parts are evenly distributed circumferentially around the center line of the outer cylinder. A telescopic tube is connected between each clamping part and the outer cylinder. A rotating cover rotates at the top of the outer cylinder. A plurality of arc-shaped grooves are provided on the rotating cover. The plurality of arc-shaped grooves are evenly distributed around the center of the rotating cover. One end of the arc-shaped groove is close to the center of the rotating cover, and the other end is far from the center of the rotating cover. A control rod is connected to the clamping part, and the control rod is slidably connected in the arc-shaped groove.

2. The fixed tooling according to claim 1, Characterized in that: A plurality of rotating grooves are provided on the rotating cover. The plurality of rotating grooves are all arc-shaped. The plurality of rotating grooves are evenly distributed circumferentially around the center of the rotating cover. The center of the circle of the rotating groove is concentric with the center of the rotating cover. The top of the outer cylinder is threadedly connected with a tightening bolt, and the tightening bolt vertically passes through the rotating groove.

3. The fixed tooling according to claim 1, Characterized in that: The top of the outer cylinder is folded outward to form a folding ear, and an annular clamping groove is formed between the folding ear and the outer cylinder.

4. The fixed tooling according to claim 1, Characterized in that: An insertion block is integrally formed at the top of the outer cylinder.

5. The fixed tooling according to claim 1, Characterized in that: The clamping part includes an upper clamping part and a lower clamping part. The distance from the lower clamping part to the center line of the outer cylinder is greater than the distance from the upper clamping part to the center line of the outer cylinder.

6. The fixed tooling according to claim 1, Characterized in that: A viewing hole is provided in the middle of the rotating cover.

7. The fixed tooling according to claim 1, Characterized in that: The outer cylinder is in the shape of a cylinder.

8. The fixed tooling according to claim 1 or 5, Characterized in that: The number of the clamping parts is 3-5.

9. The fixed tooling according to claim 1 or 5, Characterized in that: The top view shape of the clamping part is arc-shaped.

10. The fixed tooling according to claim 1, Characterized in that: A clamping block is fixed to the top end of the control rod by a screw, and the clamping block abuts against the top of the rotating cover.

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