Forming device and method for tantalum bellow expansion joint

Abstract

The invention discloses a tantalum bellow expansion joint forming device and method.The device comprises a workbench, a tantalum bushing, a bulging mechanism, a jacking mechanism and a clamping mechanism, the clamping mechanism is arranged on the jacking mechanism, the tantalum bushing is arranged on the bulging mechanism in a sleeving mode, and the bottom end of the tantalum bushing is clamped and fixed to the jacking mechanism through the clamping mechanism; the bulging mechanism is arranged above the workbench and used for extruding the barrel wall, at the current corresponding position, of the tantalum lining barrel and enabling the barrel wall to expand outwards to form a corrugated protrusion. According to the method, the bulging disc expands outwards to extrude the tantalum lining barrel, so that the barrel wall expands outwards to form the corrugated protrusions, friction between the disc body and the inner wall of the barrel is avoided in the bulging machining and bulging angle adjusting process, the inner wall of the tantalum lining barrel is fully protected, the overall performance of the formed tantalum corrugated pipe is improved, and the service life of the tantalum corrugated pipe is prolonged. And the processed expansion joint product is better in quality and stronger in performance.

Description

Technical Field

[0001] The invention relates to the technical field of bellows expansion joint processing, in particular to a forming device and method for a tantalum bellows expansion joint. Background Art

[0002] Tantalum bellows expansion joint is a compensating device used in pipeline systems. It uses the special properties of tantalum to absorb thermal expansion and mechanical vibration in pipeline systems, thereby protecting pipeline systems from damage. Tantalum bellows expansion joints are widely used in pipeline systems in chemical, petroleum, electric power, metallurgy and other industries. Especially in high temperature, high pressure and strong corrosion environments, tantalum bellows expansion joints can effectively reduce the stress of pipeline systems and improve the safety and stability of pipelines. Tantalum bellows expansion joints are mainly formed by extruding the tantalum liner with a hydraulic press to form a corrugated shape. Hydraulic forming is the key step in the formation of corrugated expansion joints. There are usually three forming methods: hydraulic, rolling and bulging.

[0003] After searching, it was found that the patent document with publication number CN111229912A provides a tantalum bellows expansion joint forming device and method, wherein the tantalum liner is fixed by a split mold, and after being fixed, the tantalum liner is driven to rotate by a main shaft and a four-jaw chuck. When the tantalum liner rotates, a rotatable wheel is arranged on one side thereof, and the blade of the wheel rotates to squeeze the cylinder wall of the tantalum liner to form a corrugated groove on the cylinder wall. However, this processing method will cause friction between the wheel and the cylinder wall. The tantalum liner itself is relatively thin, and the friction will cause more wear on the cylinder wall, and the roughness of the cylinder surface will be higher. Correspondingly, the liner will also generate more stress after processing and forming, and the processed product quality is not high and the performance is poor. At the same time, when the liner needs to be removed during processing and forming, the split mold must be disassembled first, and then the finished product can be removed. The split mold is composed of multiple independent tile-shaped mold pieces, and these mold pieces need to be removed one by one before the finished product can be removed, which is time-consuming, labor-intensive and inconvenient. Therefore, a forming device and method for a tantalum bellows expansion joint is proposed, which can avoid wear of the tantalum liner and keep the cylinder wall smooth, improve product quality and performance, and is convenient for material loading and unloading, and saves time and effort. Summary of the invention

[0004] The object of the present invention is to provide a forming device and method for a tantalum bellows expansion joint, so as to solve the problems of easy wear of the inner wall of the tantalum liner, poor quality of the finished product and troublesome material loading and unloading proposed in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A forming device for a tantalum bellows expansion joint comprises a workbench, a tantalum liner, an expansion mechanism, a lifting mechanism and a clamping mechanism, wherein the clamping mechanism is arranged on the lifting mechanism, the tantalum liner is sleeved on the expansion mechanism, and the bottom end of the tantalum liner is clamped and fixed on the lifting mechanism by the clamping mechanism, the expansion mechanism is arranged above the workbench, and is used to squeeze the cylinder wall at the current corresponding position of the tantalum liner and expand the cylinder wall outward to form a corrugated protrusion, the lifting mechanism is slidably arranged above the workbench corresponding to the outer side of the expansion mechanism, the lifting mechanism is used to move the tantalum liner up and down and cooperate with the expansion mechanism to form a plurality of complete corrugated protrusions at all positions of the cylinder wall of the tantalum liner to be processed.

[0006] As a further solution of the present invention: the bulging mechanism includes a cylindrical casing, the top of the casing is provided with an opening, and a packaging plate is provided in the opening, a support platform is fixed at the opening at the top of the casing through the packaging plate, a rotating platform is rotatably connected above the support platform, a sliding platform is fixed above the rotating platform, an upper surface of the sliding platform is slidably connected to an bulging disk, a conical extrusion column is provided at the center above the bulging disk, through holes are provided on the inner walls of the support platform, the rotating platform and the sliding platform corresponding to one side of the conical extrusion column, and the conical extrusion column slides through the through holes, an oil cylinder is installed on the side of the casing corresponding to the conical extrusion column, a one-way transmission structure is provided at one end of the oil cylinder piston rod, the one-way transmission structure is connected to the bottom end of the conical extrusion column, and the one-way transmission structure is used to drive the rotating platform to rotate in one direction when the conical extrusion column moves upward.

[0007] As a further solution of the present invention: an external gear ring is fixed to the outside of the rotating table, and a plurality of external gears are meshingly connected to the outside of the external gear ring. The plurality of external gears are rotatably connected to the top of the supporting table through a rotating shaft, and the plurality of external gears cooperate with the external gear ring to keep the rotating table stable when rotating.

[0008] As a further solution of the present invention: the one-way transmission structure comprises a driving shaft, a driven shaft, an active rod and a driven rod, the top end of the driving shaft is connected and fixed to the bottom end of the tapered extrusion column, and the bottom end of the driving shaft is connected and fixed to the top end of the oil cylinder piston rod, the driven shaft is rotatably connected in the housing, and the top end of the driven shaft is connected and fixed to one end of the external gear shaft on the corresponding side, a driving helical gear and a driven helical gear are respectively sleeved and fixed on the shaft bodies of the driving shaft and the driven shaft, the active rod is rotatably connected to a side of the housing corresponding to the driving shaft, a driving gear is sleeved and fixed on the active rod, the driving gear is meshed and connected with the driving helical gear, the driven rod is rotatably connected to a side of the housing corresponding to the driven shaft, a driven gear is sleeved and fixed on the driven rod, and the driven gear is meshed and connected with the driven helical gear; The active rod and the driven rod are arranged front and back oppositely, an active end face ratchet is fixed to the end of the active rod facing the driven rod, a mounting plate is fixed to the end of the driven rod facing the active rod, a guide shaft is fixed at the center of one side of the mounting plate surface, a guide sleeve is slidably sleeved on the outside of the guide shaft, a driven end face ratchet is sleeved and fixed on the outside of the guide sleeve, the driven end face ratchet is meshed and connected with the active end face ratchet, a second spring is sleeved on the shaft body of the guide shaft, and two ends of the second spring are respectively connected and fixed to the mounting plate and the driven end face ratchet.

[0009] As a further solution of the present invention: the jacking mechanism includes a jacking plate and a jacking cylinder, the jacking plate is a disc-shaped structure, and a through hole for accommodating the expansion mechanism is opened at the center of its inner wall, the jacking cylinder is embedded in the workbench, and one end of the jacking cylinder piston rod extends to the top of the workbench and is connected and fixed to the jacking plate.

[0010] As a further solution of the present invention: the clamping mechanism includes an inner ring clamping structure and an outer ring clamping structure, the inner ring clamping structure and the outer ring clamping structure are correspondingly arranged to clamp the cylinder wall of the tantalum liner from the inner and outer sides respectively, the inner ring clamping structure includes a plurality of inner ring clamping cylinders, one end of the piston rods of the plurality of inner ring clamping cylinders are fixed with an inner ring arc-shaped abutment plate, the outer ring clamping structure includes a plurality of outer ring clamping cylinders, one end of the piston rods of the plurality of outer ring clamping cylinders are fixed with an outer ring arc-shaped abutment plate, the plurality of inner ring arc-shaped abutment plates and the plurality of outer ring arc-shaped abutment plates correspond to each other one by one and are equidistantly arranged around the upper surface of the lifting plate, the plurality of inner ring clamping cylinders cooperate with the plurality of inner ring arc-shaped abutment plates to abut the cylinder wall of the tantalum liner from the inside, and the plurality of outer ring clamping cylinders cooperate with the plurality of outer ring arc-shaped abutment plates to abut the cylinder wall of the tantalum liner from the outside.

[0011] As a further solution of the present invention: a plurality of guide grooves are formed at equal intervals on the upper surface of the sliding table, guide rods are fixed in the plurality of guide grooves, guide blocks are slidably sleeved on the rod bodies of the plurality of guide rods, and the plurality of guide blocks are respectively slidably connected in the corresponding guide grooves, a first spring is sleeved on the rod bodies of the plurality of guide rods, and the two ends of the plurality of first springs are respectively connected and fixed to the corresponding guide blocks and the inner wall of one side of the guide groove.

[0012] As a further solution of the present invention: the expansion disk includes a plurality of split expansion fan plates, and the plurality of split expansion fan plates are arranged one by one corresponding to the plurality of guide grooves, and the bottoms of the plurality of split expansion fan plates are respectively connected and fixed to the guide blocks on the corresponding side, and the plurality of split expansion fan plates surround the upper surface of the sliding table and form a disc-shaped structure, and a hole for passing the conical extrusion column is opened at the center thereof, and the plurality of split expansion fan plates are respectively used in cooperation with the corresponding guide grooves, the guide blocks, the guide rods and the first spring, so that they expand outward when the conical extrusion column moves downward and contract inward when the conical extrusion column moves upward, and when the plurality of split expansion fan plates contract inwardly, they rotate synchronously through the cooperation of the one-way transmission structure and the rotating table.

[0013] At the same time, the present invention also discloses a method for forming a tantalum bellows expansion joint, which comprises the following steps: S1. Install the tantalum liner: S101, sleeve the tantalum liner on the outside of the bulging mechanism from top to bottom and place the bottom end of the liner on the lifting plate; S102, driving the inner ring clamping cylinder and the outer ring clamping cylinder, so that the inner ring arc-shaped abutment plate and the outer ring arc-shaped abutment plate respectively abut against the inner and outer side walls of the bottom of the tantalum liner from the inner and outer sides, and clamping and fixing the bottom end of the tantalum liner on the lifting plate; S2, Tantalum liner bulging: S201, the driving cylinder drives the driving shaft to move downward and drives the conical extrusion column to move downward synchronously, the side wall of the conical extrusion column squeezes the split bulging fan plate and makes it expand outward, and multiple split bulging fan plates expand outward synchronously and squeeze the inner wall of the tantalum liner, so that the wall of the liner expands outward and initially forms a corrugated bulge; S202, the driving cylinder drives the driving shaft to move upward and drives the conical extrusion column to move upward synchronously. When the conical extrusion column moves upward, the rotating table is driven to rotate through the coordinated use of various components in the one-way transmission structure. The rotating table drives the multiple split bulging fan plates above it to rotate synchronously and adjust the angle of the fan plates for outward expansion processing; S203, repeating S201 and S202 until a complete corrugated protrusion is formed on the wall of the tantalum liner at the current expansion position; S3, Tantalum bellows expansion joint integral forming: S301, adjusting the height of the tantalum liner, driving the lifting cylinder to drive the tantalum liner above it to move upward, and moving the unexpanded cylinder wall to one side of the expansion disk; S302, run S2; S303, repeating S301 and S302 until all positions to be processed on the wall of the tantalum liner are completely corrugated and the tantalum liner is expanded into a bellows shape; S4. Remove the formed tantalum bellows expansion joint: S401, driving the lifting cylinder to push the tantalum liner above it upward; S402, reversely driving the inner ring clamping cylinder and the outer ring clamping cylinder so that the inner ring arc-shaped abutment plate and the outer ring arc-shaped abutment plate no longer abut against the inner and outer side walls of the tantalum liner; S403, take out the tantalum liner from the top to obtain a complete tantalum bellows expansion joint body.

[0014] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the tantalum liner is expanded and squeezed outward by the expansion disk so that the cylinder wall expands outward and forms a corrugated protrusion. The degree of the protrusion can be freely controlled by controlling the downward movement distance of the conical extrusion column. The user can customize the shape of the tantalum bellows according to the needs, and the processing and use are relatively convenient. At the same time, the expansion disk will only expand outward when performing expansion processing on the tantalum liner, and there will be no relative sliding between the expansion disk and the inner wall of the tantalum liner. When the expansion angle of the expansion disk needs to be adjusted, the disk body of the expansion disk will first shrink inward and then rotate, further avoiding the problem of friction between the disk body and the inner wall of the cylinder during the process of adjusting the expansion angle, which may damage the cylinder wall. The inner wall of the tantalum liner is fully protected. After the expansion processing is completed, the inner wall of the tantalum liner can remain smooth, avoiding the problem of high stress caused by the high surface roughness of the inner wall of the cylinder due to friction, thereby improving the overall performance of the formed tantalum bellows and making the processed expansion joint product quality The quantity is better; in the present invention, after the tantalum liner is expanded, it is lifted up by the lifting mechanism, and the clamping mechanism is released at the same time. The user can directly take out the formed tantalum bellows from the top of the expansion mechanism without disassembling the mold. At the same time, the expansion mechanism and the tantalum liner are relatively independent, and the expansion mechanism can be used without disassembling. After completing the processing of one liner, the processing of the next liner can be carried out immediately, the processing efficiency is higher, the material taking and loading are more convenient, and time and labor are saved; in the present invention, the expansion mechanism includes two processing steps of expansion and adjusting the expansion angle when expanding the tantalum liner. The two processing steps are independent of each other and are performed alternately. The alternation of the two processing steps can be achieved only by setting a one-way transmission structure. The product structure is simpler. The one-way transmission structure is a traditional mechanical structure, which is safe and reliable. When the two processing steps are performed alternately, the linkage of each component is stronger, the response speed is faster, the operation is more stable, and the manufacturing and maintenance costs will be lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is an exploded view of the present invention.

[0018] Figure 3 It is a schematic diagram of the connection structure between the lifting mechanism and the clamping mechanism in the present invention.

[0019] Figure 4It is a schematic diagram of the internal structure of the bulging mechanism in the present invention.

[0020] Figure 5 It is an exploded diagram of the bulging mechanism in the present invention.

[0021] Figure 6 It is a schematic diagram of the structure of the sliding table in the bulging mechanism.

[0022] Figure 7 It is a schematic diagram of the connection structure of the rotating table, sliding table and supporting table in the bulging mechanism.

[0023] Figure 8 It is a structural schematic diagram of the one-way transmission structure in the bulging mechanism.

[0024] Fig. 9 This is an exploded diagram of the active rod and the driven rod in the one-way transmission structure.

[0025] Fig.10 This is a state diagram of the bulging disk in the bulging mechanism when it expands outward.

[0026] Fig.11 This is a state diagram of the expansion disk in the expansion mechanism when it contracts inward.

[0027] Notes on reference numerals: 1-working table, 2-tantalum liner, 3-bulging mechanism, 31-casing, 32-packaging plate, 33-support table, 34-oil cylinder, 35-rotating table, 351-external gear, 352-external gear ring, 36-sliding table, 361-guide groove, 362-guide rod, 363-guide block, 364-first spring, 37-bulging disk, 371-split bulging fan plate, 38-conical extrusion column, 39-one-way transmission structure, 391-driving shaft, 392-driving threaded gear, 393-from Driving shaft, 394-driven threaded gear, 395-active rod, 396-active gear, 397-active end face ratchet, 398-driven end face ratchet, 399-guide shaft, 3910-second spring, 3911-driven rod, 3912-driven gear, 3913-guide sleeve, 3914-mounting plate, 4-lifting mechanism, 41-lifting plate, 42-lifting cylinder, 5-clamping mechanism, 51-outer ring clamping cylinder, 52-outer ring arc-shaped abutment plate, 53-inner ring clamping cylinder, 54-inner ring arc-shaped abutment plate. DETAILED DESCRIPTION

[0028] The following embodiments will be described in detail with reference to the accompanying drawings. In the drawings or descriptions, similar or identical parts use the same reference numerals, and in actual applications, the shape, thickness or height of each component may be enlarged or reduced. The embodiments listed in the present invention are only used to illustrate the present invention and are not used to limit the scope of the present invention. Any obvious modifications or changes made to the present invention do not depart from the spirit and scope of the present invention.

[0029] See also Figures 1 to 11 In an embodiment of the present invention, a forming device for a tantalum bellows expansion joint includes a workbench 1, a tantalum liner 2, a bulging mechanism 3, a lifting mechanism 4 and a clamping mechanism 5. The bulging mechanism 3 is arranged above the workbench 1, the lifting mechanism 4 is slidably arranged above the workbench 1 corresponding to the outer side of the bulging mechanism 3, the clamping mechanism 5 is arranged on the lifting mechanism 4, the tantalum liner 2 is sleeved on the bulging mechanism 3, and the tantalum liner 2 is clamped and fixed on the lifting mechanism 4 by the clamping mechanism 5. The tantalum liner 2 can be lifted upward by the lifting mechanism 4. During the lifting process, the inner wall of the tantalum liner 2 is successively bulged outward from top to bottom to form a corrugated protrusion through the bulging mechanism 3.

[0030] See also Figures 2-3 The lifting mechanism 4 includes a lifting plate 41 and a lifting cylinder 42. The lifting plate 41 is a disc-shaped structure, and a through hole for accommodating the bulging mechanism 3 is opened at the center of its inner wall. The lifting cylinder 42 is embedded and installed in the workbench 1, and one end of the piston rod of the lifting cylinder 42 extends to the top of the workbench 1 and is connected and fixed to the lifting plate 41. The lifting plate 41 can be pushed upward by the lifting cylinder 42; The clamping mechanism 5 includes an inner ring clamping structure and an outer ring clamping structure, which are arranged correspondingly to clamp the wall of the tantalum liner 2 from the inner and outer sides respectively. The inner ring clamping structure includes a plurality of inner ring clamping cylinders 53, and one end of the piston rod of the plurality of inner ring clamping cylinders 53 is fixed with an inner ring arc-shaped abutment plate 54. The outer ring clamping structure includes a plurality of outer ring clamping cylinders 51, and one end of the piston rod of the plurality of outer ring clamping cylinders 51 is fixed with an outer ring arc-shaped abutment plate 52. The plurality of inner ring arc-shaped abutment plates 54 and the plurality of outer ring arc-shaped abutment plates 52 correspond to each other one by one and are arranged around the upper surface of the lifting plate 41 at equal intervals. The plurality of inner ring clamping cylinders 53 cooperate with the plurality of inner ring arc-shaped abutment plates 54 to abut the wall of the tantalum liner 2 from the inside, and the plurality of outer ring clamping cylinders 51 cooperate with the plurality of outer ring arc-shaped abutment plates 52 to abut the wall of the tantalum liner 2 from the outside.

[0031] See also Figures 4 to 7The bulging mechanism 3 includes a cylindrical casing 31, an opening is provided at the top of the casing 31, and a packaging plate 32 is provided in the opening, a support platform 33 is fixed to the opening at the top of the casing 31 through the packaging plate 32, a rotating table 35 is rotatably connected to the top of the support platform 33, a sliding table 36 is fixed to the top of the rotating table 35, a bulging disk 37 is slidably connected to the upper surface of the sliding table 36, and a conical extrusion column 38 is provided at the center above the bulging disk 37, and a through hole is provided on the inner wall of the support platform 33, the rotating table 35 and the sliding table 36 corresponding to the side of the conical extrusion column 38, and the conical extrusion column 38 slides through the through hole, and an oil cylinder 34 is installed on the side of the casing 31 corresponding to the conical extrusion column 38, and a one-way transmission structure 39 is provided at one end of the piston rod of the oil cylinder 34, and the one-way transmission structure 39 is connected to the bottom end of the conical extrusion column 38; In this embodiment, the bulging disc 37 is driven to expand outward or contract inward on the upper surface of the sliding table 36 by moving the conical extrusion column 38 up and down. When the conical extrusion column 38 moves down, the side wall of the column laterally squeezes the inner wall of the bulging disc 37, and the bulging disc 37 expands outward under the extrusion. At this time, the outer wall of the bulging disc 37 will resist and squeeze the inner wall of the tantalum liner 2, so that the cylinder wall bulges outward and initially forms a corrugated shape. When the conical extrusion column 38 moves up, the side wall of the column gradually separates from the inner wall of the bulging disc 37, and the bulging disc 37 is no longer pushed by the extrusion. It gradually contracts inward and resets under the action of the spring. At the same time, the conical extrusion column 38 is moved upward by the one-way transmission structure 3 9, the rotating table 35 will be driven to rotate. When the rotating table 35 rotates, the bulging disk 37 located above it rotates synchronously. When the conical extrusion column 38 stops moving up, the bulging disk 37 stops rotating immediately. At this time, the bulging disk 37 rotates to complete an angle. When it expands outward again, the bulging processing angle also changes accordingly. By adjusting the bulging angle multiple times, a complete circle of corrugated protrusions can be processed on the inner wall of the tantalum liner 2. After the current position of the liner body is processed, the tantalum liner 2 is continuously moved upward by the lifting mechanism 4. After moving a distance, the cylinder body is bulged again, and finally the cylinder body can be bulged from top to bottom in sequence to form multiple circles of complete corrugated protrusions, and the tantalum bellows is formed; A plurality of guide grooves 361 are formed around the upper surface of the sliding table 36 at equal intervals, and a plurality of guide rods 362 are fixed in each of the guide grooves 361. A plurality of guide rods 362 are slidably sleeved with guide blocks 363 on their rod bodies, and the plurality of guide blocks 363 are respectively slidably connected in the corresponding guide grooves 361. A first spring 364 is sleeved on the rod bodies of the plurality of guide rods 362, and the two ends of the plurality of first springs 364 are respectively connected and fixed to the corresponding guide blocks 363 and the inner wall of one side of the guide groove 361. An outer ring gear 352 is sleeved and fixed to the outside of the rotating table 35, and a plurality of external gears 351 are meshed and connected to the outer side of the external ring gear 352, and the plurality of external gears 351 are all connected through The expansion disk 37 is rotatably connected to the top of the support platform 33 through the rotating shaft. Through the coordinated use of the guide groove 361 and the guide rod 362, the expansion disk 37 can slide more smoothly on the sliding platform 36. The sliding direction of the expansion disk 37 is consistent with the length direction of the guide groove 361. The expansion disk 37 always slides in a straight line outward or inward when sliding. When the expansion disk 37 is not squeezed, the first spring 364 can drive the expansion disk 37 to shrink inward and reset. When the expansion disk 37 shrinks inward, its outer wall no longer squeezes the inner wall of the tantalum liner 2, so as to avoid the expansion disk 37 rubbing against the inner wall of the tube when rotating to adjust the angle, thereby protecting the inner wall of the tantalum liner 2 and preventing the inner wall from being worn.

[0032] See also Figures 10-11 The bulging plate 37 includes a plurality of split bulging fan plates 371, and the plurality of split bulging fan plates 371 are arranged one by one with the plurality of guide grooves 361, and the bottoms of the plurality of split bulging fan plates 371 are respectively connected and fixed with the guide blocks 363 on the corresponding side, and the plurality of split bulging fan plates 371 surround to form a disc-shaped structure, and a hole for passing the conical extrusion column 38 is opened at the center thereof. In this embodiment, the split bulging fan plates 371 are arranged in six, and each split bulging fan plate 371 is provided with a plurality of guide grooves 361. The angle of the integral bulging fan plate 371 is 60 degrees. The six split bulging fan plates 371 are arranged 360 degrees around the upper surface of the sliding table 36. When the conical extrusion column 38 moves downward, the outer wall of the column gradually squeezes the inner walls of the multiple split bulging fan plates 371, and gradually pushes the multiple split bulging fan plates 371 outward. As the fan plates move outward, the outer walls of the fan plates gradually squeeze the wall of the tantalum liner 2, and gradually stretch the wall outward until it is formed into a corrugated shape.

[0033] See also Figures 8-9The one-way transmission structure 39 includes a driving shaft 391, a driven shaft 393, a driving rod 395 and a driven rod 3911. The top end of the driving shaft 391 is connected and fixed to the bottom end of the conical extrusion column 38, and the bottom end of the driving shaft 391 is connected and fixed to the top end of the piston rod of the oil cylinder 34. The driven shaft 393 is rotatably connected in the housing 31, and the top end of the driven shaft 393 is connected and fixed to one end of the rotating shaft of the external gear 351 on the corresponding side. The driving shaft 391 and the driven shaft 393 are respectively sleeved and fixed with a driving shaft 395 and a driven shaft 3911. The active helical gear 392 and the driven helical gear 394, the active rod 395 is rotatably connected to the side of the housing 31 corresponding to the active shaft 391, the active rod 395 is sleeved and fixed with a driving gear 396, the driving gear 396 is meshed and connected with the active helical gear 392, the driven rod 3911 is rotatably connected to the side of the housing 31 corresponding to the driven shaft 393, the driven rod 3911 is sleeved and fixed with a driven gear 3912, the driven gear 3912 is meshed and connected with the driven helical gear 394; The active rod 395 and the driven rod 3911 are arranged front and back oppositely, and an active end face ratchet 397 is fixed to one end of the active rod 395 facing the driven rod 3911, and a mounting plate 3914 is fixed to one end of the driven rod 3911 facing the active rod 395. A guide shaft 399 is fixed at the center of one side of the mounting plate 3914. A guide sleeve 3913 is slidably sleeved on the outside of the guide shaft 399. A guide structure is arranged between the guide shaft 399 and the guide sleeve 3913. The guide structure is a guide bar-guide groove structure. A driven end face ratchet 398 is sleeved and fixed on the outside of the guide sleeve 3913. The driven end face ratchet 398 is meshed and connected with the active end face ratchet 397. A second spring 3910 is sleeved on the shaft body of the guide shaft 399. The two ends of the second spring 3910 are respectively connected and fixed to the mounting plate 3914 and the driven end face ratchet 398. In this embodiment, the driving shaft 391 is pulled downward by the oil cylinder 34 and the conical extrusion column 38 is driven to move downward synchronously. During the downward movement, the conical extrusion column 38 pushes the split bulging fan plate 371 through its side wall extrusion. After the fan plate expands outward, it squeezes the cylinder wall of the tantalum liner 2 and expands it outward to form a bulge. By adjusting the extrusion angle and extruding multiple times, a complete circle of corrugated bulges is processed at the cylinder wall at the current position. During the extrusion process, the split bulging fan plate 371 only expands outward and does not deflect, thereby avoiding the problem of rotation and friction against the cylinder wall during extrusion. When the oil cylinder 34 pushes the driving shaft 391 upward and drives the conical extrusion column 38 to move upward synchronously, the side wall of the conical extrusion column 38 gradually separates from the inner side wall of the split bulging fan plate 371, and the fan plate gradually returns inward under the action of the first spring 364, and the outer side wall of the fan plate no longer squeezes the cylinder wall of the tantalum liner 2, and at this time, the split bulging fan plate 371 will rotate under the drive of the rotating table 35, and the placement angle of each split bulging fan plate 371 will be adjusted. After the angle is adjusted, a second expansion and extrusion is performed, and the area that was not processed during the first extrusion is processed again, and this cycle is repeated several times to complete the corrugation forming; Specifically, when the active shaft 391 moves downward, the meshing connection between the active spiral gear 392 and the active gear 396 drives the active rod 395 to rotate in the opposite direction. At this time, the active end face ratchet 397 located at one end of the active rod 395 rotates in the opposite direction synchronously, and the tooth shape of the active end face ratchet 397 and the driven end face ratchet 398 can only rotate in the positive direction. When the active end face ratchet 397 rotates in the opposite direction, the ratchet teeth of the active end face ratchet 397 will squeeze the driven end face ratchet 398, so that the driven end face ratchet 398 slides along the axial direction of the guide shaft 399. At this time, the driven rod 3911 will not rotate, and accordingly, the driven shaft 393 and the rotating table 35 will not rotate either. At this time, the split bulging fan plate 371 will only perform outward expansion movement; When the driving shaft 391 moves upward, the meshing connection between the driving helical gear 392 and the driving gear 396 drives the driving rod 395 to rotate forward. At this time, the cooperation between the driving end face ratchet 397 and the driven end face ratchet 398 can drive the driven rod 3911 to rotate forward synchronously. The driven gear 3912 on the driven rod 3911 is meshed with the driven threaded gear 394 on the driven shaft 393, which will drive the driven shaft 393 to rotate. The driven shaft 393 drives the corresponding outer gear 351 to rotate. The outer gear 351 is meshed with the outer gear ring 352. The outer gear ring 352 When rotating, it drives the rotating table 35 to rotate, thereby driving the multiple split expansion fan plates 371 above it to rotate synchronously, adjusting the angle of the fan plate, and then adjusting the angle of the fan plate when expanding outward, and when the active shaft 391 drives the conical extrusion column 38 to move upward, the fan plate will gradually not be squeezed, and the fan plate will reset inward under the action of the first spring 364. The outer wall of the fan plate is gradually separated from the inner wall of the tantalum liner 2. Therefore, the fan plate will not squeeze the wall of the tantalum liner 2 when rotating, and can avoid friction with the inner wall of the tube during rotation, so that the inner wall of the tantalum liner 2 after corrugation forming is smoother and the processing effect is better.

[0034] See also Figures 1 to 11 , a method for forming a tantalum bellows expansion joint, comprising the following steps: S1. Install the tantalum liner: S101, sleeve the tantalum liner 2 from top to bottom on the outside of the bulging mechanism 3 and place the bottom end of the liner on the lifting plate 41; S102, driving the inner ring clamping cylinder 53 and the outer ring clamping cylinder 52, so that the inner ring arc-shaped abutment plate 54 and the outer ring arc-shaped abutment plate 52 respectively abut against the inner and outer side walls of the bottom of the tantalum liner 2 from the inner and outer sides, and clamping and fixing the bottom end of the tantalum liner 2 on the lifting plate 41; S2, Tantalum liner bulging: S201, the driving cylinder 34 drives the driving shaft 391 to move downward and drives the conical extrusion column 38 to move downward synchronously, the side wall of the conical extrusion column 38 squeezes the split bulging fan plate 371 and makes it expand outward, and the multiple split bulging fan plates 371 expand outward synchronously and squeeze the inner wall of the tantalum liner 2, so that the wall of the liner expands outward and initially forms a corrugated bulge; S202, the driving cylinder 34 drives the driving shaft 391 to move upward and drives the conical extrusion column 38 to move upward synchronously. When the conical extrusion column 38 moves upward, the rotating table 35 is driven to rotate by the coordinated use of various components in the one-way transmission structure 39. The rotating table 35 drives the multiple split bulging fan plates 371 above it to rotate synchronously and adjust the angle of the fan plates for outward expansion processing; S203, repeating S201 and S202 until a complete corrugated protrusion is formed on the wall of the tantalum liner 2 at the current expansion position; S3, Tantalum bellows expansion joint integral forming: S301, adjusting the height of the tantalum liner 2, driving the lifting cylinder 42 to drive the tantalum liner 2 above it to move upward, and moving the unexpanded cylinder wall to one side of the expansion disk 37; S302, run S2; S303, repeating S301 and S302 until all positions to be processed on the wall of the tantalum liner 2 form complete corrugated protrusions, and the tantalum liner 2 expands into a bellows shape; S4. Remove the formed tantalum bellows expansion joint: S401, driving the lifting cylinder 42 to push the tantalum liner 2 above it upward; S402, reversely driving the inner ring clamping cylinder 53 and the outer ring clamping cylinder 52, so that the inner ring arc-shaped abutment plate 54 and the outer ring arc-shaped abutment plate 52 no longer abut against the inner and outer side walls of the tantalum liner 2; S403, taking out the tantalum liner 2 from the top to obtain a complete tantalum bellows expansion joint body (i.e., tantalum bellows).

[0035] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A forming device for a tantalum bellows expansion joint, characterized in that: The invention comprises a workbench (1), a tantalum liner (2), an expansion mechanism (3), a lifting mechanism (4) and a clamping mechanism (5), wherein the clamping mechanism (5) is arranged on the lifting mechanism (4), the tantalum liner (2) is sleeved on the expansion mechanism (3), and the bottom end of the tantalum liner (2) is clamped and fixed on the lifting mechanism (4) by the clamping mechanism (5), the expansion mechanism (3) is arranged above the workbench (1), and is used to squeeze the cylinder wall at the current corresponding position of the tantalum liner (2) and make the cylinder wall expand outward to form a corrugated protrusion, the lifting mechanism (4) is slidably arranged above the workbench (1) and corresponds to the outer side of the expansion mechanism (3), the lifting mechanism (4) is used to move the tantalum liner (2) up and down and cooperate with the expansion mechanism (3) to form a plurality of complete corrugated protrusions at all positions of the cylinder wall of the tantalum liner (2) to be processed.

2. The forming device of tantalum bellows expansion joint according to claim 1, characterized in that: The bulging mechanism (3) comprises a cylindrical casing (31), the top of the casing (31) is provided with an opening, and a sealing plate (32) is provided in the opening, a support platform (33) is fixed to the top of the casing (31) through the sealing plate (32), a rotating platform (35) is rotatably connected to the top of the support platform (33), a sliding platform (36) is fixed to the top of the rotating platform (35), a bulging disk (37) is slidably connected to the upper surface of the sliding platform (36), a conical extrusion column (38) is provided at the center above the bulging disk (37), the support platform (33), the rotating platform (35) are rotatably connected to the top of the support platform (33), a bulging disk (37) is slidably connected to the upper surface of the sliding platform (36), and a conical extrusion column (38) is provided at the center above the bulging disk (37). A through hole is provided on the inner wall of the turntable (35) and the sliding table (36) on a side corresponding to the conical extrusion column (38), and the conical extrusion column (38) slides through the through hole. A cylinder (34) is installed on a side corresponding to the conical extrusion column (38) inside the housing (31), and a one-way transmission structure (39) is provided at one end of the piston rod of the cylinder (34). The one-way transmission structure (39) is connected to the bottom end of the conical extrusion column (38), and the one-way transmission structure (39) is used to drive the turntable (35) to rotate in one direction when the conical extrusion column (38) moves upward.

3. The forming device of tantalum bellows expansion joint according to claim 2, characterized in that: An outer ring gear (352) is sleeved and fixed on the outside of the rotating platform (35), and a plurality of outer gears (351) are meshedly connected to the outer side of the outer ring gear (352). The plurality of outer gears (351) are rotatably connected to the top of the supporting platform (33) via a rotating shaft. The plurality of outer gears (351) cooperate with the outer ring gear (352) to keep the rotating platform (35) stable when rotating.

4. The forming device of tantalum bellows expansion joint according to claim 3, characterized in that: The one-way transmission structure (39) comprises a driving shaft (391), a driven shaft (393), a driving rod (395) and a driven rod (3911); the top end of the driving shaft (391) is connected and fixed to the bottom end of the conical extrusion column (38), and the bottom end of the driving shaft (391) is connected and fixed to the top end of the piston rod of the oil cylinder (34); the driven shaft (393) is rotatably connected in the housing (31), and the top end of the driven shaft (393) is connected and fixed to one end of the rotating shaft of the external gear (351) on the corresponding side; and driving screws are respectively sleeved and fixed on the shaft bodies of the driving shaft (391) and the driven shaft (393). The active rod (395) is rotatably connected to a side of the housing (31) corresponding to the active shaft (391), the active rod (395) is sleeved and fixed with a active gear (396), the active gear (396) is meshingly connected with the active helical gear (392), the driven rod (3911) is rotatably connected to a side of the housing (31) corresponding to the driven shaft (393), the driven rod (3911) is sleeved and fixed with a driven gear (3912), the driven gear (3912) is meshingly connected with the driven helical gear (394); The active rod (395) and the driven rod (3911) are arranged front and back oppositely. An active end face ratchet (397) is fixed to one end of the active rod (395) facing the driven rod (3911). A mounting plate (3914) is fixed to one end of the driven rod (3911) facing the active rod (395). A guide shaft (399) is fixed at the center of one side of the mounting plate (3914). A guide sleeve (3913) is slidably sleeved on the outside of the guide shaft (399). A driven end face ratchet (398) is sleeved and fixed on the outside of the guide sleeve (3913). The driven end face ratchet (398) is meshedly connected with the active end face ratchet (397). A second spring (3910) is sleeved on the shaft body of the guide shaft (399). Two ends of the second spring (3910) are respectively connected and fixed to the mounting plate (3914) and the driven end face ratchet (398).

5. The forming device of tantalum bellows expansion joint according to claim 1, characterized in that: The lifting mechanism (4) comprises a lifting plate (41) and a lifting cylinder (42); the lifting plate (41) is a disc-shaped structure, a through hole for accommodating the bulging mechanism (3) is provided at the center of its inner wall; the lifting cylinder (42) is embedded and installed in the workbench (1), and one end of the piston rod of the lifting cylinder (42) extends to the top of the workbench (1) and is connected and fixed to the lifting plate (41).

6. The forming device of tantalum bellows expansion joint according to claim 5, characterized in that: The clamping mechanism (5) comprises an inner ring clamping structure and an outer ring clamping structure, the inner ring clamping structure and the outer ring clamping structure are arranged correspondingly, and clamp the cylinder wall of the tantalum liner (2) from the inner and outer sides respectively, the inner ring clamping structure comprises a plurality of inner ring clamping cylinders (53), one end of the piston rod of the plurality of inner ring clamping cylinders (53) is fixed with an inner ring arc-shaped abutment plate (54), and the outer ring clamping structure comprises a plurality of outer ring clamping cylinders (51), one end of the piston rod of the plurality of outer ring clamping cylinders (51) is fixed with an inner ring arc-shaped abutment plate (54). An outer arc-shaped abutment plate (52) is fixed at each end, and a plurality of the inner arc-shaped abutment plates (54) and a plurality of the outer arc-shaped abutment plates (52) are arranged one by one and equidistantly around the upper surface of the lifting plate (41). A plurality of the inner ring clamping cylinders (53) cooperate with a plurality of the inner ring arc-shaped abutment plates (54) to abut the wall of the tantalum liner (2) from the inside, and a plurality of the outer ring clamping cylinders (51) cooperate with a plurality of the outer ring arc-shaped abutment plates (52) to abut the wall of the tantalum liner (2) from the outside.

7. The forming device of tantalum bellows expansion joint according to claim 2 or 4, characterized in that: A plurality of guide grooves (361) are formed around the upper surface of the sliding platform (36) at equal intervals, a guide rod (362) is fixed in each of the guide grooves (361), a guide block (363) is slidably sleeved on the rod body of each of the guide rods (362), and each of the guide blocks (363) is slidably connected in the corresponding guide grooves (361), a first spring (364) is sleeved on the rod body of each of the guide rods (362), and two ends of each of the first springs (364) are respectively connected and fixed to the corresponding guide block (363) and the inner wall of one side of the guide groove (361).

8. The forming device of tantalum bellows expansion joint according to claim 7, characterized in that: The bulging disk (37) comprises a plurality of split bulging fan plates (371), the plurality of split bulging fan plates (371) being arranged in one-to-one correspondence with the plurality of guide grooves (361), and the bottoms of the plurality of split bulging fan plates (371) are respectively connected and fixed to the guide blocks (363) on the corresponding side, the plurality of split bulging fan plates (371) surround the upper surface of the sliding table (36) and form a disc-shaped structure, and a hole for passing the conical extrusion column (38) is opened at the center thereof The plurality of split bulging fan plates (371) are respectively used in cooperation with the corresponding guide grooves (361), the guide blocks (363), the guide rods (362) and the first springs (364), so as to expand outwards when the conical extrusion column (38) moves downwards and contract inwards when the conical extrusion column (38) moves upwards; when the plurality of split bulging fan plates (371) contract inwards, they are synchronously rotated by the cooperation of the one-way transmission structure (39) and the rotating table (35).

9. A method for forming a tantalum bellows expansion joint, characterized in that: The method comprises the following steps: S1. Install the tantalum liner: S101, sleeve the tantalum liner (2) onto the outside of the bulging mechanism (3) from top to bottom and place the bottom end of the liner on the lifting plate (41); S102, driving the inner ring clamping cylinder (53) and the outer ring clamping cylinder (52), so that the inner ring arc-shaped abutment plate (54) and the outer ring arc-shaped abutment plate (52) respectively abut against the inner and outer side walls of the bottom of the tantalum liner (2) from the inner and outer sides, and clamping and fixing the bottom end of the tantalum liner (2) on the lifting plate (41); S2, Tantalum liner bulging: S201, the driving cylinder (34) drives the driving shaft (391) to move downward and drives the conical extrusion column (38) to move downward synchronously, the side wall of the conical extrusion column (38) squeezes the split bulging fan plate (371) and causes it to expand outward, and the multiple split bulging fan plates (371) simultaneously expand outward and squeeze the inner wall of the tantalum liner (2), so that the wall of the liner expands outward and initially forms a corrugated protrusion; S202, the driving cylinder (34) drives the driving shaft (391) to move upward and drives the conical extrusion column (38) to move upward synchronously. When the conical extrusion column (38) moves upward, the components in the one-way transmission structure (39) cooperate to drive the rotating table (35) to rotate. The rotating table (35) drives the multiple split bulging fan plates (371) above it to rotate synchronously and adjust the angle of the fan plates to expand outward. S203, repeating S201 and S202 until a complete corrugated protrusion is formed on the wall of the tantalum liner (2) at the current expansion position; S3, Tantalum bellows expansion joint integral forming: S301, adjusting the height of the tantalum liner (2), driving the lifting cylinder (42) to drive the tantalum liner (2) above it to move upward, and moving the unexpanded cylinder wall to one side of the expansion disk (37); S302, run S2; S303, repeating S301 and S302 until all positions to be processed on the wall of the tantalum liner (2) are completely formed with corrugated protrusions, and the tantalum liner (2) is expanded into a bellows shape; S4. Remove the formed tantalum bellows expansion joint: S401, driving the lifting cylinder (42) to push the tantalum liner (2) above it upward; S402, driving the inner ring clamping cylinder (53) and the outer ring clamping cylinder (52) in reverse direction, so that the inner ring arc-shaped abutment plate (54) and the outer ring arc-shaped abutment plate (52) no longer abut against the inner and outer side walls of the tantalum liner (2); S403, remove the tantalum liner (2) from the top to obtain a complete tantalum bellows expansion joint body.

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