A welding fixture for the circumferential and longitudinal weld joint assembly of the outer cylinder of a PDH device

Abstract

The present invention relates to a welding tooling for butt welding of circumferential and longitudinal welds of the outer network cylinder of a PDH device. A plurality of support ring assemblies are fixedly connected to the main shaft of the welding tooling, and the outer circumferences of the plurality of support ring assemblies are sequentially connected by main connecting rods. Both ends of the main shaft of the welding tooling are fixed on the shaft support assemblies. The welding tooling of the present invention has a reasonable structure, is easy to use, easy to disassemble, stable and durable, and is a welding tooling for butt welding of circumferential and longitudinal welds of the outer network cylinder of a PDH device with high precision; it can effectively solve problems such as butt welding, alignment and deformation control during welding of large-scale PHD outer network cylinders.

Description

Technical Field

[0001] The present invention mainly relates to a special welding tooling, in particular to a welding tooling suitable for the circumferential and longitudinal weld joint alignment welding of the outer net cylinder of the internal components of a PDH device petrochemical reactor, belonging to the welding tooling. Background Art

[0002] The number of large-scale oil refining projects is increasing day by day, and the quality accuracy requirements for the internal components of large-scale PDH devices are getting higher and higher. Since the internal components of the PDH device are relatively large in size, with a diameter of about 6 meters and a length of about 20 meters, it is necessary to carry out butt welding on the outer net cylinder of the large internal components. At present, most welding operations are carried out manually using simple tooling, resulting in low welding efficiency and difficult to guarantee the quality accuracy. In order to improve the welding quality and efficiency, the existing technology is exploring automatic welding and robotic laser deep penetration welding. However, it is difficult to control the alignment and roundness during the welding of large cylinders, as well as the deformation control during welding. At the same time, the welding operation viewing angle range of the welding robot is small, and it is difficult to carry out all-round welding of the circumferential and longitudinal seams of large cylinders. There is no suitable special tooling to ensure the welding quality, which seriously restricts the production efficiency. Summary of the Invention

[0003] Object of the Invention:

[0004] The present invention provides a welding tooling suitable for the circumferential and longitudinal weld joint alignment welding of the outer net cylinder of a PDH device, aiming to solve the problems that the existing tooling cannot control the deformation of large cylinders, cannot carry out alignment and roundness during welding, resulting in low welding quality and efficiency.

[0005] Technical Solution:

[0006] A welding tooling suitable for the circumferential and longitudinal weld joint alignment welding of the outer net cylinder of a PDH device, wherein a plurality of support ring assemblies are fixedly connected to the main shaft of the welding tooling, the outer circumferences of the plurality of support ring assemblies are sequentially connected by main connecting rods, and both ends of the main shaft of the welding tooling are fixed on the shaft support assemblies.

[0007] The support ring assembly is composed of a support ring outer ring, a support ring inner ring and support ring struts. The support ring inner ring and the support ring outer ring are fixedly connected at equal arc intervals by the support ring struts;

[0008] The support ring outer ring includes a support ring left outer ring and a support ring right outer ring. The support ring left outer ring and the support ring right outer ring are snap-connected. The arc edges of the support ring left outer ring and the support ring right outer ring are provided with through rod holes at equal arc intervals, and the main connecting rods sequentially pass through the through rod holes to connect a plurality of support ring assemblies;

[0009] The support ring inner ring includes a support ring left inner ring and a support ring right inner ring. The support ring left inner ring and the support ring right inner ring are of the same symmetric arc segment structure, and the support ring left inner ring and the support ring right inner ring are butted.

[0010] The left outer ring and the right outer ring of the support ring are misaligned arc segments.

[0011] At both ends of the arc segment of the left outer ring of the support ring, there is a convex snap respectively, and at both ends of the arc segment of the right outer ring of the support ring, there is a concave snap respectively. The convex snap and the concave snap at the corresponding ends are snap-connected.

[0012] The shaft support assembly includes a shaft support rod, a bottom plate and a first roller body. The shaft support rod is fixed on the bottom plate. The first roller body is fixedly connected to the shaft support rod through two front and rear support brackets. The main shaft is connected inside the first roller body. The first roller body includes a first upper roller and a first lower roller. The first upper roller and the first lower roller are semi-circular roller bodies with the same structure and embedded with ball bearings. The first upper roller and the first lower roller are fixedly connected.

[0013] The shaft support assembly is further provided with a left main stay of the diagonal stay, a right main stay of the diagonal stay, a left sub-stay of the diagonal stay and a right sub-stay of the diagonal stay. One end of each of the left main stay of the diagonal stay, the right main stay of the diagonal stay, the left sub-stay of the diagonal stay and the right sub-stay of the diagonal stay is connected to the shaft support rod, and the other end is connected to the bottom plate. The left main stay of the diagonal stay and the right main stay of the diagonal stay are symmetrically arranged on both sides of the shaft support rod with the shaft support rod as the axis of symmetry. The left sub-stay of the diagonal stay and the right sub-stay of the diagonal stay are also symmetrically arranged on both sides of the shaft support rod with the shaft support rod as the axis of symmetry.

[0014] The shaft support rod is composed of multiple sections of H-shaped steel sequentially through shaft support connection plates.

[0015] A plurality of support ring assemblies are fixedly connected to the main shaft through a connection assembly. The connection assembly includes a support ring bushing connection ring and a second roller body. The support ring bushing connection ring is welded around the center ring part of the second roller body. The support ring bushing connection ring is fixedly connected to the inner ring of the support ring of the support ring assembly. The second roller body includes a second upper roller and a second lower roller. The second upper roller and the second lower roller are semi-circular roller bodies with the same structure and embedded with ball bearings. The second upper roller and the second lower roller are fixedly connected.

[0016] The first upper roller and the second upper roller, the first lower roller and the second lower roller are all structures in which a semi-cylindrical stainless steel body is machined with L-shaped grooves along the two inner arc edges. There are blocking ridges along the inner edge of the L-shaped groove, and the ball bearings can just be placed in the L-shaped groove.

[0017] Limiters are provided at the front and rear of the first roller body and the second roller body. The limiter is composed of an upper limiter and a lower limiter with the same structure. The upper limiter and the lower limiter are fixedly connected. The inner circle radius formed by the upper limiter and the lower limiter is the same as the outer circle radius of the main shaft.

[0018] Advantages and effects:

[0019] The present invention provides a butt welding tooling for circumferential and longitudinal welds of the outer cylinder of a PDH device, aiming to develop a butt welding tooling for circumferential and longitudinal welds of the outer cylinder of a PDH device with reasonable structure, simple use, easy disassembly, stable durability and high precision; it can effectively solve problems such as butt joint, alignment and deformation control during welding of the large PHD outer cylinder, solve the problem of small view angle range of the manipulator welding operation during laser automatic welding, simplify the production process of welding the mesh pieces into an integral part, realize the all-round welding of the circumferential and longitudinal seams of the large PDH outer cylinder, while ensuring the welding quality, greatly improving the welding production efficiency of the cylinder, and further improving the enterprise and social economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the front view of the butt welding tooling of the present invention;

[0021] Figure 2 is the side view of the butt welding tooling of the present invention;

[0022] Figure 3 is the partial enlarged view of the butt welding tooling I of the present invention;

[0023] Figure 4 is the partial enlarged view of the butt welding tooling II of the present invention;

[0024] Figure 5 is the partial enlarged view of the butt welding tooling III of the present invention;

[0025] Figure 6 is the schematic diagram of the support ring assembly of the butt welding tooling of the present invention;

[0026] Figure 7 is the schematic diagram of the shaft support assembly of the butt welding tooling of the present invention;

[0027] Figure 8 is the side view of the shaft support assembly of the butt welding tooling of the present invention;

[0028] Figure 9 is the schematic diagram of the shaft support assembly A-A and B-B of the butt welding tooling of the present invention;

[0029] Figure 10 is the schematic diagram of the connection assembly of the butt welding tooling of the present invention;

[0030] Figure 11 is the cross-sectional view of the connection assembly of the butt welding tooling of the present invention;

[0031] Figure 12 is the schematic diagram of the stopper of the butt welding tooling of the present invention;

[0032] Reference Numerals: 1 Support Ring Assembly, 1-1 Left Outer Ring of Support Ring, 1-2 Right Outer Ring of Support Ring, 1-3 Left Inner Ring of Support Ring, 1-4 Right Inner Ring of Support Ring, 1-5 Support Rod of Support Ring, 1-6 Convex Snap, 1-7 Concave Snap, 1-8 Rod Passing Hole, 1-9 Equi-spaced Bolt Holes, 2 Shaft Bracket Assembly, 2-1 Left Main Support Rod of Diagonal Tension Rib, 2-2 Right Main Support Rod of Diagonal Tension Rib, 2-3 Left Sub-support Rod of Diagonal Tension Rib, 2-4 Right Sub-support Rod of Diagonal Tension Rib, 2-5 Shaft Support Rod, 2-6 Base Plate, 2-7 Support Bracket Plate, 2-8 First Upper Roller, 2-9 First Lower Roller, 2-10 Roller Connection Plate, 2-11 Connection Plate of Sub-support Rod of Diagonal Tension Rib, 2-12 Shaft Bracket Connection Plate, 2-13 First Bolt Hole, 2-14 Connection Block, 2-15 Padding Plate, 2-16 Traveling Wheel Connection Plate, 2-17 First Roller Bolt Hole, 2-18 Bolt Hole of Roller Connection Plate, 2-19 Ball, 2-20 Traveling Wheel, 2-21 L-shaped Groove, 2-22 First Roller Body, 3 Connection Assembly, 3-1 Support Ring Sleeve Connection Ring, 3-2 Second Upper Roller, 3-3 Second Lower Roller, 3-4 Second Roller Bolt Hole, 3-5 Blocking Ridge, 3-6 Second Roller Body, 4 Main Shaft, 5 Main Connecting Rod, 6 Limiter, 6-1 Upper Limit, 6-2 Lower Limit, 6-3 Inner Nut, 6-4 Outer Nut. Detailed Embodiment

[0033] The present invention will be further described below with reference to the accompanying drawings:

[0034] As Figure 1-2 shown, the present invention provides a welding fixture applicable to the circumferential and longitudinal weld joint alignment welding of the outer network cylinder of a PDH device: The welding fixture includes a support ring assembly 1, a shaft bracket assembly 2, a connection assembly 3, a main shaft 4, and a main connecting rod 5. A plurality of support ring assemblies 1 are fixedly connected to the main shaft 4 of the welding fixture. The plurality of support ring assemblies 1 make the coaxiality and cylindricity of the assembled network cylinder more accurate. The outer circumferences of the plurality of support ring assemblies 1 are sequentially connected by the main connecting rod 5. The two ends of the main shaft 4 of the welding fixture are fixed on the shaft bracket assembly 2. In this embodiment, there is a shaft bracket assembly 2 at each of the front and rear ends of the main shaft 4 of the welding fixture, passing through seven support ring assemblies 1. Twelve main connecting rods 5 pass through the rod passing holes 1-8 on the seven support ring assemblies 1. The number of each component can be adjusted according to requirements.

[0035] As Figure 6 shown, the support ring assembly 1 is composed of an outer support ring, an inner support ring, and a support rod 1-5 of the support ring. The inner support ring and the outer support ring are fixedly connected at equal intervals by eight support rods 1-5 of the support ring; Since this device is applied to large equipment, the support rod 1-5 of the support ring can enhance the support strength of the support ring assembly 1.

[0036] The outer ring of the support ring includes the left outer ring 1-1 and the right outer ring 1-2 of the support ring. The left outer ring 1-1 and the right outer ring 1-2 of the support ring are misaligned arc segment structures, and there are through-rod holes 1-8 with equal arc distances on the arc edges. At both ends of the arc segment of the left outer ring 1-1 of the support ring, there is a convex buckle 1-6 respectively. At both ends of the arc segment of the right outer ring 1-2 of the support ring, there is a concave buckle 1-7 respectively. The convex buckle 1-6 and the concave buckle 1-7 at adjacent ends are clamped tightly to form the overall structure of the outer ring of the support ring. The inner ring of the support ring includes the left inner ring 1-3 and the right inner ring 1-4 of the support ring. The left inner ring 1-3 and the right inner ring 1-4 of the support ring are the same symmetric arc segment structures, and there are bolt holes 1-9 with equal radian on them.

[0037] As Figure 3-4 shown in Figures 7-8, the first upper roller 2-8 and the first lower roller 2-9 of the shaft support assembly 2 are semi-circular roller bodies with the same structure and internally embedded with balls 2-19. At the outer sides of both ends of the first upper roller 2-8 and the first lower roller 2-9, there are roller connecting plates 2-10 welded. There are roller connecting plate bolt holes 2-18 on the roller connecting plates 2-10. The first upper roller 2-8 and the first lower roller 2-9 are combined into a roller body by a bolt group. The first lower roller 2-9 is supported by two front and rear support brackets 2-7 and a shaft support rod 2-5. The shaft support rod 2-5 is an H-shaped steel. The two support brackets 2-7 are welded to the H-shaped outer surface of the shaft support rod. The width of the support bracket 2-7 is greater than the width of the shaft support rod 2-5. Since the device is relatively large, in order to increase the force-bearing area of the main shaft 4 and then transfer it to the shaft support rod 2-5. Four pairs of diagonal bracing sub-support rod connecting plates 2-11 are parallel to each other in pairs and are welded to the H-shaped inner surface of the shaft support rod. The upper end surfaces of them are flush with the lower end surfaces of the support brackets 2-7. At the outer ends of the diagonal bracing sub-support rod connecting plates 2-11, there are first bolt holes 2-13, which have the same size as the bolt holes at the upper ends of the two left diagonal bracing sub-support rods 2-3 and the two right diagonal bracing sub-support rods 2-4. The upper ends of the four diagonal bracing sub-support rods can be fixed by a bolt group, and the lower ends with bolt holes are fixed on the connecting block 2-14 of the bottom plate 2-6 through a bolt group. The upper ends of the left main diagonal bracing rod 2-1 and the right main diagonal bracing rod 2-2 are welded to the H-shaped inner surface of the shaft support rod 2-5, and the lower ends are welded to the middle positions of the left and right square steels of the bottom plate 2-6. As Figure 9 shown in Figure 7, the bottom plate 2-6 is welded by six square steels in a "field" shape. There is a backing plate 2-15 welded at the middle position above. The bottom of the shaft support rod 2-5 is welded to the backing plate 2-15. At the four corners of the bottom of the bottom plate 2-6, there are traveling wheel connecting plates 2-16 welded. Traveling wheels 2-20 are installed below the traveling wheel connecting plates 2-16.

[0038] The shaft support rod 2-5 is composed of three sections of H-shaped steel and four shaft support connecting plates 2-12. On the two contact surfaces in the vertical direction of the three sections of H-shaped steel, that is, the four end faces, one shaft support connecting plate 2-12 is welded to each. The edge parts of the four shaft support connecting plates are provided with bolt holes of the same size, and the three sections of H-shaped steel are connected and fixed by a bolt group to form the shaft support rod 2-5. The height of the shaft support rod 2-5 can be adjusted according to requirements.

[0039] As Figure 5 , 10 and shown in 11, the connecting component 3 includes a support ring bushing connecting ring 3-1 and a second roller body 3-6. The support ring bushing connecting ring 3-1 is welded around the outer peripheral part of the central ring of the second roller body 3-6. The support ring bushing connecting ring 3-1 is fixedly connected to the inner ring of the support ring component 1 through the second roller bolt holes 3-4.

[0040] The second roller body 3-6 of the connecting component 3 has the same structure as the first upper roller 2-8 and the first lower roller 2-9 in the shaft support component 2, and its thickness is about half of the latter. The support ring bushing connecting ring 3-1 can be welded around the central ring formed by the second upper roller 3-2 and the second lower roller 3-3. It has equally spaced arcs and second bolt holes 3-4 of the same size as the equally spaced bolt holes 1-9 of the support ring component 1, and can be fixedly connected to the support ring component through a bolt group of the same model number.

[0041] As Figure 8 and 11 shown, the first upper roller 2-8 and the second upper roller 3-2, the first lower roller 2-9 and the second lower roller 3-3 are structures in which a semi-cylindrical stainless steel body is machined with L-shaped grooves 2-21 along the two inner arc edges. There are blocking ribs 3-5 along the inner edge of the L-shaped groove, and the L-shaped groove 2-21 is just right for placing the ball 2-19, and the ball 2-19 can roll inside and will not fall out.

[0042] As Figure 4-5 and shown in 12, for the first roller body 2-22 and the second roller body 3-6 of this welding tooling, there is a stopper 6 at the front and back. The stoppers 6 arranged at the front and back of the second roller body 3-6 are used to lock the support ring component 1, and the stoppers 6 arranged at the front and back of the first roller body 2-22 are used to lock the shaft support component 2. The stopper 6 is composed of an upper stopper 6-1 and a lower stopper 6-2 with the same structure, and the inner circle radius thereof is the same as the outer circle radius of the main shaft 4. Both the upper stopper 6-1 and the lower stopper 6-2 are formed by welding a nut 6-4 at the 45° and 135° positions between two overlapping semi-circular stainless steel sheets. Nuts 6-4 are welded to the outer circles at both ends of the upper stopper 6-2 and the lower stopper 6-3 respectively, for combining the stopper.

[0043] The structure of the present invention is reasonable, facilitating mechanical manufacturing, assembly and disassembly, and having low production costs.

[0044] The present invention is combined with an assembly jig. The prefabricated segmented mesh sheets are fixed to the welding jig with special tooling fixtures. During the fastening process, if there is a gap between the mesh sheet and the outer circle of the support ring of the jig, the arc of the mesh sheet is adjusted (for the welding fixation and deformation control of the cylinder to be welded), so that the coaxiality and cylindricity of the assembled mesh cylinder are more accurate, realizing the efficient and relatively accurate overall assembly welding cooperation of the cylinder; the production efficiency can be greatly improved;

[0045] Due to the adoption of this jig, the internal components in the PDH device can be integrally assembled, calibrated, and circumferentially and longitudinally welded, which can reduce or eliminate the offset error between the circumferential welds of the cylinder sections, improve the welding accuracy, is easy to operate, and can reduce the welding cost; at the same time, it plays a role in expanding the diameter of the cylinder, especially the thin-walled mesh cylinder.

Claims

1. A welding fixture for the circumferential and longitudinal weld joint assembly of the outer cylinder of a PDH device, characterized in that: A plurality of support ring assemblies (1) are fixedly connected to the main shaft (4) of the welding tooling. The outer circumferences of the plurality of support ring assemblies (1) are sequentially connected by main connecting rods (5). Both ends of the main shaft (4) of the welding tooling are fixed on the shaft support assembly (2); A plurality of support ring assemblies (1) are fixedly connected to the main shaft (4) through a connecting assembly (3). The connecting assembly (3) includes a support ring bushing connecting ring (3-1) and a second roller body (3-6); The support ring assembly (1) is composed of a support ring outer ring, a support ring inner ring, and support ring struts (1-5). The support ring outer ring includes a support ring left outer ring (1-1) and a support ring right outer ring (1-2). The arc edges of the support ring left outer ring (1-1) and the support ring right outer ring (1-2) are provided with through-hole rods (1-8) at equal arc distances. The main connecting rod (5) sequentially passes through the through-hole rods (1-8) to connect the plurality of support ring assemblies (1); The shaft support assembly includes a shaft support rod (2-5), a bottom plate (2-6), and a first roller body (2-22). The shaft support rod (2-5) is fixed on the bottom plate (2-6). The first roller body (2-22) is fixedly connected to the shaft support rod (2-5) through two front and rear support brackets (2-7). The main shaft (4) is connected inside the first roller body; The first roller body (2-22) includes a first upper roller (2-8) and a first lower roller (2-9). The first upper roller (2-8) and the first lower roller (2-9) are semi-circular roller bodies with the same structure and internally embedded with ball bearings (2-19). The first upper roller (2-8) and the first lower roller (2-9) are fixedly connected. Roller connecting plates (2-10) are welded to the outer sides of both ends of the first upper roller (2-8) and the first lower roller (2-9). There are roller connecting plate bolt holes (2-18) on the roller connecting plates (2-10). The first upper roller (2-8) and the first lower roller (2-9) are combined into a roller body by a bolt group; The shaft support assembly is further provided with a left main stay cable support rod (2-1), a right main stay cable support rod (2-2), a left auxiliary stay cable support rod (2-3), and a right auxiliary stay cable support rod (2-4); One end of each of the left main stay cable support rod (2-1), the right main stay cable support rod (2-2), the left auxiliary stay cable support rod (2-3), and the right auxiliary stay cable support rod (2-4) is connected to the shaft support rod (2-5), and the other end is connected to the bottom plate (2-6); The left main stay cable support rod (2-1) and the right main stay cable support rod (2-2) are symmetrically arranged on both sides of the shaft support rod (2-5) with the shaft support rod (2-5) as the axis of symmetry. The left auxiliary stay cable support rod (2-3) and the right auxiliary stay cable support rod (2-4) are also symmetrically arranged on both sides of the shaft support rod (2-5) with the shaft support rod (2-5) as the axis of symmetry.

2. The circumferential and longitudinal weld joint alignment and welding tooling for the outer cylinder of the PDH device according to claim 1, wherein: The support ring inner ring and the support ring outer ring are fixedly connected at equal arcs through support ring struts (1-5); The left outer ring (1-1) of the support ring and the right outer ring (1-2) of the support ring are snap-connected. The inner ring of the support ring includes the left inner ring (1-3) and the right inner ring (1-4) of the support ring. The left inner ring (1-3) and the right inner ring (1-4) of the support ring are of the same symmetric arc segment structure, and the left inner ring (1-3) and the right inner ring (1-4) of the support ring are butted.

3. The circumferential and longitudinal weld joint alignment and welding tooling for the outer cylinder of the PDH device according to claim 2, characterized in that: The left outer ring (1-1) and the right outer ring (1-2) of the support ring are of a staggered arc segment structure.

4. The circumferential and longitudinal weld butt welding tooling for the outer cylinder of the PDH device according to claim 2, characterized in that: At each end of the arc segment of the left outer ring (1-1) of the support ring, there is a convex snap (1-6). At each end of the arc segment of the right outer ring (1-2) of the support ring, there is a concave snap (1-7). The convex snap (1-6) and the concave snap (1-7) at the corresponding ends are snap-connected.

5. The circumferential and longitudinal weld joint alignment and welding tooling for the outer cylinder of the PDH device according to claim 1, characterized in that: The shaft support rod (2-5) is composed of multiple sections of H-shaped steel through the shaft support connecting plate (2-12) in sequence.

6. The circumferential and longitudinal weld joint alignment and welding tooling for the outer cylinder of the PDH device according to claim 1, characterized in that: The support ring bushing connecting ring (3-1) is welded around the center ring of the second roller body (3-6). The support ring bushing connecting ring (3-1) is fixedly connected to the inner ring of the support ring of the support ring assembly (1). The second roller body (3-6) includes the second upper roller (3-2) and the second lower roller (3-3). The second upper roller (3-2) and the second lower roller (3-3) are semi-circular roller bodies with the same structure and with ball bearings (2-19) embedded inside. The second upper roller (3-2) and the second lower roller (3-3) are fixedly connected.

7. The welding tooling for butt welding of circumferential and longitudinal welds of the outer network cylinder of a PDH device according to claim 1 or 6, characterized in that: The first upper roller (2-8) and the second upper roller (3-2), the first lower roller (2-9) and the second lower roller (3-3) are all structured by turning L-shaped grooves (2-21) along the two inner arc edges of a semi-cylindrical stainless steel body. There are blocking ribs (3-5) along the inner edge of the L-shaped groove (2-21), and the ball bearings (2-19) just fit into the L-shaped groove (2-21).

8. The welding fixture for circumferential and longitudinal welds of the outer cylinder applicable to the PDH device according to claim 1 or 6, characterized in that: Limiters (6) are provided at the front and back of the first roller body and the second roller body. The limiter is composed of an upper limiter (6-1) and a lower limiter (6-2) with the same structure. The upper limiter (6-1) and the lower limiter (6-2) are fixedly connected. The inner circle radius formed by the upper limiter (6-1) and the lower limiter (6-2) is the same as the outer circle radius of the main shaft (4).

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