CN217254067U - A kind of elbow welding fixing device and pipe fitting processing device - Google Patents

Abstract

The utility model belongs to the technical field of pipe fitting processing, and discloses an elbow welding and fixing device and a pipe fitting processing device, which comprises a first fixing component and a second fixing component, wherein two first fixing components are arranged at intervals in the circumferential direction around the rotation center of a rotating disc, the first fixing component is used for fixing a straight pipe, the second fixing component is arranged at the rotation center of a base, the second fixing component is used for fixing an elbow, the two straight pipe sections can be driven by the two first fixing components to rotate in the circumferential direction around the rotation center, the elbow is fixed at the rotation center through the second fixing component, and the angle between the straight line sections of the two pipe fittings can be adjusted through the relative rotation of the two first fixing components along with the different angles of the elbow to be welded so as to adapt to the welding of elbows with different angles, thereby solving the technical problem that the elbow welding device in the prior art can not adapt to the welding requirements of elbows with various angles, the work efficiency and the welding quality of elbow welding are improved.

Description

A kind of elbow welding fixing device and pipe fitting processing device

technical field

The utility model relates to the technical field of pipe fittings processing, in particular to an elbow welding fixing device and a pipe fitting processing device.

Background technique

Pipe fittings are the parts in the pipeline system that play the roles of connection, control, direction change, diversion, sealing, support, etc., and are widely used in various fields of life. In order to change the direction of the pipeline, it is often necessary to bend the pipe fittings to realize the connection at the bend of the pipeline.

Existing pipe bending machines are generally suitable for the bending of pipes with larger outer diameters. When processing parts with smaller outer diameters and wall thicknesses, cracking and deformation are prone to occur, resulting in scrapped parts. Therefore, such parts are usually bent. Head welding process. The elbow welding process refers to changing the direction of the pipeline by welding the elbow between two straight pipe sections with different directions. In the welding process, in order to avoid potential safety hazards caused by bending, twisting and dislocation of the welded parts, it is necessary to fix the elbow and the straight pipe fittings.

The elbow welding fixing device in the prior art is generally provided with a workbench connected with the welding machine, and a support frame is provided on the workbench, which can place the elbow and the straight pipe section at a position suitable for welding. The elbow and the straight section are pressed onto the support frame by the splint with the arc groove, and fixed by screwing the bolts. After the welding of the elbow and the straight pipe section is completed, loosen the bolts on the splint and remove the splint to remove the welded pipe fittings.

Although the existing elbow welding fixing device can realize the fixing of straight pipe sections and elbows, in actual production, the elbows used for butt welding often have various angles, such as 45° elbow, 135° elbow and 90° elbow, etc. Due to the structural limitations of the support frame and the splint, the existing elbow welding device can only be applied to one type of elbow welding with a set angle. For the butt welding of elbows of different angles, the existing elbow welding device does not have universality, which makes the universality of the elbow welding fixing device lower and the use cost higher.

Utility model content

One aspect of the present invention is to provide an elbow welding fixing device and a pipe fitting processing device, which are suitable for the welding requirements of elbows with different angles and improve the flexibility of welding.

For this purpose, the utility model adopts the following technical solutions:

An elbow welding and fixing device is used for fixing an elbow and two straight pipe sections to be welded on both ends of the elbow, and the elbow welding and fixing device comprises:

a first fixing assembly, the two first fixing assemblies can rotate relative to each other in the circumferential direction around the rotation center, and the two first fixing assemblies are respectively used for fixing the two straight pipe sections;

A second fixing component is installed at the rotation center, and the second fixing component is used for fixing the elbow.

Optionally, the elbow welding fixture also includes:

a base having a first support surface;

a rotating disk, which is rotatably connected with the base, the rotating disk has a second support surface, the first support surface and the second support surface are coplanar, and the first support surface and the second support surface Both are provided with the first fixing component.

Optionally, the first fixing component includes a baffle plate and a clamping unit, the clamping unit and the baffle plate are arranged opposite to and spaced apart to cooperate to clamp the straight pipe section, and the clamping unit is connected to the baffle plate. The spacing between the baffles can be adjusted;

And/or, the second fixing assembly includes a positioning column and a pressing member that are oppositely and spaced apart, the positioning column is mounted on the base, and the pressing member cooperates with the positioning column to clamp the bending member. The distance between the pressing member and the positioning post can be adjusted.

Through the above solution, the baffle and the clamping unit cooperate to clamp and fix the straight pipe section, and the positioning column and the pressing member cooperate to clamp the elbow. and the distance between the pressing piece and the positioning column to meet the needs of clamping elbows and straight pipe sections of various diameters.

Optionally, the second fixing assembly further includes a connecting rod and a locking nut, one end of the connecting rod is connected with the pressing member, and the other end of the connecting rod is slidably connected with the positioning column, so that the The pressing member is close to or away from the positioning post, and the locking nut is screwed on the connecting rod and abuts against the side of the positioning post away from the pressing member.

And/or, the clamping unit includes a fixing plate and an adjusting bolt, the fixing plate is opposite to the baffle and is arranged at intervals, the adjusting bolt is screwed on the fixing plate, and the adjusting bolt is An end protrudes between the fixing plate and the baffle to abut the straight pipe section. Through the above solution, the connecting rod can be used to slide in the positioning column, so that the pressing member is close to or away from the positioning column, so as to realize the adjustment of the distance between the pressing member and the positioning column, adapt to the elbows of different diameters, and tighten the lock nut. The connecting rod can drive the pressing piece, so that the pressing piece and the positioning column clamp the elbow, use the adjusting bolt to abut the straight pipe section, and fix the straight pipe section between the fixing plate and the baffle, and then screw the adjusting nut. The distance between the adjustment nut and the baffle can be adjusted to use straight pipe sections of different diameters.

Optionally, the rotating disk is rotatably sleeved on the positioning column, and the axis of the positioning column is the rotation axis of the rotating disk.

Optionally, the positioning column is rotatably connected to the base, and the rotation axis of the positioning column is collinear with the rotation axis of the rotating disk.

Through the above solution, the positioning column can be used as a rotating shaft to connect the base and the rotating plate, and the rotating plate can be sleeved on the positioning column and rotate at the axis position of the positioning column, driving the first fixed component on the rotating plate to rotate, and adjusting the two sets of first fixed components. Fix the angle between components to accommodate welding of elbows with different angles.

Optionally, an arc-shaped groove is formed on the rotating disk, the center of the arc-shaped groove is located on the rotation axis of the rotating disk, and the base is provided with a threaded hole that is in direct communication with the arc-shaped groove. , the rotating disk and the base are fastened by the locking bolts passing through the threaded holes and the arc-shaped grooves;

And/or, an angle scale is provided on the rotary disk or the base, and the angle scale is used to indicate the rotation angle of the rotary disk.

Through the above solution, the locking bolt can be threadedly connected with the threaded hole on the base to press and fix the rotating disk. The rotating disk is provided with an arc-shaped groove whose center is the rotation axis of the rotating disk, so that the locking bolt can be inserted into the arc-shaped groove. When the rotating disk needs to be rotated to adjust the angle of the first fixed component on the rotating disk, the locking bolt can be loosened, and the rotating disk can be rotated to realize the adjustment of the angle of the first fixed component.

Optionally, the base includes a bottom plate portion and a boss portion protruding from the bottom plate portion, a surface of the boss portion away from the bottom plate portion forms the first support surface, and the rotary disk is rotatably installed. on the bottom plate.

Through the above solution, the rotating disc is installed on the bottom plate, so that the second supporting surface on the rotating disc and the first supporting surface on the boss part are on the same level, so as to ensure that the two straight pipe fittings used for welding and the bending The heads are fixed on the same level.

Optionally, the boss portion and the rotating disk are concentric fan-shaped structures, and the sum of the central angle corresponding to the boss portion and the central angle corresponding to the rotating disk is less than 360°.

Through the above solution, the boss portion and the rotating disk are concentric fan-shaped structures, and the two sides of the boss portion can realize the rotation limit of the rotation of both sides of the rotating disk.

According to another aspect of the present invention, the pipe fitting processing device provided by the present invention includes the above-mentioned elbow welding and fixing device.

The beneficial effects of the utility model: the elbow welding fixing device and the pipe fitting processing device provided by the present utility model, by fixing the two straight pipe sections on the two first fixing components respectively, the two first fixing components drive the two straight pipe sections Can rotate relative to each other circumferentially around the rotation center, and the elbow is fixed at the rotation center by the second fixing component. As the angle of the elbow to be welded is different, the relative rotation of the two first fixing components can be used to adjust the two pipe fittings The angle between the straight line segments is suitable for elbow welding of different angles, which solves the technical problem that the elbow welding device in the prior art cannot adapt to the welding requirements of elbows with various angles, and improves the work efficiency of elbow welding. Welding quality.

Description of drawings

1 is a schematic diagram of the matching structure of the elbow welding fixing device provided by the present utility model, an elbow and a straight pipe section;

Fig. 2 is the structural schematic diagram of the elbow welding fixing device provided by the present invention;

3 is a schematic structural diagram of the elbow welding fixing device provided by the present invention when the first fixing component is removed.

In the figure: 100, base; 110, threaded hole; 120, bottom plate part; 130, boss part; 200, rotary disk; 210, arc groove; 220, locking bolt; 300, first fixing component; 310, stopper 320, clamping unit; 321, fixing plate; 322, adjusting bolt; 400, second fixing component; 410, positioning column; 420, pressing piece; 430, connecting rod; 440, locking nut.

Detailed ways

The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or a fixed connection. It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be an internal connection between two elements or an interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features The features are not in direct contact but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which are only for convenience of description and simplified operation, rather than indicating Or imply that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for distinction in description, and have no special meaning.

The utility model provides an elbow welding fixing device and a pipe fitting processing device, which are mainly used to realize the fixing of the elbow and the straight pipe section in the elbow butt welding operation process. When welding elbows, in order to prevent bending, offset or dislocation of the straight pipe section of the elbow and butt welding, resulting in bending and torsion deformation, stress concentration and even desoldering of the welded parts after welding, it is necessary to carry out welding Elbow and straight pipe sections are clamped and fixed.

Fig. 1 is the structural representation of the fitting structure of the elbow welding fixing device provided by the utility model and the elbow and the straight pipe section, Fig. 3 is the structural schematic diagram of the elbow welding fixing device provided by the utility model when the first fixing component is removed, such as As shown in FIG. 1 and FIG. 3 , the elbow welding and fixing device provided by the present invention includes a first fixing assembly 300 . The two first fixing assemblies 300 can rotate relative to each other in the circumferential direction around the rotation center. They are respectively used for fixing two straight pipe sections; the second fixing component 400 is installed at the rotation center, and the second fixing component 400 is used for fixing the elbow.

Further, the elbow welding device provided by the present invention further includes a base 100 and a rotating disk 200, the base 100 has a first supporting surface, the rotating disk 200 is rotatably connected with the base 100, the rotating disk 200 has a second supporting surface, the first supporting surface The surface and the second supporting surface are coplanar, and both the first supporting surface and the second supporting surface are provided with the first fixing component 300 .

Specifically, each of the first support surface and the second support surface is provided with a first fixing component 300, and the first fixing component 300 can fix the straight pipe section to be welded. Between the two first fixing assemblies 300, that is, at the rotation center of the rotating disk 200, a second fixing assembly 400 is installed, and the second fixing assembly 400 can fix the elbow. The two first fixing components 300 are circumferentially spaced around the rotation center, so that the to-be-welded ends of the fixed two straight pipe sections are abutted against both ends of the bent pipe, and the fixing before welding is completed. The first fixing component 300 installed on the rotating disk 200 can rotate on the base plate 100 with the rotating disk 200 to adjust the angle between itself and the other first fixing component 300 so as to be able to connect with elbows with different bending angles.

In the elbow welding fixing device and the pipe fitting processing device provided by the present invention, by fixing the two straight pipe sections on the two first fixing components 300 respectively, the two first fixing components 300 can drive the two straight pipe sections to be able to mutually rotate around the center of rotation. Rotating relative to the circumferential direction, the elbow is fixed at the center of rotation by the second fixing component 400. As the angle of the elbow to be welded is different, the relative rotation of the two first fixing components 300 can be used to adjust the distance between the straight sections of the two pipe fittings. The angle between different angles is suitable for elbow welding of different angles, which solves the technical problem that the elbow welding device in the prior art cannot adapt to the welding requirements of elbows of various angles, and improves the work efficiency and welding quality of elbow welding.

After determining the angle of the elbow to be welded, rotate the rotating disk 200 so that the angle between the first fixing component 300 on the rotating disk 200 and the first fixing component 300 on the bottom plate 100 is consistent with the angle of the elbow, The head is fixed on the second fixing assembly 400, and then the two straight pipe sections to be welded are respectively fixed on the first fixing assembly 300, so that the two straight pipe sections are respectively abutted with both ends of the elbow, and the elbow before welding is completed. and the fixing of straight pipe sections.

That is, in the elbow welding and fixing device provided in this embodiment, the rotatable rotating disk 200 is provided on the base 100, and the two first fixing components 300 for fixing the straight pipe section are installed on the rotating disk 200 and the base 100, and the bending The head is installed on the rotation center of the rotating disk 200 through the second fixing assembly 400. By rotating the rotating disk 200, the angle between the two straight pipe sections can be adjusted according to the angle of the elbow to be welded, so as to adapt to different angles of bending. Head welding.

In order to improve the installation convenience of the rotary disk 200, the base 100 includes a bottom plate portion 120 and a boss portion 130 protruding from the bottom plate portion 120. The surface of the boss portion 130 away from the bottom plate portion 120 forms a first support surface, and the rotary disk 200 rotates Installed on the bottom plate portion 120 , the thickness of the boss portion 130 is consistent with the thickness of the rotary disk 200 . This arrangement enables the rotary disk 200 to be rotatably supported on the bottom plate portion 120 on the basis of ensuring that the first support surface and the second support surface are coplanar, with high installation convenience and strong installation stability.

More preferably, the boss portion 130 and the rotary disk 200 are concentric fan-shaped structures, the axis corresponding to the fan-shaped structure is located on the rotation axis of the rotary disk 200, and the central angle corresponding to the boss portion 130 is the central angle corresponding to the rotary disk 200. The sum is less than 360°. As a result, the boss portion 130 and the rotary disk 200 are dislocated in the circumferential direction of the rotation center, and the two sides of the boss portion 130 can form a rotation limit for the rotary disk 200, thereby improving the rotation limit of the rotary disk 200. Bit reliability, and improve overall appearance aesthetics.

The bottom plate portion 120 is preferably a disk-shaped structure, and the center of the disk-shaped structure is concentric with the circle center of the fan-shaped structure, and the outer diameter of the bottom plate portion 120 is equal to the outer diameter of the fan-shaped structure, so that the overall structural size of the elbow welding fixing device is relatively small. Small, less edges, and strong appearance. Further, the boss portion 130 and the bottom plate portion 120 are preferably integrally formed. In other embodiments, they can also be processed separately and connected by welding or detachable connection.

FIG. 2 is a schematic structural diagram of the elbow welding fixing device provided by the present invention. As shown in FIG. 2 , a positioning column 410 is installed on the center of the base 100, and a through hole is opened at the center of the fan-shaped circle of the rotating disk 200, so that the The rotating disk 200 can be sleeved on the positioning column 410 on the base 100 to ensure that the rotating disk 200 can rotate on the base 100 with the positioning column 410 as the axis. Preferably, the positioning post 410 is a metal cylinder, and a circular hole is formed in the center of the base 100, and the positioning post 410 can be inserted into the circular hole.

The second fixing assembly 400 can optionally include a pressing member 410 and the above-mentioned positioning column 410. The pressing member 420 and the positioning column 410 are arranged at intervals and cooperate with a clamping elbow, and the distance between the pressing member 420 and the positioning column 410 can be adjusted. , to adapt to elbows of different pipe diameters, and to improve the clamping stability and convenience of elbows.

In order to more conveniently adjust the distance between the pressing member 420 and the positioning post 410 , the second fixing assembly 400 further includes a connecting rod 430 and a locking nut 440 . One end of the connecting rod 430 is connected with the pressing member 420, and the other end of the connecting rod 430 is slidably connected with the positioning column 410, so that the pressing member 420 is close to or away from the positioning column 410, so that the pressing member 420 and the positioning column 410 can cooperate to clamp Holding the elbow, the locking nut 440 is screwed on the connecting rod 430 and abuts against the side of the positioning post 410 away from the pressing member 420 .

One end of the connecting rod 430 is preferably welded with the pressing member 420, and the top of the positioning column 410 is provided with a through hole, and the connecting rod 430 can pass through the through hole and slide in the through hole, so as to drive the pressing member 420 closer to or away from the positioning The post 410 enables the pressing member 420 to cooperate with the positioning post 410 to clamp the fixed elbow. The other end of the connecting rod 430 is provided with a threaded section, and the locking nut 440 is screwed on the threaded section. The locking nut 440 can abut against the positioning column 410 on the side of the positioning column 410 away from the pressing member 420 , so that the pressing member 420 cooperates with the positioning column 410 to clamp the elbow to prevent deflection or rotation of the elbow. When it is necessary to fix the elbow and the straight pipe section to be welded, the lock nut 440 can be loosened first to expand the distance between the pressing member 420 and the positioning column 410, and the elbow is placed on the pressing member 420 and the positioning column. Between 410 , the locking nut 440 is then screwed and tightened, so that the pressing member 420 presses the elbow against the positioning post 410 tightly.

The positioning column 410 is preferably rotatably connected to the base 100, and the rotation axis of the positioning column 410 is collinear with the rotation axis of the rotary disk 200, so that the second fixing assembly 400 can be rotated as a whole around the axis of the positioning column 410, thereby adjusting the pair of the second fixing assembly 400. The clamping position of the elbow can better adapt to the fixing of the elbow with different bending angles.

The first fixing assembly 300 includes a baffle plate 310 and a clamping unit 320. The clamping unit 320 is opposite to the baffle plate 310 and is arranged at an interval to cooperate to clamp the straight pipe section. Preferably, the distance between the clamping unit 320 and the baffle 310 can be adjusted to adapt to straight pipe sections with different pipe diameters, and to improve the clamping stability and convenience of the straight pipe sections.

The clamping unit 320 preferably includes a fixing plate 321 and an adjusting bolt 322 , the fixing plate 321 is opposite to the baffle 310 and is arranged at an interval, the adjusting bolt 322 is screwed on the fixing plate 321 , and the end of the adjusting bolt 322 extends into the fixing plate 321 and the baffle 310 to abut the straight pipe section. Loosen the adjusting bolt 322, place the straight pipe section between the baffle 310 and the fixing plate 321, and adjust the adjusting bolt 322 until the straight pipe section is compacted but can move in the axial direction. Adjust the position of the straight pipe section so that the straight pipe section is in contact with the elbow, and tighten the adjusting bolt 322 to complete the fixing of the straight pipe section. The operation is simple and convenient, and the fixing efficiency of the straight pipe section is improved.

The baffle 310 is preferably a long metal plate welded on the base 100 . The fixing plate 321 is spaced apart from and parallel to the baffle 310 . The fixing plate 321 is provided with a plurality of threaded through holes, and the adjusting bolts 322 are screwed on the threaded through holes of the fixing plate 321, pass through the fixing plate 321, abut with the straight pipe section to be welded, and cooperate with the baffle 310 to clamp and fix Straight pipe section to be welded. As an alternative, a sliding rail may be provided on the base 100, the baffle 310 and the clamping unit 320 are installed on both ends of the sliding rail, and the baffle 310 and the baffle 310 can be adjusted by sliding on the sliding rail. The distance between 310 and the clamping unit 320.

In the elbow welding and fixing device provided in this embodiment, the baffle 310 and the clamping unit 320 cooperate to clamp and fix the straight pipe section, and the positioning column 410 and the pressing member 420 cooperate to clamp the elbow. When it is necessary to weld elbows of various diameters At the same time, the distance between the baffle 310 and the clamping unit 320 and the distance between the pressing member 420 and the positioning column 410 can be adjusted to meet the requirements of clamping elbows of various diameters.

It is worth noting that the maximum distance between the pressing member 420 and the positioning column 410, the specific distance between the fixing plate 321 and the baffle 310, and the number and diameter of the threaded through holes on the fixing plate 321 should be in accordance with this specification. The actual use range design of the elbow welding device is not specifically limited in this application.

As shown in FIG. 3 , on the basis of the above-mentioned embodiment, in an optional embodiment, the rotary disk 200 provided by the present invention is provided with an arc-shaped groove 210 , and the center of the arc-shaped groove 210 is located in the rotation of the rotary disk 200 . On the axis, the base 100 is provided with a threaded hole 110 which is in direct communication with the arc groove 210 .

The elbow welding fixing device provided by the present invention can be threadedly connected with the threaded hole 110 on the base 100 through the locking bolt 220, and the rotating disk 200 can be pressed and fixed. The arc-shaped groove 210 is formed so that the locking bolt 220 can slide in the arc-shaped groove 210. When the rotation of the rotary disk 200 is required to adjust the angle of the first fixing component 300 on the rotary disk 200, the locking bolt 220 can be loosened to rotate. Rotating the disk 200 realizes the adjustment of the angle of the first fixing assembly 300 and the locking after the angle adjustment.

Specifically, a plurality of threaded holes 110 are opened on the bottom plate facing the arc-shaped groove 210 , and the plurality of threaded holes 110 are arranged at intervals along the circumferential direction of the rotating disk 200 . The locking bolts 220 can pass through the arc grooves 210 to be threadedly connected to the threaded holes 110 , and the bolt heads of the locking bolts 220 are pressed against the rotary disk 200 to be fixed on the base 100 in rotation. The size of the threaded hole 110 , the type of the locking bolt 220 , the angle range of the arc groove 210 and the number of the threaded hole 110 should be designed according to actual production needs, and the present invention does not make more requirements.

Preferably, an angle scale can be set on the rotating disk 200 or the bottom plate 100 to display the angle between the two first fixing components 300. When fixing elbows with different angles, it is only necessary to rotate the rotating disk 200 to the specified angle. scale, and then screw the locking bolt 220 to fix the rotary disk 200.

The utility model also provides a pipe fitting processing device, comprising an elbow welding fixing device.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims (10)

1. An elbow welding fixture for fixing an elbow and two straight pipe sections to be welded on both ends of the elbow, wherein the elbow welding fixture comprises: A first fixing assembly (300), the two first fixing assemblies (300) can rotate relative to each other in the circumferential direction around the rotation center, and the two first fixing assemblies (300) are respectively used to fix the two straight pipe sections ; A second fixing component (400) is installed at the rotation center, and the second fixing component (400) is used for fixing the elbow. 2. The elbow welding fixing device according to claim 1, wherein the elbow welding fixing device further comprises: a base (100) having a first support surface; A rotating disk (200), which is rotatably connected to the base (100), the rotating disk (200) has a second supporting surface, the first supporting surface and the second supporting surface are coplanar, and the first supporting surface is coplanar with the second supporting surface. Both the supporting surface and the second supporting surface are provided with the first fixing component (300). 3. The elbow welding fixing device according to claim 2, wherein the first fixing component (300) comprises a baffle plate (310) and a clamping unit (320), and the clamping unit (320) Opposite to the baffle plate (310) and arranged at an interval, so as to cooperate with clamping the straight pipe section, and the distance between the clamping unit (320) and the baffle plate (310) can be adjusted; And/or, the second fixing assembly (400) includes a positioning column (410) and a pressing member (420) that are opposite and spaced apart, and the positioning column (410) is mounted on the base (100), so The pressing member (420) cooperates with the positioning column (410) to clamp the elbow, and the distance between the pressing member (420) and the positioning column (410) can be adjusted. 4. The elbow welding fixing device according to claim 3, wherein the second fixing assembly (400) further comprises a connecting rod (430) and a locking nut (440), the connecting rod (430) One end of the connecting rod (430) is connected with the pressing member (420), and the other end of the connecting rod (430) is slidably connected with the positioning column (410), so that the pressing member (420) is close to or away from the positioning a post (410), the locking nut (440) is screwed on the connecting rod (430) and abuts against the side of the positioning post (410) away from the pressing member (420); And/or, the clamping unit (320) includes a fixing plate (321) and an adjusting bolt (322), the fixing plate (321) is opposite to the baffle plate (310) and is arranged at an interval, and the adjusting bolt ( 322) is screwed on the fixing plate (321), and the end of the adjusting bolt (322) extends between the fixing plate (321) and the baffle plate (310) to abut the straight Pipe section. 5 . The elbow welding fixing device according to claim 3 , wherein the rotating disk ( 200 ) is rotatably sleeved on the positioning column ( 410 ), and the axis of the positioning column ( 410 ) is the The rotation axis of the rotary disk (200). 6 . The elbow welding fixing device according to claim 5 , wherein the positioning column ( 410 ) is rotatably connected to the base ( 100 ), and the rotation axis of the positioning column ( 410 ) is connected to the The axes of rotation of the rotary disk (200) are collinear. 7. The elbow welding fixing device according to any one of claims 2-6, wherein an arc-shaped groove (210) is formed on the rotating disk (200), and the arc-shaped groove (210) is The center of the circle is located on the rotation axis of the rotary disk (200), the base (100) is provided with a threaded hole (110) that is in direct communication with the arc-shaped groove (210), and the rotary disk (200) is connected to the The base (100) is fastened by a locking bolt (220) passing through the threaded hole (110) and the arc-shaped groove (210); And/or, an angle scale is provided on the rotary disk (200) or the base (100), and the angle scale is used to indicate the rotation angle of the rotary disk (200). 8. The elbow welding fixing device according to any one of claims 2-6, characterized in that, the base (100) comprises a bottom plate portion (120) and a protruding protrusion disposed on the bottom plate portion (120). A platform portion (130), the surface of the boss portion (130) away from the bottom plate portion (120) forms the first support surface, and the rotary disk (200) is rotatably mounted on the bottom plate portion (120) . 9 . The elbow welding fixing device according to claim 8 , wherein the boss portion ( 130 ) and the rotating disk ( 200 ) are fan-shaped structures arranged concentrically, and the boss portion ( 130 ) The sum of the corresponding central angle and the central angle corresponding to the rotating disk (200) is less than 360°. 10. A pipe fitting processing device, comprising the elbow welding fixing device according to any one of claims 1-9.

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