A butt welding elbow processing device and process

Abstract

The present application relates to the technical field of elbow processing, and provides an elbow processing device and process, wherein the elbow processing device is used for welding the joint gap of two half-circle elbows to form an elbow, comprising a rack, guide rails and a welding unit, two groups of guide rails are swing-connected with the rack, the guide rails are arc-shaped, the welding unit is slidably arranged on the guide rails, the two groups of guide rails can swing towards each other to enter from both ends of the elbow and swing to be connected, so that the welding unit moves along the two groups of guide rails in sequence and welds the joint gap of the inner arc and / or outer arc of the elbow. Through the above technical scheme, the welding unit is provided with a running track, so that the welding unit can move along the joint gap, the welding path is guaranteed to coincide with the joint gap of the inner wall of the elbow, welding deviation when the welding machine is manually operated is avoided, and the technical problem that manual operation of the welding machine to weld the elbow is time-consuming and laborious and is not easy to guarantee welding precision in the related art is solved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of elbow processing, in particular, to an equipment and process for processing a butt-welding elbow. BACKGROUND

[0002] In the modern industrial field, pipeline systems are widely used in many industries such as petroleum, chemical industry, electric power, construction, etc., and undertake the important task of conveying various fluid media.

[0003] In the field of processing and manufacturing large butt-welding elbows, the commonly used process at present is to first make a semicircular elbow from a fan-shaped raw material plate through stamping process, and then splice two semicircular elbows to form a complete elbow prototype. In the splicing process, usually, spot welding is first performed at the splicing gap to achieve preliminary connection, and then the elbow is positioned for the final welding process.

[0004] However, the existing traditional welding method is that the operator enters the inside of the elbow and manually operates the welding machine to walk along the splicing gap to complete the welding. This method not only takes time and effort, but also increases the labor intensity of workers. Moreover, due to the limited operation space inside the elbow, the operator has difficulty in moving, and it is difficult to guarantee the accuracy of welding, which may lead to unstable welding quality and affect the overall quality of the butt-welding elbow.

[0005] To solve the problem of welding accuracy, some enterprises use high-precision fully automatic welding robots. Although such robots can realize automatic welding and greatly improve the welding accuracy and efficiency, the cost of purchasing the equipment is high, and the subsequent maintenance cost is also high. This makes many enterprises, especially some small and medium-sized enterprises, difficult to bear due to cost factors.

[0006] In summary, how to develop an equipment and process for processing a butt-welding elbow with simple operation and moderate cost while guaranteeing the welding quality of the butt-welding elbow has become an important technical problem to be solved in the field of manufacturing butt-welding elbows. SUMMARY

[0007] To overcome the above-mentioned defects, embodiments of the present application provide an equipment and process for processing a butt-welding elbow, which solves the technical problem that manual operation of a welding machine for butt-welding an elbow is time-consuming and laborious and difficult to guarantee the welding accuracy in the related art.

[0008] According to one aspect, at least one embodiment of the present application provides an equipment for processing a butt-welding elbow, which is used for welding a splicing gap of two semicircular elbows to form an elbow, and includes a rack, guide rails and a welding unit. The rack is used to support two semicircular elbows connected by spot welding. Two groups of guide rails are provided, and each group of guide rails is swing-connected with the rack. The guide rails are arc-shaped. The welding unit is slidably arranged on the guide rails,

[0009] The two groups of guide tracks are configured to be able to swing towards each other to enter from two ends of the elbow and swing to connect, so that the welding unit moves along the two groups of guide tracks in turn and welds the joint gaps of the inner arc and / or the outer arc of the elbow.

[0010] For example, the welding elbow processing equipment provided by at least one embodiment of the present application further comprises:

[0011] The guide track comprises an inner track corresponding to the joint gap of the inner arc of the elbow and an outer track located outside the inner track corresponding to the joint gap of the outer arc of the elbow.

[0012] For example, the welding elbow processing equipment provided by at least one embodiment of the present application further comprises:

[0013] The outer ends of the inner track and the outer track are connected by a semicircular connecting track located on the side away from the two guide tracks;

[0014] The two groups of guide tracks are configured to be able to enter from two ends of the elbow and connect to form a closed circulating track, so that the welding unit can slide along the circulating track to continuously weld the joint gaps of the inner arc of the elbow and the outer arc of the elbow.

[0015] For example, the welding elbow processing equipment provided by at least one embodiment of the present application further comprises:

[0016] A gear is rotatably arranged on the welding unit, a rack is arranged along the extending direction of the circulating track, the gear can engage with the rack to drive the welding unit to slide along the circulating track, a guide sliding groove is arranged along the extending direction of the circulating track, a guide roller is rotatably arranged on the welding unit, and the guide roller is located in the guide sliding groove and rolls with the guide sliding groove.

[0017] For example, the welding elbow processing equipment provided by at least one embodiment of the present application further comprises:

[0018] A support plate is arranged on the guide track, the support plate is a plurality of and is spaced apart along the extending direction of the guide track, the support plate has an adjusting groove arranged perpendicularly to the extending direction of the guide track, a support shaft is bolted in the adjusting groove, and a support wheel is rotatably arranged on the support shaft,

[0019] The support wheel can enter the elbow and abut against the inner wall of the elbow under the swing of the guide track,

[0020] The position of the support shaft in the adjusting groove can be adjusted to adjust the degree of abutment of the support wheel against the inner wall of the elbow.

[0021] For example, the welding elbow processing device provided by at least one of the embodiments of the present application further comprises:

[0022] The two support frames are symmetrically arranged on the rack, and the support frames are provided with supporting grooves for supporting the elbow. The lifting frame is arranged between the two support frames on the rack, and an adjusting wheel is rotatably arranged on the lifting frame. The adjusting wheel can abut against the lower wall of the elbow and drive the elbow to swing to adjust the placement angle of the elbow when moving upwards on the lifting frame.

[0023] For example, the welding elbow processing device provided by at least one of the embodiments of the present application further comprises:

[0024] The adjacent ends of the two groups of guide rails are provided with an insertion part and an insertion slot that can be inserted and matched. The two groups of guide rails are positioned and matched by means of the insertion part and the insertion slot.

[0025] For example, the welding elbow processing device provided by at least one of the embodiments of the present application further comprises:

[0026] The two groups of swing frames are symmetrically arranged on the rack, and the two groups of guide rails are arranged on the two groups of swing frames one by one. The rotation axis of the swing frame is configured to be concentric with the elbow.

[0027] For example, the welding elbow processing device provided by at least one of the embodiments of the present application further comprises:

[0028] The adjacent ends of the two groups of swing frames are provided with positioning clamps. The positioning clamps can clamp the two ends of the elbow to position the elbow under the driving of the swing frame.

[0029] For example, the welding elbow processing device provided by at least one of the embodiments of the present application further comprises:

[0030] S1 loading: splice and spot weld the spliced joint of the two half-circle elbows, hoist and transfer the elbow to the rack and position it;

[0031] S2 insertion of the rail: the two groups of guide rails are swung towards each other and inserted into the elbow to be connected, thereby providing a moving route for the welding unit to fit the joint arc of the inner wall of the elbow;

[0032] S3 welding: the welding unit is sequentially slid along the two groups of guide rails connected to each other to continuously weld the joint of the inner arc and the outer arc of the elbow.

[0033] The embodiments of the present application have the following beneficial effects:

[0034] In this invention, during the welding of the butt-welded elbow, the two semi-circular elbow halves are first spliced ​​and spot-welded for preliminary connection. Then, the assembled elbow is placed in a suitable position on the frame. Two sets of guide rails are controlled to enter the elbow from both ends, allowing them to connect inside the elbow, thus forming a complete guide rail within the elbow that matches the curvature of the elbow's splice seam. Next, the welding unit is activated, moving along the pre-assembled guide rails to weld the splice seam on the inner wall of the elbow.

[0035] Because the guide rail provides a precise travel trajectory for the welding unit, the welding unit can move along the splice seam, ensuring that the welding path matches the splice seam of the inner wall of the elbow. This avoids welding deviations caused by limited operating space when manually operating the welding machine, improves welding accuracy, and reduces the labor intensity of workers. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0037] Figure 1 This is a schematic diagram of the external structure of a butt-welding elbow processing equipment according to one embodiment of the present invention;

[0038] Figure 2 for Figure 1 A schematic diagram of the structure of the loop track in the embodiment;

[0039] Figure 3 for Figure 1 A schematic diagram of the structure of a butt-welding elbow processing equipment without elbows installed in one of the embodiments;

[0040] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0041] Figure 5 for Figure 1 A schematic diagram of the guide rail structure in the embodiment;

[0042] Figure 6 for Figure 5 Enlarged view at point B in the middle;

[0043] Figure 7 for Figure 1 A schematic diagram of the slot structure in the embodiment.

[0044] In the figure: 1, frame, 201, guide rail, 3, welding unit, 2011, inner rail, 2012, outer rail, 202, connecting rail, 2, circulating rail, 4, gear, 5, rack, 6, guide chute, 7, guide roller, 8, support plate, 9, adjusting groove, 10, support shaft, 11, support wheel, 12, support frame, 13, lifting frame, 14, adjusting wheel, 15, insertion part, 16, insertion groove, 17, swing frame, 18, positioning clamp. DETAILED DESCRIPTION

[0045] The application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of interpretation of the present application, but not for the limitation of the present application.

[0046] In order to make the drawing simple, only the parts related to the present application are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this text, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0047] In this text, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", and "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0049] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0050] In addition, in the description of the present application, the terms "first", "second", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0051] As Figures 1-7 shown, it shows a butt joint elbow processing equipment for welding the joint gap of two half circle elbows in an embodiment of the present application, which comprises a rack 1, a guide rail 201 and a welding unit 3. The rack 1 is the basic support structure of the whole processing equipment. The guide rail 201 is provided with two groups and is arc-shaped, and its curvature is the same as that of the inner wall of the elbow to be welded, which provides a running track for the welding unit 3, so that the welding unit 3 can move along the path consistent with the joint gap of the elbow, ensuring the accuracy of welding. The two groups of guide rails 201 are movably arranged relative to the rack 1, and the welding unit 3 is slidably arranged on the guide rail 201. The welding unit 3 adopts a conventional welding machine, and its welding head faces the inner wall of the elbow.

[0052] When welding the butt joint elbow, first, the two half circle elbows are jointed and spot welded for preliminary connection, and then the assembled elbow is placed at a suitable position of the rack 1. The two groups of guide rails 201 are controlled to enter the inside of the elbow from both ends of the elbow respectively, and the two groups of guide rails 201 can be butt jointed in the inside of the elbow, so that the end portions are connected with each other, thereby forming a complete guide rail 201 in the elbow which is consistent with the curvature of the joint gap of the elbow. Then, the welding unit 3 is started, and the welding unit 3 moves along the already jointed guide rail 201 to weld the joint gap of the inner wall of the elbow.

[0053] Since the guide rail 201 provides a precise running track for the welding unit 3, the welding unit 3 can move along the joint gap, ensuring that the welding path is consistent with the joint gap of the inner wall of the elbow, avoiding the welding deviation caused by the limited operation space when manually operating the welding machine, improving the welding precision, and reducing the labor intensity of workers.

[0054] If the guide rail 201 is designed as an integral structure, it can enter from one end of the elbow, but the overall structure will form a cantilever structure, and the end portion extending into the elbow cannot be supported, and the structural strength is poor. Therefore, the guide rail 201 is designed as two groups in the present scheme, which enter from both ends of the elbow and are connected in the inside of the elbow, so that the overall structural strength is higher and can bear the weight of the welding unit 3.

[0055] In some examples, as Figure 2As shown, the guide rail 201 consists of an inner rail 2011 and an outer rail 2012, which correspond to the splicing gaps of the inner and outer arc inner walls of the elbow, respectively. Before welding the elbow, the two sets of guide rails 201 enter the elbow from both ends. The inner rail 2011 moves along the direction of the inner arc of the elbow, and the outer rail 2012 moves along the direction of the outer arc of the elbow. This allows the inner rail 2011 and outer rail 2012 to reach the splicing gap positions of the inner and outer arc inner walls of the elbow, respectively, and achieve end connection inside the elbow.

[0056] Welding units 3 can be installed on both the inner track 2011 and the outer track 2012. The welding unit 3 on the inner track 2011 moves along the inner track 2011 to weld the splice seam of the inner arc of the elbow; simultaneously, the welding unit 3 on the outer track 2012 moves along the outer track 2012 to weld the splice seam of the outer arc of the elbow. Since the curvature of the inner track 2011 and the outer track 2012 is consistent with the curvature of the corresponding splice seam, the welding unit 3 can weld along a precise trajectory, ensuring the welding quality of the inner and outer arcs.

[0057] By setting up inner rails 2011 and outer rails 2012 corresponding to the splicing gaps of the inner and outer arcs of the elbow, respectively, high-quality welding is ensured at the splicing points of both the inner and outer arcs of the elbow, improving the overall quality of the butt-welded elbow. Furthermore, with inner rails 2011 and outer rails 2012 working simultaneously, the two welding units 3 can weld the splicing gaps of the inner and outer arcs of the elbow at the same time. Compared to the traditional method of welding the inner or outer arc first and then the other side, this saves welding time and improves welding efficiency.

[0058] In some examples, such as Figure 2 As shown, the connecting track 202 is semi-circular and serves to connect the outer ends of the inner track 2011 and the outer track 2012. The two sets of guide tracks 201 connected by the connecting track 202 can enter the bend from both ends and connect to each other inside the bend, thus forming a closed loop track 2. Specifically, the two inner tracks 2011 of the two sets of guide tracks 201 are connected to each other, and the two outer tracks 2012 are connected to each other.

[0059] After the two half-circular elbows are spliced and preliminarily fixed by spot welding, the two groups of guide tracks 201 enter the inside of the elbow from both ends of the elbow and realize end-to-end connection inside the elbow. After the two groups of guide tracks 201 are connected to form a closed circulating track 2, the welding unit 3 moves along the circulating track 2 in a circulating manner. For example, the welding unit 3 can first weld the spliced joint gap of the inner arc inner wall of the elbow along the inner track 2011, and after the welding unit 3 moves to the end of the inner track 2011, the welding unit 3 can enter the outer track 2012 through the connecting track 202 to weld the spliced joint gap of the outer arc inner wall of the elbow, so as to realize continuous welding of the spliced joint gaps of the inner arc inner wall and the outer arc inner wall of the elbow.

[0060] The design of the closed circulating track 2 enables the welding unit 3 to continuously move on the spliced joint gaps of the inner arc and the outer arc inner wall of the elbow without stopping or repositioning between the inner arc and the outer arc welding, thereby improving the welding efficiency, avoiding the problem of welding parameter fluctuation caused by starting and stopping or repositioning, and improving the welding quality of the butt welded elbow.

[0061] In some examples, as shown in Figure 5 , 6 A gear 4 is arranged on the welding unit 3, and a rack 5 is arranged on the circulating track 2 along the extending direction thereof, and the gear 4 and the rack 5 are in meshing state. A guide roller 7 is arranged on the welding unit 3, and a guide sliding groove 6 is opened on the circulating track 2 along the extending direction thereof, and the guide roller 7 is located in the guide sliding groove 6 and can roll in the guide sliding groove 6 to provide a guiding effect for the movement of the welding unit 3.

[0062] When the butt welded elbow processing equipment starts the welding operation, the motor installed on the welding unit 3 starts to operate, and the motor drives the gear 4 connected therewith to rotate. Since the gear 4 is in meshing state with the rack 5, the welding unit 3 moves along the circulating track 2 to provide a driving force for the welding unit 3, thereby realizing the welding of the spliced joint gaps of the inner arc inner wall and the outer arc inner wall of the elbow. At the same time, the guide roller 7 on the welding unit 3 is located in the guide sliding groove 6 of the circulating track 2. During the movement of the welding unit 3, the guide roller 7 rolls along the guide sliding groove 6. The constraint effect of the guide sliding groove 6 on the guide roller 7 ensures that the welding unit 3 will not deviate or shake during the movement, thereby ensuring the stability of the movement of the welding unit 3.

[0063] In some examples, as shown in Figure 2As shown, a plurality of support plates 8 are arranged on the guide rail 201, which are evenly distributed along the extension direction of the guide rail 201, and each support plate 8 is processed with a strip-shaped adjusting groove 9, and a support shaft 10 is bolted in the adjusting groove 9 through a nut, and the support shaft 10 is rotationally arranged with a support wheel 11. Specifically, the support shaft 10 has a shaft shoulder and a threaded end, and during installation, the threaded end is inserted into the adjusting groove 9 until the shaft shoulder abuts against the support plate 8, and then the nut is threadedly connected to the threaded end, and the nut and the shaft shoulder jointly clamp the support plate 8, thereby achieving locking of the support shaft 10.

[0064] During welding, the position of the support wheel 11 is first adjusted, the nut connected with the support shaft 10 is loosened, the support shaft 10 is moved to a suitable position in the adjusting groove 9, so that the support wheel 11 can provide a suitable abutting force when abutting against the inner wall of the elbow. Then the nut is tightened to fix the support shaft 10 at the current position in the adjusting groove 9. When the guide rail 201 enters the elbow, the support wheel 11 contacts and rolls along the inner wall of the elbow. After the guide rail 201 is moved into position, the support wheel 11 tightly abuts against the inner wall of the elbow, providing additional support for the guide rail 201 and ensuring the relative stability between the welding unit 3 and the elbow during movement.

[0065] In some examples, as shown in Figure 3 As shown, the support frame 12 is arranged in pairs on the rack 1, and the support frame 12 is designed with a V-shaped supporting groove for supporting the elbow. The rack 1 is also provided with a lifting frame 13 between the two support frames 12. The lifting frame 13 is rotationally arranged with an adjusting wheel 14 made of rubber. The adjusting wheel 14 can abut against the elbow when the lifting frame 13 is raised, and can adjust the placement angle of the elbow in the supporting groove of the support frame 12 when it is rotated.

[0066] During processing, the elbow preliminarily fixed by splicing and spot welding is first placed on the supporting groove of the support frame 12. Then the lifting frame 13 is raised, the adjusting wheel 14 gradually approaches the elbow, and finally abuts against the surface of the elbow. When the adjusting wheel 14 abuts against the elbow, the adjusting wheel 14 is driven to rotate by the motor installed on the lifting frame 13, and the elbow is swung in the supporting groove by the friction force between the adjusting wheel 14 and the surface of the elbow, until the elbow is in a vertical plane, so that the splicing gap is parallel to the guide rail 201, and then the lifting frame 13 is lowered to reset. By adjusting the placement angle of the elbow by the adjusting wheel 14, the splicing gap of the elbow is parallel to the guide rail 201, ensuring that the relative position and angle between the welding torch and the splicing gap remain stable during welding of the welding unit 3, thereby ensuring the welding precision.

[0067] In some examples, as shown in Figure 6 , 7As shown, at the end of the two groups of guide rails 201, respectively, the insertion part 15 and the insertion slot 16 capable of being inserted into each other are designed. Two groups of swing frames 17 are symmetrically arranged on the rack 1, and the rotation axis of the swing frame 17 is configured to be concentric with the elbow, so that the guide rail 201 can move along the circumference of the elbow. The positioning clamp 18 is arranged on the swing frame 17, and the positioning clamp 18 is made of rubber material.

[0068] During welding, first place the elbow on the support frame 12, and then the swing frame 17 drives the guide rail 201 to move to both ends of the elbow. During the movement of the guide rail 201, due to the concentricity of the rotation axis of the swing frame 17 and the elbow, the guide rail 201 can move along the circumference of the elbow. After the guide rail 201 enters the elbow, the insertion part 15 at the end is aligned with the insertion slot 16 at the end of the other group of guide rails 201 and is inserted into each other, realizing the connection of the two groups of guide rails 201. At the same time, the two groups of swing frames 17 drive the two groups of positioning clamps 18 to clamp the two ends of the elbow, further ensuring the stability of the elbow.

[0069] The insertion part 15 and the insertion slot 16 improve the stability of the two groups of guide rails 201 after being connected through the insertion fit. The design of the rotation axis of the swing frame 17 concentric with the elbow makes the guide rail 201 move along the circumference of the elbow, ensuring that the guide rail 201 and the inner wall of the elbow joint gap remain in a close relationship. The positioning clamp 18 clamps the side wall of the elbow end under the drive of the swing frame 17, providing additional positioning for the elbow.

[0070] In some examples, a butt welding elbow processing process uses a butt welding elbow processing device, including the following steps:

[0071] S1 loading: splice and spot weld the spliced joint of the two half-circle elbows, hoist and transfer the elbow to the rack and position it;

[0072] S2 insert the rail: two groups of guide rails are inserted into the elbow to be connected, providing a moving route for the welding unit to fit the joint gap arc of the inner wall of the elbow;

[0073] S3 welding: the welding unit slides along the two groups of guide rails connected in sequence to continuously weld the joint gap of the inner arc and the outer arc of the elbow.

[0074] In this embodiment, by combining two groups of guide rails 201 to form a circulating track 2, the welding unit 3 can continuously move and weld along the joint gap of the inner wall of the inner arc and the outer arc of the elbow, without stopping or repositioning between the inner and outer arc welding, improving the welding efficiency. With the butt welding elbow processing device, automatic welding is realized, the welding precision is improved, and the operator does not need to enter the elbow to manually operate the welding machine, reducing the labor intensity of the workers.

[0075] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A butt-welded bend processing apparatus for welding a joint gap of two half-circular bends to be formed into a bend, characterized by, Including frame (1), guide rail (201) and welding unit (3), the frame (1) is used for supporting two point welding connection semicircular elbow, the guide rail (201) is provided with two groups, two groups of the guide rail (201) are swing connected with the frame (1), the guide rail (201) is arc-shaped, the welding unit (3) is slidably arranged on the guide rail (201), Two groups of the guide rail (201) are configured to be able to swing towards each other to enter from both ends of the elbow respectively and swing to be connected, so that the welding unit (3) moves along two groups of the guide rail (201) in turn and welds the joint gap of the inner arc and / or outer arc of the elbow, The guide rail (201) includes an inner rail (2011) and an outer rail (2012) located outside the inner rail (2011), the inner rail (2011) corresponds to the joint gap of the inner arc of the elbow, and the outer rail (2012) corresponds to the joint gap of the outer arc of the elbow, The outer ends of the inner rail (2011) and the outer rail (2012) are connected by a semicircular connecting rail (202), and the connecting rail (202) is located on the side away from the two guide rails (201), Two groups of the guide rail (201) are configured to be able to enter from both ends of the elbow respectively and be connected to form a closed circulating track (2), so that the welding unit (3) can slide along the circulating track (2) to continuously weld the joint gap of the inner arc of the elbow and the outer arc of the elbow.

2. A butt weld elbow machining apparatus according to claim 1, wherein A gear (4) is rotatably arranged on the welding unit (3), a rack (5) is arranged along the extending direction of the circulating track (2), the gear (4) can engage with the rack (5) to drive the welding unit (3) to slide along the circulating track (2), a guide sliding groove (6) is formed in the circulating track (2) along the extending direction of the circulating track (2), and a guide roller (7) is rotatably arranged on the welding unit (3), the guide roller (7) is located in the guide sliding groove (6) and rolls with the guide sliding groove (6).

3. A butt weld elbow machining apparatus according to claim 1, wherein A support plate (8) is arranged on the guide rail (201), the support plate (8) is spaced apart along the extending direction of the guide rail (201), the support plate (8) has an adjusting groove (9) arranged perpendicularly to the extending direction of the guide rail (201), a support shaft (10) is bolted in the adjusting groove (9), and a support wheel (11) is rotatably arranged on the support shaft (10), The support wheel (11) can enter the elbow and abut against the inner wall of the elbow under the swing of the guide rail (201), The position of the support shaft (10) in the adjusting groove (9) can be adjusted to adjust the degree of abutment of the support wheel (11) against the inner wall of the elbow.

4. The butt weld elbow machining apparatus of claim 1, wherein The two support frames (12) are symmetrically arranged on the rack (1), and the support frames (12) are provided with supporting grooves for supporting the elbow, and the rack (1) is further provided with a lifting frame (13) between the two support frames (12), and the lifting frame (13) is rotatably provided with an adjusting wheel (14), and the adjusting wheel (14) can abut below the peripheral wall of the elbow under the action of the lifting frame (13), and can drive the elbow to swing to adjust the placement angle of the elbow.

5. A butt weld elbow machining apparatus according to claim 1, wherein The adjacent ends of the two groups of guide rails (201) are provided with an insertion part (15) and an insertion groove (16) that can be inserted and matched, and the two groups of guide rails (201) are positioned and matched by means of the insertion part (15) and the insertion groove (16).

6. A butt weld elbow machining apparatus according to claim 1, wherein The two groups of swing frames (17) are symmetrically arranged on the rack (1), and the two groups of guide rails (201) are respectively arranged on the two groups of swing frames (17), and the rotation axis of the swing frame (17) is configured to be concentric with the elbow.

7. A butt fusion socket machining apparatus according to claim 6, wherein The adjacent ends of the two groups of swing frames (17) are provided with a positioning clamp (18), and the positioning clamp (18) can clamp the two ends of the elbow under the action of the swing frame (17) to position the elbow.

8. A process for manufacturing a butt welded elbow using the butt welded elbow manufacturing apparatus according to any one of claims 1 to 7, characterized by, The steps include: S1 feeding: two half-round elbows are spliced and spot-welded at the splicing gap, the elbow is hoisted and transferred to the rack (1) and positioned; S2 inserting the rail: the two groups of guide rails (201) are inserted into the elbow to the joint by swinging towards each other, and a moving route that matches the splicing gap arc of the inner wall of the elbow is provided for the welding unit (3); S3 welding: the welding unit (3) slides along the two groups of guide rails (201) in sequence to continuously weld the splicing gap of the inner arc and the outer arc of the elbow.

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