Plate straight seam welding clamp

Abstract

The invention relates to the technical field of metal machining, in particular to a plate straight seam welding clamp which is used for clamping a pipe with the diameter smaller than 20 mm. The edge of one side of the fixed buckle plate is fixedly mounted on the central shaft; the edge of one side of the rotating buckle plate is rotationally mounted on the central shaft; wherein a clamping space used for clamping a pipe to be welded is formed between the fixed buckle plate and the rotary buckle plate, the clamping space is a first working position under the condition that the included angle between the fixed buckle plate and the rotary buckle plate is larger than 0 degree, and the clamping space is a second working position under the condition that the included angle between the fixed buckle plate and the rotary buckle plate is smaller than or equal to 0 degree. When the pipe in the clamping space is welded through the welding gap, due to the existence of the clamping space, the clamping space can provide supporting force for the pipe to be welded, and the amplitude of elastic deformation of the curled pipe is reduced, so that the small-size pipe can be welded, a clamping piece does not need to be additionally arranged in the pipe during welding, and the welding efficiency is improved. And the welding can be carried out normally.

Description

Technical Field

[0001] The invention relates to the technical field of metal processing, and in particular to a plate straight seam welding fixture. Background Art

[0002] Welding technology is widely used in industrial and civil fields, among which straight seam welding of plates plays an irreplaceable role in the fields of ships, pipelines, containers, etc. Straight seam welding of plates is to fuse two identical or different metals into one by welding, so as to achieve the functions of connection, sealing or pressure bearing. When the plate is thicker, it can be directly welded after being fixed by spot welding; when the plate is thinner, the plate itself is not strong enough to overcome the welding deformation caused by welding heat input, so the plate to be welded needs to be clamped before welding. However, for pipes with smaller diameters, there is not enough space in the inner cavity of the pipe to set the clamps, making straight seam welding impossible. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a straight seam welding fixture for plates, which solves the technical problem that straight seams cannot be welded due to the limitation that the inner cavity space of the pipe cannot be provided with clamping parts due to the small diameter of the pipe.

[0005] (II) Technical solution

[0006] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0007] An embodiment of the present invention provides a plate straight seam welding fixture.

[0008] A plate straight seam welding fixture provided in an embodiment of the present invention is used to clamp a pipe with a diameter less than 20 mm, comprising:

[0009] Central axis;

[0010] The fixed gusset plate has one edge fixedly mounted on the central axis;

[0011] Rotate the gusset plate so that one edge is rotated and installed on the central axis;

[0012] Among them, a clamping space for clamping the pipe to be welded is formed between the fixed gusset plate and the rotating gusset plate. When the angle between the fixed gusset plate and the rotating gusset plate is greater than 0°, the clamping space is the first working position. When the angle between the fixed gusset plate and the rotating gusset plate is less than or equal to 0°, the clamping space is the second working position.

[0013] When the clamping space is in the second working position, a welding gap for welding is formed at the top of the clamping space.

[0014] Optionally, the plate straight seam welding fixture further comprises:

[0015] The clamp is symmetrically and detachably mounted on the end faces of the fixed buckle plate and the rotating buckle plate which are close to each other, and the clamping space is arranged between the two clamps.

[0016] Optionally, the plate straight seam welding fixture further comprises:

[0017] The pillars are installed at both ends of the fixed gusset plate.

[0018] Optionally, the plate straight seam welding fixture further comprises:

[0019] The force-adding mechanism is arranged between the fixed buckle plate and the rotating buckle plate, and is used to make the fixed buckle plate and the rotating buckle plate relatively fixed when the clamping space is in the second working position.

[0020] Optionally, the force adding mechanism comprises:

[0021] A mounting groove is formed on the top of the fixed buckle plate and the rotating buckle plate;

[0022] A swing bolt, one end of which is rotatably installed in a mounting groove at the top of the fixed buckle plate or the rotating buckle plate;

[0023] A handle is threadedly mounted on the other end of the swing bolt.

[0024] Optionally, the fixed buckle plate and the rotating buckle plate are arranged in a canine-like manner.

[0025] Optionally, the plate straight seam welding fixture further comprises:

[0026] The fine-tuning screw is arranged between the clamp and the gusset plate and is used to adjust the distance between the two clamps.

[0027] Optionally, when the clamping space is in the second working position, the cross section of the clamping space 101 is circular.

[0028] Optionally, a mounting hole is formed at the bottom of the support column for connection with an external device to adjust the angle of the plate straight seam welding fixture relative to the horizontal plane.

[0029] Optionally, the plate straight seam welding fixture further comprises:

[0030] An adjustment hole is formed on the gusset plate and is used to adjust the position of the weld of the pipe in the clamping space 101 relative to the welding gap 102 .

[0031] (III) Beneficial effects

[0032] The beneficial effects of the present invention are as follows: the straight seam welding fixture for plates of the present invention comprises a central axis, a fixed gusset plate and a rotating gusset plate, wherein a clamping space for clamping the plate is formed between the fixed gusset plate and the rotating gusset plate, and when the clamping space is in the second working position, a welding gap for welding is formed at the top of the clamping space, and the pipe is welded through the welding gap at the top of the clamping space. Since the diameter is less than 20 mm, the plate with a tubular diameter less than 20 mm after curling is a small-sized plate. When the pipe in the clamping space is welded through the welding gap, due to the existence of the clamping space, the clamping space can provide support force for the pipe to be welded, and the curled pipe reduces the amplitude of elastic deformation, so small-sized pipes can be welded, and there is no need to add clamps in the pipe during welding, so that welding can be carried out normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the front view structure of an embodiment of the plate straight seam welding fixture of the present invention;

[0034] Figure 2 for Figure 1 Schematic diagram of the cross section at AA in the middle;

[0035] Figure 3 for Figure 1 Schematic diagram of the cross section at the middle BB;

[0036] Figure 4 It is a structural schematic diagram of existing pipe welding for comparative example.

[0037] [Description of Reference Numerals]

[0038] 100, center axis; 101, clamping space; 102, welding gap; 103, adjustment hole; 200, fixed buckle plate; 300, rotating buckle plate; 400, clamp; 500, force-applying mechanism; 501, mounting groove; 510, live bolt; 520, handle; 600, fine-tuning screw; 700, support; 701, mounting hole. DETAILED DESCRIPTION

[0039] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0040] Example:

[0041] like Figures 1 to 3As shown, according to an embodiment of the present application, a straight seam welding fixture for plate materials is proposed, which is used for clamping pipes with a diameter less than 20 mm, and includes: a central axis 100; a fixed clamp plate 200, one side edge of which is fixedly installed on the central axis 100; a rotating clamp plate 300, one side edge of which is rotatably installed on the central axis 100; wherein a clamping space 101 for clamping the pipe to be welded is formed between the fixed clamp plate 200 and the rotating clamp plate 300, and when the angle between the fixed clamp plate 200 and the rotating clamp plate 300 is greater than 0°, the clamping space 101 is the first working position, and when the angle between the fixed clamp plate 200 and the rotating clamp plate 300 is less than or equal to 0°, the clamping space 101 is the second working position; when the clamping space 101 is in the transition to the second working position, a welding gap 102 for welding is formed at the top of the clamping space 101.

[0042] First, before welding the plate into a pipe, the plate is first curled into a pipe with a diameter less than 20 mm. At the same time, the outer diameter of the pipe is equal to the inner diameter of the clamping space 101. The plate is placed in a straight seam welding fixture in the present technical solution for welding. For pipes with a diameter less than 20 mm, the central axis 100 of the fixture plays a key supporting role. The fixed buckle plate 200 is firmly installed on the central axis 100 to ensure a stable position during the clamping process. The rotating buckle plate 300 rotates around the central axis 100 to facilitate the adjustment of the size of the clamping space 101.

[0043] In this technical solution, the straight seam welding fixture for plates in this technical solution is mainly used to clamp pipes with a diameter of less than 20 mm. During operation, when it is necessary to clamp the pipe for welding, the plate is first bent into a tubular shape and placed in a clamping space 101 between the fixed clasp plate 200 and the rotating clasp plate 300 in the first working position; at this time, the angle between the fixed clasp plate 200 and the rotating clasp plate 300 is greater than 0°, and then, by rotating the rotating clasp plate 300, the clamping space 101 is transformed from the first working position to the second working position. In this process, the pipe to be welded is gradually clamped, and when the clamping space 101 is in the second working position, the angle between the fixed clasp plate 200 and the rotating clasp plate 300 is greater than 0°. When the angle between the two is less than or equal to 0°, a welding gap 102 for welding is formed at the top of the clamping space 101. At the same time, the plate is tubular in the clamping space 101. Since the diameter is less than 20 mm, the plate with a tubular diameter less than 20 mm after curling is a small-sized plate. When the plate in the clamping space 101 is welded through the welding gap 102, the clamping space 101 can support the tube in the clamping space 101, so that the curled plate reduces the amplitude of elastic deformation. Therefore, small-sized plates can be welded. During welding, there is no need to add clamps in the tube. It is only necessary to directly blow inert gas to the tube. The inert gas in the tube protects the back of the weld.

[0044] It can be seen from the above content that when the clamping space 101 is in the second working position, the clamping space 101 provides full surface support for the pipe in the clamping space 101, thereby ensuring that when the pipe to be welded is welded, the pipe is stable and there will be no problem of displacement or deformation, thereby effectively improving the welding effect of pipes with a diameter of less than 20 mm.

[0045] like Figures 1 to 3 As shown, in some examples, the straight seam welding fixture for plates further includes: a fixture 400, which is symmetrically and detachably mounted on the end surfaces of the fixed buckle plate 200 and the rotating buckle plate 300 that are close to each other, and the clamping space 101 is arranged between the two fixtures 400.

[0046] In this technical solution, the plate straight seam welding fixture also includes a fixture 400, which is symmetrically and detachably mounted on the end surfaces of the fixed gusset plate 200 and the rotating gusset plate 300 close to each other, and the clamping space 101 is set between the two fixtures 400. This structure makes the plate straight seam welding fixture more flexible to use, and different fixtures 400 can be replaced according to different plate sizes and shapes to meet different welding requirements. For example, when a rectangular pipe needs to be welded, the fixture 400 with a rectangular clamping space can be replaced to ensure that the plate can be firmly clamped in the clamping space 101.

[0047] In addition, the detachable installation of the clamp 400 also makes the maintenance and care of the clamp 400 more convenient. When the clamp 400 is worn or damaged, a new clamp 400 can be replaced in time to ensure the normal use of the clamp. At the same time, the clamp 400 can also be regularly maintained and serviced to extend the service life of the clamp 400.

[0048] like Figures 1 to 3 As shown, in some examples, the plate straight seam welding fixture further includes: pillars 700 installed at both ends of the above-mentioned fixed buckle plate 200.

[0049] In this technical solution, the plate straight seam welding fixture also includes a pillar 700, which is fixedly installed at both ends of the fixed buckle plate 200. The pillar 700 plays a supporting role to ensure that the entire plate straight seam welding fixture remains stable during use. When performing plate clamping and welding operations, a certain force will be generated. If there is no stable support, the fixture may shake or tilt, affecting the welding quality and operational safety.

[0050] For example, the pillar 700 can be fixed and installed by reliable methods such as welding and bolting to ensure that it is firmly connected to the fixed gusset plate 200. At the same time, the material and structural design of the pillar 700 should have sufficient strength and stability to withstand the various forces to which the clamp is subjected during operation. In actual use, the pillar 700 of suitable height and material can be selected according to different working environments and requirements; for example, in situations where a higher operating height is required, a longer pillar 700 can be selected; and in situations where higher stability is required, a pillar 700 with a stronger material and a more stable structure can be selected.

[0051] In addition, in order to further improve the stability of the clamp, an anti-slip pad or a fixing device can be set at the bottom of the pillar 700 to prevent the clamp from moving during operation. At the same time, the pillar 700 can also be surface treated, such as spraying anti-rust paint, to extend its service life.

[0052] like Figures 1 to 3 As shown, in some examples, the plate straight seam welding fixture also includes: a force applying mechanism 500, which is arranged between the above-mentioned fixed buckle plate 200 and the above-mentioned rotating buckle plate 300, and is used to make the above-mentioned fixed buckle plate 200 and the above-mentioned rotating buckle plate 300 relatively fixed when the above-mentioned clamping space 101 is in the second working position.

[0053] In this technical solution, the plate straight seam welding clamp also includes a force-applying mechanism 500, which is arranged between the fixed buckle plate 200 and the rotating buckle plate 300. Its function is to relatively fix the fixed buckle plate 200 and the rotating buckle plate 300 when the clamping space 101 is in the first working position, so that the mutually arranged clamps 400 can fit tightly, thereby ensuring that the plate will not move or deform during the clamping process.

[0054] like Figures 1 to 3 As shown, in some examples, the force-applying mechanism 500 includes: a mounting groove 501 formed at the top of the fixed buckle plate 200 and the rotating buckle plate 300; a movable bolt 510, one end of which is rotatably mounted in the mounting groove 501 at the top of the fixed buckle plate 200 or the rotating buckle plate 300; and a handle 520, which is threadedly mounted on the other end of the movable bolt 510.

[0055] In this technical solution, the force-adding mechanism 500 includes a mounting groove 501, a swing bolt 510 and a handle 520. The mounting groove 501 is formed at the top of the fixed gusset plate 200 and the rotating gusset plate 300, providing a mounting position for the swing bolt 510. One end of the swing bolt 510 is rotatably mounted in the mounting groove 501 at the top of the fixed gusset plate 200 or the rotating gusset plate 300. This rotatable mounting method allows the swing bolt 510 to flexibly adjust its angle during use, making it easy to operate. The handle 520 is threadedly mounted on the other end of the swing bolt 510. By rotating the handle 520, the tightening degree of the swing bolt 510 can be adjusted, so that the fixed gusset plate 200 and the rotating gusset plate 300 are relatively fixed when the clamping space 101 is in the first working position.

[0056] For example, in actual use, when it is necessary to clamp the plate, the curled pipe is placed in the clamping space 101, and then the handle 520 is rotated to gradually tighten the movable bolt 510, and the fixed buckle plate 200 and the rotating buckle plate 300 are brought closer to each other, thereby clamping the pipe; the installation groove 501 can limit the movement range of the movable bolt 510 to ensure that it will not detach from the fixed buckle plate 200 or the rotating buckle plate 300 during use. At the same time, the threaded installation method of the handle 520 can provide a precise adjustment function, so that the clamping force can be adjusted according to the requirements of different plates.

[0057] In addition, in order to improve the stability and durability of the force adding mechanism 500, high-strength materials can be selected to make the hinge bolt 510 and the handle 520, and surface treatments such as zinc plating and chrome plating can be performed on them to prevent rust and corrosion.

[0058] like Figures 1 to 3 As shown, in some examples, the fixed buckle plate 200 and the rotating buckle plate 300 are arranged in a canine-like manner.

[0059] In this technical solution, a canine-tooth cross arrangement is adopted between the fixed clamp plate 200 and the rotating clamp plate 300. Firstly, the canine-tooth cross arrangement can provide a more uniform clamping force when the fixed clamp plate 200 and the rotating clamp plate 300 are clamping the plate, thereby preventing the plate from being deformed or damaged due to excessive local force. At the same time, the uniform clamping force also helps to improve the quality and accuracy of welding and ensure the firmness and smoothness of the weld. Secondly, the canine-tooth cross structure can enhance the stability of the clamp. When the clamp is subjected to external force, the canine-tooth cross parts can bite each other to share and transmit the external force, thereby reducing the deformation and looseness of the clamp. This stability is crucial to ensure the smooth progress of the welding process, especially during long-term or high-intensity welding operations.

[0060] During operation, when it is necessary to clamp the plate, the plate is placed in the clamping space 101, and then the fixed clamp plate 200 and the rotating clamp plate 300 are brought close to each other through the force-applying mechanism 500. Due to the canine-cross arrangement, a stable clamping force is provided to the pipe in the clamping space 101. After welding is completed, the pipe can be easily removed from the clamp by loosening the force-applying mechanism 500.

[0061] In summary, the jigsaw-like arrangement between the fixed gusset plate 200 and the rotating gusset plate 300 can improve the clamping effect, stability and welding quality of the plate straight seam welding fixture, and provide a reliable guarantee for the straight seam welding of the pipe.

[0062] like Figure 1 and Figure 2 As shown, in some examples, the plate straight seam welding fixture further includes: a fine-tuning screw 600, which is disposed between the above-mentioned fixture 400 and the above-mentioned gusset plate, and is used to adjust the distance between the two above-mentioned fixtures 400.

[0063] In this technical solution, the plate straight seam welding fixture also includes a fine-tuning screw 600, which is arranged between the fixture 400 and the gusset plate, and its main function is to adjust the distance between the two fixtures 400. Since there may be errors in component processing or overall assembly of the fixture, when the two gusset plates are close together and the straight seams of the clamped pipes to be welded cannot be tightly fitted, the two gusset plates can be further moved closer to each other by the fine-tuning screw 600, so that the straight seams of the pipes to be welded can be tightly fitted, or the feed of the fine-tuning screw 600 along the travel direction can be pre-adjusted so that when clamped, the two gusset plates are close together so that the straight seams of the clamped pipes to be welded can be tightly fitted.

[0064] For example, during specific use, the operator first roughly adjusts the position of the clamp 400 according to the size of the plate, and then makes precise adjustments by rotating the fine-tuning screw 600 so that the distance between the two clamps 400 is just enough to clamp the plate and ensure that the plate remains stable during welding.

[0065] In addition, in order to facilitate the operator to perform fine-tuning operations, a structure that is easy to rotate, such as a knob, a wrench slot, etc., can be set on the head of the fine-tuning screw 600. At the same time, scale markings can be set on the clamp so that the operator can intuitively understand the distance changes between the clamps 400, thereby improving the accuracy and efficiency of the adjustment.

[0066] like Figure 2 and Figure 3 As shown, in some examples, when the clamping space 101 is in the second working position, the cross-section of the clamping space 101 is circular.

[0067] When it is necessary to clamp the plate for straight seam welding, the plate is placed in the clamping space 101, and then the clamping space 101 is placed in the second working position through the force-applying mechanism 500. At this time, the clamping space 101 with a circular cross-section can provide a uniform clamping force to ensure that the pipe remains stable during the welding process. After welding is completed, the clamping space 101 is restored to the first working position by loosening the force-applying mechanism, and the welded pipe can be easily taken out. The circular cross-sectional structure of the clamping space 101 can provide a uniform clamping force distribution, which provides a reliable guarantee for the straight seam welding of the pipe.

[0068] like Figures 1 to 3 As shown, in some examples, a mounting hole 701 is formed at the bottom of the support 700 for connection with an external device to adjust the angle of the plate straight seam welding fixture relative to the horizontal plane.

[0069] In this technical solution, the mounting hole 701 is used to connect to an external device. Through this connection method, the angle of the plate straight seam welding fixture relative to the horizontal plane can be adjusted. In actual welding work, different welding requirements may require different welding angles. For example, in some special welding scenarios, the plate needs to be tilted at a certain angle for welding to achieve better welding results.

[0070] When the angle needs to be adjusted, the external device (such as an adjustable angle bracket or platform) can be connected to the support 700 through the mounting hole 701. The operator can use the external device to accurately adjust the angle of the fixture according to the specific welding requirements. This adjustment method has high flexibility and accuracy and can meet the needs of various complex welding tasks. In order to ensure the stability and reliability of the connection, the mounting hole 701 can adopt standard sizes and specifications so as to be connected to many different types of external devices.

[0071] During the specific operation process, the operator first determines the required welding angle, then selects a suitable external device and connects it to the mounting hole 701 at the bottom of the support 700; by adjusting the angle setting of the external device, the pipe straight seam welding fixture can reach the required angle; during the welding process, the stability of the plate straight seam welding fixture must be ensured to avoid a decrease in welding quality or safety accidents due to improper angle adjustment.

[0072] To sum up, the mounting hole 701 at the bottom of the pillar 700 provides an interface for connecting the plate straight seam welding fixture to external equipment, so that the fixture can adjust the angle relative to the horizontal plane according to different welding requirements, thereby improving the applicability and flexibility of the fixture and providing a strong guarantee for high-quality plate straight seam welding.

[0073] Exemplarily, an adjustment hole 103 is formed on the gusset plate for adjusting the position of the weld of the pipe in the clamping space 101 relative to the welding gap 102. When the gap to be welded of the pipe in the clamping space 101 and the welding gap 102 are not in the same plane, the pipe in the clamping space 101 can be adjusted through the adjustment hole 103 so that the gap to be welded of the pipe and the welding gap 102 are in the same plane, so that the gap to be welded of the pipe can be welded through the welding gap 102, thereby realizing convenient welding operation.

[0074] For example, in the case of the gusset plate installation clamp 400, the adjustment hole 103 also passes through the clamp 400. When the straight seam of the pipe and the welding gap 102 are not parallel, it is necessary to adjust through the adjustment hole 103, so as to adjust the relative position of the weld seam of the pipe and the welding gap 102 through the adjustment hole 103, thereby facilitating the welding operation.

[0075] Comparative Example:

[0076] See also Figure 4 The existing welding methods for pipes with a diameter greater than 20 mm are as follows: Figure 4 As shown, it includes a bracket 810, a tubular plate 820 is horizontally placed on the top of the bracket 810, a core shaft 830 is arranged inside the tubular plate to support the top of the plate to be welded, and piano-key type pressure plates 840 are arranged on the top of the plate 820 and on both sides of the welding gap. Through the coordinated use of the bracket 810 and the core shaft 830, it is ensured that large-sized pipes can be stably welded by the welding gun 850. Since the core shaft 830 is required to support during welding, the core shaft 830 of the pipe with a diameter less than 20 mm cannot enter the pipe diameter, so that the supporting effect cannot be achieved, and thus welding cannot be achieved.

[0077] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0078] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0080] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0081] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A plate straight seam welding fixture, used for clamping pipes with a diameter less than 20 mm, characterized in that: include: Central axis (100); A fixed gusset plate (200), one side edge of which is fixedly mounted on the central axis (100); A rotating buckle plate (300) is rotatably mounted on one edge of the central shaft (100); Wherein, a clamping space (101) for clamping the pipe to be welded is formed between the fixed gusset plate (200) and the rotating gusset plate (300); when the angle between the fixed gusset plate (200) and the rotating gusset plate (300) is greater than 0°, the clamping space (101) is a first working position; when the angle between the fixed gusset plate (200) and the rotating gusset plate (300) is less than or equal to 0°, the clamping space (101) is a second working position; When the clamping space (101) is in the second working position, a welding gap (102) for welding is formed at the top of the clamping space (101).

2. The plate straight seam welding fixture according to claim 1, characterized in that: Also includes: The clamp (400) is symmetrically and detachably mounted on the end surfaces of the fixed buckle plate (200) and the rotating buckle plate (300) that are close to each other, and the clamping space (101) is arranged between the two clamps (400).

3. The plate straight seam welding fixture according to claim 1, characterized in that: Also includes: The support pillars (700) are installed at both ends of the fixing buckle plate (200).

4. The plate straight seam welding fixture according to claim 1, characterized in that: Also includes: The force-applying mechanism (500) is arranged between the fixed buckle plate (200) and the rotating buckle plate (300), and is used to relatively fix the fixed buckle plate (200) and the rotating buckle plate (300) when the clamping space (101) is in the second working position.

5. The plate straight seam welding fixture as claimed in claim 4, characterized in that: The force adding mechanism (500) comprises: A mounting groove (501) is formed on the top of the fixed buckle plate (200) and the rotating buckle plate (300); A movable bolt (510), one end of which is rotatably mounted in the mounting groove (501) at the top of the fixed buckle plate (200) or the rotating buckle plate (300); The handle (520) is threadedly mounted on the other end of the movable bolt (510).

6. The plate straight seam welding fixture according to claim 1, characterized in that: The fixed buckle plate (200) and the rotating buckle plate (300) are arranged in a canine-like manner.

7. The plate straight seam welding fixture as claimed in claim 2, characterized in that: Also includes: A fine-tuning screw (600) is arranged between the clamp (400) and the gusset plate, and is used to adjust the distance between the two clamps (400).

8. The plate straight seam welding fixture according to claim 1, characterized in that: When the clamping space (101) is in the second working position, the cross section of the clamping space 101 is circular.

9. The plate straight seam welding fixture as claimed in claim 3, characterized in that: The bottom of the support (700) is formed with a mounting hole (701) for connecting with external equipment to adjust the angle of the plate straight seam welding fixture relative to the horizontal plane.

10. The plate straight seam welding fixture according to any one of claims 1 to 9, characterized in that: Also includes: An adjustment hole (103) is formed on the gusset plate and is used to adjust the position of the weld of the pipe in the clamping space (101) relative to the welding gap (102).

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