A quick-release clamp for welding and positioning boiler heating surface tube banks to prevent deformation.

Abstract

This invention relates to the field of tube bank clamping technology, and discloses a quick-fixing clamp for welding and positioning tube banks on boiler heating surfaces, comprising: a support frame with a sliding groove, and four fastening components on the support frame for clamping two straight tubes. Each fastening component includes a base, a fastening plate, a pad, and a driving component. This invention forms a multi-point bottom support structure by setting multiple sets of bases with pads, which can provide all-round support for the butt joint ends of long straight tubes, overcoming the structural defects of traditional clamps that use fixed-point clamping and lack support in the middle section. It effectively counteracts the downward trend caused by the weight of the long tube bank, and eliminates the problems of misalignment of the tube ends and tube body displacement. At the same time, the adjustable fastening plate adaptively conforms to the outer surface of the tube, precisely controlling the clamping force and avoiding tube deformation caused by hard squeezing. This significantly improves the butt welding accuracy of boiler heating surface tube banks from the assembly source.

Description

Technical Field

[0001] This invention relates to the field of tube bank clamping technology, specifically to a quick-release clamp for preventing deformation and positioning of boiler heating surface tube bank welding. Background Technology

[0002] Generally, to prevent misalignment of tube ends and bending / twisting deformation of tube banks during the welding process of boiler heating surfaces, existing boiler processing fields use tube bank welding positioning fixtures. These fixtures are mostly used in the butt welding stations of tube banks on various heating surfaces such as water-cooled walls, economizers, and superheaters. They fix the position of the tubes by limiting and clamping the tube bundles to achieve precise alignment of the tube ends and limit welding deformation.

[0003] To address the aforementioned technical requirements for positioning and preventing deformation during tube bundle welding, the applicant has retrieved relevant existing technologies to achieve the effect of positioning and clamping the heated surface pipes and reducing welding misalignment. For example, patent publication number CN219403030U describes a method where two fasteners are first passed through the pipes to be aligned, then an extruder is hung inside the fasteners, and the fasteners are pre-installed by inserting them into the slots of the fixing components. Subsequently, a push rod is rotated, and the extruder is pushed by a screw-type push rod, relying on the cooperation between the extruder and the fasteners to compress the pipes. The applicant's analysis revealed the following drawbacks to the proposed method of clamping two pipe sections together: the clamp can only perform fixed-point rigid clamping on both sides of the straight pipe to be welded. Long pipe sections are prone to sagging in the middle and misalignment of the pipe ends due to their own weight. In addition, after welding, the weld metal cools and generates shrinkage stress. The rigid and unbuffered locking clamp cannot adapt to the shrinkage deformation of the pipe material, and the restraint stress cannot be released normally. This can easily cause local bending of the pipe bundle and overall warping deformation of the pipe bundle, making it difficult to meet the dimensional accuracy control requirements for large-scale pipe welding. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a quick-release fixture for welding boiler heating surface tube banks to prevent deformation and for positioning, thereby solving the technical problems in the prior art.

[0005] The objective of this invention can be achieved through the following technical solutions: A quick-release clamp for welding and positioning boiler heating surface tube banks to prevent deformation, comprising: A support frame is provided with a sliding groove. Four fastening components are provided on the support frame for clamping two straight tubes. Each fastening component includes a base, a fastening plate, a pad, and a drive component. One base is fixedly installed on the support frame, and three bases are slidably installed in the sliding groove. The pad is fixedly installed on the top of the base, and the fastening plate is slidably installed on the base. The fastening plate is driven to move up and down by the drive component. A straight tube is clamped and fixed between the fastening plate and the pad. A fixing plate is fixedly installed on the support frame. The fixing plate is connected to a base via a tension spring. The preload of the tension spring causes the base to move toward the fixing plate, and the fixing plate moves away from the base fixedly installed on the support frame.

[0006] As a further embodiment of the present invention: each of the driving components includes a cavity, a lifting plate, a slot and a first screw. The cavity is opened in the base, the lifting plate is slidably installed in the cavity, the first screw is rotatably installed in the cavity, the first screw is threadedly connected to the lifting plate, and the bottom end of the first screw extends to the bottom of the base. The first screw is driven to rotate by a first output source. The slot is opened on both sides of the fastening plate, and the slot is slidably assembled with the lifting plate.

[0007] As a further aspect of the present invention: each of the slots is provided with a groove, a limit block is slidably installed in the groove, a second screw is rotatably installed at the bottom end of the fastening plate, the second screw is driven to rotate by a second output source, the second screw is threadedly connected to the fastening plate, the top end of the second screw extends into the groove, and the top end of the second screw is rotatably connected to the bottom end of the limit block, when the limit block rises into the slot, the limit block abuts against the lifting plate.

[0008] As a further embodiment of the present invention: three bases slidably mounted on the slide groove are respectively fixedly mounted with a second bracket, a third bracket and a first bracket. The third bracket and the tension spring are both fixedly mounted on the same base. A second lock hole and a third lock hole are respectively opened at one end of the second bracket and the third bracket. Two first lock holes are opened in the first bracket. The two first lock holes are aligned with the second lock hole and the third lock hole respectively. A rod is slidably installed in each of the two first lock holes. The two rods are driven to move by a linkage component. When the linkage component drives one rod to insert into the second lock hole, the other rod retracts into the first lock hole. The first bracket and the second bracket are rigidly connected.

[0009] As a further embodiment of the present invention: the linkage component includes a toothed groove and a gear. The toothed groove is provided on both of the two insert rods. The gear is rotatably installed in the first bracket and is located between the two insert rods. The gear meshes with the toothed grooves on the two insert rods. The gear is driven to rotate by a power component.

[0010] As a further aspect of the present invention: the linkage component further includes a second telescopic member, which is fixedly installed at the bottom of the first bracket, and the movable end of the second telescopic member is fixedly connected to one of the plug rods.

[0011] As a further aspect of the present invention: a first telescopic member is fixedly installed inside the bearing frame, the movable end of the first telescopic member is fixedly connected to the base, and the base is fixedly connected to the second bracket.

[0012] As a further embodiment of the present invention: an opening is provided at the top of one of the fastening plates.

[0013] The beneficial effects of this invention are: 1. In this invention, by setting multiple sets of bases with pads to form a multi-point bottom support structure, the joint end of long straight pipes can be supported in all directions. This overcomes the structural defects of traditional clamps that hold at fixed points and have no support in the middle section. It effectively counteracts the downward trend caused by the weight of the long pipe bank and eliminates the problems of misalignment of the pipe ends and pipe body displacement. At the same time, the adjustable fastening plate adapts to the outer surface of the pipe body and precisely controls the clamping force to avoid pipe deformation caused by hard squeezing. This greatly improves the welding accuracy of the joint of the boiler heating surface pipe bank from the assembly source. 2. In this invention, by setting a tension spring between the movable end base and the fixed plate to form an elastic buffer structure, the traditional clamping method of rigid locking is abandoned. When the weld cools and generates axial shrinkage stress, the movable end base can be adaptively and synchronously slid with the shrinkage of the pipe body by relying on the sliding groove. The elastic deformation of the tension spring can relieve the residual restraint stress of welding, thus solving the core problem that traditional clamps cannot adapt to the shrinkage deformation of the pipe and the stress accumulation leads to the bending, warping and twisting deformation of the pipe. 3. In this invention, a switchable rigid linkage structure is formed by the first bracket, the second bracket, and the third bracket in conjunction with the insertion rod. The linkage state of the movable base can be quickly switched according to different working conditions such as joint displacement and cooling buffer, so as to realize the overall stable displacement of the pipe body and synchronous deformation of welding shrinkage. At the same time, with the detachable fastening plate structure, the clamp can be disassembled and assembled without the need to pull the pipe laterally. It is suitable for complex working conditions with straight pipe ends with bends, avoids secondary deformation caused by pulling the pipe body during disassembly and assembly, and improves the adaptability of the clamp and the stability of pipe welding processing. Attached Figure Description

[0014] The invention will now be further described with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the tension spring in this invention; Figure 3 This is a schematic diagram of the structure of the first support in this invention; Figure 4 This is a cross-sectional structural schematic diagram of the first support in this invention; Figure 5 In this invention Figure 2 Enlarged structural diagram of the middle section; Figure 6 This is a schematic diagram of the base structure in this invention; Figure 7 This is a cross-sectional structural diagram of the base in this invention; Figure 8 This is a schematic diagram of the opening structure in this invention.

[0016] In the diagram: 1. Bearing frame; 101. Slide groove; 2. Fastening assembly; 3. Base; 301. Cavity; 4. Fastening plate; 401. Opening; 5. Pad; 6. Straight tube; 7. Lifting plate; 8. Slot; 801. Groove; 9. First screw; 10. Limiting block; 11. Second screw; 12. Fixing plate; 13. Tension spring; 14. First telescopic component; 15. First bracket; 1501. First locking hole; 16. Second bracket; 1601. Second locking hole; 17. Third bracket; 1701. Third locking hole; 18. Insert rod; 19. Gear groove; 20. Gear; 21. Second telescopic component. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-8 As shown, the present invention is a quick-release fixture for welding and positioning boiler heating surface tube banks to prevent deformation, comprising: A support frame 1 is provided with a sliding groove 101. Four fastening components 2 are provided on the support frame 1. The four fastening components 2 are used to clamp two straight pipes 6. Each fastening component 2 includes a base 3, a fastening plate 4, a pad 5, and a driving component. One base 3 is fixedly installed on the support frame 1, and all three bases 3 are slidably installed in the sliding groove 101. The pad 5 is fixedly installed on the top of the base 3. The fastening plate 4 is slidably installed on the base 3. The fastening plate 4 is driven to rise and fall by the driving component. The straight pipe 6 is clamped and fixed between the fastening plate 4 and the pad 5. A fixing plate 12 is fixedly installed on the support frame 1. The fixing plate 12 is connected to a base 3 by a tension spring 13. The preload of the tension spring 13 causes the base 3 to move toward the fixing plate 12, and the fixing plate 12 moves away from the base 3 fixedly installed on the support frame 1.

[0019] The working principle of this invention: Figure 2 As shown in the example, the four groups of bases 3 are, from left to right, the first group, the second group, the third group, and the fourth group, respectively. Figure 3As shown in the example, the first bracket 15 is fixedly connected to the fourth set of bases 3, the second bracket 16 is fixedly connected to the second set of bases 3, and the third bracket 17 is fixedly connected to the third set of bases 3. During the pipe alignment assembly stage, the workers slide and adjust the second and fourth sets of bases 3 to the right. Then, they place the ends of the two straight pipes 6 to be joined on the pads 5 of the third set of bases 3. Then, they manually align the ends of the two straight pipes 6 to be welded, forming a ring-shaped weld seam. Relying on the bottom support of the pads 5, the joint ends of the two straight pipes 6 are supported, effectively preventing the long straight pipes 6 from sagging, misaligning, or shifting due to their own weight. This helps the workers quickly complete the precise alignment of the two straight pipes 6. After the pipe alignment accuracy meets the standard, the joint ends are then aligned. Figure 8 As shown, the drive components on the second and fourth sets of bases 3 are manipulated respectively to drive the corresponding fastening plates 4 to descend, cooperating with the pads 5 at the top of the base 3 to firmly clamp and fix the two straight pipes 6, achieving rigid positioning of the pipes. After the straight pipes 6 are clamped, positioned, and precisely aligned, the second and fourth sets of bases 3, which have been slid-adjusted, are moved to the left to reset. At this time, the third set of bases 3 is stationary, causing the butt weld of the two straight pipes 6 to be shifted to the suspended area between the second and third sets of bases 3. Figure 1 As shown, the drive components on the first and third sets of bases 3 are then manipulated to drive the corresponding fastening plates 4 to descend, which cooperate with the pads 5 at the top of the bases 3 to firmly clamp and fix the two straight pipes 6. At this time, the fastening plates 4 and pads 5 on the four sets of bases 3 clamp and fix the straight pipes 6, providing sufficient and unobstructed operating space for subsequent ring welding operations, greatly improving the convenience of welding operations.

[0020] During the welding operation and weld cooling stage, the high temperature of welding will cause the pipe to expand thermally. After the weld cools down, axial shrinkage stress will be generated. Traditional rigid clamps will completely lock the pipe displacement, resulting in the shrinkage stress not being released, which will cause defects such as pipe twisting, deformation, and misalignment. In this device, the third set of bases 3 is elastically connected to the fixed plate 12 on the bearing frame 1 through the tension spring 13. When the weld cools down and generates axial shrinkage stress, the two straight pipes 6 will adaptively pull the third and fourth sets of movable end bases 3 along the slide groove 101 to slide synchronously, while stretching the tension spring 13. The elastic deformation of the tension spring 13 buffers and releases the shrinkage stress generated by the weld cooling, realizing the pipe body's unrestrained adaptive deformation, avoiding the problem of pipe deformation from the root, until the weld is completely cooled and shaped, completing the overall welding operation.

[0021] like Figures 1-7As shown, in a preferred embodiment of the present invention, each of the drive components includes a cavity 301, a lifting plate 7, a slot 8, and a first screw 9. The cavity 301 is formed within the base 3, the lifting plate 7 is slidably installed within the cavity 301, the first screw 9 is rotatably installed within the cavity 301, the first screw 9 is threadedly connected to the lifting plate 7, and the bottom end of the first screw 9 extends below the base 3. The first screw 9 is driven to rotate by a first output source. The slot 8 is formed on both sides of the fastening plate 4, and the slot 8 is slidably assembled with the lifting plate 7.

[0022] In one embodiment, the first output source can be manually driven or other mechanisms capable of rotational motion. This embodiment does not impose any specific limitations on this.

[0023] In practical application, the first output source drives the first screw 9 to rotate, which drives the lifting plate 7 to slide vertically along the cavity 301 of the base 3 through threaded transmission. The sliding assembly relationship between the lifting plate 7 and the slots 8 on both sides of the fastening plate 4 allows the lifting plate 7 to simultaneously drive the fastening plate 4 to rise and fall as a whole, thereby adjusting the clamping distance between the fastening plate 4 and the pad 5, and realizing the clamping and loosening of the straight tube 6. It should be noted that the inner arc surface of the fastening plate 4 is in contact with the straight tube 6, and the top of the pad 5 is concave, which can also directly contact the outer circular surface of the straight tube 6. This structure can precisely control the clamping force, ensuring that the clamping process is in contact with the tube surface and the positioning is stable.

[0024] like Figures 1-7 As shown, in a preferred embodiment of the present invention, each slot 8 is provided with a groove 801, and a limiting block 10 is slidably installed in the groove 801. A second screw 11 is rotatably installed at the bottom end of the fastening plate 4. The second screw 11 is driven to rotate by a second output source. The second screw 11 is threadedly connected to the fastening plate 4. The top end of the second screw 11 extends into the groove 801, and the top end of the second screw 11 is rotatably connected to the bottom end of the limiting block 10. When the limiting block 10 rises into the slot 8, the limiting block 10 abuts against the lifting plate 7.

[0025] In one embodiment, the second output source can be manually driven or other mechanisms capable of rotational motion. This embodiment does not impose any specific limitations on this.

[0026] In practical application, the second output source drives the second screw 11 to rotate, which drives the limiting block 10 to slide vertically along the inside of the groove 801 through the threaded transmission. When the limiting block 10 moves upward and extends into the slot 8, the limiting block 10 and the lifting plate 7 form an abutment limit, restricting the lateral displacement of the fastening plate 4, ensuring that the tube body is positioned without deviation under clamping conditions, and improving the welding positioning accuracy. After the welding operation is completed, the second screw 11 is driven in the opposite direction to drive the limiting block 10 to move downward and retract to release the limit. Since one end of the slot 8 is open, the fastening plate 4 can be directly slid and separated from the outside of the lifting plate 7 without having to pull the straight pipe 6 out laterally from the clamping gap. This is suitable for the actual working condition where the end of the straight pipe 6 is connected to a bent pipe in the pipe row, avoiding the problem that traditional integral clamps cannot adapt to pipe rows with bent pipes and are difficult to disassemble and assemble, causing secondary deformation.

[0027] like Figures 1-8 As shown, in a preferred embodiment of the present invention, a second bracket 16, a third bracket 17, and a first bracket 15 are respectively fixedly installed at the bottom of the three bases 3 slidably mounted on the slide groove 101. The third bracket 17 and the tension spring 13 are both fixedly installed on the same base 3. A second locking hole 1601 and a third locking hole 1701 are respectively opened at one end of the second bracket 16 and the third bracket 17. Two first locking holes 1501 are opened in the first bracket 15. The two first locking holes 1501 are aligned with the second locking holes 1601 and the third locking holes 1701 respectively. Insert rods 18 are slidably installed in the two first locking holes 1501. The two insert rods 18 are driven to move by the linkage component. When the linkage component drives one insert rod 18 to insert into the second locking hole 1601, the other insert rod 18 retracts into the first locking hole 1501. The first bracket 15 and the second bracket 16 are rigidly connected.

[0028] In practical application, during the pipe alignment and weld relocation process, the second and fourth sets of bases 3 are first slid and adjusted to the right. The two straight pipes 6 to be joined are placed together on the pad 5 at the top of the third set of bases 3. The initial alignment of the two straight pipes 6 is achieved by relying on the bottom support of the pad 5. After alignment, the two straight pipes 6 are clamped and fixed by the fastening plates 4 and pads 5 above the second and fourth sets of bases 3 to ensure that the pipes do not loosen or shift. Then, the linkage component controls the movement of the insertion rod 18, causing one of the insertion rods 18 on the first bracket 15 to extend and insert into the second locking hole 1601 of the second bracket 16, while the other insertion rod 18 retracts and resets, forming a rigid connection between the first bracket 15 and the second bracket 16, thereby enabling the corresponding two sets of... The movable base 3 forms an integrated synchronous structure. At this time, the sliding adjustment base 3 can synchronously drive the two sets of movable base 3 to move smoothly through the rigid connection structure, thereby making the corresponding two sets of movable base 3 form an integrated synchronous structure. At this time, the sliding adjustment of the second set of base 3 can synchronously drive the fourth set of base 3 to move smoothly through the rigid connection structure. The fasteners 4 and pads 5 on the second and fourth sets of base 3 respectively fix and clamp the two straight pipes 6, thus driving the two straight pipes 6 to move as a whole after being clamped and fixed, accurately moving the butt joint circumferential weld of the two straight pipes 6 to the suspended welding area between the second set of base 3 and the third set of base 3. This synchronous linkage structure can completely avoid the pipe body displacement and pipe mouth misalignment caused by manually pushing and pulling a single set of base 3, ensuring the pipe body alignment accuracy and structural stability throughout the process.

[0029] After the weld seam of straight pipe 6 is moved into place, as follows Figure 3 and Figure 4 Taking the example shown, at this time, the two first locking holes 1501 of the first bracket 15 are precisely aligned with the second locking hole 1601 and the third locking hole 1701, respectively. At this time, the working state of the two insertion rods 18 is switched by the linkage component, the insertion rod 18 inserted into the second locking hole 1601 is withdrawn and retracted to its original position, and at the same time, the other insertion rod 18 is driven to extend and insert into the third locking hole 1701 of the third bracket 17, thereby releasing the connection between the first bracket 15 and the second bracket 16, and establishing a rigid connection between the first bracket 15 and the third bracket 17, so that the two sets of bases 3 on the movable side are then... Once the overall linkage structure is formed, after entering the welding operation and weld cooling stage, the straight pipe 6 generates axial shrinkage stress during welding and cooling, and the pipe body undergoes adaptive shrinkage displacement. At this time, the two straight pipes 6 can stably drive the fastening plate 4, pad 5 and base 3 to move synchronously, thereby driving the base 3 connected to the third support 17 to slide and stretch the tension spring 13. Through the rigid linkage between the first support 15 and the third support 17, the two sets of movable bases 3 on the right side can slide synchronously throughout the entire process, and there will be no situation where a single set of bases 3 slides independently, effectively ensuring that the overall force of the pipe row is uniform.

[0030] like Figures 3-4As shown, in a preferred embodiment of the present invention, the linkage component includes a toothed groove 19 and a gear 20. The two insert rods 18 are provided with toothed grooves 19. The gear 20 is rotatably mounted in the first bracket 15 and is located between the two insert rods 18. The gear 20 meshes with the toothed grooves 19 on the two insert rods 18. The gear 20 is driven to rotate by a power component.

[0031] In one embodiment, the power component can be a servo motor, a servo motor or other components that can achieve rotational motion. This embodiment does not impose any specific limitations on this component.

[0032] In practical application, the power component drives the gear 20 to rotate. The gear 20, through meshing with the toothed grooves 19 on both sides, drives the two insertion rods 18 to move linearly in opposite directions, achieving a linkage switching effect where one insertion rod 18 extends and locks while the other insertion rod 18 retracts and unlocks. This linkage structure can achieve precise and rapid switching between the connection states of the two sets of bases 3, ensuring orderly switching between displacement feeding and welding shrinkage buffering conditions. The action synchronization is high, and the positioning is without deviation, avoiding displacement errors caused by manual switching and locking, and further ensuring the accuracy of pipe welding.

[0033] like Figures 1-4 As shown, in a preferred embodiment of the present invention, the linkage component further includes a second telescopic member 21, which is fixedly installed at the bottom of the first bracket 15, and the movable end of the second telescopic member 21 is fixedly connected to one of the plug rods 18.

[0034] In one embodiment, the second telescopic member 21 can be an electric cylinder, an electric telescopic rod, or other components that can achieve linear reciprocating motion. This embodiment does not impose specific limitations on these components.

[0035] In practical application, the second telescopic component 21 can directly drive the corresponding insertion rod 18 to complete the telescopic action. In conjunction with the linkage structure of gear 20 and tooth groove 19, the locking and unlocking states of the insertion rod 18 can be stably switched, improving the automation level and action stability of the rigid connection switching of the base 3. This ensures that the fixture can switch smoothly in each process of alignment, welding, and cooling without jamming or displacement, continuously ensuring the stability of the pipe row clamping and positioning, and avoiding deformation defects caused by working condition switching errors.

[0036] like Figures 1-3 As shown, in a preferred embodiment of the present invention, a first telescopic member 14 is fixedly installed inside the bearing frame 1. The movable end of the first telescopic member 14 is fixedly connected to the base 3, and the base 3 is fixedly connected to the second bracket 16.

[0037] In one embodiment, the first telescopic member 14 may be an electric cylinder, an electric telescopic rod, or other components that can achieve linear reciprocating motion. This embodiment does not impose specific limitations on these components.

[0038] In practical application, during equipment operation, the first telescopic member 14 can output a linear driving force to directly pull the connected base 3 along the slide groove 101 for precise sliding. When the second bracket 16 and the first bracket 15 are rigidly locked together by the plug rod 18, the two sets of movable bases 3 form an integrated linkage structure. The first telescopic member 14 can then synchronously drive the two sets of movable bases 3 to move as a whole, eliminating the need for manual pushing and pulling adjustments and achieving automated and stable displacement of the base 3.

[0039] like Figures 1-5 As shown, in a preferred embodiment of the present invention, an opening 401 is provided at the top of one of the fastening plates 4.

[0040] In practical application, this embodiment refers to the following during the initial stage of straight pipe 6-way assembly: Figure 8 As shown, the two straight pipes 6 to be connected are respectively placed between the fastening plates 4 and the pads 5. The pads 5 form a stable bottom support. The staff can directly observe the connection status of the two straight pipes 6 through the opening 401 at the top of the fastening plate 4, check the flatness of the pipe end face and the radial alignment accuracy in real time, and make timely fine adjustments to the position of the pipe. Under the premise of ensuring stable support at the bottom of the pipe, the difficulty of pipe alignment is greatly reduced and the connection assembly accuracy is improved.

[0041] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A quick-release clamp for welding and positioning boiler heating surface tube banks to prevent deformation, characterized in that, include: A support frame (1) is provided with a sliding groove (101). Four fastening components (2) are provided on the support frame (1). The four fastening components (2) are used to clamp two straight tubes (6). Each fastening component (2) includes a base (3), a fastening plate (4), a pad (5) and a drive component. One base (3) is fixedly installed on the support frame (1). All three bases (3) are slidably installed in the sliding groove (101). The pad (5) is fixedly installed on the top of the base (3). The fastening plate (4) is slidably installed on the base (3). The fastening plate (4) is driven by the drive component to lift and lower. The straight tube (6) is clamped and fixed between the fastening plate (4) and the pad (5). A fixing plate (12) is fixedly installed on a support frame (1). The fixing plate (12) is connected to a base (3) by a tension spring (13). The tension spring (13) has a preload force that causes the base (3) to move toward the fixing plate (12) and the fixing plate (12) to move away from the base (3) fixedly installed on the support frame (1).

2. The quick-release fixture for welding and positioning boiler heating surface tube banks according to claim 1, characterized in that, Each of the drive components includes a cavity (301), a lifting plate (7), a slot (8), and a first screw (9). The cavity (301) is opened in the base (3). The lifting plate (7) is slidably installed in the cavity (301). The first screw (9) is rotatably installed in the cavity (301). The first screw (9) is threadedly connected to the lifting plate (7), and the bottom end of the first screw (9) extends to the bottom of the base (3). The first screw (9) is driven to rotate by a first output source. The slot (8) is opened on both sides of the fastening plate (4). The slot (8) is slidably assembled with the lifting plate (7).

3. A quick-release fixture for welding and positioning boiler heating surface tube banks according to claim 2, characterized in that, Each slot (8) has a groove (801) in which a limit block (10) is slidably installed. A second screw (11) is rotatably installed at the bottom of the fastening plate (4). The second screw (11) is driven to rotate by the second output source. The second screw (11) is threadedly connected to the fastening plate (4). The top end of the second screw (11) extends into the groove (801) and is rotatably connected to the bottom end of the limit block (10). When the limit block (10) rises into the slot (8), the limit block (10) abuts against the lifting plate (7).

4. A quick-release fixture for welding and positioning boiler heating surface tube banks according to claim 1, characterized in that, Three bases (3) slidably mounted on the slide groove (101) are respectively fixedly mounted with a second bracket (16), a third bracket (17) and a first bracket (15) at their bottom ends. The third bracket (17) and the tension spring (13) are both fixedly mounted on the same base (3). A second locking hole (1601) and a third locking hole (1701) are respectively opened at one end of the second bracket (16) and the third bracket (17). Two first locking holes (1501) are opened in the first bracket (15). The first lock hole (1501) is aligned with the second lock hole (1601) and the third lock hole (1701) respectively, and a plug rod (18) is slidably installed in both of the first lock holes (1501). The two plug rods (18) are driven to move by the linkage component. When the linkage component drives one plug rod (18) to insert into the second lock hole (1601), the other plug rod (18) retracts into the first lock hole (1501). The first bracket (15) and the second bracket (16) establish a rigid connection.

5. A quick-release fixture for welding and positioning boiler heating surface tube banks according to claim 4, characterized in that, The linkage component includes a toothed groove (19) and a gear (20). The two insert rods (18) are provided with toothed grooves (19). The gear (20) is rotatably installed in the first bracket (15) and is located between the two insert rods (18). The gear (20) meshes with the toothed grooves (19) on the two insert rods (18). The gear (20) is driven to rotate by a power component.

6. A quick-release fixture for welding and positioning boiler heating surface tube banks according to claim 5, characterized in that, The linkage component also includes a second telescopic component (21), which is fixedly installed at the bottom of the first bracket (15), and the movable end of the second telescopic component (21) is fixedly connected to one of the plug rods (18).

7. A quick-release fixture for welding and positioning boiler heating surface tube banks according to claim 4, characterized in that, The first telescopic component (14) is fixedly installed inside the bearing frame (1). The movable end of the first telescopic component (14) is fixedly connected to the base (3), and the base (3) is fixedly connected to the second bracket (16).

8. A quick-release fixture for welding and positioning boiler heating surface tube banks according to claim 7, characterized in that, An opening (401) is provided at the top of one of the fastening plates (4).

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