A device and method for welding flanges of supercritical spiral water-cooled wall tube panels

Abstract

The present invention discloses a device and method for welding flanges of a supercritical spiral water-cooled wall tube panel, comprising a back-fire side flange fixing device, an anti-displacement hook, a wedge-shaped connection device, a fire-facing side support member, a connecting screw member, a tightening bolt, and a compacting steel section. The back-fire side flange fixing device is connected to the fire-facing side support member via a wedge-shaped connection device. The anti-displacement hook is located on one side of the back-fire side flange fixing device. The connecting screw is used to connect and fix two or more back-fire side flange fixing devices. The compacting steel section is respectively placed on the upper part of the flange and the upper part of the back-fire side tube panel. The tightening bolt plays a role of compression and fixing in the entire device. The device of the present invention does not block or interfere with the welding area, ensuring that there is sufficient space for welding technicians to perform welding. It can prevent deformation of the spiral water-cooled wall tube panel flange during welding, avoid secondary deformation of the already welded tube panel and welding flange, and improve product quality.

Description

Technical Field

[0001] This invention relates to the field of welding and assembling flanges for water-cooled wall tubes, and more specifically, to an apparatus and method for welding and assembling flanges for supercritical spiral water-cooled wall tubes. Background Technology

[0002] The supercritical spiral water-cooled wall tube panel has a unique structure. Each burner nozzle has an independent raised cooling chamber, and the unexposed side has a raised membrane tube panel. The two sides of the tube panel have "V"-shaped openings. Flanges need to be welded around the raised tube panel walls. The inner side of the flange is very close to the raised membrane tube wall, making welding impossible. Therefore, welding can only be done on the outer side of the flange. In addition, the spiral water-cooled wall tube panel is long and the flange itself has a lateral bend, resulting in severe welding deformation during the welding process. The direction of deformation is unpredictable. This welding deformation not only affects the welding quality of the flange and tube panel but also causes secondary deformation of the already welded flange and tube panel.

[0003] Currently, when welding flanges on supercritical spiral water-cooled wall tube panels, no external force is applied to effectively control welding deformation. Multiple welders are used to control welding deformation by intermittent welding in small areas. Furthermore, due to the different qualifications of welding technicians, the difference in welding skills can have a significant impact on the quality of the weld. Even if the same welding technician operates the weld, uncontrollable external factors such as current fluctuations can cause changes in the quality of the weld.

[0004] Therefore, improving welding quality and ensuring product quality and performance has become a major issue. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an apparatus and method for welding flanges to a supercritical spiral water-cooled wall tube screen. This apparatus and method solve the problem of poor welding quality between the flange and the supercritical spiral water-cooled wall tube screen.

[0006] The embodiments of the present invention are achieved through the following technical solutions:

[0007] A device for welding flanges of supercritical spiral water-cooled wall tubes includes a flange and a supercritical spiral water-cooled wall tube. The device for welding flanges of supercritical spiral water-cooled wall tubes also includes a back-fire flange fixing device, an anti-displacement hook, a wedge-shaped connection device, a fire-facing support, and tightening bolts.

[0008] The back-fired flange fixing device is located on the outer side of the flange;

[0009] The wedge-shaped connection device is located below the back-fired flange fixing device;

[0010] The fire-facing support is connected to the wedge-shaped connecting device;

[0011] These tightening bolts are used for multi-directional clamping and fixing of flanges and supercritical spiral water-cooled wall panels.

[0012] In one embodiment of the present invention, the back-fire flange fixing device is provided with an unequal-length U-shaped mechanism, the unequal-length U-shaped mechanism is provided with a first bolt hole, a first waist-shaped hole, a connecting hole and a pin hole, and a first wedge-shaped groove connecting block is welded to the bottom of the unequal-length U-shaped mechanism.

[0013] In one embodiment of the present invention, the anti-displacement hook includes a hook, a pin, a cotter pin, and a U-shaped block. The U-shaped block is connected to the unexposed flange fixing device, and both are provided with through pin holes. The hook is hinged to the cotter pin, the cotter pin is connected to the U-shaped block, and the pin is inserted into the pin holes of the U-shaped block and the unexposed flange fixing device.

[0014] In one embodiment of the present invention, the wedge-shaped connecting device includes a wedge-shaped sliding block and a tightening bolt. The wedge-shaped sliding block has a second oblong hole in the middle, and the tightening bolt is inserted into the oblong hole, and the tightening bolt can slide along the oblong hole.

[0015] In one embodiment of the present invention, the fire-facing support includes an unclosed annular mechanism, a second wedge-shaped groove connecting block welded to the unclosed annular mechanism, and a tube screen support plate welded to the unclosed annular mechanism, wherein the unclosed annular mechanism is provided with a plurality of second bolt holes.

[0016] In one embodiment of the present invention, the fire-facing support and the unfacing flange fixing device are connected as a whole by a wedge-shaped connecting device.

[0017] In one embodiment of the present invention, the connecting hole is equipped with a connecting screw, which includes a screw and a nut.

[0018] In one embodiment of the present invention, the back-fire flange fixing device is provided with an angle steel, which is also provided with a clamping groove, and the groove is connected to a hook; the fire-facing support is provided with a channel steel, which is provided with a groove, and the groove is connected to an unclosed ring mechanism.

[0019] A method for welding flanges of a supercritical spiral water-cooled wall tube panel, comprising the following steps:

[0020] S1: Set an appropriate installation pitch according to the actual length and width of the flange, and then place the compaction steel on the upper part of the flange and the upper part of the back-fired pipe panel respectively.

[0021] S2: Insert the fire-facing support into the spiral tube screen and tighten the bolts in the corresponding holes;

[0022] S3: Tighten the flange and compact the angle steel with anti-displacement hooks, and fix them with pins;

[0023] S4: After adjusting the position of each component, tighten all the screw nuts on the above-mentioned device.

[0024] In one embodiment of the present invention, in step S2 above, the fire-facing support is first fitted into the tube screen, so that the tube screen support plate in the fire-facing support is close to the fire-facing tube screen, and the unfire-facing side passes through the groove of the pre-placed compacted channel steel and is tightened with bolts. Then, the wedge-shaped connecting device and the unfire-facing flange fixing device are installed in sequence, ensuring that the cross-sectional area of ​​the three is perpendicular to the flange.

[0025] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0026] The embodiments of the present invention do not obstruct or interfere with the welding area, ensuring sufficient space for welding technicians to perform welding. This can prevent deformation during the assembly and welding of spiral water-cooled wall tube panel flanges, avoid secondary deformation of already assembled tube panels and welding flanges, and improve product quality. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a front view structural diagram of the present invention;

[0029] Figure 2 This is a rear view schematic diagram of the structure after removing the supercritical spiral water-cooled wall tube screen in this invention;

[0030] Figure 3 This is a front view schematic diagram of the structure in this invention with the supercritical spiral water-cooled wall tube screen removed;

[0031] Figure 4 This is a side view of the structure of removing the supercritical spiral water-cooled wall tube screen in this invention.

[0032] Icons: 1-Flange, 2-Supercritical spiral water-cooled wall tube panel, 3-Connecting screw, 4-Unequal length U-shaped mechanism, 5-Tightening bolt, 6-First oblong hole, 7-Channel steel, 8-Hook, 9-Cooling pin, 10-Pin, 11-Angle steel, 12-Wedge sliding block, 13-Second oblong hole, 14-Unclosed ring mechanism, 15-Tube panel support plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this invention, it should be noted that if terms such as "inner" or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0037] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "configure," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Please refer to Figure 1-4This embodiment provides a device structure for welding a flange 2 of a supercritical spiral water-cooled wall tube panel. It includes a back-facing flange fixing device, an anti-displacement hook, a wedge-shaped connecting device, a fire-facing support, a connecting screw 3, a tightening bolt 5, a compacted steel section, a flange 1, and a supercritical spiral water-cooled wall tube panel 2. The back-facing flange fixing device is positioned above and on the outside of the flange 1 to be welded, and is used to fix and tighten the top plane of the flange 1 and prevent the flange 1 from shifting or tipping towards the tube panel side. One end of the anti-displacement hook hooks onto the inner edge of the flange 1 and passes around the upper surface of the flange 1 to connect with the back-facing flange fixing device. This anti-displacement hook is used to fix the position of the flange 1. The wedge-shaped connecting device is positioned below the back-facing flange fixing device and is used for... The system connects the back-fire flange fixing device and the fire-facing support; the fire-facing support is located between the fire-facing and back-fire surfaces of the supercritical spiral water-cooled wall tube panel 2, and is used to support and compress the tube panel; the connecting screw 3 is located between two or more back-fire flange fixing devices, and is used to connect and limit the back-fire flange fixing devices; the tightening bolt 5 is provided according to the back-fire flange fixing device, wedge-shaped connecting device, fire-facing support, connecting screw 3, and compaction steel, and is used to compress and fix the flange 1 and the supercritical spiral water-cooled wall tube panel 2 in multiple directions; the compaction steel is located on the upper surface of the flange 1 and the horizontal plane of the back-fire surface of the tube panel, and the rigidity and flatness of the steel itself, together with the tightening bolt 5, ensure the flatness of the flange 1 and the supercritical spiral water-cooled wall tube panel 2.

[0039] Furthermore, the unexposed flange fixing device is an unequal-length U-shaped mechanism 4. This unequal-length U-shaped mechanism 4 has a first bolt hole, a first oblong hole 6, a fixing hole, a connecting hole, and a pin hole. A first wedge-shaped groove connecting block is welded to the bottom of the unequal-length U-shaped mechanism 4. This first wedge-shaped groove connecting block is located on a wedge-shaped connecting device, and the wedge-shaped connecting device is slidably connected to the first wedge-shaped groove connecting block. The first bolt hole is used in conjunction with the tightening bolt 5 to apply a vertically downward force to the flange 1. The fixing hole is used in conjunction with the tightening bolt 5 to apply a vertically upward force to the flange 1. By providing the first bolt hole and the fixing hole, the force on the flange 1 in the vertical direction is balanced. The connecting hole is used in conjunction with the connecting screw 3, allowing two or more unexposed flange fixing devices to be located on the same horizontal line, defining the position of the unexposed flange fixing devices. The first oblong hole 6 has a tightening bolt 5, which can be adjusted according to the height of the flange 1, and the tightening bolt 5 can apply a horizontal inward force to the flange 1. The anti-displacement hook includes a hook 8, a pin 10, a cotter pin 9, and a U-shaped block. The U-shaped block is connected to the back-facing flange fixing device, and both have through pin holes. The hook 8 is hinged to the cotter pin 9, and the cotter pin 9 is connected to the U-shaped block. The pin 10 is inserted into the pin holes of the U-shaped block and the back-facing fixing device. The installation method using the pin 10 insertion facilitates the disassembly of the device. By hooking the inside of the flange 1 with the hook 8, a horizontal outward force is applied to the flange 1, so that the flange 1 is subjected to balanced forces in the horizontal direction. Because the flange 1 is subjected to balanced forces in the horizontal and vertical directions, the flange 1 can be more stably installed on the supercritical spiral water-cooled wall tube panel 2.

[0040] Furthermore, the fire-facing support is an open-loop mechanism 14, on which a second wedge-shaped groove connecting block and a tube screen support plate 15 are welded. The open-loop mechanism 14 is provided with bolt holes, which are used in conjunction with tightening bolts 5 to apply a vertically downward force to the supercritical spiral water-cooled wall tube screen 2. The tube screen support plate 15 can apply a vertically upward force to the supercritical spiral water-cooled wall tube screen 2. Through the cooperation of the bolt holes and tightening bolts 5 with the tube screen support plate 15, the supercritical spiral water-cooled wall tube screen 2 is subjected to balanced forces in the vertical direction, making it less prone to deformation during welding.

[0041] Furthermore, the wedge-shaped connection device includes a wedge-shaped sliding block 12 and a tightening bolt 5. The wedge-shaped sliding block 12 has a second oblong hole 13 in the middle. The tightening bolt 5 presses the outer side of the flange 1 through the second oblong hole 13. The wedge-shaped sliding block 12 slides into the first wedge-shaped groove connecting block and the second wedge-shaped groove connecting block from the side. The size of the wedge-shaped sliding block 12 can be changed according to the requirements of flanges 1 of different heights. The wedge-shaped sliding block 12 is mainly used for the connection and fixation of the back-fire flange fixing device and the fire-facing support, so that the cross section formed by the three is perpendicular to the flange direction.

[0042] Furthermore, the compacted steel profile includes angle steel 11 and channel steel 7. Angle steel 11 is positioned on the top surface of flange 1 and, in conjunction with the tightening bolts 5 in the back-facing flange fixing device, compresses the entire flange 1 surface. A locking slot for the hook 8 is provided at a corresponding position for the anti-displacement hook. Channel steel 7 is positioned on the back-facing tube panel and, in conjunction with the tightening bolts 5 in the fire-facing support, compresses the entire tube panel. A slot is provided at the position where the annular structure of the fire-facing support passes through. By installing the compacted steel profile, the force of the tightening bolts 5 is prevented from directly acting on flange 1 and the supercritical spiral water-cooled wall tube panel 2, increasing the stress-bearing area of ​​flange 1 and the supercritical spiral water-cooled wall tube panel 2, making flange 1 and the supercritical spiral water-cooled wall tube panel 2 less prone to deformation.

[0043] The operation steps of this invention are as follows:

[0044] Place the supercritical spiral water-cooled wall tube panel 2 on the assembly platform, and pave the bottom with a fixed support device. Place the flange 1 assembly to be welded on the tube panel as a whole and adjust its position. According to the specific length and width of the flange 1, set an appropriate installation pitch, and place the compacted steel on the upper part of the flange 1 and the upper part of the back-fired tube panel respectively.

[0045] Further: First, fit the fire-facing support into the tube screen. The tube screen support plate 15 in the fire-facing support is close to the fire-facing tube screen. The back-facing direction passes through the groove of the pre-placed channel steel 7 and is tightened with bolts 5. Then, install the wedge-shaped connection device and the back-facing flange fixing device in sequence to ensure that the cross-sectional area of ​​the three is perpendicular to the flange 1.

[0046] Further: After assembling the above components, install the tightening bolts 5 in the corresponding holes. The tightening bolts 5 will be tightened and adjusted later.

[0047] Further: One end of hook 8 in the anti-displacement hook hooks around the upper part of flange 1 and the angle steel 11 placed on the upper part from the inside of flange 1. After being tightened, it is fixed to the back-fired flange support member by means of pin 10.

[0048] Further: Install another set or more sets of devices according to the above steps, insert the connecting screw 3 and position it with nuts, use plumb line, level and other testing tools to check the installation of the device, and tighten all the screw nuts on the device after adjusting it into place.

[0049] Further steps: After the adjustment is completed, the welding work between flange 1 and the pipe panel can be carried out.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for flange welding of a supercritical spiral water-cooled wall tube panel, comprising a flange and a supercritical spiral water-cooled wall tube panel, characterized in that, The device for welding flanges of supercritical spiral water-cooled wall tubes also includes a back-fire flange fixing device, an anti-displacement hook, a wedge-shaped connection device, a fire-facing support, and tightening bolts. The back-fired flange fixing device is located on the outer side of the flange. The back-fired flange fixing device is provided with an unequal-length U-shaped mechanism, a first bolt hole, a first oblong hole, a connecting hole, and a pin hole. The first bolt hole, the first oblong hole, the connecting hole, and the pin hole are all located on the unequal-length U-shaped mechanism, and a first wedge-shaped groove connecting block is welded to the bottom of the unequal-length U-shaped mechanism. The back-fired flange fixing device is equipped with an angle steel, which is also provided with a clamping slot, and the clamping slot is connected to a hook. The anti-displacement hook includes a hook, a pin, a cotter pin, and a U-shaped block. The U-shaped block is connected to the unexposed flange fixing device, and both are provided with through pin holes. The hook is hinged to the cotter pin, the cotter pin is connected to the U-shaped block, and the pin is inserted into the pin hole of the U-shaped block and the unexposed flange fixing device. The wedge-shaped connection device is located below the back-fired flange fixing device; The fire-facing support is connected to a wedge-shaped connecting device. The fire-facing support includes an unclosed ring mechanism, a second wedge-shaped groove connecting block welded to the unclosed ring mechanism, and a tube screen support plate welded to the unclosed ring mechanism. The unclosed ring mechanism is provided with a plurality of second bolt holes. The fire-facing support is equipped with a channel steel with a slot, which is connected to the unclosed ring mechanism. These tightening bolts are used for multi-directional clamping and fixing of flanges and supercritical spiral water-cooled wall panels.

2. The apparatus for welding flanges of supercritical spiral water-cooled wall tubes according to claim 1, characterized in that, The wedge-shaped connecting device includes a wedge-shaped sliding block and a tightening bolt. The wedge-shaped sliding block has a second waist-shaped hole in the middle, and the tightening bolt is inserted into the waist-shaped hole. The tightening bolt can slide along the waist-shaped hole.

3. The apparatus for welding flanges of supercritical spiral water-cooled wall tubes according to claim 1, characterized in that, The fire-facing support and the unfacing flange fixing device are connected as a whole by a wedge-shaped connecting device.

4. The apparatus for welding flanges of supercritical spiral water-cooled wall tubes according to claim 3, characterized in that, The connecting hole is equipped with a connecting screw, which includes a screw and a nut.

5. A method for welding flanges of a supercritical spiral water-cooled wall panel, characterized in that, The method for welding flanges of supercritical spiral water-cooled wall tubes using the apparatus described in any one of claims 1-4 includes the following steps: S1: Set an appropriate installation pitch according to the actual length and width of the flange, and then place the angle steel and channel steel on the upper part of the flange and the upper part of the back-fired pipe panel respectively. S2: Insert the fire-facing support into the spiral tube screen and tighten the bolts in the corresponding holes; S3: Tighten the flange and compact the angle steel with anti-displacement hooks, and fix them with pins; S4: After adjusting the position of each component, tighten all the screw nuts on the above device.

6. The method for welding flanges of a supercritical spiral water-cooled wall panel according to claim 5, characterized in that, In step S2 above, the fire-facing support is first fitted into the tube screen, so that the tube screen support plate in the fire-facing support is close to the fire-facing tube screen, and the back-facing direction passes through the groove of the pre-placed compacted channel steel and the bolts are installed and tightened. Then, the wedge-shaped connection device and the back-facing flange fixing device are installed in sequence to ensure that the cross-sectional area of ​​the three is perpendicular to the flange.

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