Membrane water wall tube panel structure and welding tool

Abstract

The invention discloses a membrane type water cooling wall structure which comprises pipes and flat steel, the flat steel is welded between two pipes which are arranged side by side and adjacent to each other, and vertical fins are further arranged on the pipes, so that the heating area of the pipes can be increased, and the heat exchange efficiency of a water cooling wall is further improved. The welding tool comprises at least three pairs of upper roll shafts and lower roll shafts which are arranged on a membrane wall welding machine in the advancing direction of a workpiece, each pair of upper roll shafts and lower roll shafts is correspondingly provided with a grooved wheel, the outer cylindrical surface of each grooved wheel is provided with an annular groove, and the annular grooves are matched with the upper roll shafts and the lower roll shafts. Annular grooves are formed in the bottoms of the grooves, the depth of the grooves is larger than the width of the vertical fins, and the width of the grooves is larger than the thickness of the vertical fins. The widths of the grooves in the grooved wheel are different, and the grooves are sequentially reduced in the advancing direction of a workpiece, so that the feeding and positioning requirements can be fully met, meanwhile, a product can be better positioned in the welding machining process, and the machining precision is improved.

Description

Technical Field

[0001] The present invention relates to the field of manufacturing boiler membrane water walls, and particularly to a tube panel structure and a welding tooling for a membrane water wall. Background Art

[0002] A boiler membrane water wall refers to an airtight tube panel formed by welding flat steel and tubes side by side. The membrane water wall can ensure good tightness of the furnace. For a negative pressure boiler, it can significantly reduce the air leakage coefficient of the furnace and improve the combustion condition in the furnace. It can increase the effective radiation heating area, thereby saving energy consumption and improving the thermal efficiency of the boiler.

[0003] The structure of a boiler membrane water wall is formed by alternately welding tubes and flat steel, usually in a planar or annular shape. The quality of the manufacture of the membrane water wall is related to the safe operation of the boiler and the level of energy conversion rate, and it has an important impact on safety, energy conservation, and environmental protection. Therefore, high-quality and high-efficiency manufacture of the membrane water wall occupies an important position in the boiler manufacturing process. In the prior art, in order to improve production efficiency, when processing the membrane water wall, generally a welding production line equipment is used to weld multiple tubes and flat steel. The membrane wall welding production line usually consists of a membrane wall mixed gas shielded welder and corresponding welding roller beds, which is the main equipment for membrane wall production and has the advantages of small welding deformation, relatively small amount of straightening work, and the form of workpiece passing through in the welder structure, and the length of the workpiece is not limited by the welder. However, the pitch of the workpiece tubes is controlled by the distance between the grooved pulleys on the welder. An annular groove is provided on the outer cylindrical surface of the grooved pulley, and the cross-section of the groove is semi-circular and corresponds to the outer diameter of the tube; the up and down positions of the flat steel are ensured by the up and down positions of the flat steel supporting pulley and the pressing pulley. The diameter of the tube that can be welded and processed is Ф38-Ф76mm, the maximum width of the membrane wall tube panel can reach 3200mm, the walking speed of the tube panel is 400-1200mm / min, and the welding speed is ≥650mm / min. This kind of welding production line has been used in our company and units such as Wuxi Boiler Factory, Tianshan Boiler Factory, Shijiazhuang Boiler Factory, and Sichuan Boiler Factory. However, this production line can only process the membrane wall of smooth tubes plus flat steel, and cannot process the membrane wall of tubes with vertical fins plus flat steel. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a tube panel structure and a welding tooling for a membrane water wall to solve the related problems raised in the above background art.

[0005] The technical solution adopted by the present invention to achieve the above purpose is as follows: A membrane water wall structure includes tubes and flat steel, and the flat steel is welded between two adjacent tubes arranged side by side. The feature is that: vertical fins are further provided on the tubes.

[0006] In the above-described membrane water wall structure, vertical fins are provided on both sides of the membrane water wall on the tube. The length direction of the vertical fins is parallel to the axis of the tube, and the width direction of the vertical fins is perpendicular to the wall surface of the membrane water wall.

[0007] By adopting the above technical solution, vertical fins are provided on the tube, which can increase the heat absorption area of the tube and further improve the heat transfer efficiency of the water wall.

[0008] A welding tooling for processing the above-described membrane water wall tube panel includes at least three pairs of upper roller shafts and lower roller shafts provided on a membrane wall welding machine. Corresponding grooved pulleys are respectively provided on each pair of upper roller shafts and lower roller shafts. An annular groove is provided on the outer cylindrical surface of the grooved pulley. It is characterized in that: an annular groove is provided at the bottom of the groove, the depth of the groove is greater than the width of the vertical fin, and the width of the groove is greater than the thickness of the vertical fin.

[0009] By providing grooved pulleys on the upper roller shaft and the lower roller shaft, the membrane water wall tube panel to be welded can be moved under the drive of the upper and lower grooved pulleys, and it helps to improve the smoothness of the tube movement. And vertical fins are provided on the tube, and an annular groove is provided at the bottom of the groove, which can not only increase the heat absorption area of the tube and further improve the heat transfer efficiency of the water wall, but also better position the product during the welding process and improve the processing accuracy.

[0010] Further, three pairs of upper roller shafts and lower roller shafts are provided on the membrane wall welding machine, which are the first pair of upper roller shaft and lower roller shaft, the second pair of upper roller shaft and lower roller shaft, and the third pair of upper roller shaft and lower roller shaft in sequence according to the traveling direction of the workpiece; a first grooved pulley is provided on the first pair of upper roller shaft and lower roller shaft, a second grooved pulley is provided on the second pair of upper roller shaft and lower roller shaft, and a third grooved pulley is provided on the third pair of upper roller shaft and lower roller shaft; the thickness of the vertical fin is t, the groove width W on the first grooved pulley = (t + 2) mm, the groove width W on the second grooved pulley = (t + 1) mm, and the groove width W on the third grooved pulley = (t + 0.3) mm.

[0011] By adopting the above technical solution, multiple pairs of grooved pulleys are provided along the traveling direction of the workpiece, and the groove widths on the grooved pulleys are different and gradually decrease along the traveling direction of the workpiece, which can fully meet the feeding and positioning requirements. Beneficial effects

[0012] The technical solution of the present invention is provided with vertical fins on the pipe, which can increase the heat absorption area of the pipe and further improve the heat exchange efficiency of the water wall. Through the grooved pulleys arranged on the upper roller shaft and the lower roller shaft, the membrane water wall tube screen to be welded can be moved under the drive of the upper and lower grooved pulleys, and it helps to improve the smoothness of the pipe movement. And a plurality of pairs of grooved pulleys are arranged along the traveling direction of the workpiece. An annular groove is provided on the outer cylindrical surface of the grooved pulley, and an annular groove is provided at the bottom of the groove. The groove widths of each pair of grooved pulleys are different, and they gradually decrease along the traveling direction of the workpiece, which can fully meet the feeding and positioning requirements. At the same time, during the welding process, the product can be better positioned, improving the processing accuracy. Brief Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of a prior art membrane water wall.

[0014] Figure 2 is a schematic structural diagram of the membrane water wall structure of the present invention.

[0015] Figure 3 is a schematic structural diagram of a welding tooling for a membrane water wall in the prior art.

[0016] Figure 4 is a schematic structural diagram of a welding tooling for a membrane water wall of the present invention.

[0017] In the figure: 1 pipe, 2 flat steel, 3 vertical fin, 4 upper grooved pulley, 5 lower grooved pulley, 6 gasket, 7 upper roller shaft, 8 lower roller shaft, groove 9, groove 10. Detailed Embodiment

[0018] To clearly illustrate the technical features of the present solution, the present invention will be further described below through non-limiting embodiments in combination with the drawings.

[0019] The up and down directions described in the present invention are based on the up and down directions shown in the drawings. For the convenience of description, only the parts related to the embodiments of the present invention are shown.

[0020] Please refer to Figure 2 , a membrane water wall structure, including a plurality of pipes 1 and flat steels 2. The flat steels 2 are welded between two adjacent pipes 1 arranged side by side, and vertical fins 3 are also provided on the pipes 1.

[0021] Specifically, vertical fins 3 are provided on both sides of the membrane water wall on the above-mentioned pipes 1. The length direction of the vertical fins 3 is parallel to the axis of the pipes 1, and the width direction of the vertical fins 3 is perpendicular to the wall surface of the membrane water wall.

[0022] Please refer to Figure 4, A welding tool for processing the above-mentioned membrane water wall tube panel, including a membrane wall welding machine with a welding torch. There are three pairs of upper and lower roller shafts arranged on the membrane wall welding machine, which are the first pair of upper and lower roller shafts, the second pair of upper and lower roller shafts, and the third pair of upper and lower roller shafts in sequence according to the advancing direction of the workpiece. A number of first upper grooved pulleys are arranged on the upper roller shaft of the first pair of upper and lower roller shafts, and a number of corresponding first lower grooved pulleys are arranged on the lower roller shaft. A number of second upper grooved pulleys are arranged on the upper roller shaft of the second pair of upper and lower roller shafts, and a number of corresponding second lower grooved pulleys are also arranged on the lower roller shaft. A number of third upper grooved pulleys are arranged on the upper roller shaft of the third pair of upper and lower roller shafts, and a number of corresponding third lower grooved pulleys are arranged on the lower roller shaft. Annular grooves are provided on the outer cylindrical surfaces of the first upper grooved pulley, the first lower grooved pulley, the second upper grooved pulley, the second lower grooved pulley, the third upper grooved pulley, and the third lower grooved pulley. The cross-section of the groove is semi-circular and is adapted to the outer diameter of the membrane wall tube. An annular groove is provided at the bottom of the groove, and the depth of the groove is greater than the width of the vertical fin, and the width of the groove is greater than the thickness of the vertical fin.

[0023] In this embodiment, the thickness t of the vertical fin is 6 mm. The groove width W on the first upper grooved pulley and the first lower grooved pulley is (t + 2) = 8 mm. The groove width W on the second upper grooved pulley and the second lower grooved pulley is (t + 1) = 7 mm. The groove width W on the third upper grooved pulley and the third lower grooved pulley is (t + 0.3) = 6.3 mm.

[0024] The working process of this embodiment is as follows: (1) Fix the tool on the welding machine of the production line; (2) Adjust appropriate parameters such as the feeding speed; (3) Fix the tube and the flat steel at the positioning positions; (4) Turn on the feeding conveyor device, adjust the position of the welding torch. After the feeding is completed, the membrane wall welding of the same plane is completed; (5) Place the upper vertical fin in the groove at the bottom of the annular groove along the feeding direction (the feeding direction is the same as the axial direction of the tube). Adjust the positions of the upper and lower grooved pulleys. After positioning the upper vertical fin, start welding; (6) After the welding of the upper vertical fin is completed, turn the product 180 degrees, and repeat step (5) to weld the lower vertical fin; (7) After the feeding is ended, the welding of the product is completed. (8) Inspect.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "left", "right", "front", "rear", "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. The above terms are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0026] Unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Except for the technical features described in the specification, the rest are known technologies to those of ordinary skill in the art.

[0028] The above-listed embodiments are only for understanding the present invention and are not a limitation on the technical solutions described in the present invention. Those of ordinary skill in the relevant art can make various changes or deformations on the basis of the technical solutions described in the claims, and all equivalent changes or deformations should be covered by the protection scope of the claims of the present invention.

Claims

1. A membrane water-cooled wall structure, comprising a tube and a flat steel, wherein the flat steel is welded between two tubes arranged side by side and adjacent to each other, characterized in that: The tube is also provided with vertical fins.

2. The membrane water-cooled wall structure according to claim 1, characterized in that: Vertical fins are arranged on the tubes and on both sides of the membrane water-cooled wall. The length direction of the vertical fins is parallel to the axis of the tubes, and the width direction of the vertical fins is perpendicular to the wall surface of the membrane water-cooled wall.

3. A welding tool for processing the membrane water-cooled wall tube panel according to claim 1 or 2, comprising at least three pairs of upper rollers and lower rollers arranged on a membrane wall welding machine, each pair of upper rollers and lower rollers are respectively provided with groove wheels, and an annular groove is provided on the outer cylindrical surface of the groove wheel, characterized in that: An annular groove is provided at the bottom of the groove, the depth of the groove is greater than the width of the vertical fin, and the width of the groove is greater than the thickness of the vertical fin.

4. The welding tool for membrane water-cooled wall tube panel according to claim 3 is characterized in that: The membrane wall welding machine is provided with three pairs of upper rollers and lower rollers, which are the first pair of upper rollers and lower rollers, the second pair of upper rollers and lower rollers, and the third pair of upper rollers and lower rollers in the moving direction of the workpiece; the first pair of upper rollers and lower rollers are provided with a first groove wheel, the second pair of upper rollers and lower rollers are provided with a second groove wheel, and the third pair of upper rollers and lower rollers are provided with a third groove wheel; the thickness of the vertical fin is t, the groove width on the first groove wheel is W=(t+2)mm, the groove width on the second groove wheel is W=(t+1)mm, and the groove width on the third groove wheel is W=(t+0.3)mm.

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