Assembling and welding auxiliary device for hood fixing plate

Abstract

The utility model discloses an assembling and welding auxiliary device for a hood fixing plate, which comprises a disc base, a core rod, a supporting and positioning pipe, an assembling pressure pipe and a fastening nut, the core rod and the disc base are coaxial and are fixedly connected, the upper end part of the core rod is provided with external threads and is in threaded connection with the fastening nut, the supporting and positioning pipe and the assembling pressure pipe are respectively sleeved outside the core rod, and the supporting and positioning pipe and the assembling pressure pipe are fixedly connected with the disc base. The assembling pressing pipe is pressed on the upper portion of the supporting and positioning pipe, and a plurality of spot welding holes are evenly distributed in the lower end of the assembling pressing pipe in the circumferential direction. The device is simple and reasonable in structure, can be used as an assembling and welding auxiliary tool of the hood fixing plate, and can tightly press the fixing plate when the fixing plate is assembled and subjected to spot welding, so that the thermal deformation of the fixing plate is small, and the manufacturing precision requirement of the fixing plate is met.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler manufacturing auxiliary devices, in particular to an auxiliary device for welding a hood fixing plate. Background Art

[0002] The hood is a critical component of a circulating fluidized bed boiler. Most current hoods utilize a bell-shaped design, consisting primarily of a hood head, air duct, and a mounting plate, with the mounting plate typically mounted on top of the air duct. The clearance between the hood head and mounting plate is crucial and is typically maintained between 0.5mm and 1.0mm. Excessive clearance can cause the hood head to vibrate excessively, accelerating wear and causing it to loosen or even fall off. Excessively small clearance, or even a negative deviation, can hinder airflow from the hood, leading to blockage at the hood outlet and insufficient cooling of the hood head. This can lead to overheating and carbonization of the hood, resulting in a decrease in hardness. Consequently, an inappropriate clearance can significantly reduce the lifespan of the hood.

[0003] Existing hood fixing plates utilize nuts with corresponding external threads on the air duct. Adjusting the threads effectively controls the gap between the fixing plate and the hood head. However, most hood fixing plates are welded to the air duct. In this case, the assembly tolerance of the fixing plate on the duct is actually the gap between the hood head and the fixing plate. During manufacturing, the fixing plate is first spot-welded to the air duct and then welded around the duct to secure it. This results in significant thermal deformation during welding. In practice, the flatness deviation of the fixing plate after spot welding alone is approximately 3mm, and this deviation increases further after welding, completely failing to meet the tolerance requirements of the design drawings. Data from sample manufacturing indicates that controlling flatness deviation during spot welding is extremely important. The smaller the flatness deviation of the fixing plate after spot welding, the smaller the flatness deviation after welding. Therefore, designing an auxiliary tooling for the assembly and welding of the hood fixing plate is crucial in the manufacturing process of this type of hood. Utility Model Content

[0004] In order to solve the above technical problems, the utility model designs a welding auxiliary device for a hood fixing plate.

[0005] The utility model adopts the following technical solutions:

[0006] A welding auxiliary device for a hood fixing plate includes a disc base, a core rod, a support and positioning tube, an assembly pressure tube and a fastening nut. The core rod is coaxial with the disc base and fixedly connected. The upper end of the core rod is provided with an external thread, which forms a threaded connection with the fastening nut. The support and positioning tube and the assembly pressure tube are respectively sleeved on the outside of the core rod and pressed against each other by the fastening nut. The assembly pressure tube is pressed against the upper part of the support and positioning tube, and a plurality of spot welding holes are evenly distributed circumferentially on the lower end of the assembly pressure tube.

[0007] Preferably, a circular ring plate is welded to the upper end of the assembly pressure tube.

[0008] Preferably, the core rod is welded to the center of the disc base.

[0009] Preferably, the fastening nut is a butterfly nut.

[0010] Preferably, four spot welding holes are evenly distributed circumferentially on the lower end of the assembly pressure tube.

[0011] The beneficial effects of the utility model are as follows: the utility model has a simple and reasonable structure, and the device serves as an auxiliary tool for welding the hood fixing plate, which can press the fixing plate during spot welding of the fixing plate, thereby reducing the thermal deformation of the fixing plate and meeting its manufacturing accuracy requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 This is a structural diagram of the hood fixing plate being welded to the air duct;

[0014] Figure 3 This is a usage state diagram of the utility model;

[0015] In the figure: 1. Disc base, 2. Core rod, 3. Support and positioning tube, 4. Assembly pressure tube, 5. Butterfly nut, 6. Air duct, 7. Fixing plate. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0017] Example: Figure 1 Figure 1 shows an auxiliary welding tool for a hood mounting plate. It includes a disc base 1, a core rod 2, a support and positioning tube 3, an assembly pressure tube 4, and a butterfly nut 5. The core rod 2 is coaxial with the disc base 1 and welded to it. The upper end of the core rod 2 has external threads that form a threaded connection with the butterfly nut 5. The lower end 4 of the assembly pressure tube has four holes evenly distributed around its circumference, and a circular plate is welded to the other end.

[0018] like Figure 2 As shown, an actual working object of a welding auxiliary tool for a hood fixing plate includes an air duct 6 and a fixing plate 7. The assembly size of the fixing plate 7 relative to the air duct 6 is based on the end face of the air duct.

[0019] like Figure 3The figure shows an actual application of a welding auxiliary tool for a hood fixing plate. The support and positioning tube 3 is inserted through the core rod 2 and placed on the disc base 1. The air duct 6 is inserted through the core rod 2, placed into the support and positioning tube 3, and placed on the disc base 1, with the end face of the fixing plate 7 facing downward. The fixing plate 7 is inserted through the core rod 2 and placed on the support and positioning tube 3. The assembly pressure tube 4 is inserted through the core rod 2 and pressed onto the fixing plate 7. The butterfly nut 5 is screwed into the threaded upper end of the core rod 2.

[0020] During actual operation, the butterfly nut 5 is tightened to assemble the pressure tube 4 through thread adjustment, so that the fixed plate 7 is pressed firmly up and down, which greatly reduces the thermal deformation of the fixed plate 7 during assembly spot welding. The fixed plate 7 is assembled and spot welded through the four holes of the pressure tube 4. In order to balance the thermal deformation of the fixed plate 7, the fixed plate 7 is assembled and spot welded at the first location, and then the second location is spot welded from the hole opposite the first spot welding hole. After the four spot weldings are completed, the gap between the fixed plate 7 and the supporting positioning tube 3 is checked with a detection tool. The gap is actually the assembly tolerance of the fixed plate and the air duct. The assembly tolerance of the hood tube 6 and the fixed plate 7 manufactured using this auxiliary tooling after spot welding can basically be controlled at about 0.5mm. The final tolerance of the hood tube 6 and the fixed plate 7 after circumferential welding does not exceed 1mm, which meets the manufacturing requirements of the design drawings.

[0021] The embodiment described above is only a preferred solution of the present invention and does not limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A welding auxiliary device for a hood fixing plate, characterized in that: It includes a disc base, a core rod, a supporting and positioning tube, an assembly pressure tube and a fastening nut. The core rod is coaxial with the disc base and fixedly connected. The upper end of the core rod is provided with an external thread, which forms a threaded connection with the fastening nut. The supporting and positioning tube and the assembly pressure tube are respectively sleeved on the outside of the core rod and pressed against each other by the fastening nut. The assembly pressure tube is pressed against the upper part of the supporting and positioning tube, and a plurality of spot welding holes are evenly distributed circumferentially on the lower end of the assembly pressure tube.

2. The auxiliary welding device for the hood fixing plate according to claim 1, characterized in that: A circular plate is welded on the upper end of the assembly pressure pipe.

3. The auxiliary welding device for the hood fixing plate according to claim 1, characterized in that: The core rod is welded to the center of the disc base.

4. The auxiliary welding device for the hood fixing plate according to claim 1, characterized in that: The fastening nut is a butterfly nut.

5. The auxiliary welding device for the hood fixing plate according to claim 1, characterized in that: The lower end of the assembly pressure tube is evenly distributed with four spot welding holes in the circumferential direction.

Images