A center tube for reducing welding roundness error by means of an integrally cast pattern

Abstract

The utility model discloses a center cylinder of reducing welding roundness error with the help of integrated casting pattern, including upper part cast cylinder and lower part welding cylinder body, upper part cast cylinder is integrated cast into shape, and lower part welding cylinder body is contrasted upper part cast cylinder by many pieces of fan -shaped bent plate, and is welded and is assembled to constitute, and upper part cast cylinder and lower part welding cylinder body are connected through welding, and upper part cast cylinder is hung through the support fixing device. The utility model discloses upper part cast cylinder adopts integrated casting into shape, makes roundness error less than or equal to 0.5%, eliminates the weak link of welding, reduces the risk of weld cracking, makes the stress of overall structure dispersion more uniform, and is not easy to deform. Lower part welding cylinder body is divided into many pieces of fan -shaped bent plate, and the on -the -spot reference upper part cast cylinder is welded as the pattern, and the roundness error brought by on -the -spot welding is reduced to the maximum extent. The circular ring steel plate of reinforcing ring beam is welded at the other end of lower part welding cylinder body, can reduce the welding roundness error of the other end, avoids partial stress concentration after installation.

Description

Technical Field

[0001] This utility model relates to the field of circulating fluidized bed boiler technology, and in particular to a center cylinder that reduces welding roundness error by means of an integral casting mold. Background Technology

[0002] Cyclone separators are key components of circulating fluidized bed boilers. Their function is to allow flue gas to enter the separator through inlets, where it rotates between the central cylinder and the separator, efficiently separating solid particles from the flue gas and returning them to the furnace to ensure combustion efficiency and environmentally friendly emissions. The central cylinder, as the core component of the cyclone separator, directly affects the separation efficiency and the overall operational reliability of the boiler due to its structural strength and stability.

[0003] Traditional separator center cylinders are often made of sheet-like or tile-shaped plates for easy transport and are assembled on-site by welding. Due to variations in on-site welding conditions and welder skill levels, the welded center cylinder has roundness errors. Due to welding deformation and cumulative assembly errors, the overall roundness error of traditional welded structures is typically ≥1.2%. Under the long-term scouring of high-temperature, high-velocity dust-laden flue gas, weak welded areas of the center cylinder are prone to cracking, generating localized thermal stress and thermal deformation. After one year of operation, the roundness error may increase to over 3%, leading to a decrease in separator efficiency and even affecting the safe operation of the boiler. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model designs a center cylinder that reduces welding roundness error by using an integral casting mold.

[0005] The present invention adopts the following technical solution: A center cylinder for reducing welding roundness error by means of integral casting template includes a center cylinder comprising an upper cast cylinder and a lower welded cylinder. The upper cast cylinder is integrally cast, and the lower welded cylinder is assembled by welding multiple fan-shaped curved plates to the upper cast cylinder. The upper cast cylinder and the lower welded cylinder are connected by welding, and the upper cast cylinder is suspended by a support and fixing device.

[0006] Preferably, the support and fixing device consists of several support plates and a support plate, which are evenly distributed along the circumference; the support plate is welded to the outer protective plate used for hanging support, the support plate supports the support plate, and the support plate is used to support and hang the upper cast cylinder.

[0007] Preferably, the pallet has a groove, and a hanging arm is provided on the outer side of the upper cast cylinder. The groove on the pallet supports and suspends the upper cast cylinder through the hanging arm.

[0008] Preferably, the groove has a gap corresponding to the mounting arm, allowing the central cylinder to expand freely.

[0009] Preferably, the lower welded cylinder is provided with reinforcing ring beams evenly distributed along the circumference on the lower outer side.

[0010] Preferably, the reinforcing ring beam is composed of a circular steel plate and reinforcing ribs, with the reinforcing ribs evenly distributed along the circumference.

[0011] The beneficial effects of this utility model are as follows: In this utility model, the upper cast cylinder adopts three-dimensional positioning and is integrally cast, ensuring a roundness error of ≤0.5%, eliminating weak points in welding, reducing the risk of weld cracking, and making the overall structure more uniformly distributed in stress, making it less prone to deformation. The lower welded cylinder is divided into multiple fan-shaped curved plates, which are used as a template for on-site welding, minimizing the roundness error caused by on-site welding. The circular steel plate of the reinforcing ring beam is welded to the other end of the lower welded cylinder, which can reduce the welding roundness error at the other end and avoid local stress concentration after installation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the lower welded cylinder of this utility model; In the diagram: 1. Upper cast cylinder, 2. Lower welded cylinder, 3. Reinforcing ring beam, 4. Support and fixing device, 5. Outer protective plate, 6. Support plate, 7. Support plate. Detailed Implementation

[0013] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings: Example: Figure 1 and Figure 2 As shown, a central cylinder for reducing welding roundness error using an integral casting template includes an upper cast cylinder 1, a lower welded cylinder 2, a reinforcing ring beam 3, and a support and fixing device 4. The upper cast cylinder 1 is integrally cast and suspended in a groove in the support plate of the support and fixing device 4; the groove has gaps to allow the central cylinder to expand freely. The lower welded cylinder 2 is composed of multiple fan-shaped curved plates, assembled on-site by welding according to the upper cast cylinder; the upper cast cylinder 1 and the lower welded cylinder 2 are connected by welding. The reinforcing ring beam 3 is composed of a circular steel plate and reinforcing ribs, with the reinforcing ribs evenly distributed along the circumference. The support and fixing device 4 consists of several support plates 6 and support plates 7, evenly distributed along the circumference; the support plates are welded to the outer protective plate 5 used for suspension support, supporting the support plates. The support plates have grooves for suspending the upper cast cylinder 1.

[0014] In this invention, the upper cast cylinder is three-dimensionally positioned and integrally cast, ensuring a roundness error of ≤0.5%. This eliminates weak points in the welding, reduces the risk of weld cracking, and makes the overall structure more evenly distributed in stress, making it less prone to deformation. The lower welded cylinder is composed of multiple fan-shaped curved plates, which are used as a template for on-site welding, minimizing roundness errors caused by on-site welding. The reinforcing ring beam is welded to the other end of the lower welded cylinder, reducing the roundness error at that end and preventing localized stress concentration after installation.

[0015] The above-described embodiments are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A center tube for reducing welding roundness error by means of an integral casting mold, comprising a center tube, characterized in that, The central cylinder comprises an upper cast cylinder and a lower welded cylinder. The upper cast cylinder is integrally cast, and the lower welded cylinder is constructed by welding multiple fan-shaped curved plates to the upper cast cylinder. The upper cast cylinder and the lower welded cylinder are connected by welding, and the upper cast cylinder is suspended by a support and fixing device.

2. A center cylinder for reducing welding roundness error by means of an integral casting mold according to claim 1, characterized in that, The support and fixing device consists of several support plates and a support plate, which are evenly distributed along the circumference. The support plates are welded to the outer protective plate used for hanging support. The support plates support the support plates, and the support plates are used to support the upper cast cylinder for hanging.

3. A center cylinder for reducing welding roundness error by means of an integral casting mold according to claim 2, characterized in that, The pallet has a groove, and a hanging arm is provided on the outside of the upper cast cylinder. The groove on the pallet supports and suspends the upper cast cylinder through the hanging arm.

4. A center cylinder for reducing welding roundness error by means of an integral casting mold according to claim 3, characterized in that, The groove provides a gap for the mounting arm.

5. A center cylinder for reducing welding roundness error by means of an integral casting mold according to claim 1, characterized in that, The lower welded cylinder is provided with reinforcing ring beams evenly distributed along the circumference on its lower outer side.

6. A center cylinder for reducing welding roundness error by means of an integral casting mold according to claim 5, characterized in that, The reinforcing ring beam is composed of a circular steel plate and reinforcing ribs, with the reinforcing ribs evenly distributed along the circumference.

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