Postweld heat treatment device for boiler water wall tube row

Abstract

The utility model discloses a postweld heat treatment device for a boiler water wall tube row, which belongs to the field of heat treatment equipment and comprises an upper clamping plate and a lower clamping plate, the upper clamping plate and the lower clamping plate are symmetrical in vertical structure, a plurality of T-shaped grooves in the front-back direction are respectively arranged on opposite surfaces of the upper clamping plate and the lower clamping plate, and a plurality of heaters with semicircular structures are arranged between the upper clamping plate and the lower clamping plate. The heaters at the upper position and the lower position form a complete circular ring to wrap the welding position of the water wall tube, T-shaped blocks are fixed outside the heaters, and the heaters are connected in a sliding mode along the interiors of the T-shaped grooves through the T-shaped blocks. The utility model solves the problems that the weld joints of the pipes are not on the same straight line and cannot be accurately positioned in the center of the heater.

Description

Technical Field

[0001] The utility model belongs to the field of heat treatment equipment, in particular to a post-welding heat treatment device for boiler water-cooled wall tubes. Background Art

[0002] The boiler water wall is the evaporation heating surface composed of tube rows in the furnace. The performance of its welded joints is crucial to the safe operation of the boiler. Post-weld heat treatment can change the metallographic structure of the welded joint, reduce the hardness, eliminate residual stress, and thus improve the performance of the welded joint.

[0003] The utility model patent with the publication number CN212833923U discloses a post-welding heat treatment device for water-cooled wall tubes of a boiler, including an insulation layer and a heater for providing heat to the heat treatment position of the water-cooled wall tube row. The insulation layer and the heater are both arc-shaped structures. The heater is arranged on the inner side of the insulation layer, and the heater matches the heat treatment position of the water-cooled wall tube row for easy fitting and installation. Fixing devices are provided at both ends of the insulation layer, and the fixing devices include fixing blocks arranged on the front and rear sides of the insulation layer, and bolts are installed on the fixing blocks. However, multiple arc-shaped heaters are integrated, and the actual water-cooled wall tubes are not necessarily in a straight line after welding. If the welds are staggered front and back, some welds cannot be accurately located at the center of the heater, resulting in uneven heat treatment at each weld. The uneven heating and cooling process of the welds will lead to the generation of welding residual stress, and may also cause defects such as cracks and deformation in the welds. Utility Model Content

[0004] The utility model aims to provide a post-welding heat treatment device for boiler water-cooled wall tubes, which solves the problems that the welds of various tubes are not in a straight line and the welds cannot be accurately located at the center of the heater.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A post-welding heat treatment device for water-cooled wall tubes of a boiler comprises an upper clamping plate and a lower clamping plate, wherein the upper and lower structures of the upper and lower clamping plates are symmetrical, and a plurality of T-shaped slots in the front-rear direction are respectively opened on the opposite surfaces, and a plurality of heaters with semicircular ring structures are arranged between the upper and lower clamping plates, and the heaters at the upper and lower positions form a complete ring wrapped around the welding position of the water-cooled wall tubes, and a T-shaped block is fixed outside the heater, and the heater is connected by sliding along the T-shaped slot through the T-shaped block.

[0007] Preferably, the heater is provided with a shell, an insulating layer and a heating element from the outside to the inside, and terminals are fixed at both ends of the heating element, and the terminals are externally connected to cables, and the cables are located in the cable channel and pass through the cable channel.

[0008] Preferably, the insulating layer is made of ceramic material.

[0009] Preferably, a cable channel is formed in the upper clamping plate and the lower clamping plate, and a cable movable groove is formed on the upper clamping plate and the lower clamping plate corresponding to the cable, and the cable movable groove is communicated with the cable channel.

[0010] Preferably, connecting blocks are fixed to the right sides of the upper clamping plate and the lower clamping plate respectively, and the upper clamping plate and the lower clamping plate are hinged through the connecting blocks.

[0011] Preferably, a baffle is fixed to the left end of the upper clamping plate, and magnetic blocks are respectively arranged between the baffle and the lower clamping plate, and the baffle is magnetically connected to the left end of the lower clamping plate through the magnetic blocks.

[0012] Preferably, a handle is fixed on the top of the upper clamping plate.

[0013] Preferably, a plurality of rollers are provided at the bottom of the lower clamping plate.

[0014] The utility model has the following beneficial effects:

[0015] 1. Each heater is independent and can slide back and forth. For uneven welds, each weld can be located in the center of the heater, so that the surrounding area of ​​the weld is heated evenly;

[0016] 2. Each heater is independent, and the heating elements are connected in parallel through cables, which means that the heating efficiency of the heating elements is fast, and the temperature can be quickly raised to the specified temperature, which speeds up the heat treatment of the water-cooled wall tubes after welding, and also avoids the situation where all heaters cannot heat due to damage to one heating element;

[0017] 3. The lower clamping plate can be quickly moved to the bottom of the water-cooled wall tube by rollers, and the upper clamping plate and the lower clamping plate can be hinged by connecting blocks, which is convenient for clamping the water-cooled wall tube after welding, and the magnetic suction block is used to speed up the heat treatment preparation work of the water-cooled wall tube after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the front view of the utility model;

[0019] Figure 2 It is a cross-sectional view of the upper splint and the lower splint of the utility model;

[0020] Figure 3 It is a cross-sectional view of the heater of the utility model;

[0021] Figure 4 This is a schematic diagram of the position of the cable movable groove of the utility model;

[0022] Figure 5 It is a schematic diagram of the hinge connection between the upper splint and the lower splint of the utility model;

[0023] Icons: 1. Upper clamping plate; 2. Lower clamping plate; 3. T-slot; 4. Heater; 41. Shell; 42. Insulation layer; 43. Heating element; 44. Terminal; 45. Cable; 5. T-block; 6. Cable channel; 7. Cable movable groove; 8. Connecting block; 9. Baffle; 10. Magnetic block; 11. Handle; 12. Roller. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1-5 As shown, in this embodiment, a post-welding heat treatment device for a boiler water-cooled wall tube comprises an upper clamping plate 1 and a lower clamping plate 2, wherein the upper and lower structures of the upper and lower clamping plates 1 and 2 are symmetrical, and a plurality of T-slots 3 in the front-rear direction are respectively opened on the opposite surfaces, and a plurality of heaters 4 with semicircular ring structures are arranged between the upper and lower clamping plates 1 and 2, and the heaters 4 at the upper and lower positions form a complete ring wrapped around the water-cooled wall tube welding part, and a T-block 5 is fixed outside the heater 4, and the heater 4 is connected by sliding along the T-slot 3 through the T-block 5, so that the heater 4 can be moved individually according to the weld position, so that the heater 4 is located just outside the weld, and the weld is heated evenly around to eliminate residual stress, thereby improving the performance of the weld.

[0027] Furthermore, the heater 4 is provided with a shell 41, an insulating layer 42 and a heating element 43 from the outside to the inside, respectively. The insulating layer 42 is made of ceramic material and plays the role of insulation and heat insulation. The two ends of the heating element 43 are respectively fixed with terminal posts 44, and the terminal posts 44 are externally connected with cables 45. Each of the heating elements 43 is connected in parallel through the cable 45 line, and the outer end of the cable 45 is connected to the electric heater. The heating elements 43 are connected in parallel through the cable 45 line. Since each heating element 43 is small in size, the heating element 43 can be quickly heated up to quickly heat the water-cooled wall tube, and even if a single heating element 43 is damaged, it will not affect the normal heating use of other heating elements 43, and the replacement cost of the heating element 43 is also reduced.

[0028] Furthermore, a cable channel 6 is opened in the upper clamp plate 1 and the lower clamp plate 2 so that all cables 45 can be unblocked, and a cable movable groove 7 is opened on the upper clamp plate 1 and the lower clamp plate 2 corresponding to the cables 45. The cable movable groove 7 is communicated with the cable channel 6. The cables 45 pass through the cable channel 6, which facilitates the cables 45 to move back and forth following the connected heater 4.

[0029] Furthermore, connecting blocks 8 are fixed to the right sides of the upper clamping plate 1 and the lower clamping plate 2, respectively, and the upper clamping plate 1 and the lower clamping plate 2 are hinged through the connecting block 8 and connected by rotation, so as to facilitate clamping of the water-cooled wall tubes after row welding.

[0030] Furthermore, a baffle plate 9 is fixed to the left end of the upper clamp plate 1, and a magnetic block 10 is respectively provided between the baffle plate 9 and the lower clamp plate 2. Compared with the bolt connection method, the magnetic connection between the baffle plate 9 and the left end of the lower clamp plate 2 through the magnetic block 10 is faster and convenient for disassembly and assembly.

[0031] Furthermore, a handle 11 is fixed on the top of the upper clamping plate 1, which is convenient for the upper clamping plate 1 to rotate and open the upper and lower docked heaters 4 through the connecting block. A plurality of rollers 12 are arranged at the bottom of the lower clamping plate 2, which is convenient for the lower clamping plate 2 to move quickly to the bottom of the water-cooled wall tube, so that the positions of the heater 4 and the water-cooled wall tube correspond one to one, and also avoid friction between the lower clamping plate 2 and the ground when moving.

[0032] The working principle of the utility model is as follows: the upper clamping plate 1 and the lower clamping plate 2 are opened to separate the upper and lower heaters 4, the lower clamping plate 2 is moved to the bottom of the water-cooled wall tube by rollers, the T-block 5 is slid along the T-slot, the position of the heater 4 is adjusted forward and backward, so that the corresponding water-cooled wall tube weld is located in the middle of the upper and lower heaters 4, the upper clamping plate 1 is dropped, the magnetic block 10 is magnetically connected, the upper and lower corresponding heaters 4 are clamped at the water-cooled wall tube weld, the electric heater is started, the heating element 43 is heated to a specified temperature, and the weld of the water-cooled wall tube is heat-treated after welding.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A post-welding heat treatment device for boiler water-cooled wall tubes, characterized in that: The invention comprises an upper clamping plate (1) and a lower clamping plate (2), wherein the upper and lower structures of the upper and lower clamping plates (1) and the lower clamping plates (2) are symmetrical, and a plurality of T-shaped grooves (3) in the front and rear directions are respectively opened on the opposite surfaces, and a plurality of heaters (4) with semicircular ring structures are arranged between the upper and lower clamping plates (1) and the heaters (4) at the upper and lower positions form a complete ring wrapped around the welding position of the water-cooled wall tubes, and a T-shaped block (5) is fixed outside the heater (4), and the heater (4) is connected by sliding along the T-shaped groove (3) through the T-shaped block (5).

2. A post-welding heat treatment device for boiler water-cooled wall tubes according to claim 1, characterized in that: The heater (4) is provided with a shell (41), an insulating layer (42) and a heating element (43) from the outside to the inside, and terminals (44) are fixed at both ends of the heating element (43), and the terminals (44) are externally connected to cables (45).

3. A post-welding heat treatment device for boiler water-cooled wall tubes according to claim 2, characterized in that: Each of the heating elements (43) is connected in parallel via a cable (45).

4. A post-welding heat treatment device for boiler water wall tubes according to claim 2, characterized in that: The insulating layer (42) is made of ceramic material.

5. A post-welding heat treatment device for boiler water-cooled wall tubes according to claim 1 or 2, characterized in that: The upper clamping plate (1) and the lower clamping plate (2) are provided with a cable channel (6); the upper clamping plate (1) and the lower clamping plate (2) corresponding to the cable (45) are provided with a cable movable groove (7); the cable movable groove (7) is communicated with the cable channel (6); the cable (45) is located in the cable channel (6) and passes through the cable channel (6).

6. A post-welding heat treatment device for boiler water-cooled wall tubes according to claim 1, characterized in that: A connecting block (8) is fixed to the right side of the upper clamping plate (1) and the lower clamping plate (2), respectively, and the upper clamping plate (1) and the lower clamping plate (2) are hingedly connected via the connecting block (8).

7. A post-welding heat treatment device for boiler water-cooled wall tubes according to claim 1, characterized in that: A baffle (9) is fixed to the left end of the upper clamping plate (1), and a magnetic block (10) is provided between the baffle (9) and the lower clamping plate (2), respectively. The baffle (9) and the left end of the lower clamping plate (2) are magnetically connected via the magnetic block (10).

8. The post-welding heat treatment device for boiler water-cooled wall tubes according to claim 1 is characterized in that: A handle (11) is fixed on the top of the upper clamping plate (1).

9. The post-welding heat treatment device for boiler water-cooled wall tubes according to claim 1, characterized in that: A plurality of rollers (12) are arranged at the bottom of the lower clamping plate (2).

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