Steam turbine rotor repairing device

Abstract

The utility model discloses a steam turbine rotor repairing device which comprises a supporting seat used for supporting a rotor and a repairing support, one end of the rotor is connected with a rotary driving mechanism, a machining device, a surfacing device and a laser cladding device are arranged on the repairing support, the machining device is located below the rotor, and the surfacing device is located below the rotor. The surfacing device and the laser cladding device are located above the rotor, the machining device, the surfacing device and the laser cladding device are all slidably connected with the repairing support, waste of shaft materials can be reduced, and meanwhile the cladding cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbine rotor repair, and more specifically relates to a device for repairing a steam turbine rotor through surfacing, finishing and laser cladding. Background Art

[0002] The turbine rotor is supported by bearings in the cylinder body, especially at the gas seal journal between the inside and outside of the cylinder body, which is susceptible to erosion by high-temperature and high-pressure steam, causing the shaft surface to wear faster and even cracks to appear, thus affecting the vibration of the rotor during rotation and the power conversion.

[0003] Currently, a common rotor repair method is to remove the rotor and blades from the cylinder body, place them on a repair machine, remove the wear-resistant layer (wear layer or fatigue layer) on the surface of the rotating shaft through machining such as turning, and then use laser cladding to clad the cladding material on the original wear-resistant layer. The cladding material has the same or better performance than the rotor material, such as the turbine rotor seal tooth repair system and method disclosed in publication number CN108202202B.

[0004] In the above-mentioned prior art and disclosed patents, in order to remove the worn or cracked parts, it is necessary to turn away the surrounding good parts to leave a cladding groove wider than the worn or cracked parts, and then fill the cladding material into the groove for cladding. When the cracked parts after wear are scattered on the shaft surface in block-like areas, more good shaft surface parts are turned away, resulting in a waste of shaft material and increasing the cladding cost. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a device for repairing a steam turbine rotor through surfacing, trimming and laser cladding, which reduces the waste of shaft materials during repair and also reduces the cladding cost.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a steam turbine rotor repair device, comprising a support seat and a repair bracket for supporting the rotor, one end of the rotor is connected to a rotation drive mechanism, and a processing device, a surfacing device and a laser cladding device are arranged on the repair bracket, the processing device is located below the rotor, the surfacing device and the laser cladding device are located above the rotor, and the processing device, the surfacing device and the laser cladding device are all slidably connected to the repair bracket.

[0007] Furthermore, the processing device includes a turning seat and a milling seat, a detachable turning tool is fixed on the turning seat, a high-speed rotatable milling head is arranged on the milling seat, and a detachable milling cutter is arranged on the milling head.

[0008] Furthermore, the surfacing device adopts resistance thermal energy micro-arc surfacing technology to weld and repair rotor damage defects.

[0009] Furthermore, the cladding device is provided with a cladding head which can be telescopically moved up and down, and the laser cladding device is provided with a laser cladding head which can be telescopically moved up and down.

[0010] Furthermore, the repair bracket is provided with a moving driving mechanism for driving the processing device, the surfacing device and the laser cladding device respectively.

[0011] Furthermore, a roller is provided at the bottom of the support seat, and a driving motor is connected to the roller.

[0012] Compared with the prior art, the beneficial effect of the utility model is that after the rotor is supported by the support seat, the defective parts on the rotor are first welded by a cladding device, and then the welded parts are trimmed by turning or milling, and the cladding groove is trimmed, and then the repair material is clad in the cladding groove by a laser cladding device, and finally the repair is completed, which reduces the turning of the good shaft surface parts around the defective parts by the original direct turning process, reduces the waste of shaft materials, and also reduces the cladding cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a front structural schematic diagram of the steam turbine rotor repair device of the utility model;

[0014] Figure 2 It is a side structural schematic diagram of the steam turbine rotor repairing device of the utility model.

[0015] Reference numerals: repair bracket 1; processing device 2; surfacing device 3; laser cladding device 4; rotor 5; support seat 6. DETAILED DESCRIPTION

[0016] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the present invention.

[0017] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" and "a number" is two or more, unless otherwise clearly and specifically defined.

[0018] Reference Figure 1 and Figure 2 The utility model is further described.

[0019] A steam turbine rotor repair device comprises a support seat 6 for supporting a rotor 5 and a repair bracket 1, one end of the rotor 5 is connected to a rotation drive mechanism, and the repair bracket 1 is provided with a processing device 2, a surfacing device 3 and a laser cladding device 4, the processing device 2 is located below the rotor 5, the surfacing device 3 and the laser cladding device 4 are located above the rotor 5, and the processing device 2, the surfacing device 3 and the laser cladding device 4 are all slidably connected to the repair bracket 1.

[0020] Preferably in this embodiment, the processing device 2 includes a turning seat and a milling seat, a detachable turning tool is fixed on the turning seat, a high-speed rotating milling head is provided on the milling seat, and a detachable milling cutter is provided on the milling head.

[0021] Preferably, in this embodiment, the surfacing device 3 uses resistance thermal energy micro-arc surfacing technology to weld and repair the damage defects of the rotor 5.

[0022] like Figure 2 As shown, in this embodiment, preferably, the cladding device 3 is provided with a cladding head which can be telescopically extended upward and downward, and the laser cladding device 4 is provided with a laser cladding head which can be telescopically extended upward and downward.

[0023] Preferably, in this embodiment, the repair bracket 1 is provided with a moving driving mechanism for driving the processing device 2, the surfacing device 3 and the laser cladding device 4 respectively.

[0024] Preferably in this embodiment, a roller is provided at the bottom of the support seat 6, and a driving motor is connected to the roller.

[0025] like Figure 1 and Figure 2As shown, after the rotor 5 is supported by the support seat 6, the support seat 6 is moved to make one end of the rotor 5 pass through the repair bracket 1 so that the shaft section to be repaired is located above the processing device 2, and then the repair part is adjusted so that the repair part is located at the top of the rotor 5, and then the cladding device 3 is moved to the top of the rotor 5, and the cladding head is extended to start welding the repair part. During the welding process, the rotor 5 can rotate, and the support seat 6 and the cladding device 3 can move, so that welding can be performed in all directions; when all the repair parts are welded, the welding position is trimmed by the processing device 2 under the rotor 5, and turning or milling can be selected. At the same time, the oxide layer on the surface of the welding part is processed away during the trimming to form a cladding groove; the cladding device 3 is reset, and the laser cladding device 4 is moved to the top of the rotor 5, and the laser cladding head is extended to start laser cladding in the cladding groove. A protective layer is formed on the surface of the repair part by laser cladding. The protective ability of the protective layer is equal to or better than other parts of the rotor 5, and finally the rotor 5 is repaired.

[0026] By adding a surfacing device 3 to first weld the defective parts on the rotor 5, then process and trim them, and finally perform laser cladding, the original direct turning process can reduce the turning of the good shaft surface parts around the defective parts, reduce the waste of shaft materials, and also reduce the cladding cost.

[0027] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A steam turbine rotor repair device, characterized in that: It includes a support seat and a repair bracket for supporting the rotor. One end of the rotor is connected to a rotation drive mechanism. The repair bracket is provided with a processing device, a surfacing device and a laser cladding device. The processing device is located below the rotor. The surfacing device and the laser cladding device are located above the rotor. The processing device, the surfacing device and the laser cladding device are all slidably connected to the repair bracket.

2. The steam turbine rotor repair device according to claim 1, characterized in that: The processing device comprises a turning seat and a milling seat, a detachable turning tool is fixed on the turning seat, a milling head which can rotate at high speed is arranged on the milling seat, and a detachable milling cutter is arranged on the milling head.

3. The steam turbine rotor repairing device according to claim 1, characterized in that: The surfacing device adopts the resistance thermal energy micro-arc surfacing technology to weld and repair the rotor damage defects.

4. The steam turbine rotor repairing device according to claim 1, characterized in that: The cladding device is provided with a cladding head which can be extended up and down, and the laser cladding device is provided with a laser cladding head which can be extended up and down.

5. The steam turbine rotor repairing device according to claim 1, characterized in that: The repair bracket is provided with a moving driving mechanism which drives the processing device, the surfacing device and the laser cladding device respectively.

6. The steam turbine rotor repairing device according to claim 1, characterized in that: A roller is arranged at the bottom of the support seat, and a driving motor is connected to the roller.

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