Heating template forming and welding process applied to steam turbines

Abstract

The present invention discloses a heating template forming and processing welding process applied to steam turbines. Using materials such as stainless steel sheets as raw material sheets, raw material sheets of corresponding specifications are cut according to the structural curved surface shape of the steam turbine, and equidistant wiring is carried out based on the cross-sectional area of the raw material sheets. Compared with the conventional operation method, a welding tooling is used in the overall welding process. The welding tooling is mainly used to assist in fixing the electric wire heating element assembly. During the manual operation process, with manual operation as the main and the welding tooling as the auxiliary, the welding tooling is used in combination, and the wiring, wire fixing, and welding actions can be carried out synchronously on the electric wire heating element assembly. Through the auxiliary operation of the welding tooling, the local electric wire heating element assembly is fixed to maintain the spacing during the wiring action, and the wire fixing and welding actions are carried out synchronously. The overall operation process can simplify the steps of manually welding the electric wire heating element and ensure the heating effect of the subsequent heating template on the steam turbine.

Description

Technical Field

[0001] The present invention relates to the technical field of welding processes, and specifically relates to a heating template forming and processing welding process applied to steam turbines. Background Art

[0002] After a steam turbine is normally started, it usually needs to be heated. Heating helps to ensure a uniform temperature distribution in the cylinder, reduce thermal stress, and improve the efficiency and reliability of the steam turbine. The most common method is to install a heating template on relevant parts of the steam turbine. Reference can be made to the relevant content in Publication No. CN114542204A.

[0003] The essence of the heating template is a combination of electric heating wires and thermocouples. Specifically, a corresponding substrate is selected according to the outer wall curve / structural shape of the corresponding part of the steam turbine, and electric heating wires and thermocouples are laid on the substrate according to process parameters. Such a structure belongs to a customized part, mainly based on manual operation. However, it is difficult to maintain the laying path and spacing between the electric heating wires during manual operation, resulting in a more affected distance between the electric heating wires after the processed heating template is attached to the steam turbine, directly affecting the heating effect of the electric heating wires on local positions of the steam turbine. For this, the present application proposes a solution. Summary of the Invention

[0004] The purpose of the present invention is to provide a heating template forming and processing welding process applied to steam turbines. Regarding the forming process of the heating template used in steam turbines, since it is mainly based on manual operation, it is difficult to maintain the laying path and spacing between the electric heating wires, resulting in the heating effect after subsequent application to the steam turbine.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A heating template forming and processing welding process applied to steam turbines, which is applied in the production process of the heating template, includes a raw material cutting step, a wiring step, a wire fixing step, and a welding step. A welding tooling is provided in the wiring step, the wire fixing step, and the welding step, and the heating template includes a raw material sheet and an electric heating wire assembly;

[0006] Raw material cutting step: Cut a raw material sheet with a corresponding contour according to the outer wall curve of the corresponding part of the steam turbine, and cut out a number of mounting gaps on the raw material sheet;

[0007] The wiring step, the wire fixing step, and the welding step are carried out synchronously through the welding tooling, and include the following steps:

[0008] Step 1: Preset the laying path of the electric heating wire assembly on the raw material sheet according to the opening position of the mounting gap;

[0009] Step 2: Preliminarily fix the local position of the electric heating wire assembly with the welding tooling according to the laying path of the electric heating wire assembly;

[0010] Step 3: In Step 2, perform wire fixing and electric welding on the preliminarily fixed heating wire assembly. In the wire fixing step, tighten the heating wire assembly on the raw material piece with alloy steel wire, and finally weld the heating wire assembly on the raw material piece by methods such as argon arc welding. Complete the wire fixing and welding process of the heating wire assembly in the order of Step 1 to Step 3 and obtain a heating template.

[0011] Step 4: Affix the heating template obtained in Step 3 to the curved surface position of the outer wall of the steam turbine through the opening position of the installation notch.

[0012] It is further set that: the laying path of the heating wire assembly in the wire laying step is expressed as that the heating wire assembly is in a continuously bent state along the cross-sectional area of the raw material piece, and the heating wire assembly includes a heating wire and a thermocouple.

[0013] It is further set that: the welding work includes an installation sleeve and a central tooling seat. The installation sleeve is arranged on both sides of the central tooling seat, and an adjusting guide rod is slidably installed on the central tooling seat along the direction perpendicular to the surface of the central installation seat.

[0014] It is further set that: a wire pressing cone is installed at the bottom end position of the adjusting guide rod, and the lower side position of the wire pressing cone matches the outer curved surface of the heating wire assembly.

[0015] It is further set that: the number of adjusting guide rods is three, and the three adjusting guide rods are arranged in a triangular pattern.

[0016] It is further set that: a wire pressing wheel corresponding to the heating wire assembly is rotatably installed inside the installation sleeve, and the installation sleeve and the heating wire assembly are arranged on one side of the raw material piece, and a corresponding magnetic base is arranged on the other side of the raw material piece;

[0017] An energized winding coil corresponding to the magnetic base is arranged in the installation sleeve, and balls are arranged on both sides of the magnetic base and the installation sleeve corresponding to the raw material piece.

[0018] It is further set that: cylinder support rods are arranged on both sides of the central tooling seat corresponding to the installation sleeve. One end of the cylinder support rod is a sphere, and the cylinder support rod is movably connected to the installation sleeve through the sphere.

[0019] The present invention has the following beneficial effects:

[0020] 1. For the manufacturing process of the heating template in a steam turbine, first, raw material sheets of corresponding specifications are customized according to the outer wall surface of the corresponding part of the steam turbine, and equidistant wiring is carried out based on the cross-sectional area of the raw material sheets. The overall process is mainly manual, and a welding tooling is proposed for optimizing the overall operation process. The welding tooling plays an auxiliary fixing role for the electric wire heating element assembly during the wiring process, so as to simplify the manual welding process of the electric wire heating element, and the welding tooling is mainly used to maintain the spacing of the electric wire heating element assembly during the wiring process.

[0021] 2. In the welding tooling, mainly through an indirect magnetic clamping method, it plays an auxiliary fixing role in the guiding process of the electric wire heating element assembly by cooperating with the wire pressing wheel. The key lies in the central tooling seat in the middle position between the two. The central tooling seat is provided with wire pressing cones arranged in a triangular pattern, whose purpose is to secondarily fix the electric wire heating element assembly, and it is key to cooperate with the bending area during the wiring of the electric wire heating element. Moreover, the wiring, wire fixing, and welding processes are carried out synchronously, further maintaining the laying path of the electric wire heating element assembly during the welding process, and ensuring the heating effect of the subsequent heating template on the steam turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a mounting position diagram of the heating template in the heating template forming and processing welding process applied to the steam turbine proposed by the present invention;

[0024] Figure 2 It is a structural schematic diagram of the heating template in the heating template forming and processing welding process applied to the steam turbine proposed by the present invention;

[0025] Figure 3 It is a front view of the heating template in the heating template forming and processing welding process applied to the steam turbine proposed by the present invention;

[0026] Figure 4 It is a structural schematic diagram of the welding tooling in the heating template forming and processing welding process applied to the steam turbine proposed by the present invention;

[0027] Figure 5 It is proposed by the present invention for the heating template forming and processing welding process applied to the steam turbine Figure 5 partial sectional view;

[0028] Figure 6Schematic diagram of the structure of the central tooling seat in the heating template forming processing and welding process applied to a steam turbine proposed by the present invention;

[0029] Figure 7 Schematic diagram of the structure of the wire pressing cone in the heating template forming processing and welding process applied to a steam turbine proposed by the present invention.

[0030] In the figure: 1. Heating template; 2. Steam turbine; 3. Installation notch; 4. Electric heating wire assembly; 5. Installation sleeve; 6. Magnetic base; 7. Wire pressing wheel; 8. Wire pressing cone; 9. Adjusting guide rod; 10. Central tooling seat; 11. Cylinder support rod; 12. Energized winding coil. Specific implementation manners

[0031] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0032] Embodiment 1: For the forming process of the heating template used in a steam turbine, since it is mainly manual operation, it is difficult to maintain the laying path and spacing between the electric heating wires, resulting in the heating effect after subsequent application to the steam turbine. The following technical solutions are proposed:

[0033] Refer to Figures 1 to 3 , the heating template forming processing and welding process applied to a steam turbine in this embodiment is applied to the manufacturing process of the heating template 1, including raw material cutting steps, wiring steps, wire fixing steps, and electric welding steps. Welding tooling is provided in the wiring steps, wire fixing steps, and electric welding steps, and the heating template 1 includes a raw material sheet and an electric heating wire assembly 4;

[0034] Raw material cutting step: Cut a raw material sheet with a corresponding contour according to the outer wall curve of the corresponding part of the steam turbine 1, and cut out a number of installation notches 3 on the raw material sheet;

[0035] The wiring steps, wire fixing steps, and electric welding steps are carried out synchronously through welding tooling, and include the following steps:

[0036] Step 1: Preset the laying path of the electric heating wire assembly 4 on the raw material sheet according to the opening position of the installation notch 3;

[0037] Step 2: Preliminarily fix the local position of the electric heating wire assembly 4 with welding tooling according to the laying path of the electric heating wire assembly 4;

[0038] Step 3: In Step 2, the preliminarily fixed heating wire assembly 4 is wire-fixed and welded. In the wire-fixing step, the heating wire assembly 4 is tightened on the raw material sheet with alloy steel wire, and finally the heating wire assembly 4 is welded on the raw material sheet by means of argon arc welding or the like. The wire-fixing and welding process of the heating wire assembly 4 is completed in accordance with the sequence of Step 1 to Step 3, and the heating template 1 is obtained.

[0039] Step 4: The heating template 1 obtained in Step 3 is applied to the outer wall curved surface position of the steam turbine 2 through the opening position of the installation notch 3.

[0040] In the wiring step, the laying path of the heating wire assembly 4 is shown as the heating wire assembly 4 being in a continuously bent state along the cross-sectional area of the raw material sheet. The heating wire assembly 4 includes a heating wire and a thermocouple.

[0041] Working principle: Illustrated by Figure 1 The heating template 1 proposed in the present invention is mainly used for the heating process of a local position of the steam turbine 2. During the manufacturing process, specifically, it is customized according to the corresponding position in the steam turbine 2. Referring to Figure 1 the setting position of the heating template 1 in

[0042] for explanation, first, the raw material sheet is customized according to the outer wall curved surface at the corresponding position of the steam turbine 2. Specifically, the raw material sheet is laid on the corresponding position of the steam turbine 2 so that the raw material sheet completely fits the outer wall curved surface of the steam turbine 2. The raw material sheet can be composed of stainless steel sheets, and several installation notches 3 need to be opened according to the setting positions of structures such as screws on the steam turbine 2. The purpose is to ensure that the manufactured heating template 1 can be directly installed on the steam turbine 2. Figure 2 and Figure 3 Secondly, the heating wire assembly 4 is laid on the cut raw material sheet. Specifically, reference can be made to

[0043] It should be noted in combination with the above content that the overall operation process is still mainly manual, but a welding tooling is synchronously added in the overall process. The role of the welding tooling is to simplify the overall manual operation difficulty. Through the welding tooling, three actions of wiring, wire fixing and welding are synchronously carried out on the heating wire assembly 2 at the local position. Its essence is that the overall operation process is carried out successively, and the three actions of wiring, wire fixing and welding are completed one by one in accordance with the preset laying path.

[0044] Embodiment 2: An explanation is given for the welding tooling proposed in Embodiment 1:

[0045] Referring to Figures 4 to 7 , the welding work includes an installation sleeve 5 and a central tooling seat 10. The installation sleeve 5 is arranged on both sides of the central tooling seat 10. A regulating guide rod 9 is slidably installed on the central tooling seat 10 along a direction perpendicular to the surface of the central mounting seat 10. A wire pressing cone 8 is installed at the bottom end of the regulating guide rod 9. The lower side position of the wire pressing cone 8 matches the outer curved surface of the heating wire assembly 4. The number of regulating guide rods 9 is three, and the three regulating guide rods 9 are arranged in a triangular pattern. A wire pressing wheel 7 corresponding to the heating wire assembly 4 is rotatably installed inside the installation sleeve 5. The installation sleeve 5 and the heating wire assembly 4 are arranged on one side of the raw material sheet, and a corresponding magnetic base 6 is arranged on the other side of the raw material sheet;

[0046] An energized winding coil 12 corresponding to the magnetic base 6 is arranged in the installation sleeve 5. Ball bearings are arranged on one side of the magnetic base 6 and the installation sleeve 5 corresponding to the raw material sheet. Cylinder support rods 11 are arranged on both sides of the central tooling seat 10 corresponding to the installation sleeve 5. One end of the cylinder support rod 11 is a sphere, and the cylinder support rod 11 is movably connected to the installation sleeve 5 through the sphere.

[0047] Scheme description: Referring to Figures 4 to 7 for description, first, the heating wire assembly 4 is passed through the two wire pressing wheels 7, and the magnetic base 6 is placed on the other side of the raw material sheet, and the energized winding coil 12 is energized to generate a suction force between the magnetic base 6 and the energized winding coil 12, so that the overall welding tooling can be adsorbed on the raw material sheet. It should be simply noted here that the suction force intensity between the magnetic base 6 and the energized winding coil 12 can be increased by increasing the input current of the energized winding coil 12, so that the overall welding tooling is completely fixed on the raw material sheet, thus completing the fixation of the heating wire assembly 4; on the contrary, the input current of the energized winding coil 12 can be reduced to reduce the suction force intensity between the magnetic base 6 and the energized winding coil 12, but it is necessary to ensure that the overall welding tooling can be adsorbed on the raw material sheet without falling, and the welding tooling can move freely on the raw material sheet;

[0048] Therefore, through the free movement process of the overall welding tooling, it is ensured that the heating wire assembly 4 is always laid along the preset laying path. The key points are as follows: A pneumatic telescopic rod structure is formed between the cylinder rod 11 and the central tooling seat 10, ensuring that the cylinder rod 11 slides freely along the linear direction of the central tooling seat 10. Moreover, it is necessary to ensure that one end of the cylinder rod 11 can move freely with the mounting sleeve 5. The purpose is to ensure that the overall welding tooling rotates freely at an angle in accordance with the laying path of the heating wire assembly 4, enabling the wire pressing wheel 7 to move independently in accordance with the laying path of the heating wire assembly 4 and avoiding problems of mutual interference in movement;

[0049] The key points are as follows: The central tooling seat 10 can move independently relative to the two mounting sleeves 5. Since it is necessary to ensure that the raw material piece fits perfectly with the steam turbine 2, the raw material piece is not completely horizontal but has a slope in the vertical direction. For this, it is necessary to ensure that the two mounting sleeves 5 are completely fixed on the raw material piece, but the central tooling seat 10 can freely offset in the up and down direction relative to the mounting sleeve 5. The purpose is to ensure that the three wire pressing cones 8 always contact the surface of the raw material piece. For this, it is further necessary to limit that the three adjusting guide rods 9 can slide along the central working seat 10. The key points can be referred to Figure 7 , The three wire pressing cones 8 are arranged in a triangular pattern, ensuring that the heating wire assembly 4 is just completely "locked" by the three wire pressing cones 8 to limit its position. The purpose is to meet the bending requirements during the laying of the heating wire assembly 4;

[0050] Take Figure 3 the laying path of the heating wire assembly 4 in

[0051] as an example. When the welding tooling moves to the corresponding bending area, first, the two wire pressing wheels 7 fix the heating wire assembly 4 at a local position. During this process, the heating wire assembly 4 between the two mounting sleeves 5 can be fixed and welded synchronously. The wire fixing process is to fix the heating wire assembly 4 on the raw material piece with materials such as Inconel alloy steel wire, and further select the welding position according to the wire fixing position of the heating wire assembly 4, and perform actions such as argon arc welding at this position;

[0052] In summary: Using materials such as stainless steel sheets as the raw material pieces, cutting the raw material pieces of corresponding specifications according to the structural curved surface shape of the steam turbine, and performing equidistant wiring based on the cross-sectional area of the raw material pieces. Compared with the conventional operation method, the overall welding process uses a welding tooling, which is mainly used to assist in fixing the heating wire assembly;

[0053] During the manual operation process, with manual operation being the main method and the welding tooling being the auxiliary, and by using the welding tooling in cooperation, the wiring, wire fixing, and welding actions of the heating wire assembly can be carried out synchronously. Through the auxiliary operation of the welding tooling, the local heating wire assembly can be fixed to maintain the spacing during the wiring action, and the wire fixing and welding actions can be carried out synchronously. The overall operation process can simplify the steps of manually welding the heating wire and ensure the heating effect of the subsequent heating template on the steam turbine.

[0054] The above content is only an example and illustration of the structure of the present invention. Those skilled in the art of this technology can make various modifications or supplements or use similar methods to replace the specific embodiments described, as long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should all fall within the protection scope of the present invention.

[0055] In the description of this specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0056] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not elaborate on all the details, nor do they limit the present invention to only the specific implementation manners. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments to better explain the principle and practical application of the present invention, so that those skilled in the art of this technology can well understand and utilize the present invention. The present invention is only limited by the claim book and its full scope and equivalents.

Claims

1. The heating template forming and welding process used in steam turbines is characterized by: The invention comprises a heating template (1) and a steam turbine (2), and is applied in the manufacturing process of the heating template (1), wherein the welding process comprises a raw material cutting step, a wiring step, a wire fixing step and an electric welding step, wherein the heating template (1) comprises a raw material sheet and an electric heating wire assembly (4), and welding tooling is provided in the wiring step, the wire fixing step and the electric welding step; The raw material cutting step is as follows: cutting the raw material sheet with the corresponding contour according to the outer wall curved surface of the corresponding part of the steam turbine (1), and cutting a plurality of mounting notches (3) on the raw material sheet; The wiring step, the wire fixing step and the electric welding step are carried out simultaneously by the welding tool and include the following steps: Step 1: Preset the laying path of the heating wire assembly (4) on the raw material sheet by opening the installation notch (3); Step 2: Preliminarily fix the local position of the heating wire assembly (4) using a welding tool according to the laying path of the heating wire assembly (4); Step 3: Fixing and welding the preliminarily fixed heating wire assembly (4). In the fixing step, the heating wire assembly (4) is tightened on the raw material sheet with an alloy steel wire. Finally, the heating wire assembly (4) is welded to the raw material sheet by argon arc welding. The fixing and welding process of the heating wire assembly (4) is completed in the order of steps 1 to 3 to obtain the heating template (1). Step 4: The heating template (1) obtained in step 3 is applied to the curved surface of the outer wall of the steam turbine (2) through the opening of the installation notch (3).

2. The heating template forming and welding process for steam turbine according to claim 1 is characterized in that: The laying path of the heating wire assembly (4) in the wiring step is represented by the heating wire assembly (4) being in a continuous bending state along the cross-sectional area of the raw material sheet, and the heating wire assembly (4) includes a heating wire and a thermocouple.

3. The heating template forming and welding process for steam turbine according to claim 1 is characterized in that: The welding tool comprises a mounting sleeve (5) and a central tool seat (10), wherein the mounting sleeve (5) is arranged at two sides of the central tool seat (10), and an adjusting guide rod (9) is slidably mounted on the central tool seat (10) in a direction perpendicular to the surface of the central mounting seat (10).

4. The heating template forming and welding process for steam turbine according to claim 3 is characterized in that: A wire pressing cone (8) is installed at the bottom end of the adjusting guide rod (9), and the lower side of the wire pressing cone (8) matches the outer curved surface of the heating wire assembly (4).

5. The heating template forming and welding process for steam turbine according to claim 3 is characterized in that: The number of the adjustment guide rods (9) is three, and the three adjustment guide rods (9) are arranged along a herringbone shape.

6. The heating template forming and welding process for steam turbine according to claim 3 is characterized in that: A crimping wheel (7) corresponding to the heating wire assembly (4) is rotatably mounted inside the mounting sleeve (5), and the mounting sleeve (5) and the heating wire assembly (4) are arranged on one side of the raw material sheet, and a corresponding magnetic base (6) is arranged on the other side of the raw material sheet; The mounting sleeve (5) is provided with an energized winding coil (12) corresponding to the magnetic base (6), and balls are provided on one side of the magnetic base (6) and the mounting sleeve (5) corresponding to the raw material sheet.

7. The heating template forming and welding process for steam turbine according to claim 3 is characterized in that: Cylinder support rods (11) are provided on both sides of the central tooling seat (10) corresponding to the mounting sleeve (5), one end of the cylinder support rod (11) is a sphere, and the cylinder support rod (11) is movably connected to the mounting sleeve (5) through the sphere.

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