Heating template forming machining welding process applied to steam turbine

Abstract

The invention discloses a heating template forming, processing and welding process applied to a steam turbine, which is characterized in that materials such as stainless steel sheets and the like are used as raw material sheets, the raw material sheets with corresponding specifications are cut by matching with the structural curved surface appearance of the steam turbine, and equidistant wiring is carried out on the basis of the cross section area of the raw material sheets. A welding tool is used in the whole welding process in a matched mode, the welding tool is mainly used for achieving the auxiliary fixing effect on the electric heating wire assembly, in the manual operation process, manual operation is taken as a main mode, the welding tool is taken as an auxiliary mode, the welding tool is used in a matched mode, and wiring, wire fixing and welding actions can be synchronously conducted on the electric heating wire assembly; through auxiliary operation of the welding tool, the local electric heating wire assembly is fixed to maintain the distance in the wiring action, wire fixing and welding actions are synchronously carried out, the step of manually welding the electric heating wires can be simplified in the whole operation process, and the heating effect of a subsequent heating template on a steam turbine is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of welding technology, and in particular to a heating template forming processing welding technology applied to a steam turbine. Background Art

[0002] The steam turbine usually needs to be heated after normal startup. Heating helps to ensure 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 the relevant parts of the steam turbine. Please refer to the relevant content in the publication number CN114542204A.

[0003] The essence of the heating template is a combination of heating wires and thermocouples. Specifically, the corresponding substrate is selected according to the outer wall curve / structural shape of the corresponding part of the turbine, and the heating wires and thermocouples are laid on the substrate according to the process parameters. This type of structure is a customized part and is mainly operated manually. However, it is difficult to maintain the laying path and spacing between the heating wires during manual operation, which causes the processed heating template to be attached to the turbine, further affecting the distance between the heating wires, directly affecting the heating effect of the heating wires on the local position of the turbine. This application proposes a solution. Summary of the invention

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

[0005] The purpose of the present invention can be achieved by the following technical scheme: a heating template forming and processing welding process applied to a steam turbine, applied to the manufacturing process of the heating template, including a raw material cutting step, a wiring step, a wire fixing step and an electric welding step, wherein welding tooling is provided in the wiring step, the wire fixing step and the electric welding step, and the heating template includes a raw material sheet and an electric heating wire assembly;

[0006] Raw material cutting step: cutting the raw material sheet with the corresponding contour according to the outer wall curved surface of the corresponding part of the steam turbine, and cutting a plurality of installation notches on the raw material sheet;

[0007] The wiring step, the wire fixing step and the electric welding step are performed simultaneously by a welding tool, and include the following steps:

[0008] Step 1: Preset the laying path of the heating wire assembly on the raw material sheet by setting the opening position of the installation notch;

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

[0010] Step 3: In step 2, the heating wire assembly that has been initially fixed is fixed and welded. In the fixing step, the heating wire assembly is tightened on the raw material sheet with an alloy steel wire, and finally the heating wire assembly is welded on the raw material sheet by argon arc welding or the like. The fixing and welding process of the heating wire assembly is completed in the order of step 1 to step 3 to obtain a heating template;

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

[0012] It is further configured as follows: in the wiring step, the laying path of the heating wire assembly is represented by the heating wire assembly being in a continuously bent state along the cross-sectional area of ​​the raw material sheet, and the heating wire assembly includes a heating wire and a thermocouple.

[0013] It is further configured as follows: the welding work includes a mounting sleeve and a central tooling seat, the mounting sleeve is arranged on both sides of the central tooling seat, and an adjusting guide rod is slidably installed on the central tooling seat in a direction perpendicular to the surface of the central mounting seat.

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

[0015] It is further configured as follows: the number of adjustment guide rods provided is three, and the three adjustment guide rods are provided in a herringbone shape.

[0016] It is further configured as follows: a crimping 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 sheet, and a corresponding magnetic base is arranged on the other side of the raw material sheet;

[0017] The installation sleeve is provided with an energized winding coil corresponding to the magnetic base, and balls are provided on one side of the magnetic base and the installation sleeve corresponding to the raw material sheet.

[0018] It is further configured as follows: cylinder support rods are arranged on both sides of the central tooling seat corresponding to the mounting sleeve, one end of the cylinder support rod is a sphere, and the cylinder support rod is movably connected to the mounting sleeve through the sphere.

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

[0020] 1. Regarding the manufacturing process of the heating template in the steam turbine, first, the raw material sheet of corresponding specifications is customized based on the outer wall surface of the corresponding part of the steam turbine, and the equidistant wiring is performed based on the cross-sectional area of ​​the raw material sheet. The whole process is mainly manual operation, and a welding tool is proposed to optimize the overall operation process. The welding tool plays an auxiliary fixing role for the heating wire assembly during the wiring process, thereby simplifying the manual welding of the heating wire process, and the welding tool is mainly used to maintain the spacing of the heating wire assembly during the wiring process;

[0021] 2. In the welding tooling, indirect magnetic clamping is mainly used to cooperate with the crimping wheel to assist in fixing the guiding process of the heating wire assembly. The key lies in the central tooling seat in the middle of the two. The central tooling seat is provided with a crimping cone in a herringbone shape. Its purpose is to perform secondary fixation on the heating wire assembly. The key is to cooperate with the bending area when the heating wire is wired, and the wiring, fixing and welding processes are carried out simultaneously to further maintain the laying path of the heating wire assembly during the welding process and ensure the heating effect of the subsequent heating template on the turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

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

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

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

[0027] Figure 5 The invention proposes a heating template forming and welding process for steam turbines. Figure 5 A partial cutaway view of

[0028] Figure 6It is a structural schematic diagram of a center tooling seat in a heating template forming processing welding process applied to a steam turbine proposed by the present invention;

[0029] Figure 7 This is a schematic structural diagram of a wire pressing cone in a heating template forming 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. Heating wire assembly; 5. Installation sleeve; 6. Magnetic base; 7. Wire crimping wheel; 8. Wire crimping cone; 9. Adjustment guide rod; 10. Center tooling seat; 11. Cylinder support rod; 12. Energized winding coil. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1: The forming process of the heating template used in the steam turbine is mainly operated manually, and it is difficult to maintain the laying path and spacing between the heating wires, resulting in the heating effect after being subsequently applied to the steam turbine. The following technical solution is proposed:

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

[0034] The raw material cutting step: 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 installation notches 3 on the raw material sheet;

[0035] The wiring step, the wire fixing step and the electric welding step are performed simultaneously by a welding tool, and include the following steps:

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

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

[0038] Step 3: In step 2, the heating wire assembly 4 that is initially fixed is fixed and welded. In the fixing step, the heating wire assembly 4 is tightened on the raw material sheet with an alloy steel wire, and finally the heating wire assembly 4 is welded on the raw material sheet by argon arc welding or the like. The fixing and welding process of the heating wire assembly 4 is completed in the order of step 1 to step 3 to obtain the heating template 1;

[0039] Step 4: applying the heating template 1 obtained in step 3 to the curved surface of the outer wall of the steam turbine 2 through the opening of the installation notch 3;

[0040] 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.

[0041] Working principle: Figure 1 To illustrate, the heating template 1 proposed by the present invention is mainly used for the heating process of the local position of the steam turbine 2. During the manufacturing process, it is specifically customized according to the corresponding position in the steam turbine 2. Figure 1 The setting position of the heating template 1 is explained. First, the raw material sheet is customized according to the outer wall curved surface in 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 is completely in contact with the outer wall curved surface of the steam turbine 2. The raw material sheet can be composed of a stainless steel sheet, and a number of installation notches 3 need to be opened according to the setting position of the screws and other structures on the steam turbine 2. The purpose is to ensure that the manufactured heating template 1 is directly installed on the steam turbine 2;

[0042] Secondly, the heating wire assembly 4 is laid on the raw material sheet obtained after cutting. For details, please refer to Figure 2 and Figure 3 , in essence, the heating wire assembly 4 is continuously bent in accordance with the cross-sectional area of ​​the raw material sheet to ensure that the spacing between the bent heating wire assemblies 4 is equal, and because the structural shapes of the steam turbine 2 are different, the specifications of the cut raw material sheets are different, so the laying path of the heating wire assembly 4 is not specifically limited in the present invention, and in the wiring process, only the local position of the heating wire assembly 4 needs to be welded, and welding technology such as argon arc welding can be used specifically, but in order to ensure the fixed state of the heating wire assembly 4, it needs to be further fixed according to the above-mentioned welding position, and its essence is to fix the heating wire assembly 4 by materials such as chromium-nickel-iron alloy steel wire;

[0043] In combination with the above content, it should be explained that: the overall operation process is still mainly manual operation, but welding tooling is added simultaneously during the overall process. The role of the welding tooling is to simplify the overall manual operation difficulty. The welding tooling is used to simultaneously perform wiring, wire fixing and welding on the local position of the heating wire assembly 2. Its essence is: the overall operation process is carried out step by step, and the three actions of wiring, wire fixing and welding are completed one by one in conjunction with the preset laying path.

[0044] Embodiment 2: Explanation of the welding tooling proposed in Embodiment 1:

[0045] Reference Figures 4 to 7 The welding work includes an installation sleeve 5 and a center tooling seat 10. The installation sleeve 5 is arranged on both sides of the center tooling seat 10. An adjusting guide rod 9 is slidably installed on the center tooling seat 10 in a direction perpendicular to the surface of the center installation seat 10. A crimping cone 8 is installed at the bottom end of the adjusting guide rod 9. The lower side of the crimping cone 8 matches the outer curved surface of the heating wire assembly 4. There are three adjusting guide rods 9, and the three adjusting guide rods 9 are arranged in a Chinese-Pin shape. A crimping wheel 7 corresponding to the heating wire assembly 4 is rotatably installed inside the installation sleeve 5, and 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] The mounting sleeve 5 is provided with an energized winding coil 12 corresponding to the magnetic base 6. Ball bearings are provided on one side of the magnetic base 6 and the mounting sleeve 5 corresponding to the raw material sheet. The central tooling seat 10 is provided with cylinder support rods 11 on both sides of 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.

[0047] Solution Description: Refer to Figures 4 to 7 To explain, first, the heating wire assembly 4 is passed through the two crimping 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 suction between the magnetic base 6 and the energized winding coil 12, so that the overall welding tool can be adsorbed on the raw material sheet. It should be briefly explained that: the suction strength 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 tool is completely fixed on the raw material sheet, thereby completing the fixation of the heating wire assembly 4; conversely, the input current of the energized winding coil 12 can be reduced to reduce the suction strength between the magnetic base 6 and the energized winding coil 12, but it is necessary to ensure that the overall welding tool can be adsorbed on the raw material sheet and will not fall off, and the welding tool 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 electric heating wire assembly 4 is always laid along the preset laying path. The key content is: a pneumatic telescopic rod and other structures are formed between the cylinder support rod 11 and the central tooling seat 10 to ensure that the cylinder support rod 11 slides freely along the linear direction of the central tooling seat 10, and it is also necessary to ensure that one end of the cylinder support rod 11 and the mounting sleeve 5 can move freely. The purpose is to ensure that the overall welding tooling cooperates with the laying path of the electric heating wire assembly 4 to freely rotate the angle, so that the crimping wheel 7 can independently move with the laying path of the electric heating wire assembly 4 to avoid the problem of mutual interference.

[0049] The key content is: the central tooling seat 10 can move independently relative to the two mounting sleeves 5. Because it is necessary to ensure that the raw material sheet is completely in contact with the steam turbine 2, the raw material sheet 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 sheet, but the central tooling seat 10 can be freely offset in the up and down directions relative to the mounting sleeves 5. The purpose is to ensure that the three pressing cones 8 are always in contact with the surface of the raw material sheet. For this, it is necessary to further limit the three adjustment guide rods 9 to slide along the central working seat 10. The key content can be referred to Figure 7 The three pressing cones 8 are arranged in a herringbone shape to ensure that the heating wire assembly 4 is completely "stuck" by the three pressing cones 8 and the position is restricted, and the purpose is to meet the bending requirements of the heating wire assembly 4 when laying;

[0050] by Figure 3 Taking the laying path of the middle electric heating wire assembly 4 as an example, when the welding tool moves to the corresponding bending area, the middle electric heating wire assembly 4 is first fixed at a local position with two wire pressing wheels 7. In this process, the electric heating wire assembly 4 between the two mounting sleeves 5 can be simultaneously fixed and welded. The fixing process is to fix the electric heating wire assembly 4 on the raw material sheet with materials such as chromium-nickel-iron alloy steel wire, and further select the welding position according to the fixing position of the electric heating wire assembly 4, and perform argon arc welding and other actions at this position;

[0051] After completing the above actions, the input current of the energized winding coil 12 is further reduced, and the suction force between the magnetic base 6 and the mounting sleeve 5 is reduced, so that the entire welding tool is moved again along the above-mentioned laying path for a distance, and then the input current of the energized winding coil 12 is increased again to re-fix the welding tool, and the above-mentioned wire fixing and welding actions are repeated. In this way, the difficulty of manual operation can be simplified.

[0052] In summary: using stainless steel sheets and other materials as raw materials, cutting raw materials of corresponding specifications according to the structural curved surface of the steam turbine, and equidistant wiring based on the cross-sectional area of ​​the raw materials, compared with the conventional operation method, the overall welding process is coordinated with the use of welding tools, which are mainly used to assist in fixing the heating wire assembly;

[0053] In the manual operation process, manual operation is mainly used and welding tooling is auxiliary. In conjunction with the use of welding tooling, the heating wire assembly can be wired, wired and welded simultaneously. Through the auxiliary operation of the welding tooling, the local heating wire assembly is fixed to maintain the spacing during the wiring action, and the wires are fixed and welded simultaneously. The overall operation process can simplify the steps of manual welding of heating wires and ensure the heating effect of the subsequent heating template on the turbine.

[0054] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

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

[0056] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A heating template forming and welding process for steam turbines, applied in the manufacturing process of a heating template (1), characterized in that: The method comprises a raw material cutting step, a wiring step, a wire fixing step and an electric welding step, wherein the wiring step, the wire fixing step and the electric welding step are provided with welding tools, and the heating template (1) comprises a raw material sheet and an electric heating wire assembly (4); The raw material cutting step: 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 installation notches (3) on the raw material sheet; The wiring step, the wire fixing step and the electric welding step are performed simultaneously by a 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 setting the opening position of 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: In step 2, the heating wire assembly (4) that has been initially fixed is fixed and welded. In the fixing step, the heating wire assembly (4) is tightened onto the raw material sheet with an alloy steel wire. Finally, the heating wire assembly (4) is welded onto the raw material sheet by argon arc welding or the like. The fixing and welding process of the heating wire assembly (4) is completed in the order of steps 1 to 3, and the heating template (1) is obtained. 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 applied to a 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 applied to a steam turbine according to claim 1 is characterized in that: The welding work comprises a mounting sleeve (5) and a central tooling seat (10), wherein the mounting sleeve (5) is arranged at two sides of the central tooling seat (10), and an adjusting guide rod (9) is slidably mounted on the central tooling 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 applied to a 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 in 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 installation sleeve (5), and 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; The installation sleeve (5) is provided with an energized winding coil (12) corresponding to the magnetic base (6), and the magnetic base (6) and the installation sleeve (5) are both provided with balls at positions on one side 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 arranged 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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