Welding surface treatment device for repairing crack surface of runner blade

Abstract

The invention discloses a welding surface treatment device for repairing a crack surface of a runner blade, and belongs to the technical field of metal cutting. The device comprises a mechanical arm, a mounting disc is arranged at the output end of the mechanical arm, a triangular plate is fixedly arranged on the bottom face of the mounting disc, a main electrode used for generating electric arcs is fixedly arranged on the triangular plate, a first auxiliary electrode and a second auxiliary electrode are further slidably arranged on the triangular plate, and a position adjusting assembly is fixedly arranged on the top face of the triangular plate; a gradient magnetic field generator used for generating a gradient magnetic field is fixedly arranged on the bottom face of the triangular plate, the main electrode, the first auxiliary electrode and the second auxiliary electrode are all arranged in an inner ring of the gradient magnetic field generator, a mounting frame is fixedly arranged on the bottom face of the triangular plate, and a pair of electrode bars is fixedly arranged on the mounting frame. A vibration assembly and an air blowing assembly are further fixedly arranged on the mounting frame, main cracks are treated through main electric arcs, branch cracks can be treated through induced electric arcs at the same time, the treatment efficiency is higher, and the treatment effect is better.

Description

Technical Field

[0001] The invention belongs to the technical field of metal cutting, and in particular relates to a welding surface processing device for repairing cracked surfaces of runner blades. Background Art

[0002] The runner blades are the core components of the steam turbine and water turbine power mechanisms. During use, the runner blades are subjected to alternating loads such as water flow impact and unit start-up and shutdown for a long time, which causes fatigue cracks to appear on the welding edges and geometric mutation points of the runner blades. In order to avoid further damage to the runner blades, the cracks will be cleaned by mechanical grinding, arc cutting and other methods. After the cracks are cleaned, the weld surface will be processed and welded.

[0003] The above-mentioned crack cleaning generally adopts arc cutting of metal, and its essence is to melt the metal at the crack through the arc to ensure that the crack is eliminated. Although the arc cutting metal method has been widely used in the field of metal repair, it still has many defects, as follows: The existing crack treatment method is to melt the main crack through a single main arc. The main crack is treated first, and then the branch crack is treated. The main crack and the branch crack cannot be treated at the same time, and the efficiency is low. In addition, when the branch crack is treated after the main crack is treated, the intersection of the main crack and the branch crack will experience at least two meltings, which is easy to cause additional damage to the substrate.

[0004] Therefore, we propose a welding surface processing device for repairing the crack surface of a runner blade in order to solve the above-mentioned problems. Summary of the Invention

[0005] In view of the problems in the prior art that the main crack and branch cracks cannot be treated at the same time, and that when the branch cracks are treated after the main crack is treated, the intersection of the main crack and the branch crack will undergo at least two melting processes, which may easily cause additional damage to the substrate, the purpose of the present invention is to provide a welding surface treatment device for repairing the crack surface of a runner blade.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is as follows: a welding surface processing device for repairing the crack surface of a runner blade, comprising a mechanical arm for adjusting the crack cleaning distance and angle, the output end of the mechanical arm is provided with a mounting plate for mounting parts, a triangular plate is fixedly provided on the bottom surface of the mounting plate, a main electrode for generating an arc is fixedly provided on the triangular plate, auxiliary electrode one and auxiliary electrode two are also slidably provided on the triangular plate, a positioning assembly is fixedly provided on the top surface of the triangular plate, the runner blade is placed below the main electrode, auxiliary electrode one and auxiliary electrode two, a gradient magnetic field generator for generating a gradient magnetic field is fixedly provided on the bottom surface of the triangular plate, the main electrode, auxiliary electrode one and auxiliary electrode two are all arranged in the inner circle of the gradient magnetic field generator, a mounting frame is fixedly provided on the bottom surface of the triangular plate, a pair of electrode rods are fixedly provided on the mounting frame, a vibration assembly for generating high-frequency vibration and a blowing assembly for cleaning the crack are also fixedly provided on the mounting frame, and the vibration assembly and the blowing assembly are fixedly connected.

[0007] Furthermore, the main electrode, auxiliary electrode 1 and auxiliary electrode 2 are arranged in an isosceles triangle shape, the main electrode is located in front of the auxiliary electrode 1 and auxiliary electrode 2, and the main electrode, auxiliary electrode 1 and auxiliary electrode 2 are arranged at the same horizontal height.

[0008] Furthermore, the triangular plate includes several fixed columns fixedly installed on the bottom surface of the mounting plate, and a plate body is fixedly installed on the bottom surface of the several fixed columns. Two sliding grooves are symmetrically opened on the plate body, and auxiliary electrode 1 and auxiliary electrode 2 are respectively correspondingly installed in the inner cavity of the two sliding grooves.

[0009] Furthermore, the positioning assembly includes a fixing seat fixedly mounted on the top surface of the plate body, electric push rods are symmetrically fixedly mounted on the outer walls on both sides of the fixing seat, connecting ears are fixedly mounted on the top surfaces of auxiliary electrode one and auxiliary electrode two, and the output end of the electric push rod is rotatably connected to the connecting ear.

[0010] Furthermore, the gradient magnetic field generator includes a bracket fixedly mounted on the bottom surface of the plate, and a plurality of gradient coils are fixedly mounted on the bracket.

[0011] Furthermore, the gradient magnetic field generated by the gradient coil decreases gradually from the main electrode to the surrounding areas.

[0012] Furthermore, the mounting frame includes a pair of mounting plates symmetrically fixedly mounted on the bottom surface of the mounting plate, a crossbeam is fixedly mounted on the side walls of the two mounting plates, and electrode rods are fixedly mounted on the lower ends of the two mounting plates.

[0013] Furthermore, a high-frequency pulse power supply is supplied to the two electrode rods to generate pressure waves around the tips of the two electrode rods, and the pressure waves diffuse in a "spherical" manner.

[0014] Furthermore, the vibration assembly includes a metal vibration plate fixedly mounted on the crossbeam, and a connecting rod is fixedly mounted on the side wall of the lower end of the metal vibration plate.

[0015] Furthermore, the blowing assembly includes a pair of L-shaped fixing rods fixedly mounted on the crossbeam, an air chamber is fixedly mounted on the lower ends of the two L-shaped fixing rods, a one-way air intake valve is fixedly mounted on the top surface of the air chamber, a diaphragm is fixedly mounted in the inner cavity of the air chamber, a through hole is opened on the side wall of the air chamber facing the metal vibrator, the metal vibrator and the diaphragm are fixedly connected by a connecting rod, and the connecting rod is arranged in the inner cavity of the through hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can simultaneously use the induced arc to treat the branch cracks while using the main arc to treat the main cracks, which has higher treatment efficiency and better effect.

[0017] 2. In the process of treating the main crack and the branch crack, the main arc and the induced arc are directly separated at the intersection of the main crack and the branch crack, and the intersection will not be repeatedly melted, thereby reducing the probability of additional damage to the substrate due to repeated melting.

[0018] 3. The induced arc and gradient magnetic field in the present invention are in a state of dynamic adjustment in real time, and can automatically adjust the generation and extinction of the induced arc according to the crack morphology. It is not only energy-saving but also has strong adaptability and flexibility in use.

[0019] 4. When the present invention does not process the branch cracks, it can utilize the magnetic field to make the main arc maintain its arc trajectory more stably, thereby accurately cleaning the main cracks.

[0020] 5. The present invention can utilize the magnetic field to enable the main arc to maintain its arc trajectory more stably, thereby accurately cleaning the main crack.

[0021] 6. After the cracks are cleaned, the present invention can utilize the magnetic field to make the main arc maintain its arc trajectory more stably, thereby accurately cleaning the main cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the layout of the main electrode, auxiliary electrode 1, auxiliary electrode 2 and gradient magnetic field generator of the present invention; Figure 3 Schematic diagram of the three-dimensional structure of the gradient magnetic field generator of the present invention; Figure 4 Schematic diagram of the three-dimensional structure of the set square of the present invention; Figure 5 for Figure 4 A magnified view of point A; Figure 6 Schematic diagram of the main electrode, auxiliary electrode 1 and auxiliary electrode 2 of the present invention for treating main cracks and branch cracks; Figure 7 is a cross-sectional schematic diagram of the vibration component and the blowing component of the present invention; Figure 8 for Figure 7 Enlarged view of point B; Figure 9 Schematic diagram of the gradient magnetic field distribution of the present invention; Figure 10 Schematic diagram of the pressure wave diffusion path of the present invention; Figure 11 It is a schematic diagram of the three-dimensional structure of the position adjustment component of the present invention.

[0023] In the figure: 1. Robotic arm; 2. Mounting plate; 3. Triangular plate; 31. Plate body; 32. Slide groove; 33. Fixed column; 4. Main electrode; 5. Electrode 1; 6. Auxiliary electrode 2; 7. Gradient magnetic field generator; 71. Bracket; 72. Gradient coil; 8. Mounting frame; 81. Mounting plate; 82. Crossbeam; 9. Electrode rod; 10. Vibration assembly; 101. Metal vibrator; 102. Connecting rod; 20. Blowing assembly; 201. L-shaped fixing rod; 202. Air chamber; 203. One-way air inlet valve; 204. Through hole; 205. Diaphragm; 30. Positioning assembly; 301. Fixing seat; 302. Electric push rod; 303. Connecting ear; 40. Rotor blade. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to specific embodiments.

[0025] In order to solve the problem that the existing technology cannot treat the main crack and the branch crack at the same time, and when the branch crack is treated after the main crack is treated, the intersection of the main crack and the branch crack will experience at least two meltings, which may cause additional damage to the substrate, such as Figure 1 - Figure 11 As shown: like Figure 1 As shown, a welding surface treatment device for repairing cracked surfaces of runner blades includes a mechanical arm 1 for adjusting the crack cleaning distance and angle. The output end of the mechanical arm 1 is provided with a mounting plate 2 for mounting parts. The output end of the mechanical arm 1 is integrated with a scanning probe (not shown in the figure) for determining the direction of the crack so as to formulate a cleaning path for the crack. Figure 2-Figure 3 As shown, a triangular plate 3 is fixedly provided on the bottom surface of the mounting plate 2, a main electrode 4 for generating an arc is fixedly provided on the triangular plate 3, and an auxiliary electrode 1 5 and an auxiliary electrode 2 6 are also slidably provided on the triangular plate 3, as shown in FIG. Figure 4-Figure 5 As shown, a positioning assembly 30 is fixedly provided on the top surface of the triangle plate 3. Figure 6 As shown, the runner blades 40 are placed under the main electrode 4, the auxiliary electrode 1 5 and the auxiliary electrode 2 6. Figure 2-Figure 3 As shown, a gradient magnetic field generator 7 for generating a gradient magnetic field is fixedly provided on the bottom surface of the triangle plate 3, and the main electrode 4, the auxiliary electrode 1 5 and the auxiliary electrode 2 6 are all arranged in the inner circle of the gradient magnetic field generator 7. A mounting frame 8 is fixedly provided on the bottom surface of the triangle plate 3, and a pair of electrode rods 9 are fixedly provided on the mounting frame 8. A vibration component 10 for generating high-frequency vibration and a blowing component 20 for cleaning cracks are also fixedly provided on the mounting frame 8, and the vibration component 10 and the blowing component 20 are fixedly connected.

[0026] Specifically, during the crack treatment process, a high-frequency pulse power supply is applied to the two electrode rods 9, so that the arc between the two electrode rods 9 can form a periodically changing pressure wave, which acts on the crack of the runner blade 40 and vibrates and cleans the impurities inside the crack; Figure 10 As shown, since the pressure wave diffuses in a "spherical" manner, during the diffusion process, a part of the pressure wave will act on the vibration component 10, causing the vibration component 10 to generate high-frequency vibration. During the high-frequency vibration process, the vibration component 10 will drive the blowing component 20 to generate high-frequency pulse airflow, which is used to further clean the impurities remaining inside the crack after vibration cleaning, ensure the cleaning effect, and facilitate subsequent crack processing.

[0027] When only the main crack exists and no branch cracks exist, the main electrode 4 is energized to generate a main arc. Then, by controlling the current size, current direction, power supply timing and other parameters in the gradient magnetic field generator 7, the gradient magnetic field generator 7 generates a magnetic field parallel to the main electrode 4, the auxiliary electrode 1 5 and the auxiliary electrode 2 6. Under the action of the magnetic field, the main arc can maintain its arc trajectory more stably, thereby accurately cleaning the cracks.

[0028] like Figure 2-Figure 3 and Figure 6 As shown, the main electrode 4, the auxiliary electrode 1 5 and the auxiliary electrode 2 6 are arranged in an isosceles triangle shape, the main electrode 4 is in front of the auxiliary electrode 1 5 and the auxiliary electrode 2 6, and the main electrode 4, the auxiliary electrode 1 5 and the auxiliary electrode 2 6 are arranged at the same horizontal height.

[0029] The main electrode 4, auxiliary electrode 1 5 and auxiliary electrode 2 6 adopt the above-mentioned distribution method, so that the auxiliary electrode 1 5 and auxiliary electrode 2 6 can accurately capture the induced arc separated by the main electrode 4. In addition, this setting method can ensure the uniformity and symmetry of the induced arcs on both sides, which is conducive to better control of the arc shape and energy distribution, and thus conducive to better achieving the treatment effect of cracks.

[0030] like Figure 3-Figure 4 As shown, the triangular plate 3 includes a plurality of fixed columns 33 fixedly mounted on the bottom surface of the mounting plate 2, and a plate body 31 is fixedly mounted on the bottom surface of the plurality of fixed columns 33. Two slide grooves 32 are symmetrically provided on the plate body 31, and the auxiliary electrode 1 5 and the auxiliary electrode 2 6 are respectively slidably mounted in the inner cavities of the two slide grooves 32.

[0031] like Figure 5 As shown, the positioning assembly 30 includes a fixing base 301 fixedly mounted on the top surface of the plate body 31, and electric push rods 302 are symmetrically fixedly mounted on the outer walls on both sides of the fixing base 301, and connecting ears 303 are fixedly mounted on the top surfaces of the auxiliary electrode 1 5 and the auxiliary electrode 2 6, respectively, and the output end of the electric push rod 302 is rotatably connected to the connecting ear 303.

[0032] like Figure 3 As shown, the gradient magnetic field generator 7 includes a bracket 71 fixedly mounted on the bottom surface of the plate 31, and a plurality of gradient coils 72 are fixedly mounted on the bracket 71. When the gradient coils 72 are energized, they can generate a gradient magnetic field. The gradient magnetic field generated by the gradient coils 72 decreases gradually from the main electrode 4 to the surrounding areas.

[0033] Specifically, when a branch crack is encountered during the cleaning of the main crack, the auxiliary electrode 1 5 and the auxiliary electrode 2 6 are energized, as shown in FIG. Figure 9 As shown, at this time, by controlling the current size, current direction, power supply timing and other parameters in the gradient magnetic field generator 7, the gradient magnetic field generator 7 generates a magnetic field with a gradient decreasing from the main electrode 4 to the surrounding area. The direction of the gradient magnetic field is perpendicular to the direction of the main arc on the main electrode 4. Therefore, the main arc is subjected to a transverse Lorentz force in the gradient magnetic field. Under the excitation of the gradient magnetic field and the current, the main arc acts as an energy carrier and generates an induced arc on the auxiliary electrode 1 5 and the auxiliary electrode 2 6 in an energy coupling manner. At the same time, the electric push rod 302 and the connecting ear 303 cooperate to push the auxiliary electrode 1 5 or the auxiliary electrode 2 The auxiliary electrode 1 5 or the auxiliary electrode 2 6 slides on the slide groove 32 in the direction close to the branch crack, and at the same time controls the dynamic change of the gradient magnetic field. Under the action of the Lorentz force, the induced arc on the auxiliary electrode 1 5 or the auxiliary electrode 2 6 is pushed to move in the direction of the branch crack, and then the induced crack can be used to treat the branch crack. Since the distance between the branch crack and the main crack ranges from a few millimeters to tens of millimeters, the distance is relatively close. Through the cooperation of the electric push rod 302 and the connecting ear 303, the auxiliary electrode 1 5 or the auxiliary electrode 2 6 is pushed to slide slightly on the slide groove 32 in the direction close to the branch crack, and the induced arc can be used to treat the branch crack.

[0034] The traditional crack treatment method is to first treat the main crack and then treat the branch cracks. However, the present invention, through the above arrangement, can generate an induced arc on the auxiliary electrode 1 5 and the auxiliary electrode 2 6 when encountering a branch crack during the process of treating the main crack using the main arc on the main electrode 4. While treating the main crack, the induced arc can also be used to treat the branch cracks at the same time, which has higher treatment efficiency and better effect. In addition, using this treatment method, the main arc and the induced arc are directly separated at the intersection of the main crack and the branch crack, and there will be no repeated melting of the intersection, which reduces the probability of additional damage to the substrate due to repeated melting.

[0035] When the main crack is being processed and no branch cracks are encountered, the auxiliary electrode 1 5 and the auxiliary electrode 2 6 are powered off, and by controlling the current size, current direction, power supply timing and other parameters in the gradient magnetic field generator 7, the gradient magnetic field generator 7 generates a magnetic field parallel to the main electrode 4, the auxiliary electrode 1 5 and the auxiliary electrode 2 6. This not only saves energy, but also utilizes the magnetic field to make the main arc maintain its arc trajectory more stably, thereby accurately cleaning the main crack. This setting method is in a dynamic adjustment state in real time, and can automatically adjust the generation and extinction of the induced arc according to the crack morphology, with strong adaptability and flexibility of use.

[0036] In order to solve the problem that impurities in cracks are not thoroughly cleaned, affecting the crack treatment effect, such as Figure 3 and Figure 7 - Figure 10 As shown: like Figure 1 As shown, the mounting frame 8 includes a pair of mounting plates 81 symmetrically fixedly mounted on the bottom surface of the mounting disk 2, and a crossbeam 82 is fixedly mounted on the side walls of the two mounting plates 81. The lower ends of the two mounting plates 81 are respectively fixedly mounted with electrode rods 9. The two electrode rods 9 are connected to a high-frequency pulse power supply, and pressure waves are generated around the tips of the two electrode rods 9. The pressure waves diffuse in a "spherical" manner. Since the electrode rods 9 are connected to a high-frequency pulse power supply, the pressure waves diffuse in the form of pulses. When the pressure waves quickly and indirectly contact the cracks of the runner blades 40, high-frequency vibrations can be generated at the cracks, thereby vibrating and cleaning the impurities inside the cracks.

[0037] like Figure 3 and Figure 7-Figure 8 As shown, the vibration assembly 10 includes a metal vibration plate 101 fixedly mounted on the crossbeam 82 , and a connecting rod 102 is fixedly mounted on the side wall of the lower end of the metal vibration plate 101 .

[0038] like Figure 7-Figure 8As shown, the blowing assembly 20 includes a pair of L-shaped fixing rods 201 fixedly mounted on the crossbeam 82, and an air chamber 202 is fixedly mounted on the lower ends of the two L-shaped fixing rods 201. A one-way air inlet valve 203 is fixedly mounted on the top surface of the air chamber 202, and a diaphragm 205 is fixedly mounted in the inner cavity of the air chamber 202. A through hole 204 is provided on the side wall of the air chamber 202 facing the metal vibrator 101, and the metal vibrator 101 and the diaphragm 205 are fixedly connected by a connecting rod 102, and the connecting rod 102 is arranged in the inner cavity of the through hole 204.

[0039] Specifically, in the process of processing the crack, as the robot arm 1 moves, the crack path is scanned and analyzed by a scanning probe (not shown in the figure) integrated on the output end of the robot arm 1 to plan the cleaning path for the crack; first, a high-frequency pulse power supply is applied to the two electrode rods 9, so that the arc between the two electrode rods 9 can change periodically in a "generation-extinguishing-generation-extinguishing" manner. During the generation of the arc, the surrounding air will rapidly expand due to heat. When the arc is extinguished, the surrounding air will rapidly cool down under the action of convection, thus forming a periodic change of "expansion-cooling contraction-expansion-cooling contraction", and the pressure wave generated by the periodic change of "expansion-cooling contraction-expansion-cooling contraction" is diffused in the form of a pulse. When the pressure wave quickly contacts the crack of the runner blade 40 indirectly, it will act on the crack of the runner blade 40, generating high-frequency vibration at the crack, and vibrating and cleaning the impurities inside the crack.

[0040] like Figure 10 As shown, since the pressure wave diffuses in a "spherical" manner, during the diffusion process, a part of the pressure wave will act on the metal vibrator 101, causing the metal vibrator 101 to generate high-frequency vibration. During the high-frequency vibration process, the metal vibrator 101 will drive the diaphragm 205 to perform high-frequency periodic reciprocating motion through the connecting rod 102. During the high-frequency periodic reciprocating motion of the diaphragm 205, the outside air will be continuously sucked into the air chamber 202 through the one-way air intake valve 203, and then pressure is applied to the air through the diaphragm 205 to eject the air from the outlet of the air chamber 202. Since the diaphragm 205 performs high-frequency periodic reciprocating motion, a high-frequency pulse airflow will be generated, which is used to further clean the impurities remaining inside the crack after vibration cleaning, ensure the cleaning effect, and facilitate subsequent crack processing.

[0041] For impurities in cracks, the existing technology generally uses manual, airflow, water flow and grinding to clean them. Manual cleaning not only requires reliance on professional tools, but is also labor-intensive and prone to omissions. In the process of cleaning impurities, airflow and water flow will attenuate as the depth of the crack increases, and the problem of insufficient flushing force may occur. Grinding cleaning can generally only clean shallow cracks, but cannot reach deep cracks, and there is also a risk of crack expansion. The present application can not only use pressure waves to achieve high-frequency vibration cleaning, but also use high-frequency vibration to generate high-frequency pulse airflow, and use vibration and pulse airflow to achieve double cleaning. Compared with traditional continuous airflow injection, the cleaning ability is stronger.

[0042] Since there may be some magnetic impurities in the cracks, they will affect the regulation of the gradient magnetic field, and then affect the deflection direction of the induced arc, and ultimately affect the treatment effect of the induced arc on the branch cracks. The above cleaning operation can avoid the problem of magnetic impurities affecting the deflection direction of the induced arc, thereby ensuring the treatment effect on the branch cracks.

[0043] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0044] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A welding surface treatment device for repairing cracked surfaces of runner blades, comprising a mechanical arm (1) for adjusting the crack cleaning distance and angle, wherein an output end of the mechanical arm (1) is provided with a mounting plate (2) for mounting parts, characterized in that: A triangular plate (3) is fixedly provided on the bottom surface of the mounting plate (2), a main electrode (4) for generating an arc is fixedly provided on the triangular plate (3), an auxiliary electrode 1 (5) and an auxiliary electrode 2 (6) are also slidably provided on the triangular plate (3), a positioning assembly (30) is fixedly provided on the top surface of the triangular plate (3), a runner blade (40) is placed below the main electrode (4), the auxiliary electrode 1 (5) and the auxiliary electrode 2 (6), and a gradient magnetic field generator for generating a gradient magnetic field is fixedly provided on the bottom surface of the triangular plate (3). The main electrode (4), the auxiliary electrode 1 (5) and the auxiliary electrode 2 (6) are all arranged in the inner circle of the gradient magnetic field generator (7); a mounting frame (8) is fixedly arranged on the bottom surface of the triangular plate (3); a pair of electrode rods (9) are fixedly arranged on the mounting frame (8); a vibration component (10) for generating high-frequency vibration and an air blowing component (20) for cleaning cracks are also fixedly arranged on the mounting frame (8), and the vibration component (10) and the air blowing component (20) are fixedly connected.

2. A weld surface treatment device for repairing a cracked surface of a runner blade according to claim 1, characterized in that: The main electrode (4), the auxiliary electrode 1 (5) and the auxiliary electrode 2 (6) are arranged in the shape of an isosceles triangle, the main electrode (4) is located in front of the auxiliary electrode 1 (5) and the auxiliary electrode 2 (6), and the main electrode (4), the auxiliary electrode 1 (5) and the auxiliary electrode 2 (6) are arranged at the same horizontal height.

3. A welding surface treatment device for repairing a cracked surface of a runner blade according to claim 2, characterized in that: The triangular plate (3) includes a plurality of fixed columns (33) fixedly mounted on the bottom surface of the mounting plate (2), a plate body (31) being fixedly mounted on the bottom surface of the plurality of fixed columns (33), two symmetrical slide grooves (32) being symmetrically provided on the plate body (31), and auxiliary electrode 1 (5) and auxiliary electrode 2 (6) being slidably mounted in the inner cavities of the two slide grooves (32) respectively.

4. A weld surface treatment device for repairing a cracked surface of a runner blade according to claim 3, characterized in that: The positioning assembly (30) includes a fixing seat (301) fixedly mounted on the top surface of the plate body (31), electric push rods (302) are symmetrically fixedly mounted on the outer walls of both sides of the fixing seat (301), and connecting ears (303) are fixedly mounted on the top surfaces of the auxiliary electrode 1 (5) and the auxiliary electrode 2 (6), respectively, and the output end of the electric push rod (302) is rotatably connected to the connecting ear (303).

5. The weld surface treatment device for repairing cracked surfaces of runner blades according to claim 3, characterized in that: The gradient magnetic field generator (7) comprises a bracket (71) fixedly mounted on the bottom surface of the plate body (31), and a plurality of gradient coils (72) are fixedly mounted on the bracket (71).

6. A weld surface treatment device for repairing a cracked surface of a runner blade according to claim 5, characterized in that: The gradient magnetic field generated by the gradient coil (72) decreases gradually in gradient toward the surrounding areas with the main electrode (4) as the center.

7. The weld surface treatment device for repairing a cracked surface of a runner blade according to claim 1, characterized in that: The mounting frame (8) comprises a pair of mounting plates (81) symmetrically fixedly mounted on the bottom surface of the mounting plate (2), a crossbeam (82) being fixedly mounted on the side walls of the two mounting plates (81), and an electrode rod (9) being fixedly mounted on the lower ends of the two mounting plates (81).

8. The weld surface treatment device for repairing a cracked surface of a runner blade according to claim 1, characterized in that: A high-frequency pulse power supply is supplied to the two electrode rods (9), generating pressure waves around the tips of the two electrode rods (9), and the pressure waves diffuse in a "spherical" manner.

9. The weld surface treatment device for repairing a cracked surface of a runner blade according to claim 7, characterized in that: The vibration assembly (10) comprises a metal vibration plate (101) fixedly mounted on the crossbeam (82), and a connecting rod (102) is fixedly mounted on the side wall of the lower end of the metal vibration plate (101).

10. A welding surface treatment device for repairing a cracked surface of a runner blade according to claim 9, characterized in that: The blowing assembly (20) includes a pair of L-shaped fixing rods (201) fixedly mounted on the crossbeam (82), an air chamber (202) being fixedly mounted on the lower ends of the two L-shaped fixing rods (201), a one-way air inlet valve (203) being fixedly mounted on the top surface of the air chamber (202), a diaphragm (205) being fixedly mounted in the inner cavity of the air chamber (202), a through hole (204) being provided on the side wall of the air chamber (202) facing the metal vibrating plate (101), the metal vibrating plate (101) and the diaphragm (205) being fixedly connected via a connecting rod (102), and the connecting rod (102) being arranged in the inner cavity of the through hole (204).

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