A welding surface processing device for repairing a crack surface of a runner blade

Abstract

The application discloses a welding surface processing 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, the output end of the mechanical arm is provided with a mounting disc, a triangular plate is fixedly arranged on the bottom surface of the mounting disc, a main electrode for generating an electric arc is fixedly arranged on the triangular plate, auxiliary electrodes one and two are also slidably arranged on the triangular plate, a position adjusting assembly is fixedly arranged on the top surface of the triangular plate, a gradient magnetic field generator for generating a gradient magnetic field is fixedly arranged on the bottom surface of the triangular plate, the main electrode, the auxiliary electrode one and the auxiliary electrode two are all arranged in the inner ring of the gradient magnetic field generator, a mounting frame is fixedly arranged on the bottom surface of the triangular plate, a pair of electrode rods are fixedly arranged on the mounting frame, and a vibration assembly and a gas blowing assembly are also respectively fixedly arranged on the mounting frame. The device can process branch cracks by using induced electric arcs while processing main cracks by using main electric arcs, so that the processing efficiency is higher and the processing effect is better.

Description

Technical Field

[0001] This invention belongs to the field of metal cutting technology, specifically, it relates to a welding surface treatment device for repairing cracked surfaces of rotary blades. Background Technology

[0002] Runner blades are the core components of the power mechanism of steam turbines and water turbines. During use, 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 at the welded edges and geometric abrupt changes of the runner blades. In order to prevent further damage to the runner blades, the cracks are cleaned by mechanical grinding, electric arc cutting and other methods. After the cracks are cleaned, the weld surface is treated and welded.

[0003] The aforementioned crack removal generally employs electric arc cutting of metal, which essentially melts the metal at the crack site using an electric arc to ensure crack elimination. Although electric arc cutting of metal is widely used in the field of metal repair, it still has many drawbacks, specifically as follows: Existing crack treatment methods melt the main crack using a single main arc, treating the main crack first and then the branch cracks, making it impossible to treat both the main crack and the branch cracks simultaneously, resulting in low efficiency; In addition, when the main crack is treated first and then the branch crack is treated, at least two melting processes occur at the intersection of the main crack and the branch crack, which can easily cause additional damage to the substrate.

[0004] Therefore, we propose a welding surface treatment device for repairing cracked surfaces of turbine blades to solve the problems mentioned above. Summary of the Invention

[0005] In view of the problems of existing technology, which cannot treat main cracks and branch cracks at the same time, and when the branch cracks are treated after the main cracks are treated, the intersection of the main cracks and branch cracks will undergo at least two melting processes, which can easily cause additional damage to the substrate, the purpose of this invention is to provide a welding surface treatment device for repairing cracks on turbine blades.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows: a welding surface treatment device for repairing cracks in a rotary blade, comprising a robotic arm for adjusting the crack cleaning distance and angle, an output end of the robotic arm having a mounting plate for mounting components, a triangular plate fixedly mounted on the bottom surface of the mounting plate, a main electrode for generating an electric arc fixedly mounted on the triangular plate, an auxiliary electrode one and an auxiliary electrode two slidably mounted on the triangular plate, an adjustment component fixedly mounted on the top surface of the triangular plate, a rotary blade placed below the main electrode, auxiliary electrode one and auxiliary electrode two, a gradient magnetic field generator for generating a gradient magnetic field fixedly mounted on the bottom surface of the triangular plate, the main electrode, auxiliary electrode one and auxiliary electrode two all being arranged in the inner ring of the gradient magnetic field generator, a mounting frame fixedly mounted on the bottom surface of the triangular plate, a pair of electrode rods fixedly mounted on the mounting frame, a vibration component for generating high-frequency vibration and an air blowing component for cleaning cracks fixedly mounted on the mounting frame, and the vibration component and the air blowing component being fixedly connected.

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

[0008] Furthermore, the triangular plate includes several fixed posts 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 posts. Two sliding grooves are symmetrically opened on the plate body, and auxiliary electrode one and auxiliary electrode two are respectively slidably installed through the inner cavity of the two sliding grooves.

[0009] Furthermore, the positioning assembly includes a fixed base fixedly installed on the top surface of the plate, electric actuators symmetrically fixedly installed on the outer walls of both sides of the fixed base, and connecting ears fixedly installed on the top surfaces of auxiliary electrode one and auxiliary electrode two, and the output end of the electric actuator is rotatably connected to the connecting ear.

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

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

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

[0013] Furthermore, a high-frequency pulsed power supply is applied to the two electrode rods to generate pressure waves around the tips of the two electrode rods, which spread in a "spherical" manner.

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

[0015] Furthermore, the air blowing assembly includes a pair of L-shaped fixing rods fixedly installed on the crossbeam. The lower ends of the two L-shaped fixing rods are jointly fixedly installed with an air chamber. A one-way air inlet valve is fixedly installed on the top surface of the air chamber. A diaphragm is fixedly installed 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 set in the inner cavity of the through hole.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention can treat the main crack using the main electric arc, and at the same time treat the branch crack using the induced electric arc, resulting in higher processing efficiency and better effect.

[0018] 2. In the process of treating the main crack and the branch crack, the main electric arc and the induced electric arc are directly separated at the intersection of the main crack and the branch crack, so that the intersection will not be repeatedly melted, thus reducing the probability of additional damage to the substrate caused by repeated melting.

[0019] 3. The induced electric arc and gradient magnetic field in this invention are dynamically adjusted in real time, and can automatically adjust the generation and extinguishing of the induced electric arc according to the crack morphology. This not only saves energy, but also has strong adaptability and flexibility of use.

[0020] 4. When the branch cracks are not treated, the present invention can use a magnetic field to make the main electric arc maintain its arc trajectory more stably, thereby accurately cleaning the main crack.

[0021] 5. This invention can utilize a magnetic field to make the main electric arc maintain its arc trajectory more stably, thereby accurately cleaning the main crack.

[0022] 6. After cleaning the crack, the present invention can use a magnetic field to make the main electric arc maintain its arc trajectory more stably, thereby accurately cleaning the main crack. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram showing the layout of the main electrode, auxiliary electrode one, auxiliary electrode two, and gradient magnetic field generator of the present invention.

[0025] Figure 3 This is a three-dimensional structural diagram of the gradient magnetic field generator of the present invention;

[0026] Figure 4 This is a three-dimensional structural diagram of the triangular plate of the present invention;

[0027] Figure 5 for Figure 4 Enlarged view of point A;

[0028] Figure 6 This is a schematic diagram of the main electrode, auxiliary electrode one, and auxiliary electrode two of the present invention for treating main cracks and branch cracks;

[0029] Figure 7 This is a cross-sectional schematic diagram of the vibration component and the air blowing component of the present invention;

[0030] Figure 8 for Figure 7 Enlarged view of point B;

[0031] Figure 9 This is a schematic diagram of the gradient magnetic field distribution of the present invention;

[0032] Figure 10 This is a schematic diagram of the pressure wave diffusion path of the present invention;

[0033] Figure 11 This is a three-dimensional structural diagram of the positioning component of the present invention.

[0034] In the diagram: 1. Robotic arm; 2. Mounting plate; 3. Triangular plate; 31. Plate body; 32. Slide groove; 33. Fixed column; 4. Main electrode; 5. Electrode one; 6. Auxiliary electrode two; 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. Air blowing assembly; 201. L-shaped fixed rod; 202. Air chamber; 203. One-way air inlet valve; 204. Through hole; 205. Diaphragm; 30. Adjustment assembly; 301. Fixed base; 302. Electric actuator; 303. Connecting lug; 40. Rotary wheel blade. Detailed Implementation

[0035] The present invention will be further described below with reference to specific embodiments.

[0036] To address the limitations of existing technologies in simultaneously treating main cracks and branch cracks, and the fact that when treating the main crack followed by the branch crack results in at least two melting processes at the intersection of the main and branch cracks, potentially causing additional damage to the substrate, such as... Figure 1 - Figure 11 As shown:

[0037] like Figure 1As shown, a weld surface treatment device for repairing cracks in turbine blades includes a robotic arm 1 for adjusting the crack cleaning distance and angle. The output end of the robotic arm 1 is equipped with a mounting plate 2 for mounting components. The output end of the robotic arm 1 integrates a scanning probe (not shown) for determining the crack direction, thus facilitating the determination of the crack cleaning path. Figures 2-3 As shown, a triangular plate 3 is fixedly mounted on the bottom surface of the mounting plate 2. A main electrode 4 for generating an electric arc is fixedly mounted on the triangular plate 3. An auxiliary electrode 5 and an auxiliary electrode 6 are also slidably mounted on the triangular plate 3. Figures 4-5 As shown, an adjustment component 30 is fixedly installed on the top surface of the triangle 3, such as... Figure 6 As shown, a rotating blade 40 is placed below the main electrode 4, auxiliary electrode 1 5, and auxiliary electrode 2 6, as... Figures 2-3 As shown, a gradient magnetic field generator 7 for generating a gradient magnetic field is fixedly installed on the bottom surface of the triangular plate 3. The main electrode 4, auxiliary electrode 1 5 and auxiliary electrode 2 6 are all arranged in the inner circle of the gradient magnetic field generator 7. A mounting frame 8 is fixedly installed on the bottom surface of the triangular plate 3. A pair of electrode rods 9 are fixedly installed 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 installed on the mounting frame 8. The vibration component 10 and the air blowing component 20 are fixedly connected.

[0038] Specifically, during the crack treatment process, a high-frequency pulse power supply is applied to the two electrode rods 9, so that the electric arc between the two electrode rods 9 can form a periodically changing pressure wave, which acts on the crack of the rotor blade 40 to vibrate and clean the impurities inside the crack; such as Figure 10 As shown, since the pressure wave spreads in a "spherical" manner, during the diffusion process, a portion 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, the vibration component 10 will drive the air blowing component 20 to generate high-frequency pulse airflow, which is used to further clean the impurities remaining inside the crack after vibration cleaning, ensuring the cleaning effect and facilitating subsequent crack treatment.

[0039] When only the main crack exists and there are no branch cracks, the main electrode 4 is energized to generate the main electric arc. Then, by controlling the current magnitude, 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, auxiliary electrode 1 5 and auxiliary electrode 2 6. Under the action of the magnetic field, the main electric arc can maintain its arc trajectory more stably, thereby accurately cleaning the crack.

[0040] like Figures 2-3 and Figure 6As shown, the main electrode 4, auxiliary electrode 1 5 and auxiliary electrode 2 6 are arranged in an isosceles triangle shape, with the main electrode 4 in front of the auxiliary electrode 1 5 and auxiliary electrode 2 6, and the main electrode 4, auxiliary electrode 1 5 and auxiliary electrode 2 6 are set at the same horizontal height.

[0041] The main electrode 4, auxiliary electrode 1 5, and auxiliary electrode 2 6 are distributed in the manner described above, which enables the auxiliary electrode 1 5 and auxiliary electrode 2 6 to accurately capture the induced arc separated from the main electrode 4. In addition, this arrangement can ensure the uniformity and symmetry of the induced arc on both sides, which is conducive to better control of the arc shape and energy distribution, and thus to better achieve the treatment effect on cracks.

[0042] like Figures 3-4 As shown, the triangular plate 3 includes several fixed posts 33 fixedly installed on the bottom surface of the mounting plate 2. A plate body 31 is fixedly installed on the bottom surface of the several fixed posts 33. Two sliding grooves 32 are symmetrically opened on the plate body 31. Auxiliary electrode 1 5 and auxiliary electrode 2 6 are respectively slidably installed in the inner cavity of the two sliding grooves 32.

[0043] like Figure 5 As shown, the positioning assembly 30 includes a fixed base 301 fixedly installed on the top surface of the plate 31. Electric actuators 302 are symmetrically fixedly installed on the outer walls of both sides of the fixed base 301. Connecting ears 303 are fixedly installed on the top surfaces of the auxiliary electrode 5 and the auxiliary electrode 6, and the output end of the electric actuator 302 is rotatably connected to the connecting ear 303.

[0044] like Figure 3 As shown, the gradient magnetic field generator 7 includes a bracket 71 fixedly installed on the bottom surface of the plate 31. Several gradient coils 72 are fixedly installed 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 area.

[0045] Specifically, when branch cracks are encountered during the cleaning of the main crack, auxiliary electrode 5 and auxiliary electrode 6 are energized, such as... Figure 9As shown, by controlling parameters such as the magnitude, direction, and timing of the current within the gradient magnetic field generator 7, a magnetic field with a decreasing gradient centered on the main electrode 4 is generated. 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 experiences a transverse Lorentz force within the gradient magnetic field. Under the excitation of the gradient magnetic field and the current, the main arc acts as an energy carrier, generating induced arcs on the auxiliary electrode 1 5 and auxiliary electrode 2 6 through energy coupling. Simultaneously, 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. The auxiliary electrode 6 slides on the groove 32 towards the branch crack, while the gradient magnetic field is dynamically changed. Under the action of the Lorentz force, the induced arc on the auxiliary electrode 5 or the auxiliary electrode 6 moves towards the branch crack, thus enabling the induced arc to treat the branch crack. Since the distance between the branch crack and the main crack is between a few millimeters and tens of millimeters, the distance is relatively close. By cooperating with the electric push rod 302 and the connecting ear 303, the auxiliary electrode 5 or the auxiliary electrode 6 is pushed to slide slightly on the groove 32 towards the branch crack, so that the induced arc can be used to treat the branch crack.

[0046] Traditional crack treatment methods involve treating the main crack first, followed by the branch cracks. However, this invention, through the above-mentioned setup, allows for the generation of induced arcs on auxiliary electrodes 5 and 6 when encountering branch cracks while the main arc on the main electrode 4 is used to treat the main crack. This enables the simultaneous treatment of branch cracks using the induced arcs, resulting in higher efficiency and better performance. Furthermore, this treatment method ensures that the main arc and the induced arc separate directly at the intersection of the main crack and the branch crack, preventing repeated melting at the intersection and reducing the probability of additional damage to the substrate caused by repeated melting.

[0047] When the main crack is being treated and no branch cracks are encountered, the auxiliary electrodes 5 and 6 are de-energized. By controlling the current magnitude, current direction, and power sequence parameters within the gradient magnetic field generator 7, the generator generates a magnetic field parallel to the main electrode 4, auxiliary electrodes 5 and 6. This not only saves energy but also utilizes the magnetic field to more stably maintain the arc trajectory of the main electric arc, thereby precisely cleaning the main crack. This setting is dynamically adjusted in real time, automatically adjusting the generation and extinguishing of the induced electric arc according to the crack morphology, exhibiting strong adaptability and flexibility in use.

[0048] To address the problem of incomplete removal of impurities from cracks affecting crack treatment effectiveness, such as... Figure 3 and Figure 7 - Figure 10 As shown:

[0049] 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 plate 2. A crossbeam 82 is fixedly mounted on the side wall of the two mounting plates 81. Electrode rods 9 are fixedly mounted on the lower ends of the two mounting plates 81 respectively. A high-frequency pulse power supply is applied to the two electrode rods 9, generating pressure waves around the tips of the two electrode rods 9. The pressure waves spread in a "spherical" manner. Since the electrode rods 9 are supplied with a high-frequency pulse power supply, the pressure waves spread in the form of pulses. When the pressure waves quickly and indirectly contact the cracks of the rotor blades 40, they can generate high-frequency vibrations at the cracks, thereby vibrating and cleaning the impurities inside the cracks.

[0050] like Figure 3 and Figures 7-8 As shown, the vibration assembly 10 includes a metal vibrator 101 fixedly mounted on a crossbeam 82, and a connecting rod 102 fixedly mounted on the side wall at the lower end of the metal vibrator 101.

[0051] like Figures 7-8 As shown, the air blowing assembly 20 includes a pair of L-shaped fixing rods 201 fixedly installed on the crossbeam 82. The lower ends of the two L-shaped fixing rods 201 are fixedly installed with an air chamber 202. A one-way air inlet valve 203 is fixedly installed on the top surface of the air chamber 202. A diaphragm 205 is fixedly installed in the inner cavity of the air chamber 202. A through hole 204 is opened on the side wall of the air chamber 202 facing the metal vibrator 101. The metal vibrator 101 and the diaphragm 205 are fixedly connected by a connecting rod 102, and the connecting rod 102 is located in the inner cavity of the through hole 204.

[0052] Specifically, during the crack treatment process, as the robotic arm 1 moves, the crack path is scanned and analyzed by the scanning probe (not shown in the figure) integrated on the output end of the robotic arm 1 to plan the crack cleaning path. First, a high-frequency pulse power supply is applied to the two electrode rods 9, so that the electric arc between the two electrode rods 9 can change periodically in the manner of "generation-extinguishing-generation-extinguishing". During the generation of the electric arc, the surrounding air will be rapidly heated and expanded. When the electric arc is extinguished, the surrounding air will be rapidly cooled under the action of convection. In this way, a periodic change of "expansion-cooling contraction-expansion-cooling contraction" can be formed. The pressure wave generated by the periodic change of "expansion-cooling contraction-expansion-cooling contraction" is diffused in the form of pulses. When the pressure wave quickly and indirectly contacts the crack of the rotor blade 40, it will act on the crack of the rotor blade 40 and generate high-frequency vibration at the crack, which will vibrate and clean the impurities inside the crack.

[0053] like Figure 10As shown, since the pressure wave diffuses in a "spherical" manner, during the diffusion process, a portion of the pressure wave acts on the metal diaphragm 101, causing the metal diaphragm 101 to vibrate at high frequency. During the high-frequency vibration, the metal diaphragm 101 drives the diaphragm 205 to perform high-frequency periodic reciprocating motion via the connecting rod 102. During the high-frequency periodic reciprocating motion of the diaphragm 205, it continuously draws outside air into the air chamber 202 through the one-way air intake valve 203, and then applies pressure to the air through the diaphragm 205, ejecting the air from the outlet of the air chamber 202. Because the diaphragm 205 performs high-frequency periodic reciprocating motion, it generates a high-frequency pulse airflow, which is used to further clean the impurities remaining inside the crack after vibration cleaning, ensuring the cleaning effect and facilitating subsequent crack treatment.

[0054] Existing technologies typically clean impurities in cracks using methods such as manual labor, airflow, water flow, and grinding. Manual cleaning requires specialized tools, is labor-intensive, and prone to omissions. Airflow and water flow weaken as crack depth increases, resulting in insufficient scouring power. Grinding is generally only effective for shallow cracks, failing to reach deep cracks and risking crack expansion. This application, however, utilizes pressure waves for high-frequency vibration cleaning while simultaneously generating high-frequency pulsed airflow. The combination of vibration and pulsed airflow achieves dual cleaning, resulting in significantly stronger cleaning capabilities compared to traditional continuous airflow jets.

[0055] Since some magnetic impurities may be present in the crack, they can affect the control of the gradient magnetic field, which in turn affects the deflection direction of the induced arc, and ultimately affects the treatment effect of the induced arc on the branch crack. However, by performing the above cleaning operation, the problem of magnetic impurities affecting the deflection direction of the induced arc can be avoided, thus ensuring the treatment effect on the branch crack.

[0056] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0057] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding surface treatment device for repairing cracked surfaces of turbine blades, comprising a robotic arm (1) for adjusting the crack cleaning distance and angle, wherein the output end of the robotic arm (1) is provided with a mounting plate (2) for mounting components, characterized in that: A triangular plate (3) is fixedly mounted on the bottom surface of the mounting plate (2). A main electrode (4) for generating an electric arc is fixedly mounted on the triangular plate (3). An auxiliary electrode one (5) and an auxiliary electrode two (6) are also slidably mounted on the triangular plate (3). An adjustment component (30) is fixedly mounted on the top surface of the triangular plate (3). A rotating wheel blade (40) is placed below the main electrode (4), auxiliary electrode one (5), and auxiliary electrode two (6). A gradient magnetic field generator for generating a gradient magnetic field is fixedly mounted on the bottom surface of the triangular plate (3). The generator (7), main electrode (4), auxiliary electrode one (5) and auxiliary electrode two (6) are all set in the inner ring of the gradient magnetic field generator (7). A mounting bracket (8) is fixedly set on the bottom surface of the triangular plate (3). A pair of electrode rods (9) are fixedly set on the mounting bracket (8). A vibration component (10) for generating high frequency vibration and an air blowing component (20) for cleaning cracks are also fixedly set on the mounting bracket (8). The vibration component (10) and the air blowing component (20) are fixedly connected. The triangular plate (3) includes several fixed posts (33) fixedly installed on the bottom surface of the mounting plate (2), and a plate body (31) is fixedly installed on the bottom surface of the several fixed posts (33). The gradient magnetic field generator (7) includes a bracket (71) fixedly installed on the bottom surface of the plate (31), and a number of gradient coils (72) are fixedly installed on the bracket (71). The gradient magnetic field generated by the gradient coil (72) decreases gradually from the main electrode (4) outwards. The mounting frame (8) includes a pair of mounting plates (81) symmetrically fixedly mounted on the bottom surface of the mounting plate (2). A crossbeam (82) is fixedly mounted on the side wall of the two mounting plates (81), and an electrode rod (9) is fixedly mounted on the lower end of the two mounting plates (81). A high-frequency pulse power supply is applied to the two electrode rods (9), generating pressure waves around the tips of the two electrode rods (9), which spread in a "spherical" manner. The vibration assembly (10) includes a metal vibrating plate (101) fixedly installed on a crossbeam (82), and a connecting rod (102) is fixedly installed on the side wall at the lower end of the metal vibrating plate (101). The air blowing assembly (20) includes a pair of L-shaped fixing rods (201) fixedly installed on the crossbeam (82). The lower ends of the two L-shaped fixing rods (201) are fixedly installed with an air chamber (202). A one-way air inlet valve (203) is fixedly installed on the top surface of the air chamber (202). A diaphragm (205) is fixedly installed in the inner cavity of the air chamber (202). A through hole (204) is opened on the side wall of the air chamber (202) facing the metal vibrator (101). The metal vibrator (101) and the diaphragm (205) are fixedly connected by a connecting rod (102), and the connecting rod (102) is set in the inner cavity of the through hole (204).

2. The welding surface treatment device for repairing cracked surfaces of turbine blades according to claim 1, characterized in that, The main electrode (4), auxiliary electrode one (5) and auxiliary electrode two (6) are arranged in an isosceles triangle shape. The main electrode (4) is in front of the auxiliary electrode one (5) and auxiliary electrode two (6), and the main electrode (4), auxiliary electrode one (5) and auxiliary electrode two (6) are arranged at the same horizontal height.

3. The welding surface treatment device for repairing cracked surfaces of turbine blades according to claim 2, characterized in that, Two sliding grooves (32) are symmetrically opened on the plate (31), and auxiliary electrode one (5) and auxiliary electrode two (6) are respectively slidably installed in the inner cavity of the two sliding grooves (32).

4. The welding surface treatment device for repairing cracked surfaces of turbine blades according to claim 3, characterized in that, The adjustment assembly (30) includes a fixed seat (301) fixedly installed on the top surface of the plate (31). Electric actuators (302) are symmetrically fixedly installed on the outer walls of both sides of the fixed seat (301). Connecting ears (303) are fixedly installed on the top surfaces of the auxiliary electrode one (5) and the auxiliary electrode two (6), and the output end of the electric actuator (302) is rotatably connected to the connecting ear (303).

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