A welding device for moving blades of steam turbine

Abstract

The present invention discloses a moving blade welding device for a steam turbine, which relates to the technical field of steam turbines, including a support plate 1, an impeller clamping mechanism and a blade clamping mechanism. The impeller clamping mechanism is arranged at the upper rear of the support plate 1 and includes a positioning ring. The right end of the positioning ring is cut with an annular positioning surface. The circular array on the positioning surface has positioning columns and is used to achieve circumferential positioning of the impeller. The inner side of the positioning ring is evenly provided with 90° transfer clamping cylinders and is used to achieve axial positioning of the impeller. The blade clamping mechanism is arranged at the upper front of the support plate 1 and includes a positioning block. The top contour surface of the positioning block can be adapted to fit the blade. The positioning block is a hollow structure and suction holes are evenly provided on the top thereof. A vacuum generator is used to form a negative pressure on the inner side of the suction hole, thereby achieving the positioning of the blade. The present invention realizes the positioning and indexing of the impeller and the positioning and feeding of the blade through the impeller clamping mechanism and the blade clamping mechanism, respectively, so that the welding effect between the impeller and the blade is better.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a moving blade welding device for steam turbines. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated airflow and then is sprayed onto the blades, causing the rotor equipped with the blade row to rotate and simultaneously perform work externally, converting the thermal energy of the steam into mechanical work. It is a rotary machine that is the most widely used prime mover in modern thermal power plants. The outer edge of the steam turbine impeller and the blades are usually connected by welding. In the prior art, in order to ensure the reliability of the welding position between the outer edge of the steam turbine impeller and the blades, one person usually welds and the other person holds the fixed blades. This method requires at least two workers, which consumes more manpower invisibly. At the same time, the final welding effect is difficult to guarantee. Summary of the invention

[0003] The object of the present invention is to provide a moving blade welding device for a steam turbine to solve the above-mentioned defects caused by the prior art.

[0004] A moving blade welding device for a steam turbine comprises a support plate 1, an impeller clamping mechanism and a blade clamping mechanism, wherein the support plate 1 is arranged in a horizontal front-to-back direction, wherein:

[0005] The impeller clamping mechanism is arranged at the upper rear of the support plate 1 and includes a vertically arranged H-shaped support frame 1, the bottom end of the support frame 1 is welded with a connecting plate 1 by means of a rib plate 1, and the connecting plate 1 is installed on the upper end surface of the support plate 1, the top end of the support frame 1 is welded with a connecting plate 2 by means of a rib plate 2, the upper end surface of the connecting plate 2 is horizontally installed with a connecting plate 3, the upper end surface of the connecting plate 3 is centrally installed with an inverted T-shaped connecting plate 4, the connecting plate 4 is centrally installed with a rotating shaft through a bearing, the right end portion of the rotating shaft is coaxially connected to a circular mounting plate through a mounting seat, and the right end surface of the mounting plate is coaxially connected to the The shaft is provided with a positioning ring, the right end face of the positioning ring is cut with an annular positioning surface, the positioning surface is provided with a circular array of positioning columns, the mounting plate is provided with a 90° angle clamping cylinder in a circular array on the inner side of the positioning ring, a clamping plate is provided on the pressure arm of the angle clamping cylinder, a right-angled triangle support frame 2 is installed in the middle of the left side of the support frame 1, a support plate 2 is horizontally installed on the top of the support frame 2, a driving motor is installed on the upper end face of the support plate 2, a pulley 1 is keyed to the output shaft of the driving motor, a pulley 2 is keyed to the left end of the rotating shaft, and the pulley 1 and the pulley 2 are connected by a belt;

[0006] The blade clamping mechanism is arranged on the front upper part of the support plate one and includes a vertically arranged rectangular support tube, the bottom end of the support tube is welded with a connecting plate five by means of rib plate three, and the connecting plate five is installed on the upper end surface of the support plate one, and a horizontal backward telescopic cylinder is installed on the upper part of the support tube, the piston rod of the telescopic cylinder passes through the support tube and is connected to a vertical connecting plate six, and a positioning block is centrally installed on the rear side of the connecting plate six, and the top contour surface of the positioning block can be adapted to fit the blade, the positioning block is a hollow structure and suction holes are evenly distributed on its top, a vacuum generator is provided on one side of the support frame two, and the vacuum generator is connected to the positioning block through an air pipe, guide columns are parallel and symmetrically arranged on the upper and lower parts of the telescopic cylinder, the rear extension end of the guide column passes through the support tube and is connected to the connecting plate six, a guide sleeve is slidably provided on the guide column and fixed to the support tube.

[0007] Preferably, a wire groove is processed on the outer circumference of the positioning ring, and the wire groove is located at the 12 o'clock position on the positioning ring.

[0008] Preferably, a horizontal support plate three is provided directly below the support plate one, and vertical upward lifting hydraulic cylinders are evenly installed on the upper end surface of the support plate three, and the piston rods of the lifting hydraulic cylinders are connected to the lower end surface of the support plate one.

[0009] Preferably, the lower end surface of the support plate three is evenly mounted with Fuma wheels.

[0010] Preferably, an electrical cabinet is placed on the upper end surface of the support plate 1, and a controller is provided in the electrical cabinet. The controller is respectively connected to the driving motor and the telescopic cylinder, and the controller is also externally connected to a foot switch.

[0011] The advantages of the present invention are as follows: first, the positioning surface on the positioning ring is used as the reference surface of the impeller, and the impeller is mounted on the positioning column on the positioning ring. Then, the piston rod of the 90° transfer clamping cylinder is contracted, and the impeller is pressed and fixed on the positioning ring by the clamping plate. Then, the rear side surface of the connecting plate 6 is used as the reference surface of the blade, and the blade is placed on the top contour surface of the positioning block. Then, a negative pressure environment is formed on the inner side of the suction hole through the vacuum generator, and the blade is pressed and fixed on the positioning block by the internal and external pressure difference. Then, the activity of the telescopic cylinder is used to tighten the impeller. The extension of the plug rod makes the welding end of the blade contact with the welding groove on the impeller 38, and then the blade and the impeller are welded manually. Then, the vacuum generator stops working. At the same time, the positioning block returns to the starting position by shortening the piston rod of the telescopic cylinder. Then, the next blade is placed according to the above method. At the same time, the driving motor drives the impeller to rotate to the next welding groove... and so on, completing the welding of all the blades on the impeller. Finally, the welded impeller assembly is released by extending the piston rod of the 90° transfer clamping cylinder. The present invention realizes the positioning and indexing of the impeller and the positioning and feeding of the blades through the impeller clamping mechanism and the blade clamping mechanism, respectively, so that the welding effect between the impeller and the blades is better. In summary, the moving blade welding device for steam turbines in the present invention has the characteristics of reasonable structure, simple structure, easy use and good welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the overall front view of the present invention.

[0013] Figure 2 It is a schematic structural diagram of the overall front view of the present invention.

[0014] Figure 3 It is a schematic structural diagram of the overall side view of the present invention.

[0015] Figure 4 This is a schematic diagram of the impeller clamping mechanism structure.

[0016] Figure 5 It is a schematic diagram of the blade clamping mechanism structure.

[0017] Figure 6 Schematic diagram of the impeller and blade structure.

[0018] in:

[0019] 1-Support plate 1; 2-Support frame 1; 3-Rib plate 1; 4-Connecting plate 1; 5-Rib plate 2; 6-Connecting plate 2; 7-Connecting plate 3; 8-Connecting plate 4; 9-Rotation axis; 10-Mounting seat; 11-Mounting plate; 12-Location ring; 121-Wire groove; 13-Location surface; 14-Location column; 15-90° angle clamping cylinder; 16-Pressure plate; 17-Support frame 2; 18-Support plate 2; 19-Drive motor; 20- Pulley one; 21-Pulley two; 22-Belt; 23-Support tube; 24-Rib three; 25-Connecting plate five; 26-Telescopic cylinder; 27-Connecting plate six; 28-Positioning block; 281-Suction hole; 29-Guide column; 30-Guide sleeve; 31-Vacuum generator; 32-Support plate three; 33-Lifting hydraulic cylinder; 34-Foma wheel; 35-Electrical cabinet; 36-Foot switch; 37-Impeller; 371-Positioning hole; 38-Blade. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] like Figures 1 to 6 As shown, a moving blade welding device for a steam turbine comprises a support plate 1, an impeller clamping mechanism and a blade clamping mechanism, wherein the support plate 1 is arranged in a horizontal front-to-back direction, wherein:

[0022] The impeller clamping mechanism is arranged at the upper rear of the support plate 1 and includes a vertically arranged H-shaped support frame 2, the bottom end of the support frame 2 is welded with a connecting plate 4 by means of a rib plate 3, and the connecting plate 4 is installed on the upper end surface of the support plate 1, the top end of the support frame 2 is welded with a connecting plate 26 by means of a rib plate 25, the upper end surface of the connecting plate 26 is horizontally installed with a connecting plate 3 7, the upper end surface of the connecting plate 3 7 is centrally installed with an inverted T-shaped connecting plate 4 8, the connecting plate 4 8 is centrally installed with a rotating shaft 9 through a bearing, the right end portion of the rotating shaft 9 is coaxially connected to a circular mounting plate 11 through a mounting seat 10, the right end surface of the mounting plate 11 is coaxially provided with a positioning ring 12, the The right end face of the positioning ring 12 is cut with an annular positioning surface 13, and the positioning surface 13 is provided with a circular array of positioning columns 14. The mounting plate 11 is provided with a 90° angle clamping cylinder 15 in a circular array on the inner side of the positioning ring 12, and a clamping plate 16 is provided on the pressing arm of the angle clamping cylinder 15. A right-angled triangle support frame 17 is installed in the middle of the left side of the support frame 1 2, and a support plate 2 18 is horizontally installed on the top of the support frame 2 17. A driving motor 19 is installed on the upper end face of the support plate 2 18, and a pulley 1 20 is keyed to the output shaft of the driving motor 19, and a pulley 21 is keyed to the left end of the rotating shaft 9, and the pulley 1 20 and the pulley 21 are connected by a belt 22;

[0023] The blade clamping mechanism is arranged at the upper front of the support plate 1 and includes a vertically arranged rectangular support tube 23. The bottom end of the support tube 23 is welded with a connecting plate 5 25 by means of a rib plate 3 24, and the connecting plate 5 25 is installed on the upper end surface of the support plate 1. A telescopic cylinder 26 facing backward horizontally is installed on the upper part of the support tube 23. The piston rod of the telescopic cylinder 26 passes through the support tube 23 and is connected to a vertical connecting plate 6 27. A positioning block 28 is installed in the center of the rear side of the connecting plate 6 27. The positioning block 28 is The top contour surface can be adapted to fit with the blade 38. The positioning block 28 is a hollow structure and has suction holes 281 evenly distributed on its top. A vacuum generator 31 is provided on one side of the support frame 17. The vacuum generator 31 is connected to the positioning block 28 through an air pipe. Guide columns 29 are provided parallel and symmetrically on the upper and lower parts of the telescopic cylinder 26. The rear end of the guide column 29 passes through the support tube 23 and is connected to the connecting plate 6 27. A guide sleeve 30 is slidably provided on the guide column 29 and fixed on the support tube 23.

[0024] In the present invention, a wire groove 121 is processed on the outer circumference of the positioning ring 12, and the wire groove 121 is located at the 12 o'clock position on the positioning ring 12. When the impeller 37 with a large volume and a heavy mass is put on or removed from the positioning ring 12, a rope can be put on the impeller 37, and then the impeller 37 can be lifted by a lifting device. By providing the wire groove 121, it is convenient to put on or remove the rope.

[0025] In the present invention, a horizontal support plate 3 32 is provided directly below the support plate 1, and vertically upward lifting hydraulic cylinders 33 are evenly installed on the upper end surface of the support plate 3 32, and the piston rods of the lifting hydraulic cylinders 33 are connected to the lower end surface of the support plate 1. The height of the impeller clamping mechanism and the blade clamping mechanism as a whole can be adjusted by controlling the extension amount of the piston rod of the lifting cylinder 33, thereby adapting to users of different heights or adapting to different welding requirements.

[0026] In the present invention, the lower end surface of the support plate 3 32 is evenly installed with a Forma wheel 34. By installing the Forma wheel 34, the impeller clamping mechanism and the blade clamping mechanism as a whole can be easily moved and stably placed.

[0027] In the present invention, an electrical cabinet 35 is placed on the upper end surface of the support plate 1, and a controller is arranged in the electrical cabinet 35, and the controller is respectively connected to the drive motor 19 and the telescopic cylinder 26, and the controller is also externally connected to a foot switch 36. The controller can realize precise control of the parameters such as the direction and speed of the drive motor 19 and the telescopic amount of the piston rod of the telescopic cylinder 26. The foot switch 36 can control the drive motor 19 to drive the positioning ring 12 to rotate from one welding point to the next welding point.

[0028] In the present invention, the impeller 37 has a circular array of positioning holes 371 that can be matched with the positioning posts 14 .

[0029] In the present invention, the working principle and working process of the moving blade welding device for steam turbine are as follows: first, the positioning surface 13 on the positioning ring 12 is used as the reference surface of the impeller 37, and the impeller 37 is mounted on the positioning column 14 on the positioning ring 12. Then, the impeller 37 is pressed and fixed on the positioning ring 12 by the clamping plate 16 through the contraction of the piston rod of the 90° transfer clamping cylinder. Then, the rear side surface of the connecting plate 6 27 is used as the reference surface of the blade 38, and the blade 38 is placed on the top contour surface of the positioning block 28. Then, a negative pressure environment is formed on the inner side of the suction hole 281 through the vacuum generator 31, and the blade 38 is pressed and fixed on the inner side by the pressure difference between the inside and the outside. The welding end of the blade 38 is contacted with the welding groove on the impeller 38 by extending the piston rod of the telescopic cylinder 26, and then the blade 38 is manually welded with the impeller 37. Then the vacuum generator 31 is suspended, and at the same time, the positioning block 28 is returned to the starting position by shortening the piston rod of the telescopic cylinder 26. Then, the next blade is placed according to the above method, and at the same time, the driving motor 19 drives the impeller 37 to rotate to the next welding groove..., and so on, to complete the welding of all blades 38 on the impeller 37. Finally, the welded impeller assembly is released by extending the piston rod of the 90° transfer clamping cylinder. The present invention realizes the positioning and indexing of the impeller and the positioning and feeding of the blades through the impeller clamping mechanism and the blade clamping mechanism, respectively, so that the welding effect between the impeller and the blade is better. In summary, the moving blade welding device for steam turbine in the present invention has the characteristics of reasonable structure, simple structure, convenient use and good welding effect.

[0030] Therefore, the embodiments disclosed above are only illustrative in all aspects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A moving blade welding device for a steam turbine, characterized in that: It comprises a support plate one (1), an impeller clamping mechanism and a blade clamping mechanism, wherein the support plate one (1) is arranged in a horizontal front-to-back direction, wherein: The impeller clamping mechanism is arranged at the upper rear of the support plate 1 (1) and comprises a vertically arranged H-shaped support frame 1 (2); the bottom end of the support frame 1 (2) is welded with a connecting plate 1 (4) by means of a rib plate 1 (3), and the connecting plate 1 (4) is mounted on the upper end surface of the support plate 1 (1); the top end of the support frame 1 (2) is welded with a connecting plate 2 (6) by means of a rib plate 2 (5); a connecting plate 3 (7) is horizontally mounted on the upper end surface of the connecting plate 2 (6); an inverted T-shaped connecting plate 4 (8) is centrally mounted on the upper end surface of the connecting plate 3 (7); a rotating shaft (9) is centrally mounted on the connecting plate 4 (8) through a bearing; the right end of the rotating shaft (9) is coaxially connected to a circular mounting plate (11) through a mounting seat (10); a positioning ring (12) is coaxially mounted on the right end surface of the mounting plate (11); the ... The right end face of the positioning ring (12) is cut with an annular positioning surface (13), and the positioning surface (13) is provided with a circular array of positioning columns (14); the mounting plate (11) is provided with a 90° rotating angle clamping cylinder (15) in a circular array on the inner side of the positioning ring (12); a pressing plate (16) is provided on the pressing arm of the rotating angle clamping cylinder (15); a right-angled triangle-shaped support frame (17) is installed in the middle of the left side of the support frame (2); a support plate (18) is installed horizontally on the top of the support frame (17); a driving motor (19) is installed on the upper end face of the support plate (18); a pulley (20) is keyed to the output shaft of the driving motor (19); a pulley (21) is keyed to the left end of the rotating shaft (9); and the pulley (20) and the pulley (21) are connected by a belt (22); The blade clamping mechanism is arranged at the front upper part of the support plate 1 (1) and comprises a vertically arranged rectangular support tube (23). The bottom end of the support tube (23) is welded with a connecting plate 5 (25) by means of a rib plate 3 (24), and the connecting plate 5 (25) is installed on the upper end surface of the support plate 1 (1). A telescopic cylinder (26) facing backward horizontally is installed on the upper part of the support tube (23). The piston rod of the telescopic cylinder (26) passes through the support tube (23) and is connected to a vertical connecting plate 6 (27). A positioning block (28) is installed in the center of the rear side of the connecting plate 6 (27). The top of the positioning block (28) is The outer contour surface can be adapted to fit with the blade (38), the positioning block (28) is a hollow structure and has suction holes (281) evenly distributed on the top thereof, a vacuum generator (31) is provided on one side of the support frame (17), and the vacuum generator (31) is connected to the positioning block (28) through an air pipe, and guide pillars (29) are parallelly and symmetrically provided on the upper and lower parts of the telescopic cylinder (26), and the rearward extension end of the guide pillar (29) passes through the support tube (23) and is connected to the connecting plate (27), and a guide sleeve (30) is slidably provided on the guide pillar (29) and the guide sleeve (30) is fixed on the support tube (23); A wire groove (121) is machined on the outer circumference of the positioning ring (12), and the wire groove (121) is located at the 12 o'clock position on the positioning ring (12); A horizontal support plate three (32) is provided directly below the support plate one (1), and vertically upward lifting hydraulic cylinders (33) are evenly installed on the upper end surface of the support plate three (32), and the piston rods of the lifting hydraulic cylinders (33) are connected to the lower end surface of the support plate one (1).

2. A moving blade welding device for a steam turbine according to claim 1, characterized in that: The lower end surface of the support plate three (32) is evenly mounted with Fuma wheels (34).

3. A moving blade welding device for a steam turbine according to claim 1, characterized in that: An electrical cabinet (35) is placed on the upper end surface of the support plate 1 (1). A controller is provided in the electrical cabinet (35). The controller is respectively connected to the drive motor (19) and the telescopic cylinder (26). The controller is also externally connected to a foot switch (36).

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