A kind of automatic polishing mechanism for steam turbine blade edge portion

Abstract

This invention discloses an automatic grinding mechanism for the edge of steam turbine blades, comprising a frame. Two through slots extending forward and backward are formed in the center of the top surface of the top plate of the frame. A lifting limit frame is provided below the top plate of the frame, with the upper parts of the left and right side plates of the lifting limit frame extending out of the corresponding through slots and engaging with them. A rear support plate is fixed to the rear of the top surface of the top plate of the frame, and multiple side legs are fixed to the top surface of the top plate of the frame at the outer sides of the two side plates. An upper fixing plate is fixed to the top surface of all the side legs and the rear support plate. This mechanism can automatically grind the left and right side walls of the leading edge and root of the blade, ensuring grinding flatness and effect, greatly reducing manual labor, and achieving high grinding precision.

Description

Technical Field

[0001] This invention relates to the field of turbine blade processing technology, and more specifically to an automatic grinding mechanism for the edge of turbine blades. Background Technology

[0002] Steam turbine blades are core components of power plant generator sets, such as various twisted blades, magnetic ring guide blades, and diamond-shaped moving blades. Generally, a blade consists of a root and the leading edge of the blade body. The side walls of both the root and the leading edge are horizontal. However, the side walls of the leading edge and the root of some blades are aligned front to back. After machining, the blades need to be polished to remove burrs. Currently, the side walls of the root are polished manually first, and then the side walls of the leading edge are polished. However, the flatness accuracy of manual polishing is limited, and the amount of manual labor is large. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an automatic grinding mechanism for the edge of steam turbine blades. It can automatically grind the front end and the left and right side walls of the blade root, ensuring the smoothness and effect of grinding, greatly reducing the amount of manual labor, and has high grinding precision.

[0004] The solution of the present invention to the aforementioned technical problem is:

[0005] An automatic grinding mechanism for the edge of a steam turbine blade includes a frame. Two through slots extending forward and backward are formed in the middle of the top surface of the top plate of the frame. A lifting limit frame is provided below the top plate of the frame. The upper parts of the left and right side plates of the lifting limit frame extend out of the corresponding through slots and cooperate with the through slots.

[0006] A rear support plate is fixed to the rear of the top surface of the top plate of the frame, and multiple side legs are fixed to the top surface of the top plate of the frame at the outer side of the two side plates. An upper fixing plate is fixed to the top surface of all the side legs and the rear support plate.

[0007] A left-side grinding device is fixed on the inner wall of all the left-side side legs, and a right-side grinding device is fixed on the inner wall of all the right-side side legs. The grinding discs of the left-side grinding device and the right-side grinding device face the corresponding side plates.

[0008] The upper fixed plate has a pressing cylinder fixed to the rear and front of the top surface. The bottom end of the push rod of the pressing cylinder extends out of the bottom surface of the upper fixed plate and is fixed with a pressing plate.

[0009] Multiple vertical guide rods are fixed on the top surface of the clamping plate, and the top ends of the vertical guide rods extend into the guide through holes formed on the upper fixing plate.

[0010] Below the clamping plate is a buffer plate. Multiple vertical screws are fixed on the top surface of the buffer plate. The top of the vertical screws extends out of the top of the corresponding through hole on the clamping plate and is screwed with a nut. The nut presses against the top surface of the clamping plate. A buffer spring is inserted on the vertical screw. The bottom end of the buffer spring applies force to the top surface of the buffer plate, and the top end of the buffer spring applies force to the top surface of the clamping plate.

[0011] The frame has a lower horizontal plate below the top plate. The left and right side walls of the lower horizontal plate are fixed to the side support plates below the left and right sides of the top plate of the frame. A vertical lifting screw is movably connected to one side of the top surface of the lower horizontal plate through a bearing. The top of the vertical lifting screw is movably connected to the bottom surface of the top plate of the frame through a bearing. A lifting motor is fixed to the bottom surface of the lower horizontal plate. The lifting plate of the lifting limit frame is screwed onto the vertical lifting screw.

[0012] The lifting limit frame includes a lifting plate and two side plates fixed to the middle of the top surface of the lifting plate;

[0013] A guide sleeve is fixed on the inner sidewall of the through groove, and the side plate is inserted into the corresponding guide sleeve, with the side wall of the side plate tightly attached to the corresponding inner sidewall of the corresponding guide sleeve.

[0014] The left and right grinding devices have the same structure, both including a front-to-back moving mechanism and a vertical moving mechanism. The side connecting plate of the front-to-back moving mechanism is fixed to the inner wall of all the side legs on the same side. The vertical connecting plate of the vertical moving mechanism is fixed to the side wall of the front-to-back moving block of the front-to-back moving mechanism. The vertical lifting block of the vertical moving mechanism is fixed to the wall near the corresponding side plate. An electric push rod is fixed to the outer fixed plate of the telescopic frame. The end of the push rod of the electric push rod extends out of the inner fixed plate of the telescopic frame and is fixed to a connecting block. A first connecting plate is fixed to the middle of the inner wall of the connecting block. A motor frame is installed on the inner side of the first connecting plate. A grinding motor is fixed to the inner wall of the inner plate of the motor frame. The end of the output shaft of the grinding motor extends out of the inner plate of the motor frame and is fixed to a grinding disc.

[0015] Multiple transverse guide screws are fixed on the outer wall of the outer side plate of the motor frame. The outer end of the transverse guide screw extends out of the corresponding through hole of the first connecting plate and is screwed with a nut. The nut presses against the outer wall of the first connecting plate. The first buffer spring is inserted into the transverse guide screw. One end of the first buffer spring is applied to the first connecting plate, and the other end of the first buffer spring is applied to the outer side plate of the motor frame.

[0016] The outstanding effects of this invention are:

[0017] It can automatically polish the front end and the left and right side walls of the blade root, ensuring the smoothness and effect of polishing, greatly reducing the amount of manual labor, and its polishing precision is high. Attached Figure Description

[0018] Figure 1 This is a partial structural schematic diagram of the present invention;

[0019] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0020] Figure 3 This is a partial top view of the frame of the present invention;

[0021] Figure 4 yes Figure 3 A magnified view of a portion of the image;

[0022] Figure 5 This is a partial structural diagram of the clamping plate of the present invention. Detailed Implementation

[0023] For example, see below. Figures 1 to 5 As shown, an automatic grinding mechanism for the edge of a steam turbine blade includes a frame 10. The top surface of the top plate of the frame 10 has two through slots 11 extending forward and backward. A lifting limit frame 20 is provided below the top plate of the frame 10. The upper parts of the left and right side plates 21 of the lifting limit frame 20 extend out of the corresponding through slots 11 and cooperate with the through slots 11.

[0024] A rear support plate 12 is fixed to the rear part of the top surface of the top plate of the frame 10, and multiple side legs 13 are fixed to the top surface of the top plate of the frame 10 at the outer side of the two side plates 21. An upper fixing plate 14 is fixed to the top surface of all the side legs 13 and the rear support plate 12.

[0025] A limiting connecting block 80 is fixed in the middle of the front wall of the rear support plate 12. A screw hole is formed in the middle of the front end face of the limiting connecting block 80, and an insertion hole is formed in the middle of the rear end face of the screw hole. The insertion hole corresponds to and communicates with the through hole in the middle of the rear support plate 12. A screw part is formed in the middle of the rear wall of the limiting suction block 81, which is screwed into the screw hole. A through screw hole is formed in the middle of the screw part. A suction cover 82 is fixed in the front end of the limiting suction block 81. Multiple suction through holes are formed on the suction cover 82. A suction chamber is formed between the limiting suction block 81 and the suction cover 82. The suction through holes and the screw through holes are the same as the suction chamber. A rotary joint is screwed to the rear end of the screw through hole of the screw part. The rear end of the rotary joint extends out of the through hole in the middle of the rear support plate 12 and can be connected to the suction pipe connected to the control valve on the suction pump.

[0026] The same left-side grinding device 30 is fixed on the inner wall of all the side legs 13 on the left side, and the same right-side grinding device 40 is fixed on the inner wall of all the side legs 13 on the right side. The grinding discs 391 of the left-side grinding device 30 and the right-side grinding device 40 face the corresponding side plates 21.

[0027] The upper fixing plate 14 has a pressing cylinder 15 fixed at the rear and front of the top surface. The bottom end of the push rod of the pressing cylinder 15 extends out of the bottom surface of the upper fixing plate 14 and is fixed with a pressing plate 16.

[0028] Furthermore, a plurality of vertical guide rods 161 are fixed on the top surface of the clamping plate 16, and the top ends of the vertical guide rods 161 extend into the guide through holes formed on the upper fixing plate 14.

[0029] Furthermore, a buffer plate 17 is provided below the clamping plate 16. A plurality of vertical screws 171 are fixed on the top surface of the buffer plate 17. The top end of the vertical screws 171 extends out of the top end of the corresponding through hole on the clamping plate 16 and is screwed with a nut. The nut presses against the top surface of the clamping plate 16. A buffer spring 172 is inserted into the vertical screw 171. The bottom end of the buffer spring 172 applies to the top surface of the buffer plate 17, and the top end of the buffer spring 172 applies to the top surface of the clamping plate 16.

[0030] The bottom surface of the buffer plate 17 is fixed with an elastic anti-slip layer 173. The elastic anti-slip layer 173 can ensure that the front end or root of the blade is pressed firmly against the ground.

[0031] Furthermore, a lower horizontal plate 18 is provided below the top plate of the frame 10. The left and right side walls of the lower horizontal plate 18 are fixed to the side support plates below the left and right sides of the top plate of the frame 10. A vertical lifting screw 19 is movably connected to one side of the top surface of the lower horizontal plate 18 via a bearing. The top end of the vertical lifting screw 19 is movably connected to the bottom surface of the top plate of the frame 10 via a bearing. A lifting motor 181 is fixed to the bottom surface of the lower horizontal plate 18. The output shaft of the lifting motor 181 is a splined shaft, which is inserted into the vertical... In the spline hole at the bottom end of the lifting screw 19, the lifting motor 181 drives the vertical lifting screw 19 to rotate. The lifting plate 22 of the lifting limit frame 20 is screwed onto the vertical lifting screw 19. A plurality of first vertical guide rods 1 are provided between the top plate and the lower horizontal plate 18 of the frame 10. The top end of the first vertical guide rod 1 is fixed on the top plate of the frame 10, and the bottom end of the first vertical guide rod 1 is fixed on the lower horizontal plate 18. The first vertical guide rod 1 is inserted into the vertical guide through hole formed on the lifting plate 22.

[0032] Furthermore, the lifting limit frame 20 includes a lifting plate 22 and two side plates 21 fixed to the middle of the top surface of the lifting plate 22;

[0033] A guide sleeve 111 is fixed on the inner side wall of the through groove 11, and the side plate 21 is inserted into the corresponding guide sleeve 111, with the side wall of the side plate 21 closely attached to the corresponding inner side wall of the corresponding guide sleeve 111.

[0034] Furthermore, the left grinding device 30 and the right grinding device 40 have the same structure, both including a front-to-back moving mechanism 31 and a vertical moving mechanism 32. The front-to-back moving mechanism 31 includes a side connecting plate, and connecting plates are fixed on the inner side walls of both the front and rear ends of the side connecting plate. The two ends of the front-to-back moving screw are movably connected to the two connecting plates through bearings. A front-to-back moving motor is fixed on one of the connecting plates. The output shaft of the front-to-back moving motor is a spline shaft, which is inserted into the spline hole at one end of the corresponding front-to-back moving screw. The front-to-back moving motor drives the front-to-back moving screw to rotate. The front-to-back moving block is screwed onto the front-to-back moving screw. A front-to-back extending guide rail is fixed on the side connecting plate. A guide block is fixed on the front-to-back moving block, and the guide block is inserted into the corresponding inner end guide rail.

[0035] The side connecting plate of the front and rear moving mechanism 31 is fixed on the inner side wall of all the side legs 13 on the same side. The vertical connecting plate of the vertical moving mechanism 32 is fixed on the side wall of the front and rear moving block of the front and rear moving mechanism 31. The vertical moving mechanism 32 is basically the same as the front and rear moving mechanism 31, except that it is set vertically. Therefore, the vertical moving mechanism 32 will not be described in detail.

[0036] A telescopic frame 34 is fixed on the wall of the vertical lifting block 33 of the vertical moving mechanism 32 near the corresponding side plate 21. An electric push rod 35 is fixed on the outer fixed plate of the telescopic frame 34. The end of the push rod of the electric push rod 35 extends out of the inner fixed plate of the telescopic frame 34 and is fixed with a connecting block 36. A first connecting plate 37 is fixed in the middle of the inner wall of the connecting block 36. A motor frame 38 is installed on the inner side of the first connecting plate 37. A grinding motor 39 is fixed on the inner wall of the inner side plate of the motor frame 38. The end of the output shaft of the grinding motor 39 extends out of the inner side plate of the motor frame 38 and is fixed with a grinding disc 391.

[0037] Multiple transverse guide screws 381 are fixed on the outer wall of the outer side plate of the motor frame 38. The outer end of the transverse guide screw 381 extends out of the corresponding through hole of the first connecting plate 37 and is screwed with a nut. The nut presses against the outer wall of the first connecting plate 37. The first buffer spring 382 is inserted into the transverse guide screw 381. One end of the first buffer spring 382 is applied to the first connecting plate 37, and the other end of the first buffer spring 382 is applied to the outer side plate of the motor frame 38.

[0038] Furthermore, a proximity switch 3 is fixed in the middle of the inner sidewall of the first connecting plate 37, and a sensing block 4 is fixed in the middle of the outer sidewall of the outer sideplate of the motor frame 38, with the sensing block 4 facing the sensing end of the proximity switch 3.

[0039] Furthermore, a main transverse guide rod 361 is fixed on the outer wall of the connecting block 36, and the main transverse guide rod 361 is inserted into the corresponding transverse guide through hole on the inner fixed plate of the telescopic frame 34. In this embodiment, all electrical equipment is electrically connected to the control host via electrical connection lines, and all hydraulic equipment is connected to the control valve of the hydraulic system via connecting cylinders. This is a conventional structure and will not be described in detail here.

[0040] In this embodiment, the lifting motor 181 is first operated, causing the top ends of the two side plates 21 to extend out of the corresponding through slots 11. At this time, the blade to be processed can be placed between the two side plates 21 to achieve positioning. At the same time, the rear end face of the blade is pressed against the elastic layer fixed on the end face of the suction cover 82. The elastic layer has multiple through holes formed on it, which are connected to and aligned with the corresponding suction through holes. By rotating the limiting suction block 81, the suction cover 82 can be adjusted back and forth for fine adjustment to meet the positioning requirements of the blade during processing.

[0041] The rear end of its rotary joint extends out of the through hole in the middle of the rear support plate 12, which can be connected to the suction pipe connected to the control valve on the suction pump. Therefore, only air needs to be sucked in to adsorb the rear end of the blade, making it difficult for it to move. Then, by pushing with two clamping cylinders 15, the two elastic anti-slip layers 173 are pressed against the top surface of the blade root end and the top surface of the front end of the blade, respectively, to achieve clamping and fixing. During the clamping process, the buffer spring 172 can reduce the impact of the downward pressure, ensuring that the blade is not subjected to excessive impact and ensuring normal subsequent processing.

[0042] Then, the lifting motor 181 operates, causing the two side plates 21 to descend and retract. Then, through the operation of the forward and backward moving mechanism 31 and the vertical moving mechanism 32, the grinding disc 391 can move up and down and forward and backward. The electric push rod 35 operates, adjusting the left and right movement of the grinding disc 391. And through the operation of the grinding motor 39, the grinding disc 391 can rotate, allowing the grinding disc 391 to be pressed tightly against the side wall of the blade root end or front end for grinding. The grinding disc 391 presses against the blade... When the blade root end or front end sidewall is polished, the first buffer spring 382 is compressed and pressed against the sensing end of the proximity switch 3 through the sensing block 4. At this time, it indicates that the polishing disc 391 is in position (the pressure on the polishing area is also in place). The sensing signal of the proximity switch 3 is sent to the control host, and the control host controls the corresponding electric push rod 35 to stop running. Through the operation of the forward and backward moving mechanism 31 and the vertical moving mechanism 32, the sidewall of the blade root end or front end can be polished. The polishing effect is good and the efficiency is high.

[0043] After grinding, all parts are returned to their original positions. At the same time, the suction pipe stops sucking air, which stops the suction cover 82 of the limiting suction block 81 and fixes it in place. The blade can then be removed and replaced with a new blade for processing, which is very convenient.

Claims

1. A mechanism for automatic polishing of the edge of a turbine blade, comprising a frame (10), characterized in that: The middle part of the top surface of the top plate of the rack (10) is formed with two front and rear extending through grooves (11), the lower part of the top plate of the rack (10) is provided with a lifting limiting frame (20), the upper part of the left and right two side plates (21) of the lifting limiting frame (20) extends out of the corresponding through grooves (11) and matches with the through grooves (11); The rear part of the top surface of the top plate of the rack (10) is fixed with a rear support plate (12), the top surface of the top plate of the rack (10) at the outer side of the two side plates (21) is fixed with a plurality of side legs (13), an upper fixed plate (14) is fixed on the top surface of all the side legs (13) and the rear support plate (12); The inner side wall of all the side legs (13) on the left side is fixed with a left side polishing device (30), the inner side wall of all the side legs (13) on the right side is fixed with a right side polishing device (40), the polishing disc (391) of the left side polishing device (30) and the right side polishing device (40) faces the corresponding side plate (21); The rear part and the front part of the top surface of the upper fixed plate (14) are fixed with pressing oil cylinders (15), the bottom end of the push rod of the pressing oil cylinder (15) extends out of the bottom surface of the upper fixed plate (14) and is fixed with a pressing plate (16); The middle part of the front wall surface of the rear support plate (12) is fixed with a limiting connecting block (80), the middle part of the front end surface of the limiting connecting block (80) is formed with a screw joint hole, the middle part of the rear wall surface of a limiting air suction block (81) is formed with a screw joint part which is screwed in the screw joint hole, the front end of the limiting air suction block (81) is fixed with an air suction cover (82); The lower part of the top plate of the rack (10) is provided with a lower horizontal plate (18), the left and right side walls of the lower horizontal plate (18) are fixed on the side support plates below the left and right sides of the top plate of the rack (10), one side of the top surface of the lower horizontal plate (18) is movably connected with a vertical lifting screw rod (19) through a bearing, the top end of the vertical lifting screw rod (19) is movably connected with the bottom surface of the top plate of the rack (10) through a bearing, the bottom surface of the lower horizontal plate (18) is fixed with a lifting motor (181), the lifting motor (181) drives the vertical lifting screw rod (19) to rotate, the lifting plate (22) of the lifting limiting frame (20) is screwed on the vertical lifting screw rod (19), a plurality of first vertical guide rods (1) are arranged between the top plate of the rack (10) and the lower horizontal plate (18), the top end of the first vertical guide rod (1) is fixed on the top plate of the rack (10), the bottom end of the first vertical guide rod (1) is fixed on the lower horizontal plate (18), the first vertical guide rod (1) is inserted into the vertical guide through hole formed on the lifting plate (22); The blade to be processed is placed between the two side plates (21) to realize limiting, at the same time, the rear end surface of the blade is pressed against the elastic layer fixed on the end surface of the air suction cover (82), the air suction cover (82) is adjusted by rotating the limiting air suction block (81) to make fine adjustment forward and backward; Then, the lifting motor (181) operates to make the two side plates (21) descend and retract to polish.

2. A mechanism for automatic polishing of the edge portion of a turbine blade according to claim 1, characterized in that: The top surface of the pressing plate (16) is fixed with a plurality of vertical guide rods (161), the top end of the vertical guide rod (161) extends out of the guide through hole formed on the upper fixed plate (14).

3. A mechanism for automatic polishing of the edge portion of a turbine blade according to claim 1, characterized in that: A plurality of vertical screws (171) are fixed on the top surface of the buffer pressing plate (17), the top ends of the vertical screws (171) extend out of the top ends of the corresponding through holes in the pressing plate (16) and are screwed with nuts, the nuts are pressed against the top surface of the pressing plate (16), the buffer springs (172) are inserted on the vertical screws (171), the bottom ends of the buffer springs (172) are stressed against the top surface of the buffer pressing plate (17), and the top ends of the buffer springs (172) are stressed against the top surface of the pressing plate (16). An elastic anti-skid layer (173) is fixed on the bottom surface of the buffer pressing plate (17).

4. A mechanism for automatic polishing of the edge portion of a turbine blade according to claim 1, characterized in that: The lifting limiting frame (20) comprises a lifting plate (22) and two side plates (21) fixed on the top middle part of the lifting plate (22). The inner side walls of the through groove (11) are fixed with guide sleeves (111), the side plates (21) are inserted in the corresponding guide sleeves (111), and the side walls of the side plates (21) are tightly attached to the corresponding inner side walls of the guide sleeves (111).

5. A mechanism for automatic polishing of edges of turbine blade according to claim 1, wherein: The left polishing device (30) and the right polishing device (40) are the same in structure, and each comprises a front-back moving mechanism (31) and a vertical moving mechanism (32), the side connecting plates of the front-back moving mechanism (31) are fixed on the inner side walls of all the side supporting legs (13) on the same side, the vertical connecting plates of the vertical moving mechanism (32) are fixed on the side walls of the front-back moving blocks of the front-back moving mechanism (31), the vertical lifting blocks (33) of the vertical moving mechanism (32) are fixed on the wall surface close to the corresponding side plate (21), the outer fixed plates of the telescopic frames (34) are fixed with the electric push rods (35), the ends of the push rods of the electric push rods (35) extend out of the inner fixed plates of the telescopic frames (34) and are fixed with the connecting blocks (36), the inner walls of the middle parts of the connecting blocks (36) are fixed with the first connecting plates (37), the inner side plates of the motor frames (38) are installed on the inner sides of the first connecting plates (37), the inner side walls of the inner side plates of the motor frames (38) are fixed with the polishing motors (39), and the ends of the output shafts of the polishing motors (39) extend out of the inner side plates of the motor frames (38) and are fixed with the polishing discs (391). A plurality of transverse guide screws (381) are fixed on the outer side walls of the outer side plates of the motor frames (38), the outer ends of the transverse guide screws (381) extend out of the corresponding through holes of the first connecting plates (37) and are screwed with nuts, the nuts are pressed against the outer walls of the first connecting plates (37), the first buffer springs (382) are inserted on the transverse guide screws (381), one end of the first buffer springs (382) is stressed against the first connecting plates (37), and the other end of the first buffer springs (382) is stressed against the outer side plates of the motor frames (38).

6. A mechanism for automatic polishing of the edge portion of a turbine blade according to claim 5, characterized in that: The inner side walls of the middle parts of the first connecting plates (37) are fixed with the proximity switches (3), and the outer walls of the middle parts of the outer side plates of the motor frames (38) are fixed with the sensing blocks (4) which face the sensing ends of the proximity switches (3).

7. A mechanism for automatic polishing of the edge portion of a turbine blade according to claim 5, characterized in that: The outer wall surface of the connecting block (36) is fixed with a main transverse guide rod (361), which is inserted into the corresponding transverse guide hole in the inner fixed plate of the telescopic frame (34).

Images