Multifunctional milling and grinding device for repairing runner blade of water turbine

Abstract

The multifunctional milling and grinding device comprises a rotary table arranged in a working cabin, and a center positioning groove is formed in the rotary table; adjustable supporting mechanisms are arranged on the periphery of the central positioning groove; a transferring mechanism is arranged on one side of the rotary table; a sleeve is arranged on the transferring mechanism; the sleeve is connected with a rotary driving mechanism; an elastic adaptation mechanism is further arranged in the sleeve; the elastic adaptation mechanism is connected with the grinding head; a hanging table is arranged on one side of the transferring mechanism. A flexible structure can be locked and combined with the air cylinder, and when the grinding head is located at the relative position on the blade, the grinding head can be in a flexible state; and during grinding, a locking state can be entered, so that the grinding effect is ensured. Moreover, the elastic adaptation mechanism with elasticity can provide downward pre-pressure for the grinding head, so that the grinding head is tightly attached to the surface of the blade, and the grinding head can be in tight contact with the blade after the position is subsequently locked.

Description

Technical Field

[0001] This invention relates to a milling device, specifically a multi-functional milling device for repairing turbine runner blades, belonging to the technical field of turbine blade operation and maintenance equipment. Background Technology

[0002] After long-term operation, the turbine blades will suffer damage due to various reasons. For example, in rivers with high sediment loads, the sediment carried by the water flow will cause severe corrosion and impact on the blades, reducing their wall thickness and altering their profile. Simultaneously, under load, the blades are also prone to fatigue cracks. However, due to the high cost of the blades, frequent replacement is not feasible. Therefore, to overcome these problems, a welding process is generally used to repair the blades. After welding, excess, protruding weld material needs to be removed using a milling cutter, and then grinding is used to eliminate milling marks and achieve a smooth surface. Therefore, both processes are indispensable. In the past, because the blade surface was an irregular curved surface, automated milling and grinding equipment could not adapt to the changes in the blade surface profile by adjusting the positions of the milling cutter and grinding head accordingly. Therefore, manual milling and grinding were necessary. In the prior art, there are products that can adaptively change the position of the milling cutter to adapt to the curved surface of the blade, such as the blade grinding device for CNC gantry milling machines disclosed in Chinese Patent Document No. CN110883688A. However, the drawback of this type of equipment is that, although the position of the grinding head can be adaptively adjusted, it adopts a flexible structure. However, during the grinding process, the force exerted by the grinding head perpendicularly on the blade grinding position is also particularly important. If the grinding head merely contacts the blade surface without generating a perpendicular force or the force is too small, it will greatly affect the grinding effect. In the aforementioned products, the spring alone is insufficient to provide the grinding head with the corresponding force, resulting in a lack of support for the grinding head. Therefore, further improvements are needed. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a multi-functional milling and grinding device for repairing turbine runner blades. The grinding process is reliable, self-adjustable, highly flexible in use, and improves repair efficiency and quality.

[0004] The technical solution adopted in this invention is as follows: a multi-functional milling device for repairing turbine runner blades, comprising a rotary table set in a working chamber, wherein a central positioning groove is provided on the rotary table; an adjustable support mechanism is provided around the central positioning groove; a transfer mechanism is provided on one side of the rotary table; a sleeve is provided on the transfer mechanism; the sleeve is connected to a rotary drive mechanism; an elastic adaptation mechanism is also provided inside the sleeve; the elastic adaptation mechanism is connected to a grinding head; a suspension platform is provided on one side of the transfer mechanism; a drive housing is provided at the bottom of the suspension platform; the drive housing is connected to an extension rod; and a milling cutter is provided at the bottom of the extension rod.

[0005] Furthermore, a plurality of sliding holes are provided on the inner wall of the central positioning groove; each sliding hole communicates with the chamber; a clamping block is elastically connected in the sliding hole; a cylinder is provided in the chamber; the side of the clamping block near the cylinder is wedge-shaped; the other end of the clamping block passes through the sliding hole and abuts against the rotating wheel seat in the central positioning groove.

[0006] Furthermore, each set of adjustable support mechanisms includes at least two support platforms mounted on a rotary table; each support platform has a telescopic arm slidably connected to its two sides; a support block is rotatably mounted at the end of each telescopic arm; the support block has support protrusions at both ends; a fan-shaped corner adjustment plate is mounted on the upper side of the support block; several through holes are evenly distributed on the corner adjustment plate; and an insertion hole is mounted at the end of each telescopic arm.

[0007] Furthermore, the transfer mechanism includes an X-axis guide rail and an X-axis slider; a Y-axis guide rail is provided on the X-axis slider; a Y-axis slider is provided on the Y-axis guide rail; the sleeve is mounted on the Y-axis slider via a bracket; a raised edge is provided on the outer bottom of the sleeve; a ball is provided at the bottom of the raised edge; an annular groove is provided on the surface of the bracket relative to the ball; the ball is tumbling within the annular groove.

[0008] Furthermore, the elastic adaptation mechanism includes a lifting rod coaxially disposed within the sleeve; a protrusion is provided on the outer side of the lifting rod; a sliding groove is provided on the inner wall of the sleeve relative to the protrusion; the protrusion is slidably disposed within the sliding groove; a spring is also disposed within the sliding groove; the spring is connected to the protrusion.

[0009] Furthermore, the lifting rod axially penetrates the sleeve; the bottom of the bracket has a through hole relative to the lifting rod; and the grinding head is located at the bottom of the lifting rod.

[0010] Furthermore, a gear ring is provided on the outer side of the sleeve; a first motor is also provided on the bracket; the first motor is provided with a drive gear; the drive gear meshes with the gear ring; and the bracket is also provided with a stop cylinder.

[0011] Furthermore, the abutting cylinder is located above the sleeve; the piston end of the abutting cylinder is provided with an abutting block that contacts the upper end of the lifting rod; a second motor is provided inside the drive housing; the second motor is connected to the main gear; the main gear is connected to the driven gear; and the driven gear is sleeved on the outside of the rotary column.

[0012] Furthermore, the extension rod is located at the bottom of the rotary column; a third motor is also provided on the surface of the suspension platform.

[0013] Furthermore, the third motor is connected to the lead screw; a ball bearing slider is provided on the outer sleeve of the lead screw; the ball bearing slider is connected inside the drive housing.

[0014] This invention offers the following advantages: Before grinding, the sleeve reaches a suitable height under the action of the transfer mechanism until the elastic adaptation mechanism in the sleeve drives the grinding head to contact the blade surface. However, the elastic adaptation mechanism alone is insufficient to provide enough support for the grinding head. Therefore, as the rotary table rotates the blade, after the grinding head moves to the position to be ground on the blade, the elastic adaptation mechanism is locked by the cylinder, preventing upward displacement. This ensures that the grinding head has sufficient downward pressure during grinding. After grinding, the rotary table continues to rotate, the cylinder returns to its initial position, and the grinding head can then move relative to the blade to the next position to be ground. This invention combines a flexible structure with cylinder locking. When the grinding head is in a relative position on the blade, it can be in a flexible state; during grinding, it can enter a locked state to ensure the grinding effect. Furthermore, the elastic adaptation mechanism provides a downward pre-pressure to the grinding head, ensuring that the grinding head adheres tightly to the blade surface. After the locking position is reached, the grinding head can make close contact with the blade.

[0015] Meanwhile, the milling cutter can be moved to the position on the blade that needs to be milled under the drive of the extension rod, and the contact between the milling cutter and the blade surface can be controlled by the up and down displacement of the drive housing. Since the milling process does not need to be in close contact with the blade surface compared to the grinding process, elastic preload is not used. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the sleeve's installation structure on the bracket.

[0018] Figure 3 This is a schematic diagram of the elastic adaptation mechanism inside the sleeve.

[0019] Figure 4 This is a schematic diagram of the internal structure of the central positioning groove.

[0020] Figure 5 This is a schematic diagram of the adjustable support mechanism (view from top).

[0021] Figure 6 This is a structural diagram of the adjustable support mechanism from another angle.

[0022] Figure 7 This is a schematic diagram of the internal structure of the drive chassis.

[0023] Wherein: 1 is the rotary table, 2 is the center positioning groove, 201 is the sliding hole, 202 is the chamber, 4 is the sleeve, 401 is the sliding groove, 5 is the grinding head, 6 is the suspension table, 7 is the drive housing, 8 is the extension rod, 9 is the milling cutter, 10 is the clamping block, 11 is the cylinder, 12 is the support table, 13 is the telescopic arm, 14 is the support block, 15 is the angle adjustment plate, 16 is the X-axis guide rail, 17 is the X-axis slider, 18 is the Y-axis guide rail, 1 9 is the Y-axis slider, 20 is the bracket, 21 is the raised edge, 22 is the ball bearing, 23 is the annular groove, 24 is the lifting rod, 2401 is the protrusion, 25 is the first motor, 26 is the drive gear, 27 is the abutting cylinder, 28 is the abutting block, 29 is the second motor, 30 is the main gear, 31 is the driven gear, 32 is the rotary column, 33 is the third motor, 34 is the lead screw, 35 is the ball bearing slider, 36 is the gear ring, and 37 is the grinding head. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] See Figures 1-7 This application discloses a multi-functional milling device for repairing turbine runner blades, including a rotary table 1 installed in a working chamber, a central positioning groove 2 on the rotary table 1, an adjustable support mechanism around the central positioning groove 2, a transfer mechanism on one side of the rotary table 1, a sleeve 4 on the transfer mechanism, the sleeve 4 being connected to a rotary drive mechanism, an elastic adaptation mechanism inside the sleeve 4, the elastic adaptation mechanism being connected to a grinding head 5, a suspension platform 6 on one side of the transfer mechanism, a drive housing 7 at the bottom of the suspension platform 6, the drive housing 7 being connected to an extension rod 8, and a milling cutter 9 at the bottom of the extension rod 8.

[0026] Furthermore, the inner wall of the central positioning groove 2 is provided with a plurality of sliding holes 201; each of the sliding holes 201 is connected to the chamber 202; a clamping block 10 is elastically connected in the sliding hole 201; a cylinder 11 is provided in the chamber 202; the side of the clamping block 10 near the cylinder 11 is wedge-shaped; the other end of the clamping block 10 passes through the sliding hole 201 and abuts against the rotating wheel seat in the central positioning groove 2.

[0027] Specifically, in this embodiment, the turbine runner's runner seat is inserted into the central positioning groove 2, and then the cylinder 11 is activated, causing the piston of the cylinder 11 to move downward and contact the wedge-shaped surface of the clamping block 10, pushing the clamping block 10 to move outward along the sliding hole 201 until it abuts against the outer surface of the runner seat.

[0028] Multiple clamping blocks 10 clamp the turbine runner from different directions to achieve the positioning of the turbine runner.

[0029] Furthermore, each set of adjustable support mechanisms includes at least two support platforms 12 disposed on the rotary table 1; each support platform 12 has a telescopic arm 13 slidably connected to its two sides; a support block 14 is rotatably disposed at the end of the telescopic arm 13; the two ends of the support block 14 have support protrusions; a fan-shaped corner adjustment plate 15 is disposed on the upper side of the support block 14; several through holes are evenly distributed on the corner adjustment plate 15; and an insertion hole is disposed at the end of the telescopic arm 13.

[0030] Specifically, after completing the positioning of the rotary seat, manually adjust the telescopic arms 13 at both ends of each support platform 12 to make them in a suitable horizontal position, adjust the angle of the support block 14, and insert the corresponding pin into the angle adjustment plate 15 to fix the current angle, so that the support block 14 can provide support for the blade from below from the most suitable position and at the most suitable angle to ensure the effect of milling and grinding.

[0031] Furthermore, the transfer mechanism includes an X-axis guide rail 16 and an X-axis slider 17; a Y-axis guide rail 18 is provided on the X-axis slider 17; a Y-axis slider 19 is provided on the Y-axis guide rail 18; the sleeve 4 is mounted on the Y-axis slider 19 via a bracket 20; a raised edge 21 is provided on the outer bottom of the sleeve 4; a ball bearing 22 is provided at the bottom of the raised edge 21; an annular groove 23 is provided on the surface of the bracket 20 relative to the ball bearing 22; the ball bearing 22 is rotatably disposed within the annular groove 23.

[0032] Furthermore, the elastic adaptation mechanism includes a lifting rod 24 coaxially disposed within the sleeve 4; a protrusion 2401 is provided on the outer side of the lifting rod 24; a sliding groove 401 is provided on the inner wall of the sleeve 4 relative to the protrusion 2401; the protrusion 2401 is slidably disposed within the sliding groove 401; a spring is also disposed within the sliding groove 401; the spring is connected to the protrusion 2401.

[0033] Furthermore, the lifting rod 24 axially penetrates the sleeve 4; the bottom of the bracket 20 is provided with a through hole relative to the lifting rod 24; and the grinding head 5 is disposed at the bottom of the lifting rod 24.

[0034] Furthermore, a gear ring 36 is provided on the outer side of the sleeve 4; a first motor 25 is also provided on the bracket 20; the first motor 25 is provided with a drive gear 26; the drive gear 26 meshes with the gear ring 36; and the bracket 20 is also provided with a stop cylinder 27.

[0035] Furthermore, the abutting cylinder 27 is located above the sleeve 4; the piston end of the abutting cylinder 27 is provided with an abutting block 28 that contacts the upper end of the lifting rod 24.

[0036] Specifically, in this embodiment, the abutting block 28 that initially abuts against the bottom of the cylinder 27 separates from the top of the lifting rod 24. As the rotary table rotates, the grinding head at the lower end of the lifting rod 24 moves relative to the blade surface until it reaches the grinding position. During this process, the upper end of the lifting rod 24 does not abut against anything, so the lifting rod 24 and the grinding head can rise and fall with the undulations of the blade surface, which adapts well to the curvature of the blade.

[0037] Once the grinding position is reached, the abutment cylinder 27 drives the abutment block 28 to descend, and the abutment block 28 contacts the upper end of the lifting rod 24. At this time, the grinding head is fixed in relative position on the blade surface and is pressed down on the blade surface. Subsequently, the first motor 25 starts to work, driving the drive gear 26 to rotate, which in turn drives the sleeve 4 to rotate through the gear ring 24. Since the sleeve 4 and the lifting rod 24 are relatively fixed, the lifting rod 24 and the grinding head at its bottom will also start to rotate, thus entering the grinding state. This grinding is in a downward pressing state, and the grinding effect is controllable.

[0038] Furthermore, a second motor 29 is provided inside the drive housing 7; the second motor 29 is connected to the main gear 30; the main gear 30 is connected to the driven gear 31; and the driven gear 31 is sleeved on the outside of the rotary column 32.

[0039] Furthermore, the extension rod 8 is located at the bottom of the rotary column 32; a third motor 33 is also provided on the surface of the suspension platform 6.

[0040] Furthermore, the third motor 33 is connected to the lead screw 34; the lead screw 34 is fitted with a ball bearing slider 35; the ball bearing slider 35 is connected inside the drive housing 7.

[0041] Specifically, in this embodiment, the second motor 29 inside the drive housing 7 can drive the extension rod 8 to swing through the main gear 30 and the driven gear 31, thereby adjusting the horizontal position of the milling cutter; at the same time, the operation of the third motor 33 can cause the lead screw 34 to rotate, thereby causing the ball block 35 to drive the entire drive housing 7 to move up and down, thereby making the milling cutter approach or move away from the blade surface.

[0042] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-functional milling device for repairing turbine runner blades, comprising a rotary table (1) installed in a working chamber, characterized in that: The rotary table (1) is provided with a central positioning groove (2); an adjustable support mechanism is provided around the central positioning groove (2); a transfer mechanism is provided on one side of the rotary table (1); a sleeve (4) is provided on the transfer mechanism; the sleeve (4) is connected to the rotary drive mechanism; an elastic adaptation mechanism is also provided inside the sleeve (4); the elastic adaptation mechanism is connected to the grinding head (5); a suspension platform (6) is provided on one side of the transfer mechanism; a drive housing (7) is provided at the bottom of the suspension platform (6); the drive housing (7) is connected to the extension rod (8); a milling cutter (9) is provided at the bottom of the extension rod (8).

2. The multi-functional milling device for repairing turbine runner blades according to claim 1, characterized in that: The inner wall of the central positioning groove (2) is provided with a plurality of sliding holes (201); each sliding hole (201) is connected to the chamber (202); a clamping block (10) is elastically connected in the sliding hole (201); a cylinder (11) is provided in the chamber (202); the side of the clamping block (10) near the cylinder (11) is wedge-shaped; the other end of the clamping block (10) passes through the sliding hole (201) and abuts against the rotating seat in the central positioning groove (2).

3. The multi-functional milling device for repairing turbine runner blades according to claim 1, characterized in that: Each adjustable support mechanism includes at least two support platforms (12) mounted on a rotary table (1); each support platform (12) has a telescopic arm (13) slidably connected to its two sides; a support block (14) is rotatably mounted at the end of the telescopic arm (13); the support block (14) has support protrusions at both ends; a fan-shaped corner adjustment plate (15) is mounted on the upper side of the support block (14); several through holes are evenly distributed on the corner adjustment plate (15); and an insertion hole is mounted at the end of the telescopic arm (13).

4. The multi-functional milling device for repairing turbine runner blades according to claim 1, characterized in that: The transfer mechanism includes an X-axis guide rail (16) and an X-axis slider (17); a Y-axis guide rail (18) is provided on the X-axis slider (17); a Y-axis slider (19) is provided on the Y-axis guide rail (18); the sleeve (4) is mounted on the Y-axis slider (19) via a bracket (20); a raised edge (21) is provided on the outer bottom of the sleeve (4); a ball bearing (22) is provided at the bottom of the raised edge (21); an annular groove (23) is provided on the surface of the bracket (20) relative to the ball bearing (22); the ball bearing (22) is tumbling within the annular groove (23).

5. The multi-functional milling device for repairing turbine runner blades according to claim 4, characterized in that: The elastic adaptation mechanism includes a lifting rod (24) coaxially disposed within the sleeve (4); a protrusion (2401) is provided on the outer side of the lifting rod (24); a sliding groove (401) is provided on the inner wall of the sleeve (4) relative to the protrusion (2401); the protrusion (2401) is slidably disposed within the sliding groove (401); a spring is also provided within the sliding groove (401); the spring is connected to the protrusion (2401).

6. The multi-functional milling device for repairing turbine runner blades according to claim 5, characterized in that: The lifting rod (24) passes through the sleeve (4) axially; the bottom of the bracket (20) is provided with a through hole relative to the lifting rod (24); the grinding head (5) is provided at the bottom of the lifting rod (24).

7. A multi-functional milling device for repairing turbine runner blades according to claim 6, characterized in that: A gear ring (24) is provided on the outer side of the sleeve (4); a first motor (25) is also provided on the bracket (20); the first motor (25) is provided with a drive gear (26); the drive gear (26) meshes with the gear ring (24); the bracket (20) is also provided with an abutment cylinder (27).

8. A multi-functional milling device for repairing turbine runner blades according to claim 7, characterized in that: The abutting cylinder (27) is located above the sleeve (4); the piston end of the abutting cylinder (27) is provided with an abutting block (28) that contacts the upper end of the lifting rod (24); the drive housing (7) is provided with a second motor (29); the second motor (29) is connected to the main gear (30); the main gear (30) is connected to the driven gear (31); the driven gear (31) is sleeved on the outside of the rotating column (32).

9. A multi-functional milling device for repairing turbine runner blades according to claim 8, characterized in that: The extension rod (8) is located at the bottom of the rotary column (32); a third motor (33) is also provided on the surface of the suspension platform (6).

10. A multi-functional milling device for repairing turbine runner blades according to claim 9, characterized in that: The third motor (33) is connected to the lead screw (34); the lead screw (34) is fitted with a ball slider (35); the ball slider (35) is connected inside the drive housing (7).

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