Adapting clamp applied to laser quenching of steam turbine blade

Abstract

The adapter fixture comprises a circular chassis, a clamping shaft is formed in the center of the rear end face of the chassis, a vertical rectangular connecting seat is formed on the front end face of the chassis, and a clamping seat with a mushroom-shaped horizontal section is formed on the front end face of the connecting seat; vertical adjusting grooves penetrating through the two side walls of the clamping seat are formed in the middle and the upper portion of the clamping seat, a transverse limiting stop shaft is inserted into the adjusting grooves, the two ends of the limiting stop shaft extend out of the two side walls of the clamping seat respectively, the middle of the limiting stop shaft is in threaded connection with a vertical adjusting bolt, and the adjusting bolt is pivoted to the clamping seat. The adapter clamp can be used for quickly clamping and positioning bacterial type blades of the same specification, and meanwhile, the adapter clamp can be adjusted, so that the clamping requirements of the bacterial type blades of different specifications can be met.

Description

Technical Field

[0001] This invention relates to the technical field of blade clamps, and more specifically to a transfer clamp for laser hardening of steam turbine blades. Background Technology

[0002] Steam turbine blades are the core components of a steam turbine, converting the thermal energy of high-temperature, high-pressure steam into mechanical energy. Their performance directly affects the efficiency, safety, and reliability of the steam turbine. Because the working environment of steam turbine blades is extremely harsh, requiring them to withstand complex loads such as high temperatures (up to 600℃), high pressures (tens of megapascals), enormous centrifugal forces, steam vibration forces, corrosion, and water droplet erosion in wet steam zones, steam turbine blades generally require quenching treatment. Currently, laser quenching is used to quench the surface of the blades. This is a surface strengthening technology that uses a high-power-density laser beam to rapidly heat and self-cool the blade surface. During the laser quenching process, the steam turbine blade is clamped in a three-jaw chuck, which drives the blade to rotate. Simultaneously, the laser head moves closer to the blade and emits a laser beam that acts on it.

[0003] Currently, turbine blades are clamped and fixed to a three-jaw chuck at the blade root. Taking a blade with a fungus-shaped groove as an example, its blade root has a block structure. When replacing turbine blades, the clamping position changes, requiring corresponding adjustments to the blade clamping position, which indirectly affects the efficiency of laser hardening. Therefore, a quick-positioning and clamping adapter for turbine blades needs to be designed. At the same time, the design of this adapter needs to consider versatility within a reasonable range. For example, different turbine blades have small-scale insertion dimensions at their blade roots, and the adapter needs to be able to be adjusted accordingly to meet the clamping requirements. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a transfer fixture for laser quenching of turbine blades. This transfer fixture can quickly clamp and position fungus-shaped blades of the same specification, and it can also be adjusted to meet the clamping requirements of fungus-shaped blades of different specifications.

[0005] A transfer fixture for laser quenching of turbine blades includes a circular base, a clamping shaft formed at the center of the rear end face of the base, a vertical rectangular connecting seat formed on the front end face of the base, a snap-fit ​​seat with a fungus-shaped horizontal cross-section formed on the front end face of the connecting seat, vertical adjustment grooves formed in the middle and upper parts of the snap-fit ​​seat and penetrating the two side walls of the snap-fit ​​seat, a transverse limiting shaft inserted in the adjustment groove, the two ends of the limiting shaft extending out of the two side walls of the snap-fit ​​seat respectively, and a vertical adjusting bolt screwed in the middle, the adjusting bolt being pivotally connected to the snap-fit ​​seat;

[0006] The front end face of the middle and lower part of the locking seat is formed with a locking groove that penetrates the lower end face of the locking seat and extends to the connecting seat. An obliquely placed locking rod is inserted into the locking groove. A horizontally hinged pin is inserted into the middle and rear part of the locking rod. The two ends of the hinged pin are respectively inserted and fixed on the locking seat. A vertical slot is formed at the rear part of the locking rod. Obliquely placed guide grooves are respectively formed on the inner walls of the two sides of the slot. A vertical guide hole connected to the locking groove is formed on the upper end face of the connecting seat. A threaded hole is formed at the upper end of the guide hole. A push-pull rod is inserted into the guide hole of the connecting seat. A hinged lug is formed at the lower end of the push-pull rod. The lower end of the hinged lug is inserted into the slot of the locking rod and a horizontally placed guide pin is inserted. The two ends of the guide pin are respectively inserted into the guide groove of the locking rod. A limit stud is screwed into the threaded hole of the connecting seat. The lower end of the limit stud is pivotally connected to the upper end of the push-pull rod.

[0007] Preferably, the push-pull rod is cylindrical, and the central axis of the push-pull rod coincides with the central axis of the limiting stud; the upper end face of the push-pull rod abuts against the lower end face of the limiting stud.

[0008] Preferably, the diameter of the push-pull rod is smaller than the diameter of the limiting stud, and the upper end face of the limiting stud is formed with a regular hexagonal countersunk hole. A reamed bolt is inserted into the countersunk hole, and the end of the reamed bolt is screwed and fixed to the push-pull rod.

[0009] Preferably, the diameter of the push-pull rod is equal to the diameter of the guide hole on the connector;

[0010] The horizontal cross-section of the hinged lug on the push-pull rod is rectangular, and the length and width of the horizontal cross-section of the hinged lug are both smaller than the diameter of the guide hole.

[0011] Preferably, the width of the horizontal section of the hinged lug is equal to the slot width of the slot on the locking bar, and the diameter of the guide pin on the hinged lug is equal to the slot width of the guide groove on the locking bar.

[0012] The thickness of the locking rod is equal to the opening of the locking groove on the locking seat.

[0013] Preferably, the center distance from the bottom surface of the locking groove to the hinge pin is greater than the center distance from the rear end of the locking rod to the hinge pin; the center distance from the front end of the locking rod to the hinge pin is greater than the center distance from the front end surface of the locking seat to the hinge pin.

[0014] Preferably, the longitudinal section of the limiting stop shaft is D-shaped, the outer planar wall of the limiting stop shaft faces upward, and the diameter of the arc-shaped outer wall of the limiting stop shaft is equal to the groove width of the adjusting groove on the snap-fit ​​seat.

[0015] The adjusting bolt is an internal hex bolt. The head of the adjusting bolt presses against the upper end face of the snap-fit ​​seat, and the lower end is inserted into the snap-fit ​​seat. A limit sleeve is fixed on the adjusting bolt, and the limit sleeve abuts against the upper bottom surface of the adjusting groove.

[0016] The beneficial effects of this invention are as follows:

[0017] This adapter clamp can quickly clamp and position fungal leaves of the same specification. At the same time, the adapter clamp can be adjusted to meet the clamping needs of fungal leaves of different specifications. Attached Figure Description

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

[0019] Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another angle;

[0020] Figure 3 This is a frontal structural diagram of the present invention;

[0021] Figure 4 This is a side view of the structure of the present invention;

[0022] Figure 5 This is a half-sectional view of the present invention from the side view direction;

[0023] Figure 6 This is a cross-sectional view of the present invention without blades clamped in the side view direction.

[0024] In the diagram: 1. Positioning seat; 11. Insertion hole; 12. Flange; 13. Mounting hole; 14. Connecting boss; 15. Recessed hole; 2. Lower support rod; 21. Limiting hole; 22. Dial wheel mounting groove; 3. Upper support rod; 31. Slot; 32. Limiting opening; 33. Connecting seat; 34. Stud; 35. Upper slot; 4. Tilting frame; 41. Cantilever; 42. Pin; 43. Hinge pin; 5. Hook; 51. Connecting ring; 52. Hook body; 53. Protective head; 6. Adjusting dial wheel; 7. Locking sleeve; 71. Pull ring; 71. Release ring; 72. Transition ring; 73. Locking ring; 8. Spring; 9. Ball bearing. Detailed Implementation

[0025] Example: See Figures 1 to 5 As shown, a transfer fixture for laser quenching of turbine blades includes a circular base 1. A clamping shaft 11 is formed at the center of the rear end face of the base 1. A vertical rectangular connecting seat 12 is formed on the front end face of the base 1. A horizontally cross-section fungus-shaped snap-fit ​​seat 13 is formed on the front end face of the connecting seat 12. Vertical adjustment grooves 14 are formed in the middle and upper parts of the snap-fit ​​seat 13 and penetrate through the two side walls of the snap-fit ​​seat 13. A horizontal limiting stop shaft 2 is inserted into the adjustment groove 14. The two ends of the limiting stop shaft 2 extend out of the two side walls of the snap-fit ​​seat 13 respectively, and a vertical adjusting bolt 3 is screwed into the middle. The adjusting bolt 3 is pivotally connected to the snap-fit ​​seat 13.

[0026] The front end face of the lower part of the locking seat 13 is formed with a locking groove 15 that penetrates the lower end face of the locking seat 13 and extends to the connecting seat 12. An obliquely placed locking rod 4 is inserted into the locking groove 15. A transverse hinge pin 5 is inserted into the middle and rear parts of the locking rod 4. Both ends of the hinge pin 5 are respectively inserted and fixed to the locking seat 13. A vertical slot 41 is formed at the rear part of the locking rod 4. Obliquely placed guide grooves 42 are respectively formed on the inner walls of both sides of the slot 41. A vertical groove communicating with the locking groove 15 is formed on the upper end face of the connecting seat 12. A guide hole 16 is provided, and a threaded hole 17 is formed at the upper end of the guide hole 16. A push-pull rod 6 is inserted into the guide hole 16 of the connecting seat 12. A hinged lug 61 is formed at the lower end of the push-pull rod 6. The lower end of the hinged lug 61 is inserted into the slot 41 of the locking rod 4 and a transverse guide pin 8 is inserted therein. The two ends of the guide pin 8 are respectively inserted into the guide groove 42 of the locking rod 4. A limit stud 7 is screwed into the threaded hole 17 of the connecting seat 12. The lower end of the limit stud 7 is pivotally connected to the upper end of the push-pull rod 6.

[0027] The aforementioned adapter is set between the turbine blade 9 and the three-jaw chuck of the laser quenching equipment. The adapter is fixed to the three-jaw chuck based on the clamping shaft 11 and can rotate with the three-jaw chuck. The blade 9 is provided with a blade root 91, and the blade root 91 is provided with a fungus-shaped snap-fit ​​groove 92 that matches the connecting seat 12. The blade root 91 of the blade 9 is sleeved on the snap-fit ​​seat 13. The two ends of the limiting stop shaft 2 are respectively pressed on the upper end face of the blade root 91. The front end of the locking rod 4 extends out of the front end face of the connecting seat 12 and presses against the lower end face of the blade root 91.

[0028] The push-pull rod 6 is cylindrical, and the central axis of the push-pull rod 6 coincides with the central axis of the limiting stud 7; the upper end face of the push-pull rod 6 abuts against the lower end face of the limiting stud 7, and rotating the limiting stud 7 will not cause jamming due to misalignment;

[0029] The diameter of the push-pull rod 6 is smaller than the diameter of the limiting stud 7. The upper end face of the limiting stud 7 is formed with a regular hexagonal countersunk hole 71. A reamer bolt 20 is inserted into the countersunk hole 71. The end of the reamer bolt 20 is screwed and fixed to the push-pull rod 6. The limiting stud 7 is equivalent to an internal hex bolt. The diameter of the push-pull rod 6 is equal to the diameter of the guide insertion hole 16 on the connecting seat 12. The horizontal cross-section of the hinge lug 61 on the push-pull rod 6 is rectangular. The length and width of the horizontal cross-section of the hinge lug 61 are both smaller than the diameter of the guide insertion hole 16. The hinge lug 61 can retract into the guide insertion hole 16 of the connecting seat 12.

[0030] The width of the horizontal section of the hinge lug 61 is equal to the groove width of the slot 41 on the locking rod 4, and the diameter of the guide pin 8 on the hinge lug 61 is equal to the groove width of the guide groove 42 on the locking rod 4; the thickness of the locking rod 4 is equal to the opening of the locking groove 15 on the snap-fit ​​seat 13.

[0031] The center distance from the rear bottom surface of the locking groove 15 to the hinge pin 5 is greater than the center distance from the rear end of the locking rod 4 to the hinge pin 5; the center distance from the front end of the locking rod 4 to the hinge pin 5 is greater than the center distance from the front end face of the locking seat 13 to the hinge pin 5. That is, when the locking rod 4 rotates around the hinge pin 5, it will interfere with the rear bottom surface of the locking groove 15, while ensuring that the front end of the locking rod 4 can extend out of the locking seat 13 to press the blade root 91 of the blade 9.

[0032] The longitudinal section of the limiting stop shaft 2 is D-shaped, with the outer flat side wall of the limiting stop shaft 2 facing upwards, and the diameter of the arc-shaped outer wall of the limiting stop shaft 2 being equal to the groove width of the adjusting groove 14 on the snap-fit ​​seat 13; the adjusting bolt 3 is an internal hex bolt, with the head of the adjusting bolt 3 pressing against the upper end face of the snap-fit ​​seat 13 and the lower end inserted into the snap-fit ​​seat 13; a limiting sleeve 10 is fixed to the adjusting bolt 3, and the limiting sleeve 10 abuts against the upper bottom surface of the adjusting groove 14.

[0033] Working principle: This structure is a transfer fixture for laser hardening of steam turbine blades. The transfer fixture is mainly used to clamp steam turbine blades with a mold-type slot structure. Before clamping, the clamping seat 13 on the transfer fixture needs to match the clamping slot 92 on the steam turbine blade. If there is a difference in the size of the blade root 91, the position of the limit stop shaft 2 can be adjusted by rotating the adjusting bolt 3. The limit stop shaft 2 is the positioning reference of the blade 9.

[0034] When clamping blade 9, there are two methods. One is for heavier blades 9, where it is inconvenient to manually move them directly to the three-jaw chuck's transfer clamp. In this case, a forklift or its special lifting equipment can be used to lift blade 9, while simultaneously removing the limit stud 7 and pulling the push-pull rod 6 to rotate the locking rod 4. Figure 6 As shown, the front end of the locking rod 4 does not interfere with the entry and exit of the blade root 91 into the adapter clamp 13. Then, the blade root 91 is sleeved onto the adapter 13 from the lower end. Next, the push-pull rod 6 is pushed down, and the limit stud 7 is screwed and fixed on the connecting seat 12, so that the locking rod 4 is rotated and pressed onto the blade root 91. Figure 5 As shown;

[0035] Another method is for the lighter blade 9, where the lower end of the locking seat 13 can be rotated to the upper side, so that the limiting stop shaft 2 moves down, and the blade 9 can be installed into the connecting seat 12 from top to bottom. At the same time, the locking rod 4 is controlled in the same way to lock the blade root 91.

[0036] The embodiments described are illustrative of the invention and are not intended to limit the invention. Any person skilled in the art can modify the embodiments without departing from the spirit and scope of the invention; therefore, the scope of protection of the invention should be as set forth in the claims.

Claims

1. A transfer fixture for laser hardening of turbine blades, comprising a circular base (1), a clamping shaft (11) formed at the center of the rear end face of the base (1), a vertical rectangular connecting seat (12) formed on the front end face of the base (1), and a snap-fit ​​seat (13) with a fungus-shaped horizontal cross-section formed on the front end face of the connecting seat (12), characterized in that: The middle and upper parts of the snap-fit ​​seat (13) are formed with vertical adjustment grooves (14) that penetrate the two side walls of the snap-fit ​​seat (13). A horizontal limiting stop shaft (2) is inserted into the adjustment groove (14). The two ends of the limiting stop shaft (2) extend out of the two side walls of the snap-fit ​​seat (13) respectively, and a vertical adjusting bolt (3) is screwed into the middle. The adjusting bolt (3) is pivotally connected to the snap-fit ​​seat (13). The front end face of the middle and lower part of the locking seat (13) is formed with a locking groove (15) that penetrates the lower end face of the locking seat (13) and extends to the connecting seat (12). An oblique locking rod (4) is inserted into the locking groove (15). A horizontal hinge pin (5) is inserted into the middle and rear part of the locking rod (4). The two ends of the hinge pin (5) are respectively inserted and fixed on the locking seat (13). A vertical slot (41) is formed at the rear part of the locking rod (4). Oblique guide grooves (42) are respectively on the inner walls of both sides of the slot (41). A vertical guide hole that communicates with the locking groove (15) is formed on the upper end face of the connecting seat (12). (16) The upper end of the guide hole (16) is formed with a threaded hole (17); a push-pull rod (6) is inserted into the guide hole (16) of the connecting seat (12), and a hinged lug (61) is formed at the lower end of the push-pull rod (6). The lower end of the hinged lug (61) is inserted into the slot (41) of the locking rod (4) and a transverse guide pin (8) is inserted. The two ends of the guide pin (8) are respectively inserted into the guide groove (42) of the locking rod (4); a limit stud (7) is screwed into the threaded hole (17) of the connecting seat (12), and the lower end of the limit stud (7) and the upper end of the push-pull rod (6) are pivotally connected together.

2. The adapter fixture for laser quenching of turbine blades according to claim 1, characterized in that: The push-pull rod (6) is cylindrical, and the central axis of the push-pull rod (6) coincides with the central axis of the limiting stud (7); the upper end face of the push-pull rod (6) abuts against the lower end face of the limiting stud (7).

3. The adapter fixture for laser quenching of turbine blades according to claim 2, characterized in that: The diameter of the push-pull rod (6) is smaller than the diameter of the limiting stud (7). The upper end face of the limiting stud (7) is formed with a regular hexagonal countersunk hole (71). A reamed hole bolt (20) is inserted into the countersunk hole (71). The end of the reamed hole bolt (20) is screwed and fixed on the push-pull rod (6).

4. The adapter fixture for laser quenching of turbine blades according to claim 2, characterized in that: The diameter of the push-pull rod (6) is equal to the diameter of the guide hole (16) on the connector (12); The horizontal cross-section of the hinged lug (61) on the push-pull rod (6) is rectangular, and the length and width of the horizontal cross-section of the hinged lug (61) are both smaller than the diameter of the guide hole (16).

5. The adapter fixture for laser quenching of turbine blades according to claim 4, characterized in that: The width of the horizontal section of the hinged lug (61) is equal to the groove width of the slot (41) on the locking rod (4), and the diameter of the guide pin (8) on the hinged lug (61) is equal to the groove width of the guide groove (42) on the locking rod (4). The thickness of the locking rod (4) is equal to the opening of the locking groove (15) on the locking seat (13).

6. The adapter fixture for laser quenching of turbine blades according to claim 5, characterized in that: The center distance from the bottom surface of the lock groove (15) to the hinge pin (5) is greater than the center distance from the rear end of the lock rod (4) to the hinge pin (5); the center distance from the front end of the lock rod (4) to the hinge pin (5) is greater than the center distance from the front end of the snap-fit ​​seat (13) to the hinge pin (5).

7. The adapter fixture for laser quenching of turbine blades according to claim 1, characterized in that: The longitudinal section of the limiting stop shaft (2) is D-shaped, the outer side wall of the planar type on the limiting stop shaft (2) faces upward, and the diameter of the arc-shaped outer wall on the limiting stop shaft (2) is equal to the groove width of the adjusting groove (14) on the snap-fit ​​seat (13); The adjusting bolt (3) is an internal hex bolt. The head of the adjusting bolt (3) is pressed against the upper end face of the snap-fit ​​seat (13), and the lower end is inserted into the snap-fit ​​seat (13). A limit sleeve (10) is inserted and fixed on the adjusting bolt (3), and the limit sleeve (10) abuts against the upper bottom surface of the adjusting groove (14).

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