Positioning device and method for in-hole boring of movable guide vane and crank arm of water turbine

Abstract

A positioning device for in-boring pin holes of a movable guide vane and a crank arm of a water turbine comprises a pressing plate mechanism used for pressing the water inlet edge of the guide vane, the pressing plate mechanism comprises a first supporting body, a tensioning screw and a second supporting body which are installed on a supporting table, and the tensioning screw is in threaded connection with a first pressing plate; the at least two clamping mechanisms are used for clamping and fixing the guide vane shaft, each clamping mechanism comprises a third supporting body installed on the supporting table, and the third supporting body is in threaded connection with a second pressing plate through a tensioning screw; the positioning mechanism is used for limiting the relative position of the guide vane crank arm and the guide vane shaft, and the positioning mechanism comprises a fourth supporting body and a fifth supporting body which are installed on the supporting table. A series of tedious procedures such as bundling guide vane circle forming and laser positioning can be omitted, the labor time cost is saved, and the beneficial effects of being high in efficiency and high in universality are achieved.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing of a hydro-generator set, and in particular to a positioning device and method for boring pin holes of movable guide vanes and crank arms of a hydro-turbine. Background Art

[0002] In a hydro turbine unit, the guide vane structure is an important component. The guide vanes, guide vane arms and connecting rods are interconnected to form a set of guide vane structures. Each hydro turbine generator generally contains 16-24 guide vane structures. By controlling the opening and closing of the guide vane structure, the water flow guidance, cutoff and flow regulation functions are completed in a coordinated manner.

[0003] The guide vane and the guide vane arm are connected by two or three split keys, which transmit rotational torque to control the guide vane opening. The pin holes of these split keys consist of two semicircular holes, one located in the guide vane and the other in the guide vane arm. During assembly, the two semicircular holes must be strictly aligned, which requires extremely high machining precision.

[0004] In the existing technology, when machining the half-key pin holes on the guide vanes and guide vane crank arms, all movable guide vanes are assembled and bundled together until they are fully closed. After the crank arms are placed on the upper shaft, laser positioning is used to adjust the relative angle between the crank arms and the guide vanes. Vertical drilling and boring tools are then used to perform the drilling and boring operations in sequence. This process is complex, time-consuming, labor-intensive, costly, and inefficient. In actual production, it often fails to meet lead times. Summary of the Invention

[0005] In order to address the deficiencies in the prior art, the present invention provides a positioning device and method for boring pin holes in movable guide vanes and crank arms of a turbine. The present invention can eliminate a series of tedious processes such as bundling guide vanes into a circle and laser positioning, thereby saving labor time costs and having the advantages of high efficiency and strong versatility.

[0006] In order to achieve the above-mentioned object, the specific solution adopted by the present invention is: a positioning device for boring pin holes of movable guide vanes and crank arms of a hydraulic turbine, characterized by comprising: a support platform, on which a pressure plate mechanism, a positioning mechanism and at least two clamping mechanisms are provided; The pressure plate mechanism is used to press the water inlet edge of the guide vane, and the pressure plate mechanism includes a first support body and a second support body mounted on the support platform, the second support body is fixedly connected to a first pressure plate for pressing the water inlet edge against the first support body, and the first pressure plate is connected to the first support body through a tightening screw; At least two clamping mechanisms for clamping and fixing the guide vane shaft, the clamping mechanism comprising a third support body mounted on the support platform, the third support body being threadedly connected to a second pressing plate for pressing the guide vane shaft onto the third support body via a tightening screw; A positioning mechanism is used to limit the relative position of the guide vane arm and the guide vane shaft. The positioning mechanism includes a third pressure plate and a fourth support body and a fifth support body installed on the support platform. The fifth support body is fixedly connected to the third pressure plate. The third pressure plate is used to press the positioning pin on the guide vane arm onto the fourth support body.

[0007] As a further optimization of the positioning device for the above-mentioned turbine movable guide vane and the bored pin hole of the crank arm: the first support body includes a first base, on which a first support column is fixedly arranged, and a support protrusion is formed at the top of the first support column, and the support protrusion can be inserted into the long groove opened at the bottom of the water inlet edge of the guide vane.

[0008] As a further optimization of the positioning device for the above-mentioned turbine movable guide vane and the crank arm with the same boring pin hole: the first pressure plate is fixedly connected with a downwardly extending pressure plate protrusion, and the bottom of the pressure plate protrusion is provided with an arc surface, which can fit with the water inlet edge of the guide vane.

[0009] As a further optimization of the positioning device for the above-mentioned turbine movable guide vane and the crank arm with the same boring pin hole: three clamping mechanisms are provided, and the three clamping mechanisms are respectively used to clamp the shaft neck of the guide vane shaft and the parts of the guide vane shaft near the two ends.

[0010] As a further optimization of the positioning device for the above-mentioned turbine movable guide vane and the crank arm with the same boring pin hole: the clamping mechanism includes a third support body for supporting the guide vane shaft, the third support body is connected to the second pressure plate through two tightening screws, the second pressure plate, the third support body and the two tightening screws enclose an accommodating space for accommodating the guide vane shaft, and the two tightening screws cooperate with the locking nuts to enable the second pressure plate to press the guide vane shaft onto the third support body.

[0011] As a further optimization of the positioning device for the above-mentioned turbine movable guide vane and crank arm with the same boring pin hole: the upper end surface of the third support body is provided with a groove for placing the guide vane shaft, and the width of the groove gradually decreases from top to bottom.

[0012] As a further optimization of the positioning device for the above-mentioned turbine movable guide vane and the crank arm with the same boring pin hole: the third pressure plate is rectangular, the first end of the third pressure plate is fixedly set on the top of the fifth support body, the middle part of the third pressure plate is connected to the fourth support body through a tightening screw, and the second end of the third pressure plate is used to press the positioning pin onto the fourth support body.

[0013] As a further optimization of the positioning device for the above-mentioned turbine movable guide vane and the crank arm with the same boring pin hole: the fourth support body includes a second base fixedly mounted on the surface of the support platform and a second support column fixedly connected to the second base, and the height of the fourth support body is lower than the height of the fifth support body.

[0014] The present invention also provides a method for positioning a movable guide vane of a water turbine and a crank arm with a bored pin hole. Based on the above-mentioned tooling device for positioning a movable guide vane of a water turbine and a crank arm with a bored pin hole, the method comprises the following steps: The guide vane arm positioning ring is mounted on one end of the guide vane shaft, and a positioning pin is connected to the guide vane arm; placing the guide vane shaft on the third support body of the clamping mechanism; Rotate the guide vane to adjust the position of the water inlet edge until the water inlet edge falls on the first support body of the pressure plate mechanism; The first pressure plate is used to press the water inlet edge onto the first support body, the second pressure plate is used to press the guide vane shaft onto the third support body, and the third pressure plate is used to press the guide vane positioning pin onto the fourth support body of the positioning mechanism.

[0015] This device uses a pressure plate mechanism and a clamping mechanism to compress the guide vanes and clamp the guide vane shaft to secure the guide vanes. A positioning mechanism clamps the positioning pin to achieve coaxial positioning of the guide vanes and the guide vane arm. This device eliminates the need for tedious processes such as bundling the guide vanes into a circle and laser positioning, saving manpower and time and improving guide vane processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 yes Figure 1 Right view of; Figure 3 is a schematic structural diagram of the first support body; Figure 4 2 is a schematic structural diagram of the first pressing plate; Figure 5 It is a structural diagram of the clamping mechanism; Figure 6 It is a structural diagram of the positioning mechanism; Figure 7 This is a schematic diagram illustrating the location of the pin hole.

[0017] Description of the drawings: 1-pressure plate mechanism, 2-clamping mechanism, 3-positioning mechanism, 4-first support body, 5-first pressure plate, 6-second support body, 7-third support body, 8-second pressure plate, 9-third pressure plate, 10-fourth support body, 11-fifth support body, 12-tensioning screw, 13-locking nut, 14-support platform, 15-guide vane, 16-guide vane arm, 17-first base, 18-first support column, 19-support protrusion, 20-long groove, 21-pressure plate protrusion, 22-guide vane shaft, 23-groove, 24-positioning pin, 25-second base, 26-second support column. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Example 1

[0020] like Figure 1 As shown, a positioning device for boring pin holes of movable guide vanes and crank arms of a turbine comprises a support platform 14 on which a pressure plate mechanism 1, a positioning mechanism 3 and at least two clamping mechanisms 2 are provided.

[0021] The pressing plate mechanism 1 is arranged in the middle of the water inlet side of the guide vane 15. The pressing plate mechanism 1 uses a tightening screw 12 and a locking nut 13 to press the upper surface of the guide vane 15 so that the blade does not shake during the processing.

[0022] There are multiple clamping mechanisms 2, which are respectively clamped on the guide vane shaft 22 at both ends of the guide vane 15 to form a three-point distribution with the pressure plate mechanism 1. The clamping mechanism 2 includes a third support body 7 installed on the support platform 14. The third support body 7 is threadedly connected to the second pressure plate 8 for pressing the guide vane shaft 22 on the third support body 7 through the tightening screw 12. The clamping mechanism 2 and the pressure plate mechanism 1 cooperate to fix the guide vane 15 to ensure the dynamic stability of the guide vane 15 during high-speed boring processing.

[0023] The positioning mechanism 3 is used to limit the relative position of the guide vane crank arm 16 and the guide vane shaft 22. The positioning mechanism 3 includes a fourth support body 10 and a fifth support body 11 installed on the support platform 14. The fifth support body 11 is fixedly connected to the third pressure plate 9. The third pressure plate 9 is used to press the positioning pin 24 on the guide vane crank arm 16 onto the fourth support body 10, thereby achieving precise positioning of the guide vane crank arm 16 and the guide vane shaft 22. The positioning mechanism 3 cooperates with the pressure plate mechanism 1 and the clamping mechanism 2 to ensure the stability of the guide vane 15 during the processing and the coaxiality requirements of the guide vane crank arm 16.

[0024] When using this device to process the guide vane 15, it is only necessary to place the guide vane shaft 22 on the clamping mechanism 2, then adjust the locking nuts 13 of the pressure plate mechanism 1 and the clamping mechanism 2 so that the pressure plate mechanism 1 presses the guide vane 15, the clamping mechanism 2 clamps the guide vane shaft 22, and the positioning mechanism 3 clamps the positioning pin 24 of the guide vane crank arm 16, so that the guide vane shaft 22 and the guide vane crank arm 16 are in a coaxial position. Compared with traditional processes, this device does not require a series of tedious processes such as bundling the guide vanes into a circle and laser positioning, which can save manpower and time and improve the processing efficiency of the guide vanes.

[0025] After the guide vane 15 and the guide vane arm 16 are fixed, the process of determining the pin hole position is as follows.

[0026] First, a plane rectangular coordinate system is established with the journal center of the guide vane shaft 22 .

[0027] The device positioning utilizes the plane where the first pressure plate 5 is located, and the plane is based on the overlapping point on the water inlet side, l1=324.7, l2=24.6, r1=609.7, r2=600, and the coordinates of the overlapping point on the water inlet side are: x=-590.6527y=-105.4954.

[0028]

[0029] Secondly, the angle θ1 between the line connecting the water inlet overlap point and the axis of the guide vane shaft 22 and the x-axis is obtained:

[0030]

[0031] When the guide vane 15 is placed on the device, the distance from the profile to the horizontal plane is h2 = 327.1, and the distance from the head support point to the horizontal plane is h3 = 319.1 mm. Therefore, when the guide vane 15 is placed on the device, the angle θ2 between the line connecting the water inlet edge overlap point and the axis center of the guide vane shaft 22 and the horizontal plane is:

[0032]

[0033] The angle θ3 between the guide vane 15 reference line and the horizontal plane is:

[0034] θ3=θ2-θ1=22.909°

[0035] l3=680mm, the distance h4 from the center of the circular hole at the end of the connecting plate to the horizontal plane is:

[0036] h4=l3×sinθ5=161.62

[0037] The angle between the first pin hole and the centerline of the guide vane arm 16 is 18° when viewed counterclockwise from the centerline of the guide vane arm 16. The radius of the pin hole distribution circle is r3 = 82.5. A plane rectangular coordinate system is established with the center of the guide vane shaft 22 journal, with the positive X direction as the horizontal direction and the positive Y direction as the vertical direction. In this coordinate system, the coordinates X1 and Y1 of the first pin hole are:

[0038]

[0039] Looking down and rotating counterclockwise, the coordinates X2 and Y2 of the second pin hole are:

[0040]

[0041] Looking down and rotating counterclockwise, the coordinates X3 and Y3 of the third pin hole are:

[0042]

[0043] Example 2

[0044] This embodiment is an improvement on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 3 As shown, the first support body 4 includes a first base 17, which is fixed to the support platform 14 to provide stable support for the entire guide vane 15. A first support column 18 is fixedly connected to the first base 17, and a support protrusion 19 is provided on the top of the first support column 18. The support protrusion 19 can be precisely matched with the long groove at the bottom of the guide vane 15 to form a radial positioning reference, which effectively limits the radial displacement of the guide vane 15 during the processing process and ensures the coaxiality of the pin hole processing of the guide vane 15 and the guide vane arm 16.

[0045] Example 3

[0046] This embodiment is an improvement on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 4 As shown, the first pressure plate 5 is provided with a threaded hole, and one end of the first pressure plate 5 extends downward to form a pressure plate protrusion 21. The bottom of the pressure plate protrusion 21 is provided with an arc surface, which is in contact with the arc surface of the water inlet edge of the guide vane 15 to ensure that the guide vane 15 is evenly stressed and does not produce local deformation.

[0047] Example 4

[0048] This embodiment is an improvement on the basis of embodiment 1. Its main structure is the same as that of embodiment 1, and the improvement is that the guide vane shaft 22 extends asymmetrically from both ends of the guide vane 15, one side of which is the long axis side and the other side is the short axis side. The end of the long axis side is the journal of the guide vane shaft 22, and the clamping mechanism 2 is clamped at the journal of the guide vane shaft 22 and the part of the guide vane shaft 22 close to the two ends 15.

[0049] Example 5

[0050] This embodiment is an improvement on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 5As shown, the clamping mechanism 2 includes a third support body 7 for supporting the guide vane shaft. The third support body 7 is connected to the second pressure plate 8 by two tightening screws 12. The two tightening screws 12 are vertically upward and parallel. The second pressure plate 8, the third support body 7 and the two tightening screws 12 enclose an accommodating space for accommodating the guide vane shaft 22. The two tightening screws 12 cooperate with the locking nuts 13 to enable the third support body 7 and the second pressure plate 8 to clamp the guide vane shaft 22. When the locking nut 13 is tightened, the supporting surface of the third support body 7 and the clamping surface of the second pressure plate 8 jointly form a tight clamping of the guide vane shaft 22, ensuring that the guide vane shaft 22 remains stable during processing.

[0051] Example 6

[0052] This embodiment is an improvement on the basis of embodiment 5. Its main structure is the same as that of embodiment 5. The improvement is as follows: Figure 5 As shown, the upper end surface of the third support body 7 is provided with a groove 23 for accommodating the guide vane shaft 22. The width of the groove 23 is greater than the diameter of the guide vane shaft 22 to facilitate quick clamping and positioning. At the same time, the depth of the groove 23 is slightly less than the diameter of the guide vane shaft 22 to ensure that the guide vane shaft is partially exposed outside the groove in its natural state, facilitating effective pressing of the second pressing plate 8. The two side walls of the groove 23 are inclined, and the width of the groove 23 gradually decreases from top to bottom, thereby ensuring that the guide vane shaft 22 can slide into the bottom of the groove 23 along the inclined side walls, easily achieving positioning. This groove 23 structure not only ensures the initial positioning accuracy of the guide vane shaft 22, but also provides the necessary operating space for subsequent tightening and clamping, making the entire clamping process more convenient and reliable.

[0053] Example 7

[0054] This embodiment is an improvement on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 6 As shown, the third pressure plate 9 is rectangular, the first end of the third pressure plate 9 is fixedly arranged on the top of the fifth support body 11, the middle part of the third pressure plate 9 is connected to the fourth support body 10 through the tightening screw 12, and the second end of the third pressure plate 9 is used to press the positioning pin 24 onto the fourth support body 10. When the locking nut 13 is tightened, one end of the third pressure plate 9 and the fourth support body 10 form a tight clamping of the positioning pin 24, and at the same time, the other end of the third pressure plate 9 is stably supported by the fifth support body 11.

[0055] Example 8

[0056] This embodiment is an improvement on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 6As shown, the fourth support body 10 includes a second base 25 fixedly mounted on the surface of the support platform 14 and a second support column 26 fixedly connected to the second base 25. The height of the fourth support body 10 is lower than that of the fifth support body 11, and the height difference between the two is slightly smaller than the diameter of the positioning pin 24. This height difference enables the third pressure plate 9 to press the positioning pin 24 onto the fourth support body 10.

[0057] The present invention further provides a method for positioning a turbine movable guide vane and a crank arm with a pin hole bored therein. Based on the above-mentioned tooling device for positioning a turbine movable guide vane and a crank arm with a pin hole bored therein, the method includes S1 to S4.

[0058] S1. Sleeve the positioning ring of the guide vane arm 16 onto one end of the guide vane shaft 22 , and connect the positioning pin 24 to the guide vane arm 16 .

[0059] S2. Place the guide vane shaft 22 on the third support body 7 of the clamping mechanism 2.

[0060] S3 . Rotate the guide vane 15 to adjust the position of the water inlet edge until the water inlet edge falls on the first support body 4 of the pressure plate mechanism 1 .

[0061] S4. Use the first pressure plate 5 to press the water inlet edge onto the first support body 4, use the second pressure plate 8 to press the guide vane shaft 22 onto the third support body 7, and use the third pressure plate 9 to press the guide positioning pin 24 onto the fourth support body 10 of the positioning mechanism 3.

[0062] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A positioning device for boring pin holes of movable guide vanes and crank arms of a hydraulic turbine, characterized in that: include: A support platform (14), wherein a pressing plate mechanism (1), a positioning mechanism (3) and at least two clamping mechanisms (2) are provided on the support platform (14); The pressure plate mechanism (1) is used to press the water inlet edge of the guide vane (15), and the pressure plate mechanism (1) comprises a first support body (4) and a second support body (6) mounted on a support platform (14); the second support body (6) is fixedly connected to a first pressure plate (5) for pressing the water inlet edge onto the first support body (4), and the first pressure plate (5) is connected to the first support body (4) via a tensioning screw (12); At least two clamping mechanisms (2) for clamping and fixing the guide vane shaft, the clamping mechanism (2) comprising a third support body (7) mounted on a support platform (14), the third support body (7) being threadedly connected to a second pressing plate (8) for pressing the guide vane shaft (22) onto the third support body (7) via a tensioning screw (12); A positioning mechanism (3) is used to limit the relative position of the guide vane arm (16) and the guide vane shaft (22). The positioning mechanism (3) includes a fourth support body (10) and a fifth support body (11) mounted on a support platform (14). The fifth support body (11) is fixedly connected to a third pressure plate (9). The third pressure plate (9) is used to press a positioning pin (24) on the guide vane arm (16) onto the fourth support body (10).

2. A hydraulic turbine movable guide vane and crank arm boring pin hole positioning fixture according to claim 1, characterized in that: The first support body (4) includes a first base (17), a first support column (18) is fixedly connected to the first base (17), and a support protrusion (19) is provided at the top of the first support column (18), and the support protrusion (19) can be inserted into a long groove (20) provided at the bottom of the water inlet side of the guide vane (15).

3. A hydraulic turbine movable guide vane and crank arm boring pin hole positioning fixture according to claim 1, characterized in that: The first pressure plate (5) is fixedly connected to a downwardly extending pressure plate protrusion (21), and the bottom of the pressure plate protrusion (21) is provided with an arc surface, which can fit with the water inlet edge of the guide vane (15).

4. A hydraulic turbine movable guide vane and crank arm boring pin hole positioning fixture according to claim 1, characterized in that: Three clamping mechanisms (2) are provided, and the three clamping mechanisms (2) are used to clamp the journal of the guide vane shaft (22) and the parts of the guide vane shaft (22) close to both ends, respectively.

5. The hydraulic turbine movable guide vane and crank arm boring pin hole positioning fixture according to claim 1, characterized in that: The clamping mechanism (2) includes a third support body (7) for supporting the guide vane shaft (22); the third support body (7) is connected to the second pressure plate (8) through two tightening screws (12); the second pressure plate (8), the third support body (7) and the two tightening screws (12) enclose an accommodating space for accommodating the guide vane shaft (22); the two tightening screws (12) cooperate with the locking nuts (13) to enable the second pressure plate (8) to press the guide vane shaft (22) onto the third support body (7).

6. A hydraulic turbine movable guide vane and crank arm boring pin hole positioning fixture according to claim 5, characterized in that: The upper end surface of the third support body (7) is provided with a groove (23) for accommodating the guide vane shaft (22), and the width of the groove (23) gradually decreases from top to bottom.

7. A hydraulic turbine movable guide vane and crank arm boring pin hole positioning fixture according to claim 1, characterized in that: The third pressing plate (9) is rectangular, the first end of the third pressing plate (9) is fixedly arranged on the top of the fifth support body (11), the middle part of the third pressing plate (9) is connected to the fourth support body (10) through a tightening screw (12), and the second end of the third pressing plate (9) is used to press the positioning pin (24) onto the fourth support body (10).

8. The hydraulic turbine movable guide vane and crank arm boring pin hole positioning fixture according to claim 1, characterized in that: The fourth support body (10) comprises a second base (25) fixedly mounted on the surface of the support platform (14) and a second support column (26) fixedly connected to the second base (25); the height of the fourth support body (6) is lower than the height of the fifth support body (11).

9. A method for positioning a turbine guide vane and a crank arm with a bored pin hole, characterized in that: Based on a hydraulic turbine movable guide vane and crank arm co-boring pin hole positioning fixture as described in any one of claims 1 to 8, the method comprises the following steps: sleeve a positioning ring of the guide vane crank arm (16) on one end of the guide vane shaft (22), and connect a positioning pin (24) to the guide vane crank arm (16); placing the guide vane shaft (22) on the third support body (7) of the clamping mechanism (2); Rotating the guide vane (15) to adjust the position of the water inlet edge until the water inlet edge falls on the first support body (4) of the pressure plate mechanism (1); The first pressure plate (5) is used to press the water inlet edge onto the first support body (4), the second pressure plate (8) is used to press the guide vane shaft (22) onto the third support body (7), and the third pressure plate (9) is used to press the guide vane positioning pin (24) onto the fourth support body (10) of the positioning mechanism (3).

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